1. Ultraviolet sterilization is carried out through ultraviolet rays, and ultraviolet rays with a wavelength of 200-300 nm have sterilizing capabilities. 2. The mechanism of ultraviolet sterilization is mainly because it induces the formation of thymine dimers and the cross-linking of DNA chains, thereby inhibiting DNA replication. 3. Radiation can ionize oxygen in the air into (O), and then oxidize O2 into ozone (O3) or water (H2O) into hydrogen peroxide (H2O2). Both O3 and H2O2 have bactericidal effects. Ultraviolet disinfection of the surface of items; 1. Irradiation method: Use a UV sterilizer to move at close range to irradiate the items to be disinfected, or use a hanging ultraviolet lamp to irradiate. For small items, put the UV rays into a disinfection box. 2. Dosage version and time of irradiation: Different types of microorganisms have different sensitivities to ultraviolet rays. Therefore, when using ultraviolet rays for disinfection, the irradiation dose must be used to achieve the irradiation dose required to kill the target microorganisms. The advantages of ultraviolet disinfection are as follows: 1. No impurities are introduced into the water, and the physical and chemical properties of the water remain basically unchanged; 2. The chemical composition of the water (such as chlorine content) and temperature changes generally do not affect the disinfection effect; 3. The odor in the water is not increased and taste, and does not produce disinfection by-products such as trihalomethanes; 4. It has a wide sterilization range, fast speed, and short processing time. Under a certain radiation intensity, it only takes more than ten seconds to kill common pathogenic microorganisms, some germs that cannot be inactivated by chlorine disinfection, and it can also control some higher aquatic organisms such as algae and red worms to a certain extent. ; 5. Over-treatment generally does not cause water quality problems; 6. The integrated equipment has a simple structure, is easy to install, is compact and lightweight, has small water head loss, and occupies a small area; 7. is easy to operate and manage, easy to realize automation, and has a well-designed system equipment operation. Maintenance workload is very small.