Effect of H-2 addition on the microbial community structure of a mesophilic anaerobic digestion system
文献类型： 外文期刊
作者： Zhu, Xianpu 1 ; Chen, Liumeng 2 ; Chen, Yichao 1 ; Cao, Qin 1 ; Liu, Xiaofeng 1 ; Li, Dong 1 ;
作者机构： 1.Chinese Acad Sci, Key Lab Environm & Appl Microbiol, Environm Microbiol Key Lab Sichuan Prov, Chengdu Inst Biol, Chengdu 610041, Peoples R China
2.Jiangxi Acad Agr Sci, Inst Appl Agr Microorganism, Nanchang 330200, Jiangxi, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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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