Comparison of THMs Formation between Chlorination and Chloramination of Simulated Water with TiO2 and UV Pretreatment

Jing Meng; Zhi Liang Zhu; Yan Ling Qiu

doi:10.4028/www.scientific.net/AMM.665.451

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 665Comparison of THMs Formation between Chlorination...

Comparison of THMs Formation between Chlorination and Chloramination of Simulated Water with TiO₂ and UV Pretreatment

Abstract:

In this study, the formation of trihalomethanes (THMs) during chlorination or chloramination after different pretreatments including single nanoTiO₂ adsorption, single UV treatment or the combination of UV/TiO₂ under the same pH, TiO₂ dose and humic acid concentrations were evaluated. Effect of different pretreatments on the reduction of non-purgeable organic carbon (NPOC) and UV₂₅₄ before the disinfection was investigated. The result showed that single UV and single TiO₂adsorption to reduce NPOC and UV₂₅₄ values is negligible, and the combination of UV/TiO₂ removed 45% of NPOC and 72% of UV₂₅₄ after 480min reaction. For the formation of the THMs during the followed chlorination, it was found that the combination pretreatment of UV/TiO₂ resulted in a parabolic trend for the formation of the THMs while single UV pretreatment increased steadily and single TiO₂ pretreatment kept stable. Chlorination generated higher concentrations of total THMs than chloramination. The total THMs produced by chloramination only represented <5% of that of chlorination.

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Periodical:

Applied Mechanics and Materials (Volume 665)

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451-454

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.665.451

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Online since:

October 2014

Authors:

Jing Meng, Zhi Liang Zhu*, Yan Ling Qiu

Keywords:

Disinfection By-Products, Humic Acid (HA), Titanium Dioxide, Trihalomethanes, Ultraviolet

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