Convergent development of anodic bacterial communities in microbial fuel cells

ISME Journal - Tập 6 Số 11 - Trang 2002-2013 - 2012
Matthew D. Yates1, Patrick Kiely1, Douglas F. Call1, Hamid Rismani‐Yazdi2, Kyle Bibby2, Jordan Peccia2, John M. Regan1, Bruce E. Logan1
1Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA, USA
2Department of Chemical and Environmental Engineering, Yale University , New Haven, CT , USA

Tóm tắt

Abstract Microbial fuel cells (MFCs) are often inoculated from a single wastewater source. The extent that the inoculum affects community development or power production is unknown. The stable anodic microbial communities in MFCs were examined using three inocula: a wastewater treatment plant sample known to produce consistent power densities, a second wastewater treatment plant sample, and an anaerobic bog sediment. The bog-inoculated MFCs initially produced higher power densities than the wastewater-inoculated MFCs, but after 20 cycles all MFCs on average converged to similar voltages (470±20 mV) and maximum power densities (590±170 mW m−2). The power output from replicate bog-inoculated MFCs was not significantly different, but one wastewater-inoculated MFC (UAJA3 (UAJA, University Area Joint Authority Wastewater Treatment Plant)) produced substantially less power. Denaturing gradient gel electrophoresis profiling showed a stable exoelectrogenic biofilm community in all samples after 11 cycles. After 16 cycles the predominance of Geobacter spp. in anode communities was identified using 16S rRNA gene clone libraries (58±10%), fluorescent in-situ hybridization (FISH) (63±6%) and pyrosequencing (81±4%). While the clone library analysis for the underperforming UAJA3 had a significantly lower percentage of Geobacter spp. sequences (36%), suggesting that a predominance of this microbe was needed for convergent power densities, the lower percentage of this species was not verified by FISH or pyrosequencing analyses. These results show that the predominance of Geobacter spp. in acetate-fed systems was consistent with good MFC performance and independent of the inoculum source.

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ISME Journal

Tập 6 Số 11

2002-2013

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