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| Generation of Electricity by the Gram-Positive Desulfitobacterium hafniense Strain DCB2 |
| Topic:
Q21 General Environmental Microbiology |
C. E. Milliken, H. D. May;
Medical Univ of South Carolina, Charleston, SC. |
| Presentation Number: Q-188 |
| Poster Board Number: 511 |
| Keyword:
microbial fuel cell, Desulfitobacterium, Gram-positive |
| Desulfitobacterium hafniense strain DCB2 is a Gram-positive sporeforming bacterium capable of a broad range of catabolism including the use of metals and chlorinated compounds as terminal electron acceptors. Metal reduction is a common feature of Gram-negative bacteria (e.g. Geobacter spp.) that can directly reduce an electrode within a microbial fuel cell and generate electricity. Strain DCB2 was tested for direct electrode reduction in a two-chamber fuel cell equipped with graphite electrodes. Electricity generation was dependent upon growth of the bacterium on the surface of the anode and was sustained after repeated exchange of the medium in the anode chamber without the addition of an exogenous electron carrier. Yeast extract, ethanol or formate served as a fuel source with power densities exceeding 20 mW per m2 of the anode surface. Recovery of electrons was 95% with formate used as fuel. This is the first description of sustained electricity generation with high power density and high electron recovery by a Gram-positive bacterium. |
| Commercial Relationship: |
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| SponsorSSponsorCount: 0 |
| ASMMemberAuthor: Harold D. May |
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