Enhancement of methane production from waste activated sludge using hybrid microbial electrolysis cells-anaerobic digestion (MEC-AD) process-A review

Xue-Ting Wang, Yi-Feng Zhang, Bo Wang, Song Wang, Xue Xing, Xi-Jun Xu, Wen-Zong Liu, Nan-Qi Ren, Duu-Jong Lee, Chuan Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
Article number126641
JournalBioresource Technology
Volume346
Number of pages10
ISSN0960-8524
DOIs
Publication statusPublished - 2022

Keywords

  • Methane production
  • Waste activated sludge
  • Microbial electrolysis cell
  • Anaerobic digestion
  • Enhancing Mechanism
  • Microbial community

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