JP2000015063A - Spiral type membrane element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral type membrane element capable of being dismantled easily and composed of members each of which can be disposed of or recycled. SOLUTION: A spiral-form membrane element 1 is constituted by superposing separation membranes on both faces of a permeating liquid flow passage material and bonding three sides so as to form an envelope-like membrane, mounting an opening part of the envelope-like membrane on a water collection pipe 5 and winding the membrane together with a raw liquid flow passage material on an outer peripheral surface of the water collecting pipe 5. A rubber packing is secured to an outer peripheral surface of the spiral-form membrane element 1, and a gap between an inner peripheral surface of an outer member 11a covering the outer peripheral surface of the spiral-form membrane element 1 and an outer peripheral surface of the spiral-form membrane element 1 is sealed in a liquid-tight manner. Further, a first anti-telescope 11a and a second anti- telescope 11b are mounted on both end faces of the outer member 11a by screws so as to form a spiral type membrane type element 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral membrane element used for separating components in a fluid.

[0002]

2. Description of the Related Art Separation membrane technology is used for desalination of seawater and desalination of seawater in response to water shortage, production of ultrapure water in the electronics industry and the pharmaceutical field, reuse of wastewater, and furthermore in food, medicine and fine chemicals. It is used for various purposes such as separation, production and concentration.

[0003] In recent years, microfiltration membrane modules and ultrafiltration membrane modules have been used in tap water purification processes, and reverse osmosis membrane modules have been used in seawater desalination. In such a field, the amount of the separation membrane module used is increasing due to the large processing capacity. On the other hand, the use of the separation membrane module has been expanding in a wide range of fields including the semiconductor industry, and the need for the separation membrane module is expected to further increase.

Various types of membrane modules such as a spiral type, a hollow fiber type, a plate-and-frame type, a rotating flat type, and a flat type laminated type are available as such a membrane module for filtration. Module exists. Among them, the spiral-wound membrane module uses a sheet-like separation membrane whose active thinning is relatively easy, and has an advantage that it is excellent in pressure resistance and can be manufactured relatively inexpensively. Therefore, the usage is expected to increase further in the future.

[0005] The spiral membrane module has a spiral membrane element housed in a pressure vessel. The spiral-wound membrane element is contaminated with a removal substance with use, and the separation performance (permeability and removal capacity) is reduced.
The performance is restored by performing physical or chemical cleaning using backwashing or the like.However, the recovery performance gradually decreases, and the service life lasts several years at the longest. Becomes

FIG. 6 shows an axial sectional view of a conventional spiral-type membrane element. The spiral membrane element 1 forms an envelope-like membrane by laminating a separation membrane on both sides of a permeate flow path material and bonding three sides thereof, and the opening of the envelope-like membrane is formed by a perforated hollow tube. Attached to the water collecting pipe 5, it is formed by spirally winding the outer peripheral surface of the water collecting pipe together with the net-shaped raw liquid flow path material. Anti-telescopes 11 are attached to both end faces of the spiral membrane element 1, and an epoxy resin containing glass fiber is applied on the outer peripheral face of the spiral membrane element 1 so that the outer peripheral face of the spiral membrane element 1 becomes an FRP shell. Covered with 10.

[0007] Therefore, it is difficult to dispose of the used spiral membrane element and reuse or discard it for each member according to the state of each member. Further, when the used spiral type membrane element is disassembled, separated and discarded, it requires enormous labor and leads to an increase in product cost.

[0008]

However, as described above, it is expected that the usage of the spiral-type membrane module will further increase in the future, and that a large amount of used spiral-type membrane elements will be generated. In recent years, attention has been paid to the preservation of the global environment, and it is desired to develop a spiral-type membrane element that can be easily disassembled and reused or disposed of for each member.

An object of the present invention is to provide a spiral membrane element which can be easily disassembled and can be reused or discarded for each member.

[0010]

The spiral membrane element according to the present invention comprises a spiral membrane element in which a permeable membrane is wound around the outer peripheral surface of a perforated hollow tube, An outer package constituted by a cylindrical portion covering the outer peripheral surface and first and second end face closing portions for closing both end surfaces of the spiral membrane element, wherein the outer package is separable into a plurality of portions and the spiral membrane is provided. It is configured to be removable from the element.

[0011] In the spiral membrane element according to the present invention, it is possible to remove the outer casing from the spiral membrane element by separating it into a plurality. Thereby, it is possible to reuse or discard each member of the exterior body and the spiral membrane element.

[0012] The first and second end face closing portions may be configured to be separable from the cylindrical portion. In this case, the spiral membrane element can be taken out from any one of both end surfaces of the cylindrical portion of the outer package.

A first screw portion is formed at both ends of the cylindrical portion, and a second screw portion to be screwed to the first screw portion of the cylindrical portion is formed at the first and second end face closing portions. Good. In this case, the exterior body can be separated by the screw portion.

It is preferable that a sealing material is mounted between the outer peripheral surface of the spiral membrane element and the inner peripheral surface of the cylindrical portion of the outer package. A stock solution inlet and a concentrate solution outlet are provided at the first and second end face closing portions, respectively, and a stock solution supplied from the stock solution inlet passes through a permeable membrane and flows into a perforated hollow tube; It is separated into a concentrated liquid discharged from the concentrated liquid outlet without passing through the permeable membrane. The separation operation can be performed efficiently by separating the undiluted solution and the concentrated solution with the sealing material so as not to mix.

The sealing material is formed from an annular fastening portion which is fastened to the outer peripheral surface of the spiral membrane element and an annular projecting portion which gradually becomes thinner in an oblique outer circumferential direction from one end face of the annular fastening portion toward the stock solution supply side. May be. The outer periphery of the distal end portion of the annular projecting portion comes into liquid-tight contact with the inner peripheral surface of the cylindrical portion, and seals the space between the undiluted solution side and the concentrated solution side. In this case, as the pressure difference between the stock solution side space and the concentrated solution side space sandwiching the annular protrusion increases, the annular protrusion deforms so that the contact area with the inner peripheral surface of the cylindrical portion increases. Thereby, the sealing property is enhanced.

Preferably, the sealing material is made of rubber.
Thereby, the sealing property and the deformability of the sealing member are improved.

[0017] A minute hole may be provided in the sealing material.
As a result, the liquid flows into the space sandwiched between the outer peripheral surface of the spiral membrane element and the inner peripheral surface of the cylindrical portion of the outer package. As a result, deterioration of the liquid quality due to the retention of the liquid is prevented.

[0018] The sealing material may be made of a hot melt resin. Hot-melt resin is easy to handle because of its good handleability. Further, since the hot melt resin is melted by heating, disassembly becomes easy.

The sealing member may be made of a foam sheet. In this case, a dead space is not formed between the outer peripheral surface of the spiral membrane element and the inner peripheral surface of the cylindrical portion of the exterior body by the foamed sheet, and the liquid quality does not deteriorate.

A stock solution inlet and a concentrate solution outlet may be provided at the first and second end face closing portions, respectively. As a result, the stock solution supplied from the stock solution inlet of the first end face blocking portion flows into the inside of the spiral membrane element from one end face of the spiral membrane element, and is then separated into a concentrate and a permeate, and is concentrated. The liquid flows out from the other end face of the spiral membrane element, and is discharged from the concentrated liquid outlet of the second end face closing portion.

[0021]

FIG. 1 is an axial sectional view of a spiral type membrane element according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a rubber packing in the spiral membrane element of FIG. FIG. 3 is a partially cutaway perspective view of the spiral membrane element in the spiral membrane element.

First, as shown in FIG. 3, the spiral membrane element 1 forms an envelope membrane 4 by superimposing separation membranes 2 on both surfaces of a permeate flow channel material 3 and bonding three sides thereof. The opening of the envelope-shaped membrane 4 is attached to a water collecting pipe 5 composed of a perforated hollow pipe, and is spirally wound around the outer peripheral surface of the water collecting pipe 5 together with the raw liquid flow path material 6.

As shown in FIG. 1, the spiral membrane element 1
Rubber packing 12 on the outer peripheral surface near the undiluted-side end surface 16a.
Is fastened. As shown in FIG. 2, the rubber packing 12 is connected to the annular fastening portion 12a and one end face of the annular fastening portion 12a from the undiluted solution side face 1 of the spiral membrane element 1 of FIG.
An annular protruding portion 12b that becomes gradually thinner in the oblique outer peripheral direction toward 6a is integrally formed.

As shown in FIG. 1, the spiral membrane element 1 to which the rubber packing 12 is attached is inserted into a cylindrical exterior member 10a. The axial length of the exterior material 10a is the same as that of the spiral membrane element 1, and the exterior material 10a
Male threads are formed at both ends of the outer peripheral surface of the. Also,
The outer periphery of the distal end of the annular protrusion 12b of the rubber packing 12 is in liquid-tight contact with the inner peripheral surface of the exterior material 10a.

The exterior material 10a may be made of a metal material such as stainless steel, a composite material such as FRP (glass fiber reinforced plastic), PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PPE (polyphenylene). Ether), modified PPE
Plastics such as (modified polyphenylene ether), PVC (polyvinyl chloride), and ABS (copolymer of acrylonitrile, butadiene, and styrene).

The material of the rubber packing 12 is as follows.
BR (butadiene rubber), SBR (styrene butadiene rubber), NBR (nitrile rubber), EPDM (ethylene propylene rubber), silicone rubber, viton, and the like.

At both ends of the exterior material 10a, a first anti-telescope 11a for covering the stock solution side end face 16a of the spiral membrane element 1 and the end of the exterior material 10a, and the concentrated solution side end face 1
6b and a second anti-telescope 11b that covers the ends of the exterior material 10a are attached. This allows
The spiral type membrane element 100 is formed.

The first anti-telescope 11a is formed by integrally forming a disk portion covering the spiral membrane element 1 and the end face of the exterior material 10a and a cylindrical portion covering the outer periphery of the end of the exterior material 10a. A female screw is formed on the inner peripheral surface of the cylindrical portion of the first anti-telescope 11a. 1st anti-telescope 11
In the center of the disc portion a, a hole is provided through which the end of the water collecting pipe 5 penetrates. A raw liquid inlet 14a is formed around the hole, and a sealing material is attached to the outer peripheral surface of the disc portion. Grooves are provided.

On the other hand, the second anti-telescope 11b
The disk part covering the spiral membrane element 1 and the end face of the exterior material 10a and the cylindrical part covering the outer periphery of the end part of the exterior material 10a are integrally formed. And the second anti-telescope 11
On the inner peripheral surface of the cylindrical portion b, a female screw to be screwed to the male screw at the end of the exterior material 10a is formed. At the center of the disc portion of the second anti-telescope 11b, a hole is provided through which the end of the water collecting pipe 5 penetrates.
b is formed.

The first anti-telescope 11a and the second anti-telescope 11b are made of a metal material such as stainless steel, a composite material such as FRP, PE, P or the like.
Plastics such as P, PET, PPE, modified PPE, PVC, and ABS resin are exemplified.

In this embodiment, the exterior material 10a, the first anti-telescope 11a and the second
b constitutes an exterior body.

The spiral type membrane element 100 shown in FIG.
Is stored in a pressure vessel (not shown) during operation. The stock solution 7 is supplied to the stock solution inlet 14a of the first anti-telescope 11a, and flows in the axial direction along the stock solution flow path material 6, as shown in FIG. In the process, the permeated liquid 8 that has passed through the separation membrane 2 flows along the permeated liquid flow path material 3 and flows into the inside of the water collecting pipe 5 through a hole provided on the outer peripheral surface of the water collecting pipe 5.
It is discharged from the end of the water collecting pipe 5. On the other hand, the undiluted liquid 7 that has not passed through becomes the concentrated liquid 9 and is discharged from the concentrated liquid outlet 14b of the second anti-telescope 11b shown in FIG.

The annular protruding portion 12b of the rubber packing 12 has a structure opened in the upstream direction of the stock solution 7. For this reason,
The stock solution-side space 15 in which the stock solution 7 flows and sandwiches the annular protrusion 12b
a and the concentrated solution side space 15b generate a pressure difference due to pressure loss, so that the annular protrusion 12b is
Is deformed so as to increase the contact area with the inner peripheral surface. Thereby, the sealing property is enhanced.

Used Spiral Membrane Element 10
0, the first anti-telescope 11a or the second
If the anti-telescope 11b is removed from the exterior material 10a, the spiral membrane element 1 can be easily extracted.

The first anti-telescope 11a, the second anti-telescope 11b and the exterior material 10a can be reused, and each member and the packing 12 constituting the spiral membrane element 1 are disassembled for each member. Spiral type membrane element 1
The reusability of the 00 member can be greatly improved.

If a dead space is formed between the outer peripheral surface of the spiral membrane element 1 and the inner peripheral surface of the exterior material 10a, and there is a concern that the liquid quality may be degraded due to stagnation of the liquid,
By providing a small hole in the rubber packing 12, a part of the stock solution 7 may flow from the stock solution side space 15a to the concentrated solution side space 15b.

Further, in the spiral membrane element 100 of the present embodiment, compared with the conventional method in which an FRP resin such as an epoxy resin containing glass fiber is applied to the outer peripheral surface of the spiral membrane element 1, the curing time is longer. And assembly, disassembly and separation can be simplified, and the assembling work environment can be improved.

FIG. 4 is an axial sectional view of a spiral-type membrane element according to a second embodiment of the present invention. In this embodiment, a hot melt resin 13 is used instead of the rubber packing 12 in the first embodiment.

The spiral membrane element 1 is inserted into the exterior material 10a, and the space between the inner peripheral surface of the exterior material 10a on the stock solution inlet 14a side and the outer peripheral surface of the spiral membrane element 1 is liquid-tight by the hot melt resin 13. Fill in.

Examples of the material of the hot melt resin 13 include synthetic rubbers whose main components are ethylene vinyl acetate copolymer, polyamide, polyester and atactic polypropylene.

Exterior material 10a, first anti-telescope 1
The configurations and materials of the first and second anti-telescopes 11b are the same as those of the first embodiment. The flow of the stock solution 7, the permeate solution 8 and the concentrated solution 9 during operation of the spiral membrane element 100 is the same as in the first embodiment.

Used spiral type membrane element 10
0, the first anti-telescope 11a or the second
If the anti-telescope 11b is removed from the exterior material 10a, the spiral membrane element 1 can be easily extracted.

The first anti-telescope 11a, the second anti-telescope 11b, and the exterior material 10a can be reused, and each member constituting the spiral membrane element 1 and the hot melt resin 13 are provided separately for each member. Since it can be disassembled and reused or disposed of, the reusability of the members of the spiral membrane element 100 can be greatly improved.

The hot-melt resin has good handleability, so that it is easy to assemble. Further, since the hot melt resin is melted by heating, disassembly becomes easy.

Further, as compared with the conventional method in which an FRP resin such as an epoxy resin containing glass fiber is applied to the outer peripheral surface of the spiral membrane element 1, there is no need to wait for the curing time, and assembly, disassembly and separation can be easily performed. , The assembly work environment can be improved.

FIG. 5 is an axial sectional view of a spiral-type membrane element according to a third embodiment of the present invention. In this embodiment, a foam sheet 17 is used instead of the rubber packing 12 of the first embodiment and the hot melt resin 13 of the second embodiment.
Is used.

The spiral membrane element 1 in which the foamed sheet 17 made of rubber is wound around the outer peripheral surface is inserted into the exterior material 10a, and heated to heat the inner peripheral surface of the exterior material 10a and the outer periphery of the spiral membrane element 1. The space between the surfaces is filled with a foam sheet 17 in a liquid-tight manner. The width of the foam sheet 17 is the same as the length of the spiral membrane element 1 in the axial direction.

The material of the foam sheet 17 is PE, P
P, polyurethane, polystyrene and the like.

Exterior material 10a, first anti-telescope 1
The configurations and materials of the first and second anti-telescopes 11b are the same as those of the first embodiment. The flow of the stock solution 7, the permeate solution 8 and the concentrated solution 9 during operation of the spiral membrane element 100 is the same as in the first embodiment.

Used spiral type membrane element 10
0, the first anti-telescope 11a or the second
If the anti-telescope 11b is removed from the exterior material 10a, the spiral membrane element 1 can be easily extracted.

The first anti-telescope 11a, the second anti-telescope 11b and the exterior material 10a can be reused, and each member constituting the spiral membrane element 1 and the foam sheet 17 are disassembled for each member. The spiral membrane element 100 can be reused or discarded.

Further, as compared with the conventional method in which an FRP resin such as an epoxy resin containing glass fiber is applied to the outer peripheral surface of the spiral membrane element 1, there is no need to wait for the curing time, and assembly, disassembly, and separation can be easily performed. , The assembly work environment can be improved.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a spiral-wound membrane element according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a rubber packing in the spiral membrane element of FIG.

FIG. 3 is a partially cutaway perspective view of the spiral membrane element in the spiral membrane elements of FIGS. 1, 4, 5 and 6;

FIG. 4 is an axial cross-sectional view of a spiral-type membrane element according to a second embodiment of the present invention.

FIG. 5 is an axial sectional view of a spiral-type membrane element according to a third embodiment of the present invention.

FIG. 6 is an axial sectional view of a conventional spiral-type membrane element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral membrane element 5 Water collecting pipe 7 Undiluted solution 10a Exterior material 11a 1st anti-telescope 11b 2nd anti-telescope 12 Rubber packing 12a Annular fastening part 12b Annular protrusion 13 Hot melt resin 14a Undiluted solution inlet 14b Concentrate outlet 17 Foaming Sheet

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D006 GA03 GA06 GA07 HA62 JA23A JA24A JA27A JB07 JB11 JB13 JB20 MA03 PB02 PB03 PB07 PB08 PC01 PC02 PC11 PC42 PC80

Claims (10)

[Claims] 1. A spiral membrane element in which a permeable membrane is wound around an outer peripheral surface of a perforated hollow tube, a cylindrical portion covering the outer peripheral surface of the spiral membrane element, and both end surfaces of the spiral membrane element are closed. A spiral body comprising a first and a second end surface closing portion, wherein the outer body is configured to be separable into a plurality of portions and detachable from the spiral membrane element. Mold membrane element. 2. The spiral membrane element according to claim 1, wherein the first and second end face closing portions are configured to be separable from the cylindrical portion. 3. A first screw formed at both ends of the cylindrical portion, and a second screw screwed to the first screw portion of the cylindrical portion at the first and second end face closing portions. The spiral membrane element according to claim 2, wherein a portion is formed. 4. A sealing material is provided between an outer peripheral surface of the spiral membrane element and an inner peripheral surface of the cylindrical portion of the exterior body. Spiral membrane element. 5. An annular fastening portion fastened to an outer circumferential surface of the spiral membrane element, and the sealing material is gradually thinner in an oblique outer circumferential direction from one end face of the annular fastening portion toward a stock solution supply side. 5. The spiral-type membrane element according to claim 4, comprising an annular projection. 6. The spiral type membrane element according to claim 4, wherein said sealing material is made of rubber. 7. The spiral-type membrane element according to claim 4, wherein minute holes are provided in the sealing material. 8. The spiral-type membrane element according to claim 4, wherein said sealing material is made of a hot melt resin. 9. The spiral-type membrane element according to claim 4, wherein said sealing member is made of a foam sheet. 10. The spiral membrane element according to claim 1, wherein a stock solution inlet and a concentrate solution outlet are provided in the first and second end face closing portions, respectively.