The ozone concentration in liquid phase vs. time during ozone absorption in water and the influence of pH value are studied. On the basis of the film theory a mathematical model is established to predict the ozone concentration in aqueous solution. The theoretical results are in agreement with the absorption data. Meanwhile

the transport phenomenon in ozone absorption is also studied. Analytical solutions are derived to predict enhancement factors in ozone absorption processes accompanied with ozone decomposition and a series of first or second order ozonation reactions. Compared with literature data the predicted results are reasonable.