Journal
BIORESOURCE TECHNOLOGY
Volume 195, Issue -, Pages 265-272Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.141
Keywords
Microbial fuel cell; Electroactive biofilm; Soils; Electrode surface; Population profiling
Funding
- New Zealand Ministry of Business, Innovation and Employment (MBIE) [LVLX0802]
- Lincoln Agritech Ltd PhD scholarship
- France-New Zealand Dumont d'Urville exchange program
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [LVLX0802] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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This study evaluated the impact of inoculum source and anode surface modification (carboxylate -COO and sulfonamide -SO2NH2 groups) on the microbial composition of anode-respiring biofilms. These two factors have not previously been considered in detail. Three different inoculum sources were investigated, a dry aerobic soil, brackish estuarine mud and freshwater sediment. The biofilms were selected using a poised anode (-0.36 V vs Ag/AgCl) and acetate as the electron donor in a three-electrode configuration microbial fuel cell (MFC). Population profiling and cloning showed that all biofilms selected were dominated by Geobacter sp., although their electrochemical properties varied depending on the source inoculum and electrode surface modification. These findings suggest that Geobacter sp. are widespread in soils, even those that do not provide a continuously anaerobic environment, and are better at growing in the MFC conditions than other bacteria. (C) 2015 Elsevier Ltd. All rights reserved.
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