![]() ![]() In 1955, UV water treatment systems were applied in Austria and Switzerland by 1985 about 1,500 plants were employed in Europe. The prototype plant was shut down after a short time due to poor reliability. Using UV light for disinfection of drinking water dates back to 1910 in Marseille, France. The 1903 Nobel Prize for Medicine was awarded to Niels Finsen for his use of UV against lupus vulgaris, tuberculosis of the skin. UV has been a known mutagen at the cellular level for over 100 years. Blunt published a paper describing the sterilization of bacteria exposed to short-wavelength light. UVGI has found renewed application in air purifiers. ![]() Increasingly, it has been employed to sterilize drinking and wastewater since the holding facilities are enclosed and can be circulated to ensure a higher exposure to the UV. It has been used primarily in medical sanitation and sterile work facilities. The application of UVGI to disinfection has been an accepted practice since the mid-20th century. UVGI can be coupled with a filtration system to sanitize air and water. ![]() Recent studies have proven the ability of UVC light in inactivating the novel Coronavirus ( COVID-19). UVGI devices can produce strong enough UV-C light in circulating air or water systems to make them inhospitable environments to microorganisms such as bacteria, viruses, molds, and other pathogens. UV-C light is weak at the Earth's surface since the ozone layer of the atmosphere blocks it. UVGI is used in a variety of applications, such as food, surface, air, and water purification. Ultraviolet germicidal irradiation ( UVGI) is a disinfection method that uses short- wavelength ultraviolet ( ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions. A low-pressure mercury-vapor discharge tube floods the inside of a biosafety cabinet with shortwave UV light when not in use, killing microbes on irradiated surfaces. ![]()
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