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1. (WO2018142904) METHOD FOR MODIFYING REVERSE OSMOSIS MEMBRANE, REVERSE OSMOSIS MEMBRANE, METHOD FOR TREATING WATER CONTAINING NON-CHARGED SUBSTANCE, OPERATION METHOD FOR REVERSE OSMOSIS MEMBRANE, AND REVERSE OSMOSIS MEMBRANE DEVICE

Pub. No.:    WO/2018/142904    International Application No.:    PCT/JP2018/000844
Publication Date: Fri Aug 10 01:59:59 CEST 2018 International Filing Date: Tue Jan 16 00:59:59 CET 2018
IPC: B01D 67/00
B01D 65/00
B01D 71/56
C02F 1/44
Applicants: ORGANO CORPORATION
オルガノ株式会社
Inventors: TAKADA Akihiro
高田 明広
NAKAMURA Yuki
中村 勇規
Title: METHOD FOR MODIFYING REVERSE OSMOSIS MEMBRANE, REVERSE OSMOSIS MEMBRANE, METHOD FOR TREATING WATER CONTAINING NON-CHARGED SUBSTANCE, OPERATION METHOD FOR REVERSE OSMOSIS MEMBRANE, AND REVERSE OSMOSIS MEMBRANE DEVICE
Abstract:
A method for modifying a reverse osmosis membrane is provided with which it is possible to regulate the reverse osmosis membrane so as to have a given rejection of non-charged substances. The method, which is for modifying a polyamide-based reverse osmosis membrane, comprises bringing a halogen-based oxidant into contact with the reverse osmosis membrane to thereby change the rejection of non-charged substances, the modification being conducted on the basis of found flux values, in terms of pure water, of the reverse osmosis membrane. Furthermore, an operation method for a reverse osmosis membrane is provided in which a modified polyamide-based reverse osmosis membrane can be inhibited from suffering a decrease in rejection performance due to alkali cleaning. The operation method for a reverse osmosis membrane comprises: a reverse osmosis membrane treatment step in which water to be treated is passed through a polyamide-based reverse osmosis membrane that has been modified by contact with a bromine-compound oxidant, thereby obtaining penetrant water and concentrated water; and an alkali cleaning step in which the modified reverse osmosis membrane is cleaned with an alkali at a pH of 8 or higher.