The secondary water supply is equipped with an ultraviolet sterilizer. Under normal circumstances, tap water must be disinfected before leaving the factory. When leaving the factory, it is necessary to ensure that a certain concentration of disinfectant remains in the water to meet the continuous disinfection requirements. However, during the transportation of tap water through the pipe network, the disinfectant is continuously consumed. After the tap water reaches the secondary water supply residential area, it is usually stored in the water tank in the pump room, and finally supplied to users through pressurized equipment. Usually, the water body is stored in the water tank for a relatively long time, and if it is not updated in time, there is a risk of water quality degradation.
In order to ensure the water quality safety of the "last mile" of urban water supply, in the secondary water supply transformation, for communities with water tanks or at the end of the pipe network, as long as the conditions are available on site, ultraviolet disinfection facilities will be added in the secondary water supply pump room. The light band with disinfection function in ultraviolet light is 200 to 300nm, which mainly destroys the genetic material (DNA and RNA) of microorganisms in water, so that they cannot continue to divide and replicate, so as to achieve the purpose of disinfection. At the same time, ultraviolet rays can also have a certain destructive effect on the cytoplasm and cell walls of microorganisms.
In this way, on-line disinfection can be realized. When the water flows through the ultraviolet sterilizer, the tap water is deeply purified under ultraviolet light. It has been determined that ultraviolet rays can efficiently inactivate bacteria and other microorganisms, and at the same time, the disinfection speed is fast, generally only a few seconds to tens of seconds, and the disinfection process will not produce side effects. It is a hygienic, safe and environmentally friendly disinfection technology, generally placed The last link of the water supply system plays a gatekeeping role. Through the "double insurance" of chlorine disinfection in water plants and ultraviolet disinfection of secondary water supply, the water quality of secondary water supply can be greatly guaranteed.
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