JP2002035553A - Hollow fiber membrane module, its production method and hollow fiber membrane module unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow fiber module in which the degradation of the filtering ability caused by clogging the opening end part of a hollow fiber membrane by a fixing resin is not generated, and to provide its production method and a hollow fiber module unit. SOLUTION: In the method for a hollow fiber membrane module, where at least one end part of a bundle of the hollow fiber membrane bundled with hollow fiber membranes 3 is inserted into the housing 2 through an inserting hole 8 of a hollow housing 2 and where the bundle of the hollow fiber membrane is fixed in the housing 2 by injecting a fixing resin 5 into the inserting hole 8, filaments 11 (a damming member) damming the fixing resin 5 is pre-fitted on the bundle of the hollow fiber membrane so that the filaments 11 may be positioned in a range from the opening end part 12 of the hollow fiber membranes 3 to the opening part 13 of the inserting hole 8 of the housing 2 when the bundle of the hollow fiber membrane is inserted into the housing 2 through the inserting hole 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hollow fiber membrane module for filtering a liquid, a hollow fiber membrane module unit using the same, and a method for manufacturing a hollow fiber membrane module.
More particularly, the present invention relates to a hollow fiber membrane module suitable for filtering a liquid having high turbidity (particularly due to organic pollutants), a hollow fiber membrane module unit using the same, and a method for manufacturing a hollow fiber membrane module.

[0002]

2. Description of the Related Art Conventionally, hollow fiber membrane modules have been used in many applications such as production of sterile water, drinking water, highly pure water, and purification of air. In addition to these applications, in recent years, highly polluting water has been used in secondary and tertiary treatments in sewage treatment plants, solid-liquid separation in septic tanks, solid-liquid separation of SS (suspended substances) in industrial wastewater, and the like. It is used for processing purposes.

[0003] A hollow fiber membrane module suitably used for high-polluting water filtration is disclosed in JP-A-5-261253.
JP-A-6-342, JP-A-6-340, etc., accommodate the end of a sheet-like hollow fiber membrane bundle inside a rectangular housing and apply a fixing resin. There has been proposed a hollow fiber membrane module that is fixed by using the same. In manufacturing these hollow fiber membrane modules, a fixing resin is injected into the housing, and the end of the hollow fiber membrane bundle is fixed with the fixing resin, and then the fixing is performed so that the end of the hollow fiber membrane is opened. This is performed by cutting a part of the resin.

[0004] Further, as a manufacturing method which does not require a step of cutting a part of the fixing resin, a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled is formed on a side wall of a housing. Insert into a relatively narrow slit-shaped insertion hole,
A method of injecting a liquid resin into the insertion hole to fix the hollow fiber membrane bundle to the housing is known. In such a production method, the hollow fiber membrane module obtained and the hollow fiber membrane module unit using the module are prevented by preventing the opening end of the hollow fiber membrane from being blocked by the inflow of the fixing resin into the housing. It is possible to exhibit the filtration performance of

[0005]

However, in the above-described method for manufacturing a hollow fiber membrane module, the opening of the hollow fiber membrane caused by the fixing resin flowing into the inside of the housing and reaching the end of the hollow fiber membrane. No measures have been taken to actively prevent end clogging. Therefore, when the fixing resin flows into the housing and closes the open end of the hollow fiber membrane, the filtration performance of the hollow fiber membrane module may be reduced.

Accordingly, an object of the present invention is to provide a hollow fiber membrane module in which the opening end of the hollow fiber membrane is not blocked by the fixing resin and the filtration performance is not reduced, and even if the fixing resin flows into the housing. An object of the present invention is to provide a method for manufacturing a hollow fiber membrane module that does not block the open end of the hollow fiber membrane, and a hollow fiber membrane module unit using the hollow fiber membrane module.

[0007]

A hollow fiber membrane module according to the present invention comprises: a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled;
Having a hollow housing, the hollow fiber membrane bundle is fixed to the housing by a fixing resin in a state where at least one end thereof is inserted into the hollow portion in the housing,
A damming member for damping the fixing resin is provided on the hollow fiber membrane bundle located in the hollow portion in the housing. Further, it is desirable that the damming member is a thread that restrains each hollow fiber membrane of the hollow fiber membrane bundle.

In the method for manufacturing a plurality of hollow fiber membrane modules according to the present invention, at least one end of the hollow fiber membrane bundle in which the hollow fiber membranes are bundled is inserted into the housing through the insertion hole of the hollow housing. Then, in the manufacturing method of the hollow fiber membrane module for fixing the hollow fiber membrane bundle to the housing by injecting the fixing resin into the insertion hole of the housing, a damming member for damping the fixing resin is provided by connecting the hollow fiber membrane bundle to the housing. The hollow fiber membrane bundle is provided in advance so that the damming member is located between the opening end of the hollow fiber membrane and the opening of the insertion hole of the housing when inserted into the housing from the insertion hole. I do. Further, it is desirable that the damming member is a thread that restrains each hollow fiber membrane of the hollow fiber membrane bundle.

A hollow fiber membrane module unit according to the present invention comprises a plurality of hollow fiber membrane modules according to the present invention and a water collecting header having a water collecting passage for guiding a filtrate therein. Are connected to and fixed to the water collecting header so that the inside of the housing of the hollow fiber membrane module and the water collecting passage inside the water collecting header communicate with each other.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a hollow fiber membrane module, a method for producing the same, and a hollow fiber membrane module unit according to the present invention will be described in detail. FIG. 1 is a perspective view showing an example of the hollow fiber membrane module of the present invention, and FIG. 2 and FIG.
FIG. 2 is a sectional view of a fixed portion of a hollow fiber membrane bundle in the hollow fiber membrane module of FIG. This hollow fiber membrane module 1
A hollow fiber membrane bundle 4 in which a housing 2 and a plurality of hollow fiber membranes 3 are bundled in a sheet shape by a thread 11 (a damming member).
And a hollow fiber membrane bundle 4
Are fixed to the housing 2 by the fixing resin 5 with both ends inserted into the housing 2.

The housing 2 is a U-shaped cylindrical body having an internal passage 6 (hollow portion) formed therein. That is, by forming the housing 2 into such a cylindrical shape having a U-shaped cross section, when a plurality of hollow fiber membrane modules 1 are laminated to form a unit, the distance between the housings 2 is kept constant within an appropriate range. It is possible to increase the integration rate. The shape of the housing in the present invention is not limited to the illustrated example as long as it has the same performance.

At least one end of the housing 2 is provided with a connection port 7 communicating with the internal passage 6 and opening to the outside. A slit-shaped insertion hole 8 serving as an insertion port for accommodating the end of the hollow fiber membrane bundle 4 in the internal passage 6 is formed on the side surface of the housing 2 so as to surround the insertion hole 8. A weir 9 for preventing dripping of the fixing resin 5 is formed integrally with the housing 2. The portion surrounded by the weir 9 is a resin injection portion 10 for injecting the fixing resin 5.

The material of the housing 2 may be any material having mechanical strength and durability. For example, polycarbonate, polysulfone, polyolefin, PV
C (polyvinyl chloride), acrylic resin, ABS resin, modified PPE (polyphenylene ether) and the like can be used. If incineration is required after use, it is preferable to use a hydrocarbon-based resin such as polyolefin that can be completely burned without emitting toxic gas by combustion.

The height of the weir 9 of the housing 2 is set so that the injected fixing resin 5 can satisfy the pressure resistance required for the hollow fiber membrane module 1 and the stability of the fixing portion of the hollow fiber membrane bundle 4. The range is not particularly limited as long as it can be formed. For example, the range is 1 to 50 mm.

The width of the slit of the insertion hole 8 provided in the housing 2 is such that the hollow fiber membrane bundle 4 can be inserted from the outside of the housing 2, and the hollow fiber membrane 3 is pressed with such a pressing force that the hollow fiber membrane 3 is not crushed. It is desirable for the width to be able to hold. Insertion hole 8
The optimum slit width varies depending on the outer diameter of the hollow fiber membrane 3 to be used, and is not particularly limited.
It is in the range of 0.3 to 5 mm.

Various materials can be used as the hollow fiber membrane 3, such as cellulose, polyolefin, polyvinyl alcohol, and PMMA (polymethyl methacrylate).
Hollow fiber membranes made of various materials such as polystyrene and polysulfone can be used. Above all, it is preferable to use a hollow fiber membrane made of a material having high elongation such as polyethylene. In addition, as long as it is a hollow fiber membrane that can be used as a filtration membrane, its pore diameter, porosity, film thickness, outer diameter, and the like are not particularly limited. For example, the outer diameter is 20 to 2000 μm, and the pore diameter is 20 to 2000 μm. Is 0.01 to 1 μm, the porosity is 20 to 90%, and the film thickness is 5
It is preferable that these are appropriately selected depending on the application.

The hollow fiber membrane bundle 4 is preferably one in which the hollow fiber membranes 3 are simply aligned, and a knitted fabric using the hollow fiber membranes 3 as wefts, or a plurality of such knitted fabrics is laminated. A hollow body is more preferable from the viewpoint of workability of the hollow fiber membrane module 1. The hollow fiber membrane bundle formed by laminating a plurality of knitted fabrics here may be in a form in which the knitted fabric is folded to an appropriate length without being cut. The number of layers of these knitted fabrics is preferably selected based on the thickness of the knitted fabric, that is, the thickness of the hollow fiber membranes 3 and the number of plied yarns of the hollow fiber membranes 3 when knitting the knitted fabric. A range of up to 5 sheets is preferred.

As shown in FIGS. 2 and 3, the yarn 11 has a predetermined position between the open end 12 of the hollow fiber membrane 3 and the opening 13 of the insertion hole 8 of the housing 2, that is, the hollow fiber. Each hollow fiber membrane 3 is subjected to chain stitching (chain knitting) at a position where the membrane bundle 4 is exposed to the internal passage 6 in the housing 2.
Is bound. The thread 11 is used to prevent the liquid fixing resin 5 injected into the insertion hole 8 from flowing to the open end 12 of the hollow fiber membrane 3 when the hollow fiber membrane module 1 is manufactured. Of the fixing resin 5. The thread 11 is preferably provided to be substantially parallel to the opening 13 of the insertion hole 8 in order to prevent uneven distribution of the fixing resin flowing into the housing.

In the illustrated example, a thread is used as the damping member for the fixing resin. In addition, a tape, a resin, a wax, or another material having an effect of damping a liquid resin can be used. Above all, it is preferable to use a yarn because it can also be used as a restraining yarn when forming the hollow fiber membrane bundle 4.

The types of fibers constituting the yarn 11 include:
Multifilament yarns or spun yarns made of water-resistant synthetic fibers such as polyester fibers can be used, and it is desirable to appropriately select them according to the use conditions and the like. The optimal number of yarns depends on the load such as vibration during the cleaning of the hollow fiber membrane and the like, and is not particularly limited, but is, for example, in the range of 2 to 5 yarns.

As the fixing resin 5, an epoxy resin, an unsaturated polyester resin, a polyurethane resin, a silicone-based filler, various hot melt resins, and the like can be used, and can be appropriately selected. Also, the viscosity of the liquid fixing resin 5 before fixing is not particularly limited, but a predetermined amount remains in the resin injection portion 10 of the housing 2.
The range in which the impregnation between the hollow fiber membranes is favorable is 500 to 5
000 mPa · s is preferable, and 2000 is more preferable.
3,000 mPa · s.

The fixing resin 5 has a narrow insertion hole 8,
By being formed in the resin injection portion 10 having a wide width, the cross section has a convex shape. By making the cross section of the fixing resin 5 into such a convex shape, it is possible to prevent the occurrence of trauma due to the hollow fiber membrane 3 coming into contact with the housing 2.

In such a hollow fiber membrane module 1, the hollow fiber membrane bundle 4 located in the internal passage 6 in the housing 2
Since the thread 11 for blocking the fixing resin 5 is provided, the liquid fixing resin 5 reaches the open end 12 of the hollow fiber membrane 3 when the hollow fiber membrane module 1 is manufactured. Therefore, the opening end 12 of the hollow fiber membrane 3 is not closed by the fixing resin 5 and the filtration performance is not reduced.

Next, a method for manufacturing the hollow fiber membrane module 1 will be described. First, a plurality of hollow fiber membranes 3 are
The hollow fiber membrane bundle 4 is manufactured by bundling the sheet into a sheet shape using a damming member. At this time, when the hollow fiber membrane bundle 4 is inserted into the insertion hole 8 of the housing 2, the yarn 11 is located between the opening end 12 of the hollow fiber membrane 3 and the opening 13 of the insertion hole 8 of the housing 2. The hollow fiber membrane bundle 4 is provided so as to be substantially parallel to the opening end 12. Also,
The end of each hollow fiber membrane 3 constituting the hollow fiber membrane bundle 4 is cut in advance and opened.

The end of the hollow fiber membrane bundle 4 from which the end of the hollow fiber membrane 3 is cut is inserted into the housing 2 through the insertion hole 8 of the housing 2, and the open end 12 of the hollow fiber membrane 3 is inserted into the housing 2. Insert so that it is located in road 6. Here, when it is difficult to insert the hollow fiber membrane bundle 4 where the slit width of the insertion hole 8 is narrow, a means for expanding the insertion hole 8 at the time of insertion may be used together.

Next, while the open state of the end of the hollow fiber membrane 3 is maintained, the liquid fixing resin 5 is filled from the outside of the housing 2 into the insertion hole 8 and the resin injection part 10 in the vicinity thereof.
This is solidified and the hollow fiber membrane bundle 4 is fixed to the housing 2 to obtain the hollow fiber membrane module 1.

According to such a method for manufacturing the hollow fiber membrane module 1, when the hollow fiber membrane bundle 4 is inserted into the insertion hole 8 of the housing 2, the thread 11 for blocking the fixing resin 5 is inserted into the hollow fiber membrane module. 3 is provided in advance in the hollow fiber membrane bundle 4 so that the thread 11 is located between the opening end 12 of the housing 3 and the opening 13 of the insertion hole 8 of the housing 2. 2, the fixing resin 5 does not reach the open end 12 of the hollow fiber membrane 3. Therefore, the open end 12 of the hollow fiber membrane 3 is not closed by the fixing resin 5, and the filtration performance of the obtained hollow fiber membrane module 1 is not reduced.

FIG. 4 shows an example of the hollow fiber membrane module unit of the present invention. The hollow fiber membrane module unit 20 is formed by arranging a plurality of the hollow fiber membrane modules 1 described above and connecting these housings 2 by a water collecting header 21 to be integrated.

FIG. 5 shows an example of the water collecting header 21 of the hollow fiber membrane module unit 20. The water collecting header 21 has a plurality of continuous holes 22 for connecting to the connection ports 7 of the internal paths 6 of the hollow fiber membrane modules 1, 1,..., And has a water collecting path 23 through which filtrate flows. Are connected to a plurality of hollow fiber membrane modules 1, 1... At their continuous holes 22 and are fixedly integrated. In addition, the water collecting channel 23 is a water collecting header 21.
And connected to a water suction pump (not shown). The shape of the water collecting header 21 is preferably a manifold type in which a plurality of hollow fiber membrane modules 1 can be easily connected and fixed together, but the filtrate can be taken out from the hollow fiber membrane modules 1, 1,. There is no particular limitation as long as it has a structure.

The hollow fiber membrane module unit 20 shown in FIG. 4 is formed by integrating one end of the housing 2 of each hollow fiber membrane module 1, 1,. May be fixed by the water collecting header 21. In such a hollow fiber membrane module unit 20, a plurality of the hollow fiber membrane modules 1 described above are arranged, stacked and integrated by the water collecting header 21, so that the integration rate can be designed to be high and The hollow fiber membrane module can be easily replaced.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Example 1 A hollow fiber membrane module as shown in FIG. 1 was produced. The method for manufacturing the hollow fiber membrane module is as follows. First, hollow fiber membranes are arranged at a rate of 96 fibers per inch, and a hollow fiber membrane bundle integrated by a restraining thread as a damming member is prepared at a position 2 mm from the opening end of each hollow fiber membrane. did. The end of the hollow fiber membrane used was previously opened. The hollow fiber membrane used was
It is a polyethylene hollow fiber membrane (fractionation performance: 0.1 μm, outer diameter: 410 μm) manufactured by Mitsubishi Rayon Co., Ltd. The restraining yarn is a polyester yarn (150 denier, 7
5 filaments).

The hollow fiber membrane bundle was prepared by setting the slit width to 1 mm,
It was inserted into the housing through an insertion hole of a slit pipe (housing) having a total length of 600 mm. At this time, the hollow fiber membrane bundle was inserted so that the length of the hollow fiber membrane from the opening end of the hollow fiber membrane to the opening of the insertion hole was 10 mm. Then, both ends of the slit pipe were sealed with a cap-like material while one of them was made water-permeable. Next, a liquid fixing resin (two-component curable urethane resin) was injected into the insertion hole and the resin injection portion therearound so as to have a height of 5 mm to obtain a hollow fiber membrane module. After preparing 50 samples, the housing was cut along the longitudinal direction, and the state of the open end of the hollow fiber membrane was confirmed. There was no sample in which the fixing resin reached the open end of the hollow fiber membrane.

(Comparative Example 1) Fifty hollow fiber membrane module samples were obtained in the same manner as in Example 1 except that no damming member was provided in the hollow fiber membrane bundle. In the same manner, the state of the open end of the hollow fiber membrane was confirmed. There were 16 out of 50 samples in which the fixing resin reached the open end of the hollow fiber membrane. With respect to these 16 samples, the open end of the hollow fiber membrane was connected to an optical microscope manufactured by Nikon Corporation (SMZ-
Observation at 2T) confirmed that the seam end of the hollow fiber membrane was blocked by the fixing resin in all samples.

[0034]

As described above, in the hollow fiber membrane module of the present invention, since the hollow fiber membrane bundle located in the hollow portion in the housing is provided with the damming member for damping the fixing resin, The opening end of the hollow fiber membrane is not closed by the fixing resin, and the filtration performance is not reduced. Further, if the damming member is a thread that restrains each hollow fiber membrane of the hollow fiber membrane bundle, it can also be used as a restraining thread when forming the hollow fiber membrane bundle.

In the method for manufacturing a plurality of hollow fiber membrane modules according to the present invention, at least one end of the hollow fiber membrane bundle in which the hollow fiber membranes are bundled is inserted into the housing from the insertion hole of the hollow housing. Then, in the manufacturing method of the hollow fiber membrane module for fixing the hollow fiber membrane bundle to the housing by injecting the fixing resin into the insertion hole of the housing, a damming member for damping the fixing resin is provided by connecting the hollow fiber membrane bundle to the housing. Since it is provided in advance in the hollow fiber membrane bundle so that the damming member is located between the opening end of the hollow fiber membrane and the opening of the insertion hole of the housing when inserted into the housing from the insertion hole, it is fixed. Even if the resin for use flows into the housing, the opening end of the hollow fiber membrane is not closed.

The hollow fiber membrane module unit of the present invention comprises a plurality of hollow fiber membrane modules of the present invention and a water collecting header having a water collecting passage for guiding a filtrate therein. However, since it is connected and fixed to the water collection header so that the inside of the housing of the hollow fiber membrane module and the water collection passage inside the water collection header communicate, it has excellent filtration performance and can be designed with a high integration rate. ,
The hollow fiber membrane module can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a hollow fiber membrane module of the present invention.

FIG. 2 is a sectional view of a hollow fiber membrane bundle fixing portion in the hollow fiber membrane module of FIG. 1;

FIG. 3 is a cross-sectional view of the hollow fiber membrane module of FIG. 2, taken along the line III-III.

FIG. 4 is a perspective view showing an example of a hollow fiber membrane module unit of the present invention.

FIG. 5 is a perspective view showing a water collecting header used in the hollow fiber membrane module unit of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane module 2 Housing 3 Hollow fiber membrane 4 Hollow fiber membrane bundle 5 Fixing resin 6 Internal path (hollow part) 8 Insertion hole 11 Thread (dam member) 12 Open end 13 Opening 20 Hollow fiber membrane module Unit 21 Water collecting header 23 Water collecting channel

Continued on the front page (72) Inventor Tetsuya Torigashi 4-160 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Mitsubishi Rayon Co., Ltd. Product Development Laboratory (72) Inventor Kenji Honjo 4-1-1 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture No. 60 Mitsubishi Rayon Co., Ltd. Product Development Laboratory F-term (reference) 4D006 GA02 GA41 HA12 JA27A JA27C JB02 MA01 PC02 PC65 PC73

Claims (5)

[Claims] 1. A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes bundled together and a hollow housing, wherein at least one end of the hollow fiber membrane bundle is inserted into the housing from an insertion hole of the housing. The hollow is characterized in that it is fixed to the housing by the fixing resin in the inserted state, and a blocking member for blocking the fixing resin is provided in the hollow fiber membrane bundle located in the hollow portion in the housing. Thread membrane module. 2. The method according to claim 1, wherein the damming member is a thread for restraining each hollow fiber membrane of the hollow fiber membrane bundle.
The hollow fiber membrane module according to the above. 3. At least one end of a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled is inserted into the housing through an insertion hole of the hollow housing, and a fixing resin is injected into the insertion hole of the housing. A hollow fiber membrane module for fixing the hollow fiber membrane bundle to the housing by inserting the hollow fiber membrane bundle into the housing through the insertion hole of the housing. A method for manufacturing a hollow fiber membrane module, wherein a damming member is provided in advance in a hollow fiber membrane bundle so as to be located between an opening end of the membrane and an opening of an insertion hole of a housing. 4. The block member according to claim 3, wherein the damming member is a thread for restraining each hollow fiber membrane of the hollow fiber membrane bundle.
A method for producing the hollow fiber membrane module according to the above. 5. A hollow fiber membrane module comprising: a plurality of the hollow fiber membrane modules according to claim 1; and a water collecting header having a water collecting passage for introducing a filtrate into the hollow fiber membrane module. A hollow fiber membrane module unit, which is connected to and fixed to a water collecting header such that the inside of the housing of the membrane module and the water collecting passage inside the water collecting header communicate with each other.