A water treatment process and a water disposal system

Japanese Patent JP6061446

B2

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 first reverse osmosis membrane separation step of soft water; and a degassing step of a permeate. 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 5b, 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%.

Kazuki Matsumoto
Atsushi Manabe
Shinji Matsutomo
Shuhei Izumi
Hayato Watanabe
Takashima Yuji

JP2011048315A

January 18, 2017

March 04, 2011

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Miura Industry Co., Ltd.

C02F1/44; B01D61/04; B01D61/42; B01D61/58; B01D71/56; B01J49/05; B01J49/30; B01J49/75; C02F1/42; C02F1/469; C02F9/04; C02F9/06

JP200051665A
JP9271647A
JP2009233607A
JP200855317A

WO2010103640A1

Iwaike Mitsuru

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