If the water in a drinking water resource is contaminated by microorganisms, it has to be disinfected to protect people's health from infections. Over the last few years, the use of ultraviolet radiation, in which the drinking water is fed through an irradiation chamber, has become very important throughout the world. The radiation is absorbed by the genetic material of the microorganisms so that they are no longer able to multiply.
The test method for monitoring the hygiene of UV disinfection plants outlined in Austrian National Standard ÖNORM M 5873 was developed at the Medical University of Vienna and in 2010 it was established at the Wiental Water Technology Centre, founded by the university. UV plants for disinfecting drinking water in France, Germany and England, as well as many other countries, have to be tested in accordance with this Austrian National Standard.