The role of conductive materials in the start-up period of thermophilic anaerobic system

Bioresource Technology
Wangwang YanYan Zhou

Abstract

The major obstacle for thermophilic anaerobic digestion (TAD) is the inhibited microorganism activity and process instability during the start-up period. This study proposed a strategy to accelerate and stabilize the thermophilic reactors start-up via adding conductive materials. The results show that methane production rate in conductive materials supplemented (CMS) reactors was almost two times higher than the control reactors. Caloramator sp., a candidate of electroactive bacteria, was significantly enriched in the carbon nano-tube (CNT) supplemented groups (12.89%) as compared to control groups (1.26% only). Together with the doubled abundance of Methanosaeta and Methanosarcina methanogens in CMS groups, it is highly possible Caloramator sp. and Methanosaeta/Methanosarcina have established syntrophic direct interspecies electron transfer (DIET), via adopting conductive materials as electron conduit. Microbial community analysis indicates DIET was likely to be an unstable condition triggered syntrophic process. This study demonstrated that conductive materials could promote microbial activity and shorten start-up period for thermophilic anaerobic system.

Citations

Apr 25, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Qi HuangBipro Ranjan Dhar
May 12, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Bing GuoYang Liu
Jan 17, 2021·Trends in Biotechnology·Richen LinJerry D Murphy
Nov 17, 2019·Bioresource Technology·Wangwang YanYan Zhou
Mar 21, 2021·Bioresource Technology·Wei Wang, Duu-Jong Lee
Aug 18, 2018·Environmental Science & Technology·Gilberto MartinsM Madalena Alves
Aug 11, 2020·Journal of Colloid and Interface Science·Na ZhouZhanhu Guo

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