Abstract:Solutions of the dimethyl phthalate (DMP) of pH 3.0 have been treated with ozone and ozonation catalyzed with hydroxylamine sulfate (HAS). The influence of hydroxyl radical (•OH) inhibitor tert-butyl alcohol (TBA) pH on the decomposition of O3 were also investigated. The results indicated that the degradation rate of DMP in O3/HAS system was improved by 82.58% compared with that of ozonation alone. In the presence of TBA

the removal rate of DMP is significantly decreased in O3/HAS system

due to •OH rapidly consumed by TBA. Ozone decomposition is obviously accelerated with the increased of HAS concentration at pHs ranging from 3.0 to 9.2. Besides

hydroxylamine hydrochloride (HAC) and hydroxylamine phosphate (HAP) have been chosen to investigate the effect of hydroxylamine species on ozonation. It is shown that O3/HAS、O3/HAC、O3/HAP processes have promote the elimination of DMP.