WATER TREATMENT METHOD, AND WATER TREATMENT SYSTEM

Title:

WATER TREATMENT METHOD, AND WATER TREATMENT SYSTEM

Document Type and Number:

WIPO Patent Application WO/2015/001888

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. This water treatment system (100) is provided with: second desalination units (210a, 210b) for separating water to be treated including Ca ions, SO4 ions, and carbonate ions, into treated water and concentrated water in which the Ca ions and SO4 ions are concentrated; crystallization units which are provided to downstream sides of the second desalination units (210a, 210b), and which are provided with second crystallization tanks (221a, 221b) for inducing crystallization of gypsum from the concentrated water, and seed-crystal supply units for supplying gypsum seed crystals to the second crystallization tanks (221a, 221b); and separation units which separate gypsum from the concentrated water at downstream sides of the crystallization units.

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/JP2014/064518

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

Domestic Patent References:

WO2012008013A1

2012-01-19

Foreign References:

JPS62294484A	1987-12-21
JP2011200788A	2011-10-13
JPH10113660A	1998-05-06
JP2000237748A	2000-09-05
JP2000015257A	2000-01-18
JP2002011466A	2002-01-15
JP2003190707A	2003-07-08
JPH04271893A	1992-09-28
JP2001314873A	2001-11-13
JP2004141799A	2004-05-20
US7815804B2	2010-10-19

Other References: