JPH09276670A - Immersion membrane unit and immersion type membrane separator equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hollow yarn membrane module type immersion membrane unit high in treatment capacity and easy to load and unload and to prevent environment deterioration at a time of the loading and unloading thereof. SOLUTION: In an immersion membrane unit, a plurality of hollow yarn membrane modules 3 are mounted on a water gathering pipeline. The water gathering pipeline is formed into a rectangular loop pipeline in a plan view from first and second pipelines 1a, 1b and a pair of third pipelines 1c but one ends of hollow yarn bundles 3a are supported on the first pipeline 1a and the other ends thereof are supported on the first pipeline 1b and the upper ends thereof are supported by the support bars 24 stretched across a pair of rising pipelines 2 connected to the third pipelines 1c. The immersion membrane unit is mounted on a framework member 14 to be made accessible to an aeration tank and a washing tank tougher with the framework member and a loading and unloading apparatus therefor is arranged in a loading and unloading chamber capable of cutting off the open air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged membrane unit used for solid-liquid separation in wastewater treatment and the like and a submerged membrane separation apparatus equipped with the submerged membrane unit.

[0002]

2. Description of the Related Art Conventionally, as one of the devices used for solid-liquid separation in the treatment of wastewater, for example, Japanese Patent Laid-Open No. 4-197 has been proposed.
As disclosed in Japanese Patent No. 487, etc., a plurality of hollow fiber membrane modules are installed in an aeration tank to which the water to be treated is supplied, and the hollow fiber membrane modules immersed in the water to be treated are disposed from outside to inside. A so-called solid-liquid separation treatment is carried out in this manner while allowing water to permeate and taking it out of the tank.
Immersion membrane separators have been known.

[0003]

However, in this type of membrane separation device, as the hollow fiber membrane module is installed in the aeration tank, more hollow fiber membrane modules are installed as the device becomes larger. Since it is difficult to prevent the membrane from being clogged during processing, it is inevitable that the hollow fiber membrane module is taken out of the tank and washed as necessary. The larger the number, the more troublesome the installation and removal work is.

As a typical example of the hollow fiber membrane module, there is a hollow fiber membrane module generally called a loop type in which a hollow fiber bundle is supported in a U-shaped bent shape. The installation and removal of the fiber membrane module is performed, for example, as disclosed in Japanese Patent Laid-Open No. 4-197487, at the lower end of the rising pipe connected to the permeate water supply pipe arranged outside the aeration tank. The water collecting pipe is connected to the water collecting pipe, and a predetermined number of hollow fiber membrane modules are attached to the water collecting pipe, and the so-called immersion membrane unit having such an appearance is used.

Therefore, it is preferable to mount a larger number of hollow fiber membrane modules per one dipping membrane unit, and in order to increase the strength thereof, as shown in FIG. A water collecting conduit 1 formed in a rectangular loop conduit is provided, and first and second conduits 1a and 1b in the longitudinal direction of the conduit 1, that is, a pair of first and second conduits to which the lower ends of the rising conduits 2 are connected. First and second connected through three conduits 1c
The hollow fiber membrane modules 3 were mounted in the pipe lines 1a and 1b at predetermined intervals.

However, even with such a mounting, it is difficult to mount a large number of large hollow fiber membrane modules 3 due to the strength of the water collecting conduit 1 and the like. A submerged membrane unit equipped with more hollow fiber membrane modules, which is suitable for a membrane separation device, has not been obtained.

The loop-type hollow fiber membrane module 3 is mounted by supporting both ends of the hollow fiber bundle on the first and second conduits 1a and 1b, respectively, and generally, the hollow fiber bundle is placed on the upper side. It is used by being placed in an aeration tank so that it faces, but due to aeration (or aeration) shock, the root part of the supported hollow fiber bundle is easily fatigued and damaged or damaged. Since the length is limited, it is difficult to make the membrane area per one hollow fiber membrane module sufficiently large, and thus the increase of the processing capacity is hindered. In addition, when taking out the submerged membrane unit from the aeration tank and cleaning it, there is a drawback in environmental hygiene that odor diffuses.

In view of these drawbacks, the present invention has made earnest studies to solve them, and as a result, the immersion membrane unit is attached to the frame body, and the frame body unit is put in and taken out from the aeration tank or the like. In addition, it is found that the hollow fiber membrane module can be installed in the submerged membrane unit by supporting one end of the hollow fiber bundle in one of the conduits forming the water collecting conduit and the hollow fiber in the other conduit. It was found that the other end of the bundle should be supported and mounted, and that it should be supported by a support bar that is hung between one rising pipe and the other rising pipe.

[0009]

That is, one of the submerged membrane units according to the present invention is, as described in claim 1,
The water collecting pipe line is connected to the lower end of the rising pipe line that is directly connected to the permeated water supply pipe line that is arranged outside the aeration tank to which the water to be treated is supplied or through the connecting pipe line. In a submerged membrane unit in which a plurality of hollow fiber membrane modules are mounted in a water pipeline, the water collecting pipeline is provided with a first pipeline in which one end of a hollow fiber bundle of the hollow fiber membrane module is supported and the other end of the hollow fiber bundle. The rising pipe is composed of a supported second pipeline and at least one third pipeline having one end coupled to the first pipeline and the other end coupled to the second pipeline. The lower end of the passage is connected to at least one of the first to third pipelines.

Another aspect of the submerged membrane unit according to the present invention is, as described in claim 2, in the submerged membrane unit according to claim 1, in which the water collecting pipes are the first and second pipes. And a pair of third pipelines forming a loop pipeline having a rectangular shape in a plan view, and a lower end of the rising pipeline is connected to each of the pair of third pipelines.

Another aspect of the submerged membrane unit according to the present invention is, as described in claim 3, in the submerged membrane unit according to claim 2, a hollow supported by the first and second conduits. It is characterized in that the yarn bundle is formed in an inverted U-shape by being supported by a support bar which is hung on one rising pipe line and the other rising pipe line.

Another aspect of the submerged membrane unit according to the present invention is, as described in claim 4, in the submerged membrane unit according to claim 2 or 3, wherein both ends of the hollow fiber bundle are first and second. It is characterized in that it is detachably supported on the two conduits.

Another aspect of the submerged membrane unit according to the present invention is the submerged membrane unit according to claim 2, 3 or 4, wherein both ends of the hollow fiber bundle are rectangular. It is characterized by being supported by the figure.

According to one aspect of the immersion type membrane separation apparatus of the present invention, as described in claim 6, a chemical solution cleaning tank is provided adjacent to the aeration tank to which the water to be treated is supplied. , 3, 4 or 5 is equipped with a cargo handling device for loading and unloading the framework having the immersion membrane unit mounted in and out of the aeration tank and the chemical cleaning tank.

Further, as another aspect of the immersion type membrane separation device according to the present invention, as in claim 7, in the immersion type membrane separation device according to claim 6, the cargo handling device is shut off from the outside air. It is characterized in that it is mounted in a cargo handling room that can be used.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an aeration tank 4 is an air diffuser pipe which is connected to the other end of an air supply conduit 5 which is connected to a blower (not shown) outside the tank and is guided to the bottom of the tank. 6 and a raw water supply pipe 7 for supplying the water to be treated into the tank.

A chemical cleaning tank 8 is disposed adjacent to the aeration tank 4 and a frame structure 9 is fixed at a predetermined position such as the bottom of the tank. The wall board 10 is attached to the upper part of the frame structure 9 to form the cargo handling room 11, that is, the wall plate 10 is attached to the front, rear, left and right end surfaces and the upper end surface of the upper part of the frame structure 9 to block outside air. A cargo room 11 is formed in the structure.

In addition, a cargo handling device (hoist) 12 is mounted in the cargo handling chamber 11. The cargo handling device 12 is mounted so as to be guided by a rail 13 and movable in the left and right directions.

Therefore, the framework 14 can be suspended and moved in the left-right direction, and the suspended framework 14 is lowered from the upper position indicated by the chain double-dashed line at the left cargo handling position. It can be mounted on the frame receiver 15 attached to the lower part of the frame structure 9.

On the contrary, the framework 14 mounted on the framework receiver 15 can be lifted and raised to be moved to the original upper position (the position indicated by the chain double-dashed line). Further, also in the right cargo handling position, the suspended frame 14 can be moved down into the chemical cleaning tank 8 from the position above the chemical cleaning tank 8 and the framework 14 inside the chemical cleaning tank 8 can be moved. Can be lifted and moved to the original position above.

A rectifying plate 16 is attached to the lower portion of the frame structure 9, and a nozzle 18 is attached to the other end of an air supply conduit 17 whose one end is connected to a blower (not shown) outside the tank. A hanging metal fitting 19 is attached to the upper end of the frame assembly 14. Therefore, the cargo handling device 12 is
The frame 14 can be suspended by hooking the hooks on the frame 9.

Next, an enlarged view of the framework 14 is shown in FIG. 2 which is a front view and FIG. 3 which is a plan view of this drawing. In the framework 14, a pair of immersion membrane units 20 are shown. Is installed.

The number of submerged membrane units 20 installed is
Although a predetermined number is selected according to need, the immersion membrane unit 20 is formed into a loop pipeline having a rectangular plan view, that is, the first and second pipelines 1a and 1b and a pair of third pipelines. Water collection line 1 formed into a rectangular loop line with 1c
And a rising conduit 2 whose lower end is connected to each of the pair of third conduits 1c, and one end of the hollow fiber bundle 3a supported by the first conduit 1a and the other end supported by the second conduit 1b. It is composed of a plurality of hollow fiber membrane modules 3 attached by

Further, the pair of rising pipes 2 are fixed fittings 2
The first and second conduits 1a and 1b in the longitudinal direction of the water collecting conduit 1 which are fixed to the framework 14 via the 2 are arranged at regular intervals in the framework 14 as shown in FIGS. It is arranged between a pair of stoppers 23 mounted on the. Therefore, by both stoppers 23, the water collecting pipe line 1
However, it is possible to prevent excessive movement in the direction (left-right direction) orthogonal to the longitudinal direction.

Further, the hollow fiber bundle 3 of the hollow fiber membrane module 3
a is supported by a support bar 24 that is laid over one rising pipe 2 and the other rising pipe 2, and is formed in an inverted U-shape.

Therefore, even if the hollow fiber bundle 3a is much longer, its shape can be kept constant, and one end of the hollow fiber bundle 3a is supported by one of the first conduits 1a and is hollow. Since the other end of the yarn bundle 3a is supported by the other second pipe line 1b which is separated from the first pipe line 1a by a constant distance, the contact area with the water to be treated can be significantly increased. It can be processed well and therefore the throughput can be increased.

The first and second conduits 1a and 1b in the longitudinal direction of the water collecting conduit 1 are provided with a plurality of water collecting headers 21 mounted at regular intervals. As shown in FIGS. 5 to 7, the flange 25 holding the end of the hollow fiber bundle 3 a is fitted and the lid 26 is bolted to the water collecting header 21. It is fixed.

Therefore, if necessary, the hollow fiber membrane module 3 can be quickly attached and detached, and as shown in the drawing, both ends of the hollow fiber bundle 3a are supported in a rectangular shape. It is possible to prevent damage or breakage of the root portion due to aeration shock (or aeration shock) inside.

In the following treatment, the liquid to be treated is supplied from the raw water supply pipe 7 into the aeration tank 4 and is diffused from the diffuser pipe 6, and pressurized air is jetted from the nozzle 18. Therefore, the framework 1 mounted on the framework receiver 15
The liquid to be treated is forcibly circulated downward from the upper part of 4.

Then, during such circulation, the external pressure type hollow fiber membrane module 3 filters water, that is, moisture permeates from the outside to the inside of the large number of hollow fibers constituting the hollow fiber bundle 3a, and then the permeation thereof. Water is sent to the water collection line 1. More specifically, the hollow fiber bundle 3a is sent to the water collecting header 21 which is supported at both ends thereof, and is further sent to the third conduit 1c via the first and second conduits 1a and 1b.

Therefore, although it can be sent to the outside of the tank through the rising pipe 2 connected to the third pipe 1c, it is arranged outside the rising pipe 2 and the aeration tank 4 as shown in the drawing. Since the permeated water transmission line which is not connected is connected via the connection line 27 (see FIG. 2), the permeated water from the first pipe line 1a and the permeated water from the second pipe line 1b are connected here. Combined and sent to the permeate water supply pipe. At that time, a pump (not shown) mounted on the permeated water supply pipe line is controlled in a predetermined manner.

Therefore, during the treatment, the water to be treated is forcibly circulated, and the hollow fiber bundle 3a of the hollow fiber membrane module 3 is supported by the support bar 24.
Since the shape is prevented from being excessively deformed, the degree of clogging of the membrane can be further slowed down, and good treatment can be performed for a long time.

When the membrane is gradually clogged while the treatment is continued and it becomes necessary to clean the membrane, the frame body 14 mounted on the frame frame receiver 15 is moved to the cargo handling device 12 Suspend and lift with the original position above (Fig. 1
To the position indicated by the chain double-dashed line). At that time, the frame assembly 14 is guided by a vertical guide (not shown) mounted on the frame structure 9 and raised.

Prior to suspending and raising the framework 14 by the cargo handling device 12, a worker in the cargo handling room 11
The permeate water supply pipeline is separated from the connection pipeline 27, and the permeate water supply pipeline is evacuated to a place where it does not interfere with the movement of the framework 14. Since the permeate water supply conduit is composed of a flexible pressure resistant hose, it can be easily retracted.

Subsequently, the frame body 14 which has been moved upward as shown by the chain line in FIG.
Is moved to the upper side, and then is moved to the lower side and immersed in the cleaning liquid in the chemical liquid cleaning tank 8. If it can be washed in a predetermined manner, it is moved to the original upper position and then moved to the left side,
Next, it is placed on the lower frame receiver 15 from the upper position shown by the chain line, and the operator connects the connecting pipe 2
The permeated water supply pipeline is connected to 7.

In this way, more hollow fiber membrane modules 3 can be washed with the chemical liquid at one time and reused, and since such washing is performed in the cargo handling room 11, odors Can be prevented from diffusing.

Although one embodiment has been described above, in the present invention, the permeate water supply pipeline may be directly connected to the rising pipeline 2 without using the connecting pipeline 27. In some cases, make sure that the upper end of the rising pipe 2 is at the water level 2.
8 is preferably provided so as to project above.

The air diffuser pipe 6 and the nozzle 18 may be omitted and the diffuser pipe 6 may be guided below the frame receiver 15. Further, the water collecting pipe line is a loop pipe line whose plan view is rectangular. Other than that, for example, a first conduit in which one end of the hollow fiber bundle of the hollow fiber membrane module is supported and a second conduit in which the other end of the hollow fiber bundle is supported are one It may be formed in various shapes as necessary, such as connecting with three conduits and forming a conduit having a U-shape or an H-shape in plan view.

Also, the lower end of the rising pipeline to the water collection pipeline may be connected only to the third pipeline, or to the first and the first pipelines.
It is connected to one or both of the two pipelines, or the first to third
It may be connected to various modes such as connecting to a pipeline or the like, if necessary. Further, the hollow fiber membrane module may be attached to the water collecting pipe in a U-shape or the like, and the water collecting pipe is preferably installed horizontally, but may be tilted at a predetermined angle if necessary. May be installed.

In FIGS. 5 to 7 showing the supporting mode of the hollow fiber bundle 3a, the hollow fibers constituting the hollow fiber bundle 3a are separated from each other. Supported.

[0041]

As described above, according to the first and second aspects of the present invention, with respect to the submerged membrane unit equipped with the hollow fiber membrane module, a submerged membrane unit suitable for a large-sized submerged membrane separation apparatus can be obtained.

According to the third aspect of the present invention, even with a much longer hollow fiber bundle, the shape of the hollow fiber bundle can be kept constant and the contact area with the water to be treated can be significantly increased. A membrane unit is obtained.

Further, according to the invention described in claim 4, it is possible to obtain the submerged membrane unit in which the work of mounting or removing the hollow fiber membrane module can be easily performed.

Further, according to the invention described in claim 5, it is possible to prevent damage or breakage of the root portion of the hollow fiber bundle due to aeration shock (or aeration shock) during processing.

Further, according to the invention described in claim 6, even if there are a plurality of immersion membrane units and they are large in size, the immersion type membrane separation device can easily carry out the cargo handling work for cleaning them. Is obtained.

Further, according to the invention described in claim 7, there is provided an immersion type membrane separation device capable of preventing odor from diffusing and deteriorating the environment during the cargo handling of the immersion membrane unit.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of an immersion type membrane separation device.

FIG. 2 is a front view of a submerged membrane unit 20.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a front view showing a support mode of the first and second conduits 1a and 1b.

FIG. 5 is a plan view showing a support mode of an end portion of a hollow fiber bundle 3a.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a left side view of FIG.

FIG. 8 is a perspective view of a conventional submerged membrane unit.

[Explanation of symbols]

 1 Water collection pipe 1a 1st pipe which comprises the water collection pipe 1 1b 2nd pipe which comprises the water collection pipe 1 1c 3rd pipe which comprises the water collection pipe 1 2 Rise pipe 3 Hollow Fiber Membrane Module 3a Hollow Fiber Bundle 4 Aeration Tank 5 Air Supply Pipeline 6 Diffuser Pipe 7 Raw Water Supply Pipeline 8 Chemical Solution Cleaning Tank 11 Cargo Handling Room 12 Cargo Handling Equipment 14 Framework 15 Frameworks 20 Immersion Membrane Unit 21 Water Collection Header 24 Support Bar 27 Connection pipe 28 Water surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Murata 1-45 Oe 1-45 Otsu Shiga Prefecture Toray Engineering Co., Ltd. (72) Inventor Masatoshi Yao 1-45 Oe Otsu, Shiga Prefecture No. Toray Engineering Co., Ltd.

Claims (7)

[Claims] 1. A water collecting conduit is provided at the lower end of a rising conduit which is connected directly or through a connecting conduit to a permeated water feeding conduit arranged outside an aeration tank to which water to be treated is supplied. A submerged membrane unit in which a plurality of hollow fiber membrane modules are connected to each other and attached to the water collection conduit, wherein the water collection conduit is a first conduit having one end of a hollow fiber bundle of the hollow fiber membrane module supported and the hollow fiber. A second pipeline in which the other end of the bundle is supported, and at least one third pipeline in which one end is coupled to the first pipeline and the other end is coupled to the second pipeline,
And, the lower end of the rising pipe is at least the first to
An immersion membrane unit, which is connected to any one of three conduits. 2. The immersion membrane unit according to claim 1, wherein the water collecting conduit is formed into a loop conduit having a rectangular plan view by the first and second conduits and the pair of third conduits. An immersion membrane unit characterized in that the lower end of the rising pipe is connected to each of the third pipes. 3. The immersion membrane unit according to claim 2, wherein the hollow fiber bundles supported by the first and second conduits are supported by one support pipe and the other support pipe. An immersion membrane unit, which is supported and formed in an inverted U shape. 4. The immersion membrane unit according to claim 2 or 3, wherein both ends of the hollow fiber bundle are detachably supported by the first and second conduits. 5. The immersion membrane unit according to claim 2, 3 or 4, wherein both ends of the hollow fiber bundle are supported in a rectangular shape. 6. A chemical solution cleaning tank is provided adjacent to the aeration tank to which the water to be treated is supplied, and the framework equipped with the immersion membrane unit according to claim 2, 3, 4 or 5 is used as an aeration tank and a chemical solution. An immersion type membrane separation device, which is equipped with a cargo handling device for loading and unloading into and from a cleaning tank. 7. The immersion type membrane separation device according to claim 6, wherein the cargo handling device is mounted in a cargo handling chamber capable of blocking outside air.