Application of UV disinfection technology in drinking water treatment since 1993 in the US city of Milwaukee outbreak of cryptosporidiosis acclaimed, because chlorine disinfection can not effectively kill Cryptosporidium oocysts, and found that ultraviolet for Cryptosporidium oocysts have a good killing effect. Also within the scope of conventional disinfectants amount of UV disinfection does not produce harmful by-products, application examples and therefore in Western countries is growing rapidly in recent years, especially in small water works. For this purpose the establishment of the International Ultraviolet Association in 1999. Household water purifiers United States has always been relatively slow to respond to the application of new technologies in the water treatment process, the conservative, but the application of UV technology is the use of quick action unexpected. US Environmental Protection Agency confirmed in the laboratory ultraviolet disinfection to inactivate Cryptosporidium is only 5 years after the effective approved the application of UV disinfection in drinking water. Large water plant will be built this year as Seattle water UV disinfection systems, the New York Water Company 7.8 million m3 / d of potable water has been decided to use ultraviolet disinfection, currently in preparation for construction. UV disinfection advantages: 鈶?the effect with a broad spectrum of pathogenic microorganisms, disinfection high efficiency; 鈶?of Cryptosporidium oocysts have disinfection effects; 鈶?does not produce toxic and harmful byproducts; 鈶?not increase AOC, BDOC damage other network byproduct quality biological stability; 鈶?can reduce the smell, taste and degradation of trace organic pollutants; 鈶?small footprint, disinfection by the water temperature, PH small impact. The main disadvantage of UV disinfection are: 鈶?no continuous disinfection, chlorine need be used in conjunction with; 鈶?easy to scale quartz tube wall, reducing the disinfecting effect; 鈶?water disinfection by SS and turbidity greater impact; 鈶?are killed bacteria possible resurrection; 鈶?domestic use less experience.
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