Application and Engineering Cases of UV Disinfection Technology in WTPs
Compared with chlorine disinfection,ozone disinfection and other chemical disinfection,ultraviolet(UV)disinfection has the advantages of broad-spectrum sterilization,short disinfection contact time,no chemicals,no disinfection by-products,and easy to achieve automatic control.A water treatment plant(WTP)in Zhejiang with a water supply capacity of 2x105 m3/d uses a combined UV and sodium hypochlorite disinfection process,making full use of the advantages of UV disinfection technology with no disinfection by-products and the continuous disinfection capability of sodium hypochlorite disinfection.The UV dose is set at 40.00 mJ/cm2,the UV penetration rate is 90.00％,and the actual UV dose is 48.99 mJ/cm2.After UV disinfection,the total number of colonies is not detected.The amount of supplemental chlorine dropped 30％compared to the conventional dosage.The application of UV disinfection can reduce the cost of chemical injection while taking into account the chemical and biological safety of drinking water.The successful application of this project provides experience for upgrading the disinfection process in the same type of WTPs.
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