What is the cause of the sewage treatment choice ultraviolet sterilization disinfector?

by:Tepro     2020-04-20
Now sewage uv light sterilizer disinfection method in general can be divided into two categories, physical methods and chemical methods. The reasons for selecting the ultraviolet sterilization disinfector in sewage treatment 1. Physical methods mainly include mechanical filtration, heating, freezing, radiation, micro electrolysis, ultraviolet radiation and microwave disinfection method; 2. Chemical methods mainly include chlorine, chlorine dioxide, ozone and chloramine, halogen, metal ions, anionic surfactants and other biocide, etc. Chemical disinfection method for chlorine, ozone, most of the research and application of chlorine dioxide and chlorine amine. Sewage treatment is 1. Chlorine disinfection disinfection at present, the chlorination disinfection is the most widely used chemical disinfection method, its main advantages: ( 1) When handling water volume is larger, the unit water treatment cost is low; ( 2) Water after chlorine disinfection can maintain a certain amount of residual chlorine over a long period of time, which has a continuous sterilization ability; ( 3) Chlorine disinfection of a long history, experience more, is a more mature disinfection method. Disadvantages: after chlorine disinfection, water containing a teratogenic, carcinogenic and mutagenic THMs disinfection by-products such as harmful. 2. Ozone sterilization history almost as long and chlorine as a disinfectant, engineers in the United States in the early 1970 s began using ozone instead of chlorine disinfection of sewage. The main advantages: ( 1) Ozone disinfection responsive, sterilization of high efficiency, at the same time can effectively remove organic residues in water, such as color, smell and taste, is affected by PH, temperature is very small. ( 2) Ozone can reduce the water such as THMs halogenated disinfection by-products generation. ( 3) Ozone disinfection can reduce the concentration of total organic halide in the water. Faults: (1) to generate other disinfection by-products such as aldehydes, ketones, alcohols, if by chlorination, can produce trihalomethanes. Also can produce formaldehyde, bromate root, the international cancer research department ( IARC) Bromate root classified as carcinogenic 2 b, that may be carcinogens. 2 the solubility of ozone in water, and easy decomposition, poor stability, almost no residual disinfection capability. (3) due to the poor stability of ozone easily decomposed into oxygen, so can't bottled storage and transportation, must be on site preparation used in time, investment in equipment, power consumption, high cost; Operation management is more complex. 3. Ultraviolet radiation sterilization, although traditional chemical disinfection methods are widely used in water supply and wastewater treatment, but due to the water with chemical disinfectants more or less will produce harmful disinfection by-products, the water treatment industry of focusing on ultraviolet radiation sterilization method. A lot of research and experiments show that uv disinfection of water mainly through ultraviolet radiation of microbial organisms nucleic acid absorbed the ultraviolet light, damage and damage the function of nucleic acid kill microorganisms, and thus achieve the purpose of disinfection. Uv generally from the traditional low pressure mercury lamp making, but now there are some places use high strength and low pressure mercury lamp and medium pressure mercury lamp, for pulse uv lamp has a large number of research literature. No matter which kind of uv lamp is based on the same physical phenomenon, by fluorescent mercury in plasma discharge when the release of the electromagnetic radiation. At present abroad to study and application of ultraviolet disinfection is more, and there are a lot of sewage factory original chlorination modification into ultraviolet disinfection. The domestic research, production and application of ultraviolet disinfection sterilizer is one is less. 6. Conclusion chemical disinfection method is very important in the field of water treatment, but as people on the improvement of water quality standards and the deepening of the research disinfection by-products, and the ultraviolet sterilization mechanism of deep analysis, the continuous development of uv technology and disinfection device in design is increasingly perfect, ultraviolet radiation sterilization method has become a instead of traditional chemical disinfection method of one of the main physical disinfection method.
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