What is the principle of ultraviolet sterilization?
The principle of ultraviolet sterilization, the so-called ultraviolet sterilization is to use ultraviolet rays of appropriate wavelength to destroy DNA or RNA molecular structure in the organism cells of microorganisms, thus causing the death of growing cells or regenerative cells, in order to achieve the effect of disinfection and sterilization.
Ultraviolet disinfection is based on modern epidemic prevention, medicine and photodynamic science, and then uses UVC band ultraviolet light with special design, high efficiency, high intensity and long service life to irradiate running water, and bacteria in water, viruses, parasites and other pathogens are directly killed.
Most ultraviolet devices use traditional low-pressure ultraviolet lamp technology, and some large water plants use low-pressure high-strength ultraviolet lamp system and medium-pressure high-strength ultraviolet lamp system, because the generation of high-intensity ultraviolet rays may reduce the number of lamps by more than 90%, thus reducing its floor space, thus saving installation and maintenance costs, the ultraviolet disinfection method can also be applied to effluent with poor water quality.
The bactericidal effect of ultraviolet rays is determined by the irradiation dose received by microorganisms, and it is also affected by the output energy of ultraviolet rays and the time of use. If the ultraviolet equipment is aging, then it will also lose 30 ~ 50% strength.
The ultraviolet irradiation dose means that if a certain amount of bacteria is inactivated, it is necessary to reach the amount of ultraviolet rays of a specific wavelength. If it is lower than this value, the phenomenon of light resurrection is likely to occur, that is to say, the germs cannot be completely killed and will be revived, reducing the sterilization effect. Therefore, the higher the sterilization efficiency requirement, the greater the required irradiation dose.