A Study of the Membrane Bioreactor for Treating Municipal Wastewater

This paper presented an experimental study of the performance,characteristics of the membrane fouling in membrane bioreactor(MBR) operation.The result showed that MBR had excellent removal efficiency.When treating municipal wastewater,the COD removal could reach 85% or above,the concentration of effluent COD was 34 mg/L,the NH4-N removal efficiency could get to 92%,the concentration of effluent NH4-N of effluent was 5 mg/L,the TN removal could exceed 86%,the concentration of effluent TN was 8 mg/L,the MLSS increased and the sludge load rate decreased.The membrane fouling rate was slow after performance,and then increased fast.After being cleaned by water and HCl solution,the TMP didn't decreased much,after being cleaned by NaOH+NaClO mixed solution,the TMP decreased greatly,which showed that the main type of the membrane fouling was organic fouling,the contribution of organic fouling was 65%.The result of EDS on membrane surface showed that inorganic fouling is not the main type of membrane fouling.