rejection enhancing method of reverse osmosis membrane, rejection enhancing treatment agent and reverse osmosis membrane

摘要

PROBLEM TO BE SOLVED: To provide a method for improving a blocking rate of a reverse osmosis membrane by which a blocking rate can be effectively improved without greatly reducing a permeation flux and even when applied to a remarkably deteriorated membrane.SOLUTION: In the method for improving the blocking rate of the reverse osmosis membrane, a first organic compound with molecular weight of 200, a second organic compound with molecular weight of ≥200 and 500 and a third organic compound with molecular weight of ≥500 are made to pass through the reverse osmosis membrane. An amino acid or an amino acid derivative is suitable as the first organic compound. Preferably total concentration of the first organic compound and the second organic compound and the concentration of the third organic compound are respectively 1 to 500 mg/L.