DOI: 10.3724/SP.J.1145.2013.00827

Chinese Journal of Appplied Environmental Biology (应用与环境生物学报) 2013/19:5 PP.827-832

Coupled Bioelectrochemical System for Reducing CO2 to Simple Organic Compounds in the Presence of H2

Reduction of CO2 to organics with bioelectrochemical system has been a research hotspot of environmental biology. In this study, a coupled bioelectrochemical system was constructed for reducing CO2 in the presence of H2. With the biocathode potential at -0.75 V (vs. Ag/AgCl), the system was evaluated about its capacity in producing acetate and ethanol from CO2, and the composition of the active microbial population was assessed. After 12 days, the maximum production of acetate and ethanol was enhanced to 2 810 (±80) mg/L and 110 (±5) mg/L, respectively. The accumulations of acetate and ethanol were 2.2 and 1.5 times respectively those of the control without setting cathode potential. CV tests suggested that microorganisms on the biocathodes showed higher electrochemical activity than the control without setting cathode potential. SEM showed the cathodes were densely covered with rod-shaped microorganisms. PCR-DGGE revealed the biocathode was dominated by Acetobacterium. This study adds to the knowledge of bioelectrochemical system for CO2 reduction to organic compounds, and provides a method for active microorganisms enrichment.

Key words:bioelectrochemical system,H2,CO2,biosynthesis,simple organic compound

ReleaseDate:2014-07-21 16:56:34

Funds:National Natural Science Foundation of China (Nos. 31270166, 51074149)