期刊
BIORESOURCE TECHNOLOGY
卷 129, 期 -, 页码 366-373出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.11.048
关键词
Bioelectrochemical reactor; Supporting material; Carbon fiber fabric; Methanogenesis; Thickened sewage sludge
资金
- New Energy and Industrial Technology Development Organization (NEDO)
A bioelectrochemical reactor (BER) containing carbon fiber fabric (CFF) (BER + CFF) enabled efficient methane fermentation from thickened sewage sludge. A cylindrical BER + CFF was proposed and scaled-up to a volume of 4.0-L. Thickened sewage sludge was treated using three types of methanogenic reactors. The working electrode potential in the BER + CFF was regulated at -0.8 V (vs. Ag/AgCl). BER + CFF showed gas production of 3.57 L L-1 day(-1) at a hydraulic retention time (HRT) of 4.0 days; however, non-BER + CFF showed a lower gas production rate (0.83 L L-1 day(-1)) at this HRT, suggesting positive effects of electrochemical regulation. A stirred tank reactor (without CFF) deteriorated at an HRT of 10 days, suggesting positive effects of CFF. 16S rRNA gene analysis showed that the BER + CFF included 3 kinds of hydrogenotrophic methanogens and 1 aceticlastic methanogen. These results demonstrate the effectiveness of the BER + CFF for scale-up and flexibility of this technology. (C) 2012 Elsevier Ltd. All rights reserved.
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