REVERSE OSMOSIS MEMBRANE DEVICE AND OPERATION METHOD THEREOF, METHOD OF PREPARATION OF WATER AND CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method for operating a reverse osmosis device capable of controlling or regulating conditions of plant operation while monitoring the level of bromine or boron in the permeated water obtained from a reverse osmosis module. ;SOLUTION: In focussing on a particular relationship between the salt permeation coefficient P in the permeated water calculated by means of reverse osmosis and the permeation coefficient PB of the particular ingredient (for example, boron) in the permeated water, the condition of the plant operation is controlled or regulated in accordance with the assumed concentration of boron CBP obtained by assuming the concentration of boron CBP in the permeated water from the concentration of salt CP in the permeated water. For example, when the boron concentration is high in the permeated water, the operation pressure is raised as well as the number of operation lines of reverse osmosis elements is reduced to thereby obtain a permeated water meeting the standard value of the water quality.;COPYRIGHT: (C)2001,JPO