Ozone was employed for degradation of dimethyl phthalate (DMP) in a simulated wastewater

and the effects of pH

DMP initial concentration

ozone dosage and reaction temperature on DMP degradation and its kinetics were investigated.The experimental results showed that the degradation efficiency of DMP was better in the range of pH 5—10

decreased with increase of DMP initial concentration although degradation total amount of DMP increased gradually

and increased with increase of ozone dosage but ozone utilization efficiency decreased.The reaction temperature had no remarkable effect on the degradation efficiency over 24℃

although below this temperature it increased with rise of temperature. The degradation efficiency could reach up to 85% at the conditions of pH 5—10

DMP concentration 14—66 mg·L-1

ozone dosage 14—24 mg·min-1

temperature 20—30℃ and time 40 min.The degradation of DMP by ozonation followed pseudo-first-order kinetics under the experimental conditions

and its kinetic model was determined.There was no correlation between kobs and pH in the range of pH 2—12

because of different reaction mechanism of ozonation degradation.The kobs increased quickly in pH 2—5 and slightly in pH 5—9

but the decrease of kobs was observed over pH 9

and the biggest kobs was 0.0929 min-1.