What is Ultraviolet? And How Does Ultraviolet Water Treatment Work?

Ultraviolet (UV) is a form of electromagnetic radiation with a wavelength from 10nm to 400nm, shorter than that of visible light, but longer than X-rays. UV water treatment works by exposing microorganisms (such as cryptosporidium, giardia lamblia and more) to UV radiation, via a special UV light bulb, which disrupts their DNA and disables their ability to replicate.

In many of water purifiers and ultra-purification water machines, ultraviolet light is an indispensable part. The post-processing used in the purification process is usually divided into two bands, 254nm and 185nm.

254nm is mainly for bactericidal effect. In fact, ultraviolet rays cannot directly kill bacteria, which is often a common myth. Ultraviolet rays only destroy the DNA structure of bacteria so that they cannot reproduce and die. 254nm is generally placed in front of RO to prevent bacteria from contaminating the membranes. 185nm can produce hydroxyl radicals in the water to quickly oxidize and decompose the participating organics in the water into CO2 and H2O. It is often used to remove TOC, that is, to reduce the content of organics in the water through the action of UV and ultraviolet light.

Components of a UV System

A UV water treatment system includes four main parts:

  • The chamber
  • The UV lamp
  • The quartz sleeve
  • The controller unit (sometimes called a ballast)

Application of UV in Water treatment System

1. TOC removal
2. Disinfection
3. Ozone decomposition
4. Removal of chlorine and chloramines



1. Quickly and effectively kill all kinds of bacteria, viruses and other microorganisms;
2. Effectively degrade chloride in water through photolysis;
3. Simple operation and convenient maintenance;
4. Small foot space but with a large amount of treated water;
5. No contamination; environmental protection, no toxic side effects;
6. Low investment cost and operating cost and convenient equipment installation;
7. The unique inner wall treatment process is designed using optical principles to maximize the use of ultraviolet rays in the cavity and double the sterilization effect.

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