Ultraviolet water disinfection technology is a physical treatment without chemical disinfectants. Moreover, its efficiency on microorganisms makes it particularly interesting.

UV light - Definition

Ultraviolet or “UV” is a type of energy found in the electromagnetic spectrum, between X-rays and visible light. UV radiation is not perceptible to the human eye. However, we are exposed to this every time we go out in the sun. In fact, UV light is responsible for sunburn.

Their wavelength is between 100 nm and 400 nm. This radiation is split into three categories, each with increasing energy: UV-A (315 – 400 nm), UV-B (280 – 315 nm) and UV-C (100 – 280 nm). For disinfection, we are only interested in UVC.

Principle of disinfection by UV radiation

UV water purification systems use special lamps that emit UVC light of a particular wavelength that has the ability, depending on its length, to disrupt the DNA of microorganisms. These UV light waves are also called spectrum or germicidal frequency. The frequency used in killing microorganisms is 254 nanometers (nm). When water passes through a UV water treatment system, the radiation, generated by a UV lamp contained in a reactor (usually stainless steel), reaches pathogenic microorganisms passing by. They are exposed to a lethal dose of UVC light that attacks the DNA, thus eliminating the ability of the microorganism to reproduce. Thanks to this process, it cannot replicate itself or infect other organisms with which it comes into contact. This process of exposing water to UV light is simple and effective, killing 99.99% of harmful microorganisms without adding chemicals to the water. In addition, this process is safe and does not create any harmful chemical by-products.

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