JP2603669Y2 - Hollow fiber membrane module - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention is applied to, for example, filtration, fresh water,
The present invention relates to a hollow fiber membrane module used for wastewater treatment and the like.

[0002]

2. Description of the Related Art Conventionally, filtration is generally used as a means for removing fine particle components in waste water and reusing water. In particular, a microfiltration membrane is used to remove even ultrafine particles, and a hollow fiber type external pressure filtration system is often used to treat a liquid containing a large amount of suspended substances.

As a conventional hollow fiber membrane module obtained by modularizing the hollow fiber membrane type, for example, there is one as shown in FIG. That is, in the hollow fiber membrane modules 100 and 100 ′, a bundle of a large number of hollow fiber membranes 102 is filled in a cylindrical case 101, and a gap between each hollow fiber membrane 102 and each hollow Potting material 103 as a sealing material between thread film 102 and case 101
(Polyurethane-based, epoxy-based adhesive, etc.) are sealed and fixed (potting). Hollow fiber membrane 1
The packing method of the bundle No. 02 is roughly divided into a loop type (hollow fiber membrane module 100) shown in FIG.
There are two types of double-end potting type (hollow fiber membrane module 100 ') shown in (b).

The raw water supply port 104 is provided with a hollow fiber membrane module 10 of a loop type or a double-sided potting type.
0, 100 'are provided on the side of the case 101,
A permeate outlet 105 is provided downstream of the potting section 106. Raw water is supplied from the raw water supply port 104 to the hollow fiber membrane 1
02 is filtered from the outer surface to the inside, and the filtered permeate is discharged through the permeate outlet 105.

That is, the hollow fiber membrane module 10
0,100 ′ indicates that the substance to be removed (fine particle component) is trapped on the outer surface of the hollow fiber membrane 102 and the hollow fiber membrane 10
2, the operation of peeling off the deposits on the outer surface, that is, the washing of the hollow fiber membrane 102 is performed, and the continuous operation is performed while repeating the filtration and washing steps.

Here, the cleaning of the hollow fiber membrane 102 is carried out by chemical treatment, backwashing, cleaning in which the hollow fiber membrane 102 is oscillated, and cross-flow cleaning (flushing cleaning) alone or in combination.

[0007] The washing for swinging the hollow fiber membrane 102 includes mechanical washing, ultrasonic washing, and bubbling washing for allowing the hollow fiber membrane 102 to swim by blowing air.

[0008]

As described above, a problem arises when the hollow fiber membrane 102 is forcibly swung.
This is a measure for preventing the hollow fiber membrane 102 from breaking, and may not be solved by simply increasing the strength of the hollow fiber membrane 102.

In the case of the loop type hollow fiber membrane module 100, when cleaning air is blown from a cleaning air supply port 107 provided below the module,
The hollow fiber membranes 102 may be turned up, and the hollow fiber membranes 102 may be entangled with each other, resulting in reduced filtration efficiency and cleaning efficiency. Also, when the hollow fiber membrane 102 becomes longer,
The axial flow path resistance of the hollow fiber membrane 102 in the axial direction increases, and the hollow fiber membrane 102 on the opposite side of the potting portion 106 is not effectively used.

In the case of the hollow fiber membrane module 100 'of the double-end potting type, there is no entanglement or curling of the hollow fiber membrane 102. However, when the hollow fiber membrane 102 is swung anyway, the hollow fiber membrane 102 is damaged and becomes hollow. The cut of the thread film 102 occurs.

In particular, the portion where the hollow fiber membrane 102 is easily damaged is the root portion of the potting portion 106 as shown in FIGS. 5 and 6 (a). When the air A intensively hits the hollow fiber membrane 102, the hollow fiber membrane 102 is easily cut.

That is, the potting material 103 is sucked up near the outer periphery of the bundle of the hollow fiber membranes 102, and the air A
Is directly hit, and thus is easily damaged (portion indicated by arrow D in FIG. 6A). This is because, as shown in FIG.
Suction part V of potting material 103 on the wall of No. 02
When the hollow fiber membrane 102 is swung, the hollow fiber membrane 102 is liable to be cut by bending around this portion as a fulcrum.

As a countermeasure, the root portion of the bundle of hollow fiber membranes 102 is protected by a protective member 1 such as a pipe, a tubular nonwoven fabric, or a net.
At 08, there is a case where the potting material 103 is sucked and can be immobilized.

However, if the bundle of the hollow fiber membranes 102 becomes too thick (φ50 mm or more), the potting material 1
03 does not have a sufficient function of holding the hollow fiber membrane 102. When the protective member 108 is a single layer as shown in FIG. 6B and a tubular non-woven fabric is used as the protective member 108, the potting material 103 permeates and solidifies into the non-woven fabric, and the hollow fiber membrane 102 is Bends, receives damage, and cuts (arrow D 'in the figure).

The present invention has been made to solve the above-mentioned problems of the prior art, and aims at eliminating the breakage of the hollow fiber membrane, extending the service life, and improving the durability. To provide a hollow fiber membrane module that can be obtained.

[0016]

In order to achieve the above object, according to the present invention , a hollow fiber is provided in a hole provided in a case.
Insert the end of the bundle of membranes into the end of the bundle of hollow fiber membranes.
The gap between the gap and the hollow fiber membranes and the case of holes of the hollow fiber membranes a hollow fiber membrane module was sealed fixed with a sealing material that, in the fleeting inner and hollow fiber membrane pores of the case Arranged
And protrudes inward in the axial direction from the suction part of the sealing material.
A first protection member extending so as to
Disposed between the bundles of hollow fiber membranes,
A second protection member extending so as to protrude inward in the axial direction .

In the hollow fiber membrane module having the above structure,
It can be the middle hollow fiber membrane swings is prevented cutting the hollow fiber membrane by suck up portion of the sealing member by the first protective member, the cutting of the hollow fiber membrane according to the first protective member by the second protective member As a result, the breakage of the hollow fiber membrane is reliably prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiment. 1 to 3 showing a hollow fiber membrane module according to an embodiment of the present invention, reference numeral 1 denotes a hollow fiber membrane module, and the hollow fiber membrane module 1 is of an external pressure filtration type. A plurality of bundles of hollow fiber membranes 3 are exposed and held, and the gap between the hollow fiber membranes 3 and the gap between each hollow fiber membrane 3 and the case 2 at the opening of the case 2 are potted as a sealing material. In this configuration, the material 4 is sealed and fixed (potted) via first and second protection members 6 and 7 arranged on the outer periphery of the hollow fiber membrane bundle 5.

The hollow fiber membrane bundle 5 has a straight shape, and both ends thereof are held by the case 2. The case 2 includes a potting head member 21 that holds the end of the hollow fiber membrane bundle 5 on the side where the end of the hollow fiber membrane 3 is opened and the permeate flows out,
A potting rear member 22 which is a sealing side on which an end of the hollow fiber membrane 3 on the opposite side is closed, and a support column 23 for supporting the potting head member 21 and the potting rear member 22 at a predetermined interval. I have. The potting head member 21 and the potting rear member 22 have a plurality of holes 24 penetrating in the axial direction.

The ends of the hollow fiber membrane bundles 5 having a small diameter are inserted into the holes 24 of the potting head member 21 and the potting rear member 22, and each hole 24 is filled with the potting material 4. The gap between each hollow fiber membrane 3 and the gap between each hollow fiber membrane 3 and the inner circumference of the hole 24 is potted via the first and second protection members 6 and 7. At this time, the potting head member 21 side keeps the end of each hollow fiber membrane open, and the potting rear member 22 side holds each hollow fiber membrane 2.
Terminal is sealed.

FIG . 3 and FIG.
As shown, the first protection member 6 is a hollow fiber membrane bundle 5.
At the root of the potting material, which protects the portion of the hollow fiber membrane 3 where the potting material 4 is sucked up in the form of a film on the outer wall.
Extend <br/> so as to project axially inward than the smoke rising portion 41 of the. The second protection member 7 is provided between the first protection member 6 and the outer peripheral portion of the hollow fiber membrane bundle 5, and extends so as to protrude axially inward from the first protection member 6. Note that the first protection member 6 and the second protection member in FIGS.
The protection member 7 also has the same configuration as in FIGS. 3 and 6C.
ing.

The root portions of the hollow fiber membrane bundles 5 are protected by the first and second protection members 6 and 7 configured as described above.

In the hollow fiber membrane module 1 configured as described above, raw water is filtered from the outer surface of the hollow fiber membrane 3 through the inside, and the filtered permeate is opened at the end of the hollow fiber membrane 2. The hole 24 of the potting head 21 is discharged as the permeated liquid outlet 5A, and is of an external pressure filtration type.

The hollow fiber membrane module 1 is shown in FIG.
As shown in FIG.

The housing 8 comprises a cylindrical body 81 in which the hollow fiber membrane module 1 is housed, and upper and lower lids 82 and 83 for closing both openings of the cylindrical body 81. And
When the hollow fiber membrane module 1 is mounted, a raw water supply port A9 is provided on the side surface of the cylindrical body 81 at a position substantially the same in the radial direction as the position of the potting head portion 21 of the hollow fiber membrane module 1, and the raw water supply port 9 is viewed in cross section. The cleaning liquid discharge port 10 is provided so as to oppose. A cylindrical member having a permeated liquid outlet port 11 for allowing the permeated liquid flowing out from the permeated liquid outlet 5A of the hollow fiber membrane module 1 in the axial direction of the hollow fiber membrane module 1 at the time of mounting of the upper lid 82 to the outside. 82A are provided. Further, a support member 82B which detachably supports the hollow fiber membrane module 1 having a hole communicating with the permeated liquid outlet port 11 is provided on the inner periphery of the cylindrical member 82 in a liquid-tight manner via a seal member.

On the other hand, the outer peripheral portion of the potting head portion 21 has a screw portion, and this screw portion is
The hollow fiber membrane module 1 is mounted in a state of being suspended from the housing 8 by being screwed into the threaded portion of the hollow fiber membrane module. That is, the hollow fiber membrane module 1 is detachable from the housing 8 by being screwed into or removed from the support member 82B.

Further, the hollow fiber membrane module 1 of the lower lid 83 is provided.
A drain port 12 for discharging raw water in the axial direction at the time of mounting is provided.
An air supply port 13 for supplying air A into the housing 8 is inserted into the inside of the housing 2. On the other hand, an air supply port 1 for supplying air A into the hollow fiber membrane module 1
4 is formed through the potting rear portion 22. A raw water supply port B9 'is provided radially outside the drain port 12.

By mounting the hollow fiber membrane module 1 having the hollow fiber membrane bundle 5 exposed on the housing 8 configured as described above, the raw water is supplied from the raw water supply ports A, B9, 9 'into the housing 8. And the substance to be removed (fine particle component) in the supplied raw water is captured on the outer surface of the hollow fiber membrane 3, and the captured permeate passes through the inside of the hollow fiber membrane 3 to form the hollow fiber membrane module 1. The liquid flows out through the permeated liquid outlet 5A and the permeated liquid outlet port 11.

Then, at a certain point, an operation of peeling off the deposit on the outer surface of the hollow fiber membrane 3, that is, cleaning of the hollow fiber membrane 3 is performed. Cleaning is performed in the raw water supply ports A, B9,
The cleaning liquid is supplied from 9 'or the like, and the cleaning liquid discharge port 10 for chemicals or the like is provided.
The air A is supplied to the respective hollow fiber membrane bundles 5 of the hollow fiber membrane module 1 through the air supply port 13 and the air supply port 14 to swing the hollow fiber membrane 3.

As described above, continuous operation is performed while repeating the filtration and washing steps.

In the hollow fiber membrane module having the above structure,
The first protection member 6 prevents the hollow fiber membrane 3 from bending when the hollow fiber membrane 3 swings at the suction portion 41 of the potting material 4, thereby preventing the hollow fiber membrane 3 from being cut. Since the bending of the hollow fiber membrane 3 by the first protection member 6 is prevented, the hollow fiber membrane 3 is prevented from being cut, so that the hollow fiber membrane 3 is reliably prevented from being cut. Therefore, a durable hollow fiber membrane module having a long life can be provided.

Further, since the hollow fiber membrane bundle 5 is held in the case 2 as a plurality of small diameter bundles in one module, the cleaning property of each hollow fiber membrane 3 is ensured (the hollow fiber membrane bundle 5 is When the diameter is increased, the washing efficiency of the hollow fiber membrane 3 at the center in the radial direction is reduced.), And the protection effect of the first and second protection members 6 and 7 provided at the potting root portion of the hollow fiber membrane bundle 5 is enhanced. .

Since the hollow fiber membrane module is detachable from the housing 8, the hollow fiber membrane module
Even if is deteriorated, the housing 8 can be used continuously. Further, even when chemical cleaning cannot be performed due to the material of the housing 8 and the material such as piping, the hollow fiber membrane module can be taken out of the housing 8 to perform chemical cleaning.

Further, the raw water supply ports A, B9, 9 'are shown in FIG.
As shown in the figure, the raw water supply port A9 is installed at substantially the same position in the radial direction as the potting head member 21 and the raw water supply port B9 'is installed toward the sealing side of the potting rear member 22. The flow of raw water supplied from the mouth is not directly damaged by the specific hollow fiber membrane 3.

A specific example will be described below with reference to FIGS.

[Specific Example] A potting head member 21 having φ20 mm × 7 holes 24 is used. The potting material 4 is made of polyurethane, and the hollow fiber membrane 3 has an outer diameter φ0.36 mm × inner diameter φ.
0.20 mm polysulfone hollow fiber membrane (pore diameter 0.2
μm) to prepare a hollow fiber membrane module 1 (effective length 200 mm), and attached to the housing 8. Filtration pressure 1
Filtration of tap water at ~ 1.5 kg / cm2 for 1 minute ← → Repeated bubbling washing with air blowing flow rate of 500 Nl / hr for 1 minute. Was not done.

The first and second protective members 6 and 7 used here are of the type A, the first protective member 6 having an outer diameter of φ18.
mm × 13 mm inner diameter PVC pipe, second protective member 7:
As the nonwoven fabric made of polypropylene, the first protective member 6: nonwoven fabric made of polypropylene, and the second protective member 7: nonwoven fabric made of polypropylene were used as type B, and similar results (no breakage of the hollow fiber membrane 3) were obtained for each. .

Hereinafter, Comparative Examples 1 and 2 will be described.

Comparative Example 1 A hollow fiber membrane module was manufactured using a PVC pipe having an inner diameter of 77 mm as the potting head member 21 (the shape of the housing 8, the used hollow fiber membrane 3 and the like are the same as in the specific example). When the same evaluation as that of the example was performed, one hollow fiber membrane 3 was cut after 24 hours, and the number of cut hollow fiber membranes 3 tended to increase gradually, and became about 10 after 7 days. .

[Comparative Example 2] In the same manner as in the specific example, when the potting head member 21 having φ20 mm × 7 holes 24 was used, and only one nonwoven fabric made of polypropylene was used as the first protective member 6, the hollow fiber membrane 3 was used. After 6 days, it was confirmed that the protection function was insufficient.

In both Comparative Examples 1 and 2, the location where the hollow fiber membrane 3 was cut was near the potting root portion and near the outer periphery of each hollow fiber membrane bundle 5.

In the above-described embodiment, the description has been made by taking the both-end potting type module as an example. However, it is needless to say that the present invention is similarly applied to the loop type module. Also, the first and second protection members have been described as one each, but the number of each protection member is not particularly limited.

The present invention has the above-described structure and operation , and the first protective member prevents the hollow fiber membrane from bending when the hollow fiber membrane swings at the sucking portion of the sealing material. The breakage of the hollow fiber membrane is prevented by preventing the breakage of the hollow fiber membrane by the second protection member and the bending of the hollow fiber membrane by the first protection member, thereby reliably preventing the breakage of the hollow fiber membrane. Therefore, the life was extended and the durability was improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a hollow fiber membrane module according to an embodiment of the present invention is mounted on a housing.

FIG. 2 (a) is a half sectional view of a hollow fiber membrane module taken out of a housing, and FIG. 2 (b) is a front view of FIG. 2 (a).

FIG. 3 is a schematic sectional view of a potting portion of the hollow fiber membrane module according to one embodiment of the present invention.

FIG. 4 is a schematic sectional view of a conventional hollow fiber membrane module. FIG. 4 (a) shows a loop type hollow fiber membrane module, and FIG. 4 (b) shows a double-end potting type hollow fiber membrane module. Is shown.

FIG. 5 is a schematic sectional view of a potting portion of a conventional hollow fiber membrane module.

FIG. 6 (a) is a sectional view of a main part of a conventional potting portion, and FIG. 6 (b) is a conventional potting portion with a protection member 1;
FIG. 4C is a cross-sectional view of a main part of the two-layer protective member in the potting portion according to an embodiment of the present invention.

[Description of Signs] 1 Hollow fiber membrane module 2 Case 21 Potting head member 22 Potting rear member 23 Prop 24 Hole 3 Hollow fiber membrane 4 Potting material (sealing material) 41 Suction part 5 Hollow fiber membrane bundle 5A Permeate outlet 6 1st protective member 7 2nd protective member 8 housing 81 cylindrical body 82 upper lid 82A cylindrical member 82B support member 83 lower lid 9 raw water supply port A 9 'raw water supply port B 10 cleaning liquid outlet 11 permeate outlet port 12 drain port 13 Air supply port 14 Air supply port

Claims (1)

(57) [Scope of request for utility model registration] 1. A bundle of hollow fiber membranes is inserted into a hole provided in a case .
A hollow fiber membrane module in which an end is inserted and a gap between each hollow fiber membrane and a gap between each hollow fiber membrane and a hole of a case at an end of the bundle of the hollow fiber membranes is sealed and fixed with a sealing material. Disposed between the inner periphery of the hole of the case and the bundle of hollow fiber membranes.
Protrudes inward in the axial direction from the suction part of the sealing material
And a first protection member extending between the first protection member and the bundle of hollow fiber membranes.
Extends so as to protrude axially inward from the first protection member
And a second protective member .