期刊
ENVIRONMENTAL POLLUTION
卷 272, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.116030
关键词
Anaerobic digestion; Biomethane; Carbon cloth; Direct interspecies electron transfer
资金
- National Natural Science Foundation of China [51876016]
- State Key Program of National Natural Science of China [51836001]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2019040]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Fundamental Research Funds for the Central Universities [2018CDPTCG0001/18, 2020CDJQY-A054]
The addition of conductive carbon cloth improved the anaerobic digestion of wastewater rich in VFAs, preventing digestion failure and enhancing methane production by 200-260% with significantly improved COD removal efficiency. The presence of exoelectrogens and electrotrophic methanogens on the carbon cloth promoted direct interspecies electron transfer and methane production.
The anaerobic digestion of wastewater rich in volatile fatty acids (VFAs) provides a sustainable approach for methane production whilst reducing environmental pollution. However, the anaerobic digestion of VFAs may not be stable during long-term operation under a short hydraulic retention time. In this study, conductive carbon cloth was supplemented to investigate the impacts on the anaerobic digestion of VFAs in wastewater sourced from dark fermentation. The results demonstrated that the failure of anaerobic digestion could be avoided when carbon cloth was supplemented. In the stable stage, the methane production rate with carbon cloth supplementation was improved by 200-260%, and the chemical oxygen demand (COD) removal efficiency was significantly enhanced compared with that in the control without carbon cloth. The relative abundance of potential exoelectrogens on the carbon cloth was increased by up to 8-fold compared with that in the suspension. Electrotrophic methanogens on the carbon cloth were enriched by 4.2-17.2% compared with those in the suspension. The genera Ercella and Petrimonas along with the methanogenic archaea Methanosaeta and Methanosarcina on the carbon cloth may facilitate direct interspecies electron transfer, thereby enhancing methane production. (C) 2020 Elsevier Ltd. All rights reserved.
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