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A microbial fuel cell (MFC) coupled with an aeration chamber and bio-cathode was investigated for simultaneous carbon and nitrogen removal from synthetic domestic wastewater, achieving power density of 1.3 W/m³ and nitrate removal rate of 67 g NO3-N/m³ d.

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What they did

System
MFC

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Abstract

For simultaneous carbon and nitrogen removal via single stream, a microbial fuel cell (MFC) coupled with an aeration chamber and a bio-cathode was investigated. Without catalysts and any additional buffer, the MFC produced electricity continuously and the power density reached 1.3 W/m³ at a loading rate of 1.6 kg COD/m³ d. Simultaneously, the COD and the nitrate removal rate were 1.4 kg COD/m³ d and 67 g NO3-N/m³ d, respectively. When the hydraulic retention time was changed from 6 to 0.75 hours, the power density significantly increased from 0.2 to 10.8 W/m³ due to an increase of cathodic potential. When the aeration chamber was removed and the nitrate was injected into the cathode, the power density increased to 3.7 W/m³. At a high recirculation rate of 10 ml/min, the power density and the nitrate removal rate greatly increased to 34 W/m³ and 294 g NO3−-N/m3 d, respectively.

Key findings

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Keywords

Microbial fuel cellAerationWastewaterOrganic matterWaste managementNitrogen

Identifiers

DOI
10.2166/wst.2009.489
Journal
Water Science and Technology
Year
2009