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Modelling Ozonation Processes for Disinfection By-Product Control in Potable Water Treatment: From Laboratory to Industrial Units

Abstract : Facing major challenges, management of ozonation process will increasingly need prediction tools based on modelling. Dealing with different types of waters (chemistry) and different types of tanks (hydraulics), modelling of ozonation units has to adapt to site-specific conditions. The main objective of this work was to develop an integrated modelling procedure for industrial ozonation processes for predicting concentration profiles of: ozone, bromate and specific micropollutants. Two types of chemical models were considered: semi-empirical models with adjustable kinetics (for the role of Natural Organic Matter, NOM) and mechanistic models with predetermined kinetics (for other phenomena related to ozonation). Hydraulic flow conditions were modelled by systematic networks (patterns of ideal reactors). Ozone decomposition, hydroxyl radical generation and bromate formation were studied at lab-scale with a specially developed apparatus. Various experimental conditions were tested: pH, temperature, ozone doses, initial bromide concentrations, concentration of NOM and nature of NOM. The model was able to adequately reproduce experimental measurements for nine of the eleven water samples studied, covering a wide domain: 6.1 ≤ pH ≤ 8.15; 1.02 meq.L-1 ≤ AT ≤ 6.02 meq.L-1; 0-.0.5 mg.L-1 ≤ TOC ≤ 3.1 mg.L-1. For bromate, considering the crucial zone between the quantification limit and 20 μg.L-1, a large majority of the simulated concentrations corresponded to experimental concentrations or were located in the experimental uncertainty interval. A full-scale study showed that models calibrated at lab-scale may be used directly on-site to predict the formation of bromate and ozone profiles. Readjustments of the model for bromate formation should however account for seasonal changes.
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Submitted on : Thursday, February 10, 2011 - 12:46:15 AM
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  • HAL Id : tel-00564767, version 1

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Pierre Mandel. Modelling Ozonation Processes for Disinfection By-Product Control in Potable Water Treatment: From Laboratory to Industrial Units. Engineering Sciences [physics]. Université Rennes 1, 2010. English. ⟨tel-00564767⟩

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