Guan Jingmeng, Huang Huang, Chu Wenhai, Yang Xin
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, PR China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Water Res. 2025 Sep 1;283:123866. doi: 10.1016/j.watres.2025.123866. Epub 2025 May 19.
Far-UVC-driven (222 nm) advanced oxidation processes (UV/AOPs) have gained increasing attentions for water decontamination owing to their high yields of reactive species and rapid degradation rate constants of emerging contaminants. However, the formation of toxic disinfection by-products (DBPs) during UV/AOP treatments of saline water remains unexplored. In this study, we demonstrated that DBPs generated in UV/PDS and UV/HO treatment of saline water with the presence of 0.5 M Cl was 3.55-4.50 and 1.47-1.61 times higher, respectively, compared to those generated in UV/PDS and UV/HO. Adsorbable organic halogen (AOX) generated in UV/AOPs was also higher than UV/AOPs. Notably, DBPs and AOX generated from Suwannee River fulvic acid (SRFA) in UV/PDS treatment were 32.33 times and 6.14 times higher than in UV/HO, primarily due to the elevated concentration of reactive halogen species and the accumulation of hypochlorous acid/ hypohalite. Moreover, the presence of Br⁻ in saline water led to the conversion of chlorinated DBPs into brominated DBPs in both UV/PDS and UV/HO, significantly increasing the overall toxicity associated with DBPs. Increasing the pH from 5.0 to 9.0 was found to reduce DBP-associated toxicity. This study highlights the formation of toxic DBPs in UV/AOPs and provides theoretical foundation for the selection and regulation of UV/AOPs from the perspective of DBP control.
远紫外C驱动（222纳米）的高级氧化过程（UV/AOPs）因其产生的活性物种产量高以及对新兴污染物的降解速率常数快，在水净化方面受到越来越多的关注。然而，在UV/AOPs处理盐水过程中有毒消毒副产物（DBPs）的形成仍未得到研究。在本研究中，我们证明，在含有0.5 M Cl的情况下，UV/PDS和UV/HO处理盐水中产生的DBPs分别比UV/PDS和UV/HO处理产生的DBPs高3.55 - 4.50倍和1.47 - 1.61倍。UV/AOPs中产生的可吸附有机卤素（AOX）也高于UV/AOPs。值得注意的是，UV/PDS处理中来自苏万尼河富里酸（SRFA）产生的DBPs和AOX分别比UV/HO处理高32.33倍和6.14倍，这主要是由于活性卤素物种浓度的升高以及次氯酸/次卤酸盐的积累。此外，盐水中Br⁻的存在导致在UV/PDS和UV/HO中氯化DBPs转化为溴化DBPs，显著增加了与DBPs相关的总体毒性。发现将pH从5.0提高到9.0可降低与DBPs相关的毒性。本研究突出了UV/AOPs中有毒DBPs的形成，并从DBP控制的角度为UV/AOPs的选择和调控提供了理论基础。
