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Ultraviolet Germicidal Irradiation (UVGI)
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How UVGI Purification Works
Ultraviolet light is electromagnetic radiation with wavelengths shorter than visible light. UV can be separated into various ranges, with short range (UVC) considered "germicidal UV." At certain wavelengths UV is mutagenic to bacteria, viruses and other micro-organisms. At a wavelength of 2,537 Angstroms (254 nm) UV will break the molecular bonds within micro-organismal DNA, producing thymine dimers in their DNA thereby destroying them, rendering them harmless or prohibiting growth and reproduction. It is a process similar to the UV effect of higher wavelengths (UVB) on humans, such as sunburn or sun glare. Micro-organisms have less protection from UV and cannot survive prolonged exposure to it.
A UVGI purification system is designed to expose environments
such as water tanks, sealed rooms and forced air systems
to germicidal UV. Exposure comes from germicidal lamps
that emit germicidal UV electromagnetic radiation
at the correct wavelength, thus irradiating the environment.
The forced flow of air or water through this environment
ensures the exposure. |
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