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Fat,oil,and grease as new feedstock towards bioelectrogenesis in microbial fuel cells:Microbial diversity,metabolic pathways,and key enzymes

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Journal of Energy Chemistry 2023年第10期85卷 418-429,I0011页

作者： Monika Sharma Mohammed Jalalah Saeed AAlsareii farid aharraz Abdulrhman AAlmadiy Nandini Thakur El-Sayed Salama Xiangkai Li MOE Key Laboratory of Cell Activities and Stress AdaptationsSchool of Life SciencesLanzhou UniversityLanzhou 730000GansuChina Promising Centre for Sensors and Electronic Devices(PCSED) Advanced Materials and Nano-Research CentreNajran UniversityP.O.Box:1988Najran 11001Saudi Arabia Department of Electrical Engineering College of EngineeringNajran UniversityNajran 11001Saudi Arabia Department of Surgery College of MedicineNajran UniversityNajran 11001Saudi Arabia Department of Chemistry Faculty of Science and Arts at SharurahNajran UniversitySharurah 68342Saudi Arabia Department of Biology Faculty of Arts and SciencesNajran University1988 NajranSaudi Arabia Department of Occupational and Environmental Health School of Public HealthLanzhou UniversityLanzhou 730000GansuChina

Microbial fuel cells(MFCs)are a well-known technology used for bioelectricity production from the decomposition of organic waste via electroactive microbes.Fat,oil,and grease(FOG)as a new substrate in the anode and microalgae in the cathode were added to accelerate the electrogenesis.The effect of FOG concentrations(0.1%,0.5%,1%,and 1.5%)on the anode chamber was investigated.The FOG degradation,volatile fatty acid(VFAs)production,and soluble chemical oxygen demand along with voltage output kinetics were analyzed.Moreover,the microbial community analysis and active functional enzymes were also evaluated.The maximum power and current density were observed at 0.5%FOG which accounts for 96 mW m^(-2)(8-folds enhancement)and 560 mA m^(-2)(3.7-folds enhancement),respectively.The daily voltage output enhanced upto 2.3-folds with 77.08%coulombic efficiency under 0.5%FOG,which was the highest among all the reactors.The 0.5%FOG was degraded>85%,followed by a 1%FOG-loaded reactor.The chief enzymes inβ-oxidation and electrogenesis were acetyl-CoA C-acetyltransferase,riboflavin synthase,and riboflavin kinase.The identified enzymes symbolize the presence of Clostridium sp.(>15%)and Pseudomonas(>10%)which served as electrochemical active bacteria(EAB).The major metabolic pathways involved in electrogenesis and FOG degradation were fatty acid biosynthesis and glycerophospholipid metabolism.Utilization of lipidic-waste(such as FOG)in MFCs could be a potential approach for simultaneous biowaste utilization and bioenergy generation.

关键词： Lipidic-waste Microalgae Electrogenesis Microbial community Functional enzymes

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