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Micropollutant abatement and byproduct formation during the co-exposure of chlorine dioxide (ClO2) and UVC radiation.
J Hazard Mater. 2021 10 05; 419:126424.JH

Abstract

Photolysis of ClO2 by UVC radiation occurs in several drinking water treatment scenarios (e.g., pre-oxidation by ClO2 with post-UVC disinfection or a multi-barrier disinfection system comprising ClO2 and UVC disinfection in sequence). However, whether micropollutants are degraded and undesired byproducts are formed during the co-exposure of ClO2 and UVC radiation remain unclear. This study demonstrated that four micropollutants (trimethoprim, iopromide, caffeine, and ciprofloxacin) were degraded by 14.4-100.0% during the co-exposure of ClO2 and UVC radiation in the synthetic drinking water under the environmentally relevant conditions (UV dose of 207 mJ cm-2, ClO2 dose of 1.35 mg L-1, and pH of 7.0). Trimethoprim and iopromide were predominantly degraded by ClO2 oxidation and direct UVC photolysis, respectively. Caffeine and ciprofloxacin were predominantly degraded by the radicals (HO• and Cl•) and the in-situ formed free chlorine from ClO2 photolysis, respectively. The yields of total organic chlorine (12.5 µg L-1 from 1.0 mg C L-1 of NOM) and chlorate (0.14 mg L-1 From 1.35 mg L-1 of ClO2) during the co-exposure were low. However, the yield of chlorite was high (0.76 mg L-1 from 1.35 mg L-1 of ClO2), which requires attention and control.

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Authors+Show Affiliations

Kong Q
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
Fan M
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
Yin R
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong. Electronic address: ryin@connect.ust.hk.
Zhang X
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
Lei Y
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China.
Shang C
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Yang X
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China. Electronic address: yangx36@mail.sysu.edu.cn.

MeSH

ChlorineChlorine CompoundsDisinfectionDrinking WaterOxidation-ReductionOxidesWater Pollutants, ChemicalWater Purification

Pub Type(s)

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

Language

eng

PubMed ID

34174627

Citation

Kong, Qingqing, et al. "Micropollutant Abatement and Byproduct Formation During the Co-exposure of Chlorine Dioxide (ClO2) and UVC Radiation." Journal of Hazardous Materials, vol. 419, 2021, p. 126424.
Kong Q, Fan M, Yin R, et al. Micropollutant abatement and byproduct formation during the co-exposure of chlorine dioxide (ClO2) and UVC radiation. J Hazard Mater. 2021;419:126424.
Kong, Q., Fan, M., Yin, R., Zhang, X., Lei, Y., Shang, C., & Yang, X. (2021). Micropollutant abatement and byproduct formation during the co-exposure of chlorine dioxide (ClO2) and UVC radiation. Journal of Hazardous Materials, 419, 126424. https://doi.org/10.1016/j.jhazmat.2021.126424
Kong Q, et al. Micropollutant Abatement and Byproduct Formation During the Co-exposure of Chlorine Dioxide (ClO2) and UVC Radiation. J Hazard Mater. 2021 10 5;419:126424. PubMed PMID: 34174627.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Micropollutant abatement and byproduct formation during the co-exposure of chlorine dioxide (ClO2) and UVC radiation. AU - Kong,Qingqing, AU - Fan,Mengge, AU - Yin,Ran, AU - Zhang,Xinran, AU - Lei,Yu, AU - Shang,Chii, AU - Yang,Xin, Y1 - 2021/06/17/ PY - 2021/03/31/received PY - 2021/06/08/revised PY - 2021/06/15/accepted PY - 2021/6/27/pubmed PY - 2021/9/24/medline PY - 2021/6/26/entrez KW - Advanced oxidation process (AOP) KW - Chlorine dioxide (ClO(2)) KW - Disinfection byproducts (DBPs) KW - Micropollutants KW - Ultraviolet (UV) SP - 126424 EP - 126424 JF - Journal of hazardous materials JO - J Hazard Mater VL - 419 N2 - Photolysis of ClO2 by UVC radiation occurs in several drinking water treatment scenarios (e.g., pre-oxidation by ClO2 with post-UVC disinfection or a multi-barrier disinfection system comprising ClO2 and UVC disinfection in sequence). However, whether micropollutants are degraded and undesired byproducts are formed during the co-exposure of ClO2 and UVC radiation remain unclear. This study demonstrated that four micropollutants (trimethoprim, iopromide, caffeine, and ciprofloxacin) were degraded by 14.4-100.0% during the co-exposure of ClO2 and UVC radiation in the synthetic drinking water under the environmentally relevant conditions (UV dose of 207 mJ cm-2, ClO2 dose of 1.35 mg L-1, and pH of 7.0). Trimethoprim and iopromide were predominantly degraded by ClO2 oxidation and direct UVC photolysis, respectively. Caffeine and ciprofloxacin were predominantly degraded by the radicals (HO• and Cl•) and the in-situ formed free chlorine from ClO2 photolysis, respectively. The yields of total organic chlorine (12.5 µg L-1 from 1.0 mg C L-1 of NOM) and chlorate (0.14 mg L-1 From 1.35 mg L-1 of ClO2) during the co-exposure were low. However, the yield of chlorite was high (0.76 mg L-1 from 1.35 mg L-1 of ClO2), which requires attention and control. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/34174627/Micropollutant_abatement_and_byproduct_formation_during_the_co_exposure_of_chlorine_dioxide__ClO2__and_UVC_radiation_ DB - PRIME DP - Unbound Medicine ER -