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Use of Medium-Pressure Ultraviolet Sterilizers in Cosmetic Water Treatment

2021-07-06

Use of Medium-Pressure Ultraviolet Sterilizers in Cosmetic Water Treatment

In water treatment, the operating principle of medium-pressure UV sterilizers relies on artificial mercury (alloy) light sources capable of delivering sufficient UVC intensity for effective disinfection in engineering applications. The UV sterilizer lamps are made of quartz glass. Depending on the vapor pressure of mercury inside the lamp after it is lit and the resulting UVC output intensity, mercury lamps are classified into three types: low-pressure low-intensity mercury lamps, medium-pressure high-intensity mercury lamps, and low-pressure high-intensity mercury lamps.

　　Ultraviolet light is a type of electromagnetic wave that is invisible to the naked eye. It lies beyond the violet end of the visible spectrum, hence the name "ultraviolet." Ultraviolet radiation is one of the components of solar electromagnetic radiation. Typically, ultraviolet light is classified into four categories based on wavelength. It represents a special mode of matter's motion—a stream of discrete, unconnected particles. Each ultraviolet photon with a wavelength of 253.7 nm carries an energy of 4.9 eV.

　　When ultraviolet light shines on microorganisms, energy is transferred and accumulated. This accumulation ultimately leads to the inactivation of the microorganisms, thereby achieving the goal of disinfection. When bacteria and viruses absorb doses exceeding 3,600 to 65,000 μW/cm², they exert a powerful destructive effect on the deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) of these microorganisms.

　　It can disable the viability and reproductive capacity of bacteria and viruses, thereby eliminating them and achieving disinfection and sterilization effects. On one hand, ultraviolet light can cause abrupt mutations in nucleic acids, inhibiting their replication, transcription, and protein synthesis. On the other hand, it generates free radicals that induce photoionization, ultimately leading to cell death.

　　The sterilization principle of ultraviolet water disinfection systems is that the intensity of ultraviolet radiation emitted by the UV lamp—specifically, the irradiance level produced by the UV sterilization lamp—is inversely proportional to the distance between the lamp and the object being disinfected. When the irradiance level remains constant, the longer the disinfectant object stays within the irradiation zone and the closer it is to the sterilization lamp, the more effective the sterilization will be; conversely, the less effective it will be.

 

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Understanding Daily Maintenance and Cleaning of Ultraviolet Disinfection Equipment

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Precautions for the Maintenance and Care of Open-Channel UV Disinfection Equipment