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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 28 / 47

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Reaction of Ammonia with Chlorine:  Breakpoint Chlorination

Presence of ammonia in water or wastewater and the addition of free chlorine results in an available chlorine curve with a “hump”

At chlorine doses between the hump and the dip, chloramines are being oxidatively destroyed and nitrogen is lost (between pH 6.5-8.5).

Chlorine added, mg/L

Combined Cl2 present

Free chlorine present

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