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Generic MFCRepresentative model
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Representative MFC — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MFC

What worked

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Abstract

Conventional aerobic treatment of swine wastewater, which generally contains 4500–8200 mg L⁻¹ of organic matter, is energy-consuming. The aim of this study was to assess the application of scaled-up microbial fuel cells (MFCs) with different capacities (i.e., 1.5 L, 12 L, and 100 L) for removing organic matter from swine wastewater. The MFCs were single-chambered, consisting of an anode of microbially reduced graphene oxide (rGO) and an air-cathode of platinum-coated carbon cloth. The MFCs were polarized via an external resistance of 3–10 Ω for 40 days for the 1.5 L-MFC and 120 days for the 12L- and 100 L-MFC. The MFCs were operated in continuous flow mode (hydraulic retention time: 3–5 days). The 100 L-MFC achieved an average chemical oxygen demand (COD) removal efficiency of 52%, which corresponded to a COD removal rate of 530 mg L⁻¹ d⁻¹. Moreover, the 100 L-MFC showed an average and maximum electricity generation of 0.6 and 2.2 Wh m⁻³, respectively. Our findings suggest that MFCs can effectively be used for swine wastewater treatment coupled with the simultaneous generation of electricity.

Keywords

Microbial fuel cellWastewaterChemical oxygen demandOrganic matterAnodePulp and paper industry

Identifiers

DOI
10.3390/w11091803
Journal
Water
Year
2019