Enhanced coal biomethanation by microbial electrolysis and graphene in the anaerobic digestion

The combination of microbial electrolytic cells and conductive materials can effectively promote direct interspecies electron transfer (DIET) to increase methane production, which has great potential for enhanced anaerobic degradation of organic matter. A single-chamber microbial electrolytic cell c...

Full description

Saved in:
Bibliographic Details
Published in:Renewable energy 2023-12, Vol.219, p.119527, Article 119527
Main Authors: Zhou, Yixuan, Su, Xianbo, Zhao, Weizhong, Wang, Lufei, Fu, Haijiao
Format: Article
Language:English
Subjects:
acetogens
anaerobic digestion
Anaerovorax
biogas
carbon dioxide
coal
electric field
electrolysis
electron transfer
genes
Geobacter
graphene
methane production
methanogens
Methanosarcina
organic matter
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The combination of microbial electrolytic cells and conductive materials can effectively promote direct interspecies electron transfer (DIET) to increase methane production, which has great potential for enhanced anaerobic degradation of organic matter. A single-chamber microbial electrolytic cell containing graphene was constructed using long-flame coal as a substrate. The results showed that the external electric field and graphene increased the abundance of hydrolytic bacteria (Paraclostridium, Sedimentibacter) and hydrogen-producing acetogenic bacteria (Anaerovorax) in the AD system. The consumption rate of alkanes, volatile fatty acids and alcohols was accelerated, which provided sufficient nutrients for methanogens and increased biomethane production by 53.1 %. The abundance of related genes involved in the carbon dioxide reduction pathway was significantly increased. The abundance of pilA gene involved in electron transport in the AD system increased by 153.7 %, and the abundance of electroactive microorganisms Geobacter and Methanosarcina capable of DIET increased significantly, which further promoted coal biomethanation.
ISSN:0960-1481
DOI:10.1016/j.renene.2023.119527