Study on membrane-enhanced virus removal efficiency in sewage:A comparison between anaerobic and aerobic membrane bioreactors
Sewage treatment systems,as the main receiver of human domestic sewage,are important reservoirs of human enteric viruses,and also important pathways for enteric viruses to enter the water environment.Membrane bioreactors can enhance the reduction of viruses in sewage while ensuring stable effluent quality.However,currently the researches regarding the differences in the efficacy and mechanisms of virus removal between aerobic(AeMBR)and anaerobic(AnMBR)membrane bioreactors are relatively limited.Based on this,the removal efficiency of viruses from sewage was compared between AeMBR and AnMBR under the same operating conditions,and the differences in virus adsorption by sludge,virus inactivation in sludge mixture,and membrane fouling affecting virus interception were also explored.The results showed that both AeMBR and AnMBR achieved a virus removal efficiency of 3 log in sewage,while their removal mechanisms were different.The virus removal rate of AeMBR rapidly increased to 2 log at the beginning of reactor operation,while the virus removal rate of AnMBR increased with the intensification of membrane fouling,and was significantly correlated with TMP(r=0.81,P＜0.05).The virus adsorption capacity of anaerobic sludge was higher than that of aerobic sludge,while the inactivation rate of viruses in aerobic sludge mixed liquor was higher than that in anaerobic sludge mixed liquor.The cake layer was the main contributor to the virus interception among the membrane fouling components of the membrane bioreactor.Taking the unit membrane resistance as the calculation basis for virus retention efficiency,among the membrane pollution components of AeMBR,the unit membrane resistance of irreversible fouling and the original membrane accounted for the highest virus retention efficiency.In AnMBR,the unit membrane resistance of organic fouling in the pore channels of membrane pollution contributed most to the virus retention efficiency.
国家科技期刊平台
NSTL
万方数据
