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  • Title: Electricity generation coupled to oxidation of propionate in a microbial fuel cell.
    Author: Jang JK, Chang IS, Hwang HY, Choo YF, Lee J, Cho KS, Kim BH, Nealson KH.
    Journal: Biotechnol Lett; 2010 Jan; 32(1):79-85. PubMed ID: 19731045.
    Abstract:
    Propionate was used as fuel to enrich an electrochemically-active microbial consortium in a microbial fuel cell, and the bacterial consortium was analyzed by culture-independent methods including denaturing gradient gel electrophoresis (DGGE) of the 16S rDNA, and by fluorescent in situ hybridization (FISH). MFCs fed with propionate produced a current of 4.88 +/- 0.1 mA stably on 100 mg propionate/l as COD within 3 weeks of the enrichment. When the MFCs were fed with H2-saturated fuel containing propionate, the current dropped to 3.82 +/- 0.07 mA. The maximum current generated was up to 8.8 mA when MFCs were fed with 200 mg propionate/l as COD. The DGGE of 16S rDNA showed that propionate- enriched MFCs have a different bacterial population from that enriched with acetate and from the inoculum used for enrichment. The major member (42%) of the consortium was an unidentified bacterium followed by c, b, and d-proteobacteria.
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