WATER QUALITY EVALUATION METHOD AND OPERATION MANAGEMENT METHOD FOR WATER TREATMENT APPARATUS

PROBLEM TO BE SOLVED: To provide a water quality evaluation method for easily obtaining, with high accuracy, an index of the pollution degree of water for a separation membrane when water-soluble polymers are contained in the water supplied to a membrane separation device.SOLUTION: Clarified water not containing membrane pollution substance represented by RO permeated water is made to pass an MF membrane, filterability of the clarified water is measured, thereafter sample water supplied to the membrane separation device is made to pass the MF membrane, and filterability of the sample water is measured. With a ratio between the filterability of the sample water and the filterability of the clarified water at that time, the pollution degree for the separation membrane of the membrane separation device due to the water-soluble polymers contained in the sample water is evaluated.