JPH09201518A - Membrane unit having aeration tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane unit having aeration tubes which are so improved as to lead air bubbles evenly to spaces between respectively neighboring permeative membrane modules. SOLUTION: A membrane unit 20 is formed by arranging a plurality of permeative membrane modules 21 parallel to each other, installing back boards 29 in both sides of the permeative membrane module arranged body, and fixing the permeative membrane modules 21 and the back boards 29 by pipes 22A, 22B which penetrate the permeative membrane modules 21 and the back boards 29 and nuts 23 screwed in the pipes 22A, 22B. Cut parts 28 are formed in respective lower sides of the permeative membrane modules 21 and the back boards 29. Membrane modules 20 to which side plates 33 are attached are lowered toward aeration tubes 35 and the aeration tubes 35 are joined with the cut parts 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane module immersed in a septic tank or the like, and more particularly to a membrane module having a plurality of flat plate-shaped permeable membrane modules arranged in parallel. More specifically, the present invention relates to a membrane unit having an air diffuser improved so that bubbles are uniformly supplied between the permeable membrane modules.

[0002]

2. Description of the Related Art A septic tank in which a plurality of permeable membranes are suspended and arranged in parallel in a tank is described in JP-A-6-71279. FIG. 7 shows the septic tank of the same publication.
An introduction chamber 1, processing chambers 2, 3, 4, a disinfection chamber 5 and the like are provided. In this processing chamber 4, a membrane unit 7 is installed, which is formed by arranging a plurality of flat plate permeable membrane modules 6 in parallel. An air diffuser 8 is installed below the membrane unit 7, and bubbles ejected from the air diffuser 8 are configured to rise between the permeable membrane modules 6.

[0003]

In the conventional membrane module in which the air diffusing tube 8 is arranged below the permeable membrane module 6, when the foreign matter partially adheres to the lower end of the permeable membrane module 6, the air diffusing tube is The air bubbles from No. 8 did not evenly enter between the permeable membrane modules.

It is an object of the present invention to provide a membrane unit having an improved diffusing tube so that air bubbles are uniformly introduced into the space between the permeable membrane modules.

[0005]

Means for Solving the Problems The membrane module of the present invention is a membrane unit in which a plurality of flat plate-shaped permeable membrane modules are arranged in parallel and the plate surfaces of the respective permeable membrane modules are arranged in the vertical direction. And an air diffuser for supplying air bubbles between the permeable membrane modules of the membrane unit, the air outlet of the air diffuser is between the permeable membrane modules, and It is characterized in that it is arranged at a position above the lower end of the permeable membrane module.

In such a membrane module, the air outlet of the air diffuser is arranged between the permeable membrane modules,
The bubbles from the outlet are supplied as they are between the permeable membrane modules. Therefore, even if foreign matter adheres to the lower end of the permeable membrane module, the bubbles are evenly supplied between the permeable membrane modules.

In the present invention, it is preferable that a cutout is provided on the lower side of each permeable membrane module, and the air diffuser extends through the cutout in a direction substantially perpendicular to the plate surface of the permeable membrane module.

According to this structure, the membrane module and the air diffusing tube can be combined by simply lowering the membrane module by engaging the notch of the membrane module with the air diffusing tube and lowering the membrane module upward. The membrane module can be separated from the air diffuser simply by pulling it up to.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a membrane unit having an air diffusing tube according to an embodiment, FIG. 2 is an assembly explanatory view thereof, and FIG. 3 is a longitudinal sectional view of a permeable membrane module (II in FIG. 2).
(Sectional view taken along line I-III), FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. 5 is a sectional view showing the structure of the water collecting pipe, FIG.
The figure is a cross-sectional view showing a hooked state of the side plate.

In the membrane unit 20 having the air diffusing tube, a plurality of permeable membrane modules 21 are arranged in parallel and back plates 29 are arranged at both ends in the stacking direction, and the permeable membrane modules 21 and the back plate 29 are arranged. Pipe 22 passing through
A and 22B and a nut 23 screwed to the pipes 22A and 22B fix the permeable membrane module 21 and the back plate 29.

In the permeable membrane module 21, as shown in FIGS. 2 to 5, a porous spacer 24S such as expanded polypropylene is interposed between a pair of permeable membrane films 24, and the periphery of the film 24 is heat-melted. It is attached and the plate 25 is attached to the lower side thereof.

In the lower side portion of the permeable membrane module 21, as shown in FIGS. 2 and 3, the heat-sealing portion is located slightly above the lower end of the film 24, and the two stacked sheets are stacked together. The lower side portions of the films 24, 24 are free pieces 24a. As shown in FIGS. 2 and 3, a synthetic resin plate 25 such as vinyl chloride is sandwiched between the free pieces 24a, 24a, and the plate 25
Are bonded to the free pieces 24a, 24a with an adhesive.

Openings 27 are provided at two corners of the upper side of the permeable membrane module 21 and two corners of the plate 25, respectively.
An opening 27 is also formed in the back plate 29 at the same position. The plate 25 is further provided with a plurality of notches 28 on the lower side. A similar notch 28 is also provided on the lower side of the back plate 29.

Next, as shown in FIG. 2, the permeable membrane module 2
The collar 30 is attached to the edges of the upper opening 27 on both sides of No. 1.

Then, as shown in FIG. 2, the permeable membrane module 2 is laminated with the packing 31 and the spacer 32 interposed therebetween.
1 and the openings 27 of the back plate 29 have the pipes 22A and 22B.
Is inserted.

The upper pipe 22A is a perforated pipe having a large number of holes 22a formed therein, and a rubber packing 31 is fitted on the outer pipe as shown in FIG. Each rubber packing 31 is interposed between the permeable membrane modules 21 and between the permeable membrane modules 21 and the back plate 29. The lower pipe 22B is made of a normal pipe, and the spacer 32 interposed between the plates 25 is fitted onto the pipe 22B. Pipes 22A, 2
After passing 2B through the openings 27 of the permeable membrane module 21 and the back plate 29, the nuts 23 are tightened in the pipes 22A and 22B to fix the permeable membrane module 21 and the back plate 29.

Thereafter, the side plate 33 is hooked on the pipes 22A and 22B. The side plate 33 is used for each permeable membrane module 21.
It is composed of vertically long and narrow plate members having a width sandwiched between them and between the permeable membrane module 21 and the back plate 29, and hook portions 34 are provided at two positions above and below the plate members. As shown in FIGS. 2 and 6, the side plate 33 is attached to each permeable membrane module 21.
The hook portion 34 is inserted between the pipes 22A and 22B and between the permeable membrane module 21 and the back plate 29.
The side plates 33 are assembled by mounting the side plates 33.

As shown in FIG. 2, the membrane module 20 having the side plate 33 mounted thereon is lowered toward the air diffusing tube 35, and the air diffusing tube 35 is engaged with the notch 28. This allows the air diffuser 3
A membrane module with an air diffusing tube in which 5 is located above the lower side of the permeable membrane module 21 is configured.

The membrane unit with an air diffusing tube constructed in this manner is immersed in the septic tank so that the plate surface of the permeable membrane module 21 is in the vertical direction, and the air outlet 36 of the air diffusing tube 35 is placed.
From (FIG. 6), air bubbles are supplied between the permeable membrane modules 21 and between the permeable membrane module 21 and the back plate 29. The air outlet 36 of the air diffuser 35 is located higher than the lower side of the permeable membrane module 21 (the lower side of the plate 25), and the air bubbles from the air outlets 36 directly pass through the space between the permeable membrane modules 21 and permeate. It is supplied to the space between the membrane module 21 and the back plate 29. Therefore, even if foreign matter adheres to the lower end of the permeable membrane module 21, bubbles are uniformly supplied to each space.

Since the side of each space is closed by the side plate 33, all bubbles pass above the permeable membrane module 21 without escaping to the side.

The inside of this permeable membrane module 21 is a pipe 22.
By being sucked through A, the permeated water of the membrane film 24 is sucked out of the permeable membrane module 21.

In this membrane unit 20, the side plate 33 can be easily attached and detached, and inspection and cleaning between the permeable membrane modules 21 can be easily performed. Further, since the weight of the entire membrane unit 20 is reduced, the membrane unit 20 can be easily put in and taken out from the septic tank. Further, the side plate 33 can be transported in a detached state, and the weight during transportation can be remarkably reduced.

In the present invention, it is preferable that the distance between the air outlets 36 provided in the air diffuser 35 is matched with the arrangement distance between the permeable membrane modules 21 so that the air outlets always face each space.

[0024]

As described above, the membrane unit having the air diffusing tube of the present invention can uniformly supply bubbles to all the spaces between the permeable membrane modules, and can perform efficient water treatment.

In the membrane unit of the second aspect, it is extremely easy to engage and disengage the air diffuser.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a membrane unit according to an embodiment.

FIG. 2 is an assembly explanatory diagram of the membrane unit of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a sectional view of a connecting portion between a pipe and a permeable membrane module.

FIG. 6 is a longitudinal sectional view of an essential part of the membrane unit according to the embodiment.

FIG. 7 is a cross-sectional view of a septic tank including a conventional membrane unit.

[Explanation of symbols]

 20 membrane unit 21 permeable membrane module 22A, 22B pipe 24 permeable membrane film 25 plate 28 notch 29 back plate 33 side plate 34 hook part 35 air diffuser 36 air outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuro Yamamoto 5-1, Koi Ehonmachi, Tokoname City, Aichi Prefecture Inax Co., Ltd.

Claims (2)

[Claims] 1. A membrane unit in which a plurality of flat plate-shaped permeable membrane modules are arranged in parallel, and the permeable membrane modules are installed such that the plate surfaces of the permeable membrane modules are in the vertical direction, and the permeable membrane modules of the membrane units. In a membrane unit having a diffuser tube having an air diffuser for supplying bubbles between them, the air outlet of the diffuser tube is located between the permeable membrane modules and above the lower end of the permeable membrane module. A membrane unit having an air diffuser, which is characterized in that 2. The cutout portion according to claim 1, wherein a cutout is provided at a lower side of each permeable membrane module, and the air diffuser extends through the cutout in a direction substantially perpendicular to a plate surface of the permeable membrane module. Membrane unit having an air diffusing tube.