Application of UV sterilizer in sewage treatment and sterilization process

In order to ensure public health and safety, and to prevent the spread of infectious diseases, urban sewage facilities should be equipped with chlorine disinfection or UV disinfection disinfection facilities. The traditional method of sterilization after sewage treatment is to use chlorine or chlorine dioxide, but these two The chemical substance itself is a toxic gas, and the storage will bring unstable factors. Chlorine or chlorine dioxide will also react with the organic matter in the water to interfere with the disinfection. In addition, the reaction product halogenated hydrocarbon, haloform, etc. Toxic is also a recognized carcinogen.

UV sterilizer disinfection and sterilization is characterized by high-intensity ultraviolet light for instant disinfection of water bodies, and no secondary pollution, does not change the physical and chemical properties of water bodies, a wide range of disinfection, online detection of disinfection factors, predict disinfection effects. In China, more and more sewage treatment plants have accepted and accepted the disinfection and sterilization of sewage UV disinfectors. The sewage treatment plants in Shanghai and Guangzhou are using a large number of ultraviolet disinfectors.

The principle of ultraviolet disinfection for water disinfection is that the ultraviolet light of 25.37 nm is irradiated by the bacterial virus, and is absorbed by the DNA in the bacterial virus, thereby destroying the DNA structure, thereby preventing the bacterial virus from reproducing the offspring and achieving the purpose of sterilization. The sterilization efficiency of the UV sterilizer is generally described by the dose. The larger the dose, the better the bactericidal effect. The dose is the product of the UV intensity and the irradiation time.

China is developing China, the progress of urbanization is accelerating, industrial enterprises are developing rapidly, industrial wastewater discharge exceeds the standard, urban domestic wastewater is not treated, and direct discharge brings more and more serious pollution to rivers, lakes and seas. These pollutions can lead to lakes. Oxygen enrichment leads to the production of a large number of algae, destroys the ecological balance, pollutes the groundwater, and makes human drinking water more and more seriously affected, affecting human health and leading to an important source of pollution for many diseases. If a pipe-type UV sterilizer is used instead of chlorine or ozone, it is also a cost saving and is considered to be a high-performance, low-cost disinfection method.

The Chinese government is very concerned about water pollution and has issued a series of laws and regulations to strengthen the control and management of water resources. By the end of 2004, there were 708 sewage treatment plants in 661 cities nationwide, with a treatment capacity of 49.12 million cubic meters per day, and the urban sewage treatment rate was 45%. According to the 15th plan to 2010, the sewage treatment rate of cities and towns nationwide. More than 70%. However, about half of the cities currently do not have sewage treatment plants.

The UV disinfection sterilization technology has existed since 1900, but it has been used in hospitals for a long time. The specifications are single and the lifespan is short. The application technology has not been developed for a long time. UV application technology has been used in other industries in recent years. Air conditioners, refrigerators, disinfection cabinets, and installation of ultraviolet rays were once hot. Especially after SARS has been used in many industries, the application of pipeline UV sterilizer and sewage UV sterilizer in water treatment is popular in Canada and the United States. In 1995, the penetration rate in the United States has reached 5%, and it has increased year by year. However, in China, the application of pipeline UV sterilizers in water treatment has only begun to form a climate in recent years. In particular, there are many successful cases in wastewater disinfection of wastewater UV sterilizers. .