AWWA DSS65655

This powerpoint presentation begins by providing an overview of water quality (WQ) problems, including: loss of disinfection residual; high disinfection byproduct (DBP) formation; Taste and Odor; and, Colored and Turbid Water. WQ Monitoring Needs are presented and include: Maintain Integrity of Drinking Water; Regulatory Compliance; Operational Process Control; and, Consumer Satisfaction. Typical WQ related questions are presented, along with WQ models and requirements, and WQ modeling examples of small and large utilities. Small utility conclusions were that: high chlorine decay rate in surface water, worth investing treatment improvements to maintain residual; increased chlorine concentrations at the wells will help to maintain system-wide chlorine levels; slightly higher chlorine levels were predicted in the blended zones; should not have an adverse impact on DBP levels; and, increased chlorine dosing at surface water treatment plant could increase DBPs. Includes figures.