JP4498557B2 - Hollow fiber membrane module, manufacturing method thereof, and hollow fiber membrane module unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow fiber membrane module that performs liquid filtration, a hollow fiber membrane module unit using the hollow fiber membrane module, and a method for producing the hollow fiber membrane module. More specifically, the present invention relates to a highly pollutant liquid (particularly due to organic pollutants). The present invention relates to a hollow fiber membrane module that is suitable for filtering air, a hollow fiber membrane module unit using the same, and a method for producing the hollow fiber membrane module.
[0002]
[Prior art]
Conventionally, hollow fiber membrane modules have been used in many applications such as aseptic water, drinking water, production of highly pure water, and air purification. In addition to these applications, in recent years, highly polluted water such as secondary and tertiary treatment in sewage treatment plants, solid-liquid separation in septic tanks, solid-liquid separation of SS (suspended material) in industrial wastewater, etc. It is used for processing purposes.
[0003]
Examples of the hollow fiber membrane module suitably used for high-contamination water filtration include those disclosed in JP-A-5-261253, JP-A-6-342, JP-A-6-340, and the like. There has been proposed a hollow fiber membrane module in which an end portion of a sheet-like hollow fiber membrane bundle is accommodated in a rectangular housing and fixed using a fixing resin.
These hollow fiber membrane modules are manufactured by injecting a fixing resin into the housing, fixing the end of the hollow fiber membrane bundle with the fixing resin, and then fixing the end of the hollow fiber membrane so that it opens. This is done by cutting a part of the resin.
[0004]
Further, as a manufacturing method that does not require a step of cutting a part of the fixing resin, the end of the hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled is relatively wide formed on the side wall of the housing. Is inserted into a narrow slit-like insertion hole, and a liquid resin is injected into the insertion hole to fix the hollow fiber membrane bundle to the housing.
In such a manufacturing method, the hollow fiber membrane module obtained by preventing clogging of the open end of the hollow fiber membrane due to the inflow of the fixing resin into the housing, and the hollow fiber membrane module unit using the module are obtained. It becomes possible to express the filtration performance.
[0005]
[Problems to be solved by the invention]
However, in the manufacturing method of the hollow fiber membrane module described above, the blocking end of the hollow fiber membrane caused by the fixing resin flowing into the housing and reaching the end of the hollow fiber membrane is actively prevented. No measures have been taken. Therefore, when the fixing resin flows into the housing and closes the open end of the hollow fiber membrane, there is a possibility that the filtration performance of the hollow fiber membrane module is deteriorated.
[0006]
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 deteriorated, and even if the fixing resin flows into the housing, the hollow fiber membrane It is in providing the manufacturing method of the hollow fiber membrane module which does not obstruct | occlude the opening edge part of this, and the hollow fiber membrane module unit using this hollow fiber membrane module.
[0007]
[Means for Solving the Problems]
The hollow fiber membrane module of the present invention has a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled and a hollow housing, and at least one end of the hollow fiber membrane bundle is hollow in the housing. It is fixed to the housing by a fixing resin in a state of being inserted into the portion, and a damming member for damming the fixing resin is provided in the hollow fiber membrane bundle located in the hollow portion in the housing. To do.
Moreover, it is desirable that the damming member is a yarn that restrains each hollow fiber membrane of the hollow fiber membrane bundle.
[0008]
The method for producing a plurality of hollow fiber membrane modules of the present invention includes inserting at least one end of a hollow fiber membrane bundle in which hollow fiber membranes are bundled into a housing through an insertion hole of a hollow housing, In the manufacturing method of the hollow fiber membrane module in which the fixing resin is injected into the insertion hole of the hollow fiber membrane bundle and the hollow fiber membrane bundle is fixed to the housing, the damming member for damming the fixing resin is inserted into the hollow fiber membrane bundle from the insertion hole of the housing. The hollow fiber membrane bundle is preliminarily provided so that the damming member is positioned between the opening end of the hollow fiber membrane and the opening of the insertion hole of the housing when inserted into the housing.
Moreover, it is desirable that the damming member is a yarn that restrains each hollow fiber membrane of the hollow fiber membrane bundle.
[0009]
Further, the hollow fiber membrane module unit of the present invention comprises a plurality of the hollow fiber membrane modules of the present invention and a water collection header having a water collection channel for introducing filtrate into the hollow fiber membrane module. The yarn membrane module is connected and fixed to the water collection header so that the inside of the housing of the yarn membrane module and the water collection path inside the water collection header communicate with each other.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the hollow fiber membrane module, the manufacturing method thereof, and the hollow fiber membrane module unit of the present invention will be described in detail.
FIG. 1 is a perspective view showing an example of a hollow fiber membrane module of the present invention, and FIGS. 2 and 3 are cross-sectional views of a fixing portion of a hollow fiber membrane bundle in the hollow fiber membrane module of FIG.
This hollow fiber membrane module 1 includes a housing 2 and a hollow fiber membrane bundle 4 in which a plurality of hollow fiber membranes 3 are bundled in a sheet form by a thread 11 (damming member). The hollow fiber membrane bundle 4 is fixed to the housing 2 by the fixing resin 5 in a state where both ends thereof are inserted into the housing 2.
[0011]
The housing 2 is a cylindrical body having a U-shaped cross section in which an internal passage 6 (hollow portion) is formed. That is, the housing 2 having a U-shaped cross section has a constant distance between the housings 2 within a proper range when a plurality of hollow fiber membrane modules 1 are stacked to form a unit. 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.
[0012]
At least one end of the housing 2 is provided with a connection port 7 that communicates with the internal path 6 and opens to the outside.
In addition, a slit-like insertion hole 8 is formed on the side surface of the housing 2 and serves as an insertion port for accommodating the end of the hollow fiber membrane bundle 4 in the internal passage 6 so as to surround the periphery of the insertion hole 8. A weir 9 for preventing the fixing resin 5 from dripping is formed integrally with the housing 2. A portion surrounded by the weir 9 serves as a resin injection portion 10 for injecting the fixing resin 5.
[0013]
The housing 2 may be made of any material having mechanical strength and durability. For example, polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, modified PPE (polyphenylene ether), etc. Can be used. When an incineration treatment is required after use, it is preferable to use a hydrocarbon-based resin such as polyolefin that can be completely burned without emitting a toxic gas by combustion.
[0014]
The height of the weir 9 of the housing 2 is a range in which the fixing resin 5 to be injected can form a thickness that 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. There is no particular limitation, but it is, for example, in the range of 1 to 50 mm.
[0015]
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 can be held with a crimping force that does not crush the hollow fiber membrane 3. It is desirable that The optimum slit width of the insertion hole 8 naturally depends on the outer diameter of the hollow fiber membrane 3 to be used and is not particularly limited, but is, for example, in the range of 0.3 to 5 mm.
[0016]
Various hollow fiber membranes 3 can be used. For example, hollow fiber membranes made of various materials such as cellulose, polyolefin, polyvinyl alcohol, PMMA (polymethyl methacrylate), and polysulfone can be used. is there. Among these, 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, but for example, the outer diameter is 20 to 2000 μm, the pore diameter Is 0.01 to 1 μm, the porosity is 20 to 90%, and the film thickness is in the range of 5 to 300 μm, and these are preferably selected as appropriate according to the application.
[0017]
The hollow fiber membrane bundle 4 is preferably one in which the hollow fiber membranes 3 are simply arranged together, and is a knitted fabric using the hollow fiber membranes 3 as weft yarns, or a plurality of these knitted fabrics are laminated to form a laminate. Those are more preferable from the viewpoint of processability of the hollow fiber membrane module 1.
The hollow fiber membrane bundle obtained by laminating a plurality of knitted fabrics herein may be in a form in which the knitted fabrics are folded to an appropriate length without being cut. The number of layers of these knitted fabrics is preferably selected according to the thickness of the knitted fabric, that is, the thickness of the hollow fiber membrane 3 and the number of combined yarns of the hollow fiber membrane 3 when knitting the knitted fabric. A range of ˜5 is preferred.
[0018]
As shown in FIGS. 2 and 3, the yarn 11 has a predetermined position between the opening 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 membrane bundle 4. The hollow fiber membranes 3 are constrained by chain stitches (chain stitches) at the positions exposed to the internal path 6 in the housing 2. The yarn 11 is liquid so that the liquid fixing resin 5 injected into the insertion hole 8 does not flow to the opening end 12 of the hollow fiber membrane 3 when the hollow fiber membrane module 1 is manufactured. The fixing resin 5 is dammed up. This thread 11 is preferably provided so as to be substantially parallel to the opening 13 of the insertion hole 8 in terms of preventing uneven distribution of the fixing resin flowing into the housing.
[0019]
In the illustrated example, the yarn is used as the fixing resin damming member, but in addition to this, those having the effect of damaging liquid resin such as tape, resin, wax, etc. can be used. Among them, it is preferable to use a yarn because it can be used as a constraining yarn when forming the hollow fiber membrane bundle 4.
[0020]
As the type of fiber constituting the yarn 11, multifilament yarn or spun yarn made of synthetic fiber having water resistance such as polyester fiber can be used, and it is desirable to select it appropriately depending on the use conditions. The optimum number of yarns varies depending on the load such as vibration during washing of the hollow fiber membrane, and is not particularly limited, but is within the range of 2 to 5, for example.
[0021]
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. Further, the viscosity of the liquid fixing resin 5 before fixing is not particularly limited, but the predetermined amount remains in the resin injection portion 10 of the housing 2 and the range of good impregnation between the hollow fiber membranes is 500 to 5000 mPa. -S is preferable, More preferably, it is the range of 2000-3000 mPa * s.
[0022]
The fixing resin 5 is formed in the narrow insertion hole 8 and the wide resin injecting portion 10, so that the cross section is convex. 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.
[0023]
In such a hollow fiber membrane module 1, the hollow fiber membrane bundle 4 positioned in the internal path 6 in the housing 2 is provided with the thread 11 for damming the fixing resin 5. During the manufacture of the module 1, the liquid fixing resin 5 does not reach the opening end 12 of the hollow fiber membrane 3, and the opening end 12 of the hollow fiber membrane 3 is blocked by the fixing resin 5 and filtered. The performance is not degraded.
[0024]
Next, the manufacturing method of the hollow fiber membrane module 1 is demonstrated.
First, the hollow fiber membrane bundle 4 is produced by bundling a plurality of hollow fiber membranes 3 into a sheet shape by the yarn 11 (damming member). At this time, the yarn 11 is positioned between the opening end 12 of the hollow fiber membrane 3 and the opening 13 of the insertion hole 8 of the housing 2 when the hollow fiber membrane bundle 4 is inserted into 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 portion 12.
Moreover, the edge part of each hollow fiber membrane 3 which comprises the hollow fiber membrane bundle 4 is cut and opened beforehand.
[0025]
The end of the hollow fiber membrane bundle 4 with the end of the hollow fiber membrane 3 cut is inserted into the housing 2 from the insertion hole 8 of the housing 2, and the open end 12 of the hollow fiber membrane 3 is connected to the internal path 6 of the housing 2. Insert to position. 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 in combination.
[0026]
Next, while maintaining the open state of the end portion of the hollow fiber membrane 3, the liquid fixing resin 5 is filled from the outside of the housing 2 into the insertion hole 8 and the resin injection portion 10 therearound, and is solidified, The hollow fiber membrane bundle 4 is fixed to the housing 2, and the hollow fiber membrane module 1 is obtained.
[0027]
According to such a manufacturing method of the hollow fiber membrane module 1, the thread 11 for damming the fixing resin 5 is opened when the hollow fiber membrane bundle 4 is inserted into the insertion hole 8 of the housing 2. Since the hollow fiber membrane bundle 4 is provided in advance so that the thread 11 is located between the end 12 and the opening 13 of the insertion hole 8 of the housing 2, the liquid fixing resin 5 is placed inside the housing 2. Even if it flows in, 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 blocked with the fixing resin 5, and the filtration performance of the resulting hollow fiber membrane module 1 is not lowered.
[0028]
FIG. 4 shows an example of the hollow fiber membrane module unit of the present invention. The hollow fiber membrane module unit 20 includes a plurality of the hollow fiber membrane modules 1 described above, and these housings 2 are connected by a water collection header 21 to be integrated.
[0029]
FIG. 5 shows an example of the water collection header 21 of the hollow fiber membrane module unit 20. The water collection 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 collection path 23 through which the filtrate passes. It is in the shape of a rectangular tube, and is connected to a plurality of hollow fiber membrane modules 1, 1,... The water collecting channel 23 communicates with the outside of the water collecting header 21 and is connected to a water absorption pump (not shown).
As the shape of the water collection header 21, a manifold type that can easily connect and fix a plurality of hollow fiber membrane modules 1 together is preferable, but the filtrate can be taken out from the hollow fiber membrane modules 1, 1. If it is a structure, it will not specifically limit.
[0030]
Further, the hollow fiber membrane module unit 20 shown in FIG. 4 is obtained by integrating one end portion of the housing 2 of each hollow fiber membrane module 1, 1. May be fixed by the water collection header 21.
In such a hollow fiber membrane module unit 20, a plurality of the above-described hollow fiber membrane modules 1 are arranged, stacked and integrated by the water collection header 21, so that the integration rate can be designed high. The hollow fiber membrane module can be easily exchanged.
[0031]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
Example 1
A hollow fiber membrane module as shown in FIG. 1 was produced.
The manufacturing method of the hollow fiber membrane module is as follows.
First, hollow fiber membranes are arranged at a rate of 96 pieces per inch, and a bundle of hollow fiber membranes is prepared at 2 mm from the open end of each hollow fiber membrane and integrated by a restraining yarn as a damming member. did. The end portion of the hollow fiber membrane used was previously opened. The hollow fiber membrane used is a polyethylene hollow fiber membrane (fractionation performance 0.1 μm, outer diameter 410 μm) manufactured by Mitsubishi Rayon Co., Ltd., and the constraining yarn is a polyester yarn (150 denier, manufactured by Mitsubishi Rayon Co., Ltd.). 75 filaments).
[0032]
This hollow fiber membrane bundle was inserted into the housing through an insertion hole of a slit pipe (housing) having a slit width of 1 mm and 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. Next, both ends of the slit pipe were sealed with a cap-like material in a state where one side was allowed to pass water.
Next, a liquid fixing resin (two-component curable urethane resin) was injected into the insertion hole and the surrounding resin injection portion 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.
[0033]
(Comparative Example 1)
Samples of 50 hollow fiber membrane modules were obtained in the same manner as in Example 1 except that the damming member was not provided in the hollow fiber membrane bundle.
Similarly, the state of the open end of the hollow fiber membrane was confirmed. There were 16 samples out of 50 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 observed with a Nikon optical microscope (SMZ-2T). Was confirmed.
[0034]
【The invention's effect】
As described above, in the hollow fiber membrane module of the present invention, the hollow fiber membrane bundle located in the hollow portion in the housing is provided with the damming member for damming the fixing resin. The end portion is not blocked by the fixing resin, and the filtration performance is not deteriorated.
Further, if the damming member is a yarn that restrains each hollow fiber membrane of the hollow fiber membrane bundle, it can also be used as a restraining yarn when forming the hollow fiber membrane bundle.
[0035]
The method for producing a plurality of hollow fiber membrane modules of the present invention includes inserting at least one end of a hollow fiber membrane bundle in which hollow fiber membranes are bundled into a housing through an insertion hole of a hollow housing, In the manufacturing method of the hollow fiber membrane module in which the fixing resin is injected into the insertion hole of the hollow fiber membrane bundle and the hollow fiber membrane bundle is fixed to the housing, the damming member for damming the fixing resin is inserted into the hollow fiber membrane bundle from the insertion hole of 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. Even if it flows into the housing, the open end of the hollow fiber membrane is not blocked.
[0036]
Further, the hollow fiber membrane module unit of the present invention comprises a plurality of the hollow fiber membrane modules of the present invention and a water collection header having a water collection channel for introducing filtrate into the hollow fiber membrane module. It is connected and fixed to the water collection header so that the inside of the housing of the yarn membrane module and the water collection channel inside the water collection header communicate with each other. The hollow fiber membrane module can be exchanged.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a hollow fiber membrane module of the present invention.
2 is a cross-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.
5 is a perspective view showing a water collection header used in the hollow fiber membrane module unit of FIG. 4. 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 channel (hollow part)
8 Insertion hole 11 Thread (damming member)
12 Opening end 13 Opening 20 Hollow fiber membrane module unit 21 Water collecting header 23 Water collecting channel

Claims (5)

A hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled, and 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 housing from the insertion hole of the housing,
A hollow fiber membrane module, wherein a damming member for damming a fixing resin is provided in a hollow fiber membrane bundle located in a hollow portion in a housing. The hollow fiber membrane module according to claim 1, wherein the damming member is a yarn that restrains each hollow fiber membrane of the hollow fiber membrane bundle. 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 from the insertion hole of the hollow housing, and a fixing resin is injected into the insertion hole of the housing to hollow the housing. In the manufacturing method of the hollow fiber membrane module for fixing the yarn membrane bundle,
A damming member for damming the fixing resin, a damming member between the opening end of the hollow fiber membrane and the opening of the housing insertion hole when the hollow fiber membrane bundle is inserted into the housing from the housing insertion hole. A method for producing a hollow fiber membrane module, wherein the hollow fiber membrane bundle is provided in advance such that the hollow fiber membrane bundle is positioned. The method for producing a hollow fiber membrane module according to claim 3, wherein the damming member is a yarn that restrains each hollow fiber membrane of the hollow fiber membrane bundle. A plurality of the hollow fiber membrane modules according to claim 1 or 2, and a water collection header having a water collection channel for guiding the filtrate therein,
A hollow fiber membrane module unit, wherein the hollow fiber membrane module is connected and fixed to a water collection header so that the inside of the housing of the hollow fiber membrane module and the water collection path inside the water collection header communicate with each other.

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