Journal
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
Volume 46, Issue 11, Pages 1569-1581Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10295-019-02219-w
Keywords
In situ biogas upgrading; Homoacetogens; Strict aceticlastic methanogens; Hydrogenotrophic methanogens; Syntrophic acetate-oxidizing bacteria
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Funding
- National Key R & D Program of China [2018YFD0501405]
- West Light Foundation of Chinese Academy of Sciences [2018XBZG_XBQNXZ_A_004]
- Youth Innovation Promotion Association of CAS [2017423]
- Key projects for foreign cooperation of International Cooperation Bureau of Chinese Academy of Sciences [182344KYSB20170009]
- Science and Technology Service Network Initiative (STS) of CAS [KFJ-STS-QYZD-117]
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To investigate the differences in microbial community structure between mesophilic and thermophilic in situ biogas-upgrading systems by H-2 addition, two reactors (35 degrees C and 55 degrees C) were run for four stages according to different H-2 addition rates (H-2/CO2 of 0:1, 1:1, and 4:1) and mixing mode (intermittent and continuous). 16S rRNA gene-sequencing technology was applied to analyze microbial community structure. The results showed that the temperature is a crucial factor in impacting succession of microbial community structure and the H-2 utilization pathway. For mesophilic digestion, most of added H-2 was consumed indirectly by the combination of homoacetogens and strict aceticlastic methanogens. In the thermophilic system, most of added H-2 may be used for microbial cell growth, and part of H-2 was utilized directly by strict hydrogenotrophic methanogens and facultative aceticlastic methanogens. Continuous stirring was harmful to the stabilization of mesophilic system, but not to the thermophilic one.
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