JP5030690B2 - Hollow fiber membrane module - Google Patents

Description

  The present invention relates to a hollow fiber membrane module and the like, and more particularly, to a hollow fiber membrane module used for filtering a liquid containing fine particles, suspended substances and the like.

  A hollow fiber membrane module used in a filtration device for filtering a liquid containing fine particles, suspended substances, etc. is at least one of a bundle of hollow fiber membranes in which hundreds to tens of thousands of hollow fiber membranes are bundled. The ends are bonded with resin.

  In the hollow fiber membrane module, after performing a certain amount of filtration, a cleaning operation is performed to remove deposits attached to the surface of the hollow fiber membrane in order to recover the filtration performance. As this cleaning operation, the hollow fiber membrane module is immersed in an immersion tank filled with raw water, air is introduced into the hollow fiber membrane bundle from the bottom of the hollow fiber membrane module, and the hollow fiber membrane vibrates in the gas-liquid mixed fluid. There is a method (air scrubbing) that peels off and removes deposits adhering to the outer surface of the hollow fiber membrane.

  As a hollow fiber membrane module, a large number of hollow fiber membranes are bonded and fixed so that the open end is sealed on one end side and the open end is opened on the other end side. There is known a hollow fiber membrane module (hollow fiber membrane cartridge) provided with a plurality of through-holes functioning as air supply ports and exfoliated volume discharge ports during a cleaning operation as a supply port (see Patent Document 1). .

  In this hollow fiber membrane module, during filtration, raw water is injected from the through-hole provided in the adhesive fixing part on one end side, and the hollow fiber membrane opened on the other end side where the open end of the hollow fiber membrane is open is provided. The hollow part is sucked and water filtered through the hollow fiber membrane (filtered water) is taken out. At the time of cleaning, gas is introduced between the hollow fiber membranes through the through-hole formed in the adhesive fixing portion, and deposits adhered to the outer surface of the hollow fiber membrane are removed, and air scrubbing is performed.

  On the other hand, a hollow fiber membrane module in which drainage is taken out from both ends has also been proposed (see Patent Document 2). In this hollow fiber membrane module, a large number of bundled hollow fiber membranes are bonded and fixed at both ends with both open ends open, and the one end side adhesive fixing portion is used as a raw water supply port during filtration and during cleaning. A plurality of passages functioning as air inlets for air scrubbing and outlets for suspended substances are provided.

Japanese Patent Laid-Open No. 2003-24751 JP-A-2005-34762

The conventional hollow fiber membrane module as described above has a configuration in which a through hole or a passage for introducing a gas for air scrubbing is provided in an adhesive fixing portion that bonds and fixes an end of the hollow fiber membrane.
However, since the scrubbing air introduction part such as the through hole is formed between the bundled hollow fiber membranes, it is formed directly on the adhesive fixing part as in Patent Document 1 or 2 above. In addition, even when the adhesive fixing portion is formed by penetrating a tube, it is difficult to accurately place the introduction portion of the scrubbing air at a desired position due to a displacement of the hollow fiber membranes during manufacturing. Has the problem.

  The present invention has been made to solve such a problem, and the scrubbing air introduction part is easily positioned at an accurate position with respect to the adhesive fixing part at the end for fixing the hollow fiber membrane bundle. An object of the present invention is to provide a hollow fiber membrane module that can be used.

According to the present invention,
A hollow fiber membrane module,
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes;
A fixing resin layer that fixes both ends of the hollow fiber membrane bundle integrally in a cartridge adapter with at least one end of the hollow fiber membrane being opened,
Disposed on one of the fixing resin layer, viewed write sends scrubbing gas in the hollow fiber membrane bundle, tip, the intersection of the city of multiplexed circles and radial lines, the intersections of the lattice, or the vertices positions of a large number of equilateral triangle A scrubbing pipe branched into a plurality of scrubbing pipes arranged to be either
Positioning means for positioning each of the scrubbing pipes with respect to the one fixing resin layer, one end connected to the inner peripheral surface of the cartridge adapter and the other end connected to the scrubbing pipe; Has
A hollow fiber membrane module is provided.

  According to such a configuration, since the scrubbing pipe, which is the introduction portion of the scrubbing air, is provided with positioning means for positioning with respect to the fixing resin layer that adheres and fixes the end of the hollow fiber membrane, the hollow fiber membrane The scrubbing tube can be surely placed at a desired position when the end of each is bonded and fixed with resin.

According to another preferred embodiment of the invention,
The fixing resin layer integrally fixes both ends of the hollow fiber membrane in a state where both ends of the hollow fiber membrane are opened.

  According to another preferred aspect of the present invention, the positioning means is a plate-like body.

According to another preferred embodiment of the invention,
The number of scrubbing tubes is 2 to 16 .

  According to the present invention, it is possible to provide a hollow fiber membrane module capable of easily positioning an introduction portion of scrubbing air at an accurate position with respect to an adhesive fixing portion at an end portion for fixing a hollow fiber membrane bundle. it can.

  Hereinafter, a configuration of a hollow fiber membrane cartridge according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic side view in which a part of a hollow fiber membrane module 1 according to a preferred embodiment of the present invention is broken. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a partially cutaway view along line III-III in FIG.

  As shown in FIG. 1, the hollow fiber membrane module 1 includes a large number of hollow fiber membranes 2 cut to a predetermined length. Each hollow fiber membrane 2 is bundled in a substantially cylindrical shape, and both ends thereof are fixed and integrated with each other by the adhesive fixing layers 4 and 6 so that both open ends of the hollow portion are opened, thereby forming a hollow fiber membrane bundle 8.

  As the hollow fiber membrane 2 used in the present embodiment, a generally known reverse osmosis membrane or ultrafiltration membrane having an inner diameter of 50 μm to 3000 μm and an inner / outer diameter ratio of 0.2 to 0.8. Those having a pore size such as a membrane, a microfiltration membrane, and a large pore membrane can be used, but preferably in the range of an ultrafiltration membrane, a microfiltration membrane, and a large pore membrane, in the range of 0.0005 to 5.0 μm. . The material of the hollow fiber membrane 2 is not particularly limited, and polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetheretherketone, polyetheretherketone, polyethylene, polypropylene, poly- Examples include 4-methylpentene, cellulose, cellulose acetate, polyvinylidene fluoride, polyethylene-tetrafluoroethylene copolymer, and polytetrafluoroethylene. These composite material films can also be used.

  At both ends of the hollow fiber membrane bundle 8, cartridge heads 14 and 16 are attached via cylindrical cartridge adapters 10 and 12, respectively. The cartridge heads 14 and 16 are cylindrical with large diameter portions 14a and 16a having an inner diameter substantially equal to the outer diameter of the cartridge adapters 10 and 12, and small diameter portions 14b and 16b having a smaller diameter than the large diameter portions 14a and 16a. It is a member.

  The materials of the cartridge adapters 10 and 12 and the cartridge heads 14 and 16 are not particularly limited, and may be the same or different, but thermoplastic resins and stainless steel are preferable.

  The diameters of the cartridge adapters 10 and 12 and the cartridge heads 14 and 16 are in the range of 20 mm to 500 mm, preferably 25 mm to 400 mm, more preferably 30 mm to 250 mm. The distance between the cartridge heads 14 and 16 is in the range of 200 mm to 3000 mm, preferably 300 mm to 2500 mm, more preferably 400 mm to 2200 mm.

  In the present embodiment, the cartridge adapters 10 and 12 and the cartridge heads 14 and 16 may be arbitrarily selected from cross-sectional shapes such as a polygon such as a triangle, a quadrangle, and a hexagon, a circle, an ellipse, a fan, a C-shape, or a star. However, from the viewpoint of cost reduction, a circular shape is preferable.

  The hollow fiber membrane bundle 8 is adhesively fixed to the cartridge heads 14 and 16 so that the adhesive fixing layers 4 and 6 are located on the front side of the end portions of the large diameter portions 14a and 16a of the cartridge heads 14 and 16. . That is, the open end of each hollow fiber membrane 2 of the hollow fiber membrane bundle 8 is open to the space in the large diameter portions 14a and 16a.

  Examples of the adhesive used in this embodiment include polymer materials such as epoxy resins, urethane resins, epoxy acrylate resins, and silicon resins. As a bonding method, a known method such as a centrifugal bonding method or a stationary bonding method is used. When it is desired to improve the effective shrinkage and strength of the adhesive, the adhesive may contain a fibrous material such as glass fiber or carbon fiber, or fine powder such as carbon black, alumina, or silica.

  Further, the outer peripheral surfaces of the adhesive fixing layers 4 and 6 of the hollow fiber membrane bundle 8, the cartridge adapters 10 and 12, and the cartridge heads 14 and 16 are connected to each other by an adhesive or the like so as to be in a fluid-tight state. With such a configuration, the hollow portion of each hollow fiber membrane 8 communicates with the internal space of the cartridge heads 14 and 16 at both ends.

  Each cartridge head 14, 16 is attached with a filtered treated water feed pipe 18 (only one is shown in FIG. 1). As shown in FIG. 1, in this embodiment, the lower filtered treated water feed pipe 18 is a T-shaped branch pipe 18. A scrubbing pipe 20 for supplying scrubbing air from a branch part 18a of the branch pipe 18 is inserted. The tip portion of the scrubbing pipe is branched into a plurality (six in this embodiment) of scrubbing tubes 22 in the adhesive fixing layer 6. The gap between the opening end of the branch portion 18a and the outer peripheral surface of the scrubbing pipe 20 is sealed with an adhesive 24.

  In this embodiment, the inner diameter of the scrubbing tube 22 is 1 to 40 mm, preferably 2 to 35 mm, particularly preferably 3 to 30 mm. The cross-sectional shape of the scrubbing tube 22 is not particularly limited, and may be a polygon such as a triangle, a quadrangle, or a hexagon, a circle, an ellipse, a fan, a C-shape, or a star.

  The number of scrubbing tubes 22 is appropriately set between 2 and 16 depending on the cross-sectional area of the hollow fiber membrane bundle 8 and the number of the hollow fiber membranes 2. From the viewpoint of cost and productivity, it is preferably 2 to 14, particularly preferably 2 to 10.

  The scrubbing tube 22 in the adhesive fixing layer 6 is uniformly distributed in the cross section of the adhesive fixing layer 6 such as an intersection of multiple circles and radial lines, an intersection of lattices, or apex positions of many equilateral triangles. It is preferable that the hollow fiber membrane is more uniformly washed. The material of the scrubbing tube 22 is preferably a thermoplastic resin, stainless steel, or aluminum steel.

  The hollow fiber membrane module 1 includes a fixing plate (positioning means) 26 that positions a plurality of scrubbing tubes 22 at predetermined positions in the adhesive fixing layer 6. As shown in FIG. 2, in this embodiment, one fixing plate 26 is provided for each of the six scrubbing tubes 22. Specifically, one end of the fixing plate 26 is connected to the inner peripheral surface of the cartridge adapter 12, and the other end positioned radially inward supports the scrubbing tube 22.

  One end of the fixing plate 26 is fixed to the scrubbing tube 22 by bonding or welding. Similarly, the other end of the fixing plate 26 is fixed to the inner peripheral surface of the cartridge adapter 12 by bonding or welding. Note that the fixing plate 26 is preferably disposed inward in the radial direction.

  In this embodiment, after fixing the cartridge adapter 12, the fixing plate 26, and the scrubbing tube 22 by bonding or welding, one end of the hollow fiber membrane bundle 8 is inserted into the cartridge adapter 12, and one end of the hollow fiber membrane bundle 8 is inserted. The resin fixing layer 6 is formed by injecting an adhesive into the cartridge adapter 12 and solidifying the adhesive.

  In the hollow fiber membrane module 1 of this embodiment, the hollow fiber membrane 2 is exposed over the entire length. In order to prevent the hollow fiber membrane 2 from being twisted or the hollow fiber membrane module 1 from being twisted, the cartridge adapters 10 and 12 may be connected by a protective cover or a protective rod. The protective cover is desirably opened to facilitate the scrubbing air discharge and the hollow fiber membrane module outer peripheral portion raw water discharge. Further, a protective cover or a protective rod may be bonded and fixed to the hollow fiber membrane bundle 8.

  The hollow fiber membrane module of this embodiment having such a configuration is immersed in raw water to be filtered at the time of use. The raw water is subjected to negative pressure filtration from the outside to the inside of the hollow fiber membrane 2 by suction from a suction pump (not shown) connected to the small diameter portions 14 b and 16 b of the cartridge heads 14 and 16. Further, the filtered water flows into the cartridge heads 14 and 16 from both end surfaces of the hollow fiber membrane bundle 8 where the open ends of the hollow fiber membranes 2 are opened, and the filtered treated water supply pipe 18 connected to the small diameter portions 14b and 16b ( (Only one is shown) and taken out (in the direction of arrow A).

  In addition, when the hollow fiber membrane 2 is backwashed with filtered water, suspended water (non-permeate) accumulated on the outer wall of the hollow fiber membrane 2 is supplied with filtered water from the filtered water feed pipe and backwashed. Remove.

  Further, when air scrubbing the hollow fiber membrane 2, the hollow fiber membrane module 1 is immersed in an immersion tank filled with raw water, and gas is passed through the scrubbing pipe 20 and the scrubbing tube 22 into the hollow fiber membrane bundle 8 in the direction of arrow B. Press fit. As the gas to be injected, air, nitrogen, carbon dioxide, oxygen, or the like can be used, but air is desirable from the viewpoint of economy. The injected gas stirs the water in each hollow fiber membrane bundle 8 and causes the hollow fiber membranes 2 to dance and vibrate to peel off the suspended substances adhering to the surface of each hollow fiber membrane 2. . After such air scrubbing, the above-described backwash operation is performed to flush away the separated suspended substances. The air scrubbing operation may be performed simultaneously with the backwash operation.

  According to the hollow fiber membrane module of the present embodiment having such a configuration, since the scrubbing tube 22 is supported and fixed by the fixing plate 26, the end portion of the hollow fiber membrane bundle 8 is bonded and fixed using resin. When the adhesive fixing layer 6 is formed, the scrubbing tube 22 is securely held at a predetermined position within the end portion of the hollow fiber membrane bundle 8.

  Moreover, since the edge part of the hollow fiber membrane module 1 is structurally reinforced by the fixing plate 26, the shape of the hollow fiber membrane module 1 is stabilized.

  Without being limited to the above-described embodiment of the present invention, various changes and modifications can be made within the scope of the technical idea described in the claims.

  Although the hollow fiber membrane module 1 of the said embodiment was the structure which the both ends of the hollow fiber membrane 2 opened, this invention is patent documents by which the one open end of a hollow fiber membrane is sealed by the adhesive fixing layer. The present invention can also be applied to a hollow fiber membrane module having the configuration as in FIG.

It is the typical side view which fractured | ruptured a part which shows the hollow fiber membrane module of preferable embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is the figure which fractured | ruptured a part along the III-III line of FIG.

Explanation of symbols

1: hollow fiber membrane module 2: hollow fiber membrane 4, 6: adhesive fixing layer 8: hollow fiber membrane bundle 10, 12: cartridge adapter 14, 16: cartridge head 18: branch pipe 20: scrubbing pipe 22: scrubbing pipe 26: Fixed plate (positioning means)

Claims (4)

A hollow fiber membrane module,
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes;
A fixing resin layer that fixes both ends of the hollow fiber membrane bundle integrally in a cartridge adapter with at least one end of the hollow fiber membrane being opened,
Disposed on one of the fixing resin layer, viewed write sends scrubbing gas in the hollow fiber membrane bundle, tip, the intersection of the city of multiplexed circles and radial lines, the intersections of the lattice, or the vertices positions of a large number of equilateral triangle A scrubbing pipe branched into a plurality of scrubbing pipes arranged to be either
Positioning means for positioning each of the scrubbing pipes with respect to the one fixing resin layer, one end connected to the inner peripheral surface of the cartridge adapter and the other end connected to the scrubbing pipe; Has
A hollow fiber membrane module characterized by the above. The fixing resin layer integrally fixes both ends of the hollow fiber membrane bundle in a state where both ends of the hollow fiber membrane are opened.
The hollow fiber membrane module according to claim 1. The positioning means is a plate-like body;
The hollow fiber membrane module according to claim 1 or 2. The number of scrubbing tubes is 2 to 16 ;
The hollow fiber membrane module of any one of Claim 1 thru | or 3.

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