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June 23, 2020

UV Germicidal Lamp


Classification
The only artificial mercury (alloy) lamp light source that can output enough UVC intensity for engineering disinfection. Ultraviolet germicidal lamps are made of quartz glass. Mercury lamps are divided into three types according to the difference in mercury vapor pressure and the intensity of ultraviolet output in the lighted lamp: low-pressure low-intensity mercury lamps, medium-pressure high-intensity mercury Lamps and low-pressure high-intensity mercury lamps.
uv sterilization
Sterilization effect
The bactericidal effect is determined by the dose of radiation received by the microorganisms, and it is also affected by the output energy of ultraviolet rays, which is related to the type of lamp, light intensity and use time. As the lamp ages, it will lose 30%-50% of its intensity . Ultraviolet irradiation dose refers to the amount of ultraviolet rays of a specific wavelength required to reach a certain bacterial inactivation rate: irradiation dose (J/m2) = irradiation time (s) × UVC intensity (W/m2) The greater the irradiation dose, the greater the disinfection efficiency High, due to the size requirements of the equipment, the general irradiation time is only a few seconds. Therefore, the UVC output intensity of the lamp becomes the most important parameter to measure the performance of ultraviolet light onclick="g('sterilization equipment');"> disinfection equipment performance. In urban sewage disinfection, the average average dose is above 300 J/m2. Below this value, there may be a photo-resurrection phenomenon, that is, the pathogen cannot be completely killed. When it flows out of the channel and receives visible light irradiation, it is reactivated and the sterilization effect is reduced. The higher the sterilization efficiency requirements, the greater the radiation dose required. The main factor that affects the microbes receiving sufficient ultraviolet radiation dose is the light transmittance (at 254 nm). When the UVC output intensity and irradiation time are fixed, the change in light transmittance will cause the microbes to actually receive a change in dose.

Advantage
Most ultraviolet devices use traditional low-pressure ultraviolet lamp technology, and some large water plants use low-pressure high-intensity ultraviolet lamp systems and medium-pressure high-intensity ultraviolet lamp systems. Due to the generation of high-intensity ultraviolet rays, the number of lamps may be reduced by more than 90%, thus The area is reduced, installation and maintenance costs are saved, and the ultraviolet disinfection method is also applicable to effluent with poor water quality.

Research status

At present, there are few domestic research, production and application of sewage ultraviolet sterilizers. Gu Pingren from Tianjin University took the advanced treatment of Tianjin Jizhuangzi Sewage Treatment Plant as the research object, conducted static and dynamic tests, determined the relationship between the ultraviolet dose and the survival rate of bacteria, and designed ultraviolet rays that can produce turbulent flow Disinfector, a closed sterilizer developed and produced by Duoyuan Water Environmental Technology Industry (China) Co., Ltd. can handle 100~500m3/h water volume, and has been used in onclick="g('swimming pool');">circulating water disinfection in swimming pools There are applications, modular open sterilizers can be specifically designed and installed according to user needs. The advanced treatment of Taoziwan Wastewater Treatment Plant in Yantai City uses an open ultraviolet disinfection process, which can provide 4×104m3/d of industrial reuse water to the city.


Best regards,

Mandy Huang

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