The understanding of ozonation in bubble columns is the first step to describe this process for organic and inorganic pollutants in water medium in this equipment. This paper developed mathematical models for decomposition of ozone in liquid phase, with analytical solution for zero, first and second-orders kinetics for different pH values, with and without gaseous phase mass transfer effect in the ozone transfer to the liquid phase. The results models are satisfactory when compared with experimental data, and indicate the importance to consider such effects Ver menos