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Semipermeable membrane support for membrane bioreactor treatment

A technology for activated sludge and membrane separation, which is used in water/sludge/sewage treatment, semi-permeable membrane separation, biological water/sewage treatment, etc. and other problems, to achieve the effect of high bonding strength and excellent solvent resistance

Active Publication Date: 2021-02-12
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the supports for semipermeable membranes of Patent Documents 6, 7, and 8, when the coating liquid for forming a semipermeable membrane is coated on the support for semipermeable membranes, the core in the support for semipermeable membranes The sheath-type polyester composite fiber is eluted by the solvent of the coating liquid, and the strength of the support for the semipermeable membrane may decrease, and the coatability of the semipermeable membrane may decrease
In addition, the weight per unit area of ​​the support for the semipermeable membrane is 100g / m2, and the tube processing process and membrane coating of the support for the tubular semipermeable membrane in the tubular / tubular module Tube deformation occurs during the process, and a uniform film may not be formed
In addition, in the support body for a semipermeable membrane of Patent Document 8, even if the weight per unit area of ​​the support body for a semipermeable membrane is 100 g / m2 or more, due to the compounding of the core-sheath type polyester composite fiber The rate is high, so when the non-woven fabric of the base paper used as the support for the semipermeable membrane is thermally calendered, the sheath of the molten core-sheath polyester composite fiber is attached to the hot roll, and the metal that is gradually heated is sometimes contaminated. roll

Method used

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  • Semipermeable membrane support for membrane bioreactor treatment
  • Semipermeable membrane support for membrane bioreactor treatment
  • Semipermeable membrane support for membrane bioreactor treatment

Examples

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Embodiment

[0084] Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. It should be noted that, unless otherwise specified, the parts and percentages in the examples are by mass.

[0085] "Main Fiber"

[0086]

[0087] A stretched polyester fiber made of polyethylene terephthalate having a fiber diameter of 5 μm and a fiber length of 3 mm was used as the stretched PET fiber 1 .

[0088]

[0089] A stretched polyester fiber made of polyethylene terephthalate having a fiber diameter of 6 μm and a fiber length of 5 mm was used as the stretched PET fiber 2 .

[0090]

[0091] A stretched polyester fiber made of polyethylene terephthalate having a fiber diameter of 7 μm and a fiber length of 3 mm was used as the stretched PET fiber 3 .

[0092]

[0093] A stretched polyester fiber made of polyethylene terephthalate with a fiber diameter of 10 μm and a fiber length of 5 mm was used as...

Embodiment 39

[0327] In the support body for a semipermeable membrane of Example 39, the fiber diameter of the stretched polyester fiber in the coating surface layer is smaller than the fiber diameter of the stretched polyester fiber in the back layer, which is different from that of the stretched polyester fiber in the back layer. Compared with Example 64 in which the fiber diameter was equal to the fiber diameter of the stretched polyester fiber in the coating surface layer, it was superior in evaluation of semipermeable membrane applicability of the semipermeable membrane support and deformation of the tube.

[0328] In the supports for semipermeable membranes of Examples 39 and 65, the fiber diameter of the stretched polyester fiber in the coating surface layer is smaller than the fiber diameter of the stretched polyester fiber of the back layer, which is different from the stretched polyester fiber of the back layer. Compared with the support body for the semipermeable membrane of Examp...

Embodiment 66

[0329] The average fiber diameter of the stretched polyester fibers of the back layer in the support for the semipermeable membrane of Example 66 is 16 μm, which is larger than the fiber diameter of the stretched polyester fibers in the coating surface layer, but the back layer contains fibers Drawn polyester fibers with a diameter exceeding 30 μm. Compared with Example 65, the support body for a semipermeable membrane of Example 39 is less prone to semipermeable membrane print-through.

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Abstract

The present invention addresses the problem of providing a semipermeable membrane support for membrane bioreactor treatments that has excellent solvent resistance and is not susceptible to decreased strength when coated with a coating solution for forming a semipermeable membrane on the semipermeable membrane support. The semipermeable membrane support for membrane bioreactor treatments is a non-woven fabric containing main fibers and binder fibers, and is characterized in that stretched polyester fibers are included as the main fibers and core-sheath polyester composite fibers are included asthe binder fibers, the sheath portion therein being a crystalline copolymer polyester that has terephthalic acid as the dicarboxylic acid component, ethylene glycol and tetramethylene glycol as the diol component, and a melting point of 160-185 DEG C.

Description

technical field [0001] The present invention relates to a support body for a semipermeable membrane for membrane separation activated sludge treatment. Background technique [0002] Semipermeable membranes are widely used in the fields of seawater desalination, water purifiers, food concentration, waste water treatment, medical use represented by blood filtration, and ultrapure water production for semiconductor cleaning. The separation function layer of the semipermeable membrane is formed of porous resins such as cellulose-based resins, polysulfone-based resins, polyacrylonitrile-based resins, fluorine-based resins, and polyester-based resins. However, these porous resin monomers are poor in mechanical strength, so a "filter membrane" in the form of a composite in which a semipermeable membrane is provided on one side of a support for a semipermeable membrane including a fibrous base material such as a nonwoven fabric or a woven fabric is used. ". In the support body for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D63/06B01D63/08B01D69/12B01D71/48C02F3/12D04H1/541
CPCY02W10/10B01D71/48C02F3/1268D04H1/435D04H1/5412D04H1/55B01D63/10B01D67/00042B01D69/107B01D69/1071B01D69/1213
Inventor 吉田光男
Owner MITSUBISHI PAPER MILLS LTD