WATER TREATMENT METHOD, AND WATER TREATMENT SYSTEM

Title:

WATER TREATMENT METHOD, AND WATER TREATMENT SYSTEM

Document Type and Number:

WIPO Patent Application WO/2015/001885

Kind Code:

A1

Abstract:

Provided are a water treatment system and a water treatment method with which salt-containing water can be recycled with a high water recovery rate. In this water treatment system (400) and water treatment method, a scale inhibitor and a silica-scale inhibitor are supplied to water to be treated including Ca ions, SO4 ions, carbonate ions, and silica, and the water to be treated is subsequently separated by a second desalination unit (210) into treated water, and second concentrated water in which the Ca ions, SO4 ions, carbonate ions, and silica are concentrated. In a second crystallization unit (220), gypsum seed crystals are supplied to the second concentrated water, and gypsum crystallizes and is removed from the second concentrated water.

Inventors:

EDA MASAYUKI (JP)
OKINO SUSUMU (JP)
YOSHIYAMA RYUJI (JP)
SAKURAI HIDEAKI (JP)
UKAI NOBUYUKI (JP)
SUZUKI HIDEO (JP)
NAKASHOJI HIROSHI (JP)
YOSHIOKA SHIGERU (JP)

Application Number:

PCT/JP2014/064514

Publication Date:

January 08, 2015

Filing Date:

May 30, 2014

Export Citation:

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Assignee:

MITSUBISHI HEAVY IND LTD (JP)

International Classes:

C02F9/00; B01D9/02; B01D19/00; B01D61/08; B01D61/42; B01D61/58; C02F1/20; C02F1/42; C02F1/44; C02F1/469; C02F1/52; C02F5/00; C02F5/10; C02F5/14

Foreign References:

JPS62294484A	1987-12-21
JP2011200788A	2011-10-13
JPH10113660A	1998-05-06
JP2000511109A	2000-08-29
JP2000237748A	2000-09-05
JP2000015257A	2000-01-18
JP2013520315A	2013-06-06
JPH1085742A	1998-04-07
JP2011147899A	2011-08-04
JP2004141799A	2004-05-20
JPH10128052A	1998-05-19
JPS5916588A	1984-01-27
US7815804B2	2010-10-19

Other References: