AWWA ACE65138

The primary goal of this project was to improve the understanding of how water quality changes as a result of a temporal switch from a monochloramine residual to a free chlorine residual. Research tasks included: sampling of full-scale distribution systems; pilot-scale experiments; and, batch experiments. Topics outlined include: Nitrification in Chloraminated Distribution Systems; Ammonia production in chloraminated systems; Nitrogen Cycling in the distribution system; Sequence of Events Leading to Nitrification; how utilities manage nitrification episodes; Control Strategies - Free Chlorination; strategy for Full Scale Distribution System Sampling; strategy for Pilot Scale Experiments; and, strategy for batch experiments. Includes tables, figures.