Ozone Transfer into Water in a Gas-Inducing Reactor

In this study, ozone gas mass transfer into water using a new gas-inducing reactor was investigated. The effects of various operation parameters upon the ozone volumetric mass-transfer coefficient ( k L,O 3 a ) were determined, including agitation speed, working liquid level, temperature, and superficial gas velocity in a semibatch system. Experimental results show that the ozone volumetric mass-transfer coefficient increases with increasing agitation speed, temperature, and superficial gas velocity. As the agitation speed increases, the effect on volumetric mass-transfer coefficient ( k L,O 3 a ) decreases at higher agitation speed and superficial gas velocity. For this new gas-inducing reactor, a higher ozone volumetric mass-transfer coefficient can be obtained at lower working liquid level. The k L,O 3 a obtained in this study ranged from 0.6 to 1.2 min -1 and was close to the literature results. In addition, the correlation for the ozone volumetric mass-transfer coefficient at pH 7 was obtained.