Polymer membrane for water treatment and method for manufacture of same, and water treatment method

a technology of polymer membrane and water treatment method, which is applied in the field of polymer membrane for water treatment the manufacture of same, which can solve the problems of low mechanical strength of cellulose acetate hollow-fiber separation membrane, inability to meet the requirements of water treatment, etc., to achieve efficient water treatment and maintenance, improve water treatment efficiency, and maintain mechanical strength

Inactive Publication Date: 2012-12-27
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0059]According to the present invention, the present invention is possible to provide a polymer membrane for water treatment that maintains mechanical strength, water permeability, and the like, while increasing the water treatment efficiency.
[0060]Also, using the method of the present invention is possible to manufacture the polymer membrane for water treatment which can be successfully satisfy the above properties.
[0061]Further, using the polymer membrane for water treatment can realize efficient water treatment and m...

Problems solved by technology

However, this cellulose acetate hollow-fiber separation membrane has low mechanical strength and its chemical resistance is inadequate.
Consequently, there is a problem in that when the separation membrane becomes contaminated, cleaning employs physical means or chemical means using chemical products and is extremely difficult.
However, poly(vinylidene fluoride) tends to have comparatively weak hydrophilic properties, with low antifouling properties.
However, the energy for the required aeration in immersion-type MBRs is associated with substantial electrical energy costs, which causes an increase in running costs.
However, the treatment rate frequently cannot be accommodated due to problems with pressure resistance with flat-membrane filtration, and equipment other than the raw water pump and energy are required as a solution for preventing the deposition of turbidity components on the membrane surface.
Additionally, as a consequence of the increase in inner diameter of the water treatment membrane, treatment using a tubular membrane requires a firm support frame or an increase in membrane thickness to reduce the resistance to internal pressure during treatment.
On the other hand, when using a support frame, generally back-pressure washing (backwashing) of the hollow-fiber membrane is carried out when the treatment rate decr...

Method used

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  • Polymer membrane for water treatment and method for manufacture of same, and water treatment method
  • Polymer membrane for water treatment and method for manufacture of same, and water treatment method
  • Polymer membrane for water treatment and method for manufacture of same, and water treatment method

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working examples

[0186]Polymer membranes for water treatment and methods for their manufacture of the present invention are described in detail below based on working examples. Furthermore, the present invention is not limited in any way to these working examples.

working example 1

[0187]>

[0188]25 wt % chlorinated vinyl chloride resin (Sekisui Chemical Co., HA31K; degree of chlorination: 67%; degree of polymerization: 800) and 20 wt % poly(ethylene glycol) 400 as a pore formation aid were dissolved in dimethylacetamide. This resin solution was discharged continuously in a substantially level manner into a coagulation tank (filled with water) using a spinneret, and a porous hollow-fiber membrane was obtained due to phase separation in the coagulation tank.

[0189]As shown in FIG. 4, the spinning direction of membrane 34 was oriented to the horizontal, and in coagulation tank 30 (filled with water), 10 m was taken up in a straight line along the horizontal direction 36 from the discharge port of spinneret 31. Within about 1 m downstream therefrom, membrane 34 is raised up about 10 cm by roller 39, and cutting 35 is made by a cutting machine outside coagulation tank 30 and at cutting position 38 higher than position 37 of the discharge port of spinneret 31 which is...

working example 2

[0201]>

[0202]25 wt % chlorinated vinyl chloride resin (Sekisui Chemical Co., HA31K; degree of chlorination: 67%; degree of polymerization: 800) and 20 wt % poly(ethylene glycol) 400 as a pore formation aid were dissolved in tetrahydrofurane. This resin solution was discharged continuously in a substantially level manner into a coagulation tank (filled with water) using a spinneret, and a porous hollow-fiber membrane was obtained due to phase separation in the coagulation tank.

[0203]As shown in FIG. 4, the spinning direction of membrane 34 was oriented to the horizontal, and in coagulation tank 30 (filled with water), 10 m was taken up in a straight line along the horizontal direction 36 from the discharge port of spinneret 31. Within about 1 m downstream therefrom, membrane 34 is raised up about 10 cm by roller 39, and cutting 35 is made by a cutting machine outside coagulation tank 30 and at cutting position 38 higher than position 37 of the discharge port of spinneret 31 which is ...

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Abstract

A polymer membrane for water treatment, characterized in comprising a hollow fiber membrane having a self-supporting design composed of the substantially single principal structural material, with an outer diameter of 3.6 mm to 10 mm and a ratio of outer diameter to thickness, SDR, of 3.6 to 34.

Description

TECHNICAL FIELD[0001]The present invention relates to a polymer membrane for water treatment a method for the manufacture of same, and a water treatment method.BACKGROUND ART[0002]Conventionally, polymer membranes for water treatment are used for purifying water, for example, for removing turbidity from river water and groundwater, clarification of industrial water, treatment of wastewater and sewage, and as a pretreatment for seawater desalination, and the like.[0003]Usually, such polymer membranes for water treatment are used as separation membranes in water treatment devices that utilize porous hollow fiber membranes formed from various polymer materials such as, for example, polystyrene (PS), poly(vinylidene fluoride) (PVDF), polyethylene (PE), cellulose acetate (CA), polyacrylonitrile (PAN), poly(vinyl alcohol) (PVA), polyimide (PI), and the like. In particular, polysulfone resins are frequently used due to their superior mechanical and chemical properties such as heat resistan...

Claims

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Application Information

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IPC IPC(8): B01D67/00C08F114/06B26D3/00C02F1/00B01D69/08
CPCB01D61/145B01D69/02Y10T29/49B01D71/30C02F3/1268B01D69/08B29C48/0022Y02W10/10B01D67/0016B01D69/087B01D2325/04B01D2325/24B29L2031/755C02F1/444C02F3/1273
Inventor TAMAI, TOSHIHIROOYABU, NAOTAKATANIMURA, SAKIOSUGI, TAKASHIMATSUO, RYUICHI
Owner SEKISUI CHEM CO LTD
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