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Ultraviolet disinfection technology and development trend of ultraviolet light source

  • 2020-05-05
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Ultraviolet disinfection technology and development trend of ultraviolet light source

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  • 2020-05-05
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Ultraviolet disinfection technology

Ultraviolet (uv) between spectrum and X-ray, according to the wavelength, ultraviolet ray can be subdivided into near ultraviolet (UVA: 320 ~ 400 nm), the uv (UVB: 280 ~ 320 nm), deep ultraviolet (UVC: 200 ~ 280 nm) and vacuum ultraviolet (VUV: 10 ~ 200 nm) [1, 2], the UVC band of uv energy is highest, but due to its shortest wavelength, is absorbed in the atmosphere, lead to serious attenuation, near the ground almost does not contain the wavelength of ultraviolet light in the solar spectrum, also known as "blind" ultraviolet band.
The mechanism of inactivation of microorganisms by ultraviolet light is not complicated. It mainly USES the absorption of the nucleic acid of microorganisms to the ultraviolet light, destroys its nucleic acid function, and makes the microorganisms stop replicating, so as to realize disinfection and purification. It should be pointed out that, not the ultraviolet band have against microorganisms inactivated function, only in the UVC band located at 240 ~ 260 nm range of uv easily absorbed by the bacteria and effective role in the DNA of the bacteria, interfere with the normal replication, killing bacteria [3], and UVA and UVB rays in the range of microbial absorption peak, so the sterilization efficiency is very low, belongs to the ultraviolet part of the [4] of disinfection is invalid.
No chemicals are involved in the ultraviolet disinfection process and no disinfection by-products are produced. Data show that under the condition of UVC irradiation intensity of 30 mW/cm2, the inactivation of nearly 100% of most bacteria can be achieved within 1 s time [5]. Therefore, ultraviolet disinfection technology is a physical disinfection method, with the advantages of broad-spectrum efficiency, fast and convenient, environmentally friendly and harmless, simple and practical, and easy to operate [6].
The application of ultraviolet ray in disinfection field has a long history. As early as the 19th century, Downes and Blunt mentioned it in their research

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