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AWWA WQTC69236
- Using Tracer Studies and Water Quality Analysis to Improve Water Quality by Better Hydraulic Management in Distribution Systems
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
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The objective of this research project was to evaluate operational strategies for reducing waterresidence time in distribution networks to favor adequate concentrations of residual chlorine whileminimizing disinfection byproducts (DBPs) in problematic sectors, such as low consumption areas and areas with a highnumber of dead-ends, as illustrated in a case study of Quebec City, Canada. The paper focuses on the approach for determination ofwater travel patterns in the distribution system, in variable hydraulic conditions.The case study is the main distribution system of Quebec City, supplied by the St. CharlesRiver at Loretteville Drinking Water Plant (DWP). It is a widespread network that provides water to about 40% of thecity's population (i.e. about 230,000 people). This distribution system has possible unwanted andunknown interconnections with neighboring networks. Once the hydraulic model was completed, preliminary water age and chlorine residuals werecalculated using EPANET. Two sampling campaigns were designed, in different sectors and periodsof time, using tracers to monitor water age at different locations. Results from these campaigns willbe used to calibrate the hydraulic model to evaluate hydraulic scenarios to reduce water age, enhanceresidual chlorine concentration and, thus, improve water quality. Includes 8 references, figures.
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