点击次数：

论文类型：期刊论文

发表时间：2016-01-01

发表刊物：BIORESOURCE TECHNOLOGY

收录刊物：SCIE、EI、PubMed、ESI高被引论文

卷号：200

页面范围：235-244

ISSN号：0960-8524

关键字：Microbial electrolysis cells; Anaerobic sludge digestion; Direct interspecies electron transfer; Conductive materials

摘要：Increase of methanogenesis in methane-producing microbial electrolysis cells (MECs) is frequently believed as a result of cathodic reduction of CO2. Recent studies indicated that this electromethanogenesis only accounted for a little part of methane production during anaerobic sludge digestion. Instead, direct interspecies electron transfer (DIET) possibly plays an important role in methane production. In this study, anaerobic digestion of sludge were investigated in a single-chamber MEC reactor, a carbon-felt supplemented reactor and a common anaerobic reactor to evaluate the effects of DIET on the sludge digestion. The results showed that adding carbon felt into the reactor increased 12.9% of methane production and 17.2% of sludge reduction. Imposing a voltage on the carbon felt further improved the digestion. Current calculation showed that the cathodic reduction only contributed to 27.5% of increased methane production. Microbial analysis indicated that DIET played an important role in the anaerobic sludge digestion in the MEC. (C) 2015 Elsevier Ltd. All rights reserved.