Title: Effects of Adding UV and H<sub>2</sub>O<sub>2</sub>on the Degradation of Pharmaceuticals and Personal Care Products during O<sub>3</sub>Treatment
Abstract: The degradation of 30 pharmaceuticals and personal care products (PPCPs) subjected to O 3 , O 3 /UV, and O 3 /H 2 O 2 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 O 3 treatment significantly improved the degradation rate of most of the PPCPs.At the same O 3 feed rate, O 3 /UV treatment exhibited much higher PPCP degradation efficiency than that of O 3 treatment.This was probably due to degradation of the PPCPs by O 3 , direct UV photodegradation, and OH radicals that formed from the photodegradation of O 3 during O 3 /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 O 3 treatment, OH radicals were likely to be scavenged by excess H 2 O 2 , 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.