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Learn about Ultraviolet germicidal irradiation and air disinfection
Source: | Author: COMING | Release time : 2021-07-22 | 49 Views: | 分享到:
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.[1] UVGI is used in a variety of applications, such as food, 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.[1] UVGI is used in a variety of applications, such as food, air, and water purification.

 

UV-C light is weak at the Earth's surface since the ozone layer of the atmosphere blocks it.[2] 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. UVGI can be coupled with a filtration system to sanitize air and water.

 

The application of UVGI to disinfection has been an accepted practice since the mid-20th century. It has been used primarily in medical sanitation and sterile work facilities. 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. UVGI has found renewed application in air purifiers.

 

Air disinfection

UVGI can be used to disinfect air with prolonged exposure. In the 1930s and 40s, an experiment in public schools in Philadelphia showed that upper-room ultraviolet fixtures could significantly reduce the transmission of measles among students.[3] In 2020, UVGI is again being researched as a possible countermeasure against the COVID-19 pandemic.[4][5]

Disinfection is a function of UV intensity and time. For this reason, it is in theory not as effective on moving air, or when the lamp is perpendicular to the flow, as exposure times are dramatically reduced. However, numerous professional and scientific publications have indicated that the overall effectiveness of UVGI actually increases when used in conjunction with fans and HVAC ventilation, which facilitate whole-room circulation that exposes more air to the UV source.[6][7] Air purification UVGI systems can be free-standing units with shielded UV lamps that use a fan to force air past the UV light. Other systems are installed in forced air systems so that the circulation for the premises moves microorganisms past the lamps. Key to this form of sterilization is placement of the UV lamps and a good filtration system to remove the dead microorganisms.[8] For example, forced air systems by design impede line-of-sight, thus creating areas of the environment that will be shaded from the UV light. However, a UV lamp placed at the coils and drain pans of cooling systems will keep microorganisms from forming in these naturally damp places.




1.NIOSH eNews. National Institute for Occupational Safety and Health. April 2008. Retrieved 4 May2015.

2. NASA. 2003. Archived from the original on February 16, 2013. Retrieved4 May 2015.

3.  Wells, W.F.; Wells, M.W.; Wilder, T.S. (January 1942). American Journal of Epidemiology35 (1): 97–121.Retrieved 2020-11-25.

4.  Chang, Kenneth (2020-05-07). The New York TimesISSN 0362-4331. Retrieved 2020-05-11..

5. Beggs CB, Avital EJ (2020). PeerJ. 8:e10196.doi:10.7717/peerj.10196.

6. IES Committee Reports. 5 May 2020. Retrieved 14 September 2020.

7. Ko, Gwangpyo; First, Melvin; Burge, Harriet (Jan 2002).  Environmental Health Perspectives101 (1): 95–101

8. CaluTech UV Air. Retrieved 2006-12-05.



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