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C. Reichl, C. Buchner, G. Hirschmann, R. Sommer, A. Cabaj:
"Development of a simulation method to predict UV disinfection reactor performance and comparison to biodosimetric measurements";
Talk: Conference on Modelling Fluid Flow (CMFF'06), Budapest; 09-06-2006 - 09-09-2006; in: "Proceedings of the Conference on Modelling Fluid Flow, Budapest University of Technology and Economics, Hungary 2006", (2006), ISBN: 963-420-872-x; 591 - 598.

Nowadays, water disinfection with ultraviolet (UV) radiation becomes increasingly important. This work presents a simulation method to predict the disinfection efficacy of an UV disinfection reactor and compares the results to biodosimetric measurements.
CFD calculations have been performed for a set of operation parameters. A discrete phase model was used to generate particle tracks. The fluence rate field inside the reactor has been simulated using several radiation models. Particle tracks and radiation models have been combined to calculate the reduction equivalent fluence (REF), an important quantity in biodosimetry. The obtained simulation results are compared to experimental data to assess the achieved accuracy.
The simulated pressure loss of the reactor agreed very well with the experiments. In contrast to the biodosimetric measurements, only a limited amount of data for the flow field and fluence rate distribution is provided by Austrian standard certification procedures. Considering this, good predictions of the REF were obtained by the presented simulation method. Average error values varied between 7 and 25%, depending on the chosen radiation model. The potential use of this method for designing and improving UVD reactors has been demonstrated.

biodosimetry, Computational Fluid Dynamics, particle tracking, radiation models, Reduction Equivalent Fluence, Ultraviolet disinfection

http://publik.tuwien.ac.at/files/pub-mb_5456.pdf