Modeling of an ozone-wastewater system's kinetics

The mass transfer of ozone into aqueous solution is important in both disinfection and reduction of organic matter, i.e. the more ozone transferred into the solution the better the disinfection and the less the amount of organic matter left in the effluent. The mathematical model proposed by Sheffer and Esterson (Wat. Res. 16, 383, 1982) for an ozone-tap water system is modified to predict the amount of ozone input required for a given ozone residual, and COD in an actual ozone-wastewater system. Knowing the amount of ozone needed as input to obtain a specific ozone residual in a given wastewater can prevent wastage of ozone and conserve energy for a required degree of treatment. The values of ozone mass transfer rate k_La (1.243 min^-1), ozone decomposition rate k₁ (0.087 min^-1) and ozone reaction rate k₂ [0.091 (l/mg) ^{1 2} min^-1] obtained by using the proposed model are similar to the values reported in the literature.