Abstract: To develop an economical and practical disinfection technology of chlorine dioxide,the application of preparation process of high pure chlorine dioxide by electrolysis method in water treatment was studied.Under the best conditions，the purity of chlorine dioxide,which was prepared by electrolysis of chlorate solution with auto-catalytic cycling，can reach about 98%.Through the experiments of algae removal and sterilization,the influences of concentration of chlorine dioxide and pH of raw water on the removal rate of bacteria,chlorophyll A,and algal were discussed.Results showed that when the mass concentration of chlorine dioxide was above 2 mg/L,the removal rates of bacteria,chlorophyll A,and algal could all reached above 90%.When the mass concentration of chlorine dioxide was 2 mg/L and pH of raw water was at 6~9,the removal rates of them could not occur significant change,and the mass concentration of residual chlorine dioxide was all under 0.5 mg/L.Though accounting for the cost of water disinfection,the cost of per kilogram chlorine dioxide in the process can be controlled less than RMB 6 Yuan.When the invested amount of chlorine dioxide was at 0.5~2 mg/L,and the cost of per ton water disinfection was only RMB 0.003~0.012 Yuan. 

Key words: chlorine dioxide, electrolysis, water treatment, sterilization, algae removal