MESSAI.iO

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70% confidence

A dual-chamber MFC was constructed to evaluate bioelectricity generation and pollutant removal from sugar beet processing wastewater. The MFC achieved a power density of 14.9 mW m⁻² and removed >97% of COD and up to 100% of total suspended solids. A diverse microbial community was active for electricity generation and wastewater treatment.

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Literature priors

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Distribution

Reported parameters

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Coulombic efficiency6.21%

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What they did

System
MFC

What worked

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Abstract

Abstract Bioelectricity generation from biodegradable compounds using microbial fuel cells (MFCs) offers an opportunity for simultaneous wastewater treatment. This study evaluated the synergy of electricity generation by the MFC while reducing pollutants from sugar beet processing wastewater (SBPW). A simple dual-chamber MFC was constructed with inexpensive materials without using catalysts. Raw SBPW was diluted to several concentrations (chemical oxygen demand (COD) of 505 to 5,750 mg L⁻¹) and fed as batch-mode into the MFC without further modification. A power density of 14.9 mW m⁻² as power output was observed at a COD concentration of 2,565 mg L⁻¹. Coulombic efficiency varied from 6.21% to 0.73%, indicating diffusion of oxygen through the cation exchange membrane and other methanogenesis and fermentation processes occurring in the anode chamber. In this study, >97% of the COD and up to 100% of the total suspended solids removals were observed from MFC-treated SBPW. Scanning electron microscopy of anode indicated that a diverse community of microbial consortia was active for electricity generation and wastewater treatment. This study demonstrated that SBPW can be used as a substrate in the MFC to generate electricity as well as to treat for pollutant removal.

Key findings

  • A power density of 14.9 mW m⁻² was achieved at a COD concentration of 2,565 mg L⁻¹.
  • Coulombic efficiency varied from 6.21% to 0.73% due to oxygen diffusion and methanogenesis.
  • MFC-treated SBPW showed >97% COD removal and up to 100% total suspended solids removal.

Keywords

Microbial fuel cellChemical oxygen demandWastewaterPulp and paper industryMethanogenesisSewage treatment

Identifiers

DOI
10.2166/wst.2017.549
Journal
Water Science and Technology
Year
2017