Anaerobic treatment of municipal wastewater with a staged anaerobic fluidized membrane bioreactor (SAF-MBR) system.
A laboratory-scale staged anaerobic fluidized membrane bioreactor (SAF-MBR) system was used to treat a municipal wastewater primary-clarifier effluent. It was operated continuously for 192 days at 6-11 L/m(2)/h flux and trans-membrane pressure generally of 0.1 bar or less with no fouling control except the scouring effect of the fluidized granular activated carbon on membrane surfaces. With a total hydraulic retention time of 2.3h at 25°C, the average effluent chemical oxygen demand and biochemical oxygen demand concentrations of 25 and 7 mg/L yielded corresponding removals of 84% and 92%, respectively. Also, near complete removal of suspended solids was obtained. Biosolids production, representing 5% of the COD removed, equaled 0.049 g VSS/g BOD(5) removed, far less than the case with comparable aerobic processes. The electrical energy required for the operation of the SAF-MBR system, 0.047 kW h/m(3), could be more than satisfied by using the methane produced.
Department of Environmental Engineering, Inha University, Namgu, Yonghhyun dong 253, Incheon, Republic of Korea.
Rihye
R
Yoo
Jeonghwan
J
Kim
Perry L
PL
McCarty
Jaeho
J
Bae
D000693:Anaerobiosis; D057219:Biofouling; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002947:Cities; D004560:Electricity; D008567:Membranes, Artificial; D009930:Organic Chemicals / Q000302:isolation & purification; D011312:Pressure; D056910:Republic of Korea; D013816:Thermodynamics; D014835:Volatilization; D062065:Wastewater; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
D008567:Membranes, Artificial; D009930:Organic Chemicals; D062065:Wastewater