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Photolysis of Chlorine Dioxide under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity under Scenarios Relevant to Potable Reuse and Drinking Water.
Environ Sci Technol. 2022 02 15; 56(4):2593-2604.ES

Abstract

Conversion of potable reuse water utilities and drinking water utilities from a low-pressure UV/H2O2 (LPUV/H2O2) advanced oxidation process (AOP) to alternative AOPs in which oxidants can effectively absorb photons and rapidly generate radicals has attracted great interest. Herein, we propose a novel UVA/ClO2 AOP for different water treatment scenarios because of reduced photon absorption by the background matrix and high molar absorptivity for ClO2 at UVA wavelengths. While the photolysis of ClO2 produces •Cl + O2 or •ClO + O(3P) via distinct product channels, we determined the parameters needed to accurately model the loss of oxidants and the formation of byproducts and combined a kinetic model with experimental data to determine quantum yields (Φ). Modeling incorporating the optimized Φ simultaneously predicted oxidant loss and the formation of major products -HOCl, Cl-, and ClO3-. We also systematically investigated the removal of three contaminants exhibiting different radical reactivities, the formation of 35 regulated and unregulated halogenated disinfection byproducts (DBPs), DBP-associated toxicity, and N-acetylcysteine thiol reactivity in synthetic or authentic RO permeates/surface waters treated by different AOPs. The kinetic model developed in this study was used to optimize operating conditions to control undesired products and improve contaminant removal efficiency. The results indicate that UVA/ClO2 can outperform LPUV/H2O2 in terms of electrical energy per order of contaminant degradation, disinfection byproduct formation, and toxicity indices.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Chuang YH
Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu City 30010, Taiwan.
Wu KL
Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu City 30010, Taiwan.
Lin WC
Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu City 30010, Taiwan.
Shi HJ
Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Rd., Hsinchu City 30010, Taiwan.

MeSH

ChlorineChlorine CompoundsDisinfectionDrinking WaterHydrogen PeroxideOxidantsOxidation-ReductionOxidesPhotolysisUltraviolet RaysWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

35025487

Citation

Chuang, Yi-Hsueh, et al. "Photolysis of Chlorine Dioxide Under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity Under Scenarios Relevant to Potable Reuse and Drinking Water." Environmental Science & Technology, vol. 56, no. 4, 2022, pp. 2593-2604.
Chuang YH, Wu KL, Lin WC, et al. Photolysis of Chlorine Dioxide under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity under Scenarios Relevant to Potable Reuse and Drinking Water. Environ Sci Technol. 2022;56(4):2593-2604.
Chuang, Y. H., Wu, K. L., Lin, W. C., & Shi, H. J. (2022). Photolysis of Chlorine Dioxide under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity under Scenarios Relevant to Potable Reuse and Drinking Water. Environmental Science & Technology, 56(4), 2593-2604. https://doi.org/10.1021/acs.est.1c05707
Chuang YH, et al. Photolysis of Chlorine Dioxide Under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity Under Scenarios Relevant to Potable Reuse and Drinking Water. Environ Sci Technol. 2022 02 15;56(4):2593-2604. PubMed PMID: 35025487.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photolysis of Chlorine Dioxide under UVA Irradiation: Radical Formation, Application in Treating Micropollutants, Formation of Disinfection Byproducts, and Toxicity under Scenarios Relevant to Potable Reuse and Drinking Water. AU - Chuang,Yi-Hsueh, AU - Wu,Kai-Lin, AU - Lin,Wei-Chun, AU - Shi,Hong-Jia, Y1 - 2022/01/13/ PY - 2022/1/14/pubmed PY - 2022/4/13/medline PY - 2022/1/13/entrez KW - advanced oxidation process KW - chlorine dioxide KW - potable reuse KW - thiol reactivity assay KW - ultraviolet A SP - 2593 EP - 2604 JF - Environmental science & technology JO - Environ Sci Technol VL - 56 IS - 4 N2 - Conversion of potable reuse water utilities and drinking water utilities from a low-pressure UV/H2O2 (LPUV/H2O2) advanced oxidation process (AOP) to alternative AOPs in which oxidants can effectively absorb photons and rapidly generate radicals has attracted great interest. Herein, we propose a novel UVA/ClO2 AOP for different water treatment scenarios because of reduced photon absorption by the background matrix and high molar absorptivity for ClO2 at UVA wavelengths. While the photolysis of ClO2 produces •Cl + O2 or •ClO + O(3P) via distinct product channels, we determined the parameters needed to accurately model the loss of oxidants and the formation of byproducts and combined a kinetic model with experimental data to determine quantum yields (Φ). Modeling incorporating the optimized Φ simultaneously predicted oxidant loss and the formation of major products -HOCl, Cl-, and ClO3-. We also systematically investigated the removal of three contaminants exhibiting different radical reactivities, the formation of 35 regulated and unregulated halogenated disinfection byproducts (DBPs), DBP-associated toxicity, and N-acetylcysteine thiol reactivity in synthetic or authentic RO permeates/surface waters treated by different AOPs. The kinetic model developed in this study was used to optimize operating conditions to control undesired products and improve contaminant removal efficiency. The results indicate that UVA/ClO2 can outperform LPUV/H2O2 in terms of electrical energy per order of contaminant degradation, disinfection byproduct formation, and toxicity indices. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/35025487/Photolysis_of_Chlorine_Dioxide_under_UVA_Irradiation:_Radical_Formation_Application_in_Treating_Micropollutants_Formation_of_Disinfection_Byproducts_and_Toxicity_under_Scenarios_Relevant_to_Potable_Reuse_and_Drinking_Water_ DB - PRIME DP - Unbound Medicine ER -