Effects of Adding UV and H₂O₂ on the Degradation of Pharmaceuticals and Personal Care Products during O₃ Treatment

다국어 초록 (Multilingual Abstract)

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 H₂O₂ during O₃ treatment significantly improved the degradation rate of most of the PPCPs. At the same O₃ feed rate, O₃/UV treatment exhibited much higher PPCP degradation efficiency than that of O₃ 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 O₃ was also promoted by adding H₂O₂ during the O₃ treatment. However, when the initial H₂O₂ 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 H₂O₂ dosage during O₃ treatment to improve PPCP degradation when adding H₂O₂ during O₃ treatment.