Journal
AMB EXPRESS
Volume 3, Issue -, Pages -Publisher
BIOMED CENTRAL LTD
DOI: 10.1186/2191-0855-3-17
Keywords
Bioelectrochemical reactor; Supporting material; Carbon fiber textile; Thermophilic methanogenesis; High organic loading rate
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Funding
- New Energy and Industrial Technology Development Organization (NEDO), Japan
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A cylindrical bioelectrochemical reactor (BER) containing carbon fiber textiles (CFT; BER + CFT) has characteristics of bioelectrochemical and packed-bed systems. In this study, utility of a cylindrical BER + CFT for degradation of a garbage slurry and recovery of biogas was investigated by applying 10% dog food slurry. The working electrode potential was electrochemically regulated at -0.8 V (vs. Ag/AgCl). Stable methane production of 9.37 L-CH4 . L-1 . day(-1)d and dichromate chemical oxygen demand (CODcr) removal of 62.5% were observed, even at a high organic loading rate (OLR) of 89.3 g-CODcr.L-1 . day(-1). Given energy as methane (372.6 kJ . L-1 . day(-1)) was much higher than input electric energy to the working electrode (0.6 kJ . L-1 . day(-1)) at this OLR. Methanogens were highly retained in CFT by direct attachment to the cathodic working electrodes (52.3%; ratio of methanogens to prokaryotes), compared with the suspended fraction (31.2%), probably contributing to the acceleration of organic material degradation and removal of organic acids. These results provide insight into the application of cylindrical BER + CFT in efficient methane production from garbage waste including a high percentage of solid fraction.
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