Oxidation of glucose by syntrophic association between Geobacter and hydrogenotrophic methanogens in microbial fuel cell
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To investigate a syntrophic interaction between Geobacter sulfurreducens and hydrogenotrophic methanogens in sludge-inoculated microbial fuel cell (MFC) systems running on glucose with an improved electron recovery at the anode.
The presence of archaea in MFC reduces Coulombic efficiency (CE) due to their electron scavenging capability but, here, we demonstrate that a syntrophic interaction can occur between G. sulfurreducens and hydrogenotrophic methanogens via interspecies H2 transfer with improvement in CE and power density. The addition of the methanogenesis inhibitor, 2-bromoethanesulfonate (BES), resulted in the reduction in power density from 5.29 to 2 W/m3, and then gradually increased to the peak value of 5.5 W/m3 when BES addition was stopped.
Reduction of H2 partial pressure by archaea is an efficient approach in improving power output in a glucose-fed MFC system using Geobacter sp. as an inoculum.
KeywordsElectron balance Geobacter sulfurreducens Hydrogenotrophic methanogen Interspecies H2 transfer Microbial fuel cell
We thank the Nigerian Tertiary Education Trust (TET) fund for funding this research via TETF 2012 AST & D. We, also, acknowledge the Water Quality Control Laboratory, a division of Environmental Engineering, Hokkaido University Japan for facilitating the major part of this research.
Compliance with ethical standards
Conflict of interest
The authors declare no financial or commercial conflict of interest.
- Ishi S, Logan BE, Sekiguchi Y (2012) Enhanced electrode-reducing rate during the enrichment process in an air-cathode microbial fuel cell. Appl Microbiol Cell Physiol 94:1087–1094Google Scholar
- Rittman BE, McCarty PI (2001) Environmental biotechnology: principles and applications. McGraw-Hill, USA, p 145Google Scholar