[Study on performance characteristics of carbon membrane-aerated biofilm reactor treating municipal wastewater].
A carbon membrane-aerated biofilm reactor was developed to treat municipal wastewater. Tests were conducted to investigate oxygen transfer ability of carbon membrane, the bacteria adhesion and reactor's set-up performance. The optimum parameters were determined in terms of intra-membrane pressure, COD and nitrogen ratio and hydraulic retention time (HRT). The results showed that compared with that of other hollow fibres, bacterial suspended exhibited a high degree of adhesion onto carbon membrane and that oxygen transfer coefficient of carbon membrane was 0.36 m/h, so that it was feasible to serve as both biofilm carrier and aerator. NH4(+) -N removal, denitrification and COD removal efficiency could reach 95%, 92% and 88%, respectively, under the conditions of intra-membrane pressure of 0.025 MPa, carbon nitrogen ratio of 5 and HRT of 8 h, and effluent quality could be up to A standard in the national discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002) . Furthermore, the system displayed better resistance to shock loads.
Liu
Hui-Jun
HJ
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China. lhj1130@sina.com
Yang
Feng-Lin
FL
Hu
Shao-Wei
SW
Liu
Qiang
Q
D001419:Bacteria / Q000254:growth & development / Q000378:metabolism; D001673:Biodegradation, Environmental; D018441:Biofilms; D019149:Bioreactors; D002244:Carbon; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D014873:Water Pollutants / Q000302:isolation & purification* / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D014873:Water Pollutants; D002244:Carbon; D009584:Nitrogen; D010100:Oxygen