Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 9, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.180457
Keywords
single-chamber microbial fuel cells; stillage; food waste; microbial community structure
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Funding
- National Scientific Fund of China [51378003]
- International Science & Technology Cooperation Program of China [2013DFG92600]
- Fundamental Research Funds for the Central Universities
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A single-chamber microbial fuel cell (MFC) was used in this study to treat recycled stillage obtained from food waste ethanol fermentation. Corresponding substrates inside the system were evaluated by fluorescence spectra, and microbial communities were also investigated. Results demonstrated that output voltage and current, respectively, reached 0.29 V and 1.4 mA with an external resistance of 200 Omega. Corresponding, total organic carbon and chemical oxygen demand removal efficiency reached more than 50% and 70%, respectively. Results of fluorescence spectra demonstrated that tryptophan-like aromatic, soluble microbial by-product-like and humic acid-like substances accumulated and were not easily degraded. Microbial community analysis by high-throughput sequence indicated that Advenella and Moheibarter occupied the highest proportion among all genera at the anode instead of Geobacter. These results may be due to complicated accumulated stillage, and potential tetracyclines possibly influenced microbial communities. Details on how stillage affects MFC operation should be further studied, and a solution on relieving effects should be established.
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