期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 18, 页码 8700-8706出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.02.012
关键词
Anaerobic digestion; Hydrogen; Methane; Two-stage process
资金
- Danish Agency for Science, Technology and Innovation [2104-06-0004]
- Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), China [YRWEY1003]
- Bayer Sustainable Development Foundation
- China Scholarship Council
- Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation
The present study investigated a two-stage anaerobic hydrogen and methane process for increasing bioenergy production from organic wastes. A two-stage process with hydraulic retention time (HRT) 3 d for hydrogen reactor and 12 d for methane reactor, obtained 11% higher energy compared to a single-stage methanogenic process (HRT 15 d) under organic loading rate (OLR) 3 gVS/(L d). The two-stage process was still stable when the OLR was increased to 4.5 gVS/(L d), while the single-stage process failed. The study further revealed that by changing the HRThydrogen:HRTmethane ratio of the two-stage process from 3:12 to 1:14,6.7%, more energy could be obtained. Microbial community analysis indicated that the dominant bacterial species were different in the hydrogen reactors (Thermoanaerobacterium thermosaccharolyticum-like species) and methane reactors (Clostridium thermocellum-like species). The changes of substrates and HRT did not change the dominant species. The archaeal community structures in methane reactors were similar both in single- and two- stage reactors, with acetoclastic methanogens Methanosarcina acetivorans-like organisms as the dominant species. (C) 2011 Elsevier Ltd. All rights reserved.
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