Desalination system and desalination method

Patent metadata

Field	Value
Publication number	US-10005688-B2
Application number	US-201214232955-A
Country	US
Kind code	B2
Filing date	Aug 16, 2012
Priority date	Aug 26, 2011
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

This desalinization system, which obtains industrial-use water and drinking water from seawater and wastewater, is provided with: a purification device that purifies wastewater by removing activated sludge therefrom; a first RO membrane that removes salt from the output of the purification device by transferring said salt to first concentrated water, thereby producing industrial-use water; a UF membrane that seawater passes through and that removes particulates from said seawater; a second RO membrane that removes salt from the treated output of the UF membrane by transferring said salt to second concentrated water, producing drinking water; an agitation device to which the second concentrated water from the second RO membrane and the first concentrated water from the first RO membrane are sent to be agitated; and a third RO membrane removing salt from the liquid mixture agitated by the agitation device by transferring said salt to third concentrated water, producing industrial-use water.

First claim

The invention claimed is:

1. A sea-water desalination system for acquiring industrial water and drinking water from sea-water and sewage water, comprising:
a purification apparatus for
purifying sewage water;

a first RO membrane for
generating industrial water and a first concentrated-water from the sewage water that has been purified by the purification apparatus;

a UF membrane for removing particles in sea-water by permeating the sea-water;
a second RO membrane for
generating a second concentrated-water and drinking water from permeated water that has been filtered by the UF membrane;

a stirring apparatus for stirring the second concentrated-water generated by the second RO membrane and the first concentrated-water generated by the first RO membrane being sent thereto; and
a third RO membrane for
generating a third concentrated-water and the industrial water from mixture fluid stirred by the stirring apparatus.

2. A sea-water desalination system according to claim 1 , comprising at least either of a first energy recovery device for recovering pressure energy of the second concentrated-water or a second energy recovery device for recovering pressure energy of the third concentrated-water.

3. A sea-water desalination system according to claim 1 , wherein the first RO membrane is configured to operate at a permeation pressure of approximately 1 to 2 MPa; the second RO membrane is configured to operate at a permeation pressure of approximately 6 to 8 MPa; and the third RO membrane is configured to operate at a permeation pressure of approximately 6 to 8 MPa.

Assignees

• SEKINE Yasunori
• Noto Kazuhiko
• Sasaki Akira
• Kitamura Kotaro
• Hitachi Ltd

Inventors

• SEKINE Yasunori
• Noto Kazuhiko
• Sasaki Akira
• Kitamura Kotaro

Classifications

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• B01D61/58

  Multistep processes · CPC title

• C02F9/00 Primary

  Multistage treatment of water, waste water or sewage · CPC title

• C02F3/1273

  Submerged membrane bioreactors · CPC title

• Y02W10/15

  Cross-Sectional Technologies · mapped topic