Full Description

The treatment procedures aimed at producing drinking water induce major modificationson the properties of natural organic matter (NOM). A better knowledge of the fate ofNOM within distribution systems can be valuable information for utilities that practicere-chlorination and for large systems where residence time of water is high. The aim ofthis investigation is to characterize the reactivity of DBP precursors occurring in waterdistribution systems by demonstrating the temporal and spatial evolution of theorganic matter (OM). For example, four points of the distribution system ofQuebec City (Canada) water utility were selected for the collection of data. The appliedstrategy allows for an evaluation of the impact of residence time on the formation ofDBPs and on the changes of OM throughout the pipes. The methodology developed forthis project is based on existing NOM fractionation techniques (using DAX-8 and XAD-4resins) allowing to observe behavior that cannot be observed easily when the integralsample is manipulated. Finally, OM reactivity is investigated using experimentalchlorination tests on fractionated and non-fractionated samples under controlledconditions of pH, temperature and chlorine dose. Includes 11 references, table, figures.

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Edition: Vol. - No. Published: 06/17/2004 Number of Pages: 13File Size: 1 file , 990 KB