Comparison study on changes in water quality and toxicity of wastewater after chlorine and chlorine dioxide disinfections

摘要

Disinfection plays a key role in killing the harmful pathogens to ensure the biological safety of reclaimed wastewater for reuse, while harmful by-products might be formed and bring adverse effects on ecological system and human health. In this study, the effects of two kinds of disinfectants, chlorine and chlorine dioxide, 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 both chlorine and chlorine dioxide disinfections. UV_(230) of wastewater increased significantly after chlorine disinfection and decreased a litter after chlorine dioxide disinfection. The acute toxicity after chlorination 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.