Iodo-trihalomethanes formation during chlorination and chloramination of iodide-containing waters in the presence of Cu.

08:00 EDT 24th March 2019 | BioPortfolio

Summary of "Iodo-trihalomethanes formation during chlorination and chloramination of iodide-containing waters in the presence of Cu."

In this study, the impact of Cu on the formation of iodo-trihalomethanes (I-THMs) during chlorination and chloramination of iodide-containing waters was investigated. Initially, the oxidant consumption and evolution of hypoiodous acid (HOI) were determined during disinfection in the presence of Cu and the interaction between natural organic matter humic acid (HA) and Cu was also analyzed. Subsequently, the formation of the I-THMs at various Cu concentrations was evaluated for chlorination and chloramination. Moreover, in order to explore the possible underlying mechanisms, five model compounds based on the HA structure were used to investigate the I-THMs formation with and without Cu during disinfection. The results indicated that the presence of Cu markedly affected the conformation of the HA rather than the HOI evolution during disinfection. The concentration of the I-THMs decreased from 34.5 ± 0.8 to 20.9 ± 0.8 nM as the Cu concentration increased from 0 to 20 μM during chlorination. In contrast, during chloramination, the total I-THMs concentration decreased from 320.7 ± 7.4 to 267.2 ± 10.7 nM as the Cu concentration increased from 0 to 5 μM and then increased to 315.0 ± 1.7 nM when the Cu concentration reached 20 μM. The disinfection experiments with the model compounds suggested that the impact of Cu on the I-THMs formation largely depended on the organic structures in the HA, thus leading to different results during chlorination and chloramination.


Journal Details

This article was published in the following journal.

Name: The Science of the total environment
ISSN: 1879-1026
Pages: 101-107


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