The primary purpose of disinfecting water supplies is to inactivate microbial pathogens to prevent the spread of waterborne diseases. Waterborne diseases are typically caused by enteric pathogens which belong to the group of organisms transmitted by the faecal–oral route. These pathogens comprise a diverse group of organisms that serve as the agents of waterborne disease including bacterial, viral and protozoan species.


Ultraviolet light, Ozon, Chlorine, Chloramination, Chlorine dioxide

Ultraviolet light

There is a growing interest in the use of ultraviolet (UV) light to disinfect drinking water as it has been shown to inactivate a wide range of microorganisms including Cryptosporidium without producing any disinfection by-products.

Ultraviolet radiation is an electromagnetic radiation of slightly higher frequency than visible light but rather lower than that of X-rays. The UV spectrum is arbitrarily divided into three bands according to the wavelength of the radiation It is the lowest wavelength (and therefore highest frequency) radiation, in the UVC band, that has the strongest biocidal properties.

UVA 400–315 nm

UVB 315–280 nm

UVC 280–200 nm

Visible 400–700 nm

At the wavelength 254nm, the UV-C penetrate to the DNA heart and eradicate micro-organism (virus, bacteria, algae, yeasts, mould, including Legionella, Cryprosporidium, Giardia and Toxoplasma that are are hardly destroyed by ozone and not at all by chlorine at standard doses), destroying cell metabolism until they are completely destroyed. Thus all germs are deactivated and cannot reproduce.


  • Physical treatment with no change in the physico-chemical quality of the water: the original taste and smell of the water are preserved
  • No disinfection by-products created that are harmful to human health
  • No risk of under or over-dosing
  • No chemical product monitoring and handling constraints
  • May be combined with other treatment processes (filtration, softening etc.)
  • No risk of allergies
  • Corrosion reduction
  • Easy and quick installation, simple maintenance

The effective dose

The UV dose is equivalent to the UV energy that the living micro-organism has to absorb to be inactivated. The table below shows the UV-C dose levels (expressed in millijoules (mJ) /cm2) required to eradicate 99.9% of the micro-organisms.


BIO-UV Group, the ultraviolet water treatment specialist for 20 years, developed a concept for chlorine-free water treatment based on disinfection technology using type C ultraviolet light.

The BIO-UV reactors in the UV HOME and IBP ranges are used to make : raw water coming from local drinkable resources, water in the system safe to drink, particularly after dechlorination using active charcoal and recycled rainwater safe for domestic use only.


  • Compact reactor, easy to install
  • Separate electrical cabinet for free mounting on the wall
  • Inlet/outlet in ≪L≫ with inlet under the reactor and outlet on the top of the reactor
  • Simple and economical technology regarding investment and operating
  • Option : UV intensity sensor
  • Excellent disinfecting performance by optimization of UV emissions and hydraulic flow
  • Use of single-base lamps, patented sealing system and vertical design for an easy maintenance
  • Lamp life optimized: 13 000 hours depending on the number of switchings on