ZHANG Tian-yang,WEI Hai-juan,YAO Jie,et al.Comparison of Disinfection Efficiency of Different UV/Chlorination Combined Processes in Wastewater Treatment Plant[J].China Water & Wastewater,2021,37(17 17):19-24.
Comparison of Disinfection Efficiency of Different UV/Chlorination Combined Processes in Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
19-24
Column:
Date of publication:
2021-09-01
- Abstract:
- Wastewater disinfection is of great significance to the protection of ecological and human health safety. Especially in the recent severe situation of COVID-19 epidemic, the wastewater disinfection and safe discharge have attracted much attention. However, blindly increasing the dosage of disinfectant to enhance the sterilization efficiency of pathogenic microorganisms will lead to an increase in the formation of highly toxic disinfection by-products (DBPs) and bring new safety risks to the receiving water bodies. The effluent samples from a secondary sedimentation tank of a wastewater treatment plant in Shanghai were disinfected by different methods including chlorination, UV, UV followed by chlorination and simultaneous UV and chlorination, and the disinfection performances were compared. The UV followed by chlorination disinfection had a higher inactivation rate of 100% for fecal coliforms, and its inactivation effects on several potential pathogenic bacteria were the most balanced. In addition, the yield of DBPs was lower, and the concentration of highly toxic dichloroacetonitrile was only about 50% of that of the chlorination disinfection and simultaneous UV and chlorination disinfection, indicating that the UV followed by chlorination disinfection method had significant advantages in the synergistic control of microbial inactivation and DBPs.
Last Update:
2021-09-01