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The decolouration effect of ozone on the reactive dye Reactive Red 198 in a CSTR was the subject of a series of experiments. The results showed that ozonation is capable of reducing the colour remaining in the water after using reactive dyes rapidly and effectively of around 15 minutes. The effect of the frit was analysed to check that it was not a factor limiting oxidation. The effect of flow rate and of the initial concentration of dye on the dye concentration as a function of time and at steady state were measured, and the rate of decolouration was calculated under both steady and unsteady state conditions. The flow rate was adjusted for various initial dye concentrations as well as at various flow rates of dye solutions. The apparent first order rate constant is about 0.10 min -1 . Though first-order kinetics in dye concentration fitted the individual sets of results, the rate constants were significantly different from those expected, suggesting that any model that aims to predict the results in general would need to be more complex, and probably include modelling the effective ozone concentration.

Ozonation of Textile Reactive Red 198 Dye in a CSTR