KINETICS OF THE OZONE OXIDATION OF WEAK ACID BRILLIANT GREEN IN AQUEOUS SOLUTION

An ozone system was used to study the degradation of weak acid brilliant green and the kinetic model of degradation was established in this paper. The effects of oxygen flow rate, temperature, initial concentration of the weak acid brilliant green and pH were investigated through a series of batch tests. To be specific, in this study, the kinetics of ozonation of weak acid brilliant green were investigated under different experimental conditions in an ozone reactor (50-150 mg/L dye, 293-333 K, ozone flux in 16-60 L/h, pH in 1-13 range). A relatively suitable degradation temperature of dye was chosen at 293 K. The degradation rate increased with the increase of pH. It can be observed that with the increase of the initial concentration of weak acid brilliant green, the degradation rate decreased. Enhancing oxygen flow rate also enhanced the removal of dye. The kinetic model of weak acid brilliant green was established and the rate constants and the kinetic system of the reaction between ozone and dye were obtained by fitting the experimental data to a kinetics model based on a first order reaction. The ozonation processes and the impacts of ozone on dying wastewater degradation were clearly identified.