Treatment of Domestic Sewage by Membrane Bioreactor with Bubbleless Aeration

摘要

An experiment was carried out to use plate-type silicone rubber membrane equipped bioreactor with bubbleless oxygen supplying for the treatment of domestic sewage. The effects of hydraulic load, COD_(cr) entrance concentration and oxygen pressure on the discharge concentrations of COD_(cr), BOD_5 and NH_3-N were investigated. The results showed that the discharge concentrations of the three pollutants were 18.6 mg- L~(-1), 9.33 mg- L~(-1) and 3.56 mg-L~(-1) respectively when hydraulic load was 0. 25 m~3.m~(-2).h~(-1) and entrance concentrations of COD_(cr) , BOD_5 and NH_3-N were 220 mg-L~(-1), 140 mg-L~(-1) and 45 mg-L~(-1), respectively. These values are lower than the standard ones regulated in the 《Emission Standards of Municipal Wastewater Treatment Plant 》 （GB/18918-2002) issued by Chinese government . The degrading dynamic models of COD_(cr) and BOD5 were established and proved to be basically consistent with the experiment values.