Disinfection/oxidation processes are a major step in the water treatment train. As high levels of inactivation or removal of pathogens and micropolluants are aimed at the design and optimized operating conditions are crucial issues for the reliability of the treatment and cost control. In this context, using computational fluid dynamics allows better evaluation of the efficiency of the treatment and guarantees its performance prior to full-scale design. Examples are given in this paper of the capability of the numerical tool in order to propose an optimized solution for a refurbishment or a new plant design. The full-scale realization confirmed the predicted quality benefit.

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