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Hollow-fiber membrane module, process for producing hollow-fiber membrane module, and hollow-fiber membrane unit equipped with hollow-fiber membrane module

A manufacturing method and technology of fiber membranes, applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problem of decreased permeation rate of treated water, insufficient physical cleaning of hollow fiber membranes, decreased cleaning effect of air diffuser, etc. question

Active Publication Date: 2015-02-04
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the membrane area per unit volume is increased too much, the hollow fiber membrane will be too dense, and the cleaning effect of the aeration of the diffuser will decrease.
As a result, the physical cleaning of the hollow fiber membrane cannot be sufficiently performed, and as a result, the hollow fiber membrane is clogged and the permeation rate of the water to be treated is reduced.
Therefore, there is a problem that the amount of treated water per unit volume cannot be increased simply by increasing the membrane area per unit volume.

Method used

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  • Hollow-fiber membrane module, process for producing hollow-fiber membrane module, and hollow-fiber membrane unit equipped with hollow-fiber membrane module
  • Hollow-fiber membrane module, process for producing hollow-fiber membrane module, and hollow-fiber membrane unit equipped with hollow-fiber membrane module
  • Hollow-fiber membrane module, process for producing hollow-fiber membrane module, and hollow-fiber membrane unit equipped with hollow-fiber membrane module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Prepare two hollow fiber membrane sheets, which are hollow fiber membranes made of 160 polyvinylidene fluorides with an effective length of 875 mm (the nominal pore diameter is 0.4 μm, the outer diameter is 2.8 mm, manufactured by Mitsubishi Rayon Corporation) Formed by merging threads in one direction. As the box, an ABS box with a thickness of 7.5 mm was prepared. In a state where two hollow fiber membrane sheets with open upper and lower ends are stacked, the upper and lower ends of the sheets are fixed to the respective boxes with fixing resin (casting resin) made of urethane resin. In the hollow fiber membrane module produced at this time, the ratio of the sum of the cross-sectional areas of the hollow fiber membranes to the area of ​​the horizontal cross section was 53%. Further, the hollow fiber membrane module was fabricated by fixing the hollow fiber membrane module up and down so that the hollow fiber membranes extended in the vertical direction, and arrangin...

Embodiment 2

[0153] Prepare two hollow fiber membrane sheets, which are hollow fiber membranes made of 160 polyvinylidene fluorides with an effective length of 875 mm (the nominal pore diameter is 0.4 μm, the outer diameter is 2.8 mm, manufactured by Mitsubishi Rayon Corporation) Formed by merging threads in one direction. As the box, an ABS box with a thickness of 7.5 mm was prepared. Also, a convex portion with a secondary height of 0.3 mm is formed on the inner wall of the box. In a state where two hollow fiber membrane sheets with open upper and lower ends are stacked, the upper and lower ends of the sheets are fixed to the respective boxes with fixing resin (casting resin) made of urethane resin. In the hollow fiber membrane module produced at this time, the ratio of the sum of the cross-sectional areas of the hollow fiber membranes to the area of ​​the horizontal cross section was 53%. Further, the hollow fiber membrane module was fabricated by fixing the hollow fiber membrane modu...

Embodiment 3

[0185] Two tanks having a divided structure with external dimensions of L340mm×W6mm×H50mm were prepared, and these were superimposed and welded to produce an ABS water collecting member of L340mm×W12mm×H50mm. An opening of L300 mmmm x W6 mm x 20 mm and a water collecting flow path of L300 mm x W6 mm x H20 mm corresponding to the opening are formed on the water collecting member. In addition, water inlets having an inner diameter of 6 mm in diameter are formed at both ends of the water collecting member. In addition, columnar bodies having a circular cross-section with an outer diameter of 6 mm in diameter are equally formed on the water collecting flow path, left, right, up and down. The water collecting part and the connection structure are welded together by solvent adhesive (Ethelon No.73). As the fixing resin of the hollow fiber membrane, polyurethane resin (4423 / 4426, Nippon Polyurethane) was used to fix the laminated body of the hollow fiber membrane sheet to the water ...

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Abstract

Provided are a hollow-fiber membrane unit in which the membranes are prevented from decreasing in permeation rate and the membrane area per unit volume has been rendered suitable and which can hence treat water in an increased rate and a hollow-fiber membrane module which is for use in such hollow-fiber membrane unit. The hollow-fiber membrane module comprises either a hollow-fiber membrane sheet composed of hollow-fiber membranes disposed in a sheet arrangement or a stack of such sheets and a box-shaped water collection member which holds the hollow-fiber membrane sheet or stack, wherein one surface of the water collection member has an opening that is filled with a fixing resin (potting resin) and is for fixing the hollow-fiber membrane sheet stack. The water collection member has a thickness of 20 mm or smaller along the out-of-plane direction of the hollow-fiber membrane sheet, and the proportion of the total area of the cross-sections of the hollow-fiber membranes in the one surface having the opening formed therein is at least 45%.

Description

technical field [0001] The invention relates to a hollow fiber membrane module, a manufacturing method of the hollow fiber membrane module and a hollow fiber membrane unit with the hollow fiber membrane module. Background technique [0002] Conventionally, there is known a hollow fiber membrane unit in which a plurality of hollow fiber membrane modules are arranged (for example, Patent Document 1). This hollow fiber membrane module is formed by stacking hollow fiber membrane sheets in the form of a sheet, and fixing the stack liquid-tightly to an elongated case using a fixing resin (casting resin). In addition, the ends of the hollow fiber membranes are open, and the hollow fiber membranes communicate with the internal space of the housing. [0003] This hollow fiber membrane module applies negative pressure to the tank, thereby attracting the treated water on the primary side (the treated water side) of the hollow fiber membrane to the inside of the hollow fiber membrane, ...

Claims

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Application Information

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IPC IPC(8): B01D63/02B01D63/00B01D63/04C02F1/44
CPCB01D63/043B01D2315/06C02F1/44B01D2313/125B01D63/026Y10T156/10B32B37/1284B32B37/18
Inventor 井手口诚笹川学中原祯仁上野敦靖田中利典赤川和美竹内雅人邹卓裔
Owner MITSUBISHI CHEM CORP
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