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Updated: May 15, 2026

Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
Published on: June 15, 2014
Operation of a cylindrical bioelectrochemical reactor containing carbon fiber fabric for efficient methane
Daisuke Sasaki1, Kengo Sasaki, Atsushi Watanabe
1Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba-ken 270-1194, Japan.
Abstract:
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.
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