Introduction to the working principle of UV disinfection UV lamps
UV disinfection lamp application:
Ultraviolet disinfection has a wide range of uses, including hospitals, schools, nurseries, cinemas, buses, offices, homes, etc. It can purify the air, eliminate mildew, and it can also generate a certain amount of negative oxygen ions. Ultraviolet disinfection of room air is particularly fresh. In public places, UV disinfection can prevent some bacteria from spreading through the air or surfaces.
With the changes in the market and the increasing demand for products from customers, UV lamp manufacturers are developing long-life lamps such as cold cathode series, 4, 5, 6, 10, 12mm outer diameter UV lamps.
Principle of UV sterilization and disinfection:
Ultraviolet rays with appropriate wavelengths are used to destroy the molecular structure of microbial cell DNA (deoxyribonucleic acid) or RNA (ribonucleic acid), resulting in the death of growth cells and/or regenerative cells, so as to achieve the effect of sterilization and disinfection. The effective wavelength range of ultraviolet sterilization can be divided into four different bands: UVA (400-315nm), UVB (315-280nm), UVC (280-200nm) and vacuum ultraviolet (200-1000nm). Only the protective ozone layer and clouds can pass through the protective ozone layer to reach the UVA and UVB parts of the earth's surface. As far as the sterilization speed is concerned, UVC is within the peak range of microbial absorption, and can destroy the microbial DNA structure inside the microorganism in 1s to kill viruses and bacteria, while UVA and UVB are outside the peak of microbial absorption, and the sterilization speed is very slow, usually requiring several hours to play a bactericidal effect. In seconds of actual engineering, this part is actually the invalid UV part. The penetrating ability of vacuum ultraviolet rays is very weak, and the lamps and casings need to use quartz with extremely high light transmittance. Generally, the semiconductor industry is used to degrade water TOC, and it is not used for sterilization. Therefore, ultraviolet disinfection actually refers to UVC disinfection in water supply and drainage projects. Ultraviolet disinfection technology is based on modern epidemic prevention, medicine and photodynamics. It adopts high-efficiency, high-intensity, long-life specially designed UVC band ultraviolet radiation to directly kill various bacteria, viruses, parasites, algae and other pathogens in the water. purpose of disinfection.
Studies have shown that ultraviolet rays mainly kill microorganisms through the radiation damage of microorganisms (bacteria, viruses, bacillus and other pathogens) and the function of destroying nucleic acids, thereby achieving the purpose of disinfection. The action of UV light on nucleic acids can lead to bond and strand breaks, interstrand cross-links, and formation of photochemical products that alter DNA biological activity beyond the control of the microorganisms themselves.** This UV damage is also lethal.
UV disinfection is a physical method. It does not add anything to the water and has no side effects. It is superior to chlorination. It is usually used with other substances. Common combined processes include UV H2O2, UV H2O2 O3, UV TiO, and the disinfection effect will be better.
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