Evaluation on direct interspecies electron transfer in anaerobic sludge digestion of microbial electrolysis cell.
Evaluation on direct interspecies electron transfer in anaerobic sludge digestion of microbial electrolysis cell.
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DOI：
10.1016/j.biortech.2015.10.021
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发表时间：
2016
影响因子：
11.4
通讯作者：
Zisheng Zhao;Yaobin Zhang;X. Quan;Huimin Zhao
中科院分区：
文献类型：
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作者：
Zisheng Zhao;Yaobin Zhang;X. Quan;Huimin Zhao
产甲烷微生物电解池 (MEC) 中产甲烷量的增加通常被认为是 CO2 阴极还原的结果。最近的研究表明，这种电产甲烷作用仅占厌氧污泥消化过程中甲烷产量的一小部分。相反，直接种间电子转移（DIET）可能在甲烷生产中发挥重要作用。本研究在单室MEC反应器、碳毡补充反应器和普通厌氧反应器中研究了污泥的厌氧消化，以评估DIET对污泥消化的影响。结果表明，在反应器中添加碳毡可使甲烷产量增加12.9%，污泥减少量增加17.2%。在碳毡上施加电压进一步改善了消化。目前的计算表明，阴极还原仅贡献了增加的甲烷产量的27.5%。微生物分析表明，DIET在MEC厌氧污泥消化中发挥着重要作用。
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.