As such, the swine wastewater was diluted with tap water before being fed to the CW-MFCs. Influent COD concentrations varied from 411 to 854 mg/L with average total nitrogen (TN), ammonium (NH4-N), total phosphorous (TP) and reactive phosphorous (RP) concentrations of 63 ± 7.5 mg/L, 40 ± 5.3 mg/L, 8.9 ± 2.1 mg/L and 6.2 ± 1.5 mg/L, respectively.