Unlike chemical approaches to water disinfection, UV light provides rapid, effective inactivation of microorganisms through a physical process.
When bacteria, viruses and protozoa are exposed to the germicidal wavelengths of UV light, they are rendered incapable of reproducing and infecting.
What kind of UV light is used for disinfection?
Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.
How long does it take for UV light to kill bacteria?
The average bacterium will be killed in ten seconds at a distance of six inches from the lamp in an American Ultraviolet Germicidal Fixture.
Does ultraviolet light kill germs?
A common one is UV-B. UV-C has higher frequency of the UV light that can kill germs. It is part of the ultraviolet light spectrum. A: Only prolonged exposure (ie. 8 or more hours) to UV-C light will be harmful for human. A: UV-C light is highly effective at penetrating thin-walled germs like viruses and bacteria.
How effective is UV sterilization?
UV has been proven effective against a broad spectrum of microorganisms. Bacteria are generally easier to inactivate than viruses, with fungi and spores being even harder to inactivate with UV. Safety. As UV-C provides radiation, it is not safe to be in the room while UV-C disinfection is taking place.
Photo in the article by “Wikipedia”