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70% confidence

A constructed wetland connected to an air-cathode microbial fuel cell (ACMFC) generated significantly more bioelectricity and treated wastewater more efficiently than a constructed wetland connected to a traditional microbial fuel cell (MFC).

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What they did

System
MFC

What worked

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Abstract

Abstract The aim of this study was to investigate the different performance of bioelectricity generation and wastewater treatment between constructed wetland (CW) respectively coupled with air-cathode microbial fuel cell (ACMFC) and microbial fuel cell (MFC) under a fed-batch mode. During a 75-day-operation, the voltage of CW-ACMFC and CW-MFC ranged from 0.36 to 0.52 V and from −0.04 to 0.07 V, indicating that the bioenergy output of CW-ACMFC was significantly higher than that of CW-MFC system. In addition, the maximum of power density of CW-ACMFC and CW-MFC was 4.21 and 0.005 mW m⁻². Notably, the chemical oxygen demand (COD) and NH3-N removal efficiency of CW-ACMFC was slightly higher than that in CW-MFC, which resulted from a higher voltage accelerating the transport of electron donors and the growth of microorganisms and plants. This study possesses a probability of using ACMFC coupled with CW to enhance the pollutant removal performance in CW system.

Key findings

  • The voltage of the CW-ACMFC system was 0.36-0.52 V, while the voltage of the CW-MFC system was -0.04 to 0.07 V.
  • The maximum power density of the CW-ACMFC system was 4.21 mW m⁻², while the maximum power density of the CW-MFC system was 0.005 mW m⁻².
  • The CW-ACMFC system had a slightly higher COD and NH3-N removal efficiency than the CW-MFC system.

Keywords

Microbial fuel cellConstructed wetlandCathodeBioenergyChemical oxygen demandWastewater

Identifiers

DOI
10.2166/wst.2018.471
Journal
Water Science and Technology
Year
2018