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AWWA WQTC65775
- Use of SDS-THM to Evaluate Treatment Need for Unfiltered Supplies
- Conference Proceeding by American Water Works Association, 11/01/2007
- Publisher: AWWA
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This powerpoint presentation begins by providing background information on treating surface water supplies in Quebec, Canada. Project objectives were to: evaluate the impact of storage conditions (temperatureand storage time);evaluate the relative importance of incubationparameters (pH, temperature, Cl<sub>2</sub> dose and contact time); and,compare Trihalomethane-simulated distribution system (THM-SDS) testing with site specific THM; and,identify alternate indicators (SUVA, ultraviolet [UV] absorbance, chemical oxygen demand [COD]and chlorine demand). Conclusions were that: storage up to 7 days had a limited impact on theTHM precursors;for incubation time above 24 h, temperature wasthe most important parameter impacting THMformation, its effect was similar across sourcewater;the effects of pH and chlorine dosage were sourcespecific;increasing contact time from 24 h to 48 h had amoderate impact on THM (13-27% increase); THM precursors were fairly stable over the studyperiod, a limited number of sampling campaignswould have been sufficient to adequatelycharacterize these systems;THM-SDS predicted reasonably well historicalTHM concentrations; and,even though chlorine demand was highlycorrelated with THM formation, the predictionerror was too high to justify abandoning THM-SDSassays to the profit of chlorine demand tests. Includes tables, figures.
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