JP2018171552A - Hallow fiber membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external pressure type hallow fiber membrane module that has the same positions of a raw water inlet, a filtrated water outlet, and a concentrated water outlet as those of an internal pressure type hallow fiber membrane module so that the external pressure type module can be readily converted from the internal pressure type module.SOLUTION: In an external pressure type hallow fiber membrane module of this invention, a water collecting tube 12 and a hallow fiber membrane bundle 13 are housed in a cylindrical case housing 11, a second cap 50 including a first liquid outlet 51 and a second liquid outlet 52 covers an edge part of the cylindrical case housing 11, and one of the first liquid outlet 51 and the second liquid outlet 52 is connected to an opening part on the second cap 50 side of the water collecting tube 12 with a connection tube 70.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hollow fiber membrane module used in various water treatment fields.

  Hollow fiber membrane modules are widely used in various water treatment fields. Generally, a casing having a fluid inlet / outlet, a cap, a hollow fiber membrane bundle, and a resin-sealed portion in which ends of the hollow fiber membrane bundle are resin-sealed and fixed. Many are configured (FIG. 1 of Patent Document 1).

In the hollow fiber membrane module of Patent Document 2, a hollow fiber membrane bundle is arranged around a water collection pipe arranged in the center of a cylindrical case, and the water collection pipe and the hollow fiber membrane bundle are integrated with a sealing resin. Has been. The water collecting tube and the hollow fiber membrane bundle integrated with the sealing resin are fixed in a state where the end surface of the water collecting tube is retracted inward from the end surface of the hollow fiber membrane bundle.
The inner peripheral wall near the opening of the water collecting pipe has an internal structure (for example, a screw thread for screwing and a step for fitting) that can be connected to other members, for example, a pipe. As in the known hollow fiber membrane module as shown in FIG. 1 of Document 1, it is described that caps having liquid inlets and outlets can be put on both ends (paragraph numbers 0014 and 0015).

  Patent Document 3 describes a hollow fiber membrane module in which a reinforcing function for a cap placed on the end of a cylindrical case housing is enhanced with respect to the hollow fiber membrane module.

US Patent Application Publication No. 2003/0150807 JP 2010-36122 A JP 2014-226607 A

In general, the hollow fiber membrane module includes an internal pressure type hollow fiber membrane module that performs filtration while transferring from the inside to the outside of the hollow fiber membrane, and an external pressure type hollow that performs filtration while transferring from the outside to the inside of the hollow fiber membrane. It is classified as a thread membrane module.
The filtration effective membrane area of the internal pressure type hollow fiber membrane module is smaller than that of the external pressure type module using the same number of hollow fiber membranes of the same size, and when the turbidity of the treated water (raw water) increases, the hollow fiber There is a possibility that the blockage of the flow path is prematurely caused by the adhering / depositing of suspended substances on the membrane surface. Therefore, it is possible to suppress clogging by replacing with an external pressure type hollow fiber membrane module that has a wide effective filtration area and can reduce adhesion / deposition of suspended solids per unit area, but the internal pressure type hollow fiber membrane module and the external pressure type Since the positions of the raw water inlet, the filtrate outlet, and the concentrated water outlet are different from those of the hollow fiber membrane module, it is necessary to devise the installation of piping outside the hollow fiber membrane module, and it is difficult to replace it.

  It is an object of the present invention to provide an external pressure type hollow fiber membrane module that can be easily replaced from an internal pressure type hollow fiber membrane module, in which the positions of the raw water inlet, the filtrate water outlet, and the concentrated water outlet are the same, and a manufacturing method thereof. And

As a means for solving the problems, the present invention
A water collecting pipe and a hollow fiber membrane bundle made of a porous cylindrical body are accommodated in a cylindrical case housing having a first end portion having a raw water inlet and a second end portion opposite to the first end portion in the axial direction. ,
The hollow fiber membrane bundle is disposed around the water collection pipe, and at least the hollow fiber membrane bundle on the second end side is integrated with the cylindrical case housing and the water collection pipe with a sealing resin,
The first end of the cylindrical case housing is closed with a first cap having a raw water inlet, and the second end of the cylindrical case housing is closed with a second cap having a first liquid outlet and a second liquid outlet. A hollow fiber membrane module,
The first cap side and the second cap side of the water collecting pipe are opened,
The end portion on the first cap side of the hollow fiber membrane bundle is closed, the end portion on the second cap side is opened, and both end sides face the inside of the first cap or the inside of the second cap,
An external pressure type hollow fiber in which one liquid outlet of the first liquid outlet and the second liquid outlet and an opening on the second end side of the cylindrical case housing of the water collecting pipe are connected by a connecting pipe. The present invention relates to a membrane module.

  The external pressure type hollow fiber membrane module of the present invention is the same as the internal pressure type hollow fiber membrane module and the positions of the raw water inlet, the filtrate water outlet and the concentrated water outlet. It is easy to replace the hollow fiber membrane module.

Sectional drawing to the axial direction (longitudinal direction) of the external pressure type | formula hollow fiber membrane module of this invention. The fragmentary sectional view by the side of the 2nd cap of FIG. The fragmentary sectional view of the water collection pipe used with the hollow fiber membrane module of the present invention. (A) is a fragmentary sectional view of the water collection pipe of Drawing 3, (b) is a partial sectional view of the water collection pipe of other embodiments. The fragmentary sectional view by the side of the 1st cap which is other embodiment of FIG. (A) is a front view of the inlet connection pipe of FIG. 5, and (b) is a radial cross-sectional view of a portion passing through the water passage hole of the inlet connection pipe.

(1) Hollow fiber membrane module of FIGS. 1 and 2 In the hollow fiber membrane module 10, a water collecting tube 12 and a hollow fiber membrane bundle 13 made of a porous cylindrical body are accommodated in a cylindrical case housing 11.
Further, the case housing 11 has a first end portion 11a having a raw water inlet 41, a second end portion 11b opposite to the first end portion 11a in the axial direction, and the first end portion 11a side has a raw water inlet 41. Closed by a first cap 40, the second end 11b side of the cylindrical case housing is closed by a second cap 50 having a first liquid outlet (filtrated water outlet) 51 and a second liquid outlet (concentrated water outlet) 52. Yes.
A header 15 a or 15 b is attached to the first end portion 11 a and the second end portion 11 b of the case housing 11. The first cap 40 or the second cap 50 is put on the header 15a or 15b, and these connections are made by a method such as screwing, bonding with an adhesive, or welding according to the respective materials. Can be applied.

The case housing 11, the water collecting pipe 12, the header 15a, the header 15b, the first cap 40, and the second cap 50 are made of resin or metal such as polyvinyl chloride, ABS resin, acrylic resin, polycarbonate, polyethylene, or polypropylene. Can be used.
When using the synthetic resin, for the purpose of increasing the strength of the case housing 11, the water collecting pipe 12, the header 15a, the header 15b, the first cap 40, and the second cap 50 or blocking light, A pigment or the like can be contained.

In the case housing 11, a hollow fiber membrane bundle 13 is disposed around the water collecting pipe 12, and at least the hollow fiber membrane bundle 13 on the second end portion 11b side is sealed with a resin for sealing at the resin sealing portion 35b. 11 and the water collecting pipe 12, and preferably the first end portion 11a side and the second end portion 11b side of the hollow fiber membrane bundle 13 are sealed with a resin sealing portion 35a or 35b, respectively. And the case housing 11 and the water collecting pipe 12 are integrated.
Further, in the hollow fiber membrane bundle 13, the end portion 13a on the first cap 40 side of the hollow fiber membrane bundle 13 is closed, the end portion 13b on the second cap 50 side is opened, and both end portions are inside the first cap 40 or on the second cap side. 2 faces the inside of the cap 50.

The hollow fiber membrane bundle 13 is a bundle of hundreds to thousands of known hollow fiber membranes.
The hollow fiber membrane is a known one, and has an outer diameter of preferably 1 to 3 mm, more preferably 1.3 to 1.6 mm, a hydrophilic membrane (cellulose membrane such as cellulose acetate) or a hydrophobic membrane (polyvinylidene fluoride). , Polysulfone, polyethersulfone, etc.) can be used.

When the first end 11a side of the hollow fiber membrane bundle 13 is integrated with the cylindrical case housing and the water collecting pipe with resin for sealing at the resin sealing portion 35a, the first cap of the hollow fiber membrane bundle 13 is used. The portion facing the inside 40 may have a plurality of raw water introduction holes 14 formed through the sealing resin 35a in the thickness direction.
The plurality of raw water introduction holes 14 are formed through the sealing resin layer 35a, and the leading ends of the introduction holes reach the inside of the hollow fiber membrane bundle 13 that is not fixed with the sealing resin. Although it may be reached, it does not reach the sealing resin layer 35b.
The opening area of the raw water introduction hole 14 is not particularly limited, but is preferably in the range of 1 to 15% with respect to the cross-sectional area in the radial direction of the hollow fiber membrane bundle 13.

The first end portion 13a side and the second end portion 13b side of the hollow fiber membrane bundle 13 are sealed with resin for sealing at the resin sealing portion 35a or 35b together with the cylindrical member 30 disposed between the hollow fiber membrane bundles 13. It may be integrated.
When the cylindrical member 30 is used, the outer peripheral surface 31a of the peripheral wall portion 31 of the cylindrical member 30 and the hollow fiber membrane bundle 13 are fixed with a sealing resin, and the water collecting pipe 12 is not in contact with the resin.
In addition, you may make it both the edge part of the water collection pipe | tube 12, and the cylindrical member 30 contact resin by making the length of the water collection pipe | tube 12 itself longer, and shortening the length of the cylinder member 30 further. .

The cylindrical member 30 has a cylindrical groove portion 33 formed between the lower outer peripheral wall portion 32 a and the lower inner peripheral wall portion 32 b below the peripheral wall portion 31.
An annular step surface 31 c is formed inside the cylindrical member 30 at a position facing the cylindrical groove portion 33 in the axial direction.
The cylindrical member 30 and the water collecting pipe 12 are fixed in a state where the end of the water collecting pipe 12 is fitted in the cylindrical groove portion 33 of the cylindrical member 30.

The cylindrical member 30 can be made transparent so that the resin sealing portion 35a or 35b on the opposite side can be easily seen with the naked eye.
When the cylindrical member 30 is made transparent, it is preferably made of resin such as PET resin, polystyrene resin, polyamide resin, acrylic resin, ABS resin, polycarbonate resin.

  As a sealing resin used for forming the resin sealing portion 35a or 35b, urea resin adhesive, melamine resin adhesive, phenol resin adhesive, resorcinol resin adhesive, epoxy resin adhesive, polyurethane adhesive, vinyl A urethane adhesive can be mentioned, and among these, a polyurethane adhesive is preferable.

The water collecting pipe 12 is a porous cylindrical body having a porous surface, and the water collecting pipe 12 is opened on both the first cap 40 side and the second cap 50 side. The water collecting pipe 12 can be a known pipe or a corrugated pipe.
The water collecting pipe (corrugated pipe) 12 is widely used in various fields. As shown in FIGS. 3 and 4, the water collecting pipe (corrugated pipe) 12 is continuously formed in the circumferential direction with the concave portion 21 continuously formed in the circumferential direction. The convex portions 22 are alternately formed in the axial direction.

  As shown in FIG. 3, the water collecting pipe (corrugated pipe) 12 has a water passage hole 25 in the concave portion 21 on the peripheral surface. The water passage hole 25 is formed only in the concave portion 21 and is not formed in the convex portion 22.

It is preferable that 2 to 12 water passage holes 21 are formed at equal intervals in one recess 21, more preferably 4 to 10 holes, and further 6 to 8 holes are further formed. preferable.
For example, if ten recesses 21 are formed in one recess 21 and the recesses 21 are 100 as a whole, a total of 1000 channels 25 are formed.
In the case of a water collecting pipe having a smooth surface, if too many water holes are formed, the strength of the water collecting pipe itself is lowered and cannot be used practically. However, when a corrugated pipe is used as the water collecting pipe 12, the convex portion 22 is used for reinforcement. Since it acts as a rib, more water holes can be formed as compared with a water collection pipe having a smooth surface.

Although the opening diameter of the water passage hole 25 can be adjusted by the size of the water collecting pipe 12, 2 to 10 mm is preferable, 3 to 8 mm is more preferable, and 4 to 5 mm is more preferable. When the water passage hole 25 is circular, the diameter of the opening is an inner diameter, and when the water passage hole 25 is not circular, it is an inner diameter when converted to a circle having the same area.
As described above, by using a corrugated pipe, more water passage holes 25 can be formed as compared with a water collection pipe having a smooth surface, so that the total opening area of the whole water passage hole 25 remains large ( Alternatively, the diameter of the opening can be reduced while maintaining the same level as before. Since the water pressure when raw water flows out from the water collecting pipe 12 to the water passage hole 25 can be reduced by reducing the diameter of the opening portion of the water passage hole 25, the hollow fiber located at a position close to the water passage hole 25. This is preferable because the influence on the film 13 can be reduced.

The total opening area of the water passage holes 25 is preferably at least 3 times the radial cross-sectional area of the water collecting pipe 12, and more preferably 3 to 6 times. In addition, the radial direction cross-sectional area of the water collecting pipe 12 is a cross-sectional area between the recesses facing directly in the radial direction.
The cross-sectional area ratio of 3 or more is preferable because the water pressure when raw water flows out from the water collecting pipe 12 to the water passage hole 25 can be further reduced.

The axial cross-sectional shape of the uneven portion of the water collecting pipe (corrugated pipe) 12 is preferably a trapezoidal shape as shown in FIGS. 4A and 4B, and the corner portion of the trapezoid is in contact with the hollow fiber membrane 13. A rounded one is preferred so that it will not be damaged.
4 (a) shows the projection 22 closed by the closing surface 20, and FIG. 4 (b) shows no opening corresponding to the closing surface 20, and the projection 22 is open. Even those of the structure can be used.
Since the interval (p ₁ ) between the convex portions 22 adjacent in the axial direction is the same as the interval between the concave portions 21 adjacent in the axial direction, it is determined in consideration of the opening diameter of the water passage hole 25 formed in the concave portion 21. Is done.
The height of the convex portion 22 (depth of the concave portion 21) (h ₁ ) can be about 6 to 8 mm.

The hollow fiber membrane module 10 includes at least one liquid outlet of a first liquid outlet (filtrated water outlet) 51 and a second liquid outlet (concentrated water outlet) 52 and an opening of the water collecting pipe 12 on the second cap 50 side. It has an outlet connecting pipe 70 to be connected.
The connecting pipe 70 is used as a concentrated water outlet or a concentrated water line, and a liquid outlet connected to the connecting pipe 70 is a concentrated water outlet. When the cylindrical member 30 is used, the outlet connecting pipe 70 may be fixed to the cylindrical member 30 and connected to the water collecting pipe 12.

The outlet connecting pipe 70 may have a peripheral wall part 71 and a flange part 72 formed on the opening side near the water collecting pipe.
In the outlet connecting pipe 70, the annular peripheral surface 73 in the radial direction of the flange portion 72 is in contact with the inner peripheral surface 31 b of the cylindrical member 30.
Further, the outlet connecting pipe 70 may be in a state where the annular flat surface 72a of the flange portion is in contact with the annular step surface 31c of the cylindrical member.

  The outlet connecting pipe 70 is a cylindrical space formed by a flange 72 of the connecting pipe, an outer peripheral surface of the peripheral wall 71 of the connecting pipe, and an inner peripheral surface 31b of the cylindrical member facing the outer peripheral surface of the peripheral wall 71 of the connecting pipe. It is fixed to the cylindrical member 30 with an adhesive filled in the (adhesive portion 60).

  In addition, the shape and structure of the outlet connecting pipe 70 and the shape and structure of the cylindrical member 30 are illustrated in FIGS. 3 and 4 of Patent Document 3 and in the aspects described in paragraphs 0031 to 0036 as different aspects from the above. Things can also be used.

  In the second cap 50, the first liquid outlet (filtrated water outlet) 51 and the second liquid outlet (concentrated water outlet) 52 are in the axial direction of the cylindrical case housing 11 or in a direction different from the axial direction, preferably orthogonal to the axial direction. The liquid outlet that is not connected to the outlet connecting pipe 70 (that is, the filtrate water outlet 51) is formed in the axial direction of the cylindrical case housing 11 and connected to the outlet connecting pipe 70. (In other words, the concentrated water outlet 52) is preferably formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction.

In the second cap 50, the filtrate outlet 51 is formed in the axial direction of the cylindrical case housing 11, and the concentrated water outlet 52 is formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction. In this case, the outlet connection pipe 70 is connected to a concentrated water outlet 52 formed in a direction different from the axial direction of the cylindrical case housing 11, preferably in a direction orthogonal to the axial direction.
The outlet connecting pipe 70 is formed in a direction orthogonal to the axial direction of the cylindrical case housing 11 using a bent pipe 74 such as an elbow pipe on the side connected to the opening of the water collecting pipe 12 on the second cap 50 side. It may be connected to the concentrated water outlet 52. The bent tube 74 may be a 90 ° elbow tube or an elbow tube other than 90 °.
Further, a flexible pipe (pipe) 75 may be connected between the bent pipe 74 and the concentrated water outlet 52. The flexible pipe (pipe) 75 may be a resin pipe having flexibility. For example, an elastomer resin such as polyester, polyamide, polyolefin, or polyurethane, a vinyl chloride resin, or a soft polyethylene resin can be used. .

  In the second cap 50, the concentrated water outlet connected to the outlet connecting pipe 70 is formed in the axial direction of the cylindrical case housing 11 (for example, the first liquid outlet 51), and the second liquid outlet not connected to the outlet connecting pipe 70 is a cylinder. When formed in a direction different from the axial direction of the case housing 11, preferably in a direction orthogonal to the axial direction (for example, the second liquid outlet 52), the outlet connecting pipe 70 is an opening on the second cap 50 side of the water collecting pipe 12. The side opposite to the side connected to the portion extends in the axial direction and is connected to the first liquid outlet 51.

  In the first cap 40, the raw water inlet 41 may be formed in a direction different from the axial direction of the cylindrical case housing 11, as shown in FIG. 1, and preferably in a direction perpendicular to the axial direction, as shown in FIG. Further, it may be formed in the axial direction of the cylindrical case housing 11. From the viewpoint of easy replacement, the position of the raw water inlet 41 can be selected according to the position of the raw water inlet of the internal pressure type hollow fiber membrane module to be replaced.

  In the first cap 40, when the raw water inlet 41 is formed in the axial direction of the cylindrical case housing 11, as shown in FIGS. 5 and 6, the raw water inlet 41 and the opening of the water collecting pipe 12 on the first cap 40 side. May be connected by an inlet connecting pipe 80. By using the inlet connecting pipe 80, the raw water supply to the water collecting pipe 12 becomes efficient, and the filtration efficiency is improved. The mode of connecting the inlet connecting pipe 80 and the water collecting pipe 12 may be the same as the mode of connecting the outlet connecting pipe 70 and the water collecting pipe 12 described above.

  As shown in FIGS. 5 and 6, the inlet connection pipe 80 may have a water passage hole 81 on the peripheral surface. When the water passage hole 81 is formed in the inlet connection pipe 80, the hollow fiber membrane bundle 13 has a plurality of raw water introduction holes 14 formed by penetrating the sealing resin 35a in the thickness direction. The raw water can be supplied to the raw water introduction hole 14 through the water passage hole 81. By supplying raw water to the water collection pipe 12 and the raw water introduction hole 14, efficient filtration becomes possible.

It is preferable that 2 to 12 water holes 81 are formed at equal intervals on the peripheral surface of the inlet connecting pipe 80, and more preferably 4 to 8 are formed.
The diameter of the opening of the water passage hole 81 can be adjusted by the size of the inlet connecting pipe 80, but is preferably 5 to 50 mm, and more preferably 10 to 30 mm. In addition, when the water flow hole 81 is circular, the diameter of the opening is an inner diameter, and when it is not circular, it is an inner diameter when converted to a circle having the same area.

Next, a method for producing the hollow fiber membrane module shown in FIGS.
The hollow fiber membrane module of the present invention has a well-known centrifugal bonding method (Japanese Patent Laid-Open Nos. 51-93788, 52-38797, 61-171503, 61-171504). In addition to the manufacturing method described in paragraph numbers 0029 to 0031 of JP 2005-52736 A and the manufacturing method described in paragraph numbers 0010 to 0024 of JP 2006-281051 A, It can be manufactured by integrating the water collecting pipe 12, the hollow fiber membrane (bundle) 13, the case housing 11, and the cylindrical member 30 with a sealing resin.

Thereafter, the resin sealing portion 35 b is cut to open the end of the hollow fiber membrane (bundle) 13. The resin sealing portion 35a does not open the end of the hollow fiber membrane (bundle) 13 by cutting.
Thereafter, with the outlet connecting pipe 70 arranged at a predetermined position, the cylindrical space (adhesive portion 60) is filled with an adhesive and fixed to the cylindrical member 30.

Thereafter, the first cap 40 and the second cap 50 are attached. The cap 50 is attached by fitting the peripheral edge of the opening to the header 15b so that the second liquid outlet (concentrated water outlet) 52 and the outlet connecting pipe 70 are connected. A seal member can also be interposed at a contact portion between the first cap 40 or the second cap 50 and the header 15a or 15b.
Here, when the second liquid outlet (concentrated water outlet) 52 of the second cap 50 is formed in a direction perpendicular to the axial direction of the cylindrical case housing 11, the bent pipe 74 and the flexible pipe are provided in the outlet connecting pipe 70. When the (pipe) 75 is used, the direction of the outlet connecting pipe 70 fixed by the cylindrical member 30 by the bent pipe 74 can be changed from the axial direction to the direction orthogonal to the axial direction, and the flexible pipe (pipe) 75 can be By interposing, it can be easily connected with the concentrated water outlet 52.

A filtration operation method of the hollow fiber membrane module shown in FIGS. 1 to 2 using a corrugated pipe as shown in FIG. 3 as the water collecting pipe will be described.
During operation of the hollow fiber membrane module 10, the source water that passes through the water collection pipe 12 enters the hollow fiber membrane bundle 13 through the water passage hole 25 formed in the recess 21 of the water collection pipe 12, and is filtered. Is done. Here, the first end portion 11 a side of the hollow fiber membrane bundle 13 is integrated with the cylindrical case housing 11 and the water collecting pipe 12 with a sealing resin at the resin sealing portion 35 a, and the sealing resin is sealed in the hollow fiber membrane bundle 13. In the case of having a plurality of raw water introduction holes 14 formed so as to penetrate 35a in the thickness direction, the raw water is filtered while being supplied also to the central portion of the hollow fiber membrane bundle 13 and the surroundings other than the central portion. Therefore, since the bias of the raw water flow is reduced, it is difficult to form a sediment layer derived from the suspended substance on the surface of the hollow fiber membrane, and the filtration efficiency is improved.

Thereafter, the filtrate obtained by filtering with the hollow fiber membrane bundle 13 fills the space 53 in the second cap 50, and then drains through the first liquid outlet (filtrated water outlet) 51, or It is sent to the permeate tank and stored. The permeate stored in the permeate tank can be reused for back pressure washing of the hollow fiber membrane bundle 13 and the like.
Concentrated water generated as permeated water is discharged through the water collecting pipe 12, the tubular member 30 connected to the end of the water collecting pipe 12, the outlet connecting pipe 70, and the second liquid outlet (concentrated water outlet) 52. The

The external pressure type hollow fiber membrane module 10 of the present invention is an internal pressure type hollow fiber membrane module when the turbidity of water to be treated (raw water) is increased in a water treatment system using the internal pressure type hollow fiber membrane module. Since the positions of the raw water inlet, the filtrate outlet, and the concentrated water outlet are the same, there is no need to devise the installation of the piping outside the hollow fiber membrane module, and the internal pressure type hollow fiber membrane module is changed to the external pressure type hollow fiber membrane. Easy replacement with modules.
The internal pressure type hollow fiber membrane module has a hollow fiber membrane bundle housed in a cylindrical case housing having a first end having a raw water inlet and a second end opposite to the first end in the axial direction. The first end of the cylindrical case housing is closed with a first cap having the raw water inlet, and the second end of the cylindrical case housing is closed with a second cap having the filtered water outlet and the concentrated water outlet. It is preferable from the viewpoint of easy replacement with the external pressure type hollow fiber membrane module of the present invention.
In particular, the internal pressure type hollow fiber membrane module described in Patent Document 1 or 3 is formed such that the filtrate outlet of the second cap is in the axial direction of the cylindrical case housing and the concentrated water outlet is perpendicular to the axial direction of the cylindrical case housing. In the second cap 50 of the external pressure hollow fiber membrane module 10 of the present invention, the filtrate outlet 51 is formed in the axial direction of the cylindrical case housing 11, and the concentrated water outlet 52 is in the axial direction of the cylindrical case housing 11. Since the positions of the filtered water outlet and the concentrated water outlet are the same, it is easier to replace the internal pressure type hollow fiber membrane module with the external pressure type hollow fiber membrane module of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Hollow fiber membrane module 11 Case housing 12 Catchment pipe 13 Hollow fiber membrane (bundle)
21 Concave part 22 Convex part 25 Water flow hole 30 Cylindrical member 35 Resin sealing part 40 1st cap 50 2nd cap 70 Outlet connection pipe

Claims (3)

A water collecting pipe and a hollow fiber membrane bundle made of a porous cylindrical body are accommodated in a cylindrical case housing having a first end portion having a raw water inlet and a second end portion opposite to the first end portion in the axial direction. ,
The hollow fiber membrane bundle is disposed around the water collection pipe, and at least the hollow fiber membrane bundle on the second end side is integrated with the cylindrical case housing and the water collection pipe with a sealing resin,
The first end of the cylindrical case housing is closed with a first cap having a raw water inlet, and the second end of the cylindrical case housing is closed with a second cap having a first liquid outlet and a second liquid outlet. A hollow fiber membrane module,
The first cap side and the second cap side of the water collecting pipe are opened,
The end portion on the first cap side of the hollow fiber membrane bundle is closed, the end portion on the second cap side is opened, and both end sides face the inside of the first cap or the inside of the second cap,
An external pressure type hollow fiber in which one liquid outlet of the first liquid outlet and the second liquid outlet and an opening on the second end side of the cylindrical case housing of the water collecting pipe are connected by a connecting pipe. Membrane module.   At least one of the first liquid outlet and the second liquid outlet of the second cap is formed in a direction different from the axial direction of the cylindrical case housing, and the second end of the cylindrical case housing of the water collecting pipe The hollow fiber membrane module according to claim 1, wherein the hollow fiber membrane module is connected to the opening on the part side by a connecting pipe. The first end side of the hollow fiber membrane bundle is integrated with the cylindrical case housing and the water collecting pipe with a sealing resin,
The portion facing the inside of the first cap of the hollow fiber membrane bundle has a plurality of raw water introduction holes formed through the sealing resin in the thickness direction. Or the hollow fiber membrane module of 2.

Images