Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 24, Pages 11172-11176Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.09.078
Keywords
MFC; MEC; BES; Coulombic efficiency; Current density
Funding
- Dutch Ministry of Economic Affairs
- European Union
- Province of Fryslan
- city of Leeuwarden
- Samenwerkingsverband Noord-Nederland
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To create an efficient bioelectrochemical system, a high Coulombic efficiency is required. This efficiency is a direct measure for the competition between electrogens and methanogens when acetate is used as substrate. In this study the Coulombic efficiency in a microbial electrolysis cell was investigated. As a result of an increase in substrate concentration from 1 to 35 mM, the current density increased to 21.1 A/m(2), while the Coulombic efficiency decreased to 52%. As a result of an increase in anode potential from -450 to -0.250 mV, the current density increased to 20.9 A/m(2), while the Coulombic efficiency increased 21%. Knowledge about the substrate affinity and growth kinetics is crucial to control the Coulombic efficiency. Further research is required to optimize strategies to find a balance between the Coulombic efficiency, current density and removal rate of organic material. (C) 2011 Elsevier Ltd. All rights reserved.
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