A developed pressurized pilot scale ozonation system with the volume of 28 L was designed to simulate the field operating condition by transferring premixed ozone and tap water into this system under the influence of three system pressure (1, 2 and 3 kgf/cm2), seven initial pH (5, 6, 6.5, 6.8, 8, 8.5, 9). The system was running in a continuous mode and with only initial pH adjustment to study the dissolution, self-decomposition and mass transfer of ozone in these conditions. The effects of the operating pressure and pH on ozone dissolution concentration, ozone decomposition rates and the liquid phase overall mass transfer coefficients (KLa) were determined quantitatively. The data show the calculated average ozone decomposition rates for pH increase from 5 to 9 are 9.01E-7 to 2.64 E-6 mol/L-min by using mole balance equation at the system pressure 2 kgf/cm2. The calculated average of KLa at the pseudo-steady state are 0.039 min−1 and 0.069 min−1 for pH less 6.5 and greater than 6.8, respectively.

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