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F.J. Beltrán,F.J. Rivas 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Kinetics of the ozonation of water contaminants is usually based on mol balance equations applied in thewater bulk. In these models, direct and free radical reactions are considered, neglecting the contributionof reactions developed in the proximity of the gas–water interface. In this work, a theoretical kineticmodel of the ozonation involving direct and free radical reactions in the film and water bulk is carriedout. The model is based on film and penetration absorption theories. Time concentration profiles areassessed by coupling the non-stationary penetration theory with bulk mass balances. Studied variablesare chosen according to their influence on the numbers of Hatta and instantaneous reaction factor. These parameters are equilibrium ozone and compound concentrations, direct rate constant, and masstransfer coefficient. The effect of pH and hydrogen peroxide are studied. Calculated results reveal thatdirect reaction contribution in the film has a significant importance, especially in fast-moderate kineticregimes of ozone absorption. Absence of film free radical reactions leads to compound removal ratesslightly lower than the complete mechanism (fast regimes develop). Formation of hydrogen peroxideand its reaction with ozone leads to the formation of free radicals.