Electricity generation from sweet potato-shochu waste using microbial fuel cells

Electricity generation and treatment of sweet potato-shochu waste, acidic and organic-rich slurry, was examined using cassette-electrode microbial fuel cells (CE-MFCs). Among CE-MFCs with raw (73 g-chemical oxygen demand chromium CODCr/L) and different concentration of diluted sweet potato-shochu wa...

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Bibliographic Details
Published in:Journal of bioscience and bioengineering 2019-07, Vol.128 (1), p.56-63
Main Authors: Iigatani, Reo, Ito, Toshihiro, Watanabe, Fumiko, Nagamine, Miyuki, Suzuki, Yoshihiro, Inoue, Kengo
Format: Article
Language:English
Subjects:
Acidic waste
Bacteroides
Clostridium
Microbial fuel cells
Renewable energy
Shochu waste
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Summary:Electricity generation and treatment of sweet potato-shochu waste, acidic and organic-rich slurry, was examined using cassette-electrode microbial fuel cells (CE-MFCs). Among CE-MFCs with raw (73 g-chemical oxygen demand chromium CODCr/L) and different concentration of diluted sweet potato-shochu waste (0.5, 1, 5, 10, and 20 g-CODCr/L) without pH control, the maximum power density (1.2 W/m3) and CODCr removal efficiency (67.4 ± 1.8%) were observed in the CE-MFCs with 10 g-CODCr/L shochu waste. The concentration of organic acid was decreased to below the quantification limits during the 9-day operation in the CE-MFC with 10 g-CODCr/L shochu waste. During the same period, the electrolyte pH was increased from 4.2 to 6.6. Microbial community analysis revealed that the genus Clostridium (75.4%) was predominant in the CE-MFCs with raw shochu waste, whereas Bacteroides (65.3%) and Clostridium (12.1%) were predominant in the CE-MFCs with 10 g-CODCr/L shochu waste.
ISSN:1389-1723
1347-4421
DOI:10.1016/j.jbiosc.2018.12.015