Rapid water quality characterization for chlorine demand and THM formation in drinking waters

Jegatheesan, V., Weragoda, S., and Visvanathan, C. (2008) Rapid water quality characterization for chlorine demand and THM formation in drinking waters. Journal of Water Supply Research and Technology - AQUA, 57 (4). pp. 259-272.

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View at Publisher Website: http://dx.doi.org/10.2166/aqua.2008.043


The quality of drinking water generally deteriorates when it is delivered through a distribution system due to the decay of disinfectant, which subsequently allows the re-growth of microorganisms in the distribution system in addition to the formation of trihalomethane (THM). Therefore, a model which describes the changes that occur in the water quality in the distribution system is needed to determine whether to enhance the treatment processes or to improve the distribution system so that microbiological criteria are met. In this paper the chlorine decay kinetics and THM formation in treated water is modeled considering the reaction of chlorine with fast and slow reacting organic and nitrogenous compounds which are present in that water. The treated water was also passed through three types of resins to fractionate very hydrophobic acids (VHA), slightly hydrophobic acids (SHA), hydrophilic charged (CHA) and hydrophilic neutral (NEU) compounds which are present in the water. Chlorine decay tests were conducted on the effluents emerging from the resins to evaluate the chlorine demand and THM formation potential of those organic fractions. The model shows that the CHA presented in the waters has a very high THM formation potential (around 62% of the THM produced). VHA, NEU and CHA contributed to chlorine demand in the water.

Item ID: 6749
Item Type: Article (Research - C1)
ISSN: 1605-3974
Keywords: chlorine decay; nitrogenous componds; organic fractionation; Organic /inorganic compounds; THM; water quality modelling
Date Deposited: 02 Mar 2010 00:49
FoR Codes: 09 ENGINEERING > 0904 Chemical Engineering > 090401 Carbon Capture Engineering (excl Sequestration) @ 100%
SEO Codes: 96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 50%
96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961101 Physical and Chemical Conditions of Water for Urban and Industrial Use @ 50%
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