污水氯、二氧化氯消毒处理中水质及毒性变化的比较

分别从水质和毒性2方面比较了氯、二氧化氯消毒对污水的影响.结果表明:在水质特性方面,氯消毒对污水色度影响不大,而二氧化氯消毒明显降低了污水的色度;氯、二氧化氯消毒前后污水的DOC基本没有变化;氯消毒后污水的UV₂₃₀明显增加,二氧化氯消毒后污水的UV₂₃₀略有降低,当二者投加量均为30mg/L时,氯消毒使污水的UV₂₃₀增加约0.7cm^-1,二氧化氯消毒使污水的UV₂₃₀降低约0.05cm^-1.在毒性生成方面,氯、二氧化氯消毒产生的急性毒性均随消毒剂投加量的增加而增大,氯消毒产生的急性毒性明显高于二氧化氯消毒;氯消毒在一定程度上增大了污水的遗传毒性,而二氧化氯消毒在一定程度上降低了污水的遗传毒性.

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 UV₂₃₀ of wastewater and chlorine dioxide disinfection slightly decreased UV₂₃₀ of wastewater.When the disinfectants dosage was 30mg/L,UV₂₃₀ 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.