A transient back flow cell model was used to model the hydrodynamic behaviour of an impinging-jet ozone bubble column. A steady-state back flow cell model was developed to analyze the dissolved ozone concentration profiles measured in the bubble column. The column-average overall mass transfer coefficient, kLa (s-1), was found to be dependent on the superficial gas and liquid velocities, uG (m.s-1) and uL (m.s-1), respectively, as follows: kLa = 55.58·uG1.26·uL0.08. The specific interfacial area, a (m-1), was determined as a = 3.61 × 103·uG0.902·uL -0.038 by measuring the gas hold-up (εG = 4.67·uG1.11·uL -0.05) and Sauter mean diameter, dS (mm), of the bubbles (dS = 7.78·uG0.207·uL - 0.008). The local mass transfer coefficient, kL (m.s-1), was then determined to be: kL = 15.40·uG0.354·uL0.118.
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