How UV light kills bacteria in water

Ultraviolet (UV) disinfection is an extremely effective way of killing bacteria in water, due to no known bacteria or viruses being resilient to UV light. Reducing the number of pathogens in water is a critical step towards biosecurity, which makes UV disinfection play an important role in our society.

Using UV light disinfection, the cell walls of bacteria, virus, and protozoa are penetrated, permanently altering the DNA of the microorganisms. This effectively inactivates the microorganisms, making them unable to infect and reproduce.

UV has become the preferred water disinfection solution due to its many advantages, such as:

  • Low maintenance and administration costs
  • No dangerous chemicals involved
  • No by-products being added in the process
  • No change of the water properties such as pH and temperature
  • Safe and simple implementation

The video below shows how bacteria in water is effectively killed by UV light.

In order to achieve maximum efficiency in the specific water treatment application, aspects such as the radiation dose and UV Transmission must be considered. The systems of ULTRAAQUA UV takes these aspects into account, which are specifically developed to ensure energy efficiency and high flow capacity.

If you are interested in hearing how our UV systems can assist your water treatment setup, please contact our sales team at