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《Environmental Science》 2007-01
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Chlorination Disinfection and By-Products for the Effluent from Membrane Bioreactor in Hospital Wastewater Treatment

SUN Ying-xue,GU Ping(School of Environmental Science and Engineering,Tianjin University,Tianjin 300072,China)  
Hospital wastewater with its high content of pathogens poses a grave problem for the community.The aim of this study was to evaluate the pre-disinfection characteristics of membrane bioreactor(MBR),and chlorination with disinfection by-products for the effluent from the MBR in a hospital wastewater treatment.The experimental results show that the removal rates of total bacteria and fecal coliform by this MBR are 2.0~3.1 lg and 2.8~4.0 lg respectively,which serves as a remarkable pre-disinfection unit.In this time-course study,sodium hypochlorite(NaClO) was used as disinfectant to inactivate the residual indicator bacteria in the effluent from MBR.When the concentration of available chlorine is 0.8 (mg·L~(-1)),the fecal coliform can been completely inactivated with contact time of 1 h,and while the THMs and HAAs produced are 16.94(μg·L~(-1)) and 32.10(μg·L~(-1)),respectively.Along with the increasing of Cl_2/DOC value,the fitting curves of THMs and HAAs both present approximately linearity relation,and the slope coefficient of HAAs is higher than that of THMs.
【Fund】: 国家高技术研究发展计划(863)项目(2003AA601130)
【CateGory Index】: X799.5
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