Formation of Iodinated Trihalomethane Disinfection By-products by Co-oxidation of Natural Organic Matter with Sodium Hypochlorite and Lead Dioxide

doi:10.1007/s40242-023-3042-0

Chemical Research in Chinese Universities ›› 2023, Vol. 39 ›› Issue (3): 449-454.doi: 10.1007/s40242-023-3042-0

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Formation of Iodinated Trihalomethane Disinfection By-products by Co-oxidation of Natural Organic Matter with Sodium Hypochlorite and Lead Dioxide

WANG Junyao, HU Xialin, LIU Meichuan, YIN Daqiang

1. Key Labatory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P. R. China;
2. Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai, 200092, P. R. China;
3. School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, Shanghai, 200092, P. R. China

Received:2023-02-25 Published:2023-05-25
Contact: Xialin Hu E-mail:xlhu@tongji.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China(No.22076141) and the Fundamental Research Funds for the Central Universities, China(No.2022-4-YB-13).

Abstract

Abstract: Iodinated trihalomethanes(I-THMs) in drinking water pipelines have attracted wide attention due to their high toxicity. The coexistence of widely present lead dioxide(PbO₂) with commonly used disinfectant sodium hypochlorite(NaClO) in drinking water might change the formation characteristics of I-THMs due to the strongly oxidizing properties of PbO₂. This study investigated the formation of I-THMs during the co-oxidation of natural organic matter including humic acid(HA), extracellular organic matter(EOM), and intracellular organic matter(IOM) of algogenic organic matter by PbO₂ and NaClO. Triiodomethane(CHI₃) is the dominant product in the single oxidation system of PbO₂, whereas trichloromethane (CHCl₃), chlorodiiodomethane(CHClI₂), and dichloroiodomethane (CHCl₂I) are the major products in the single NaClO system. In the co-oxidation system, the dominant I-THMs are similar to those in the single NaClO system. However, the CHCl₃ content decreased to 56.4% whereas I-THMs concentrations remained unchanged with the increase of PbO₂ concentration. The main reason is attributed to the reduced residual chlorine content due to the reaction of PbO₂ with NaClO. IOM is more prone to forming I-THMs than HA and EOM due to the specified structures. This study suggested that PbO₂ in the drinking water supply pipelines might change the risk of THMs.

Key words: Lead dioxide, Iodinated trihalomethane, Humic acid, Algogenic organic matter

WANG Junyao, HU Xialin, LIU Meichuan, YIN Daqiang. Formation of Iodinated Trihalomethane Disinfection By-products by Co-oxidation of Natural Organic Matter with Sodium Hypochlorite and Lead Dioxide[J]. Chemical Research in Chinese Universities, 2023, 39(3): 449-454.

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Formation of Iodinated Trihalomethane Disinfection By-products by Co-oxidation of Natural Organic Matter with Sodium Hypochlorite and Lead Dioxide

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