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

Title:

Document Type and Number:

WIPO Patent Application WO/2018/142904

Kind Code:

A1

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.

More Like This:

JP2885712	INDUSTRIAL APPLICABILITY [Asymmetric single membrane polymer solution and asymmetric single membrane using the same
WO/2019/044196	SEPARATION MEMBRANE, SEPARATION MEMBRANE MODULE, SEPARATION DEVICE, SEPARATION MEMBRANE FORMATION COMPOSITION, PRODUCTION METHOD FOR COMPOSITE MEMBRANE FOR SEPARATION, AND CELLULOSE COMPOUND
WO/2014/091159	FORMULATION OF A POROUS FLUORINATED MEMBRANE USED BY MEANS OF A DRAWING PROCESS

Inventors:

TAKADA AKIHIRO (JP)
NAKAMURA YUKI (JP)

Application Number:

PCT/JP2018/000844

Publication Date:

August 09, 2018

Filing Date:

January 15, 2018

Export Citation:

Click for automatic bibliography generation Help

Assignee:

ORGANO CORP (JP)

International Classes:

B01D67/00; B01D65/00; B01D71/56; C02F1/44

Domestic Patent References:

WO2016136304A1

2016-09-01

Foreign References:

JP2015217353A	2015-12-07
JP2016155071A	2016-09-01
JP2015117216A	2015-06-25
JP2016073915A	2016-05-12
JP2008246448A	2008-10-16

Attorney, Agent or Firm:

YKI PATENT ATTORNEYS (JP)

Download PDF:

View/Download PDF PDF Help

Previous Patent: SYSTEMS AND METHODS FOR PARTITIONING A PICTURE INTO VIDEO BLOCKS FOR VIDEO CODING

Next Patent: ELECTRIC POWER STEERING DEVICE