Effect of H-2 addition on the microbial community structure of a mesophilic anaerobic digestion system

文献类型： 外文期刊

第一作者： Zhu, Xianpu

作者： Zhu, Xianpu;Chen, Yichao;Cao, Qin;Liu, Xiaofeng;Li, Dong;Chen, Liumeng;Zhu, Xianpu

作者机构：

关键词： Anaerobic digestion; In-situ biogas upgrading; Microbial community structure; Continuous mixing; Homoacetogens; Acetoclastic methanogens

期刊名称：ENERGY （ 影响因子：7.147； 五年影响因子：6.845 ）

ISSN： 0360-5442

年卷期： 2020 年 198 卷

页码：

收录情况： SCI

摘要： In situ biogas upgrading by H-2 addition is a promising technology to increase the calorific value of biogas;however, its effects on microbial community structure remain unclear. Therefore, mesophilic digestion of swine manure was carried out in a reactor with an H-2 addition rate of 7.2 mL/min (at a 4:1H(2): CO2 ratio) and an organic loading rate of 2.0 g of volatile solids (VS)/(L.d). After H-2 was injected into the reactor, the maximum average methane yield increased from 189 to 245 L/kg VS under intermittent mixing conditions. The acetate concentration increased to a maximum of 1600 mg/L but the methane yield was reduced to 210 L/kg VS, which was attributed to a reduction in acetoclastic methanogen abundance in the system due to continuous mixing. The combination of homoacetogenic Clostridium and the Methanosaeta acetoclastic methanogens instead of hydrogenotrophic methanogens appears to have played a vital role in converting the added H-2 into CH4 in the mesophilic reactor. However, hydrogenotrophic methanogens accounted for approximately 10% of the total metabolic activity while having a relative abundance of less than 0.5% among the methanogens, after the acetoclastic were inhibited. (C) 2020 Elsevier Ltd. All rights reserved.

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