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Effect of H2 addition on the microbial community structure of a mesophilic anaerobic digestion system

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  • Zhu, Xianpu
  • Chen, Liumeng
  • Chen, Yichao
  • Cao, Qin
  • Liu, Xiaofeng
  • Li, Dong

Abstract

In situ biogas upgrading by H2 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 H2 addition rate of 7.2 mL/min (at a 4:1H2: CO2 ratio) and an organic loading rate of 2.0 g of volatile solids (VS)/(L∙d). After H2 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 H2 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.

Suggested Citation

  • Zhu, Xianpu & Chen, Liumeng & Chen, Yichao & Cao, Qin & Liu, Xiaofeng & Li, Dong, 2020. "Effect of H2 addition on the microbial community structure of a mesophilic anaerobic digestion system," Energy, Elsevier, vol. 198(C).
    • Handle: RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304758
    DOI: 10.1016/j.energy.2020.117368
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    References listed on IDEAS

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