Long‐term effects of the transient COD concentration on the performance of microbial fuel cells
S. Mateo, A. Gonzalez del Campo, J. Lobato, M. Rodrigo +2
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70% confidenceThe study examines the long-term effects of transient COD concentrations on microbial fuel cell performance, showing enhancements in COD consumption rate and current, and varying Coulombic efficiencies.
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Abstract
In this work, the long‐term effects of transient chemical oxygen demands (COD) concentrations over the performance of a microbial fuel cell were studied. From the obtained results, it was observed that the repetitive change in the COD loading rate during 12 h conditioned the behavior of the system during periods of up to 7 days. The main modifications were the enhancement of the COD consumption rate and the exerted current. These enhancements yielded increasing Coulombic efficiencies (CEs) when working with COD concentrations of 300 mg/L, but constant CEs when working with COD concentrations from 900 to 1800 mg/L. This effect could be explained by the higher affinity for the substrate of Geobacter than that of the nonelectrogenic organisms such as Clostridia . © 2016 American Institute of Chemical Engineers Biotechnol. Prog. , 32:883–890, 2016
Key findings
- Repetitive changes in COD loading rate condition the system's behavior for up to 7 days.
- COD concentrations of 300 mg/L yield increasing Coulombic efficiencies, while concentrations from 900 to 1800 mg/L yield constant efficiencies.
- The higher affinity for the substrate of Geobacter compared to nonelectrogenic organisms like Clostridia explains the observed effects.
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Identifiers
- Journal
- Biotechnology Progress
- Year
- 2016