Title:
水処理方法及び水処理システム
Document Type and Number:
Japanese Patent JP5786376
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a water treatment method that can maintain a high salt removal rate and a high permeate flow rate even when hard water of poor water quality is used.SOLUTION: The water treatment method includes: a soft water degassing step; and a first reverse osmosis membrane separation step of treated water having been subjected to degassing treatment. Also, the method includes a raw water softening process, and a regeneration process for regenerating the whole of a cation exchange resin bed by a counter flow. In the regeneration process, a regenerant amount of a regeneration level of 1-6 eq/L-R is supplied to a hardness leak prevention bed. In the softening process, raw water having an electrical conductivity of 150 mS/m or less and a total hardness of 500 mgCaCO/L or less is supplied. A negatively chargeable skin layer made of a crosslinked wholly aromatic polyamide is formed on the membrane surface in the RO membrane module 6b, which has a reverse osmosis membrane having a water permeability coefficient of 1.5×10m/ms/Paor more and a salt removal rate of 99% or more when a sodium chloride aqueous solution having a concentration of 500 mg/L of pH 7.0, and a temperature at 25°C is supplied thereto at an operating pressure of 0.7 MPa and at a recovery rate of 15%.
Inventors:
Kazuki Matsumoto
Atsushi Manabe
Shinji Matsutomo
Shuhei Izumi
Hayato Watanabe
Takashima Yuji
Atsushi Manabe
Shinji Matsutomo
Shuhei Izumi
Hayato Watanabe
Takashima Yuji
Application Number:
JP2011048314A
Publication Date:
September 30, 2015
Filing Date:
March 04, 2011
Export Citation:
Assignee:
Miura Industry Co., Ltd.
International Classes:
C02F1/42; B01D61/02; B01D61/04; B01D61/08; B01D61/48; B01D61/58; B01D69/12; B01D71/56; B01J39/18; B01J47/02; B01J49/00; C02F1/44; C02F1/469; C02F9/00
Domestic Patent References:
| JP2000051665A | ||||
| JP2008142596A | ||||
| JP2010082610A | ||||
| JP2000070933A | ||||
| JP2001137847A | ||||
| JP2008029963A | ||||
| JP2008055317A | ||||
| JP9299947A | ||||
| JP2000301146A | ||||
| JP2000015257A | ||||
| JP2008086945A | ||||
| JP2012183482A | ||||
| JP10033959A | ||||
| JP4766459B1 | ||||
| JP2012130888A | ||||
| JP2007260574A |
Foreign References:
| WO2010103640A1 | ||||
| WO2010126113A1 | ||||
| DE102006024868A1 |
Other References:
川崎睦男、河田一郎,超低圧逆浸透膜「ESシリーズ」,膜 MEMBRANE,日本膜学会,1997年 3月 1日,Vol.22 No.2,pp.111-113
Attorney, Agent or Firm:
Iwaike Mitsuru
Ryota Kato
Ryota Kato