Abstract
A submerged type microbial fuel cell (MFC) system, which consisted of six readily exchangeable air–cathode MFCs, was evaluated for continuous treatment of low-strength domestic wastewater. When supplied with synthetic wastewater (COD 100mg/L), the system showed increasing maximum power densities from 191 to 754mW/m2 as COD loading rates increased (0.20–0.40kg/m3/day). COD removal efficiencies decreased with increased COD loading rates but the effluent COD concentrations met the relevant effluent quality standard (CODMn 20mg/L) at all conditions. The system was then operated with domestic wastewater (c.a. 100mg COD/L) at 0.32 and 0.43kg/m3/day. The system showed much lower power densities (116–149mW/m2) at both loading rates, compared to synthetic wastewater. Anodic microbial communities were completely different when the wastewater type was changed. These results suggest that the newly developed MFC system could be applied to treat low-strength domestic wastewater without requiring any additional organic removal stage.
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