From UPSC perspective, the following things are important :
Prelims level : UV germicidal irradiation
Mains level : Can always be used as an example
The DRDO has developed an Ultra Violet (UV) Disinfection Tower for rapid and chemical-free disinfection of high infection-prone areas.
We have a UV filter in our home based water filter. Ever wondered, how do UV rays kill viruses/bacteria?
- The UV blaster is a UV based area sanitizer designed and developed by Laser Science & Technology Centre (LASTEC), the Delhi based premier laboratory of DRDO.
- It is useful for high tech surfaces like electronic equipment, computers and other gadgets in laboratories and offices that are not suitable for disinfection with chemical methods.
- The product is also effective for areas with a large flow of people such as airports, shopping malls, metros, hotels, factories, offices, etc.
How does it work?
- The UV based area sanitizer may be used by remote operation through laptop/mobile phone using wifi link.
- The equipment has six lamps each with 43 watts of UV-C power at 254 nm wavelength for 360-degree illumination.
- For a room of about 12 x 12 feet dimension, the disinfection time is about 10 minutes and 30 minutes for 400 square feet area by positioning the equipment at different places within the room.
- This sanitizer switches off on the accidental opening of a room or human intervention.
Back2Basics: UV germicidal irradiation
- UV irradiation is a disinfection method that uses short-wavelength ultraviolet rays to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unable to perform vital cellular functions.
- UVGI is used in a variety of applications, such as food, air, and water purification.
- UVGI devices can produce strong enough UVC light in circulating air or water systems to make them inhospitable environments to microorganisms such as bacteria, viruses, moulds, and other pathogens.
- UVGI can be coupled with a filtration system to sanitize air and water.
- 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.