TREATMENT METHOD FOR REVERSE OSMOSIS MEMBRANE ELEMENT AND REVERSE OSMOSIS MEMBRANE MODULE

摘要

PROBLEM TO BE SOLVED: To provide a treatment method for a reverse osmosis membrane capable of keeping effect for reducing the concentration of a solute in water permeated through the reverse osmosis membrane for a long time and capable of separating even non-electrolyte organic matter or boron or the like not dissociated in a neutral region in a high blocking ratio, and a reverse osmosis membrane module. SOLUTION: In a membrane separator loaded with the reverse osmosis membrane element having a polyamide skin layer, the pressure container in the membrane separator is filled with the reverse osmosis membrane element and a free chlorine aqueous solution containing bromine is subsequently brought into contact with the reverse osmosis membrane element.