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Identification of important precursors and theoretical toxicity evaluation of byproducts driving cytotoxicity and genotoxicity in chlorination

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Abstract

Chlorination, the most widely used disinfection process for water treatment, is unfortunately always accompanied with the formation of hazardous disinfection byproducts (DBPs). Various organic matter species, like natural organic matter (NOM) and amino acids, can serve as precursors of DBPs during chlorination but it is not clear what types of organic matter have higher potential risks. Although regulation of DBPs such as trihalomethanes has received much attention, further investigation of the DBPs driving toxicity is required. This study aimed to identify the important precursors of chlorination by measuring DBP formation from NOM and amino acids, and to determine the main DBPs driving toxicity using a theoretical toxicity evaluation of contributions to the cytotoxicity index (CTI) and genotoxicity index (GTI). The results showed that NOM mainly formed carbonaceous DBPs (C-DBPs), such as trichloromethane, while amino acids mainly formed nitrogenous DBPs (N-DBPs), such as dichloroacetonitrile (DCAN). Among the DBPs, DCAN had the largest contribution to the toxicity index and might be the main driver of toxicity. Among the precursors, aspartic acid and asparagine gave the highest DCAN concentration (200 g/L) and the highest CTI and GTI. Therefore, aspartic acid and asparagine are important precursors for toxicity and their concentrations should be reduced as much as possible before chlorination to minimize the formation of DBPs. During chlorination of NOM, tryptophan, and asparagine solutions with different chlorine doses and reaction times, changes in the CTI and GTI were consistent with changes in the DCAN concentration.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51678332 and 51738005), the Shenzhen Science, Technology and Innovation Commission (Grant No. JCYJ20170818091859147), the special support program for high-level personnel recruitment in Guangdong Province (Grant No. 2016TQ03Z384), and the Development and Reform Commission of Shenzhen Municipality.

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Authors and Affiliations

  1. Key Laboratory of Microorganism Application and Risk Control of Shenzhen, Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, China

    Qian-Yuan Wu, Yi-Jun Yan & Zi-Fan Liang

  2. Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen, 518055, China

    Yao Lu, Ye Du & Hong-Ying Hu

  3. Environmental Simulation and Pollution Control State Key Joint Laboratory, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), School of Environment, Tsinghua University, Beijing, 100084, China

    Hong-Ying Hu

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  1. Qian-Yuan Wu
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  2. Yi-Jun Yan
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  3. Yao Lu
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  4. Ye Du
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  5. Zi-Fan Liang
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Correspondence to Ye Du.

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Highlights

• NOM formed more C-DBPs while amino acids formed more N-DBPs during chlorination

• Aspartic acid and asparagine showed the highest toxicity index during chlorination

• Dichloroacetonitrile might be a driving DBP for cytotoxicity and genotoxicity

• Dichloroacetonitrile dominated the toxicity under different chlorination conditions

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Wu, QY., Yan, YJ., Lu, Y. et al. Identification of important precursors and theoretical toxicity evaluation of byproducts driving cytotoxicity and genotoxicity in chlorination. Front. Environ. Sci. Eng. 14, 25 (2020). https://doi.org/10.1007/s11783-019-1204-6

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  • DOI: https://doi.org/10.1007/s11783-019-1204-6

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