WO2019059345A1

WO2019059345A1 - Hollow fiber membrane module, fitting structure for hollow fiber membrane modules, and wastewater treatment system

Info

Publication number: WO2019059345A1
Application number: PCT/JP2018/035027
Authority: WO
Inventors: 波形　和彦
Original assignee: Nok株式会社
Priority date: 2017-09-25
Filing date: 2018-09-21
Publication date: 2019-03-28
Also published as: CN212383493U; JP3213882U

Abstract

Provided are: a hollow fiber membrane module which has excellent sealing performance and excellent workability during fitting; a fitting structure for hollow fiber membrane modules; and a wastewater treatment system. A hollow fiber membrane module 200 according to the present invention is provided with a hollow fiber membrane bundle 210, a case 220 that is provided on an end of the hollow fiber membrane bundle 210, and a sealing/affixing part 230. This hollow fiber membrane module 200 is characterized in that: at least one seal ring 240 for sealing the annular gap between the outer circumferential surface of the case 220 and the inner circumferential surface of a fitting hole 310a is fitted to the outer circumferential surface of the case 220, said seal ring 240 being formed from an elastic body; and the outer circumferential surface of the case 220 is provided with at least one lock projection 223 that is locked to a part to be locked 311 that is provided on the inner circumferential surface of the fitting hole 310a.

Description

Hollow fiber membrane module, mounting structure of hollow fiber membrane module and drainage treatment apparatus

The present invention relates to a hollow fiber membrane module used for a waste water treatment apparatus and the like, a mounting structure of the hollow fiber membrane module, and a waste water treatment apparatus.

An apparatus using a membrane separation activated sludge method (MBR) is known as a waste water treatment apparatus for purifying sewage, factory drainage, etc., which can be miniaturized as compared with the conventional precipitation method. The waste water treatment apparatus using the MBR includes a water collection pipe for collecting filtered water, and a plurality of hollow fiber membrane modules attached to the water collection pipe. The hollow fiber membrane module also includes a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes, and a case provided at an end of the hollow fiber membrane bundle. And the case provided in the several hollow fiber membrane module is each attached to the several attachment hole provided in the water collection pipe.

Here, it is necessary to seal an annular gap between the inner peripheral surface of the mounting hole and the outer peripheral surface of the case in order to prevent the entry of unfiltered muddy water or the like into the water collection pipe. Therefore, conventionally, after the adhesive is applied to the inner peripheral surface of the mounting hole and the outer peripheral surface of the case, the case is inserted into the mounting hole, and the case is adhered to the mounting hole by curing the adhesive. . However, in the case of such an attachment method, if the amount of adhesive is too small, the annular gap is not sufficiently sealed, and if the amount of adhesive is too large, the adhesive flows into the water collecting pipe and the flow passage area It may be narrowed. Therefore, it is difficult not only to control the application amount of the adhesive but also to require skill in the method of applying the adhesive, and it is also difficult to control the viscosity and curing time of the adhesive.

JP 10-249171 A JP 2008-188579 A JP, 2012-187555, A

An object of the present invention is to provide a hollow fiber membrane module excellent in sealing performance and excellent in installation workability and a hollow fiber membrane module mounting structure and a drainage treatment apparatus.

The present invention adopts the following means in order to solve the above problems.

That is, the hollow fiber membrane module of the present invention is
In a hollow fiber membrane module attached to a mounting hole provided in a pipe for collecting filtered liquid,
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
A hollow fiber membrane module in which the case is attached to the attachment hole,
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole The present invention is characterized in that at least one locking projection that is locked to a locked portion provided on the inner peripheral surface side of the housing is provided.

In addition, the mounting structure of the hollow fiber membrane module of the present invention is
In the hollow fiber membrane module mounting structure to a mounting hole provided in a pipe for collecting the liquid filtered by the hollow fiber membrane module,
The hollow fiber membrane module is
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole The present invention is characterized in that at least one locking projection that is locked to a locked portion provided on the inner peripheral surface side of the housing is provided.
Furthermore, the waste water treatment apparatus of the present invention is
A tank in which a large amount of microorganisms are propagated inside;
A plurality of hollow fiber membrane modules provided in the tank;
A collection pipe for collecting the liquid filtered by each of the plurality of hollow fiber membrane modules;
Waste water treatment equipment using a membrane separation activated sludge method comprising
A plurality of hollow fiber membrane modules are respectively attached to a plurality of attachment holes provided in the water collection tube,
Each hollow fiber membrane module is
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole The present invention is characterized in that at least one locking projection that is locked to a locked portion provided on the inner peripheral surface side of the housing is provided.

According to these inventions, an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is sealed by an elastic seal ring. Accordingly, the sealing performance is stably exhibited, and there is no need to control the amount of the adhesive applied as in the case of adhesion by the adhesive, so that the mounting workability is excellent. In addition, since the locking projection provided on the outer peripheral surface side of the case is locked to the locked portion provided on the inner peripheral surface side of the mounting hole, the case is also prevented from being detached from the mounting hole be able to.

The at least one elastic seal ring may be mounted in an annular mounting groove individually provided on the outer peripheral surface of the case.

Thereby, since the seal ring is positioned, the posture of each seal ring is stabilized, and the sealing performance by each seal ring is more stably exhibited. In addition, since the seal ring may be attached to the attachment groove provided on the outer peripheral surface of the case, the attachment work of the seal ring is easy.

The case may be provided with a positioning portion which positions the mounting direction of the case by abutting on a surface around the mounting hole.

As a result, the case may be inserted into the mounting hole until the positioning portion provided in the case abuts on the surface around the mounting hole, which facilitates the mounting work of the case, and the locking projection to the locked portion It becomes possible to make it lock more certainly.

As described above, according to the present invention, the sealing performance can be improved, and the mounting workability can be improved.

FIG. 1 is a schematic block diagram of a waste water treatment apparatus according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a hollow fiber membrane module according to an embodiment of the present invention. FIG. 3 is a front view of a case in a hollow fiber membrane module according to an embodiment of the present invention. FIG. 4 is a plan view showing a part of a water collection pipe according to an embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a part of a water collection pipe according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing the mounting structure portion of the hollow fiber membrane module according to the embodiment of the present invention.

Hereinafter, with reference to the drawings, modes for carrying out the present invention will be exemplarily described in detail based on examples. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. .

The hollow fiber membrane module and the mounting structure of the hollow fiber membrane module according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic block diagram of a waste water treatment apparatus according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a hollow fiber membrane module according to an embodiment of the present invention. The case provided in the hollow fiber membrane module according to the present embodiment has a substantially rotationally symmetric shape, and FIG. 2 shows a cross-sectional view of the hollow fiber membrane module cut along a plane including the central axis of the case. FIG. 3 is a front view of a case in a hollow fiber membrane module according to an embodiment of the present invention. FIG. 4 is a plan view showing a part of a water collection pipe according to an embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a part of a water collection pipe according to an embodiment of the present invention, which corresponds to the AA cross-sectional view in FIG. FIG. 6 is a schematic cross-sectional view showing the mounting structure portion of the hollow fiber membrane module according to the embodiment of the present invention. In addition, the water collection pipe in FIG. 6 is corresponded to BB sectional drawing in FIG.

<Waste water treatment equipment>
With reference to FIG. 1, the waste water treatment apparatus which can apply the hollow fiber membrane module which concerns on a present Example is demonstrated. A membrane separation activated sludge method (Membrane Bioreactor (MBR)) is used as the waste water treatment apparatus 10 according to the present embodiment. The waste water treatment apparatus 10 includes a tank 100, a plurality of hollow fiber membrane modules 200 provided in the tank 100, and a water collection pipe 300 for collecting the liquid (water) filtered by the hollow fiber membrane module 200. Waste water (stock solution) is introduced into the tank 100 (see arrow X), and after being purified by the plurality of hollow fiber membrane modules 200, the waste water is discharged from the tank 100 (see arrow Y). The treated water flows from the inside of the tank 100 to the outside of the tank 100 by the power of the pump P. Moreover, in the tank 100, a large amount of microbes for removing pollutants in the waste water are propagated.

<Hollow fiber membrane module>
With reference to FIG. 2, the whole structure of the hollow fiber membrane module 200 which concerns on a present Example is demonstrated. The hollow fiber membrane module 200 according to the present embodiment includes a hollow fiber membrane bundle 210 made of a plurality of hollow fiber membranes, and a case 220 provided at an end of the hollow fiber membrane bundle 210. In the present embodiment, cases 220 are respectively provided at both ends of the hollow fiber membrane bundle 210. As a material of the hollow fiber membrane, PVDF (polyvinylidene fluoride) having high mechanical strength and excellent chemical resistance can be suitably used. Furthermore, a hollow fiber membrane provided with a braid (consisting of a key knitting or a braid) as a support in the hollow interior can be suitably used.

Further, in the hollow fiber membrane module 200 according to the present embodiment, the hollow fiber membranes are sealed and fixed to each other while the hollow inside of each hollow fiber membrane is opened, and the hollow fiber membrane bundle is formed on the inner circumferential surface of the case 220. A sealing fixture 230 is provided which secures the end of 210. The method of manufacturing the sealing and fixing portion 230 is a known technique, and an example thereof will be briefly described here. First, the opening at the tip of each hollow fiber membrane in the hollow fiber membrane bundle 210 is sealed. More specifically, a liquid potting material (urethane or epoxy resin) is applied or dipped (immersed and sealed) around the opening of each hollow fiber membrane. More preferably, a hot melt adhesive is applied or dipped around the opening of each hollow fiber membrane. Then, with the end of the hollow fiber membrane bundle 210 inserted in the case 220, the inside of the case 220 is filled with the liquid potting material. At this time, as described above, since the opening at the tip of each hollow fiber membrane is sealed, the potting material is not sucked into the hollow interior. Then, after the potting material is cured, the end of the case 220, the end of the hollow fiber membrane, and the end of the cured potting material are simultaneously cut. Thus, as described above, the end of the hollow fiber membrane bundle 210 is attached to the case 220 in a state where the hollow interiors of the hollow fiber membranes are opened by the sealing and fixing portion 230 and the hollow fiber membranes are sealed. It is fixed. The case 220 is made of a material having excellent adhesion to the material (potting material) of the sealing and fixing portion 230. For example, when a urethane resin is employed as the potting material, ABS, polyvinyl chloride or the like can be suitably used as the material of the case 220.

Furthermore, in the hollow fiber membrane module 200 according to the present embodiment, at least one (two in the case of the present embodiment) seal rings 240 made of an elastic body are mounted on the outer peripheral surface side of the case 220. The seal ring 240 according to the present embodiment uses an O-ring having a circular cross section. However, the seal ring in the present invention is not limited to the O-ring, and various seal rings such as a square ring having a rectangular cross section can be used.

<Case>
Case 220 will be described in more detail, with particular reference to FIG. Hereinafter, for convenience of explanation, in FIG. 3, the lower side of the case 220 is referred to as a front end side, and the upper side is referred to as a rear end side. The case 220 according to the present embodiment is formed of a rotationally symmetric member except for the portion of the locking projection 223 described below.

Annular mounting grooves

221 and 222 are provided at two positions on the outer peripheral surface of the case 220 according to the present embodiment. Two seal rings 240 are attached to these

attachment grooves

221 and 222, respectively. Further, at least one locking protrusion 223 is provided on the outer peripheral surface side of the case 220 on the rear end side of the mounting

grooves

221 and 222. In the present embodiment, two locking projections 223 are provided at symmetrical positions with respect to the central axis of the case 220. Furthermore, an outward flange portion 224 is provided on the rear end side of the case 220.

<Water collection pipe>
The water collection pipe 300 will be described with reference to FIGS. 4 and 5. The water collection pipe 300 includes a plurality of cylindrical portions 310 and a flow path 320 through which the liquid (water) after being purified (filtered) flows. The inner wall surface of the cylindrical portion 310 becomes an attachment hole 310 a to which the case 220 in the hollow fiber membrane module 200 is attached. Further, in each cylindrical portion 310, a locked portion 311 is provided on the inner peripheral surface side of the mounting hole 310a. In the present embodiment, the engaged portions 311 are provided at two places for one cylindrical portion 310. In the present embodiment, the engaged portion 311 is formed of a through hole. However, the locked portion can also be configured by a groove (recess).

<Mounting structure of hollow fiber membrane module>
The mounting structure of the hollow fiber membrane module 200 according to the present embodiment will be described with reference to FIG. 6 in particular. In the hollow fiber membrane module 200 according to the present embodiment, the case 220 is attached to the attachment hole 310 a of the water collection tube 300. More specifically, with the seal ring 240 attached to the case 220, the case 220 is inserted into the mounting hole 310a from the front end side (lower side in FIG. 6) of the case 220. At this time, the case 220 is inserted into the mounting hole 310a until the surface (positioning portion) 224a on the front end side in the outward flange portion 224 abuts on the front end surface (surface around the mounting hole 310a) in the cylindrical portion 310. . Thereby, positioning of the attachment direction of case 220 is made. In the state in which such positioning is performed, the two locking projections 223 provided on the case 220 are locked to the two engaged portions 311 provided on the cylindrical portion 310, respectively. . Further, an annular gap between the outer peripheral surface of the case 220 and the inner peripheral surface of the mounting hole 310 a is sealed by the seal ring 240.

<The excellent point of the hollow fiber membrane module according to the present embodiment and the mounting structure of the hollow fiber membrane module>
According to the hollow fiber membrane module 200 and the mounting structure of the hollow fiber membrane module 200 according to the present embodiment, the annular gap between the outer peripheral surface of the case 220 and the inner peripheral surface of the mounting hole 310a is an elastic seal ring A configuration sealed by 240 is employed. Accordingly, the sealing performance is stably exhibited, and there is no need to control the amount of the adhesive applied as in the case of adhesion by the adhesive, so that the mounting workability is excellent. Further, since the locking projection 223 provided on the outer peripheral surface side of the case 220 is locked to the locked portion 311 provided on the inner peripheral surface side of the mounting hole 310a, the case 220 is detached from the mounting hole 310a. It can also be suppressed. For example, when the hollow fiber membrane module 200 is used for the above-described waste water treatment apparatus 10, vibration occurs when the waste water treatment apparatus 10 is used, and 100 KPa or more and 200 KPa or less inside the hollow fiber membrane when backwashing is performed. Washed under pressure. Thus, a force acts on the case 220 in the direction of coming out of the mounting hole 310a, but the case 200 may be detached from the mounting hole 310a by the locking projection 223 being locked to the locked portion 311. Is suppressed.

Further, a configuration in which the two seal rings 240 are respectively attached to the two

annular attachment grooves

221 and 222 provided on the outer peripheral surface of the case 220 is adopted. Thereby, since the seal ring 240 is positioned, the posture of each seal ring 240 is stabilized, and the sealing performance by each seal ring 240 is more stably exhibited. Further, since the seal ring 240 may be attached to the

attachment grooves

221 and 222 provided on the outer peripheral surface of the case 220, the attachment operation of the seal ring 240 is easy.

Furthermore, in the case 220 according to the present embodiment, a positioning portion (outwardly facing flange portion 224) where positioning in the mounting direction of the case 220 is performed by abutting against a surface (tip surface of the cylindrical portion 310) around the mounting hole 310a. The surface 224a of the front end side (the lower side in FIGS. 3 and 6) is provided. Thus, the case 220 can be attached easily because the case 220 may be inserted into the mounting hole 310a until the positioning portion provided in the case 220 abuts the surface around the mounting hole. Further, the locking projection 223 can be locked more reliably to the locked portion 311.

(Others)
In the hollow fiber membrane module 200 according to the above embodiment, the configuration in the case where two seal rings 240 are attached is shown. However, in the hollow fiber membrane module of the present invention, the number of seal rings to be attached is not limited, and at least one seal ring may be attached. However, by mounting two or more seal rings 240, even if distortion occurs in the water collection pipe 300 during use, the inclination of the case 220 with respect to the mounting hole 310a can be suppressed, and the sealing performance can be maintained. Can. Moreover, in the hollow fiber membrane module 200 which concerns on a present Example, the structure in case two locking projections are provided in case 220 was shown. However, in the hollow fiber membrane module of the present invention, the number of the locking projections provided in the case is not limited, and at least one locking projection may be provided.

DESCRIPTION OF SYMBOLS 10 Waste water treatment apparatus 100 Tank 200 Hollow fiber membrane module 210 Hollow fiber membrane bundle 220

Case

221, 222 Attachment groove 223 Locking projection 224 Outward flange part 224a Surface 230 Sealing fixing part 240 Seal ring 300 Water collecting pipe 310 Cylindrical part 310a attachment Hole 311 Locked part 320 Flow path P pump

Claims

In a hollow fiber membrane module attached to a mounting hole provided in a pipe for collecting filtered liquid,
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
A hollow fiber membrane module in which the case is attached to the attachment hole,
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole A hollow fiber membrane module comprising at least one locking projection which is locked to a locked portion provided on an inner peripheral surface side of the hollow fiber membrane module.
The hollow fiber membrane module according to claim 1, wherein the at least one elastic seal ring is mounted in an annular mounting groove individually provided on an outer peripheral surface of the case.
The hollow fiber membrane module according to claim 1 or 2, wherein the case is provided with a positioning portion which positions the mounting direction of the case by abutting on a surface around the mounting hole. .
In the hollow fiber membrane module mounting structure to a mounting hole provided in a pipe for collecting the liquid filtered by the hollow fiber membrane module,
The hollow fiber membrane module is
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole A hollow fiber membrane module mounting structure characterized in that at least one locking projection to be locked to a locked portion provided on the inner peripheral surface side of is provided.
The hollow fiber membrane module mounting structure according to claim 4, wherein the at least one elastic seal ring is mounted in an annular mounting groove individually provided on the outer peripheral surface of the case. .
The hollow fiber membrane module according to claim 4 or 5, wherein the case is provided with a positioning portion which positions the mounting direction of the case by abutting on a surface around the mounting hole. Mounting structure.
A tank in which a large amount of microorganisms are propagated inside;
A plurality of hollow fiber membrane modules provided in the tank;
A collection pipe for collecting the liquid filtered by each of the plurality of hollow fiber membrane modules;
Waste water treatment equipment using a membrane separation activated sludge method comprising
A plurality of hollow fiber membrane modules are respectively attached to a plurality of attachment holes provided in the water collection tube,
Each hollow fiber membrane module is
A hollow fiber membrane bundle comprising a plurality of hollow fiber membranes,
A case provided at an end of the hollow fiber membrane bundle;
A sealing and fixing portion for sealing and fixing the hollow fiber membranes while opening the hollow interior of each hollow fiber membrane, and fixing an end of the hollow fiber membrane bundle to the inner circumferential surface of the case;
Equipped with
At least one elastic seal ring for sealing an annular gap between the outer peripheral surface of the case and the inner peripheral surface of the mounting hole is mounted on the outer peripheral surface side of the case, and the mounting hole A waste water treatment apparatus comprising: at least one locking projection which is locked to a locked portion provided on the inner peripheral surface side of the water supply device.
8. The waste water treatment device according to claim 7, wherein the at least one elastic seal ring is mounted in an annular mounting groove individually provided on the outer peripheral surface of the case.
The drainage treatment apparatus according to claim 7 or 8, wherein the case is provided with a positioning portion which positions the mounting direction of the case by abutting on a surface around the mounting hole.