THE DEVELOPMENT OF AN OZONE CONTACT TANK SIMULATION-MODEL

Anglian Water (AW) operates ozone facilities as a treatment stage at a ll its surface water sources. The main ozone treatment stage takes pla ce after filtration in multi-compartment concrete ozone contactors. Th ese have two stages of ozone gas injection via ceramic bubble diffuser s and two decay stages. To enable AW to gain a better understanding of the contact tank performance, a computer simulation model incorporati ng Computational Fluid Dynamics and ozone process modeling was develop ed in conjunction with AEA Harwell. The model was calibrated using sit e data from Alton WTW. The results were used to improve the tank desig n and to optimize the ozone dose; this resulted in improved performanc e and a significant reduction in ozone dose.