Systems and methods for controlling a chloramine synthesis reaction in industrial water systems

A system for controlling a chloramine synthesis reaction in a hard water stream, the system comprising:

• at least one water pump configured to deliver (i) a first water stream to a first junction where the first water stream is mixed with a first solution including an ammonium compound, and (ii) a second water stream to a second junction where the second water stream is mixed with a second solution including hypochlorite;
• a reaction chamber downstream of the first junction and the second junction which is configured to mix the first water stream and the second water stream in order to react the ammonium compound and the hypochlorite to form chloramine in an outflow water stream;
• an optical measurement device disposed upstream of the second junction, the optical measurement device configured to measure an absorbance of the hypochlorite in the second solution;
• and
• at least one controller programmed to determine and adjust at least one of a flow rate of the second solution and a concentration of the hypochlorite in the second solution based on the measured absorbance.