Abdelfatah Abomohra

Abdelfatah Abomohra

Tanta University

H-index: 49

Africa-Egypt

Abdelfatah Abomohra Information

University

Tanta University

Position

Botany and Microbiology Department Faculty of Science .

Citations(all)

7366

Citations(since 2020)

6872

Cited By

2413

hIndex(all)

49

hIndex(since 2020)

48

i10Index(all)

134

i10Index(since 2020)

132

Email

University Profile Page

Tanta University

Abdelfatah Abomohra Skills & Research Interests

Phycology

Environmental Engineering

Biofuel

Waste recycling

Top articles of Abdelfatah Abomohra

Thermophilic β-mannanases from bacteria: production, resources, structural features and bioengineering strategies

β-mannanases are pivotal enzymes that cleave the mannan backbone to release short chain mannooligosaccharides, which have tremendous biotechnological applications including food/feed, prebiotics and biofuel production. Due to the high temperature conditions in many industrial applications, thermophilic mannanases seem to have great potential to overcome the thermal impediments. Thus, structural analysis of thermostable β-mannanases is extremely important, as it could open up new avenues for genetic engineering, and protein engineering of these enzymes with enhanced properties and catalytic efficiencies. Under this scope, the present review provides a state-of-the-art discussion on the thermophilic β-mannanases from bacterial origin, their production, engineering and structural characterization. It covers broad insights into various molecular biology techniques such as gene mutagenesis …

Authors

Beenish Sadaqat,Mudasir A Dar,Chong Sha,Abdelfatah Abomohra,Weilan Shao,Yang-Chun Yong

Published Date

2024/4

Sustainable valorization of waste glycerol into bioethanol and biodiesel through biocircular approaches: A review

Liquid biofuels like biodiesel and bioethanol are crucial in the transition to low-carbon and high-energy alternatives to fossil fuels. One significant by-product of biodiesel production is glycerol, which accounts for about 10% of the total conversion output. While waste glycerol poses challenges due to its impurities and contaminants, it also holds potential as a metabolic resource for essential cellular components in microorganisms. Crude glycerol production is reviewed, highlighting relevance in current biodiesel technologies and its biochemical composition. To efficiently utilize waste glycerol, co-valorization with low-cost substrates through biocircular platforms using various microorganisms or insects for second and third-generation oxy-biofuels has been explored. Among these, the black soldier fly larvae have demonstrated higher competitiveness for lipid contents (35–43%), making them a promising organism for …

Authors

Mahdy Elsayed,Mohamed Eraky,Ahmed I Osman,Jing Wang,Mohamed Farghali,Ahmed K Rashwan,Ibrahim H Yacoub,Dieter Hanelt,Abdelfatah Abomohra

Published Date

2023/12/1

Lipid-rich particles of processed food waste for microalgae harvest through lipid-enriched floating biomat formation

Food waste was collected from the campus canteen and lipid-rich particles (LRP) phase was evaluated to harvest Tetradesmus obliquus. Box-Behnken design showed the highest harvest efficiency (HE) of 84.69 % in run#1 (LRP = 30 %; initial OD680 = 1.75; and harvest time = 6 h). Numerical optimization ramps suggested 24.15 % (v/v) LRP ratio, initial OD680 3.00, and harvest time 3.82 h for maximum HE. Two flocs were observed, a precipitate at the bottom (B-Floc) and a floating biomat (F-Floc). Experimental results showed HE of 88.3 %, with 67 % and 33 % of the harvested biomass forming F-Floc and B-Floc, respectively. Pre-heating of LRP in a boiling water bath for 10 min (HFB-T10) promoted F-Floc proportion up to 91.6 %. In addition, HFB-T10 showed the highest FAMEs yield of 11.17 g/L of the total used volume, which was significantly higher than that of the centrifuged cells and heat-untreated biomat …

Authors

Javier Garrido-Romero,Alston Bernard D'Souza,Dieter Hanelt,Abdelfatah Abomohra

Journal

Bioresource Technology

Published Date

2024/2/1

Integrated municipal wastewater treatment and lipid accumulation by a self-flocculating/floating microalga Limnothrix sp.

The present study evaluated the growth, self-flocculation, lipid content, and pollutants removal by Limnothrix sp. BASMWW-9 isolated from municipal wastewater treatment system and cultivated in municipal wastewater. The biomass yield and lipid content after 6 days of cultivation were 1.07 g dw/L and 27.34 %dw, respectively. In addition, its self-flocculating ability reached up to 90 % after harvesting time of 180 min. Moreover, COD, NH3-N, TN, and TP removal efficiencies were 71.65 %, 81.89 %, 74.64 %, and 80.16 %, respectively. The self-flocculation performance of Limnothrix sp. was greatly associated to its morphology and production of extracellular polymeric substances (EPS), with significant positive impact of the high calcium and magnesium content in municipal wastewater. Interestingly, blue light irradiation during harvest enhanced the aggregation and floc formation as a floating biomat, which was …

Authors

Song-Fang Han,Wenbiao Jin,Fanqi Qu,Dieter Hanelt,Abdelfatah Abomohra

Journal

Bioresource Technology

Published Date

2024/2/1

A comprehensive review on the intricate processes involved in algae pyrolysis mechanism and possible migration of undesirable chemical elements

In recent times, algae have been potentially emerged as a viable third generation feedstock for biofuels due to its renewable, environmentally friendly and sustainable characteristics. Pyrolysis, as a promising thermochemical conversion method, has been extensively researched, yet the complex processes involved in the mechanism of algal pyrolysis have not been fully explored. The complex composition and structure of algae, primarily consisting of proteins, lipids, carbohydrates, and various inorganic elements, are known to add diversity and complexity to the pyrolysis process. These components have been found to significantly impact the pyrolysis process and may lead to environmental hazards. In this paper, bibliometric analysis is employed to comprehensively review and analyze contemporary research articles focused on algae pyrolysis. The mechanisms involved in the pyrolysis of primary constituents of …

Authors

Weiwei Shen,Sirong He,Mao Mu,Bin Cao,Shuang Wang,Salman Raza Naqvi,Dieter Hanelt,Abdelfatah Abomohra

Published Date

2024/1/18

Valorization of floral foam waste via pyrolysis optimization for enhanced phenols recovery

Utilization of phenol formaldehyde foams is becoming increasingly widespread, especially in floral bouquets, generating toxic microplastics in the environment. The present study evaluated phenols recovery from floral foam waste (FFW) of floral bouquets through optimization of pyrolysis conditions. Compared to the biomass portion in the floral bouquet, FFW showed 55.1% higher carbon content, 56.9% lower nitrogen content, and 44.6% lower oxygen content, with the highest recorded calorific value of 27.43 MJ kg−1. Thermogravimetric analysis showed the relative thermal stability of FFW with gradual weight loss and numerous small peaks at 70 °C (representing short chain volatiles such as formaldehyde and phenol), 450 and 570 °C (due to phenolic and aromatic products release), indicating the richness of FFW with phenolic compounds. Optimization of pyrolysis conditions showed the highest significant …

Authors

Reham Ebaid,Qingyuan Wang,Shah Faisal,Li Li,Abdelfatah Abomohra

Journal

Chemosphere

Published Date

2023/1/1

Response surface optimization of product yields and biofuel quality during fast hydrothermal liquefaction of a highly CO2-tolerant microalgae

The effects of biochemical components and processing variables (e.g., temperatures, solid-liquid ratio, ethanol concentration, and time) during fast hydrothermal liquefaction of a highly CO2-tolerant microalgae (Micractinium sp.) on the product yields and biofuel quality were explored using response surface methodology coupled with central composite design. Results showed that the maximum bio-oil yield (51.4 %) was obtained at 321 °C for 49 min at ethanol concentration of 75 % and solid-liquid ratio of 15.3 %. Among different studied parameters, ethanol concentration showed the highest significant impact on the bio-oil yield due to the low P-value and high F-value in ANOVA analysis. Furthermore, the chemical compositions of bio-oils were determined, which showed that the increase of ethanol concentration in the solvent not only increased the bio-oil yield but also promoted the bio-oil quality by reduction of …

Authors

Bin Cao,Shuanhu Hu,Kai Zhu,Cheng Pan,Fatma Marrakchi,Jun Ni,Chuan Yuan,Lili Qian,Hao Chen,Jianping Yuan,Abdelfatah Abomohra,Pietro Bartocci,Francesco Fantozzi,Shuang Wang

Journal

Science of The Total Environment

Published Date

2023/2/20

Optimization of biomass and fatty acid productivity of Desmodesmus intermedius as a promising microalga for biodiesel production

The present study aimed to optimize the culture conditions for algal growth and lipid production of Desmodesmus intermedius. Different environmental factors including nitrogen content, salinity, kinetin hormone, vitamin B12, and light intensity were applied individually or in combination using Plackett–Burman statistical experimental design. In addition, the impact of optimized conditions on fatty acids profile and biodiesel quality was studied. Results revealed that the maximum lipid and biomass production for individual study optimization was recorded using 125 mg/L sodium nitrate, 12.5 mg/L sodium chloride, 10−7 mol/L kinetin, and 10−2 mg/L vitamin B12, at 4500 lux. In addition, Plackett-Burman model revealed that combination of sodium nitrate (125 mg/L), sodium chloride (25 mg/L), Kinetin hormone (0 mol/L), vitamin B12 (0 mg/L), and Light intensity (4500 Lux) resulted in maximum lipid productivity. The overall …

Authors

Mostafa M El-Sheekh,Hamed M Eladel,Abd El-Fatah Abomohra,Mohamed G Battah,Soha A Mohamed

Journal

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects

Published Date

2023/6/1

Holistic lignocellulosic biorefinery approach for dual production of bioethanol and xylonic acid coupled with efficient dye removal

The complete valorization of lignocellulosic biomass (LCB) to valuable bio-products with one-step fractionation is still challenging. This study represents sustainable waste-free biorefinery routes for efficient fractionation of LCB, employing a novel pretreatment method using hydrotropic p–toluenesulfonic acid (TsOH) mixed with pentanol. The potential of LCB pretreatment using TsOH/pentanol reagent as lignin absorbent with co-production of bioethanol and xylonic acid was investigated. Biomass pretreatment at 120 °C for 40 min with 20% TsOH dosage was the optimal condition that significantly dissolved more than 88.2% of lignin and 95.1% of hemicellulose in the biphasic phase, while 95.6% of cellulose was retained in the solid phase. Further fermentation of cellulose-rich fraction using Saccharomyces cerevisiae resulted in 225 g kg−1 bioethanol yield. In addition, xylose-rich phase was converted into xylonic …

Authors

Meysam Madadi,Mahdy Elsayed,Guojie Song,Mahmoud M Bakr,Yuanhang Qin,Fubao Sun,Abdelfatah Abomohra

Published Date

2023/10/1

A comparative life cycle assessment on recycled concrete aggregates modified by accelerated carbonation treatment and traditional methods

Recycling of construction and demolition wastes contributes to achieve carbon summit and carbon neutrality early in the construction industry. Accelerated carbonation is a promising new technology for enhancing the properties of recycled concrete aggregates (RCAs) as well as mitigating global warming. This study performed a comparative life cycle assessment on RCAs modified by accelerated carbonation treatment and traditional methods. The effect of different treatment methods on environmental impacts of concrete was evaluated. The key contributors of environmental impacts for concrete incorporating carbonated RCAs were identified. Moreover, a sensitivity analysis on the transport distance of concrete incorporating carbonated RCAs was conducted. Results demonstrated that incorporating carbonated RCAs could significantly reduce the energy demand, environmental impacts and environmental cost …

Authors

Yunhui Pu,Lang Li,Xiaoshuang Shi,Qingyuan Wang,Abdelfatah Abomohra

Journal

Waste Management

Published Date

2023/12/1

Opening the Algal Gateway

Microalgae and seaweeds have been discussed as a promise of bolstering the blue economy and green technologies, potentially emerging as a primary future source for food, animal feed, and biofuel. Additionally, they are seen as a naturally sustainable reservoir of bioactive compounds, described for the first time in this book as “phycochemicals”, possessing a wide array of applications for the betterment of humanity. Despite these hopeful prospects, the reality presents a different picture, where many of the established production facilities, particularly in Europe, remain modest in scale, and the sector as a whole is still in its developmental stages. The question arises, why this is still the case considering the vast amount of research conducted over decades? Extraction of valuable compounds from algae through integrated biorefinery approach could offer a solution to this quandary, creating a resource-efficient …

Authors

Stephan Ende,Abdelfatah Abomohra

Published Date

2023/12/1

Evaluation of bio-oil/biodiesel production from co-pyrolysis of corn straw and natural hair: A new insight towards energy recovery and waste biorefinery

The present study evaluated the total energy output and economic feasibility of biodiesel production coupled with value-added nitrogen-containing compounds (NCCs) through co-pyrolysis of low- and high-protein biowaste. Corn straw (CS) and human hair waste (HW) were used at different blend ratios of 0%, 25%, 50%, 75%, and 100%, w/w. Individual pyrolysis of HW showed 20.7% higher bio-oil yield than CS due to higher volatiles in HW, while co-pyrolysis resulted in synergistic action which enhanced both bio-oil yield with higher fatty acids/esters proportion. The highest recorded bio-oil yield was 46.3% using 75% HW blend ratio, which showed insignificant difference with that of HW. In addition, co-pyrolysis resulted in reduction of NCCs by 13.7% comparing to HW, with simultaneous enhancement of fatty acids and esters contents by 67.8% and 13.2%, respectively. Therefore, transesterification of co-pyrolyzed …

Authors

Min Xiong,Jin Huang,Xinrui He,Zhihui Zhou,Xiangjiang Qu,Shah Faisal,Abdelfatah Abomohra

Journal

Fuel

Published Date

2023/1/1

Integrated route of fast hydrothermal liquefaction of microalgae and sludge by recycling the waste aqueous phase for microalgal growth

In this study, waste aqueous phase after hydrothermal of sludge was used to cultivate the green microalga Chlorella sp. Results showed that waste aqueous phase can be used as a medium for Chlorella sp, with nitrogen and phosphorus removal efficiency of more than 90 %. At the same time, it was found that the introduction of CO2 during microalgal cultivation can effectively promote the growth of Chlorella sp and increase the lipid content respectively, comparing to the control. Further, based on response surface methodology, the optimal cultivation conditions of Chlorella sp were 5 % CO2, BG-11/SAP = 1:1 mixed medium and growth for 8 days. Chlorella sp was cultivated under the optimal aforementioned conditions followed by hydrothermal liquefaction, then the differences between the bio-oil and aqueous phase obtained by fast hydrothermal liquefaction and hydrothermal liquefaction were compared. This …

Authors

Chuan Yuan,Shuang Zhao,Jun Ni,Ying He,Bin Cao,Yamin Hu,Shuang Wang,Lili Qian,Abdelfatah Abomohra

Journal

Fuel

Published Date

2023/2/15

Multivariate Analysis of Heavy Metals and Human Health Risk Implications Associated with Fish Consumption from the Yangtze River in Zhenjiang City, China

The purpose of this study was to analyze levels of heavy metals and human health risk implications associated with fish consumption from the Yangtze River. A total of 60 fish muscles were taken from six different fish species—Hypophthalmichthys molitrix, Ctenopharyngodon idellus, Blicca bjoerkna, Mylopharyngodon piceus, Carassius carassius and Pelteobagrus fulvidraco—and digested using standard protocols. Contents of lead (Pb), cadmium (Cd), zinc (Zn), aluminum (Al) cobalt (Co), manganese (Mn), chromium (Cr), and copper (Cu), were analyzed using an Atomic Absorption Spectroscophotometer ((ZEEnit 700 P Zeeman)). Based on consumer health risk indicators, the health implications to children and adults upon consuming the analyzed fish species were assessed. Findings revealed that Zn recorded the highest mean concentration of 9.87 µg/g in Carassius carassius followed by Mn (7.97 µg/g) in Pelteobagrus fulvidraco, Cu (2.07 µg/g) in Mylopharyngodon piceus, Pb (1.04 µg/g) in Hypophthalmichthys molitrix, Cr (0.63 µg/g) in Hypophthalmichthys molitrix, Cd (0.19 µg/g) in Blicca bjoerkna and Ni (0.16 µg/g) (w/w) in Pelteobagrus fulvidraco. In addition, the health risk assessments revealed that children are at heightened non-carcinogenic risk for Pb, Cd, and Co upon consuming the examined fish species.

Authors

Peter Kaba,Sato Shushi,Eric Gyimah,Mansuur Husein,Abdelfatah Abomohra

Journal

Water

Published Date

2023/5/24

Recent Advances in Seaweed Biorefineries and Assessment of Their Potential for Carbon Capture and Storage

Seaweeds are among the most important biomass feedstocks for the production of third-generation biofuels. They are also efficient in carbon sequestration during growth and produce a variety of high-value chemicals. Given these characteristics together with the relatively high carbohydrate content, seaweeds have been discussed as an ideal means for CO2 capture and biofuel production. Though third-generation biofuels have emerged as some of the best alternatives to fossil fuels, there is currently no large-scale production or mainstream use of such liquid fuels due to the many technical challenges and high production costs. The present study describes the concept of coastal marine biorefineries as the most cost-effective and sustainable approach for biofuel production from seaweeds, as well as atmospheric carbon capture and storage (CCS). The suggested refinery system makes use of marine resources, namely seawater, seaweed, and marine microorganisms. Firstly, extensive screening of the current literature was performed to determine which technologies would enable the emergence of such a novel biorefinery system and its merits over conventional refineries. Secondly, the study investigates various scenarios assessing the potential of seaweeds as a means of carbon sequestration. We demonstrate that the removal of 100 Gigatons of excess CO2 using seaweed farms can be achieved in around 4 months to less than 12 years depending on the area under cultivation and the seaweed species. The total bioethanol that could be generated from the harvested biomass is around 8 trillion litres. In addition, high-value chemicals (HVC …

Authors

Katherine G Johnston,Abdelfatah Abomohra,Christopher E French,Abdelrahman S Zaky

Published Date

2023/9/1

Catalyst in Action

Algae exhibit distinguishing potential of producing various products from fuels to wide range of value-added products, described in the present book as phycochemicals. Few decades of research analyzed several pathways of converting microalgal biomass into bioproducts. The product conversion efficiency, sustainability, and economics of the production processes depend on the type of reactions opted and catalyst used for producing the targeted product. Catalyst plays vital role in overall economics and yield of the target product. For biofuel production, chemical and biological catalysts were extensively researched. The inherent disadvantages of homogeneous catalysts include tough separation from the reaction system and thermal instability which increased the heterogeneous catalyst applications. On the other hand, green catalysts are increasingly attractive that are mainly made from biomass, especially …

Authors

Sivakumar Esakkimuthu,Shuang Wang,Abdelfatah Abomohra

Published Date

2023/12/1

New microalgae media formulated with completely recycled phosphorus originating from agricultural sidestreams

This study investigated the impact of struvite as a sustainable phosphorus source on the growth and phycocyanin production by the blue-green alga Arthrospira platensis. Three modified growth media were compared to the typical SAG-spirul culture media. CS(+) refers to the completely recycled struvite from bovine urine as a phosphate source, while S(-) and S(+) refer to commercially available struvite as a phosphate source. On media with (+), a pre-treatment was conducted to evaporate NH4, as it negatively affects cell growth and functions of the photosynthetic apparatus at high concentrations, and to release phosphate due to the low solubility of struvite in water. For each medium, three cultures were cultivated in Erlenmeyer flasks for a duration of 42 days. Results showed that no statistically significant negative effect of struvite was found on the growth rates. However, C-phycocyanin (CPC-P) in CS(+) and S …

Authors

Albert S Beyer,Jasmin Meier,Marina Jiménez-Muñoz,Raphael Meixner,Stephan SW Ende,Abdelfatah Abomohra,Joachim Henjes

Journal

Journal of Applied Phycology

Published Date

2023/12

Maximizing the energy recovery from rice straw through two-step conversion using eggshell-catalytic pyrolysis followed by enhanced anaerobic digestion using calcium-rich biochar

Anaerobic digestion of lignocelluloses for biogas production is greatly restricted by the poor biomass degradability. Herein, a novel approach is suggested to enhance the energy recovery from rice straw through a two-step conversion using eggshell-based catalytic pyrolysis followed by biochar-based anaerobic co-digestion. Pyrolysis with eggshell significantly enhanced the crude bio-oil yield by 4.6 %. Anaerobic digestion of rice straw using 4 g L−1 of rice straw biochar (RB) showed the highest recorded biogas yield of 503.7 L kg−1 VS, with 268.6 L kg−1 VS biomethane yield. However, 4 g L−1 of calcium-enriched eggshell rice straw biochar (ERB) enhanced the biomethane yield to 281.8 L kg−1 VS, which represented 95.6 % higher than the control. It was attributed to enhancement of biomethanation, which resulted in 74.5 % maximum recorded biomethane content at the 7th day of anaerobic digestion. Microbial …

Authors

Shah Faisal,Reham Ebaid,Min Xiong,Jin Huang,Qingyuan Wang,Mohamed El-Hefnawy,Abdelfatah Abomohra

Journal

Science of The Total Environment

Published Date

2023/2/1

A mechanism study of methylene blue adsorption on seaweed biomass derived carbon: From macroscopic to microscopic scale

Biomass based active adsorbent can be prepared by activation process to adsorb dyes. In this study, using macroalgae as raw material, the biomass based activated carbon material was prepared by NaOH activation method to adsorb methylene blue. The activated adsorbent with high specific surface area (1238.491 m2 g−1) was characterized by BET, XRD, FTIR and XPS. The effects of impregnation ratio, amount of adsorbent, pH and contact time on the adsorption activity of biochar on MB were evaluated. The adsorption kinetics, molecular dynamics and density functional theory were discussed. The maximum MB removal efficiency of SWAC reached 98.56 % at 30 °C and pH = 5 which is due to its large specific surface area and mesoporous slit structure. MD simulation shows that MB molecules were adsorbed on carbon layer through face-to-face stacking. DFT calculation and subsequent electron structure …

Authors

Ding Jiang,Hongping Li,Xiaoxue Cheng,Qifan Ling,Hao Chen,Bahram Barati,Quanfeng Yao,Abdelfatah Abomohra,Xun Hu,Pietro Bartocci,Shuang Wang

Journal

Process Safety and Environmental Protection

Published Date

2023/4/1

A closed-loop approach for enhanced biodiesel recovery from rapeseed biodiesel-based byproducts through integrated glycerol recycling by black soldier fly larvae

The present study evaluated an innovative zero-waste approach for efficient recycling of byproducts from rapeseed-based biodiesel industry including lipid-free rapeseed cake (RSC) and waste glycerol by black soldier fly larvae (BSFL). RSC showed high organic matter and protein contents of 92.7 dw% and 32.1 dw%, respectively. Therefore, it was utilized as the main feed source for BSFL rearing, while waste glycerol was supplemented at different concentrations (0–10%, w/w). Application of 5.0% waste glycerol significantly enhanced larval biomass gain rate and areal productivity by 13.0% and 17.2%, respectively, over the control. Interestingly, lipid content also increased by 25.9% over the control. The study suggested a synergistic action in the mixture, where RSC is digested to achieve the growth and development, while waste glycerol can be integrated directly into fatty acid biosynthesis pathway to …

Authors

Adel W Almutairi,Abdelfatah Abomohra,Mahdy Elsayed

Journal

Journal of Cleaner Production

Published Date

2023/7/10

Bioenergy production from swine wastewater based on a combined process of anaerobic dynamic membrane reactor and microalgae cultivation: Feasibility and performance

Enhanced methane production and sustainable reduction of pollutants from anaerobic digestate are crucial for swine wastewater treatment. In this study, anaerobic dynamic membrane bioreactor (AnDMBR) was introduced to enhance methane production, then microalgae were cultivated on the digestate for nutrients recovery and lipid production. Results showed that pollutants can be effectively removed under various hydraulic retention time (HRT) conditions during long-term operation. Methanogenesis was enhanced with the reduction of HRT from 20 days to 10 days (0.23 L-CH4/g-CODremoved), but inhibited by shortening HRT to 5 days (0.09 L-CH4/g-CODremoved). Ammonia and phosphate in the digestate were effectively removed after microalgae cultivation. In addition, the highest microalgal biomass and lipid productivity (1.7 g/L and 17.5 mg/(L·d), respectively) were obtained using digestate ratio of 20 …

Authors

Jialing Tang,Hao Yang,Yunhui Pu,Yisong Hu,Xiangjiang Qu,Si Chen,Xiaochang C Wang,Huu Hao Ngo,Yuyou Li,Abdelfatah Abomohra

Journal

Science of The Total Environment

Published Date

2023/11/15

Value-added Products from Algae: Phycochemical Production and Applications

This book provides a comprehensive overview of value-added products from algae, presenting the fundamentals of algal cultivation, metabolism, harvest, and cellular pathways of phycochemicals biosynthesis. It offers sufficient details for both experts and non-experts to grasp the recent progress in this field. The book also discusses new phycochemicals and advancements in technology development, from separation to scale-up commercialization. Divided into 18 chapters, the book begins with an introduction to the value of algae as a renewable resource, followed by an authoritative overview of topics such as algae cultivation systems, harvesting techniques, phycochemical analysis, artificial intelligence in phytochemical recognition, and bioprocess engineering. Additional chapters cover various aspects of algal biotechnology, including biorefinery technology, biofuel-integrated routes, and the use of wastewater for algal growth. The book also explores high throughput screening methods for microalgae-based phycochemicals and examines the catalytic processes involved in algal bioprocessing. Cutting-edge topics such as omics approaches for algal applications, algal-based biopolymers, diatom nanostructured biosilica, and the potential of seaweeds in methane emission mitigation, are also explored. In this book, readers will discover the recent technological applications of algae in aquaculture and will find a case study on the functional food potential of Spirulina. Recognizing the importance of legislation and biosecurity in the field, the last chapter of the book addresses the regulatory frameworks and biosecurity measures necessary for the …

Authors

Abdelfatah Abomohra,Stephan Ende

Published Date

2023/12/1

Microalgae cultivation using municipal wastewater and anaerobic membrane effluent: Lipid production and nutrient removal

Microalgae cultivation using wastewater is a combined process for pollutant removal and lipid production that has been widely studied in recent years. In this study, the effects of anaerobic membrane effluent (AME) and municipal wastewater (MW) ratios on microalgae growth and pollutant removal processes were investigated, and the lipid production properties were also explored. Results show that microalgae can grow in all AME/WW ratios, and a 40% AME content is the optimal condition for microalgal biomass accumulation (52.9 mg/L· d) and lipid production (0.378 g/L). Higher AME addition would inhibit microalgae growth. In addition, high ammonia (approximately 97%) and phosphate (around 90%) removal efficiencies can be achieved in all AME/WW ratio conditions, while the total nitrogen removal efficiencies decreased with the addition of AME. Total nitrogen and phosphate are the limiting factors in treating water to meet the requirements of the integrated wastewater discharge standard. This study provided a new method for anaerobic digestion and municipal wastewater treatment and also realized green energy production based on the sustainable development principles.

Authors

Jialing Tang,Xiangjiang Qu,Si Chen,Yunhui Pu,Xinrui He,Zhihui Zhou,Huijun Wang,Ni Jin,Jin Huang,Faisal Shah,Yisong Hu,Abdelfatah Abomohra

Journal

Water

Published Date

2023/1

Algal biotechnology: Current trends and nanotechnology prospective

Algae biotechnology is an ever-expanding field of research that aims to use the biological properties of algae to develop products and solutions for diverse sectors, from food and energy to medicines and cosmetics. Algae are considered highly versatile and sustainable organisms, as they are able to carry out photosynthesis and grow quickly in different environments, in addition to producing bioactive compounds with interesting properties.In this context, nanotechnology has played an important role in algae biotechnology, allowing the development of new technologies and products with greater efficiency and precision. Nanotechnology involves the manipulation and control of materials at the nanometer scale, which allows the creation of new structures, devices, and systems with unique and promising properties.

Authors

Leonel Pereira,Gehan Ismail,Abdelfatah Abomohra

Journal

Frontiers in Marine Science

Published Date

2023/3/29

Freshwater microalgae-based wastewater treatment under abiotic.

AIMS Environmental Science, 10 (4): 504–515. DOI: 10.3934/environsci. 2023028 Received: 12 May 2023 Revised: 07 September 2023 Accepted: 10 September 2023 Published: 15 September 2023 http://www. aimspress. com/journal/environmental

Authors

Adel I Alalawy,Yang Yang,Fahad M Almutairi,Haddad A El Rabey,Mohammed A Al-Duais,Abdelfatah Abomohra,El-Sayed Salama

Journal

AIMS Environmental Science

Published Date

2023/7/1

Chemical process of multiphase system in lignin-biochar co-pyrolysis for enhanced phenol recovery

Carbon materials prepared by biomass pyrolysis have been studied for conversion of lignin into phenols. In this study, the control mechanism of free radicals on phenolic products selectivity was studied using guaiacol as a model chemical. The results showed that gaseous radicals or carbon-centered radicals of carbon materials could promote phenols formation through different mechanisms. In gas-phase system, the selectivity of phenols was mainly controlled by methyl radicals which led to a theoretical selectivity of phenols lower than 50%. In the heterogeneous system, methyl radicals and phenolic radicals were easily and rapidly adsorbed on the carbon edge sites. The o-hydroxyphenoxy radical was the key intermediate and was firstly absorbed on the carbon center radical sites where phenols produced at the same position after undergoing desorption and hydrogenation. In conclusion, the present study …

Authors

Ding Jiang,Hongping Li,Xiaoxue Cheng,Abdelfatah Abomohra,Yamin Hu,Arman Amani Babadi,Pietro Bartocci,Xun Hu,Shuang Wang

Journal

Fuel Processing Technology

Published Date

2023/11/1

Potential of Seaweeds to Mitigate Methane Emissions

Mitigating greenhouse gas emissions has become a top priority to limit global warming. Methane emissions from the agricultural sector, particularly arising from ruminant animals, are a major concern and a significant contributor to greenhouse gas emissions. Seaweeds have emerged as a promising solution to address this challenge. Some, such as the red alga Asparagopsis taxiformis, are rich in bromoform, a volatile halogenated compound that has been found to inhibit methanogenesis in the gastrointestinal tract of ruminant animals. Scientific findings are promising, as trials have demonstrated that incorporating seaweed into animal feed at low levels has shown highly effective methane suppression. The prospect of a seaweed-based feed additive to reduce livestock emissions has sparked excitement, resulting in numerous companies working on solutions using Asparagopsis. Ongoing research and …

Authors

Sophie Leonie Steinhausen,Abdelfatah Abomohra,Dieter Hanelt

Published Date

2023/12/1

Monophenols recovery by catalytic pyrolysis of waste sawdust over activated biochar from the brown macroalgae Hizikia fusiformis: Mechanism and life-cycle assessment

As an indispensable by-product of thermal conversion process, biochar can be modified to achieve outstanding performance in many applications. In particular, it has favorable properties for catalytic pyrolysis due to its advantageous porous structure and abundant surface functional groups. In the present study, the ecological impact of activated biochar obtained from phaeophyte Hizikia fusiformis was evaluated using life cycle assessment (LCA) approach. Subsequently, activated biochar was employed as a catalyst during pyrolysis of waste sawdust for monophenols recovery. Concretely, activated biochar was prepared from H. fusiformis in a fixed bed reactor through a two-step activation method. Results of LCA showed that employment of KOH has the highest environmental burdens in all steps for all studied impact categories. In addition, it was found that employment of KOH as an activator resulted in lower …

Authors

Weiwei Shen,Bin Cao,Mao Mu,Chuan Yuan,Chao Li,Xun Hu,Shuang Wang,Abdelfatah Abomohra

Journal

Journal of Analytical and Applied Pyrolysis

Published Date

2023/1/1

Integrated approach for enhanced crude bio-oil yield from microalgae cultivated on the aqueous phase of hydrothermal co-liquefaction with agar-free seaweed residues

The present study evaluated the efficiency of microalgae cultivation on the aqueous phase (Aq-LP) produced from (Co-)hydrothermal liquefaction (HTL) of agar-free seaweed waste. Optimization of bio-oil production from Co-HTL of seaweed residue with the studied microalgal biomass grown in Bold's Basal Medium (BBM) was initially carried out using Box-Behnken model. The highest bio-oil yield of 42.21% was recorded by HTL of microalgal biomass at 250 °C for 60 min, which showed insignificant difference with that from Co-HTL. Comparatively, Aq-LP from microalgal biomass showed the highest organic load with total organic carbon of 11.69 g L−1, while that from seaweed residue showed the lowest value of 7.47 g L−1. However, mineral ions in the Aq-LP from seaweed residue showed higher values compared to microalgal biomass. Therefore, Co-HTL enriched the Aq-LP with nutrients from both feedstocks …

Authors

Mohamed E El-Hefnawy,Sultan Alhayyani,Ali Ismail,Mohsen El-Sherbiny,Mamdouh Al-Harbi,Abdelfatah Abomohra,Mohamed Sakran,Nahla Zidan

Journal

Journal of Cleaner Production

Published Date

2023/3/15

Exploring the Prospects of Fermenting/Co-Fermenting Marine Biomass for Enhanced Bioethanol Production

With the rising demands for renewable fuels, there is growing interest in utilizing abundant and sustainable non-edible biomass as a feedstock for bioethanol production. Macroalgal biomass contains a high content of carbohydrates in the form of special polysaccharides like alginate, agar, and carrageenan that can be converted to fermentable sugars. In addition, using seagrass as a feedstock for bioethanol production can provide a sustainable and renewable energy source while addressing environmental concerns. It is a resource-rich plant that offers several advantages for bioethanol production, including its high cellulose content, rapid growth rates, and abundance in coastal regions. To reduce sugar content and support efficient microbial fermentation, co-fermentation of macroalgae with seagrass (marine biomass) can provide complementary sugars and nutrients to improve process yields and economics. This review comprehensively covers the current status and future potential of fermenting macroalgal biomass and seagrass, as well as possible combinations for maximizing bioethanol production from non-edible energy crops. An overview is provided on the biochemical composition of macroalgae and seagrass, pretreatment methods, hydrolysis, and fermentation processes. Key technical challenges and strategies to achieve balanced co-substrate fermentation are discussed. The feasibility of consolidated bioprocessing to directly convert mixed feedstocks to ethanol is also evaluated. Based on current research, macroalgae-seagrass co-fermentation shows good potential to improve the bioethanol yields, lower the cost, and enable more …

Authors

Mohamed EH Osman,Atef M Abo-Shady,Mostafa E Elshobary,Mahasen O Abd El-Ghafar,Dieter Hanelt,Abdelfatah Abomohra

Published Date

2023/10/26

Marine-Based Biorefinery: A Path Forward to a Sustainable Future

Biofuels and bio-based products are among the best alternatives to fossil-based fuels and chemicals due to their capacity for net-negative carbon emissions, which is a vital contribution to the global ambition of a net-zero economy [1–3]. Biorefinery could enhance the overall energy output and the economic feasibility of biomass conversion [4]. However, current biorefinery technologies mainly rely on edible crops and freshwater as the main inputs in the process. With an ever-growing population and demand for biofuels and other bio-based products, there are concerns over the use of the world’s limited freshwater and food crop resources for non-nutritional activities. Mainly, there is apprehension regarding the availability of adequate arable land and freshwater to meet the required biomass production for satisfying the projected biofuel demand and effectively capturing the excessive CO2 emissions that have been released into the atmosphere. It is in this context that marine-based biorefinery represents a new approach, where seawater, marine biomass (seaweed), and marine microorganisms (yeast, bacteria, and/or microalgae) are used in fermentation processes for the production of biofuels and bio-based compounds [5]. Seas and oceans cover more than 70% of the Earth’s surface and contain more than 97% of the Earth’s water, as well as the minerals needed for seaweed growth and their subsequent conversion to bioenergy. Compared to terrestrial biomass, seaweed grows much faster, is up to 50 times more efficient in CO2 fixation, and is hugely abundant worldwide. Moreover, seaweed can be cultivated in the sea, forming sea forests with …

Authors

Abdelrahman Zaky,Abdelfatah Abomohra

Published Date

2023/6/10

Has the time finally come for green oleochemicals and biodiesel production using large-scale enzyme technologies? Current status and new developments

With the growth of the chemical industry over the last decade, the need for cheaper (and more environmentally friendly) alternatives to petrochemicals of ever-increasing cost has grown steadily. Oleochemicals and biodiesel (OC/BD) are considered as green alternatives to petroleum derivatives, because they come from renewable oils and fats. OC/BD are currently produced by the traditional energy intensive chemical catalyzed methods, which have several economic and environmental drawbacks. For these reasons, the enzymatic production of OC/BD has attracted a growing attention for their greener pathway with respect to the chemically catalyzed processes. Lipase-catalyzed processes have a low energy requirement, since reactions are performed under atmospheric pressure and mild temperature and without the creation of side reactions. Furthermore, utilization of enzyme catalysts offers many advantages …

Authors

Ahmad Mustafa,Shah Faisal,Inas A Ahmed,Mamoona Munir,Eliane Pereira Cipolatti,Evelin Andrade Manoel,Carlo Pastore,Luigi di Bitonto,Dieter Hanelt,Febri Odel Nitbani,Zeinhom M El-Bahy,Abrar Inayat,Tamer MM Abdellatief,Konstantza Tonova,Awais Bokhari,Abdelfatah Abomohra

Published Date

2023/12/1

Recent advances in micro-/nanoplastic (MNPs) removal by microalgae and possible integrated routes of energy recovery

Reliance on plastic has resulted in the widespread occurrence of micro-/nanoplastics (MNPs) in aquatic ecosystems, threatening the food web and whole ecosystem functions. There is a tight interaction between MNPs and microalgae, as dominant living organisms and fundamental constituents at the base of the aquatic food web. Therefore, it is crucial to better understand the mechanisms underlying the interactions between plastic particles and microalgae, as well as the role of microalgae in removing MNPs from aquatic ecosystems. In addition, finding a suitable route for further utilization of MNP-contaminated algal biomass is of great importance. The present review article provides an interdisciplinary approach to elucidate microalgae–MNP interactions and subsequent impacts on microalgal physiology. The degradation of plastic in the environment and differences between micro- and nanoplastics are discussed. The possible toxic effects of MNPs on microalgal growth, photosynthetic activity, and morphology, due to physical or chemical interactions, are evaluated. In addition, the potential role of MNPs in microalgae cultivation and/or harvesting, together with further safe routes for biomass utilization in biofuel production, are suggested. Overall, the current article represents a state-of-the-art overview of MNP generation and the consequences of their accumulation in the environment, providing new insights into microalgae integrated routes of plastic removal and bioenergy production.

Authors

Abdelfatah Abomohra,Dieter Hanelt

Published Date

2022/12/3

Sequential algal biofuel production through whole biomass conversion

Despite the recent advances in biofuel research, exploring novel sequential biofuel routes for energy recovery from biomass is a new vital approach to meet the sustainability provisions and enhance process economy. In recent years, algae have been studied as a promising feedstock for various biofuels with simultaneous wastewater treatment and CO2 sequestration. This chapter presents a critical overview of the engineered challenges on algal biofuel production, exploring the possible solutions through sequential biofuel recovery. Energy output from the algal biomass through different routes (e.g., direct biohydrogen production, anaerobic digestion, lipid transesterification, alcohol fermentation, and algal fuel cells) as well as application of integrated routes was evaluated. Herein, we present a successive high-throughput process for complete conversion of the algal biomass in order to achieve the full utilization of …

Authors

Mahdy Elsayed,Abd El-Fatah Abomohra

Published Date

2022/1/1

Enhanced lipid production and essential ω-fatty acids synthesis by the hypersaline biodiesel-promising microalga Tetraselmis elliptica through growth medium …

This study aimed to optimize growth medium composition for enhanced lipid and fatty acid production by the green halophilic chlorophyte Tetraselmis elliptica. The impact of different ratios of natural seawater, nitrogen source/concentration, carbon source/concentration, and trace metals on the growth, biomolecules, lipid accumulation, and lipid productivity was studied. In addition, fatty acid profile of the optimized growth medium was compared with that of the typical medium as a control, and biodiesel production as well as essential polyunsaturated fatty acids (PUFAs) were evaluated. Among all studied factors, 0.1 g L−1 KNO3, 0.01 g L−1 glycerol, and 7.0 mg L−1 FeSO4·7H2O significantly enhanced the lipid productivity of T. elliptica, and were used further to evaluate the impact of their combination. Cultivation of T. elliptica in the optimized medium showed enhancement of growth up to 16 days, which resulted in 30 …

Authors

Rasha Saad Marey,Atef M Abo-Shady,Hanan M Khairy,Ahmed M Abd El-Moneim,Abdelfatah Abomohra

Journal

Biomass Conversion and Biorefinery

Published Date

2022/9/14

Constitutive expression of codon optimized Trichoderma reesei TrCel5A in Pichia pastoris using GAP promoter

To address the deficient activity of TrCel5A in naturally secreted cellulase preparation, this study used the GAP promoter to induce constitutive expression of Trichoderma reesei TrCel5A in Pichia pastoris. A recombinant TrCel5A was screened out after gene optimization, synthesis, and expression. The biochemical and enzymatic properties of the new recombinant were characterized. As a result, optimization of shake-flask fermentation of the recombinant was obtained at 28 °C, 2% inoculum volume, an initial pH of 6.0, as well as glycerol and Tween-80 additions of 30 g/L and 6 g/L, respectively. Under the above-optimized conditions, the recombinant produced 14.8 U/mL of the enzyme activity at 96 h of fermentation. To further enhance enzyme production, pilot-scale cultivation was evaluated using 5-L bioreactors. Using high-cell-density fermentation, the recombinant strain increased enzyme activity to 130.4 U/ml …

Authors

Yun Hu,Renhui Bai,Shaohua Dou,Zhimeng Wu,Ali Abdulkhani,Mohammad Ali Asadollahi,Abd El-Fatah Abomohra,Fubao Sun

Journal

Systems Microbiology and Biomanufacturing

Published Date

2022/7

Energy Recovery from Fat, Oil and Grease (FOG)

The high percentage of fats, oils and grease (FOG) in wastewater discharges from kitchen waste streams is increasing rapidly due to the increasing demand for food and modern lifestyle. Direct discharge of FOG into sewer system results in many environmental and technical problems. It is energy-rich waste, while effective management is required to recover its energy. FOG collection from wastewater lines prior to discharge into the sewer networks is essential, and further conversion into biofuel could generate additional revenue. Therefore, recent research is focusing on different routes of FOG conversion into usable biofuel. Deep energetic and environmental analysis of FOG conversion into bioenergy concluded that FOG conversion is a very promising route for various biofuel production. This chapter presents an overview of engineered challenges related to various technologies used for energy recovery from FOG …

Authors

Mahdy Elsayed,Ahmed Tawfik,Abd El-Fatah Abomohra

Published Date

2022/2/8

Integrated marine biogas: A promising approach towards sustainability

Fossil fuel depletion, climate change, and increased global energy demands are the driving forces to find alternative sources of energy. Marine-based biorefinery has been recently discussed as a promising route to mitigate the environmental challenges, enhance the energy recovery, and provide a potential source for value-added products. Anaerobic digestion is a promising technology that can convert the organic compounds of marine ecosystems into biogas. To date, a comprehensive review incorporating integrated biogas potential and effective approaches to enhance seaweed digestibility for biogas production from marine resources has not been reported. Thus, the present review aims to explore and comprehensively present seaweed and other marine resources for potential biogas production. The basics and challenges of biogas production from seaweed are elucidated. The impact of biochemical composition on biogas and the microbial communities involved in anaerobic digestion of seaweed are discussed. Utilization of different techniques such as pretreatment, co-digestion, and sequential extraction of seaweed biomass to enhance the biogas yield and to mitigate the effect of inhibitors are presented. Specifically, this article evaluates the co-digestion of seaweed with other biomass feedstocks or liquid biowastes. Integration of marine microalgae cultivation on anaerobic digestate for value-added compound production, biogas upgrading, and bioenergy recovery provides a promising approach towards a zero-waste marine-based system.

Authors

Shah Faisal,Abdelrahman Zaky,Qingyuan Wang,Jin Huang,Abdelfatah Abomohra

Published Date

2022/10/7

Integrated microalgal biorefinery–Routes, energy, economic and environmental perspectives

Commercialization of microalgal biofuels is not yet attained even after plentiful of research and extensive scientific projects. Expending the cost and energy for producing single microalgal product proven to be unviable, and hence integrating multiple product generation from single batch of biomass was considered as effective. This review focusses on delineating the challenges associated with individual fuel production pathways and merits of integrating different fuel production pathways. The advantages of integrated microalgal biorefinery have been summarized along with energy output and economic impact. Integrated production of different biofuels enhances the energy output significantly (biodiesel + biocrude oil - 18.8 MJ kg−1, biodiesel + bioethanol - 15.4 MJ kg−1, biodiesel + biogas - 13.4 MJ kg−1) and reduced the cost of biomass production by about 60% and 40% for biodiesel and other fuel productions …

Authors

Shuang Wang,Yerkebulan Mukhambet,Sivakumar Esakkimuthu

Published Date

2022/5/10

Recent advances in anaerobic digestion of lipid-rich waste: challenges and potential of seaweeds to mitigate the inhibitory effect

Considerable attention has been devoted towards anaerobic digestion of lipid-rich waste (LRWs) due to their higher energy content comparing to other waste rich in carbohydrates and proteins. However, there are still many challenges for LRWs anaerobic digestion which are mainly attributed to floatation, foaming, long-chain fatty acids (LCFAs) accumulation, and nutrients imbalance resulting in reactor instability and failure. The present review aims to report the recent progress in LRWs production, with a special focus on the main challenges for anaerobic digestion and the recent advances to enhance the digestion process including pretreatment, microbial acclimatization, dosing of trace elements, carrier addition, and co-digestion. Regarding the later, main characteristics and potential of seaweeds to mitigate the toxic effect of LRWs towards enhanced anaerobic digestion through cascading approach was …

Authors

Abdelfatah Abomohra,Shah Faisal,Reham Ebaid,Jin Huang,Qingyuan Wang,Mahdy Elsayed

Published Date

2022/12/1

Alleviating lignin repolymerization by carbocation scavenger for effective production of fermentable sugars from combined liquid hot water and green-liquor pretreated softwood …

Pretreatment is the key factor for producing fermentable sugars and biofuels from lignocellulosic biomass. However, during pretreatment lignin repolymerization occurs which reduces the efficiency of carbohydrates hydrolysis. In the present study, three additives (2-naphthol-7-sulfonate, 2-naphthol, and mannitol) were evaluated for boosting the effectiveness of combined pretreatment (liquid hot water + green liquor) of pine-wood biomass. The results revealed that supplied additives into combined pretreatment changed the physicochemical structure of lignin, therefore, alleviating the inhibitory effect of lignin repolymerization and notably raised sugars yield (glucose, xylose) ranging from 85% to 93%. XPS and FTIR analyses confirmed that −OH groups of additives led to lower formation of phenolic hydroxyl (PhOH) and higher hydrophilic groups of lignin, accounting for reduced non-specific binding of lignin into …

Authors

Meysam Madadi,Mahmoud MA Bakr,Ali Abdulkhani,Mohammad Ali Asadollahi,Chihe Sun,Fubao Sun,Abd El-Fatah Abomohra

Journal

Energy Conversion and Management

Published Date

2022/1/1

Cultivation of freshwater microalgae in wastewater under high salinity for biomass, nutrients removal, and fatty acids/biodiesel production

PurposeMicroalgae show growth and fatty acids (FAs) accumulation up to a certain level which is dependent on species and type of cultivation conditions. Application of abiotic stress on microalgae can induce nutrient uptake and enhance biocomponent accumulation.MethodsIn the current study, freshwater microalgae (Chlorella sorokiniana GEEL-01 and Desmodesmus asymmetricus GEEL-05) were investigated for growth, nutrient removal, and FAs composition during cultivation in municipal wastewater under high NaCl concentration (150 to 600 mM) along with control (w/o NaCl addition).ResultsThe growth of both microalgae declined upon an increase in NaCl concentration in the wastewater. GEEL-05 showed higher growth of 0.572 OD680 nm at 150 mM NaCl, followed by 0.40 and 0.174 OD680 nm in 300 and 450 mM NaCl, respectively. Both microalgae were completely inhibited at 600 mM NaCl. GEEL-01 …

Authors

Qi Yang,Min Zhang,Hend A Alwathnani,Muhammad Usman,Badr A Mohamed,Abd El-Fatah Abomohra,El-Sayed Salama

Journal

Waste and Biomass Valorization

Published Date

2022/7

One-step lignocellulose fractionation using acid/pentanol pretreatment for enhanced fermentable sugar and reactive lignin production with efficient pentanol retrievability

To valorize whole lignocellulosic biomass, this study proposed a biphasic solvent system using dilute acid (DA)/pentanol pretreatment. Effects of the key factors, i.e., temperature and pentanol concentration, on aspen were evaluated. Under identified optimal pretreatment conditions (160 °C, 60% pentanol), 85% and 91% of lignin and hemicellulose were solubilized in separate organic and liquid phases, respectively, while 91.1% of cellulose was retained in solid fraction. Enzymatic digestibility efficiency of pretreated cellulose was ∼ 6.4-times higher than that of untreated biomass. Notably, excellent pentanol recovery rates were obtained after four-times recycling (84%) with great cellulose digestibility (81%) and delignification (71%) performance. The recovered lignin contained low levels of contaminated sugars (<1%), while it could stabilize and protect high amounts of β-O-4 bonds. Besides, high phenolic OH …

Authors

Meysam Madadi,Guojie Song,Keikhosro Karimi,Daochen Zhu,Mahdy Elsayed,Fubao Sun,Abdelfatah Abomohra

Journal

Bioresource technology

Published Date

2022/9/1

CO2-Mediated Energy Conversion and Recycling

Carbon-di-oxide (CO2) is inevitable in most of the anthropogenic activities of wider range from household to energy sector. Global CO2 emissions are always monitored and stringent regulations are constantly being made by different countries to mitigate its level, as the exceedance is linked to severe health problems. Carbon dioxide capture and utilization (CCU) is an effective method to mitigate and balance the ever-raising CO2 levels in the atmosphere. For instance, CO2 utilization by microalgal biomass is shown to be significantly effective, which serves the dual purpose of reducing atmospheric CO2 and effective biomass production. On the other hand, synthetic fuel production by forming isobutanol through sequential utilization of CO2 along with hydrogen from electrolysis of water is a significant emerging approach. Carbon from waste CO2 emission can also be effectively utilized to produce polymers like …

Authors

Sivakumar Esakkimuthu,Shuang Wang,Abd El-Fatah Abomohra

Published Date

2022/2/8

Enhanced energy production and biological treatment of swine wastewater using anaerobic membrane bioreactor: Fouling mechanism and microbial community

This study aimed to reveal the membrane fouling mechanisms during anaerobic membrane bioreactor (AnMBR) operation for swine wastewater treatment under different organic loading rates (OLR). Results showed that AnMBR could achieve high pollutant removal (71.9–83.6 %) and energy recovery (0.18–0.23 L-CH4/g-COD) at an OLR range of 0.25–0.5 g-COD/g-VSS.d, realizing energy production. However, higher OLR would aggravate the membrane fouling due to accumulation of fine sludge particles, organic foulants, and extracellular polymeric substances (EPS) on cake layer. Based on the high-throughput sequencing, microbial communities significantly changed and fouling-causing bacteria (e.g. Pseudomonas, Methanosarcina and Methanothrix) enriched in the cake layer at higher OLR conditions, leading to lower membrane permeability. Backwash can effectively remove the cake layer from the …

Authors

Yunhui Pu,Jialing Tang,Ting Zeng,Yisong Hu,Qingyuan Wang,Jin Huang,Shengwang Pan,Xiaochang C Wang,Yuyou Li,Huu Hao Ngo,Abdelfatah Abomohra

Journal

Bioresource Technology

Published Date

2022/10/1

Enhanced waste glycerol recycling by yeast for efficient biodiesel production: Towards waste biorefinery

The present study aimed to evaluate a new oleaginous yeast for biodiesel production with high potential of lipid accumulation in waste glycerol as a carbon source. Seven strains were isolated and identified using 5.8S-ITS based on their ability to assimilate glycerol. Naganishia diffluens CDU-M7rc showed the maximum lipid productivity (LP) of 881.9 mg L−1 d−1 at 96 h. Further optimization of pretreated waste glycerol (PWG) concentration enhanced the biomass yield to 20.3 g L−1 using 100 g L−1 PWG and enhanced lipid content to 34.36 dw% at 120 g L−1 PWG. However, the highest LP of 1.704 g L−1 d−1 was recorded at 100 g L−1 PWG, which represented 2.2-time more than the control. Using glucose as a carbon source, the dominant fatty acids in N. diffluens CDU-M7rc lipids were C16:0, C18:1, and C18:2, representing 23.91%, 55.45%, and 13.46% of total fatty acids, respectively. Utilization of PWG …

Authors

Mei Li,Mohammad Kdaimes H Alotaibi,Li Li,Abd El-Fatah Abomohra

Journal

Biomass and Bioenergy

Published Date

2022/4/1

Maximizing nitrogen removal and lipid production by microalgae under mixotrophic growth using response surface methodology: towards enhanced biodiesel production

The present study aimed to optimize synthetic wastewater composition as a mixotrophic medium for enhanced growth and lipid accumulation coupled with high nitrogen removal by the green microalga Chlorella sp. Individual effects of the three main independent variables (nitrate concentration, seawater ratio, and glycerol supplementation) were tested initially, then response surface methodology (RSM) was subsequently performed to explore the optimum combined conditions. The highest lipid productivity of 37.60 mg/L day was recorded at 25% seawater. Glycerol supplementation enhanced both lipid content and biomass production, which resulted in the highest recorded lipid productivity of 42.61 mg/L day at 4 g/L glycerol. Central composite design followed by numerical optimization was further applied which suggested NaNO3 concentration at 101.5 mg/L, seawater ration of 23.8%, and glycerol supplementation of 0.25 g/L as the optimum conditions for dual maximum lipid productivity and nitrogen removal of 46.9 mg/L day and 98.0%, respectively. Under the optimized conditions, dry weight and lipid content increased by 31.9% and 20.3%, respectively, over the control, which resulted in increase in lipid productivity by 71.5%. In addition, optimization process resulted in pronounced changes in fatty acid proportions where saturated fatty acids increased by 7.4% in the optimized culture with simultaneous reduction of polyunsaturated fatty acids. The estimated biodiesel characteristics calculated from the fatty acid methyl ester (FAMEs) profile showed agreement with the international standards, while optimized cultures showed an 8.5% lower …

Authors

Abdelfatah Abomohra,Mei Li,Shah Faisal,Li Li,Mahdy Elsayed

Journal

Fermentation

Published Date

2022/11/27

Commercial seaweed liquid extract as strawberry biostimulants and bioethanol production

Seaweeds are increasingly intriguing as a sustainable source of bioactive compounds. They have applications in agriculture, fuels, feed, and food products. To become a cost-competitive product with zero waste, a biorefinery approach is applied, where several products are valorized at the same time. True-Algae-Max (TAM®) has been investigated for its ability to improve the yield and nutritional facts of a strawberry plant. Three concentrations of TAM (0, 50, and 100%) were examined by foliar spray in 2017 with 50% NPK chemical fertilizer. Results indicated that growth, yield, chlorophyll, and potassium content were significantly improved by TAM treatments. TAM50 % resulted in maximum root length, leaf area, plant fresh weight, fruit weight, and yield with an increase ranging from 10 to 110% compared to control. Compared to the NPK control, strawberries grown with TAM50% improved total soluble solids (TSS) from 7.58 to 10.12% and anthocyanin from 23.08 to 29.42 mg CGE 100 g−1. Noteworthily, this reduced total sugar, and total phenolics were boosted by TAM applications, while non-reducing sugar was reduced compared to control. On the other hand, whole seaweed biomass and TAM residuals were used for bioethanol production by acid scarification. The maximum bioethanol yield was observed in residual biomass (0.34 g g−1 dw), while the whole seaweed biomass showed only 0.20 g g−1 dw. These results proved the biorefinery concept of using seaweed extract as a biostimulator and bioethanol production.

Authors

Mohamed Ashour,Ahmed Said Al-Souti,Shimaa M Hassan,Gamal AG Ammar,Ashraf MA-S Goda,Rania El-Shenody,Abd El-Fatah Abomohra,Ehab El-Haroun,Mostafa E Elshobary

Journal

Life

Published Date

2022/12/28

Progress in biohythane production from microalgae-wastewater sludge co-digestion: An integrated biorefinery approach

Recent advances in microalgae to biohythane (bio-H2 and bio-CH4) conversion have achieved growing attention due to their eco-friendly and energy-efficient nature. Although microalgae are considered a potential 3rd – 4th generation biomass, their low C/N ratio and cell-wall biopolymers are challenging for biohythane production. This study emphasizes the solutions to mitigate the adverse effects of microalgae-based biohythane production using co-digestion with wastewater sludge. Wastewater sludge, an emerging environmental concern, is reviewed to be an effective co-substrate with microalgae to establish a biorefinery approach. The future trends and prospects of this biorefinery approach is critically reviewed to attain a profitable process. This study also reviewed the advantages of microalgae-wastewater co-cultivation and the application of activated sludge for bio-flocculation as a cost-effective solution for …

Authors

Sadib Bin Kabir,Md Khalekuzzaman,Nazia Hossain,Mamun Jamal,Md Asraful Alam,Abd El-Fatah Abomohra

Published Date

2022/7/1

Enhanced methane production coupled with livestock wastewater treatment using anaerobic membrane bioreactor: Performance and membrane filtration properties

The present study introduced a new method for enhanced biomethane production and pollution control of swine wastewater (SW) using anaerobic membrane bioreactor (AnMBR). Results confirmed 35 °C as the optimum temperature for enhanced anaerobic digestion which resulted in relatively higher methane production rate and potential. In AnMBR system, robust pollutants removal and conversion rate were achieved under various hydraulic retention time (HRT) ranging from 20 to 10 days, while the highest methane yield (0.24 L/g-CODremoved) and microbial activity (6.65 mg-COD/g-VSS·h) were recorded at HRT of 15 days. Reduction of HRT to 10 days resulted in serious membrane fouling due to accumulation of extracellular polymeric substances (EPS) and cake layer on the membrane. However, cake layer as the dominant membrane foulant could be effectively removed through periodic physical backwash …

Authors

Jialing Tang,Yunhui Pu,Ting Zeng,Yisong Hu,Jin Huang,Shengwang Pan,Xiaochang C Wang,Yuyou Li,Abd El-Fatah Abomohra

Journal

Bioresource Technology

Published Date

2022/2/1

Evaluation of crude bio-oil production from green tea waste (GTW) through pyrolysis over clamshell waste as a natural catalyst

The present study aimed to evaluate the effect of clamshell waste (CSW) as a natural catalyst to enhance the bio-oil yield and composition through pyrolysis with green tea waste (GTW). Initially, volatiles from GTW pyrolysis were allowed to pass through a capsule filled with CSW, which showed insignificant changes in bio-oil yield with 31.6%, 12.3%, 23.5%, and 11.6% increase in hydrocarbons, esters, alkanes/alkenes, and phenols, respectively. Further, CSW was directly mixed with GTW at ratios of 2.5%, 5.0%, 7.5%, and 10.0% (w/w) in comparison with the control (using GTW only). Results showed that caffeine was the dominant component in the bio-oil, representing 39.9% in the control, which could be used to enhance the process feasibility through biorefinery approach. Using 7.5% CSW enhanced the bio-oil yield by 10.2% over the control. In addition, CSW application showed desirable composition of the bio …

Authors

Li Li,Jin Huang,Liudong Chen,Shah Faisal,Abdelfatah Abomohra

Journal

Sustainable Energy Technologies and Assessments

Published Date

2022/10/1

Pollutant removal and energy recovery from swine wastewater using anaerobic membrane bioreactor: a comparative study with up-flow anaerobic sludge blanket

Due to its high content of organics and nutrients, swine wastewater has become one of the main environment pollution sources. Exploring high-efficient technologies for swine wastewater treatment is urgent and becoming a hot topic in the recent years. The present study introduces anaerobic membrane bioreactor (AnMBR) for efficient treatment of swine wastewater, compared with up-flow anaerobic sludge blanket (UASB) as a traditional system. Pollutant removal performance, methanogenic properties, and microbial community structures were investigated in both reactors. Results showed that by intercepting particulate organics, AnMBR achieved stable and much higher chemical oxygen demand (COD) removal rate (approximately 90%) than UASB (around 60%). Due to higher methanogenic activity of anaerobic sludge, methane yield of AnMBR (0.23 L/g-COD) was higher than that of UASB. Microbial community structure analysis showed enrichment of functional bacteria that can remove refractory organic matter in the AnMBR, which promoted the organics conversion processes. In addition, obvious accumulation of acetotrophic and hydrotrophic methanogens in AnMBR system was recorded, which could broaden the organic matter degradation pathways and the methanogenesis processes, ensuring a higher methane yield. Through energy balance analysis, results concluded that the net energy recovery efficiency of AnMBR was higher than that of UASB system, indicating that applying AnMBR for livestock wastewater treatment could not only efficiently remove pollutants, but also significantly enhance the energy recovery.

Authors

Yunhui Pu,Jialing Tang,Ting Zeng,Yisong Hu,Jixiang Yang,Xiaochang Wang,Jin Huang,Abdelfatah Abomohra

Journal

Water

Published Date

2022/8/6

Innovative approach for rapeseed straw recycling using black solider fly larvae: Towards enhanced energy recovery

The present study evaluated bio-recycling of rapeseed straw (RS) mixed in different ratios with chicken manure using black soldier fly larvae (BSFL) followed by biodiesel and protein production as an innovative waste management and biorefinery route. Among different treatments, 20% RS ratio showed high fiber biodegradation with enhanced larval biomass yield and lipid accumulation. The average larval development time on the chicken manure was 18.3 days, which significantly reduced to 14.0 days using 20% RS. In addition, application of 20% RS significantly enhanced the survival rate, with higher conversion efficiency comparing to the control. Interestingly, saturated fatty acids content of the produced biodiesel at 20% RS was much higher than that reported for the biodiesel produced currently from rapeseed oil, which resulted in higher cetane number. Based on the current biodiesel industry from rapeseed …

Authors

Mahdy Elsayed,Wu Li,Nashwa S Abdalla,Ping Ai,Yanlin Zhang,Abd El-Fatah Abomohra

Journal

Renewable Energy

Published Date

2022/4/1

Enhancement of antioxidant properties of Gongolaria barbata (Phaeophyceae) by optimization of combined light intensity and salinity stress

The present study aimed to optimize the light intensity coupled with different salinity regimes for enhanced growth and antioxidant properties of the brown seaweed Gongolaria barbata. Five experimental trials (T1–T5) were suggested using response surface methodology, where growth rate and antioxidant properties of G. barbata were evaluated in each run at the end of the experiment. The model for growth rate showed differences not statistically significant among all studied groups. However, concentration of methanol extract needed to scavenge 50% of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radicals (IC50), total phenolics, total flavonoids, total carotenoids, chlorophyll a and chlorophyll c showed significant differences among the five studied groups. Total phenolic and flavonoid contents were primarily affected by light, showing the highest values of 2.08 mg gallic acid equivalent g−1 and 2.41 mg rutin g−1 at …

Authors

İlknur Ak,Ekrem Cem Çankırılıgil,Gülen Türker,Onur Sever,Abdelfatah Abomohra

Journal

Phycologia

Published Date

2022/11/2

Improving recycled concrete aggregates using flue gas based on multicyclic accelerated carbonation: Performance and mechanism

Utilizing flue gas from cement plants to treat the recycled concrete aggregates (RCAs) through accelerated carbonation is a new strategy for reducing carbon emission and improving the quality of RCAs. However, due to the low CO2 concentration, carbonation efficacy is always unsatisfactory. In this study, multicyclic carbonation treatment was performed to enhance the carbonation efficacy using flue gas as CO2 source. The key operation parameters including carbonation duration, gas pressure and cycle numbers were optimized, and the carbonation performance and mechanisms were evaluated. Results showed that treating the RCAs for six cycles within 24 h at gas pressure of 0.1 MPa could obtain satisfactory carbonation percentage. Microstructure analysis verified that, after multicyclic carbonation, large amount of calcium hydroxides were converted into calcium carbonates to reduce the porosity and promote …

Authors

Yunhui Pu,Lang Li,Xiaoshuang Shi,Qingyuan Wang,Abdelfatah Abomohra

Journal

Construction and Building Materials

Published Date

2022/12/26

Endogenous bioethanol production by solid-state prefermentation for enhanced crude bio-oil recovery through integrated hydrothermal liquefaction of seaweeds

The present study evaluated the action of endogenous bioethanol produced during solid-state fermentation of Ulva spp. on subsequent hydrothermal liquefaction (HTL). HTL of raw biomass (RB) was compared with HTL of the fermented biomass after bioethanol separation (F-Aqua) and HTL of the whole fermentation broth containing the bioethanol (F-Eth). Optimization of fermentation conditions increased the ethanol yield efficiency (Yeff) and specific ethanol yield (SEY) from 23.55% and 0.120 g g−1 sugar consumed to 43.97% and 0.224 g g−1 sugar consumed, respectively. TGA and FTIR analysis confirmed noticeable changes in the thermal profile and functional groups of the fermented residue with increased volatiles and lower ash content. Among different HTL treatments, F-Eth showed the highest bio-oil yield of 24.96% at 250 °C, which was 37.7% and 39.0% higher than that of RB and F-Aqua, respectively. In …

Authors

Mohamed E El-Hefnawy,Sultan Alhayyani,Mohsen M El-Sherbiny,Abd El-Fatah Abomohra,Mamdouh Al-Harbi

Journal

Journal of Cleaner Production

Published Date

2022/6/25

Waste-to-Energy

The continuous increase in global population and concurrent fast industrialization led to massive generation of municipal wastes, with raised challenges of safe disposal. The proper management of municipal wastes through recycling is an essential approach for global sustainable development. So far, many countries established regulatory guidelines for different waste management routes and pollution control measures. However, most of the applied routes are waste dumping, composting or direct discharge in water bodies without adequate pretreatment, which seriously threaten the environment and human health. Despite the applicability of incineration for waste disposal, the low thermal value and high organic load of the waste streams are the main obstacles. However, proper waste segregation and separation provide an efficient option for waste conversion into energy. Thus, waste-to-energy is nowadays a …

Authors

Abd El-Fatah Abomohra,Qingyuan Wang,Jin Huang

Published Date

2022

Enhancement of black and odorous water treatment coupled with accelerated lipid production by microalgae exposed to 12C6+ heavy-ion beam irradiation

In this study, Auxenochlorella protothecoides (AP-CK) was selected due to its reported high growth potential in sterilized black and odorous water (SBOW). In order to improve the resource utilization level of microalgae for wastewater treatment, AP-CK was mutated using 12C6+ heavy-ion beam irradiation, and a high lipid-containing mutant (AP-34#) was isolated and further evaluated to treat original black and odorous water (OBOW). Compared with the wild type, the maximum removal rates of COD, NH4+-N and TP of the mutant increased by 8.12 ± 0.33%, 10.43 ± 0.54% and 11.97 ± 0.16%, respectively, while maximum dissolved oxygen content increased from 0 to 4.36 ± 0.25 mg/L. Besides, the mutant lipid yield increased by 115.87 ± 3.22% over the wild type in OBOW. The fatty acid profile of AP-34# grown in SBOW and OBOW showed higher proportion of saturated fatty acids (C16:0 and C18:0) and valuable …

Authors

Yitong Shao,Yongsheng Fu,Yangwu Chen,Abdelfatah Abomohra,Qi He,Wenjie Jin,Jian Liu,Zhouliang Tan,Xin Li

Journal

Chemosphere

Published Date

2022/10/1

Bioenergy characteristics of microalgae under elevated carbon dioxide

Nowadays, biological mitigation of carbon dioxide (CO2) by means of microalgae is one of the promising approaches, as biomass can be used to produce renewable fuels such as biodiesel and crude bio-oil. In this study, the growth of Desmodesmus sp. in response to different CO2 levels (ambient air, 5%, 10%, 15%, 20%, 25%, 30%, and 35% CO2) was studied, and then the suitability of the biomass for bio-oil and biodiesel production was evaluated. The studied strain was able to grow efficiently in a broad range of elevated CO2 (5–30%, v/v), suggesting its suitability for CO2 mitigation. The highest specific growth rate (0.769 d−1) and biomass productivity (0.033 g L−1 d−1) were achieved at 15% CO2; therefore, the concentration of 15% CO2 was selected as the optimum. Alpha-Linolenic acid (ALA) was the dominant polyunsaturated fatty acids (PUFAs) in studied Desmodesmus strain, and its content increased …

Authors

Bahram Barati,Fatemeh Fazeli Zafar,Lili Qian,Shuang Wang,Abd El-Fatah Abomohra

Journal

Fuel

Published Date

2022/8/1

Microalgae as a Natural CO2 Sequester: A Study on Effect of Tobacco Smoke on Two Microalgae Biochemical Responses

Microalgae are known as the most efficient biological sequesters of carbon dioxide (CO2). Recently, they have been exploited to enhance air quality by decreasing CO2 levels and increasing oxygen (O2) concentrations. However, in public places, there are sources of toxic chemicals such as tobacco smoke that may affect the growth of microalgae. For the first time, the current study explores the influence of tobacco smoke on the cell growth, biodiesel characteristics, and biochemical composition of two strains of model microalgae. Chlamydomonas strains were treated with tobacco smoke in a sealed box for 7 days, wherein every 1 h, one cigarette was burnt. Upon exposure of microalgae to tobacco smoke, the specific growth rate (μmax) was unaffected in CHL-2220 and remained around 0.500 days−1, whereas in CHL-2221, it decreased notably from 0.445 days−1 to 0.376 days−1. In the CHL-2221, the lipid level considerably reduced from 15.55 %DW to 13.37 %DW upon exposure to tobacco smoke. In both strains, palmitic acid was the main constituent of saturated fatty acids (SFAs) that displayed significant (p < 0.05) decreases in response to tobacco smoke exposure. In CHL-2221, oleic acid (C18:1) presented a substantial increase from 7.64 to 17.09% in response to tobacco smoke. Moreover, exposure of CHL-2220 to tobacco smoke decreased the cetane number (CN) from 30.34 to 25.28, while in CHL-2221, it increased from 26.07 to 29.73 upon treatment. Both strains demonstrated low-quality biodiesel to be used as feedstock. Conversely, their fatty acid profile revealed their promising use as nutrient food.

Authors

Bahram Barati,Fatemeh Fazeli Zafar,Arman Amani Babadi,Chen Hao,Lili Qian,Shuang Wang,Abd El-Fatah Abomohra

Journal

Frontiers in Energy Research

Published Date

2022/3/31

Caproic acid production through lactate-based chain elongation: effect of lactate-to-acetate ratio and substrate loading

Substrate properties play a key role in promoting the caproate yield through lactate-based carbon chain elongation pathway. In the present study, the effect of lactate-to-acetate (LA/AA) carbon ratio (from 0.5 to 5.0) and substrate loading (in terms of substrate/inoculum ratio within the range 20–180 mmol-C/g-VSS) on caproate fermentation was investigated. Results showed that both caproate content and yield increased by increasing the LA/AA ratio up to 3.0, then decreased at higher ratios due to activation of acrylate pathway and dispersion of carbon flux at elevated lactate content. At the optimal LA/AA carbon ratio of 3.0, substrate loading lower than 100 mmol-C/g-VSS was beneficial for efficient substrate utilization with low caproate selectivity, while higher substrate-to-inoculums (S/I) ratio led to incomplete substrate utilization and dispersed carbon flow, which finally reduced the caproate yield. Thus, the highest …

Authors

Jialing Tang,Yunhui Pu,Jin Huang,Shengwang Pan,Xiaochang C Wang,Yisong Hu,Huu Hao Ngo,Yuyou Li,Abdelfatah Abomohra

Journal

Environmental Technology & Innovation

Published Date

2022/11/1

Activation of nitrogen-doped carbon materials on the C–N bond and C–O bond: modeling study toward enhanced pyrolysis products

The present study investigated the effects of doped nitrogen atoms in carbon materials on the hydrodeoxygenation (HDO) and hydrodenitrogenation (HDN) processes. Density functional theory was used to evaluate the structural stability and catalytic activity of different nitrogen-doped carbon cluster models for HDO and HDN reactions. The results showed that the carbon atom near the nitrogen in graphite is the active center of nitrogen-doped carbon catalytic activation of hydrogen. In the H2-rich system, N@C catalysts can not only activate hydrogen molecules but also directly break the C–O/C–N bond. Results confirmed that the nitrogen assembly structure can affect the performance of C–O/C–N bond activation, and meta-doping nitrogen sites have the highest catalytic activity. This study provides theoretical guidance and views for the development of high-performance carbon catalysts that can replace …

Authors

Ding Jiang,Hongping Li,Xiaoxue Cheng,Shuang Wang,Abdelfatah Abomohra,Bin Cao

Journal

ACS Sustainable Chemistry & Engineering

Published Date

2022/5/26

Evaluation of biochar-derived carbocatalysts for pyrolytic conversion of sawdust: Life cycle assessment towards monophenol production

The present study aimed to prepare biochar-derived carbocatalysts (BDCs) from three feedstocks (seaweed, microalga and lignocellulosic biomass) and further evaluate the environmental impacts through life cycle assessment (LCA) methodology. It is indicated that the step of employing chemical activation agent had the highest environmental burdens for all impact categories, followed by activation, carbonization, and transport. Amongst, the carbocatalyst from seaweed (EN-BDC) presented the highest environmental impacts for all indicators. The catalytic performance for bio-monophenols was further studied. All carbocatalysts showed the performance of promoting monophenols, especially phenol, 2-methyl-phenol and p-cresol in the bio-oil. Amongst, EN-BDC was the best for producing monophenols (total up to 54.64% of bio-oil). Furthermore, characterization of fresh and spent catalysts were carried out to …

Authors

Bin Cao,Ding Jiang,Yijie Zheng,Parveen Fatemeh Rupani,Chuan Yuan,Yamin Hu,Hao Chen,Chao Li,Xun Hu,Shuang Wang,Jianping Yuan,Abdelfatah Abomohra

Journal

Fuel

Published Date

2022/12/15

Dual use of a local Protosiphon isolate BENHA2020 for biodiesel production and antioxidant activity of lipid-free biomass: A novel biorefinery approach for biomass valorization

The present study aimed to isolate and evaluate a local Protosiphon sp. for biodiesel production and antioxidant activity of its residual lipid-free biomass. Phylogenetic analysis confirmed that the isolate is Protosiphon botryoides. In the control medium using 250 mg L−1 NaNO3 as a nitrogen source, cells showed 37.7 dw% lipid content at stationary phase. At different nitrogen levels, increasing of nitrogen concentration resulted in obvious increase in growth, showing the maximum biomass productivity of 0.133 g L−1 d−1 at middle exponential phase using 750 mg L−1 NaNO3, with simultaneous reduction in lipid content, reaching its lowest recorded value of 27.9 dw%. Due to enhancement of lipid content of N-deficient culture (125 mg L−1 NaNO3), it showed the highest lipid productivity of 41.3 mg L−1 d−1. Fatty acid analysis confirmed the dominance of linoleic acid, eicosatrienoic acid, oleic acid, and palmitic acid …

Authors

Abd El-Fatah Abomohra,Hamed Eladel,Soha Mohammed

Journal

Renewable Energy

Published Date

2022/1/1

Co-production of levulinic acid and lignin adsorbent from aspen wood with combination of liquid hot water and green-liquor pretreatments

Efficient lignocellulosic fractionation and conversion into platform chemicals provide a considerable opportunity for the industrial operation of a lignocellulosic biorefinery. However, single-step pretreatments are often insufficient to overcome biomass recalcitrance as the existence of insoluble lignin generally restricts component fractionation and conversion. This study performed a two-step pretreatment, consisting of sequential liquid hot water (LHW) and green-liquor (GL), for bioprocessing of aspen biomass into bioproducts such as glucose, levulinic acid (LA), and lignin adsorbent. The two-step pretreated glucan-rich solid displayed high cellulose accessibility, which is responsible for 94% of the glucose yield. The optimized LHW pretreatment (200 °C, 40 min) solubilized 91% of the hemicellulose, which together with monomeric sugars in the hydrolysate solution was straightly heated at 190 °C for 80 min and …

Authors

Meysam Madadi,Mahmoud MA Bakr,Guojie Song,Chihe Sun,Fubao Sun,Zhikui Hao,Abdelfatah Abomohra

Journal

Journal of Cleaner Production

Published Date

2022/9/15

Selective oxidation of 5-hydroxymethylfurfural to furan-2, 5-dicarbaldehyde using chitosan-based biochar composite cadmium sulfide quantum dots

5-Hydroxymethylfurfural (HMF), an important biobased platform chemical, can be potentially oxidized to several products that can serve as versatile building blocks for polymers. 5-Hydroxymethyl-2-furan carboxylic acid (HMFCA) is formed by incomplete oxidation of HMF but the reaction often suffers from substrate inhibition and overoxidation to other products. In this study, resting cells of Gluconobacteroxydans DSM 50049 were shown to oxidize HMF quantitatively to HMFCA with exquisite selectivity. Complete conversion of 31.5 g L–1 crude HMF to HMFCA was achieved within 6 h under pH-controlled conditions. Initial productivity of 10 g L–1 h–1 was reduced to 2 g L–1 h–1 toward the end of the reaction. Thereafter, additional HMF added to the reaction mixture (12 g L–1) was converted up to 94% within 17 h with 100% selectivity resulting in final HMFCA concentration of 44.6 g L–1 and yield of 6.2 g g–1 cell dry …

Authors

Mahmoud Sayed,Sang-Hyun Pyo,Nicola Rehnberg,Rajni Hatti-Kaul

Journal

ACS sustainable chemistry & engineering

Published Date

2019/1/25

Catalytic co‐pyrolysis of macroalgal components with lignocellulosic biomass for enhanced biofuels and high‐valued chemicals

This study focuses on catalytic co‐pyrolysis of a lignocellulosic biomass (rice husk) and main components of the seaweed Enteromorpha clathrata (ie, protein, polysaccharide, and ash) using TGA and Py‐GC/MS analytical techniques with the aim and novelty to unveil their catalytic co‐pyrolysis thermal behaviors and synergistic effect of interactions between their catalytic co‐pyrolysis volatiles for enhanced biofuels and high‐valued chemicals production. Thus, in this study, rice husk was treated with macroalgal major components over ZSM‐5, MCM‐41, and blend of both catalysts using the Py‐GC/MS analytical technique to improve the quality of rice husk bio‐oil. Thermogravimetric analysis studies of pyrolysis, co‐pyrolysis, and catalytic co‐pyrolysis of lignocellulosic biomass with seaweed main components were also performed. Effects of HZSM‐5, MCM‐41, and blend of both catalysts on catalytic co‐pyrolysis …

Authors

Benjamin Bernard Uzoejinwa,Bin Cao,Shuang Wang,Xun Hu,Yamin Hu,Cheng Pan,Bin Li,Chinenye C Anyadike,Felix U Asoiro,Nwoke A Oji,Abd El‐Fatah Abomohra,Zhixia He

Journal

International Journal of Energy Research

Published Date

2022/3/10

Enhanced waste hot-pot oil (WHPO) anaerobic digestion for biomethane production: Mechanism and dynamics of fatty acids conversion

Resource depletion and climate changes due to human activities and excessive burning of fossil fuels are the driving forces to explore alternatives clean energy resources. Anaerobic digestion of bio-waste provides a unique opportunity to fulfil this objective through biogas production. The present study aimed to evaluate waste hot-pot oil (WHPO) at different feeding ratios as a novel lipidic waste for anaerobic mono-digestion. The highest recorded maximum biomethane potential (Mmax) was 274.1 L kg−1 VS at 1.2% WHPO, which showed significant differences with those of 0.8% and 1.6% (227.09 and 237.62 L kg−1 VS, respectively). The changes in volatile fatty acids (VFAs), medium chain fatty acids (MCFAs), and long-chain fatty acids (LCFAs) as intermediates of WHPO decomposition were investigated before and after anaerobic digestion. Results showed efficient production and utilization of VFAs at all studied …

Authors

Shah Faisal,Reham Ebaid,Li Li,Feng Zhao,Qingyuan Wang,Jin Huang,Abdelfatah Abomohra

Journal

Chemosphere

Published Date

2022/11/1

Biogas: Basics, Integrated Approaches, and Case Studies

Anaerobic digestion is by far the most important technology for providing clean renewable energy to millions of people in rural areas around the world. It produces biomethane with anaerobic-digestate as a byproduct that can be used as a biofertilizer. In the context of energy consumption, more than 85% of the total energy consumed currently comes from non-renewable fossil resources. A wide variety of biowastes can be used as feedstocks for biogas production. Biogas technology can provide sustainable, affordable, and eco-friendly green energy along with useful byproducts. This book discusses the basics of biogas production and aims to address the needs of graduate and postgraduate students as well as other professionals through further evaluation of biogas production via case studies.

Authors

Abdelfatah Abomohra,El-Sayed Salama

Published Date

2022/5/25

Sequential biofuel production from seaweeds enhances the energy recovery: A case study for biodiesel and bioethanol production

In the present study, eight seaweeds (five red, two brown and one green) were collected and evaluated for dual biodiesel and/or bioethanol production. The highest significant lipid and carbohydrate contents were recorded in the brown seaweed Dilophus fasciola (4.92 and 37.97%dw, respectively). Three routes were investigated, namely R1 and R2 for direct production of biodiesel and bioethanol, respectively, from the whole biomass, in addition to R3 representing the sequential biodiesel and bioethanol production. D. fasciola showed a biodiesel yield of 35.04 mg g−1 dw, composed mainly of C16‐C18 fatty acids with a high saturation degree. All biodiesel characteristics complied with the recommended values of international standards. The maximum reducing sugar content (37.2 g L−1) and bioethanol productivity at 72 hours (0.165 g L−1 h−1) were recorded in the lipid‐free biomass (R3), which were …

Authors

Mostafa E Elshobary,Rania A El‐Shenody,Abd El‐Fatah Abomohra

Journal

International Journal of Energy Research

Published Date

2021/3/25

High-grade biofuel production from catalytic pyrolysis of waste clay oil using modified activated seaweed carbon-based catalyst

In the present study, seaweed char-based catalyst was used for pyrolysis of waste clay oil to obtain high-grade biofuels. First, the biochar was activated at different temperatures of 600, 700, and 800 °C (Y600, Y700, and Y800, respectively). The specific surface area of seaweed char prepared by activation at 800 °C reached the maximum value (1227.74 m2/g), which was a good catalyst carrier. Then modified by Cu loading. Results showed that the seaweed carbon-based catalyst has a good decarboxylation effect. The obtained liquid product under catalytic pyrolysis showed the maximum heating value of 48402 kJ/kg by using 15% Cu/Y800 as a catalyst at feed/catalyst ratio of 10:1; with the highest hydrocarbon content, the content of long-chain hydrocarbons and aromatic hydrocarbons being 45.95% and 41.45%, respectively. The decarboxylation effect of Cu-modified seaweed char was obvious, and the copper …

Authors

Chuan Yuan,Abd El-Fatah Abomohra,Shuang Wang,Qian Liu,Shuang Zhao,Bin Cao,Xun Hu,Fatma Marrakchi,Zhixia He,Yamin Hu

Journal

Journal of Cleaner Production

Published Date

2021/9/1

Accelerated carbonation treatment of recycled concrete aggregates using flue gas: A comparative study towards performance improvement

CO2 source is one of the limiting factors for popularizing the accelerated carbonation technology in recycled concrete aggregates (RCAs) improvement. In this paper, the feasibility of using flue gas (CO2 content of 20 %) from cement plant as alternative CO2 source to improve RCAs was systematically studied and evaluated. Results showed that the carbonation extent and physical properties of the RCAs treated by flue gas were obviously improved and were comparable to those treated by commercial mixed gas with CO2 content between 20 % and 100 %. Based on the results of thermal gravimetric (TG), fourier transform infrared (FTIR) and X-ray diffraction (XRD) analysis, calcium hydroxide and calcium silicate hydrates in RCAs were significantly transformed into calcium carbonate at the optimal gas flow rate (5 L/min) after 168 h of treatment. The workability, compressive strength and flexural strength of concrete …

Authors

Yunhui Pu,Lang Li,Qingyuan Wang,Xiaoshuang Shi,Ling Fu,Guomin Zhang,Chenchen Luan,Abd El-Fatah Abomohra

Journal

Journal of CO2 Utilization

Published Date

2021/1/1

Enhancement of nitrite/ammonia removal from saline recirculating aquaculture wastewater system using moving bed bioreactor

Innovative removal of toxic nitrite and ammonia is one of the key approaches for efficient aquaculture biotechnology. This study suggests a fast removal technique of high-levels of nitrite and ammonia using recirculating aquaculture wastewater at 30‰ salinity. Four lab-scale moving bed biofilm reactors (MBBRs; R1, R2, R3, and R4) were operated in parallel for 56 days with different combinations of mature and fresh biofilms on biocarriers at 30% filling ratio. Nitrogen removal efficiency, biofilm physicochemical properties, and microbial analyses were conducted using PCR and sequencing techniques at the region of the 16S ribosomal RNA. The results showed that R4 (using mature biofilms) recorded the highest nitrite and ammonia removal (99.6% and 95.3%, respectively) compared to the control, R1 (94.1% and 89.4%). Meanwhile, the removal rate of ammonia in R4 was significantly the fastest compared to other …

Authors

Musa Abubakar Tadda,Changwei Li,Mostafa Gouda,Abd El-Fatah Abomohra,Abubakar Shitu,Amimul Ahsan,Songming Zhu,Dezhao Liu

Journal

Journal of Environmental Chemical Engineering

Published Date

2021/10/1

Enhancement of biodiesel yield and characteristics through in-situ solvo-thermal co-transesterification of wet microalgae with spent coffee grounds

This study evaluated in-situ co-transesterification of wet spent coffee ground (SCG)/microalgae mixture for enhanced biodiesel production. SCG and microalgae showed lipid contents of 16.0 and 23.6 wt%, respectively. A total of 27 transesterification runs were performed using wet SCG:algae (1:1, w/w) at different temperatures, times, and solvent ratios. Box-Behnken quadratic model suggested 198 °C, 6 mL solvent g−1 biomass, and reaction time of 132 min as the optimum conditions for maximum biodiesel yield. At different SCG/microalgae blend ratios, pure microalgae showed the highest biodiesel yield of 20.15 wt%. Increase of SCG ratio resulted in significant reduction in the biodiesel yield, reaching the lowest value of 11.2 wt% using pure SCG. On the other hand, SCG showed better biodiesel characteristics than microalgae regarding iodine value, cetane number, and oxidation stability. The present results …

Authors

Abd El-Fatah Abomohra,Xuying Zheng,Qingyuan Wang,Jin Huang,Reham Ebaid

Journal

Bioresource Technology

Published Date

2021/3/1

Potential applications of Arthrospira platensis lipid-free biomass in bioremediation of organic dye from industrial textile effluents and its influence on Marine Rotifer …

Arthrospira platensis is one of the most important cultured microalgal species in the world. Arthrospira complete dry biomass (ACDB) has been reported as an interesting feedstock for many industries, including biodiesel production. The A. platensis by-product of biodiesel production (lipid-free biomass; LFB) is a source of proteins, functional molecules, and carbohydrates, and can also be reused in several applications. The current study investigated the efficiency of ACDB and LFB in bioremediation of dye (Ismate violet 2R, IV2R) from textile effluents. In addition, the potential of ACDB and LFB loaded by IV2R as a feed for Rotifer, Brachionus plicatilis, was examined. The surface of the adsorbents was characterized by SEM, FTIR, and Raman analysis to understand the adsorption mechanism. The batch sorption method was examined as a function of adsorbent dose (0.02–0.01 g L−1), solution initial concentration (10–100 mg L−1), pH (2–10), and contact time (15–180 min). The kinetic studies and adsorption isotherm models (Freundlich, Langmuir, Tempkin, and Halsey) were used to describe the interaction between dye and adsorbents. The results concluded that the adsorption process increased with increasing ACDB and LFB dose, contact time (120 min), initial IV2R concentration (10 mg L−1), and acidity pH (2 and 6, respectively). For the elimination of industrial textile wastewater, the ACDB and LFB sorbents have good elimination ability of a dye solution by 75.7% and 61.11%, respectively. The kinetic interaction between dye and adsorbents fitted well to Langmuir, Freundlish, and Halsey models for LFB, and Langmuir for ACDB at optimum …

Authors

Ahmed E Alprol,Ahmed MM Heneash,Mohamed Ashour,Khamael M Abualnaja,Dalal Alhashmialameer,Abdallah Tageldein Mansour,Zaki Z Sharawy,Mouhamed A Abu-Saied,Abd El-Fatah Abomohra

Journal

Materials

Published Date

2021/8/8

Catalytic co-pyrolysis of seaweeds and cellulose using mixed ZSM-5 and MCM-41 for enhanced crude bio-oil production

Catalytic co-pyrolysis of seaweed Enteromorpha clathrata (EN) and cellulose (CEL) with catalysts ZSM-5 and MCM-41 was investigated by TG, Py–GC/MS and fixed-bed experiments. The effects of temperature, catalysts, seaweed and cellulose ratio were examined on product yields distribution and bio-oil compositions by catalytic co-pyrolysis. The maximum bio-oil yield was recorded at the ratio of 1:1 (EN and CEL) with ZSM-5/MCM-41 at 500 °C on co-pyrolytic process. The interaction of radicals and faster heat transfer rate of EN/CEL induces the synergistic effects with catalysts. The advantage of mesoporous molecular sieve along with acidic microporous zeolite of ZSM-5/MCM-41 improved the cracking, dehydration, decarbonylation, decarboxylation, dealkylation, aromatization, oligomerization and deamination reactions. The overall study revealed that the amount of N-containing compounds were …

Authors

Yamin Hu,Haiwen Wang,Manogaran Lakshmikandan,Shuang Wang,Qian Wang,Zhixia He,Abd El-Fatah Abomohra

Journal

Journal of Thermal Analysis and Calorimetry

Published Date

2021/1

Microwave vacuum co-pyrolysis of waste plastic and seaweeds for enhanced crude bio-oil recovery: Experimental and feasibility study towards industrialization

Waste-to-energy is a promising approach to tackle the energy shortage and reduce the environmental pollution. The present study aimed to evaluate the technical and economic feasibility of microwave vacuum co-pyrolysis of seaweeds and low-density polyethylene (LDPE). Although the three studied seaweeds namely; Ulva intestinalis, Sargassum polycystum, and Hypnea valentiae showed similar thermal weight loss profile, U. intestinalis showed the highest biomass and bio-oil yields which resulted in superior bio-oil areal productivity of 30.1 g m−2. Therefore, it was selected for co-pyrolysis with LDPE at different blend ratios. Compared to individual pyrolysis of U. intestinalis, the increase inLDPE ratio enhanced the crude bio-oil production with simultaneous reduction in bio-char yield. The experimental bio-oil yields from co-pyrolysis showed higher values than the corresponding theoretical values, confirming a …

Authors

Abd El-Fatah Abomohra,Huda MA Sheikh,Amal H El-Naggar,Qingyuan Wang

Published Date

2021/10/1

Optimization of acid hydrolysis on the green seaweed Valoniopsis pachynema and approach towards mixotrophic microalgal biomass and lipid production

The dilute sulfuric acid hydrolysis was employed to optimize saccharification of the green seaweed Valoniopsis pachynema by response surface methodology (RSM) and the retrieved hydrolysates were characterized. The RSM quantitative evaluation of total sugar recovery on acid hydrolysates indicated that 3% dilute sulfuric acid was sufficient to retrieve optimum level of saccharification with 2.15 h incubation time at 60 °C. Fourier-transform infrared spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-Ray Analysis (EDAX) images of seaweed evidenced that seaweed surface polysaccharides were hydrolyzed by 3% dilute sulfuric acid, further this treatment showed improved polymer dissolution when compared to other concentrations. The acid treated seaweed pellets indicated effective colonization and encouraged growth in adhesion analysis of microalgae C. vulgaris MSU …

Authors

M Lakshmikandan,AG Murugesan,Shuang Wang,Abd El-Fatah Abomohra

Journal

Renewable Energy

Published Date

2021/2/1

Handbook of algal biofuels: aspects of cultivation, conversion, and biorefinery

Handbook of Algal Biofuels: Aspects of Cultivation, Conversion and Biorefinery comprehensively covers the cultivation, harvesting, conversion, and utilization of microalgae and seaweeds for different kinds of biofuels. The book addresses four main topics in the algal biofuel value-chain. First, it explores algal diversity and composition, covering micro-and macroalgal diversity, classification, and composition, their cultivation, biotechnological applications, current use within industry for biofuels and value-added products, and their application in CO2 sequestration, wastewater treatment, and water desalination. Next, the book addresses algal biofuel production, presenting detailed guidelines and protocols for different production routes of biodiesel, biogas, bioethanol, biobutanol, biohydrogen, jet fuel, and thermochemical conversation methods. Then, the authors discuss integrated approaches for enhanced biofuel production. This includes updates on the recent advances, breakthroughs, and challenges of algal biomass utilization as a feedstock for alternative biofuels, process intensification techniques, life cycle analysis, and integrated approaches such as wastewater treatment with CO2 sequestration using cost-effective and eco-friendly techniques. In addition, different routes for waste recycling for enhanced biofuel production are discussed alongside economic analyses. Finally, this book presents case studies for algal biomass and biofuel production including BIQ algae house, Renewable Energy Laboratory project, Aquatic Species Program, and the current status of algal industry for biofuel production. Handbook of Algal Biofuels offers an all-in …

Authors

Mostafa El-Sheekh,Abd El-Fatah Abomohra

Published Date

2021/12/2

Visible light-driven conversion of carboxylic acids into esters for enhanced algal bio-crude oil catalyzed by cadmium sulfide quantum dots (CdS-QDs)

This study investigated the application of cadmium sulfide quantum dots (CdS-QDs) as a photocatalyst to catalyze the conversion of carboxylic acids in the algal bio-crude oil into esters via visible light. The synthesized catalyst was characterized by SEM, TEM, BET, Raman, DRS, PL, and TG-DTA. The analysis of the algal bio-crude oil before and after photocatalytic reaction by gas chromatography‐mass spectrometry showed significant composition changes. The relative content of esters in algal bio-crude oil significantly increased from 17.22% to 47.92%, whereas the relative content of acids significantly reduced. The photocatalyst could selectively stimulate the cleavage of Csingle bondO linkages in carboxylic acids, leading to the generation of acyl radicals, and ultimately improved the relative content of esters.

Authors

Shuang Wang,Qian Liu,Ziyang Lu,Lingyan Xu,Xinlin Liu,Yamin Hu,Lili Qian,Shannan Xu,Abd El-Fatah Abomohra

Journal

Fuel Processing Technology

Published Date

2021/6/1

Explication of structural variations in the bacterial and archaeal community of anaerobic digestion sludges: An insight through metagenomics

Anaerobic digestion (AD) is a biological process, encompasses the treatment and stabilization of complex organic matter to extract renewable biomethane fuel through microbial interaction in the digester. The main aim of the current study is to investigate the microbial community of anaerobic digestion sludge (ADS), collected at different periods from a mesophilic operating anaerobic digester. The core group of bacteria in ADS including Firmicutes, Bacteroidetes, and Proteobacteria represented more than 60% of the core bacterial community. In ADS (I), the supremacy of Cloacimonetes (18%) was also observed. In ADS (II), the dominance of Anaerobacter (8%) showed the effect of substrate composition on the microbial structure. However, 91% relative abundance of Firmicutes was observed in ADS (III). The hydrogenotrophic methanogens belonging to order Methanomicrobiales and Methanobacteriales exhibited …

Authors

Adel I Alalawy,Zhaodi Guo,Fahad M Almutairi,Haddad A El Rabey,Mohammed A Al-Duais,Ghena M Mohammed,Fahad M Almasoudi,Maeidh A Alotaibi,El-Sayed Salama,Abd El-Fatah Abomohra,Mohamed I Sakran

Journal

Journal of Environmental Chemical Engineering

Published Date

2021/10/1

Recent progress in genetically modified microalgae for enhanced carbon dioxide sequestration

Reducing carbon dioxide (CO2) emissions has been a hot research topic in recent years. The integration of microalgae cultivation using CO2 from power plants and factories has been introduced as an environmentally friendly approach. However, strains with high biomass productivity are required to achieve a sustainable integrated platform. Improving photosynthesis is critical to increase both biomass productivity and CO2 sequestration efficiency. The improvement of photosynthesis is often attained by enhancing the efficiency of enzymes that are involved in CO2 fixation, reducing the antenna size to avoid energy loss, extending the photosynthetically active radiation range to broaden the light utilization capacity, increasing CO2 assimilation by replacing the existing carbon fixation pathway with more efficient pathways and enzymes, and reducing the release of captured CO2. Implementation of these modifications …

Authors

Bahram Barati,Kuo Zeng,Jan Baeyens,Shuang Wang,Min Addy,Sook-Yee Gan,Abd El-Fatah Abomohra

Published Date

2021/2/1

Life cycle assessment and impact correlation analysis of fly ash geopolymer concrete

Geopolymer concrete (GPC) has drawn widespread attention as a universally accepted ideal green material to improve environmental conditions in recent years. The present study systematically quantifies and compares the environmental impact of fly ash GPC and ordinary Portland cement (OPC) concrete under different strength grades by conducting life cycle assessment (LCA). The alkali activator solution to fly ash ratio (S/F), sodium hydroxide concentration (CNaOH), and sodium silicate to sodium hydroxide ratio (SS/SH) were further used as three key parameters to consider their sensitivity to strength and CO2 emissions. The correlation and influence rules were analyzed by Multivariate Analysis of Variance (MANOVA) and Gray Relational Analysis (GRA). The results indicated that the CO2 emission of GPC can be reduced by 62.73%, and the correlation between CO2 emission and compressive strength is not significant for GPC. The degree of influence of the three factors on the compressive strength is CNaOH (66.5%) > SS/SH (20.7%) > S/F (9%) and on CO2 emissions is S/F (87.2%) > SS/SH (10.3%) > CNaOH (2.4%). Fly ash GPC effectively controls the environmental deterioration without compromising its compressive strength; in fact, it even in favor.

Authors

Xiaoshuang Shi,Cong Zhang,Yongchen Liang,Jinqian Luo,Xiaoqi Wang,Ying Feng,Yanlin Li,Qingyuan Wang,Abd El-Fatah Abomohra

Journal

Materials

Published Date

2021/12/1

Accelerated carbonation technology for enhanced treatment of recycled concrete aggregates: A state-of-the-art review

The accelerated carbonation technology has been utilized in order to enhance the properties of the recycled concrete aggregates (RCAs) and efficient sequestration of carbon dioxide. Numerous studies have been conducted on this developing technology, while there are few systematic reviews on this method. In the present paper, the reaction processes, influencing factors and mechanisms of the accelerated carbonation to treat RCAs are summarized. The quality of carbonated RCAs and the properties of concrete incorporating carbonated RCAs are evaluated. Moreover, the environmental impacts and economic feasibility of this technique are analyzed. Results showed that carbon dioxide could react with calcium hydroxide, calcium silicate hydrates and other calcium substances in RCAs leading to the precipitation of calcium carbonate. The carbonation processes were mainly determined by carbonation …

Authors

Yunhui Pu,Lang Li,Qingyuan Wang,Xiaoshuang Shi,Chenchen Luan,Guomin Zhang,Ling Fu,Abd El-Fatah Abomohra

Published Date

2021/5/3

Integrated approach for enhanced bio-oil recovery from disposed face masks through co-hydrothermal liquefaction with Spirulina platensis grown in wastewater

Currently, the enormous generation of contaminated disposed face masks raises many environmental concerns. The present study provides a novel route for efficient crude bio-oil production from disposed masks through co-hydrothermal liquefaction (Co-HTL) with Spirulina platensis grown in wastewater. Ultimate and proximate analysis confirmed that S. platensis contains relatively high nitrogen content (9.13%dw), which decreased by increasing the mask blend ratio. However, carbon and hydrogen contents were higher in masks (83.84 and 13.77%dw, respectively). In addition, masks showed 29.6% higher volatiles than S. platensis, which resulted in 94.2% lower ash content. Thermal decomposition of masks started at a higher temperature (≈330 °C) comparing to S. platensis (≈208 °C). The highest bio-oil yield was recorded by HTL of S. platensis and Co-HTL with 25% (w/w) masks at 300 °C, which …

Authors

Li Li,Jin Huang,Adel W Almutairi,Xin Lan,Linling Zheng,Yuling Lin,Liudong Chen,Nanjie Fu,Zongren Lin,Abd El-Fatah Abomohra

Journal

Biomass conversion and biorefinery

Published Date

2021/9/25

A sustainable approach for bioconversion of food and lignocellulosic wastes into liquid biofuel using a new Metschnikowia pulcherrima isolate

In the present study, valorization of food and lignocellulosic wastes into biodiesel and 2‐phenylethanol using Metchinikowia pulcherrima isolated from rotten food wastes was evaluated. At the optimum pH of 5.5, food waste hydrolysate (FWH) showed 74.1% higher dry weight than the corresponding synthetic medium. Rice straw (RS) and softwood sawdust (WWA) were used as additional carbon sources to increase the C:N ratio of FWH. WWA enhanced the biomass production by 23.3% and 55.9% over the corresponding RS and FWH, respectively; while RS enhanced lipid accumulation. Due to enhancement of growth, 75 g WWA showed the maximum recorded lipid productivity of 2.49 g L−1 d−1. Interestingly, both hexoses and pentoses were effectively metabolized. Regarding fatty acid profile of M. pulcherrima, RS‐ and WWA‐enriched growth media showed higher saturated fatty acids proportions (56.9 …

Authors

Abd El‐Fatah Abomohra,Qingyuan Wang,Jin Huang,Khalil M Saad‐Allah

Journal

International Journal of Energy Research

Published Date

2021/2

Valorization of lipidic food waste for enhanced biodiesel recovery through two-step conversion: A novel microalgae-integrated approach

The present study designed an innovative route for two-step biodiesel recovery from lipidic food waste followed by microalgae cultivation. Optimization of oil conversion showed the highest fatty acid methyl esters (FAMEs) recovery of 92.6% (lipid basis). Microalgal lipid accumulation enhanced by the increased lipid-free waste hydrolysate ratio in the medium, where the maximum lipid content of 26.2 dw% was recorded using 50% hydrolysate. Application of 30% hydrolysate ratio resulted in the maximum recorded lipid productivity, which was 99.4% higher than that of the control and insignificant with 40% hydrolysate. Waste oil-derived FAMEs showed 69.0% higher saturated fatty acids (SFAs) proportion than that of algal lipids. In contrast, the highest polyunsaturated fatty acids (PUFAs) proportion (48.8% of total fatty acids) was recorded in microalgal lipids. The study concluded that mixing microalgal lipids with waste …

Authors

Adel W Almutairi,Zaki M Al-Hasawi,Abd El-Fatah Abomohra

Journal

Bioresource Technology

Published Date

2021/12/1

Biogas: Recent Advances and Integrated Approaches

Anaerobic digestion (AD) is by far the most important technology for providing clean renewable energy to millions in rural areas of many developing countries. AD of biowastes produces both biomethane and anaerobic digestate as a byproduct that can be used further as a biofertilizer. Biowastes including sewage, food processing wastes, animal wastes, and lignocellulosic wastes typically produce biogas containing 55%–70% biomethane. In the context of energy consumption, more than 85% of the total energy consumed currently comes from non-renewable fossil resources. Biogas technology can provide sustainable, affordable, and eco-friendly energy through waste recycling. This book provides basic knowledge and recent research on biogas production, focusing on the enhancement of biomethane and production routes integrated with microalgae cultivation or agriculture.

Authors

Abd El-Fatah Abomohra,Mahdy Elsayed,Zuzeng Qin,Hongbing Ji,Zili Liu

Published Date

2021/4/28

Sequential bioethanol and biogas production coupled with heavy metal removal using dry seaweeds: Towards enhanced economic feasibility

Seaweeds have been used in many biotechnological applications including animal feed, human food, cosmetics, fertilizers, and bioremediation. With respect to bioremediation, seaweeds contaminated with heavy metals have limited applications and most suited for biofuel production. The present study aimed to evaluate the potential of seaweeds for dual use in heavy metal biosorption and biofuel production. Three dominant seaweed genera were collected representing the three macroalgal phyla, namely Ulva spp. (Chlorophyte), Gracilaria spp. (Rhodophyte), and Sargassum spp. (Phaeophyte). The later showed the highest cumulative copper (Cu2+) biosorption with 80% removal efficiency, which increased to 94.6% after process optimization. Comparative fermentation of raw biomass (RB) and Cu-sorbed biomass (BHM) showed the highest bioethanol yield of 289.2 mg g−1 for RB at 72 h fermentation, which was …

Authors

Abd El-Fatah Abomohra,Mohamed E El-Hefnawy,Qingyuan Wang,Jin Huang,Li Li,Jialing Tang,Soha Mohammed

Journal

Journal of Cleaner Production

Published Date

2021/9/20

A novel bifunctional aldehyde/alcohol dehydrogenase catalyzing reduction of acetyl-CoA to ethanol at temperatures up to 95° C

Hyperthermophilic Thermotoga spp. are excellent candidates for the biosynthesis of cellulosic ethanol producing strains because they can grow optimally at 80 °C with ability to degrade and utilize cellulosic biomass. In T. neapolitana (Tne), a putative iron-containing alcohol dehydrogenase was, for the first time, revealed to be a bifunctional aldehyde/alcohol dehydrogenase (Fe-AAdh) that catalyzed both reactions from acetyl-coenzyme A (ac-CoA) to acetaldehyde (ac-ald), and from ac-ald to ethanol, while the putative aldehyde dehydrogenase (Aldh) exhibited only CoA-independent activity that oxidizes ac-ald to acetic acid. The biochemical properties of Fe-AAdh were characterized, and bioinformatics were analyzed. Fe-AAdh exhibited the highest activities for the reductions of ac-CoA and acetaldehyde at 80–85 °C, pH 7.54, and had a 1-h half-life at about 92 °C. The Fe-AAdh gene is highly conserved in …

Authors

Qiang Wang,Chong Sha,Hongcheng Wang,Kesen Ma,Juergen Wiegle,Abd El-Fatah Abomohra,Weilan Shao

Journal

Scientific Reports

Published Date

2021/1/13

Technologies for Water Quality and Wastewater Management in Developing Countries

Demand for water resources has increased dramatically as a result of population and economic expansion. Consequently, 36% of the world’s population now lives in water-stressed areas. Rapid urbanization, particularly in low-and middle-income nations, has caused a slew of water-related issues, such as degradation of water quality, insufficient water supply and sanitation facilities, and the rise of suburban and informal settlements. Good water quality is essential for human health, socio-economic development and ecosystems. However, as the population grows and the natural environment deteriorates, it becomes increasingly difficult to ensure adequate and safe water supply for all. A predominant part of the answer is to lessen pollutants and enhance wastewater control practices. Water must be properly managed throughout the water cycle, from freshwater withdrawal, pretreatment, distribution, usage, collection …

Authors

B Deepanraj,R Sivashankar,AM Saravanan,P Abdul Salam,Abd El-Fatah Abomohra

Published Date

2021/11/15

Potential of fat, oil and grease (FOG) for biodiesel production: A critical review on the recent progress and future perspectives

Wastewater discharges from restaurants, kitchens, food processing plants and slaughterhouses contain high proportion of fat, oil, and grease (FOG). Critical overview on the attractive features, current state, and needed advancements are timely essential for FOG-derived biodiesel production. Although FOG conversion into biodiesel does not compete with human food, the high contents of moisture and free fatty acids (FFAs) are the main challenges for FOG efficient utilization. The present review discussed the various methods of high FFAs-lipidic feedstocks pretreatment including acid esterification, steam stripping, nanocatalytic technology, biological conversion, glycerolysis, supercritical esterification, and simultaneous in situ conversion. Comparing to other feedstocks, FOG-derived biodiesel showed better characteristics concerning oxidative stability, flash point, cetane number, and total emissions. In addition …

Authors

Abd El-Fatah Abomohra,Mahdy Elsayed,Sivakumar Esakkimuthu,Mostafa El-Sheekh,Dieter Hanelt

Published Date

2020/11/1

A state-of-the-art review on dual purpose seaweeds utilization for wastewater treatment and crude bio-oil production

Due to the negative environmental impacts of fossil fuels and the increasing global energy demands, biofuels are receiving increasing attention as the best short-term substitute for petroleum. Recently, thermochemical conversion of seaweeds is in industrial focus to obtain high-value products with more potential applications than the conventional raw material. Beside biofuel production and due to their autotrophic growth, seaweeds are receiving a great attention in the field of bioremediation. Thus, pyrolysis of seaweeds is a promising approach for renewable bio-oil production with positive environmental impacts. However, a pretreatment drying step is required to improve the conversion process of the biomass. Application of electro-osmotic dewatering as well as on-site mechanical dewatering methods prior to the drying process were reported as useful techniques to reduce the energy requirements. On the other …

Authors

Shuang Wang,Shuang Zhao,Benjamin Bernard Uzoejinwa,Anqing Zheng,Qingyuan Wang,Jin Huang,Abd El-Fatah Abomohra

Published Date

2020/10/15

The therapeutic potential of spirulina to combat COVID-19 infection

MANY countries and labs are currently looking for a COVID-19 vaccine but have yet to explore it. Many species of Spirulina contain significant active compounds such as sulfated polysaccharides, phenols, phycobiliproteins, and calcium spirulan with inhibition activity against replication of viruses, especially influenza A (H1N1), HCV , and HIV viral infection. As there is no vaccine was approved against COVID-19, the potential of using Spirulina as antivirus and an immune agent has been tested for many viruses, and this encourages using the Spirulina as a whole amount or its extract for immunization against COVID-19, the causative pathogen of Coronavirus disease. The present article discusses some of the important studies on the therapeutic antiviral activities of the cyanobacterium Spirulina platensis.

Authors

Mostafa El-Sheekh,Abd El-Fatah Abomohra

Journal

Egyptian Journal of Botany

Published Date

2020/12/1

A close-loop integrated approach for microalgae cultivation and efficient utilization of agar-free seaweed residues for enhanced biofuel recovery

The aim of this work was to evaluate a novel integrated biorefinery route for enhanced energy recovery from seaweeds and microalgae. Agar extraction prior to anaerobic digestion recorded the highest biogas productivity of 32.57 L kg−1 VS d−1. Supplementation of the microalgal growth medium with anaerobic digestate from agar-extracted biomass enhanced the microalgal growth, recording the highest dry weight of 4.57 g L−1 at 20% digestate ratio. In addition, lipid content showed the highest value of 25.8 %dw. Due to enhancement of growth and lipid content, 20% digestate ratio showed the highest lipid productivity and FAMEs recovery (65.2 mg L−1 d−1 and 123.3 mg g−1dw, respectively), with enhanced biodiesel characteristics. The present study estimated annual revenue of 1252.7 US$ ton−1 from the whole Gracilaria multipartita biomass conversion into biogas, while that through agar extraction deserved …

Authors

Abd El-Fatah Abomohra,Adel W Almutairi

Journal

Bioresource Technology

Published Date

2020/12/1

Study on the co-operative effect of kitchen wastewater for harvest and enhanced pyrolysis of microalgae

Microalgae biofuels have received extensive attention as a new generation of renewable energy. However, the cost of cultivation and harvest limits the large-scale use of microalgae. An innovative method for harvesting microalgae through flocculation using kitchen wastewater (KWW) and further co-pyrolysis to enhance the crude bio-oil production was proposed. Flocculation efficiency of KWW for Scenedesmus obliquus showed the highest value of 94.09%. Compared with centrifugation and chemical flocculation (CF), the thermogravimetric curve of the sample after KWW flocculation showed different pattern. In addition, bio-oil yield of microalgae harvested through KWW flocculation was also the highest among the three studied harvest methods, reaching 55.59%. Gas chromatographic mass spectrometry (GC–MS) analysis of bio-oil showed that addition of KWW could promote the production of esters and …

Authors

Shuang Wang,Shuanhu Hu,Hao Shang,Bahram Barati,Xun Gong,Xun Hu,Abd El-Fatah Abomohra

Journal

Bioresource Technology

Published Date

2020/12/1

See List of Professors in Abdelfatah Abomohra University(Tanta University)

Abdelfatah Abomohra FAQs

What is Abdelfatah Abomohra's h-index at Tanta University?

The h-index of Abdelfatah Abomohra has been 48 since 2020 and 49 in total.

What are Abdelfatah Abomohra's top articles?

The articles with the titles of

Thermophilic β-mannanases from bacteria: production, resources, structural features and bioengineering strategies

Sustainable valorization of waste glycerol into bioethanol and biodiesel through biocircular approaches: A review

Lipid-rich particles of processed food waste for microalgae harvest through lipid-enriched floating biomat formation

Integrated municipal wastewater treatment and lipid accumulation by a self-flocculating/floating microalga Limnothrix sp.

A comprehensive review on the intricate processes involved in algae pyrolysis mechanism and possible migration of undesirable chemical elements

Valorization of floral foam waste via pyrolysis optimization for enhanced phenols recovery

Response surface optimization of product yields and biofuel quality during fast hydrothermal liquefaction of a highly CO2-tolerant microalgae

Optimization of biomass and fatty acid productivity of Desmodesmus intermedius as a promising microalga for biodiesel production

...

are the top articles of Abdelfatah Abomohra at Tanta University.

What are Abdelfatah Abomohra's research interests?

The research interests of Abdelfatah Abomohra are: Phycology, Environmental Engineering, Biofuel, Waste recycling

What is Abdelfatah Abomohra's total number of citations?

Abdelfatah Abomohra has 7,366 citations in total.

What are the co-authors of Abdelfatah Abomohra?

The co-authors of Abdelfatah Abomohra are Xun Hu, Mohamed A. El-Esawi, Mostafa El-Sheekh, El-Sayed Salama, Ph.D., Mostafa Elshobary ORCID:0000-0002-2131-0679, Sivakumar Esakkimuthu.

    Co-Authors

    H-index: 71
    Xun Hu

    Xun Hu

    Curtin University

    H-index: 48
    Mohamed A. El-Esawi

    Mohamed A. El-Esawi

    Tanta University

    H-index: 46
    Mostafa El-Sheekh

    Mostafa El-Sheekh

    Tanta University

    H-index: 38
    El-Sayed Salama, Ph.D.

    El-Sayed Salama, Ph.D.

    Lanzhou University

    H-index: 20
    Mostafa Elshobary ORCID:0000-0002-2131-0679

    Mostafa Elshobary ORCID:0000-0002-2131-0679

    Tanta University

    H-index: 16
    Sivakumar Esakkimuthu

    Sivakumar Esakkimuthu

    Jiangsu University

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