Journal
BIORESOURCE TECHNOLOGY
Volume 244, Issue -, Pages 982-988Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.08.065
Keywords
Carbon sources; Methanogenesis; Electron transfer; Metagenome
Funding
- Shenzhen Science and Technology Development Funding for International Cooperation [GJHZ20160226191632089]
- National Key Research and Development Program of China for International Science and Innovation Cooperation Major Project between Governments [2016YFE0118800]
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In this study, the effects of four types of organic compounds (tryptone, acetate/ propionate, glucose and ethanol) on methanogenesis, electron transfer processes and microbial community structure were examined. When tryptone and acetate/ propionate were used, the dominant methanogenic pathway was aceticlastic methanogenesis and Methanosarcina was the most abundant methanogen. When glucose or ethanol were provided as the external carbon source, the aceticlastic and hydrogenotrophic pathways were utilised simultaneously, and Methanosarcina and Methanobacterium were enriched. However, the reactor fed with glucose was prone to acidification because volatile fatty acids accumulated in the medium, which inhibited methane synthesis. Geobacter was dominant in the reactor fed with ethanol and 45% of genes encoding pili synthesis were attributable to Geobacter, indicating that direct interspecies electron transfer may be a possible mechanism during syntrophic methanogenesis.
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