Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7082395 | Bioresource Technology | 2013 | 9 Pages |
Abstract
Through their ability to directly transfer electrons to electrodes, Geobacter sp. are key organisms for microbial fuel cell technology. This study presents a simple method to reproducibly select Geobacter-dominated anode biofilms from a mixed inoculum of bacteria using graphite electrodes initially poised at â0.25, â0.36 and â0.42Â V vs. Ag/AgCl. The biofilms all produced maximum power density of approximately 270Â mWÂ mâ2 (projected anode surface area). Analysis of 16S rRNA genes and intergenic spacer (ITS) sequences found that the biofilm communities were all dominated by bacteria closely related to Geobacter psychrophilus. Anodes initially poised at â0.25Â V reproducibly selected biofilms that were dominated by a strain of G. psychrophilus that was genetically distinct from the strain that dominated the â0.36 and â0.42Â V biofilms. This work demonstrates for the first time that closely related strains of Geobacter can have very different competitive advantages at different anode potentials.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Audrey S. Commault, Gavin Lear, Michael A. Packer, Richard J. Weld,