investigating the performance of flat sheet membrane bioreactor (fs-mbr) in the biological treatment of municipal wastewater in isfahan south wastewater plant in pilot scale

background: the purpose of this study was to investigate the efficiency of flat sheet membrane bioreactor (fs-mbr) in bod 5 and cod removal of isfahan south municipal wastewater treatment plant. methods: in this study a submerged fs-mbr, with 140 liters volume was fed using microfiltration membrane (mf) during 109 days and hydraulic retention time of 20 hours. findings: the mbr application in mlss concentration of 7800 mg/l achieved an average efficiency removal of 95% and 99 % in cod and bod 5 , respectively. conclusion: it is concluded that fs-mbr could be used in the large scales of municipal wastewater treatment plants due to the removal effluent high quality and the removal of the cod, bod 5 in accordance with effluent discharge standards.