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FAQ – UV Disinfection of Water

Posted on January 3, 2020 FAQ – UV Disinfection of Water
What is a UV disinfection system?
Ultraviolet (UV) is a physical water treatment method that helps disinfect water. It inactivates pathogens, microbes, and microorganisms by permanently destroying their DNA, rendering them ineffectual so they can’t reproduce, which eliminates the risk of infection. It makes use of no chemicals, so its 100% chemical-free. UV is also used to remove some chemical contaminants from water such as chlorine, ozone, and total organic carbon (TOC). Thus, the UV disinfection system is a great option for fast, safe, and effective water treatment at an economical price.
What is the purpose of disinfection?
The primary purpose of disinfection is to offer an optimum level of water purification. By making use of UV technology for water disinfection, you are ensuring that the drinking water is free from harmful pathogens and microorganisms. Being a natural purification process, UV also ensures that the taste of the water, its colour, odour, and pH levels are not altered. Also, UV water disinfection is an FDA approved method, which also helps reduce water wastage.
What are the methods of disinfection of water?
Historically, the boiling of water was the widely used method for water disinfection. In modern times, chemical, physical, ozonation, and distillation are a few methods used for disinfection. Here, chemical and physical are the two popular methods for disinfection of water. The chemical method makes use of chemicals like chlorine, bromine iodine, silver, etc. The physical method, on the other hand, makes use of ultraviolet (UV) lights, gamma-ray irradiation, etc. Out of the two, using UV technology for water disinfection is found to be a more reliable, cost-effective and safe way to purify drinking water.
Which UV wavelength is effective For disinfection?
Ultraviolet (UV) light is energy within the electromagnetic spectrum which is invisible to the human eye. It works at a specific range of wavelengths, wherein a wavelength of 253.7 nanometers (billionths of a meter) is used for water disinfection since it has the peak germicidal efficiency. Here, it is important to note that the correct UV dose is applied in the water, as different organisms require different levels of UV dose to disrupt their DNA.
Does UV disinfect bacteria in the water?
Yes, it does. A UV disinfection system purifies water to the highest level. It inactivates up to 99.99% of all water-borne microorganisms, including bacteria, viruses, cysts, and protozoa provided the correct dose is applied. UV is also an effective and safe solution that helps destroy chlorine-resistant microorganisms without the use of any chemicals.
Is Chlorine effective for the disinfection of water?

The most popular chemical used for water disinfection is chlorine which, is largely effective except that there are some microbial pathogens, such as Cryptosporidium and Giardia, that are resistant to chlorine disinfectant, also chlorine when added to our water, combines with other natural compounds to form Trihalomethanes (chlorination byproducts), or THMs. These chlorine byproducts trigger the production of free radicals in the body, causing cell damage, and are said to be carcinogenic.

Due to these reasons world over Water treatment operators, both large and small, are turning to ultraviolet radiation (UV) as an alternative to reduce or eliminate the use of chlorine for disinfection since Ultraviolet (UV) water treatment systems compared to traditional water treatment methods, are reliable, effective, completely chemical-free, environmental-friendly, and create no harmful by-products.

 

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