Study on the Genotoxicity of Source Water and Drinking Water during Chlorine and Chloramine Disinfection using the Umu-Test

摘要

Potential effects of chlorine and chloramine disinfection on genotoxicity of source water and effluent of ozone-biological activated carbon (O3-BAC) were investigated using umu-test. It is found that genotoxicity of both source water and effluent of O3-BAC became higher after disinfection. Genotoxicity after chlorine disinfection was higher than that after chloramines disinfection for 24h under the same initial dosage, which demonstrated that chloramine disinfection was safer than chlorine disinfection in the aspect of genotoxicity for drinking water. For chlorine disinfection, changes in genotoxicity of source water and effluent of O3-BAC were similar, which increased firstly then decreased and finally increased again with initial dosage increasing. For chloramine disinfection, genotoxicity of source water and effluent of O3-BAC both didn’t change that much. Further more, effect of different disinfection time on genotoxicity of source water and effluent of O3-BAC was also studied. Results of this study were of some engineering significance for optimizing the operation of water plants, but further study on the forming mechanisms of genotoxicity of drinking water after disinfection is urgently required.