What is UV Disinfection?

Ultraviolet (UV) disinfection of wastewater is a completely chemical-free process and uses the natural process of ultraviolet (UVGI). This process uses short-wavelength ultraviolet (UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disturbing their DNA, leaving them unable to perform critical cellular functions.

The Earth's ozone layer blocks natural UV-C light, therefore,  by the time it reaches the earth’s surface it has been severely weakened. However, UVGI devices are capable of producing strong enough UV-C light in circulating water or air systems to make them uninhabitable for microorganisms such as bacteria, viruses, molds and other pathogens.

While UV sterilisation has principally been used in medical sanitation it is becoming increasingly common for the treatment and sterilisation of drinking and wastewater.

UV Wastewater Treatment

Many municipal wastewater utilities have taken up UV disinfection above chemical chlorine disinfection as an environmentally friendly and cost-effective alternative.

UV water disinfection is a simple, safe and highly effective wastewater treatment solution. The microorganisms in effluent are neutralised directly as they pass UV lamps submerged in the water. Only light is added to the water and nothing else, therefore, the chemical composition of the water is not impacted, nor is there dissolved oxygen content in the water.

As UV water disinfection is a chemical-free method of wastewater treatment it is extremely safe. It removes the need to store, transport and handle toxic or corrosive chemicals and doesn’t require any special staff training, certification or emergency response plans and can not be overdosed like some chemical alternatives.

Industrial Applications

UV water treatment is suited to a number of industrial applications including:

  • Cooling tower water
  • Electronics manufacturing facilities
  • Food and beverage facilities
  • Pharmaceutical facilities
  • Cosmetics facilities
  • Spas and swimming pools

However, wastewater that is to be treated using UV germicidal irradiation must be tested to make sure that there are no present interferences such as suspended solids, dyes or other substances that may hinder or absorb the UV radiation. Once these obstacles have been removed, UV disinfection can be used.


UV water treatment is a cost-effective, reliable, safe and highly effective method of water disinfection. It is suitable for a range of applications and provides an environmentally friendly alternative to chemical wastewater treatment methods.

Belmar Technologies is the exclusive UK distributor for the full range of UV Water Disinfection products designed and manufactured in Germany by Enviolet GmbH. For more information, or to discuss how a UV water treatment system can meet your specific requirements, please feel free to get in touch.