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A single-chamber microbial fuel cell (SCMFC) was investigated, achieving a maximum power density of 134.5 mW/m² and a columbic efficiency of 55%.

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Literature priors

Single-chamber air-cathode MFCRepresentative model
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Representative single-chamber air-cathode MFC — matched on the paper’s reported configuration, not its exact geometry.

Distribution

Reported parameters

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Coulombic efficiency9%

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What they did

System
MFC
Substrate
pure compound
Inoculum
mixed bacterial culture of the MSWRFs sample

What worked

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Abstract

This study investigated the bioelectrical performance of a single-chamber microbial fuel cell (SCMFC) fueled with acetate as the electron donor and inoculated with municipal solid waste rejected fractions (MSWRFs) as a microbial inoculum. The molecular characterization of the bacterial community structures of the anodic biofilm was conducted based on 16s RNA gene sequencing. The results indicated that the highest open-circuit voltage (OCV) was 797 mV and the system had a maximum power density of 134.5 mW/m² at a stable current density of 328 mA/m². The microbial fuel cell’s (MFC) columbic efficiency (CE) was 55% at a maximum substrate degradation rate of about 86.6% based on COD removal efficiency. The molecular analysis of the anodic bacterial isolates indicated that the phylogenetic bacterial mixture was dominated by seven strains with similarity percentage above 99% for each strain: Enterococcus faecalis, Clostridium butyricum, Bacillus sp., Bacillus subterranous, Enterobacter celoaca, Klebsiella pneumonia, and Escherichia coli. These results suggested that MSWRFs bacterial consortia have a moderate symbiotic structure as indicated by electrons release in parallel with substrate decomposition.

Key findings

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Keywords

Microbial fuel cellBiofilmEscherichia coliMicrobiologyMicrobial consortiumBacteria

Identifiers

DOI
10.4491/eer.2019.412
Journal
Environmental Engineering Research
Year
2019