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A 10 L upflow microbial fuel cell (UMFC) was used for simultaneous carbon and nitrogen removal, generating electricity and achieving high removal efficiencies. The UMFC operated effectively with synthetic wastewater and chicken manure wastewater as substrates. The results have implications for the development of pilot-scale microbial fuel cells.

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Literature priors

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Distribution

Reported parameters

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Coulombic efficiency94.1%

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What they did

System
MFC

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Abstract

A 10 L upflow microbial fuel cell (UMFC) was constructed for simultaneous carbon and nitrogen removal. During the 6-month operation, the UMFC constantly removed carbon and nitrogen, and then generated electricity with synthetic wastewater as substrate. At 5.0 mg L⁻¹ dissolved oxygen, 100 Ω external resistance, and pH 6.5, the maximum power density (Pmax) and nitrification rate for the UMFC was 19.5 mW m⁻² and 17.9 mg·(L d)−1, respectively. In addition, Pmax in the UMFC with chicken manure wastewater as substrate was 16 mW m⁻², and a high chemical oxygen demand (COD) removal efficiency of 94.1% in the UMFC was achieved at 50 mM phosphate-buffered saline. Almost all ammonia in the cathode effluent was effectively degraded after biological denitrification in the UMFC cathode. The results can help to further develop pilot-scale microbial fuel cells for simultaneous carbon and nitrogen removal.

Key findings

  • Maximum power density of 19.5 mW m⁻² at 5.0 mg L⁻¹ dissolved oxygen, 100 Ω external resistance, and pH 6.5
  • Nitrification rate of 17.9 mg·(L d)−1
  • High chemical oxygen demand (COD) removal efficiency of 94.1% at 50 mM phosphate-buffered saline

Keywords

Microbial fuel cellChemical oxygen demandEffluentWastewaterDenitrificationCarbon fibers

Identifiers

DOI
10.2166/wst.2013.705
Journal
Water Science and Technology
Year
2013