Design of UV reactors by CFD: Model Development and Experimental Validation

J. Hofman1,2,3, L. Shao2, B. Wols2, W. Uijttewaal2, G. I. J. Pelaar1, E. Beerendonk1, and H. van Dijk2
1Kiwa Water Research, Rijkswijk, The Netherlands
2Delft University of Technology, Delft, The Netherlands
3Waternet, Amsterdam, The Netherlands

UV technology is an emerging technology for drinking-water treatment. It can either be used as a disinfection barrier, where the UV light is used to inactivate pathogenic microorganisms, or in combination with hydrogen peroxide as an advanced oxidation process.

The design of UV reactors is very complex. The water flow and related aspects of mixing, the UV light distribution, and the reaction kinetics all have to be taken into account. Therefore, CFD is a crucial tool in the design process of UV reactors.

This paper describes the development of a multiphysics model that can be used to calculate the flow aspects and fluency rate distribution in the reactor. Monte-Carlo simulations with a Lagrangian particle tracking model is used to calculate the UV dose distribution.