Anaerobic submerged membrane bioreactor (AnSMBR) for municipal wastewater treatment under mesophilic and psychrophilic temperature conditions

► An anaerobic MBR treating sewage was operated under two temperature conditions. ► Besides gas sparging, sludge circulation was used to control fouling. ► A stable filtration resistance was achieved in long-term under mesophilic conditions. ► The filtration resistance increased faster under psychrophilic conditions. ► COD removal efficiency was close to 90% under both temperature conditions.