JPH11188360A - Purification tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the inspection and maintenance of membrane modules and a diffusion pipe by a process in which in a purification tank equipped with parallel membrane modules to filter sewage, membrane holding parts for holding the both end parts of the module are installed freely attachably/ detachably on the inside wall of a purification main body. SOLUTION: A purification tank, the inside of which is divided into two precipitation/separation tanks 8 and one aeration tank 7 in which membrane modules 1 are installed in parallel by partition panels, filters sewage. Membrane holding parts 2 for holding both end parts of the module 1 freely attachably/ detachably are installed on the inside wall of a purification tank main body. The holding parts 2 formed from longitudinal groove parts 3 formed on the opposite surface to the inside wall of an aeration tank 7 main body hold the modules 1 vertically at regular intervals by being engaged with both end parts of the modules 1. Only water in sewage is allowed to pass through the pores of the module 1 to produce pure water, which is discharged outside through drain channel and discharge opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank such as a small-sized combined septic tank for home use, and more particularly to a septic tank for separating suspended sludge substances and water by a membrane module disposed in a diffused aeration tank.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a septic tank such as a small-sized combined septic tank using a membrane separation activated sludge method has been proposed.

That is, in this septic tank, a plurality of membrane modules 1 are vertically arranged at regular intervals in an aeration tank 7 in the septic tank, and a diffuser tube 5 is arranged below the membrane module 1. The drain pipe 19 is provided with a drain pump 14. And the sewage 2 in the aeration tank 7
1 is aerated by an aeration gas 22 blown out from the air diffuser 5 between the membrane modules 1 and subjected to a purification treatment. Also,
By operating the drain pump 14, the sewage 21 is finely filtered by the filtration membrane of the membrane module 1 to become purified water 18, and the purified water 18 is discharged from the drain port of the membrane module 1 to the drain pipe 19.
Is discharged. On the other hand, the sludge 24 adhered to the membrane surface of the filtration membrane by filtration is desorbed from the membrane surface by an ascending flow generated by the air lift action of the bubbles of the aeration gas 22 rising between the membrane modules 1.

Further, a plurality of membrane modules 1 are held in an upright state on a frame member having a leg to form a membrane unit 15, and this membrane unit 15 is immersed in sewage 21 in an aeration tank 7 to perform aeration. The leg is abutted on the bottom of the tank 7 and placed, and the membrane module 1 is held in a state of floating above the bottom of the aeration tank 7.

The air diffuser 5 has a substantially L-shape, and includes a horizontal pipe 5a having a plurality of air diffusers, and a vertical pipe 5b integrally provided at one end of the horizontal pipe 5a. Is formed. The horizontal tube portion 5a is the membrane unit 1 below the membrane module 1.
The vertical tube 5b is arranged along the inner wall of the aeration tank 7 and is connected to a pump outside the aeration tank 7 between the five legs.

In such a septic tank, the sludge 24 in the sewage 21 and the purified water 18 can be precisely separated at high speed using the membrane module 1, and the aeration gas 22 from the air diffuser 5 is used.
Thereby, the attached sludge 24 on the membrane surface of the membrane module 1 is appropriately removed.

[0007]

However, in the above-mentioned conventional septic tank, it is necessary to periodically raise the membrane module 1 onto the tank for inspection and maintenance of the membrane module 1. At the time of the lifting, it is necessary to lift the entire membrane unit 15 in a state that the sludge 24 and the purified water 18 are included, and the lifting of a heavy object is not easy. In addition, when raising the air diffuser 5 for inspection and maintenance of the air diffuser 5, it is necessary to raise the membrane unit 15 above the air diffuser 5 each time, and there is a problem that it is troublesome.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a septic tank in which inspection and maintenance of a membrane module and an air diffuser can be easily performed.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a septic tank in which a plurality of membrane modules 1 are arranged in parallel and a wastewater 21 is filtered.
On the inner wall surface of the septic tank main body 9, a membrane holding section 2 for detachably holding both ends of the membrane module 1 is provided.

In such a septic tank, a plurality of membrane modules 1 are arranged and held on a membrane holding section 2 provided on the inner wall surface of the septic tank main body 9, and the membrane module 1 performs a filtration process on sewage 21 in the septic tank. At the time of inspection and maintenance of the membrane module 1, the membrane module 1 is detached from the membrane holding unit 2, and the membrane module 1 is lifted on a tank.

Further, the invention according to claim 2 is characterized in that, in the invention according to claim 1, the membrane holding portion 2 is constituted by a plurality of vertical grooves 3 provided on the opposed surface of the inner wall of the septic tank main body 9. I have.

In such a septic tank, the ends of the membrane modules 1 are fitted into and held in a plurality of vertical grooves 3 provided on the facing surface of the inner wall of the septic tank main body 9 from above, and the membrane module 1 is pulled up from the vertical grooves 3. Occasionally, the film module 1 is pulled up along the vertical groove 3 to perform the operation.

According to a third aspect of the present invention, in the first or second aspect, the panel body is detachably held on the inner wall surface of the septic tank main body 9 in proximity to the outer surface of the outermost membrane module 1. And a diffuser tube 5 for feeding the gas 22 between the membrane modules 1, and the diffuser tube 5 is detachably held by a diffuser tube holder 6 provided on the panel body 4. ing.

In such a septic tank, the sludge 24 in the sewage 21 is aerated by the gas 22 blown out from the diffuser pipe 5 and sent between the membrane modules 1, and is brought close to the outer surface of the outermost membrane module 1. The gas 2 surrounds the panel body 4 by the panel body 4 detachably held on the inner wall of the main body 9.
2 is raised to increase the rising speed of the gas 22 with the outermost membrane module 1. Also,
The diffuser tube 5 is fixed and detached by the diffuser tube holder 6 provided on the panel body 4.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the diffuser tube holding portion 6 slidably holds the distal end opening of the diffuser tube 5 in the width direction of the membrane module 1. The feature is constituted.

In such a septic tank, the opening portion of the diffuser tube 5 is slid by the diffuser tube holding portion 6 in the width direction of the membrane module 1 so that the gas 22 can be uniformly fed between the membrane modules 1. The position of the opening of the tip is adjusted to hold the air diffuser 5.

According to a fifth aspect of the present invention, in the third aspect of the invention, the diffuser tube holding portion 6 holds the distal end opening of the diffuser tube 5 and one end opening communicates with the distal end opening of the diffuser tube 5. Then, an extension pipe 29 whose other end opening is located below the membrane module 1 is provided.

In such a septic tank, the gas 22 blown out from the diffuser tube 5 flows into the extension tube 29 via the diffuser tube holder 6, and the front end opening is previously set at an appropriate position below the membrane module 1. The gas is blown out from the opening at the distal end of the extension tube 29 whose length is adjusted so as to be disposed in the space, and the gas 22 is appropriately sent between the membrane modules 1.

According to a sixth aspect of the present invention, in the third aspect of the present invention, a gas passage 16 having openings at the upper and lower ends of the panel body 4 is provided inside the panel body 4, and the gas passage 16 at the upper gas passage 16 opening is provided. The air diffusion tube holding portion 6 is provided.

In such a septic tank, the gas 22 blown out from the diffuser tube 5 flows into the gas passage 16 inside the panel body 4 via the diffuser tube holder 6, and the gas passage 16 at the lower end of the panel body 4 is opened. The gas 22 is blown further below the membrane module 1.

[0021]

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

FIG. 1 is a cross-sectional view showing a septic tank according to an embodiment of the present invention. FIG. 2 is a schematic vertical sectional view showing the entire configuration of the septic tank according to the first embodiment. 3 shows a main part of the septic tank according to the first embodiment. FIG. 3 (a) is a perspective view and FIG. 3 (b) is a transverse sectional view. FIG. 4 is a longitudinal sectional view showing a main part of the septic tank according to the first embodiment.

As shown in FIGS. 1 to 4, this septic tank has a plurality of membrane modules 1 arranged in parallel to filter waste water 21. Further, a membrane holding section 2 for detachably holding both ends of the membrane module 1 is provided on the inner wall surface of the septic tank main body 9.

In the purification tank, the outer tank is divided into three tanks by a partition plate, and two adjacent tanks among the three tanks are used as the sedimentation separation tank 8, and the remaining one tank is used as the aeration tank 7. Sedimentation separation tank 8
Is to roughly separate the sludge 24 and the supernatant liquid 25 by causing the sludge 24 contained in the sewage 21 flowing from the inflow port 27 to settle on the bottom surface of the sedimentation / separation tank 8. Is used continuously, and the precipitation separation treatment is performed in two stages. Then, the supernatant liquid 25 containing the sludge 24 roughly separated in the sedimentation separation tank 8 is sent into the aeration tank 7, and the supernatant liquid 25 is separated into sludge 24 and water precisely as the wastewater 21 in the aeration tank 7. The transfer of the supernatant liquid 25 between each tank is performed by the transfer pump 12 installed in each tank and the transfer pipe 13 connected to the transfer pump 12. An opening is provided above each tank, and a removable septic tank lid 26 is provided at the opening.

The membrane holding section 2 is formed of a plurality of vertical grooves 3 provided on the opposite surface of the inner wall of the aeration tank 7, and is detachably fitted to and held at both ends of the plurality of membrane modules 1.
The membrane modules 1 are vertically arranged at regular intervals and held.

The membrane module 1 is formed by attaching a filtration membrane having innumerable micropores on both sides of a substantially rectangular frame material. The space between the filtration membrane and the frame member is communicated with the external space by a drain passage, and a drain port communicating with the drain pipe 19 is provided at an opening of the drain passage on the outside space side. Then, only water in the sewage 21 outside the membrane module 1 is passed through the micropores to be purified water 18 by the drain pump 14 provided in the drain pipe 19, and the purified water 18 passes through the drain passage and the discharge port. The water is guided to the drain pipe 19 and sent out from the outlet 28 to the outside.

The panel body 4 detachably held on the inner wall surface of the septic tank main body 9 in the vicinity of the outer surface of the outermost membrane module 1
And a diffuser tube 5 for sending the gas 22 between the membrane modules 1 is detachably held by a diffuser tube holder 6 provided on the panel body 4. A diffuser pump 17 is provided in the diffuser tube 5.
, And the waste water 2 in the aeration tank 7 is
The gas 22 is blown out in 1. The panel body 4 is formed as a rigid body that cannot pass water having substantially the same shape as the membrane module 1 into the inside. The end of the panel body 4 is externally fitted and held in the vertical groove 3 outside the outermost membrane module 1 in the membrane holding section 2. Air diffuser holding part 6
Are formed from a tube holding piece 30 protruding at an appropriate position on the outer surface of the panel body 4 and a tube holding hole 32 formed on the side surface of the lower end of the panel body 4. The tube holding piece 30 is formed from both side pieces 31 provided at intervals so as to hold the middle part of the diffuser tube 5, and holds the middle part of the diffuser pipe 5 between both side pieces 31 in a state of being erected. . Further, the cylinder holding hole 32 is formed in a circular shape having substantially the same size as the outer shape of the air diffuser 5, and the distal end opening of the air diffuser 5 is slidably fitted and held in the width direction of the membrane module 1. I have. The membrane module 1 is held in a state of being floated from the bottom of the aeration tank 7, and the opening at the tip of the air diffuser 5 is located immediately below the group of membrane modules 1.

In such a septic tank, the ends of the membrane module 1 are fitted into and held in a plurality of vertical grooves 3 provided on the opposing surface of the inner wall of the septic tank. In addition, panel body 4
The air diffuser tube 5 is fixed to the panel body 4 by the air diffuser tube holding portion 6 provided on the panel body 4. In this fixing, first, the tip opening of the diffuser 5 is slid in the width direction of the membrane module 1 to dispose the tip opening of the diffuser 5 at a position where the gas 22 can be appropriately sent between the membrane modules 1. The trachea 5 is held. Tube holding hole 3
2 is formed in substantially the same shape as the diffuser tube 5, so that the inner surface of the cylinder holding hole 32 fits and holds the outer periphery of the diffuser tube 5 at an arbitrary position. Then, the middle part of the air diffusion tube 5 is fitted between the both side pieces 31 of the cylinder holding piece 30 so as to be pushed from the side.
The two side pieces 31 are widened outward by the diffuser 5,
Sandwich. Then, the panel body 4 provided with the air diffuser 5 is fitted into the longitudinal groove portion 3 from above at the end, and is held close to the outer surface of the outermost membrane module 1.

The sewage 21 in the aeration tank 7 is aerated by the aeration gas 22 blown out from the air diffuser 5 between the membrane modules 1 and purified. Further, by operating the drainage pump 14 connected to the drainage pipe 19, the purified sewage 21 is finely filtered by the filtration membrane of the membrane module 1 and discharged from the drainage port of the membrane module 1 to the drainage pipe 19. . On the other hand, the sludge 24 adhered to the membrane surface of the filtration membrane by filtration is desorbed from the membrane surface by an ascending flow generated by the air lift action of the bubbles of the aeration gas 22 rising between the membrane modules 1. In addition, the panel body 4 causes the gas 22 to flow upward around the panel body 4, thereby increasing the rising speed of the gas 22 between the panel module 4 and the outermost membrane module 1.

Inspection and maintenance of the membrane module 1 are performed by pulling up each of the membrane modules 1 along the longitudinal grooves 3 to separate them from the membrane holding section 2 and then pulling them up on the tank. Inspection and maintenance of the air diffuser 5 is performed by pulling up the panel body 4 along the vertical groove 3 and detaching the panel body 4 from the membrane holding unit 2, and then pulling the panel body 4 up on the tank. Pull-out, cylinder holding hole 32
The air diffusion tube 5 is detached from the air diffusion tube holding section 6 by pulling out the front end of the air diffusion tube 5 from the apparatus.

FIG. 5 is a longitudinal sectional view showing a main part of a septic tank different from that of the above embodiment of the present invention.

As shown in FIG. 5, this septic tank has substantially the same shape as the above-mentioned septic tank. The difference is that in the same septic tank, the diffuser tube holding part 6 holds the distal end opening of the diffuser tube 5, the one end opening communicates with the diffuser tube 5 distal opening, and the other end opening is located below the membrane module 1. That is, an extension pipe 29 is provided. A fixing tube 10 having a threaded portion on the outer periphery is protrudingly provided on the side of the membrane module 1 around the cylinder holding hole 32 in the panel body 4. Extension tube 2
The root of 9 is slightly widened, and a threaded portion to be screwed to the threaded portion of the fixed tube 10 is formed on the inner surface of the root.

In such a septic tank, the tip of the diffuser pipe 5 is fitted into the cylinder holding hole 32, and the extension pipe 2 is screwed into the fixed pipe 10.
9 is screwed into the screw part at the base part. The gas 22 blown out from the air diffuser 5 passes through the air diffuser holding unit 6 and extends through the extension pipe 29.
And is blown out from the distal opening of the extension tube 29 whose length has been adjusted so that the distal opening is disposed at an appropriate position below the membrane module 1 in advance. Send it in. The length of the extension pipe 29 can be selected and set so that the gas 22 blown out from the tip opening of the extension pipe 29 is uniformly sent between the membrane modules 1.

FIG. 6 is a longitudinal sectional view showing a main part of a septic tank different from that of the embodiment of the present invention.

As shown in FIG. 6, this septic tank is formed in substantially the same shape as the above-mentioned septic tank. The difference is that the cylinder holding hole closing lid 11 is screwed and fixed to the fixed tube 10 of the cylinder holding hole 32. Usually, a plurality of cylinder holding holes 32 are provided in the panel body 4 in order to adjust the amount of the gas 22 for aeration, and the number of the air diffusion tubes 5 fixed to the cylinder holding holes 32 is determined according to the number of the membrane modules 1. Is increasing or decreasing. Membrane module 1
When the number of air diffusers 5 is small, the number of the diffuser tubes 5 is small. Therefore, there is a cylinder holding hole 32 that is not used. It is necessary to close the cylinder holding hole closing lid 1
1 is used.

FIG. 7 is a longitudinal sectional view showing a main part of a septic tank different from that of the embodiment of the present invention.

As shown in FIG. 7, this septic tank is formed in substantially the same shape as the above-mentioned septic tank. The difference is that the gas passage 16 having openings at the upper and lower ends of the panel body 4 is provided inside the panel body 4, and the diffuser tube holding section 6 is provided at the opening of the upper gas passage 16. The diffuser tube holding portion 6 is formed in a tubular shape that is fitted to the opening of the distal end of the diffuser tube 5.

In such a septic tank, the gas 22 blown out from the diffuser tube 5 flows into the gas passage 16 inside the panel body 4 via the diffuser tube holding portion 6, and the gas passage 16 at the lower end of the panel body 4 is opened. The gas 22 is blown further below the membrane module 1. The diffuser tube 5 can be easily attached to and detached from the cylindrical diffuser tube holding portion 6.

[0039]

According to the first aspect of the present invention, a plurality of membrane module ends are arranged and held detachably on a membrane holding portion provided on the inner wall surface of the septic tank main body, so that a membrane for holding the membrane module is provided. No unit is required, the installation work of the membrane module is reduced, and the cost can be reduced. In addition, since the membrane module can be detached independently, inspection and maintenance of the membrane module are easy.

According to the second aspect of the present invention, the end of the membrane module is inserted into each of the plurality of vertical grooves provided on the opposing surface of the inner wall of the septic tank main body and is detachably held.
It is easy to pull up or insert the membrane module along the vertical groove.

According to the third aspect of the present invention, the panel body held by the membrane holding portion close to the outermost membrane module causes a recirculation of gas to rise around the panel body, thereby causing the outermost membrane module to return. The rate of rise of the gas between the membrane module and the membrane module can be increased, and the gas can be efficiently aerated to the membrane module. Further, the diffuser tube holding portion provided on the panel body can fix and remove the diffuser tube without disturbing the membrane module, and the inspection and maintenance of the diffuser tube are easy.

According to the fourth aspect of the present invention, the front end of the diffuser tube is slid in the width direction of the membrane module by the diffuser tube holding portion so that gas can be properly sent between the membrane modules. Since the openings can be arranged, the gas can be uniformly aerated in accordance with the position and the number of the membrane modules.

According to the fifth aspect of the present invention, by changing the length of the extension tube, the tip opening of the air diffuser can be arranged at a position where gas can be appropriately sent between the membrane modules. Aeration of the membrane module can be performed uniformly.

According to the sixth aspect of the present invention, the air diffuser can be easily attached to and detached from the cylindrical air diffuser holding portion provided at the upper end of the panel body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a septic tank according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view showing the entire configuration of the septic tank according to the first embodiment.

FIGS. 3A and 3B show a main part of the septic tank, wherein FIG. 3A is a perspective view and FIG. 3B is a transverse sectional view.

FIG. 4 is a longitudinal sectional view showing a main part of the septic tank according to the first embodiment.

FIG. 5 is a longitudinal sectional view showing a main part of a septic tank different from the above in the embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a main part of a septic tank different from that of the embodiment according to the present invention.

FIG. 7 is a longitudinal sectional view showing a main part of a septic tank different from the above according to the embodiment of the present invention.

FIG. 8 is a schematic vertical sectional view showing a conventional septic tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Membrane module 2 Membrane holding | maintenance part 3 Vertical groove part 4 Panel body 5 Air diffuser 5a Horizontal tube 5b Vertical tube 6 Air diffuser holding part 7 Aeration tank 8 Precipitation separation tank 9 Purification tank main body 10 Fixed pipe 11 Cylinder holding hole closing lid 12 Transfer Pump 13 Transfer pipe 14 Drain pump 15 Membrane unit 16 Gas passage 17 Air diffuser pump 18 Purified water 19 Drain pipe 21 Sewage water 22 Gas 24 Sludge 25 Supernatant 26 Purification tank lid 27 Inlet 28 Outlet 29 Extension tube 30 Tube holder 31 32 pieces on both sides

Claims (6)

[Claims] 1. A septic tank for filtering wastewater by arranging a plurality of membrane modules in parallel therein, wherein a membrane holding portion for detachably holding both ends of the membrane module is provided on an inner wall surface of the septic tank main body. And a septic tank. 2. The septic tank according to claim 1, wherein the membrane holding section comprises a plurality of vertical grooves provided on a surface facing the inner wall of the septic tank main body. 3. A panel body removably held on the inner wall surface of the septic tank main body in proximity to the outer surface of the outermost membrane module, and a diffuser pipe for sending gas between the membrane modules is provided. The septic tank according to claim 1, wherein the septic tank is detachably held by an air diffuser holding portion provided on the panel body. 4. The septic tank according to claim 3, wherein the air diffuser holding portion holds the opening of the front end of the air diffuser slidably in the width direction of the membrane module. 5. An air diffusion tube holding portion for holding an end opening of an air diffusion tube, and an extension tube having one end communicating with the air diffusion tube front opening and the other end being located below the membrane module. The septic tank according to claim 3, characterized in that: 6. The septic tank according to claim 3, wherein a gas passage having openings at upper and lower ends of the panel body is provided inside the panel body, and a diffuser holding portion is provided at the upper gas passage opening.