Effects of Adding UV and H 2 O 2 on the Degradation of Pharmaceuticals and Personal Care Products during O 3 Treatment
2011
The degradation of 30 pharmaceuticals and personal care products (PPCPs) subjected to O3, O3/UV, and O3/H2O2 treatments were investigated using semi-batch tests and evaluated by their pseudo-first-order rate constants. The additional application of UV or H 2 O 2 during O3 treatment significantly improved the degradation rate of most of the PPCPs. At the same O 3 feed rate, O3/UV treatment exhibited much higher PPCP degradation efficiency than that of O 3 treatment. This was probably due to degradation of the PPCPs by O3, direct UV photodegradation, and OH radicals that formed from the photodegradation of O3 during O3/UV treatment. PPCP degradation by O 3 was also promoted by adding H 2 O 2 during the O 3 treatment. However, when the initial H 2 O 2 concentration was high during O3 treatment, OH radicals were likely to be scavenged by excess H2O2, leading to low PPCP degradation. Therefore, it is important to determine the appropriate H 2 O 2 dosage during O 3 treatment to improve PPCP degradation when adding H 2 O 2 during O 3 treatment.
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