AWWA ACE68962

This powerpoint presentation begins by providing a brief overview of chloramine chemistry and water quality issues that can arise from nitrification. The impact of source water blending on nitrification is presented, along with a brief overview of case studies at Western Municipal Water District (WMWD) and at the City of La Habra. Presentation summary and conclusions indicate the following: WMWD concluded that chloramination of their Murrieta wells would allow maximum operational flexibility throughout the year; La Habra did not observe significant nitrification in the system, likely due to wintertime free chlorination (i.e., burnout); and, considerations for utilities blending chlorinated and chloraminated source waters include location of blending - reservoir/tank or pipeline, seasonal water usage - natural free Cl₂ burnout periods, and disinfection byproduct (DBP) formation potential and possibility of breakpoint chlorination. Includes tables, figures.