Title:
水処理方法及び水処理システム
Document Type and Number:
Japanese Patent JP5673225
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 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, a first regeneration process for regenerating the whole of a cation exchange resin bed, and a second regeneration process for regenerating a part of the cation exchange resin bed. In the second 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. The RO membrane module 5b 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:
松本 一樹
真鍋 敦行
松友 伸司
泉 修平
渡邉 隼人
高島 悠司
真鍋 敦行
松友 伸司
泉 修平
渡邉 隼人
高島 悠司
Application Number:
JP2011048312A
Publication Date:
February 18, 2015
Filing Date:
March 04, 2011
Export Citation:
Assignee:
三浦工業株式会社
International Classes:
C02F1/42; B01D61/04; B01D61/44; B01D61/58; B01D71/56; B01J49/00; C02F1/20; C02F1/44; C02F1/469; C02F9/00
Attorney, Agent or Firm:
岩池 満
Ryuta Kato
Ryuta Kato