Treating Simulated Nitrate Pollution Groundwaterwith Different pH by Microbial Fuel Cell
Shaohua Chen, Wenliang Chen, Xiufang Wang, Yi Ding +2
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82% confidenceThis study constructed a dual-chamber microbial fuel cell (MFC) operating in porous medium to simulate groundwater conditions and treat nitrate pollution. The system used a sand-filled cathode chamber connected via salt bridge to an anode chamber containing contaminated water. Performance was evaluated across three pH values (5.5, 7.0, 8.5) for COD removal, nitrate degradation, and electricity generation. Results showed pH 7.0 was optimal for both contaminant removal and power generation, though absolute power output remained low.
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Abstract
Microbial fuel cell (MFC) is regarded as a promising technology to treat waste water and generate electricity simultaneously. MFCs usually work in the water-soluble medium, but the performance of the MFC which works in the porous medium is still unclear. Therefore, in this paper, a sand box was used to construct a dual-chamber MFC to investigate its performance. The MFC was used in porous medium to simulate the environment of groundwater, which was used to investigate the nitrate removal rate and the performance of electricity generation under different pH values. The performance of the MFC electrode was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that the maximum power density was 0.003 mW/m 3 (pH = 7.0) and the lowest nitrate concentration was 0.49 mg/L (pH = 8.5). The dominant microbial communities were Comamonadaceae bacterium, Xanthomonas axonopodis et al. Although the MFC was weak in electricity generation, it could offer valuable reference to further experiment.
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- Journal
- Polish Journal of Environmental Studies
- Year
- 2020