A water treatment process and a water disposal system

Japanese Patent JP6061445

B2

PROBLEM TO BE SOLVED: To provide a water treatment method in which a high salt removal rate and a large amount of permeated water can be kept even when hard water having very poor quality is used.SOLUTION: The water treatment method includes: a softening process for producing soft water; and a regeneration process for regenerating the whole of a cation exchange resin bed by a countercurrent. In the regeneration process, a regenerating solution having a 1-6 eq/L-R regeneration level is supplied to a hardness leak prevention bed. In the softening process, raw water having ≤150 mS/m electrical conductivity and ≤500 mg CaCO/L total hardness is supplied. An RO membrane module 5b has a reverse osmosis membrane on the surface of which a negative-charged skin layer comprising crosslinked wholly aromatic polyamide is formed and which has a ≥1.5×10m-m-s-Pawater permeability coefficient when a sodium chloride aqueous solution having a 500 mg/L concentration, pH 7.0, and a 25°C temperature is supplied under 0.7 MPa operating pressure at a 15% recovery rate, and has a ≥99% salt removal rate.

Takashima Yuji
Atsushi Manabe
Shuhei Izumi
Hayato Watanabe
Kazuki Matsumoto

JP2011048313A

January 18, 2017

March 04, 2011

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Miura Industry Co., Ltd.

C02F1/42; B01D61/00; B01D61/04; B01D61/08; B01D61/48; B01D61/58; B01D69/12; B01D71/56; B01J49/53; B01J49/70; B01J49/75; C02F1/44; C02F1/469; C02F9/06

JP200051665A
JP9271647A
JP2009233607A
JP200855317A

WO2010103640A1

Iwaike Mitsuru

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