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Disinfection: UV




Ultraviolet (UV) Disinfection


Ultraviolet (UV) disinfection is environmentally safe and recognized as effective for a wide range of pathogens, including viruses. For more than 20 years, the AQUARAY® UV disinfection systems have offered proven disinfection alternatives to protect the environment from toxic byproducts formed when hazardous chemicals, like chlorine, combine with organic compounds in receiving waters.

UV systems disinfect by inactivating pathogenic microorganisms such as viruses, bacteria and parasites which may be in the water and may cause waterborne disease.

In the broad light Spectrum, the UV-C wavelength (200-280 nm) has been proven to be the most efficient wavelength to inactivate microorganisms by damaging the nucleic acids (DNA or RNA), which in turns the organism’s ability to reproduce.

The germicidal effectiveness of a UV system is dependant on various water properties such as UV transmission, flow rate and the applied UV dose, which is a function of the UV intensity delivered by the lamps and the exposure time in the reactor.

Degrémont Technologies-Ozonia has developed UV products for three different markets: Municipal Wastewater, Municipal Drinking Water, and Industry.

Municipal Wastewater

In order to protect the natural environment (like rivers, lakes, seas …) more and more strict regulations are implemented to limit the pathogenic microorganisms rejection. On the arid area, due to water scarcity, a part of the treated wastewater can also be used for a reuse application such as land sprinkling, golf irrigation… And over the past 20 years, Degrémont Technologies is providing UV disinfection system for:

  • Secondary or tertiary treatment disinfection
  • CSO & SSO applications
  • Reuse for irrigation

Municipal Drinking Water

UV systems are used as a final barrier in the drinking water treatment plant to disinfect the water by inactivating* the pathogenic microorganisms like viruses, bacteria and parasites. The UV-C lights are particularly efficient for the chlorine resistant microorganisms, even with low dose. So to reduce the risk to be affected by a waterborne diseases, more and more countries are implementing strict limits on these pathogens through new regulations.

Degrémont Technologies-Ozonia can always offer the better compromise between the higher efficiency and the smaller footprint with Low or Medium pressure UV reactors for smaller to very large Water Treatment Plant. (*to inactive: Stop growth and reproduction of microorganisms)


Degrémont Technologies-Ozonia can offer open channels or closed vessels UV reactors for Industrial applications for:

  • Food and beverage
  • Aquaculture
  • Electronics
  • Cooling tower water
  • Pharmaceutical
  • Spas and Swimming pools
  • Cosmetics


Product Video Files


Product Focus

  • UV is chemical free and produces no measurable change in disinfection by-products (DBPs) formed.
  • UV can easily inactivate, even with low UV Dose, chlorine resistant microorganisms.
  • UV can be part of the Multi-Barrier protection strategy in addition with others disinfection methods (like Ozone systems).
  • UV can be easily retrofitted into an existing treatment plant thanks to his compact size.

How Does It Work?

UV-C light is created by a lamp filled with an inert gas and mercury. Electrical energy is applied to electrodes within this lamp which creates an electrical arc through the metallic vapor to generate UV radiation. Two main UV lamp technologies are available for water disinfection. Low pressure lamps have the ability to create a monochromatic radiation at 254 nm, close to the germicidal peak (264 nm). Medium pressure lamps create a broad spectrum of UV wavelengths from 200 to 300+ nm. Degrémont Technologies-Ozonia is able to offer both these powerful technologies.