[Characteristics of Disinfection By-products and Genotoxicity During Drinking Water Disinfection with Potassium Monopersulfate Compound Powder]

Abstract

The qualitative analysis for by-products in the course of disinfection of the raw water and the effluent of GAC in Beijing Tiancuishan Drinking Water Treamtment Plant by potassium monopersulfate compound powder was determined. Halogen disinfection by-products during disinfection process by potassium monopersulfate compound powder was evaluated in a bench scale by comparing with chlorine disinfection process, and the genotoxicity evaluation of potassium monopersulfate compound powder and chlorine disinfection processes was also conducted by umu-test. The results showed that there were small changes in the organic pollutant components of water samples after disinfection by potassium monopersulfate compound powder, while some new halogen disinfection by-products were generated. Disinfection with potassium monopersulfate compound powder generated much less trihalomethanes (THMs) and haloacetic acids (HAAs) than chlorination disinfection. Moreover, the results of umu test indicated that the raw water and the effluent of GAC presented lower genotoxicity after potassium monopersulfate compound powder disinfection than chlorine disinfection. However, there was a risk for safety at a high level of organic matters and disinfectant dosage during potassium monopersulfate compound powder disinfection process.

Keywords: chlorine disinfection; disinfection by-products; genotoxicity; potassium monopersulfate compound; umu-test.