CEBEDEAU • Biodosimetry to test UV disinfection lamps

Case study

Biodosimetry to test UV disinfection lamps

The problem

Ultraviolet water treatment systems are increasingly used for drinking water production in Europe. Direct measurement of the performance of UV disinfection systems is not trivial, as the UV dose received by the water to be treated depends on many factors such as lamp power, reactor geometry or the composition of the water to be treated.

The project

Our partner for this project, Airwatec, specialises in industrial engineering in the fields of air and water filtration and purification. The company manufactures and markets, among other things, UV filters for domestic and industrial use.

In order to guarantee the quality of its products and to study the impact of the adaptations of its UV reactors, CEBEDEAU has developed a device for the latter which allows performance tests to be carried out by biodosimetry. These tests consist of measuring the quantity of pathogens inactivated during their passage through the reactor to be tested. Using a reference curve expressing the germicidal effect as a function of the UV dose received, it is possible to determine the effective dose delivered by the system and therefore the performance of the reactor tested.

This performance is expressed in relation to the maximum flow rate allowed to have a fluence (UV dose) high enough to consider the water as potable (a dose of 400 J/m² is generally necessary for certification as potable).

The result

The biodosimetry test developed serves to objectify and guarantee the effectiveness of the equipment, whatever the field of application (disinfection, potabilisation, agriculture, etc.). Airwatec now has a system for determining the disinfection performance of its devices (prototypes and commercials) and regularly calls on the services of CEBEDEAU.

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