Comparison of the Quality and Toxicity of Wastewater After Chlorine and Chlorine Dioxide Disinfections

The effects of chlorine and chlorine dioxide disinfections on quality and toxicity of wastewater were compared.The experiment results showed that chlorine disinfection had no obvious effect on wastewater color,while chlorine dioxide disinfection decreased wastewater color observably.The DOC of wastewater did not change much after chlorine and chlorine dioxide disinfections.Chlorine disinfection significantly increased UV_(230) of wastewater and chlorine dioxide disinfection slightly decreased UV_(230) of wastewater.When the disinfectants dosage was 30mg/L,UV_(230) increased about 0.7cm~(-1) after chlorine disinfection and decreased about 0.05cm~(-1) after chlorine dioxide disinfection.The acute toxicity of wastewater increased with increasing disinfectants dosage for both chlorine and chlorine dioxide disinfections and the acute toxicity after chlorine disinfection is much stronger than that after chlorine dioxide disinfection.The genotoxicity of wastewater increased slightly after chlorine disinfection and decreased slightly after chlorine dioxide disinfection.