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Molecular transformation of dissolved organic matter and the formation of disinfection byproducts in full-scale surface water treatment processes.
Sci Total Environ. 2022 Sep 10; 838(Pt 4):156547.ST

Abstract

Dissolved organic matters (DOM) have important effects on the performance of surface water treatment processes and may convert into disinfection by-products (DBPs) during disinfection. In this work, the transformation of DOM and the chlorinated DBPs (Cl-DBPs) formation in two different full-scale surface water treatment processes (process 1: prechlorination-coagulation-precipitation-filtration; process 2: coagulation-precipitation-post-disinfection-filtration) were comparatively investigated at molecular scale. The results showed that coagulation preferentially removed unsaturated (H/C < 1.0 and DBE > 17) and oxidized (O/C > 0.5) compounds containing more carboxyl groups. Therefore, prechlorination produced more Cl-DBPs with H/C < 1.0 and O/C > 0.5 than post-disinfection. However, the algal in the influent produced many reduced molecules (O/C < 0.5) without prechlorination, and these compounds were more reactive with disinfectants. Sand filtration was ineffective in DOM removal, while microorganisms in the filter produced high molecular weight (MW) substances that were involved in the Cl-DBPs formation, causing the generation of higher MW Cl-DBPs under post-disinfection. Furthermore, the CHO molecules with high O atom number and the CHON molecules containing one N atom were the main Cl-DBPs precursors in both surface water treatment processes. In consideration of the putative Cl-DBPs precursors and their reaction pathways, the precursors with higher unsaturation degree and aromaticity were prone to produce Cl-DBPs through addition reactions, while that with higher saturation degree tended to form Cl-DBPs through substitution reactions. These findings are useful to optimize the treatment processes to ensure the safety of water quality.

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Authors+Show Affiliations

He H
Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan 430074, Hubei, China.
Xu H
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, Zhejiang, China.
Li L
Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan 430074, Hubei, China.
Yang X
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, Zhejiang, China.
Fu Q
Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan 430074, Hubei, China.
Yang X
Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, Zhejiang, China.
Zhang W
Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan 430074, Hubei, China. Electronic address: zhangweijun@cug.edu.cn.
Wang D
Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, Zhejiang, China; Department of Environmental Engineering, Zhejiang university, Hangzhou 310058, Zhejiang, China.

MeSH

DisinfectantsDisinfectionDissolved Organic MatterHalogenationWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

35688238

Citation

He, Hang, et al. "Molecular Transformation of Dissolved Organic Matter and the Formation of Disinfection Byproducts in Full-scale Surface Water Treatment Processes." The Science of the Total Environment, vol. 838, no. Pt 4, 2022, p. 156547.
He H, Xu H, Li L, et al. Molecular transformation of dissolved organic matter and the formation of disinfection byproducts in full-scale surface water treatment processes. Sci Total Environ. 2022;838(Pt 4):156547.
He, H., Xu, H., Li, L., Yang, X., Fu, Q., Yang, X., Zhang, W., & Wang, D. (2022). Molecular transformation of dissolved organic matter and the formation of disinfection byproducts in full-scale surface water treatment processes. The Science of the Total Environment, 838(Pt 4), 156547. https://doi.org/10.1016/j.scitotenv.2022.156547
He H, et al. Molecular Transformation of Dissolved Organic Matter and the Formation of Disinfection Byproducts in Full-scale Surface Water Treatment Processes. Sci Total Environ. 2022 Sep 10;838(Pt 4):156547. PubMed PMID: 35688238.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Molecular transformation of dissolved organic matter and the formation of disinfection byproducts in full-scale surface water treatment processes. AU - He,Hang, AU - Xu,Hui, AU - Li,Lanfeng, AU - Yang,Xiaofang, AU - Fu,Qinglong, AU - Yang,Xiaoyin, AU - Zhang,Weijun, AU - Wang,Dongsheng, Y1 - 2022/06/07/ PY - 2022/04/04/received PY - 2022/05/26/revised PY - 2022/06/04/accepted PY - 2022/6/11/pubmed PY - 2022/6/29/medline PY - 2022/6/10/entrez KW - Disinfection by-products KW - Dissolved organic matter KW - FT-ICR MS KW - Prechlorination KW - Surface water treatment plant SP - 156547 EP - 156547 JF - The Science of the total environment JO - Sci Total Environ VL - 838 IS - Pt 4 N2 - Dissolved organic matters (DOM) have important effects on the performance of surface water treatment processes and may convert into disinfection by-products (DBPs) during disinfection. In this work, the transformation of DOM and the chlorinated DBPs (Cl-DBPs) formation in two different full-scale surface water treatment processes (process 1: prechlorination-coagulation-precipitation-filtration; process 2: coagulation-precipitation-post-disinfection-filtration) were comparatively investigated at molecular scale. The results showed that coagulation preferentially removed unsaturated (H/C < 1.0 and DBE > 17) and oxidized (O/C > 0.5) compounds containing more carboxyl groups. Therefore, prechlorination produced more Cl-DBPs with H/C < 1.0 and O/C > 0.5 than post-disinfection. However, the algal in the influent produced many reduced molecules (O/C < 0.5) without prechlorination, and these compounds were more reactive with disinfectants. Sand filtration was ineffective in DOM removal, while microorganisms in the filter produced high molecular weight (MW) substances that were involved in the Cl-DBPs formation, causing the generation of higher MW Cl-DBPs under post-disinfection. Furthermore, the CHO molecules with high O atom number and the CHON molecules containing one N atom were the main Cl-DBPs precursors in both surface water treatment processes. In consideration of the putative Cl-DBPs precursors and their reaction pathways, the precursors with higher unsaturation degree and aromaticity were prone to produce Cl-DBPs through addition reactions, while that with higher saturation degree tended to form Cl-DBPs through substitution reactions. These findings are useful to optimize the treatment processes to ensure the safety of water quality. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/35688238/Molecular_transformation_of_dissolved_organic_matter_and_the_formation_of_disinfection_byproducts_in_full_scale_surface_water_treatment_processes_ DB - PRIME DP - Unbound Medicine ER -