JP2000084373A - Housing for hollow fiber membrane module and hollow fiber membrane module using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing for hollow fiber membrane module improved in the fixing strength of a hollow fiber membrane and the pressure resistance thereof, and a hollow fiber membrane module using the same. SOLUTION: The housing 11 for hollow fiber membrane module is formed by providing a hollow part 15 along the longitudinal direction inside of a housing body 12 with U-shaped cross section, a recessed part 13 along the longitudinal direction on the outer surface of the housing body 12 and a slit 14 opening to the hollow part 15 on the bottom surface 13b of the recessed part 13 and the hollow fiber membrane module is constituted by using the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for a hollow fiber membrane module (hereinafter abbreviated as "housing") and a hollow fiber membrane module using the same. It is suitable for filtering highly polluting liquids.

[0002]

2. Description of the Related Art Conventionally, hollow fiber membrane modules have been constructed using sterile water,
It has been widely used for relatively low polluting applications such as production of drinking water, highly pure water, and air purification. Furthermore, in recent years, in addition to these uses, it has been used for secondary and tertiary treatment in sewage treatment plants, solid-liquid separation in septic tanks, solid-liquid separation of suspended solids in industrial wastewater, and other treatments for highly polluting water. Is also being used. Hollow fiber membrane modules used in such applications are disclosed in, for example, JP-A-5-261253, JP-A-6-342, and JP-A-6-340.

The housing of these hollow fiber membrane modules has a rectangular column shape having a hollow part (water collecting part) inside, and a slit opening to the hollow part is formed on one side surface. For the hollow fiber membrane module using this housing, for example, a sheet-like aggregate in which a plurality of tubular hollow fiber membranes are arranged in parallel is used. That is, in this hollow fiber membrane module, the end of the hollow fiber membrane constituting the sheet-shaped assembly in the fiber axis direction is inserted into the slit, and this is fixed by the potting resin filled in the slit. It is configured. This hollow fiber membrane module can treat a relatively high-pollutant treatment liquid by assembling the hollow fiber membranes into a sheet and expanding the contact membrane area of the aggregate of the hollow fiber membranes with the treatment liquid. I can do it.

The hollow fiber membrane module is manufactured, for example, as follows. That is, a plate-like body constituting a fixing surface of the hollow fiber membrane of the housing is prepared, a slit is formed in the plate-like body, and a forming tool having a concave portion is formed on the back surface of the plate-like body, and the slit is formed in the concave portion. Install so that it is covered. Next, the end of the hollow fiber membrane in the fiber axis direction is inserted into the slit, and reaches the inside of the concave portion of the molding tool.
When the potting resin is filled into the recesses and the slits and cured, a projection projecting from the plate-like body is formed inside the recesses. Then, when this convex portion is cut at a boundary with the back surface of the plate-like body, the hollow fiber membrane is fixed to the slit, and the end of the hollow fiber membrane located in the convex portion in the fiber axis direction is cut. An opening can be formed on the back surface of the plate-like body. Next, the plate-like body and members constituting the other surface of the housing are assembled to obtain a hollow fiber membrane module.

However, in the above-described hollow fiber membrane module, the hollow fiber membrane is fixed by a potting resin filled in a narrow slit. For this reason, the fixing strength of the hollow fiber membrane was insufficient in some applications. Further, unless the depth of the slit is secured, the hollow fiber membrane cannot be fixed stably, so that the plate-like body constituting the fixing surface of the hollow fiber membrane of the housing has to be thickened. Furthermore, since the molding tool is used when fixing the hollow fiber membrane, the area of the fixing surface of the hollow fiber membrane has to be increased to some extent. As a result, there is a problem that the size of the entire housing becomes larger than the membrane area of the hollow fiber membrane. For this reason, when designing a unit in which a plurality of hollow fiber membrane modules are provided, the installation space for one hollow fiber membrane module becomes large, and the inconvenience that the lamination rate per unit volume (effective membrane area) is limited. there were.

As an improvement over such a problem, Japanese Patent Application Laid-Open No. Hei 10-57775 discloses FIGS. 6 (a) and 6 (b).
And a hollow fiber membrane module using the same. FIG. 6A is a cross-sectional view cut in a direction orthogonal to the length direction of the housing.
(B) is a plan view of the sheet-like aggregate of hollow fiber membranes fixed to the housing, as viewed from the membrane surface side.

In the figure, reference numeral 1 denotes a housing. The housing 1 has a pipe-shaped main body 2 having a hollow part (water collecting part) 2a therein, and the main body 2 is arranged along its length. A slit 3 opening to the hollow portion 2a and the outside
Is provided. Further, on both sides of the slit 3, two linear projections 4, 4 protruding from the outer surface of the main body 2.
Are provided in parallel with the slit 3. And
A slit 3 is formed on the bottom surface by the inner walls of these convex portions 4 and 4 and the outer surface of the main body 2 sandwiched between these convex portions 4 and 4.
Is formed. This housing 1
Is usually manufactured by using a commercially available existing pipe as the main body 2, forming a slit 3 in the pipe (main body 2), and fixing the convex portions 4, 4 to the outer surface of the main body 2 with an adhesive or the like. It was done.

On the other hand, the hollow fiber membrane 6 acting as a filtration membrane
Are arranged in parallel with each other, and are integrated by weft yarns 7 orthogonal to the fiber axis direction of these hollow fiber membranes 6.
A sheet-like aggregate 8 is configured. In this sheet-like aggregate 8, the end portions 6a in the fiber axis direction of the hollow fiber membranes 6 are formed.
Is open. Hereinafter, the end of the hollow fiber membrane 6 or the end of the sheet-shaped assembly 8 refers to the end 6a of the hollow fiber membrane 6 in the fiber axis direction. Then, the sheet-shaped aggregate 8 is inserted into the slit 3 of the housing 1 and the recessed portion 5 and the potting resin 5a filled in the slit 3 are positioned inside the hollow portion 2a. To form a hollow fiber membrane module 9.

The filtration using the hollow fiber membrane module 9 is performed, for example, as follows. That is, the hollow fiber membrane module 9 is installed in a processing tank filled with the processing liquid, an external water collecting pipe is connected to the hollow part 2a of the main body 2 of the housing 1, and the water collecting pipe is suctioned by a pump or the like. Connect to the means. Then, when this suction means is operated, the inside of the hollow fiber membrane 6 becomes negative pressure through the water collecting pipe and the hollow part 2a. Thereby, the external treatment liquid is filtered by the hollow fiber membrane 6, and the filtrate is collected from the end 6a of the hollow fiber membrane 6 into the hollow part 2a, and further collected from the water collecting pipe. When the solid substance in the treatment liquid adheres to the outer surface of the hollow fiber membrane 6 and the filtration performance of the hollow fiber membrane module 9 is reduced by such a filtration operation, for example, the operation is temporarily stopped. Then, a washing liquid is supplied from the water collecting pipe to fill the inside of the hollow fiber membrane 6 with the washing liquid, and so-called reverse washing is performed. At this time, since a solid substance is adsorbed on the outer surface of the hollow fiber membrane 6, pressure from the cleaning liquid is applied from the inside (secondary side) of the hollow fiber membrane 6.

In the housing 1 and the hollow fiber membrane module 9, the hollow fiber membrane 6 is filled with a potting resin 5 a in the recess 5 formed on the outer surface of the main body 2.
In order to fix the (sheet-like aggregate 8), the hollow fiber membrane 6 can be fixed while the open state of the end 6a is maintained. Therefore, the main body 2 can be composed of one member, and the fixing surface of the hollow fiber membrane 6 can be formed into a curved surface or the like, so that the degree of design freedom is relatively high. For this reason, the outer diameter (size) of the housing 1 can be reduced. Since the hollow fiber membrane 6 is fixed not only by the potting resin filled in the slit 3 but also by a relatively large volume of potting resin 5a filled in the recess 5, the above-mentioned rectangular housing is used. Thereby, mechanical strength can be improved.

[0011]

However, in this hollow fiber membrane module 9, as the main body 2, as described above, a commercially available round pipe was usually used. For this reason, in the cross section of the main body 2, the length of the hollow fiber membrane 6 in the fiber axis direction and the length in the direction orthogonal thereto are the same, which can be improved as compared with the above-described one using the rectangular housing. Again, the distance between the plurality of modules could not be made sufficiently small, and there was a limit to the effect of improving the lamination rate per unit volume when configuring the unit. In addition, when pressure is applied from the inside of the hollow fiber membrane 6 at the time of the above-described back washing or the like, a force is applied from the hollow fiber membrane 6 toward the projection 4a via the potting resin 5a. As described above, since the convex portion 4a is attached to the outer surface of the main body 2 with an adhesive or the like, the strength of the convex portion 4a may be reduced by this force. In particular, in the application of filtration of a highly polluting treatment liquid, when the amount of solid substance adsorbed on the outer surface of the hollow fiber membrane 6 is large and the hollow fiber membrane 6 is severely clogged, the volume of the concave portion 5 is increased and the potting resin 5a In some cases, the required strength (pressure resistance) cannot be achieved even if some measures are taken, such as increasing the amount of the resin, and there has been a problem in that the durability of the projections 4 is reduced.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a housing capable of improving the fixing strength of a hollow fiber membrane and a hollow fiber membrane module using the same. It is still another object of the present invention to provide a housing having improved pressure resistance against pressure from the inside of the hollow fiber membrane and a hollow fiber membrane module using the same. It is another object of the present invention to provide a housing capable of increasing a lamination rate per unit volume when a unit including a plurality of hollow fiber membrane modules is formed, and a hollow fiber membrane module using the same. It is another object of the present invention to provide a housing in which design conditions such as the size of the housing are not restricted as much as possible and a hollow fiber membrane module using the housing.

[0013]

In order to solve the above-mentioned problems, according to the present invention, a hollow portion is provided inside a columnar main body in a length direction thereof, and an outer surface of the main body is provided with a hollow portion in the length direction. A hollow fiber membrane module housing provided with a concave portion, and a slit opening to the hollow portion provided on the bottom surface of the concave portion, wherein an end of the hollow fiber membrane in the fiber direction is inserted into the slit. The hollow fiber membrane module housing is characterized in that the hollow fiber membrane is fixed by filling a potting resin into the concave portion so that the end portion is located in the hollow portion. suggest. The main body preferably has a U-shaped cross section orthogonal to the longitudinal direction, has one flat surface on a side surface, and the concave portion is provided on this flat surface. Also,
It is preferable that the hollow portion has a circular cross section orthogonal to the longitudinal direction. Further, it is preferable that a projection is provided that protrudes from the inner wall of the recess. Preferably, the depth of the recess is 1 to 50 mm, and the width of the slit is 0.3 to 5 mm. By using such a housing for a hollow fiber membrane module, a hollow fiber membrane module having high fixing strength of the hollow fiber membrane and good pressure resistance can be provided.

[0014]

1 (a) to 1 (c), 2 and 3
Fig. 1 shows an example of a housing and a hollow fiber membrane module of the present invention, and Figs. 1 (a) to 1 (c) show an operation of fixing a hollow fiber membrane sheet-like assembly to a housing in the order of operation. FIG. 3 is a cross-sectional view orthogonal to the length direction of a housing (main body). FIG. 2 is a plan view showing the hollow fiber membrane module, and FIG. 3 is a cross-sectional view orthogonal to the length direction of the housing (main body) showing a state where both ends of the hollow fiber membrane are fixed using two housings. .

In the figure, reference numeral 11 denotes a housing. The housing 11 has a column-shaped main body 12 having a U-shaped cross section.
The main body 12 has one rectangular flat surface 12a on the side surface thereof along the length direction of the main body 12. The flat surface 12 a is provided with a groove-shaped recess 13 having a rectangular cross section along the length direction of the main body 12. In addition, a slit 1 is formed on the bottom surface 13b of the concave portion 13 in the longitudinal direction of the main body 12.
4 are provided. The slit 14 opens in a hollow portion (water collecting portion) 15 provided inside the main body 12 and having a circular cross section in the longitudinal direction of the main body 12.

Depth of the recess 13 (height of the side wall 13a)
A can be set to a desired size as long as it satisfies the pressure resistance required for the hollow fiber membrane module and the fixing stability of the hollow fiber membrane, but is usually preferably in the range of 1 to 50 mm. If less than 1 mm, potting resin 1
6, the pressure resistance of the hollow fiber membrane module 17 may be reduced. If it exceeds 50 mm, the effective membrane area of the hollow fiber membrane module 17 decreases, which is inconvenient. The width B of the slit 14 is set to a size in which the hollow fiber membrane 6 can be inserted and the hollow fiber membrane 6 can be held with a pressing force that does not collapse. The width B of the slit 14 is such that when the hollow fiber membrane 6 is inserted, the outer surface of the hollow fiber
The hollow fiber membrane 6 can be stably held by setting such that a very large gap is not formed between the hollow fiber membrane 6 and the inner wall of the hollow fiber membrane 4. The optimum slit width varies depending on the outer diameter of the hollow fiber membrane 6 and the like, but is usually 0.3 to 5 mm.

The size of the other housing 11 is appropriately adjusted according to the size of the hollow fiber membrane 6 to be fixed and the purpose of use. In this example, the width C of the plane 12a in the cross section of the main body 12 is 10 mm, and The size D in the depth direction of the recess 13 in the cross section of the main body 12 is 22 mm,
The width E of the bottom surface 13b of the recess 13 is 7 mm, and the depth F of the slit 14 is 3 mm. The length of the housing 11 is 700 mm.

Various materials can be selected for the material of the housing 11 as long as necessary mechanical strength and durability can be obtained. Specific examples include polycarbonate, polysulfone, polyolefin, PVC (polyvinyl chloride), acrylic resin, ABS resin, and modified PPE (polyphenylene ether). This housing 1
After using the hollow fiber membrane module 17 using
When it is necessary to incinerate, a hydrocarbon-based resin that can be completely burned without emitting toxic gas is preferable.

In the hollow fiber membrane module 17 using the housing 11, a plurality of hollow fiber membranes 6 are arranged in parallel, for example, as shown in FIGS. 6 (a) and 6 (b). The hollow fiber membranes 6 can be configured using a sheet-like aggregate 8 integrated by weft yarns 7 orthogonal to the fiber axis direction. The hollow fiber membrane 6 can be made of various materials depending on the application. Specific examples include cellulose-based, polyolefin-based, polyvinyl alcohol-based, PMMA (polymethyl methacrylate) -based, and polysulfone-based ones. Of these, polyethylene and the like having a high elongation are preferable. In addition, as long as it is a hollow fiber membrane that can be used as a filtration membrane, there is no particular limitation on the pore diameter, porosity, film thickness, outer diameter, and the like, and these are appropriately adjusted depending on the use and the like.

The hollow fiber membrane module 17 can be manufactured as follows. That is, first, a sheet-like aggregate 8 having both ends 6a in the fiber axis direction of the hollow fiber membrane 6 opened is prepared. In this example, the outer diameter of the hollow fiber membrane 6 is 410 μm. On the membrane surface of the sheet-shaped assembly 8, the length of the hollow fiber membrane 6 in the fiber axis direction is 400 m.
m, and the length in the direction orthogonal thereto (the width of the sheet-shaped assembly 8) is 600 mm. Then, as shown in FIG. 1B, the end of the sheet-shaped assembly 8 (the end 6 a in the fiber axis direction of the hollow fiber membrane 6) is inserted into the slit 14, and the inside of the hollow 15 is formed. To be located at At this time, if the width of the slit 14 is small and it is difficult to insert the sheet-like aggregate 8, a means for mechanically expanding the slit 14 can be used.

Next, as shown in FIGS. 1C and 2, the concave portion 13 and the slit 14 are filled with a potting resin 16, and the hollow portion 15 and the outside of the housing 11 are liquid-tightly partitioned to form a sheet-like assembly. The body 8 is fixed. As the potting resin 16, a resin having relatively high viscoelasticity is preferable. For example, epoxy resins, unsaturated polyester resins, polyurethane resins, silicone-based fillers, various hot melt resins, and the like are suitable. Further, as shown in FIG. 3, the other end of the sheet-shaped aggregate 8 is similarly fixed to the housing 11, and the hollow fiber having both ends of the hollow fiber membrane 6 fixed to the housings 11, 11. The membrane module 17 is obtained. If a hollow fiber membrane 6 having one end 6a sealed is used as the hollow fiber membrane 6, a hollow fiber membrane module in which the housing 11 is provided only at one end of the sheet-like aggregate 8 can be formed. .

In this example, since the operability is good, a plurality of hollow fiber membranes 6 are juxtaposed and a knitted sheet-like aggregate 8 integrated with weft yarns 7 is used. In addition, although the workability is slightly reduced, a plurality of hollow fiber membranes 6 can be inserted and fixed in the slits 14 of the housing 11 while keeping the aligned state in parallel. Further, the number of the sheet-like aggregates 8 may be one, or two or more laminates may be inserted into the slit 14 of one housing 11 and fixed. When laminating two or more sheets, a plurality of sheet-shaped aggregates 8 of the same size can be used, or one obtained by folding and stacking one sheet-shaped aggregate 8 can be used.

As described above, when the folded laminate is used, a part of the end of the laminate is held in the hollow portion 15 in a state of being bent into a U-shape. At this time, if at least the end 6a of the hollow fiber membrane 6 in one sheet-like aggregate 8 constituting the laminate is held in the hollow portion 15 while maintaining the open state, the same as the above-described case is performed. A filtering action is obtained. The number of layers (folded) of the laminate is determined by the thickness (outer diameter of the hollow fiber membrane 6) of the sheet-like aggregate 8 or the sheet-like aggregate 8
Is adjusted according to the number of hollow fiber membranes 6 constituting the above, but the upper limit is usually about five.

When performing a filtration operation using the hollow fiber membrane module 17 described above, the hollow portion 1 inside the housing 11
5 is connected to an external water collecting pipe, and this water collecting pipe is connected to suction means such as a pump. Then, when the hollow fiber membrane module 17 is installed in the treatment tank filled with the treatment liquid and the suction means is operated, the hollow portion 15 becomes negative pressure through the water collecting pipe, and the treatment liquid becomes hollow. The filtrate is filtered through the fiber membrane 6, and the filtrate flows from the end 6 a of the hollow fiber membrane 6 to the hollow part 1.
5 and is collected from the collecting pipe.

When a unit is formed by arranging a plurality of hollow fiber membrane modules 17, they are arranged so that the membrane surfaces of the sheet-like aggregate 8 are parallel, and are connected to the plurality of hollow fiber membrane modules 17. Usually, the collected water pipes are collectively connected to one suction means. Then, when a solid substance adheres to the outer surface of the hollow fiber membrane 6 of the hollow fiber membrane module 17 due to the filtration operation and the filtration function of the hollow fiber membrane module 17 decreases, for example, the filtration operation is temporarily stopped, and the collecting pipe is stopped. Then, the inside of the hollow fiber membrane 6 is filled with the washing liquid to perform the back washing.

The side walls 13a, 13a of the housing 11 shown in FIGS. 1A to 1C, 2 and 3 are formed integrally with the main body 12 by forming the recess 13 in the main body 12. In the above-described back washing, by filling the hollow fiber membrane 6 with the cleaning liquid, even if a force is applied to the side wall 13a from the inside of the hollow fiber membrane 6 via the potting resin 16, the strength (pressure resistance) that can withstand sufficiently. can get. For this reason, the housing 11 and the hollow fiber membrane module 17 using the same are particularly suitable for filtering highly turbid liquids, which are likely to receive a large pressure from the inside of the hollow fiber membrane 6 during washing or the like.

Further, since the main body 12 has a U-shaped cross section, as shown in FIG. 1A, in the cross section of the main body 12, the width C of the plane 12a is closer to the hollow portion 15 side. The width of the body 12 can be designed to be comparable or narrow. Therefore, the space required for installing the hollow fiber membrane module 17 can be reduced. When a plurality of hollow fiber membrane modules 17 are arranged in parallel to form a unit, the distance between the membrane surfaces of the sheet-like aggregates 8 of the hollow fiber membrane modules 17 can be set small to improve the integration efficiency. it can. Therefore, it is suitable for a filtration treatment in a place where the size of the unit is restricted. Specifically, it is effective for, for example, filtration treatment in a septic tank disposed in a manhole.

Since the hollow section 15 has a circular cross section, the pressure applied to the inside of the hollow section 15 can be evenly dispersed. Therefore, the strength of the housing 11 can be further improved.

By the way, the housing 11 can be integrally formed by a conventional method using a synthetic resin, but can also be manufactured from three members as shown in FIG. 4, for example. That is, a U-shaped main body 21 having a U-shaped recess similar to the outer shape is prepared in the plane of the side surface, and inner members 22 and 23 forming the concave portion 13, the slit 14, and the hollow portion 15 are provided on the inner wall 21a. Glue. Again,
Since the side walls 13a, 13a are integrally formed mainly at the opening-side end of the U-shaped main body 21 constituting the outer surface of the main body 12, the strength of the side walls 13a, 13a can be secured.

Further, as shown in FIGS. 5 (a) to 5 (d), by providing linear projections 13c, 13d projecting from the inner wall of the recess 13 of the housing 11, the strength of the hollow fiber membrane module 17 is further increased. Can be improved. FIGS. 5A and 5B show the bottom surface 13 b of the recess 13.
This is an example in which a projection 13c protruding from the projection is provided. In FIG. 5A, one projection 13 c is provided on each side of the slit 14. FIG.
In (b), two protrusions 13c are provided on both sides of the slit 14. The protrusion 13c is provided in the slit 1
It is preferable to provide the hollow fiber membrane fixed to 4 in parallel with the fiber axis direction, because the effect can be further improved.
FIGS. 5C and 5D further illustrate the side wall 1 of the recess 13.
Projections 13d projecting from the inside of 3a, 13a, respectively;
13d shows an example in which 13d is provided. Protrusion 13d
Is preferably provided in a direction perpendicular to the fiber axis direction of the hollow fiber membrane fixed to the slit 14, and the effect can be further improved, which is preferable.

The size, shape and number of the projections 13c and 13d are not particularly limited as long as the effect of improving the strength can be obtained. For example, it may not be a continuous straight line, and may be provided intermittently in the length direction of the main body 12. That is, when back washing is performed when filtration is performed in the hollow fiber membrane module, potting filled in the recess 13 from the inside of the hollow fiber membrane fixed to the slit 14 by filling the hollow fiber membrane with the cleaning liquid. Pressure is applied to the resin.
This pressure causes the potting resin to move into the recess 13.
Tend to be separated from Therefore, the protrusions 13c and 13d are provided on the contact surface between the potting resin and the concave portion 13.
By providing the unevenness due to the above, peeling of the potting resin can be suppressed. As a result, the strength (pressure resistance) of the housing 11 and the hollow fiber membrane module can be further improved.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. Example 1 First, a hollow fiber membrane module similar to that shown in FIGS. 1A to 1C and FIG. 2 was manufactured. At this time, the depth of the concave portion of the housing was 5 mm, and the width of the slit was 1 mm. The sheet-shaped assembly is a polyethylene hollow fiber membrane manufactured by Mitsubishi Rayon Co., Ltd.
m, an outer diameter of 410 μm). The housing was made of ABS, and the potting resin was polyurethane resin. Next, the housing of this hollow fiber membrane module (potting resin)
Of the sheet-like aggregate extending from the vicinity of the outer surface of the potting resin to open the hollow fiber membrane to the outside. Further, the end portion of the hollow fiber membrane in the opened state was sealed with a synthetic resin similar to the potting resin to obtain a pressure test sample. For this pressure-resistant test sample, a water pressure of 98 KPa was applied to the hollow fiber membrane from the hollow side of the housing, that is, from the inside of the hollow fiber membrane, once by ON-OFF (6 sec-4se).
c) was performed intermittently as one cycle. As a result,
Even if the number of repetitions of this cycle reaches 100,000,
No breakage occurred, and sufficient strength (pressure resistance) was exhibited.

Example 2 A pressure-resistant sample was prepared in the same manner as in Example 1 except that a housing provided with a projection as shown in FIG. 5D was used, and a similar pressure-resistant test was performed. The protrusion provided on the bottom of the recess is 1 mm wide and 2 mm high
The distance from the slit to the nearest protrusion was 0.1 mm from this slit, and the distance from this protrusion to the adjacent protrusion was 0.3 mm. The protrusions provided on the inner side of the side wall had a width of 1.5 mm and a height of 1.5 mm, and were provided at a position 0.5 mm from the upper end of the side wall. As a result, no damage was observed even when the number of repetitions of the cycle exceeded 200,000.

(Comparative Example) A hollow fiber membrane module was constructed using the housing having the structure shown in FIG. 6, and the same pressure resistance test as in Example 1 was performed. The material of the housing, the hollow fiber membrane, the sheet-shaped assembly, and the potting resin were the same as in Example 1. The size of the main body is 13 mm in inner diameter, 18 mm in outer diameter, the width of the slit is 2 mm, and the height of the projection is 3 m.
m, and the width of the concave portion was 10 mm. As a result, when the number of repetitions of the cycle reached 80,000, leakage due to damage occurred.

From the results of these Examples and Comparative Examples, Examples 1 and 2 according to the present invention are superior in strength (pressure resistance) as compared with Comparative Examples, and in particular, Examples in which projections are provided on the inner wall of the concave portion. In Example 2, it was found that the effect was further improved.

[0036]

As described above, in the housing of the present invention, the side wall of the concave portion filled with the potting resin can be formed integrally with the main body. Even when a force is applied to the side wall from the inside of the hollow fiber membrane via the potting resin during washing or the like, sufficient strength (pressure resistance) can be obtained. For this reason, the housing of the present invention and the hollow fiber membrane module using the same are particularly suitable for filtering highly turbid liquids that are likely to receive a large pressure from the inside of the hollow fiber membrane during washing or the like. Also, the sectional shape of the main body of the housing is U
By forming a concave shape in the plane of the side surface, the space required for installation of the hollow fiber membrane module can be reduced. Then, when a plurality of hollow fiber membrane modules are arranged in parallel to form a unit, the integration efficiency can be improved. Therefore, it is suitable for a filtration treatment in a place where the size of the unit is restricted. Furthermore, by making the cross-sectional shape of the hollow portion inside the main body circular, the pressure applied inside the hollow portion is uniformly dispersed,
Further, the strength of the housing and the hollow fiber membrane module can be improved. Further, by providing a projection on the inner wall of the recess of the housing, the strength of the housing and the hollow fiber membrane module can be further improved. By setting the depth of the concave portion to 1 to 50 mm and the width of the slit for inserting the hollow fiber membrane to 0.3 to 5 mm, the hollow fiber membrane can be further stably fixed to the housing.

[Brief description of the drawings]

FIGS. 1A to 1C are cross-sectional views showing, in the order of operation, an operation of fixing a sheet-like aggregate of hollow fiber membranes to an example of a housing of the present invention.

FIG. 2 is a plan view of the configuration shown in FIG. 1 (c).

FIG. 3 is a cross-sectional view showing a structure of a hollow fiber membrane module in which both ends of a sheet-like assembly of hollow fiber membranes are fixed to the housing shown in FIG.

FIG. 4 is a sectional view showing an example of a method of assembling the housing shown in FIG.

5 (a) to 5 (d) are cross-sectional views showing an example in which, in the housing shown in FIG. 1 (a), a projection projecting from an inner wall of a concave portion of the housing is provided.

6A and 6B show a structure of a conventional housing and a hollow fiber membrane module, in which FIG. 6A is a sectional view and FIG. 6B is a plan view.

[Explanation of symbols]

11 ... housing, 12 ... body, 12a ... plane, 13 ...
Recess, 13a ... side wall, 13b ... bottom face, 13c, 13d ...
Projection, 14 slit, 15 hollow part (water collecting part), 16
... potting resin, 17 ... hollow fiber membrane module.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Okazaki 4-160 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture Inside the Mitsubishi Rayon Co., Ltd. Product Development Laboratory (72) Inventor Katsuyuki Yakone Sunadahashi, Higashi-ku, Nagoya City, Aichi Prefecture F-term (reference) No. 1-60, Mitsubishi Rayon Co., Ltd. Product Development Laboratory 4D006 GA02 HA02 HA03 HA12 HA19 HA93 HA95 JA13A JA13C JA19A JA19B JA19C JB01 KC03 KC13 MA01 MC11 MC22 MC33 MC37 MC62 PB08 PC62

Claims (7)

[Claims] 1. A hollow portion is provided in a columnar main body in a longitudinal direction thereof, and a concave portion is provided in an outer surface of the main body in a longitudinal direction thereof. The hollow portion is provided in a bottom surface of the concave portion. A hollow fiber membrane module housing provided with a slit that opens into the slit, by inserting an end of the hollow fiber membrane in the fiber direction into the slit, filling the recess with a potting resin,
A hollow fiber membrane module housing, wherein the hollow fiber membrane is fixed so that the end is located in the hollow part. 2. The device according to claim 1, wherein the main body has a U-shaped cross section orthogonal to a length direction thereof, has one flat surface on a side surface, and the concave portion is provided in this flat surface. Item 2. A hollow fiber membrane module housing according to item 1. 3. The hollow fiber membrane module housing according to claim 1, wherein the hollow portion has a circular cross section orthogonal to the length direction. 4. The housing for a hollow fiber membrane module according to claim 1, further comprising a projection protruding from an inner wall of the recess. 5. The hollow fiber membrane module housing according to claim 1, wherein the depth of the recess is 1 to 50 mm. 6. The hollow fiber membrane module housing according to claim 1, wherein the width of the slit is 0.3 to 5 mm. 7. A hollow fiber membrane module using the hollow fiber membrane module housing according to any one of claims 1 to 6.