AI Article Synopsis
- A microbial fuel cell (MFC) used graphite electrodes and an anaerobic consortium to effectively degrade phenol, achieving a current density of 120 mA/m and a coulombic efficiency of 22.7%.
- The MFC's performance remained stable even after removing planktonic bacteria, indicating that the anode biofilm microorganisms, rather than planktonic ones, were responsible for phenol degradation and current generation.
- Analysis revealed that Geobacter sp. was the key phenol degrader within the anode biofilm, confirmed through 16S rRNA gene sequencing and cyclic voltammetry testing.
Article Abstract
A microbial fuel cell (MFC), with graphite electrodes as both the anode and cathode, was operated with a soil-free anaerobic consortium for phenol degradation. This phenol-degrading MFC showed high efficiency with a current density of 120 mA/m and a coulombic efficiency of 22.7%, despite the lack of a platinum catalyst cathode and inoculation of sediment/soil. Removal of planktonic bacteria by renewing the anaerobic medium did not decrease the performance, suggesting that the phenol-degrading MFC was not maintained by the planktonic bacteria but by the microorganisms in the anode biofilm. Cyclic voltammetry analysis of the anode biofilm showed distinct oxidation and reduction peaks. Analysis of the microbial community structure of the anode biofilm and the planktonic bacteria based on 16S rRNA gene sequences suggested that Geobacter sp. was the phenol degrader in the anode biofilm and was responsible for current generation.
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| http://dx.doi.org/10.1016/j.jbiosc.2016.10.010 | DOI Listing |
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