Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, Shiga 520-0811, Japan.
Chemosphere. 2009 Oct;77(4):518-25. doi: 10.1016/j.chemosphere.2009.07.041. Epub 2009 Aug 26.
Photodegradation characteristics of pharmaceuticals and personal care products (PPCPs) and the effectiveness of H(2)O(2) addition for PPCPs photodegradation during UV treatment were examined in this study. Average k (1st order rate constant) value for all the PPCPs investigated increased by a factor of 1.3 by H(2)O(2) addition during UV treatment using biologically treated water (TW) spiked with the 30 PPCPs. Therefore, the effectiveness of H(2)O(2) addition for PPCPs removal during UV treatment in real wastewater treatment process was expected. It could be also known that H(2)O(2) addition would improve photodegradation rates of PPCPs highly resistant for UV treatment such as DEET, ethenzamide and theophylline. UV dose required for 90% degradation of each PPCP was calculated from k values obtained in UV and UV/H(2)O(2) treatment experiments using TW spiked with 30 PPCPs. For UV treatment, UV dose required for degrading each PPCP by 90% of initial concentration ranged from 38 mJ cm(-2) to 5644 mJ cm(-2), indicating that most of PPCPs will not be removed sufficiently in UV disinfection process in wastewater treatment plant. For UV/H(2)O(2) treatment, all the PPCPs except seven PPCPs including cyclophosphamide and 2-QCA were degraded by more than 90% by UV irradiation for 30 min (UV dose: 691 mJ cm(-2)), indicating that H(2)O(2) addition during UV treatment will be highly effective for improving the degradation of PPCPs by UV, even though much higher UV dose is still necessary comparing to for UV disinfection.
本研究考察了药品和个人护理用品（PPCPs）的光降解特性以及在紫外线处理过程中添加 H2O2 对 PPCPs 光降解的效果。用添加了 30 种 PPCPs 的经生物处理水（TW）进行紫外线处理时，所有研究的 PPCPs 的平均 k（一级反应速率常数）值通过添加 H2O2 提高了 1.3 倍。因此，预计在实际废水处理过程中添加 H2O2 会提高 UV 处理过程中 PPCPs 的去除效率。还可以知道，H2O2 的添加会提高 DEET、乙酰胺和茶碱等对 UV 处理具有高抗性的 PPCPs 的光降解速率。用添加了 30 种 PPCPs 的 TW 通过 UV 和 UV/H2O2 处理实验获得的 k 值计算了每种 PPCP 降解 90%所需的紫外线剂量。对于 UV 处理，每种 PPCP 降解 90%初始浓度所需的紫外线剂量范围为 38 mJ cm(-2)至 5644 mJ cm(-2)，表明大多数 PPCPs 在废水处理厂的紫外线消毒过程中不会被充分去除。对于 UV/H2O2 处理，除环磷酰胺和 2-QCA 外的 7 种 PPCP 以及所有其他 PPCP 均在 30 分钟（紫外线剂量：691 mJ cm(-2))的紫外线照射下降解超过 90%，表明在紫外线处理过程中添加 H2O2 将极大地提高紫外线对 PPCPs 的降解效果，即使与紫外线消毒相比，仍需要更高的紫外线剂量。
