SOLUBILITY OF OZONE INTO WATER IN A BUBBLE-COLUMN

Ozone absorption in water was investigated by blowing air containing ozone into a bubble column, where pH and water temperature were adjusted in advance. Dissolved ozone concentration in water reached a steady-state value in a short time. Dissolved ozone concentration at steady state was found to be a function of pH, ozone concentration in the air and temperature regardless of superficial gas velocity under the conditions investigated. The concentration increased with decreasing pH and temperature and with increasing ozone concentration in the air. The autodecomposition of ozone in water was satisfactorily represented by 1.5 th-order kinetics with respect to ozone. Empirical equations are proposed for the specific rate constant and Henry's constant, using the correlation of volumetric mass transfer coefficient in bubble columns by Akita et al. A mass balance equation for ozone absorption in water is solved by means of the Runge-Kutta-Gill method using the results mentioned above. As a result, the time course of dissolved ozone concentration can be well estimated.