JPH11179165A - Membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily exchange filtration membrane sheets by integrally forming filtration membrane sheet in a bag-like shape with and internally installing a frame substrate in non-fixed state regarding a membrane module constituted by installing filtration membrane sheets in both faces of a frame substrate and forming a discharge outlet in a space surrounded with the frame substrate and the filtration membrane sheets. SOLUTION: This membrane module to be preferably used for a wastewater septic tank such as a small and combined type wastewater septic tank for domestic use comprises filtration membrane sheets 2 installed in both faces of a frame substrate 1. That is, the filtration membrane sheets 2 are formed into a bag-like shape and the frame substrate 1 is internally installed in the filtration membrane sheets 2 in non-fixed state. A membrane hole 6 is formed near the folded part of the filtration membrane sheets 2 and the membrane hole 6 is used as a discharge outlet 3. On the other hand, a through hole 7 communicating with the membrane hole 6 is formed in the frame substrate 1 and a discharge pipe 8 is internally installed while being inserted into the membrane hole 6 and the through hole 7. The peripheral part of the membrane hole 6 of the filtration membrane sheets 2 is pressure-joined to the surface of the frame substrate 1 in the peripheral part of the through hole 7 by pushing pieces 8a of the discharge pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane module for filtering sewage and the like, which is used in a sewage clarification tank such as a household small-sized combined clarification tank.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
No. 0592 has been proposed. This membrane module is configured by attaching filtration membrane sheets 2 to both sides of a frame substrate 1. This filtration membrane sheet 2
Can be attached to the frame substrate 1 by, for example, bonding the filtration membrane sheet 2 to both sides of the frame substrate 1 with an adhesive,
Are fixed to both surfaces of the frame substrate 1 by thermal welding.

[0003]

However, in the conventional examples in which the filtration membrane sheet 2 is attached to the frame substrate 1 by bonding with an adhesive or fixation by heat welding as described above, the manufacturing cost is low. And the filtration membrane sheet 2
Once broken, it becomes difficult to re-fix the filtration membrane sheet 2 to the frame substrate 1 with good hermeticity, and there is a problem that the frame substrate 1 becomes disposable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a membrane module which can be reused without disposable frame substrates by replacing a filtration membrane sheet and which can be easily manufactured. To provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a filtration membrane sheet 2 is provided on both sides of a frame substrate 1 and is surrounded by the frame substrate 1 and the filtration membrane sheet 2. In a membrane module provided with a discharge port 3 that communicates between a closed space and an external space, a filtration membrane sheet 2 is integrally formed in a bag shape, and a frame substrate 1 is mounted inside the filtration membrane sheet 2 in a non-fixed state. It is characterized by the following.

[0006] In such a membrane module, the frame substrate 1 is mounted in a non-fixed state on a bag-shaped filtration membrane sheet 2 to form a membrane module. When a problem occurs in the filtration membrane sheet 2, the frame substrate 1 is taken out from the filtration membrane sheet 2,
A new membrane module is formed by mounting it inside another bag-shaped filtration membrane sheet 2 of a good product.

According to a second aspect of the present invention, in the first aspect of the present invention, the filtration membrane sheet 2 is folded in two at the bent portion 4, and the folded filtration membrane sheet 2 is placed between the two pieces. The filtration membrane sheet 2 is formed in a bag shape by heat-welding the outer edges of the two pieces facing each other around the frame substrate 1 to each other.

In such a membrane module, in a state where the frame substrate 1 is housed between the two pieces of the filter membrane sheet 2 folded in two, the opposing outer edges around the frame substrate 1 in the two pieces are mutually heated. Due to the welding, the filtration membrane sheet 2 can be formed in a bag shape in a state where the filtration membrane sheet 2 is stretched in accordance with the size of the frame substrate 1.

According to a third aspect of the present invention, in the second aspect of the present invention, a rod-shaped mounting member 5 having a groove 5a is provided.
And the groove 5a of the mounting member 5 is fitted to the outer edge of the frame substrate 1 via the heat-welded outer edge of the filtration membrane sheet 2.

In such a membrane module, the mounting member 5 is attached to the outer edge of the frame substrate 1 such that the outer edge of the filter membrane sheet 2 that is thermally welded is sandwiched between the outer edge of the frame substrate 1 and the groove 5a.

According to a fourth aspect of the present invention, in the third aspect of the invention, the end surface of the outer edge of the frame substrate 1 into which the groove 5a of the mounting member 5 is fitted is formed into a gentle curved surface. It is configured as a feature.

In such a membrane module, the outer edge of the frame substrate 1 to which the filtration membrane sheet 2 is pressed is formed into a gentle curved surface. Prevents tearing.

According to a fifth aspect of the present invention, in the second to fourth aspects, a membrane hole 6 is formed near the bent portion 4 of the filtration membrane sheet 2, and the membrane hole 6 is connected to the discharge port 3. The feature is that it becomes.

In such a membrane module, a membrane hole 6 serving as an outlet 3 is previously formed in the bent portion 4 of the filtration membrane sheet 2, and the filtration membrane sheet 2 in which the membrane hole 6 is formed is formed. The outer edge can be easily thermally welded irrespective of the outlet 3.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the frame substrate 1 is provided with a through hole 7 communicating with the membrane hole 6, and the film substrate 6 and the through hole 7 are discharged. Tube 8
And a pressing piece 8a that presses the periphery of the membrane hole 6 in the filtration membrane sheet 2 to the surface of the frame substrate 1 around the through hole 7 in a watertight manner so as to protrude from the outer surface of the discharge pipe 8. It is configured as a feature.

In such a membrane module, the discharge pipe 8 is fitted into the membrane hole 6 and the through hole 7 in a state where the membrane hole 6 and the through hole 7 communicate with each other, and the passage of the discharge pipe 8 is formed as the discharge port 3. At the same time, the pressing piece 8a on the outer surface of the discharge pipe 8 presses the periphery of the membrane hole 6 in the filtration membrane sheet 2 to the surface of the frame substrate 1 around the through hole 7 in a watertight manner.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a membrane module according to an embodiment of the present invention will be described with reference to FIGS.

FIGS. 1A and 1B show a membrane module according to an embodiment of the present invention, wherein FIG. 1A is a front view and FIG. 1B is an enlarged sectional view of a waist. FIG. 2 is an explanatory view showing an example of a method of forming a bag-shaped filtration membrane sheet 2 used in the above membrane module. FIGS. 3A and 3B show a mounting structure of the above-mentioned membrane module to the membrane unit 11, wherein FIG. 3A is a perspective view, and FIGS. 3B and 3C are plan views of main parts. FIG.
FIGS. 2A to 2C are front views showing a frame substrate 1 used in the above film module, and FIGS.
3 is a longitudinal sectional view of a main part of the frame substrate 1 shown in FIG.

As shown in FIGS. 1 to 4, this membrane module has a filtration membrane sheet 2 provided on both sides of a frame substrate 1, and a space surrounded by the frame substrate 1 and the filtration membrane sheet 2 and an external space. Is provided with a discharge port 3 for communicating with. Then, the filtration membrane sheet 2 is integrally formed in a bag shape, and the frame substrate 1 is housed in the filtration membrane sheet 2 in a non-fixed state. In addition, the bag-shaped filter membrane sheet 2 is obtained by bending the expanded filter membrane sheet 2 into two folds at the bent portion 4, and the folded filter membrane sheet 2
The frame substrate 1 is housed between the two pieces, and the opposing outer edges around the frame substrate 1 in the two pieces are formed by heat welding to each other. Further, a membrane hole 6 is formed near the bent portion 4 in the filtration membrane sheet 2, and the membrane hole 6 is used as the outlet 3. Then, a through hole 7 communicating with the membrane hole 6 is provided in the frame substrate 1, a discharge pipe 8 penetrates through the membrane hole 6 and the through hole 7, and a peripheral portion of the membrane hole 6 in the filtration membrane sheet 2 is formed. A pressing piece 8 a that presses against the surface of the frame substrate 1 around the through hole 7 in a watertight manner is provided on the outer surface of the discharge pipe 8. Further, a rod-shaped mounting member 5 having a groove 5a is provided, and the groove 5a of the mounting member 5 is fitted to the outer edge of the frame substrate 1 via the thermally welded outer edge of the filtration membrane sheet 2. The membrane module is arranged in a standing state in the membrane unit 11 with the discharge port 3 positioned upward, and the membrane unit 11 is mounted in the sewage purification tank.

The frame substrate 1 has a rectangular outer shape, and has a rectangular transmission space 15 inside. The through hole 7 of the frame substrate 1 has an opening on one end surface of the frame substrate 1, and communicates the external space of the frame substrate 1 with the transmission space 15.

The bag-like filtration membrane sheet 2 is called a precision membrane, and is formed of, for example, a polyolefin resin.
Innumerable fine holes are formed. The filtration membrane sheet 2 is formed with a thickness of about 50 to 100 μm and a pore diameter of about 0.1 μm as a guide, but is not necessarily limited thereto. The size of the internal space of the filtration membrane sheet 2 is substantially the same as the outer shape of the frame substrate 1, and the filtration membrane sheet 2 maintains a taut state when the frame substrate 1 is installed. Further, the membrane hole 6 of the filtration membrane sheet 2 is
Are provided at positions communicating with the through holes 7, and have substantially the same size as the openings of the through holes 7.

The discharge pipe 8 has a cylindrical discharge pipe main body 8b whose outer diameter is substantially the same as the inner diameter of the through hole 7, and a donut plate-like protruding integrally formed on the outer periphery of a substantially central portion in the longitudinal direction of the discharge pipe main body 8b. And the pressing piece 8a. A screw portion 8c is formed on the outer periphery of the lower portion of the discharge pipe main body 8b. Further, a screw fitting portion 7a into which the screw portion 8c of the discharge pipe main body 8b is screwed is formed on the inner periphery below the through hole 7 of the frame substrate 1. Frame substrate 1 around lower surface of pressing piece 8a and through hole 7 facing pressing piece 8a
A water blocking member 10 such as a rubber packing is provided on the upper end surface.

The mounting member 5 is a frame substrate 1 having an outlet 3
It is attached to the end of three pieces except one piece, and has a substantially U-shaped cross section with respect to the longitudinal direction. The membrane unit 11 is formed in a rectangular shape with open upper and lower ends. Further, a membrane module holding section 12 for holding the membrane module in an upright state is provided on the facing surface of the membrane unit 11. The membrane module holding part 12 is formed by arranging prisms on the inner surface of the membrane unit 11 at substantially constant intervals in the vertical direction.
The gap between the adjacent prisms has a width that allows the mounting member 5 of the membrane module to be fitted and held.

As shown in FIG. 4, the frame substrate 1 is not limited to the frame-shaped substrate having the transmission space 15 described above, and various substrates may be used. For example, as shown in FIG.
A plurality of through holes 16 penetrating the front and back surfaces of the frame substrate 1 are provided, and a communication hole 14 communicating with the discharge port 3 is provided on the inner surface of each through hole 16. (B), (d)
As shown in (1), there is an example in which a water guide groove 13 is provided on the front and back surfaces of the frame substrate 1 to the vicinity of the outlet 3 and a communication hole 14 is provided near the outlet 3 and communicates with the outlet 3.

In such a membrane module, the membrane module is formed by mounting the frame substrate 1 in the bag-like filtration membrane sheet 2. When a problem occurs in the filtration membrane sheet 2, the frame substrate 1 is taken out from the filtration membrane sheet 2 and is installed in another non-defective bag-shaped filtration membrane sheet 2 to form a new membrane module. In addition, the filtration membrane sheet 2 folded in two
In the state in which the frame substrate 1 is stored between the two pieces, the opposite outer edges around the frame substrate 1 in the two pieces are thermally welded to each other. It can be formed in a bag shape while being stretched. Further, a membrane hole 6 serving as an outlet 3 is previously formed in the bent portion 4 of the filtration membrane sheet 2, and the outer edge of the filtration membrane sheet 2 in which the membrane hole 6 is formed is related to the outlet 3. It can be easily welded without heat. A discharge pipe 8 is inserted into the membrane hole 6 and the through-hole 7 in a state where the membrane hole 6 and the through-hole 7 are communicated with each other to form a passage of the discharge pipe 8 as the discharge port 3 and an outer surface of the discharge pipe 8. Pressing piece 8
a presses the periphery of the membrane hole 6 in the filtration membrane sheet 2 to the surface of the frame substrate 1 around the through hole 7 in a watertight manner. Further, the mounting member 5 is attached to the frame substrate 1 such that the heat-sealed outer edge of the filtration membrane sheet 2 is sandwiched between the outer edge of the frame substrate 1 and the groove 5a.
Attach to the outer edge.

FIG. 5 is a perspective view showing a membrane module different from that of the above embodiment of the present invention.

As shown in FIG. 5, this membrane module is formed in substantially the same shape as the above membrane module. The difference is that the end surface of the outer edge of the frame substrate 1 in which the groove 5a of the mounting member 5 is fitted is formed in a gentle curved surface.

In such a membrane module, since the outer edge of the frame substrate 1 to which the filtration membrane sheet 2 is pressed is formed into a gentle curved surface, the filtration membrane sheet is brought into contact with the edge of the outer edge of the frame substrate 1. 2 is prevented from being torn.

The membrane module shown in FIGS. 1 to 5 is used as a filtration membrane device in a small-sized combined treatment tank or the like by the membrane separation activated sludge method, and is provided with a treatment tank such as an aeration tank (not shown). ), A membrane unit 11 having a plurality of membrane modules arranged side by side is arranged, an air diffuser (not shown) is arranged below the membrane unit 11, and the outlet 3 of the membrane module is connected to a drain pipe (not shown). A pump (not shown) is provided in the drain pipe. Then, the wastewater in the treatment tank is aerated by the aeration gas blown out from the air diffuser between the membrane modules, and is purified. In addition, by operating a pump connected to the drain pipe, the sewage purified by the purification treatment is finely filtered by the filtration membrane sheet 2 of the membrane module, enters a portion surrounded by the frame substrate 1 and the filtration membrane sheet 2, and is discharged. 3 is discharged. On the other hand, the sludge adhering to the membrane surface of the filtration membrane sheet 2 by the filtration is desorbed from the membrane surface by an ascending flow generated by the air lift action of the bubbles of the aeration gas rising between the membrane modules.

[0030]

According to the first aspect of the present invention, since the filtration membrane sheet is integrally formed in a bag shape, and the frame substrate is housed in the filtration membrane sheet in a non-fixed state, the filtration membrane sheet is replaced. As a result, the frame substrate can be reused without disposable, which is economical.

According to the second aspect of the present invention, in a state in which the frame substrate is housed between the two pieces of the filter membrane sheet folded in two, the opposing outer edges around the frame substrate in the two pieces are heated with each other. Because of the welding, the filtration membrane sheet can be formed in a tight state in accordance with the size of the frame substrate, and the water tightness of the membrane module is improved.

In the third aspect of the present invention, since the heat-sealed outer edge of the filter membrane sheet is sandwiched between the outer edge of the frame substrate and the groove, the heat-welded portion of the filter membrane sheet which is easily broken is formed. In addition to being able to protect, it is possible to prevent the filtration membrane sheet from being broken by attaching the membrane module with the attachment member.

According to the fourth aspect of the present invention, since the outer edge of the frame substrate to which the filtration membrane sheet is pressed is formed into a gentle curved surface, the edge of the outer edge of the frame substrate is touched and the filtration membrane sheet is touched. Is prevented from breaking.

According to the fifth aspect of the present invention, since the membrane hole serving as the discharge port 3 can be formed in advance in the bent portion of the filtration membrane sheet, the outer edge of the filtration membrane sheet having the membrane hole formed therein is exhausted. Thermal welding can be easily performed regardless of the outlet 3.

In the invention according to claim 6, when the discharge pipe is fitted in the membrane hole and the through hole, the pressing piece water-tightly seals the periphery of the membrane hole in the filtration membrane sheet to the surface of the frame substrate around the through hole. Because of the pressure contact, the filtration performance is improved.

[Brief description of the drawings]

FIG. 1 shows a membrane module according to an embodiment of the present invention,
(A) is a front view, (b) is an enlarged sectional view of a waist.

FIG. 2 is an explanatory view showing an example of a method for forming a bag-shaped filtration membrane sheet used in the above membrane module.

3A and 3B show a mounting structure of the above membrane module to a membrane unit, wherein FIG. 3A is a perspective view, and FIGS. 3B and 3C are plan views of main parts.

FIGS. 4A to 4C are front views showing a frame substrate used in the above-described membrane module, and FIGS.
3 is a longitudinal sectional view of a main part of the frame substrate shown in FIG.

FIG. 5 is a perspective view showing a membrane module different from the above in the embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of a conventional membrane module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame board 2 Filtration membrane sheet 3 Discharge port 4 Bending part 5 Mounting member 5a Groove part 6 Membrane hole 7 Through hole 7a Screw fitting part 8 Discharge pipe 8a Pressing piece 8b Discharge pipe main body 8c Screw part 10 Water stop member 11 Membrane unit 12 membrane module holding part 13 water guide groove 14 communication hole 15 permeation space 16 permeation hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Minami 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. 72) Inventor Shigeyuki Yamaguchi 1048 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Works, Ltd.

Claims (6)

[Claims] 1. A membrane module comprising: a filtration membrane sheet provided on both sides of a frame substrate; and a discharge port 3 for communicating a space surrounded by the frame substrate and the filtration membrane sheet with an external space. Is formed integrally in a bag shape, and a frame substrate is mounted inside the filtration membrane sheet in a non-fixed state. 2. A filter membrane sheet is folded in two at a bent portion, a frame substrate is housed between both pieces of the folded filter membrane sheet, and opposed outer edges around the frame substrate in both pieces. 2. The membrane module according to claim 1, wherein the filtration membrane sheet is formed into a bag-like shape by heat-welding to each other. 3. A rod-shaped mounting member having a groove is provided, and the groove of the mounting member is fitted to the outer edge of the frame substrate via the heat-welded outer edge of the filter membrane sheet. The membrane module according to claim 2. 4. The membrane module according to claim 3, wherein the end surface of the outer edge of the frame substrate in which the groove of the mounting member is fitted is formed into a gentle curved surface. 5. The membrane module according to claim 2, wherein a membrane hole is formed in the vicinity of the bent portion of the filtration membrane sheet, and the membrane hole serves as an outlet 3. 6. A frame substrate is provided with a through-hole communicating with the membrane hole,
A discharge pipe penetrates through the membrane hole and the through-hole, and a press piece that presses the periphery of the membrane hole of the filtration membrane sheet to the surface of the frame substrate around the through-hole in a watertight manner protrudes from the outer surface of the discharge pipe. The membrane module according to claim 5, which is provided.