Journal article
Enhancement of methane production from waste activated sludge using hybrid microbial electrolysis cells-anaerobic digestion (MEC-AD) process-A review
Technical University of Denmark1
Department of Mechanical Engineering, Technical University of Denmark2
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark3
Department of Environmental Engineering, Technical University of Denmark4
Water Technology & Processes, Department of Environmental Engineering, Technical University of Denmark5
Harbin Institute of Technology6
National Taiwan University7
Hybrid microbial electrolysis cells-anaerobic digestion (MEC-AD) was proved to increase methane productivity and methane yield of waste activated sludge (WAS) by establishing direct interspecies electron transfer method and enriching functional microorganisms. This review first summarized the pretreatment methods of WAS for MEC-AD and then reviewed the reactor configurations, operation parameters, and the economic benefit of MEC-AD.
Furthermore, the enhancement mechanisms of MEC-AD were reviewed based on the analysis of thermodynamics and microbial community. It was found that the decrease of hydrogen partial pressure due to the hydrogenotrophic methanogens enriched in cathodic biofilm and direct interspecies electron transfer between exoelectrogens and anode were the core mechanisms for improving acidogenesis, acetogenesis, and methanogenesis.
Finally, the potentially technological issues that need to be addressed to increase energy efficiency in large-scale MEC-AD processes were discussed.
Language: | English |
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Year: | 2022 |
Pages: | 126641 |
ISSN: | 18732976 and 09608524 |
Types: | Journal article |
DOI: | 10.1016/j.biortech.2021.126641 |
ORCIDs: | Wang, Bo and Wang, Song |
Anaerobic digestion Enhancing Mechanism Methane production Microbial community Microbial electrolysis cell SDG 7 - Affordable and Clean Energy Waste activated sludge
Anaerobiosis Bioreactors Electrolysis Enhancing mechanism Methane Sewage