Patent ID: 6881583

Claim:
A method of determining the optimal chloramination of a supply of water containing ammonia and chlorination compounds, comprising the steps of: a. raising the pH of a first sample of the water to at least 8 and determining the molar ammonia concentration in the supply of water; b. Determining and summing the molar concentrations of Cl 2 , plus hypochlorite, plus hypochlorous acid, plus monochloramine in a second sample of the water, to yield a first concentration; c. lowering the pH of the second sample of the water to less than 3 and determining and summing the molar concentrations of Cl 2 , plus hypochlorite, plus hypochlorous acid, plus monochloramine, plus dichloramine multiplied by two, plus trichloramine multiplied by three, in the supply of water, to yield a second concentration; d. subtracting the first concentration from the second concentration to derive a higher-chloramine chlorine concentration; e. and performing a comparison of the higher-chloramine chlorine concentration to the ammonia concentration to derive an ammonia error signal.