Journal
BIOSENSORS & BIOELECTRONICS
Volume 24, Issue 4, Pages 1006-1011Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2008.08.001
Keywords
Microbial fuel cell; Microbial biosensors; Electroactive bacteria; Mixed culture biofilm; Geobacter sulfurreducens
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Funding
- Alexander von Humboldt foundation
- Deutschen Bundesstiftung Umwelt (DBU)
- Studienstiftung des deutschen Volkes
- Deutsche Forschungsgerneinschaft
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In this paper we demonstrate that the anodic, bioelectrocatalytic performance of wastewater inoculum based, mixed culture microbial biofilms can be considerably improved by using a consecutive, purely electrochemical selection and biofilm acclimatization procedure. The procedure may represent an alternative to a repetitive mechanical biofilm removal, re-suspension and electrochemically facilitated biofilm formation. By using the proposed technique, the bioelectrocatalytic current density was increased from the primary to the secondary biofilm from 250 mu A cm(-2) to about 500 mu A cm(-2); and the power density of respective microbial fuel cells could be increased from 686 mW m(-2) to 1487 MW m(-2). The electrochemical characterization of the biofilms reveals a strong similarity to Geobacter sulfurreducens biofilms, which may indicate a dominating role of this bacterium in the biofilms. (C) 2008 Elsevier B.V. All rights reserved.
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