Impact of EPA Drinking Water Stage 2 Disinfectant and Disinfectant ...

Monochloramine Monitoring41• Chlorine-Ammonia Treatment– NH 3 is added to the chlorinated water to formmonochloramines:HOCl + NH 4 OH à NH 2 Cl + 2 H 2 O– Excess of NH 3 will consume all Free Chlorine andcontaminates the water– Too little NH 3 means too much Free Chlorine is left,which will react with NH 3 to form unwantedDichloramines and other byproducts.– An ammonia monitor can also be employed tomonitor and control ammonia.Disinfection