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Bioresource Technology
Vol.,
157, No. 1, 2014; Pages: 284–292

Characterization of microbial current production as a function of microbe–electrode-interaction

Kerstin Dolch, Joana Danzer, Tobias Kabbeck, Benedikt Bierer, Johannes Erben, Andreas H. Förster, Jan Maisch, Peter Nick, Sven Kerzenmacher, Johannes Gescher

Institute for Applied Biosciences, Department of Applied Biology, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany.

Abstract

Microbe–electrode-interactions are keys for microbial fuel cell technology. Nevertheless, standard measurement routines to analyze the interplay of microbial physiology and material characteristics have not been introduced yet. In this study, graphite anodes with varying surface properties were evaluated using pure cultures of Shewanella oneidensis and Geobacter sulfurreducens, as well as defined and undefined mixed cultures. The evaluation routine consisted of a galvanostatic period, a current sweep and an evaluation of population density. The results show that surface area correlates only to a certain extent with population density and anode performance. Furthermore, the study highlights a strain-specific microbe–electrode-interaction, which is affected by the introduction of another microorganism. Moreover, evidence is provided for the possibility of translating results from pure culture to undefined mixed species experiments. This is the first study on microbe–electrode-interaction that systematically integrates and compares electrochemical and biological data.

Keywords:Microbial fuel cell; Shewanella oneidensisGeobacter sulfurreducens; Electrode material; qPCR.


 
 
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