Trihalomethane hydrolysis in drinking water at elevated temperatures

Xiao lu Zhang, Hong wei Yang, Xiao mao Wang, Tanju Karanfil, Yuefeng F. Xie

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Hydrolysis could contribute to the loss of trihalomethanes (THMs) in the drinking water at elevated temperatures. This study was aimed at investigating THM hydrolysis pertaining to the storage of hot boiled water in enclosed containers. The water pH value was in the range of 6.1-8.2 and the water temperature was varied from 65 to 95°C. The effects of halide ions, natural organic matter, and drinking water matrix were investigated. Results showed that the hydrolysis rates declined in the order following CHBrCl2>CHBr2Cl>CHBr3>CHCl3. THM hydrolysis was primarily through the alkaline pathway, except for CHCl3 in water at relatively low pH value. The activation energies for the alkaline hydrolysis of CHCl3, CHBrCl2, CHBr2Cl and CHBr3 were 109, 113, 115 and 116kJ/mol, respectively. No hydrolysis intermediates could accumulate in the water. The natural organic matter, and probably other constituents, in drinking water could substantially decrease THM hydrolysis rates by more than 50%. When a drinking water was at 90°C or above, the first order rate constants for THM hydrolysis were in the magnitude of 10-2-10-1 1/h. When the boiled real tap water was stored in an enclosed container, THMs continued increasing during the first few hours and then kept decreasing later on due to the competition between hydrolysis and further formation. The removal of THMs, especially brominated THMs, by hydrolysis would greatly reduce one's exposure to disinfection by-products by consuming the boiled water stored in enclosed containers.

Original languageEnglish (US)
Pages (from-to)18-27
Number of pages10
JournalWater Research
Volume78
DOIs
StatePublished - Jul 1 2015

Fingerprint

Potable water
hydrolysis
Hydrolysis
drinking water
temperature
Temperature
Water
Containers
Biological materials
water
organic matter
halide
Disinfection
activation energy
disinfection
Byproducts
Rate constants
water temperature
Activation energy
matrix

All Science Journal Classification (ASJC) codes

  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

Cite this

Zhang, Xiao lu ; Yang, Hong wei ; Wang, Xiao mao ; Karanfil, Tanju ; Xie, Yuefeng F. / Trihalomethane hydrolysis in drinking water at elevated temperatures. In: Water Research. 2015 ; Vol. 78. pp. 18-27.
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Trihalomethane hydrolysis in drinking water at elevated temperatures. / Zhang, Xiao lu; Yang, Hong wei; Wang, Xiao mao; Karanfil, Tanju; Xie, Yuefeng F.

In: Water Research, Vol. 78, 01.07.2015, p. 18-27.

Research output: Contribution to journalArticle

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