Enhanced degradation of emerging contaminants by Far-UVC photolysis of peracetic acid: Synergistic effect and mechanisms

作者：Chenyan Hu, Li-Li Hu, Zheng-Yu Dong, Xinyu Yang, Hao Liu, Jianan Chen, Ling-Mei Gao · 发表于：Water Research · 年份：2024 · DOI：10.1016/j.watres.2024.121943 · 被引用次数：48 · 研究领域：Advanced oxidation water treatment、Water Quality Monitoring and Analysis、Oil Spill Detection and Mitigation

Krypton chloride (KrCl*) excimer lamps (222 nm) are used as a promising irradiation source to drive ultraviolet-based advanced oxidation processes (UV-AOPs) in water treatment. In this study, the UV 222 /peracetic acid (PAA) process is implemented as a novel UV-AOPs for the degradation of emerging contaminants (ECs) in water. The results demonstrate that UV 222 /PAA process exhibits excellent degradation performance for carbamazepine (CBZ), with a removal rate of 90.8 % within 45 min. Notably, the degradation of CBZ in the UV 222 /PAA process (90.8 %) was significantly higher than that in the UV 254 /PAA process (15.1 %) at the same UV dose. The UV 222 /PAA process exhibits superior electrical energy per order (EE/O) performance while reducing resource consumption associated with the high-energy UV 254 /PAA process. Quenching experiments and electron paramagnetic resonance (EPR) detection confirm that HO• play a dominant role in the reaction. The contributions of direct photolysis, HO•, and other active species (RO• and 1 O 2 ) are estimated to be 5 %, 88 %, and 7 %, respectively. In addition, the effects of Cl − , HCO 3 − , and humic acid (HA) on the degradation of CBZ are evaluated. The presence of relatively low concentrations of Cl − , HCO 3 − , and HA can inhibit CBZ degradation. The UV 222 /PAA oxidation process could also effectively degrade several other ECs (i.e., iohexol, sulfamethoxazole, acetochlor, ibuprofen), indicating the potential application of this process ...