公开(公告)号：US20190321786A1

公开(公告)日：2019-10-24

申请号：US16461946

申请日：2017-11-16

Applicant: ORGANO CORPORATION

Inventor： Yuki NAKAMURA ,  Akihiro TAKADA

IPC: B01D67/00 ,  B01D61/02 ,  B01D61/08 ,  B01D69/02 ,  C02F1/44

Abstract: A reverse osmosis membrane treatment system is provided with a first reverse osmosis membrane treatment device wherein water to be treated is passed through a first reverse osmosis membrane to obtain first permeate water and first concentrated water, and at least a second reverse osmosis membrane treatment device, wherein the first permeate water is passed through a second reverse osmosis membrane to obtain second permeate water and second concentrated water. The permeation flux per 1 MPa of effective pressure for the second reverse osmosis membrane is lower than the permeation flux per 1 MPa of effective pressure for the first reverse osmosis membrane, and the permeation flux per 1 MPa of effective pressure for the second reverse osmosis membrane is 0.5 m3/m2/d or less.