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AWWA WQTC69234
- A Systematic Water Quality Enhancement Approach Using Distributed Rechlorination and Network Modeling
- Conference Proceeding by American Water Works Association, 11/01/2008
- Publisher: AWWA
$12.00$24.00
This powerpoint presentation begins by presenting study objectives that include the following: develop a dynamic model to predictdistribution system chlorine residual;optimize distribution system chlorine residual;minimize distribution system TTHM level; and,save chemical costs. A brief overview of the Las Vegas Valley Water District (LVVWD) supply and distribution system, and distributed rechlorination system is presented, along with system challenges that include the following: complex distributed chlorination; various convection, dispersion andblending in the distribution systemnetwork; and,complicated chlorine reaction withdifferent materials, chemicals anddeposits. Approach methodology included the following:utilize supervisory control and data acquisition (SCADA) information and LaboratoryInformation Management System (LIMS) data; simplify chlorine model by grouping reactionconstants; calibrate chlorine model using field testscoupled with a Genetic Algorithm (GA)optimization; and,continue model calibration accountingoperation changes or system expansion. Potential benefits include:improved understanding of water qualityvariations in a complex water distributionsystem;ensured adequate residual chlorinethroughout the system;saved chemical costs by optimizingchlorine dose; and, minimized TTHM growth by tracking andreducing bulk chlorine demand throughdaily operations. Includes figures.
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