CFD in Drinking Water Treatment

Abstract

An upgraded model was developed by employing a combination of Eulerian-Eulerian two-phase approach and user defined function (UDF) to solve the water-ozone flow and interaction in an ozone contactor using computational fluid dynamics (CFD). Moreover, geometric configuration of the contactor was optimized to improve the performance of the contactor. As indicators Residence Time Distribution (RTD) and Dissolved Ozone Concentration (C) were used for single phase and two-phase CFD models. Validation of experimental data already available in the literature was done for RTD and then its impact on C was studied using different contactor configurations. From simulations it was evident that optimizing structural configurations can greatly reduce the size of recirculation zones, dead zones and short-circuiting. As a result, an increase of 71.6% was observed in dissolved ozone concentration in the geometry containing double-sided horizontal baffles.