Power generation during the operation of MFC with the function of time (control, biofilm surface coverage, 0%; PDF, partially developed biofilm covered over ∼44% of anode surface; FDB, fully developed biofilm covered over ∼96% of anode surface; CW, chemical wastewater; DSW, design synthetic wastewater; operating of MFC, pH 6 at 28°C) [r2, 0.9918].66