CHEMICAL INJECTION CONTROL METHOD AND CHEMICAL INJECTION CONTROLLER

摘要

PROBLEM TO BE SOLVED: To suppress a necessary or more injection amount of a chemical and to perform the injection of the chemical corresponding to the water quality fluctuation of raw water.

SOLUTION: A chemical injection control apparatus 1 corrects the injection ratio of the chemical on the basis of the deviation between the measured value of the water quality index of treated water due to the operation of a chemical injection pump based on a preset chemical injection ratio and the target value of the water quality index to calculate the optimum chemical injection ratio. Subsequently, multiple regression analysis setting the optimum chemical injection ratio to a target variable and setting at least one kind water quality index of raw water to an explanation variable is performed and an operational expression of the fundamental chemical injection ratio corresponding to the water quality index is led out. Next, the fundamental chemical injection ratio is corrected on the basis of the measured value of the water quality index of the treated water due to the operation of the chemical injection pump to newly calculate the chemical injection ratio to output the same as the control factor of the chemical injection pump while subjecting the same to the operation of the optimum chemical injection ratio.

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