Szukana fraza: [Abstract = "In this paper the analysis of MFC operation \(cell voltage, power, and current density\) fed by mixed municipal and industrial wastewaters was shown. Moreover, the change in time of COD was analyzed. Due to cost reduction the membrane\-less microbial fuel cell \(ML\-MFC\) was chosen. It was noted that the addition of concentrated process wastewater increases the COD reduction time in the ML\-MFC."]