REVERSE OSMOSIS MEMBRANE TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a reverse osmosis membrane treatment method in which such a high concentration rate is achieved that the concentration of silica in concentrated water becomes equal to or higher than the saturation solubility of silica and the flushing step of which is adopted as a preventive means of fouling of a reverse osmosis membrane and is improved so that flushing work can be performed effectively in a time as short as possible with a small amount of cleaning water. ! SOLUTION: The reverse osmosis membrane treatment method comprises: a separation step of separating the water, which is to be treated and contains silica and a hardness component, into permeated water and the concentrated water having the silica concentration equal to or higher than the saturation solubility of silica by using the reverse osmosis membrane; and the flushing step of flushing the water to be treated toward the concentrated water-side surface of the reverse osmosis membrane by a predetermined amount thereof