期刊
WATER RESEARCH
卷 46, 期 17, 页码 5756-5764出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2012.07.061
关键词
Archaeal community structure; Degassing membrane; Dissolved methane; Municipal wastewater; Psychrophilic condition; Upflow anaerobic sludge blanket process
资金
- Core Research of Evolutional Science & Technology (CREST) for Innovative Technology and System for Sustainable Water Use from the Japan Science and Technology Agency (JST)
- Hokkaido Gas Co., Ltd.
- Grants-in-Aid for Scientific Research [22510085] Funding Source: KAKEN
Anaerobic treatment is an attractive option for the biological treatment of municipal wastewater. In this study, municipal wastewater was anaerobically treated with a bench-scale upflow anaerobic sludge blanket (UASB) reactor at temperatures from 6 to 31 degrees C for 18 months to investigate total chemical oxygen demand (COD) removal efficiency, archaeal community structure, and dissolved methane (D-CH4) recovery efficiency. The COD removal efficiency was more than 50% in summer and below 40% in winter with no evolution of biogas. Analysis of the archaeal community structures of the granular sludge from the UASB using 16S rRNA gene-cloning indicated that after microorganisms had adapted to low temperatures, the archaeal community had a lower diversity and the relative abundance of acetoclastic methanogens decreased together with an increase in hydrogenotrophic methanogens. D-CH4, which was detected in the UASB effluent throughout the operation, could be collected with a degassing membrane. The ratio of the collection to recovery rates was 60% in summer and 100% in winter. For anaerobic treatment of municipal wastewater at lower temperatures, hydrogenotrophic methanogens play an important role in COD removal and D-CH4 can be collected to reduce greenhouse gas emissions and avoid wastage of energy resources. (C) 2012 Elsevier Ltd. All rights reserved.
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