WATER-QUALITY EVALUATION METHOD

摘要

A water-quality evaluation method for water to be treated which evaluates the water quality of water 12 to be treated, the water-quality evaluation method having: a fine-particle removal step for obtaining filtered water 14 by filtering the water 12 to be treated by using a first filtration membrane 13A, and collecting fine particles or a turbid component 11 contained in the water 12 to be treated; a filterability measurement step for clarified water which measures the filterability of clarified water 15, by using a second filtration membrane 13B which differs from the first filtration membrane 13A and passing the clarified water 15 therethrough; a filterability measurement step for filtered water which measures the filterability of the filtered water 14, by filtering the filtered water 14 through the second filtration membrane 13B used in the clarified water 15 filterability measurement step; and a contamination-degree evaluation step for evaluating the degree of contamination of the water 12 to be filtered, on the basis of the measured clarified water filterability and the measured filtered water filterability.