Treatment of Domestic Sewage by Membrane Bioreactor with Bubbleless Aeration

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, CODcr entrance concentration and oxygen pressure on the discharge concentrations of CODcr BOD5 and NH3-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 CODcr BOD5 and NH3-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 CODcr and BOD5 were established and proved to be basically consistent with the experiment values.