Performance and simulation of ozone absorption and reactions in a stirred-tank reactor

This research investigates the mass transport of gaseous ozone accompanied by decomposition and ozonation reactions in the liquid phase. Absorption ex periments were carried out under semibatch mode by continued injection of g aseous ozone into an agitated vessel containing an aqueous solution of 2,4- or 2,6-dichlorophenol at 25 degreesC. Under the influence of a fast reacti on between the dissolved ozone and dichlorophenol, the mass transfer rate o f ozone is enhanced greatly resulting in rapid destruction of the dichlorop henol. Simulations of the experimental results suggest that the complete mi xing model can be applied to describe the fluid flow patterns in both the g as and liquid phases. The results of this study indicate that dichloropheno ls can be removed effectively from aqueous solutions of pH near neutrality and that there is little additional advantage in carrying out the treatment process in alkaline solutions.