What Is an Ultraviolet Sterilizer?

Ultraviolet sterilizer refers to a device that disinfects domestic drinking water by using ultraviolet mercury lamp as the light source and using the 253.7nm ultraviolet radiation emitted by the mercury vapor in the lamp tube as the main spectral line.

Ultraviolet sterilizer

Structural form of UV sterilizer: UV sterilizer is divided into closed type and open type according to the boundary of water flow.

1) Use environmental conditions: The sterilizer should be able to work normally under the following conditions.

(1) Incoming water quality

1. High-efficiency sterilization: The sterilization of bacteria and viruses with ultraviolet rays can reach 99% -99.9% in one to two seconds.

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Ultraviolet sterilizer is widely used and has high value in water treatment. It is to destroy and change the DNA structure of microorganisms by ultraviolet light, so that the bacteria will die immediately or can not reproduce offspring to achieve the purpose of sterilization. What really has bactericidal effect is ZXB ultraviolet rays, because ultraviolet rays in the C band are easily absorbed by the DNA of the organism, especially the ultraviolet rays around 253.7nm are the best. Ultraviolet sterilizer is a pure physical sterilization method, which has the advantages of simplicity, convenience, broad-spectrum efficiency, no secondary pollution, easy management and automation. With the introduction of various new-designed ultraviolet lamp tubes, the scope of application of ultraviolet sterilization has also continued. Expanding.

Europe is the birthplace of UV disinfection of drinking water. 1906 ~ 1909, France

Different regions have different application methods for ultraviolet sterilization. The ultraviolet sterilization process has many advantages and also has disadvantages. The main disadvantage is that it does not have the ability to maintain continuous disinfection of the pipe network. There are some differences in the use of UV disinfection technology in Europe and North America. In some water plants in the Netherlands, Austria, and Germany in Europe, drinking water directly enters the water supply pipe network after ultraviolet disinfection. According to statistics, most water plants in the Netherlands use ultraviolet disinfection alone, and there is no residual chlorine at the end of the pipe network. The reason is that the European pipeline network is in a better condition, the pipeline network system is relatively small, and the bioassimilable organic carbon in the water is low. In order to avoid the residual chlorine from generating disinfection by-products in the pipeline network, ultraviolet disinfection is often used alone. Another reason is that these European countries are usually in higher latitudes, the water temperature is lower all year round, and the ability of microbial regeneration in the pipe network is weak. North American drinking water regulations stipulate that there must be a certain amount of residual chlorine in tap water to control the secondary pollution of the pipe network. The situation in our country is more similar to that in the United States. When the biosynthesizable organic carbon (AOC) is less than 20g / L, it is not necessary to add chlorine after ultraviolet rays. When the AOC is more than 50g / L, it is necessary to maintain the residual chlorine above 0.3mg / L. Domestic municipal water supply systems that use surface water sources have relatively high levels of organic matter in the water, so ultraviolet rays need to be used in combination with chlorine and chloramine to ensure the microbial safety of water quality in the pipe network. However, small-scale water supply systems in villages and towns that use groundwater are entirely possible only with UV disinfection, especially in areas with low water temperatures in the north, provided that the design and equipment must be qualified. The research results of the 11th Five-Year Science and Technology Support Plan also fully prove this ^[1] .