PROBLEM TO BE SOLVED: To provide a membrane blockage estimation method of reverse osmosis membrane supply water capable of conveniently and precisely estimating membrane blockage of water to be supplied to a reverse osmosis membrane.SOLUTION: A membrane blockage estimation method of supply water 3 for estimating membrane blockage of the supply water 3 to be supplied to a reverse osmosis membrane includes: a first measurement process of measuring a fluorescence intensity and fouling speed of the supply water 3; a second measurement process of fluorescence intensity and fouling speed of pretreatment water 7 subjected to pretreatment 102 for lowering membrane blockage of the supply water 3; a repetition process of repeating the second measurement process by changing conditions of pretreatment 102; an approximate expression making process of making an approximate expression from a relation between the fouling speed and the fluoresce intensity obtained from the first measurement process up to the repetition process; and a fouling speed determination process of determining the fouling speed by applying the fluorescence intensity of the supply water 3 of which the fouling speed is not measured as yet to the approximate relation. Thereby, the fouling speed of the supply water 3, that is, the membrane blockage can be estimated quickly and precisely.SELECTED DRAWING: Figure 1
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