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Title:
WATER TREATMENT METHOD, AND WATER TREATMENT SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/001886
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 (1) and water treatment method, a scale inhibitor is supplied to water to be treated including Ca ions, SO4 ions, carbonate ions, and silica, and the water to be treated is adjusted to a pH capable of dissolving silica. Having had a calcium-scale inhibitor added thereto and the pH thereof adjusted, the water to be treated is separated by a desalination unit (10) into treated water, and concentrated water in which the Ca ions, SO4 ions, carbonate ions, and silica are concentrated. In a crystallization unit (20), gypsum seed crystals are supplied to the concentrated water, and gypsum crystallizes and is removed from the concentrated water. The silica in the water to be treated is removed from the concentrated water at a downstream side of the crystallization unit (20) with respect to the water to be treated. Calcium carbonate in the water to be treated is removed from the concentrated water at an upstream side of the desalination unit (10), or at a downstream side of the crystallization unit (20).

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/JP2014/064515
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:
JPS62294484A1987-12-21
JPH10113660A1998-05-06
JP2011200788A2011-10-13
JP2000511109A2000-08-29
JP2002011466A2002-01-15
JPH1085742A1998-04-07
JP2010274202A2010-12-09
JP2000015257A2000-01-18
JP2002018437A2002-01-22
JPS5916588A1984-01-27
JPH0760262A1995-03-07
JP2000317262A2000-11-21
JP2004141799A2004-05-20
JP2012200657A2012-10-22
JP2013520315A2013-06-06
US7815804B22010-10-19
Other References:
See also references of EP 3002259A4
Attorney, Agent or Firm:
FUJITA, Takaharu et al. (JP)
Takaharu Fujita (JP)
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