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A constructed wetland reactor integrated with a microbial fuel cell reactor (CW-MFC) showed improved performance in treating oil-contaminated wastewater and generating electricity compared to a microbial fuel cell reactor (MFC) alone and a constructed wetland reactor (CW) alone.

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What they did

System
MFC
Substrate
real wastewater

What worked

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Abstract

Conventional oil sewage treatment methods can achieve satisfactory removal efficiency, but energy consumption problems during the process of oil sewage treatment are worth attention. The integration of a constructed wetland reactor and a microbial fuel cell reactor (CW-MFC) to treat oil-contaminated wastewater, compared with a microbial fuel cell reactor (MFC) alone and a constructed wetland reactor (CW) alone, was explored in this research. Performances of the three reactors including chemical oxygen demand (COD), oil removal, and output voltage generation were continuously monitored. The COD removals of three reactors were between 73% and 75%, and oil removals were over 95.7%. Compared with MFC, the CW-MFC with a MnO2 modified cathode produced higher power density and output voltage. Maximum power densities of CW-MFC and MFC were 3868 mW/m3 (102 mW/m2) and 3044 mW/m3 (80 mW/m2), respectively. The plants in CW-MFC play a positive role for reactor cathode potential. Both plants and cathode modification can improve reactor performance of electricity generation.

Key findings

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Keywords

Microbial fuel cellChemical oxygen demandConstructed wetlandWastewaterSewage treatmentElectricity generation

Identifiers

DOI
10.3390/ma9110885
Journal
Materials
Year
2016