JPH09271644A - Flotation preventing structure of immersion type membrane separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the flotation of a membrane separator and to easily make the membrane separator accessible to a treatment tank from the outside by interposing a fixing means preventing the movement of the membrane separator from the bottom part of the treatment tank to the ceiling part thereof between the ceiling part and the membrane separator in a freely detachable manner. SOLUTION: An immersion type membrane separator 22 is fixed and held on the bottom part of a treatment tank 21 by the fixing means 24 interposed between the wall member forming the ceiling part of the treatment tank 21 and the membrane separator 22 in a freely detachable manner. The fixing means 24 consists of the tank side cable fixing part 26 composed of the U-shaped ring member provided to the opening edge part of the treatment tank 21, the apparatus side cable fixing part 27 composed of the U-shaped ring member provided to the upper end part of the immersion type membrane separator 22, the taking in and out cable 28 connected and fixed to the apparatus side cable fixing part 27 at one end thereof and fixed and tied to the tank side cable fixing part 26 at the other end thereof and the tubular support 29 permitting the insertion of the taking in and out cable 28 to be interposed between the tank side cable fixing part 26 and the apparatus side cable fixing part 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating prevention structure for an immersion type membrane separation device used in water treatment technology such as human waste treatment and joint treatment.

[0002]

2. Description of the Related Art Conventionally, in water treatment technology, a membrane separation device has been used for the purpose of solid-liquid separation with respect to activated sludge and the like, for example, there is one as shown in FIG. In FIG. 6, the submerged membrane separation device 1 has a casing 2 having upper and lower open ports, and the casing 2 includes a membrane case 5 that encloses a plurality of filtration membrane cartridges 3 therein to form an upper structure. The air diffusing device 6 is separately formed into an air diffusing case 7 that forms a lower structure.

Inside the membrane case 5, a plurality of flat plate-shaped filtration membrane cartridges 3 are arranged in parallel in the vertical direction and at appropriate intervals. The filtration membrane cartridge 3 is provided with filtration membranes 9 covering both front and back sides of the filtration plate 8, and a membrane permeate liquid flow path (not shown) provided in the filtration plate 8.
Is opened on the back surface of the filtration membrane 9, and a membrane permeate outlet 10 communicating with the membrane permeate flow channel is provided at the upper edge of the filter plate 8. The membrane permeated liquid outlet 10 communicates with a collecting pipe 12 via a membrane permeated liquid take-out tube 11, and the collecting pipe 12 communicates with a suction means (not shown) such as a suction pump.

Air diffuser 6 disposed inside air diffuser case 7
Is connected to a blower 13 located below the filtration membrane cartridge 3 and outside the treatment tank (not shown) in which the membrane separation device 1 is immersed, through an aeration gas supply pipe 14.

In such a structure, when the liquid to be treated such as the activated sludge mixed liquid stored in the treatment tank is filtered, the membrane permeate flow of the filter plate 8 is passed through the collecting pipe 12 and the membrane permeate take-out tube 11. The suction pressure acts on the passage, and the membrane permeated liquid that has permeated the filtration membrane 9 of each filtration membrane cartridge 3 and flowed into the membrane permeated liquid channel of the filter plate 8 passes through the membrane permeated liquid take-out tube 11 and the collecting pipe 12 to the outside of the system. Flows out to.

At this time, the aeration gas such as air is supplied from the blower 13 to the air diffuser 6 through the gas supply pipe 14 for aeration, and by the agitation upward flow of the gas-liquid mixed phase generated by the air lift action of the aeration gas. The liquid to be treated is caused to flow parallel to the membrane surface of the filtration membrane 9, and the liquid to be treated flows over the membrane surface of the filtration membrane 9 as a sweep stream, thereby suppressing the formation of a cake layer on the membrane surface.

[0007]

In the above structure, since the upward stirring flow acts as a force for urging the membrane separation device upward, in order to stably hold the membrane separation device in the treatment tank. , The weight of the membrane separator itself,
It is necessary to fix the membrane separation device to the bottom of the processing tank. On the other hand, during regular maintenance, etc., the entire membrane separation device or the filtration membrane cartridge is taken out of the tank for the purpose of cleaning the filtration membrane, so it is necessary to take the membrane separation device in and out through the opening in the ceiling of the processing tank. There is.

Therefore, when the weight of the membrane separation device is increased by the weight, there is a problem that the labor required for taking out the membrane separation device becomes large, and when the treatment tank is small, the membrane separation device is attached to the treatment tank. Since it is difficult to perform the fixing and releasing operations in the tank, there is a problem that the structure for fixing the membrane separation device to the bottom of the processing tank cannot be adopted.

The present invention is intended to solve the above-mentioned problems, and it is possible to prevent the membrane separation device from rising in the treatment tank and to allow the membrane separation device to be easily taken in and out of the treatment tank. An object is to provide a floating prevention structure for a device.

[0010]

In order to solve the above-mentioned problems, the floating prevention structure of the immersion type membrane separation device of the present invention comprises:
In a membrane separation device that moves in and out from the inside and outside of the treatment tank through an opening formed in the ceiling of the treatment tank, the membrane separation device must move from the bottom of the treatment tank to the ceiling between the ceiling of the treatment tank and the membrane separation device. The fixing means for preventing the above is detachably interposed.

The fixing means has one end connected and fixed to the device-side cord fixing part provided in the membrane separation device, and the other end fixed to the tank-side cord fixing part provided in the wall of the treatment tank. It consists of an in-and-out cord and a tubular strut body which is inserted between the in-and-out cord and is interposed between the device-side cord-fixing part and the tank-side cord-fixing part. The strut body provides rigidity to the in-and-out cords in a state of being stretched between the cord-fixing portion and the device-side cord-fixing portion.

Here, the tubular support body may be a multi-joint body composed of a plurality of joints, and the joints may be detachably fitted to each other at their ends. The fixing means has one end connected and fixed to a device-side cord fixing part provided in the membrane separation device, and the other end fixed to a tank-side cord fixing part provided in the wall of the treatment tank. Body, and a column body that is inserted between the membrane separating device and the cord fixing portion by inserting the cord for insertion and exit into the ring portions provided at both ends. In the state of being stretched between the equipment-side rope fixing portion, the ring portions at both ends of the support body are joined to the equipment-side rope body fixing portion and the tank-side rope body fixing portion, respectively, and the support body is fixed to the equipment-side rope body. Rigidity is imparted to the in-and-out cords between the portion and the tank-side cord fixing portion.

Further, the air diffuser is fixedly attached to the casing of the membrane separation device, one end of the air diffuser is connected and fixed, the connecting pipe is erected, and the other end of the connecting pipe is treated. The diffuser gas supply pipe fixed to the wall of the tank is detachably connected and fixed to form a fixing means for fixing and holding the membrane separation device in the treatment tank.

Further, the casing of the membrane separation device is formed by dividing it into a membrane case containing a filtration membrane cartridge to form an upper structure and an air diffuser case containing an air diffuser to form a lower structure. Attach the air diffuser fixedly to the air diffuser case,
One side end is connected and fixed to the air diffuser, and the connection pipe is erected, and the other end of the connection pipe is detachably connected and fixed to the gas supply pipe for air diffusion fixed to the wall of the processing tank. By doing
A fixing means for fixing and holding the lower structure of the membrane separation device in the treatment tank is constituted, and a separate fixing means is detachably interposed between the upper structure of the membrane separation device and the treatment tank, and the upper part of the membrane separation device is attached. The structure and the lower structure are separately fixed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, an immersion type membrane separation device 22 is arranged inside the treatment tank 21, and the immersion type membrane separation device 22 extends from the opening formed in the ceiling of the treatment tank 21 to the inside and outside of the treatment tank 21. It has a shape that allows it to be taken in and out, and a lid 23 is provided to cover the opening.

The submerged membrane separation device 22 is fixed in a state of landing on the bottom of the processing bath 21 by a fixing means 24 which is detachably interposed between the immersion type membrane separation device 22 and the wall forming the ceiling of the processing bath 21. keeping. The fixing means 24 is a tank-side cord fixing portion 26 formed of a U ring member provided on the opening edge portion 25 of the processing tank 21.
And a device-side cord fixing part 27 formed of a U ring member provided at the upper end of the submerged membrane separation device 22, and a device-side cord fixing part 27.
One end is connected and fixed to the tank, and the other end is secured to the tank-side cord fixing part 26, and the in-and-out cord 28 is inserted into the tank-side cord fixing part 26 and the device side. Cord fixing part 2
7 and a tubular pillar body 29 that is interposed between the pillar body 29 and the column 7.
6 provides rigidity to the in-and-out cords 28 in a state where the cords 6 are stretched between the cord 6 and the device-side cord-fixing portion 27. The column body 29 may be formed of a multi-node body including a plurality of nodes, and the nodes are detachably fitted to each other at their ends to ensure the rigidity as a whole.

The submerged membrane separation device 22 includes a plurality of flat plate-shaped filtration membrane cartridges 31 and an air diffuser 32 inside a casing 30 having upper and lower openings.
The filtration membrane cartridges 31 are arranged in parallel along the up-down direction and with an appropriate distance between the opposing membrane surfaces. The casing 30 is formed by connecting a pair of slit panels 33 arranged opposite to each other with a pair of side panels 34. The slit panel 33 and the side panel 34 are formed on the inner surface of the slit panel 33. It is fastened and fixed by fastening bolts 35 in a state where the flange portions are brought into contact with each other. In the slit panel 33, a plurality of slits 36 are formed on the inner surface along the vertical direction and at appropriate distances, and the filtration membrane cartridges 31 are arranged by being inserted into the slits 36. As shown in FIG. 3, a stopper 37 is provided on the lower side of the slit panel 33.
Is provided and the stopper 37 is provided with the filtration membrane cartridge 3
It receives the lower end of 1.

The air diffusing device 32 has an air diffusing pipe 38 disposed below the filtration membrane cartridge 31, and both ends of the diffusing pipe 38 are projected from the pipe holes formed in the slit panels 33, 33, respectively. Slit panel 33, 33
It has been placed over. The air diffuser 38 is provided with a slit 39, 33 between both ends of a plug 39 mounted on one end of the pipe and an L-shaped pipe fitting 40 mounted on the other end of the pipe. Is fixed to the casing 30 by sandwiching it, and is connected to the pipe joint 40 to connect the diffusing pipe 41.
There is standing. A bracket 42 is integrally formed on the outer side of the upper end of the slit panel 33 on one side, and the air diffusing pipe 41 projects upward by inserting a pipe hole formed on the bracket 42 on the upper side of the air diffusing pipe 41, and is externally fitted to the upper end. The fitted pipe joint 43 locks the diffuser pipe 41 in the axial direction of the pipe, and the pipe joint 43 is connected to the diffuser gas supply source by connecting and separating connection pipe 44. There is.

The filtration membrane cartridge 31 is provided with filtration membranes 46 covering both front and back sides of the filtration plate 45, and a membrane permeate flow passage (not shown) provided in the filtration plate 45 is a filtration membrane 46.
A membrane permeate outlet 47, which opens at the back surface of the membrane and communicates with the membrane permeate channel, is provided at the upper edge of the filter plate 45. At the upper end of the casing 30, a collecting pipe 48 that communicates with the membrane permeated liquid outlet 47 of each filtration membrane cartridge 31 is provided.

The collecting tube 48 has a cylindrical elastic body 49 made of a rubber material, a soft resin material or the like to form a body portion, and covers the cylindrical elastic body 49 to make the outer shell 5 having rigidity made of vinyl chloride or the like.
The outer shell 50 has a slit at the portion contacting the filtration membrane cartridge 31, and the tubular elastic body 49 is elastically fitted to the membrane permeate outlet 47 along the slit. An insertion port 51 is provided. Cylindrical elastic body 49
Has a plug 52 at one end and an L-shaped pipe joint 54 at the other end via a connecting short pipe 53, and a membrane permeate outlet pipe 55 is connected to the pipe joint 54. The collecting pipe 48 is fixed to the flange portion at the upper end of the casing 30 by U-shaped fixtures 56 on both sides, and presses each filtration membrane cartridge 31 downward through the tubular elastic body 49, thereby each filtration membrane cartridge. The vibration generated in each filtration membrane cartridge 31 is absorbed by the retaining of 31 and the air diffusion.

With the above-described structure, the support column 29 provides rigidity to the in-and-out cords 28 when the in-and-out cords 28 are extended between the tank-side cord-fixing portion 26 and the apparatus-side cord-fixing portion 27. , Tank side cord fixing part 26 and device side cord fixing part 2
Since the distance between 7 is maintained, the immersion type membrane separation device 22 does not float upward, and the immersion type membrane separation device 22 is fixedly held in a state of landing on the bottom of the treatment tank 21.

When the immersion type membrane separation device 22 is pulled up for maintenance or the like, the lid 23 is removed to open the opening of the processing tank 21, and the connection between the connection pipe 44 and the gas supply source for aeration is released. Then, the in-and-out cords 28 are released from the tank-side cord-fixing portion 26, the support columns 29 are taken out, and then the in-and-out cords 28 are manually pulled to pull up the submerged membrane separation device 22. Therefore, the work of taking out the immersion type membrane separation device 22 can be easily performed from the outside of the processing tank 21, and since no weight or the like is required, the work of taking out can be reduced. Further, the in-and-out cords, which are means for moving the immersion type membrane separation device 22 in and out, can be utilized as a member of a fixing means for fixing and holding the immersion type membrane separation device 22 in the processing tank 21. Can be simplified.

When the support column 29 is composed of a multi-segment body, the ingress / egress cord body 28 is relaxed between the tank-side cord body fixing portion 26 and the apparatus-side cord body fixing portion 27, and Immersion type membrane separation device 2
2 can be pulled up, and the support column 29 is used for the access cord 2
No need to remove from 8.

FIG. 4 shows another embodiment of the present invention. In FIG. 4, the column body 60 is provided with ring portions 61 at both ends of the actual shaft body.
Is inserted through each ring portion 61 of the pillar body 60. Furthermore, the in-and-out cords 28 are inserted through the tank-side cord-fixing portion 26 and the device-side cord-fixing portion 27, and the retaining rings 6 are provided at both ends.
2 is tied up.

In this structure, the immersion type membrane separation device 22
In order to fix and hold the same in a state of landing on the bottom of the processing tank 21, the column body 60 is extended in a state where the in-and-out cords 28 are extended between the tank-side cord fixing portion 26 and the apparatus-side cord fixing portion 27. The ring portions 61 at both ends of the column body are joined to the tank-side cord body fixing portion 26 and the apparatus-side cord body fixing portion 27, respectively, and the column body 60
Thus, rigidity is imparted to the in-and-out cords 28 between the tank-side cord-fixing portion 26 and the device-side cord-fixing portion 27. Other functions and effects are similar to those of the previous embodiment.

FIG. 5 shows another embodiment of the present invention. Members that perform the same operations as those in the above-described embodiment are designated by the same reference numerals, and description thereof will be omitted. In FIG. 5, a storage tank 71 provided adjacent to the processing tank 21 stores the membrane permeated liquid that has permeated the submerged membrane separation device 22, and the membrane permeated liquid is discharged to the outside of the system in the storage tank 71. A drainage pipe 72 is in communication, and a drainage pump 73 is interposed in the middle of the drainage pipe 72. Immersion-type membrane separation device 22 immersed in treatment tank 21
Communicates with the storage tank 71 through the membrane permeated liquid outlet pipe 55,
The front end opening of the membrane permeated liquid outlet pipe 55 is located below the liquid surface of the processing tank 21, and has a detachable coupler joint 74 in the middle thereof.

A gas supply pipe 75 for diffusing gas which is fixedly held by the wall of the processing tank 21 near the opening of the ceiling of the processing tank 21.
Is opened, and the base end of the gas diffusion gas supply pipe 75 communicates with the blower 76 which is a gas diffusion gas supply source. A connecting pipe 44 of the submerged membrane separation device 22 is detachably connected and joined to the air diffusion gas supply pipe 75 by flange coupling.

In this structure, the connection pipe 44 forming a flow path for supplying the gas for diffusion diffuses the immersion type membrane separation device 22 to the bottom of the treatment tank 21 and fixes and holds it. It can also serve as a means. Therefore, at the time of taking out the immersion type membrane separation device 22, the coupler joint 74 is separated and the diffused gas supply pipe 7 is used.
The fixing means can be released by releasing the connection between the connection pipe 5 and the connecting pipe 44, and the structure and the attaching / detaching operation can be simplified.

In the submerged membrane separation device 22, the casing 30 encloses the filtration membrane cartridge 31 to form the upper structure, and the aeration device 32 encloses the air diffusion device 32 to form the lower structure. It can also be formed by dividing into and.

In this case, since the air diffuser 32 is fixedly attached to the air diffuser case 76, a fixing means for fixing and holding the lower structure of the submerged membrane separation device 22 in the processing tank is provided by the connecting pipe 44. Configure. On the other hand, the immersion type membrane separation device 2
The structure of the fixing means described above, that is, the tank-side cord-fixing portion 26, the device-side cord-fixing portion 27, and the in-and-out cords 28, between the membrane case 76 that forms the upper structure of 2 and the treatment tank 21. A structure including the support columns 29 or 60 is provided.

With this configuration, the upper structure and the lower structure of the submerged membrane separation apparatus 22 can be separately fixed and held, and during maintenance, only the upper structure can be taken out as needed, and the labor in the taking-out work can be done. Can be reduced.

[0032]

As described above, according to the present invention, the fixing means is detachably interposed between the ceiling part of the processing tank and the membrane separation device, and the fixing means is composed of the ingress / egress rope and the column body. By doing so, the work of taking out the membrane separation device can be easily performed from the outside of the processing tank, and since no weight or the like is required, the work of taking out can be reduced. In addition, the pipe system for supplying the diffused gas is separated into membranes by detachably connecting and fixing the connecting pipe fixedly connected to the diffuser to the diffuser gas supply pipe fixed to the wall of the processing tank. It can be used as a fixing means of the device. Further, the casing of the membrane separation device is divided into a membrane case and an air diffusion case, and the lower structure of the membrane separation device is fixed by a fixing means composed of a piping system such as a connecting pipe. By fixing the structure with the fixing means composed of the in-and-out cords and the pillars, only the upper structure can be taken out as needed, and the labor in the taking-out work can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an immersion type membrane separation device showing an embodiment of the present invention.

FIG. 2 is a perspective view of the immersion type membrane separation device in the same embodiment.

FIG. 3 is a cross-sectional view of the immersion type membrane separation device in the same embodiment.

FIG. 4 is an explanatory view showing a fixing structure of an immersion type membrane separation device according to another embodiment of the present invention.

FIG. 5 is an explanatory view showing a fixing structure of an immersion type membrane separation device according to still another embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional immersion type membrane separation device.

[Explanation of symbols]

 21 Processing Tank 22 Immersion Type Membrane Separation Device 23 Lid 24 Fixing Means 26 Tank Side Cord Fixing Part 27 Device Side Cord Fixing Part 28 Entry / Exit Cord 29 Strut Body

Front page continuation (72) Inventor Masahiro Yata 1-247 Shikitsu Higashi, Naniwa-ku, Osaka City, Osaka Prefecture Kubota Co., Ltd. No.47 In Kubota Co., Ltd. (72) Inventor Hidehiko Sakai 1-247 Shikitsu Higashi, Naniwa-ku, Osaka City, Osaka Prefecture In Kubota Co., Ltd.

Claims (6)

[Claims] 1. A membrane separation apparatus which is put in and taken out from the inside and outside of a treatment tank through an opening formed in a ceiling portion of the treatment tank,
Immersion type membrane separation device characterized in that a fixing means for preventing the membrane separation device from moving from the bottom of the tank toward the ceiling is detachably interposed between the ceiling part of the treatment tank and the membrane separation device. Anti-floating structure. 2. The fixing means has one end connected and fixed to a device-side cord fixing part provided in the membrane separation device, and the other end fixed to a tank-side cord fixing part provided in a wall of the treatment tank. An in-and-out cord, and a tubular strut body that is inserted between the in-and-out cord and is interposed between the device-side cord fixing portion and the tank-side cord fixing portion,
2. The immersion type membrane separation according to claim 1, wherein the support column provides rigidity to the access cord when the access cord is extended between the tank-side cord fixing portion and the device-side cord fixing portion. Device floating prevention structure. 3. The immersion type membrane according to claim 2, wherein the tubular columnar body is a multi-node body composed of a plurality of nodes, and the nodes are detachably fitted to each other at their ends. Floating prevention structure for separation device. 4. The fixing means has one end connected and fixed to a device-side cord fixing part provided in the membrane separation device, and the other end fixed to a tank-side cord fixing part provided in a wall of the treatment tank. It is composed of an entrance / exit rope, and a column body which is inserted between the membranes of the membrane separation device and the rope fixing portion by inserting the entrance / extraction rope into the ring portions provided at both ends. In the state of being stretched between the body fixing part and the device-side cord fixing part, the ring parts at both ends of the supporting column are joined to the device-side cord fixing part and the tank-side cord fixing part, respectively, and the supporting column is attached to the device side. The floating prevention structure for the submerged membrane separation device according to claim 1, wherein rigidity is imparted to the in-and-out ropes between the rope fixing portion and the tank-side rope fixing portion. 5. An air diffuser is fixedly attached to the casing of the membrane separator, one end of the air diffuser is connected and fixed to establish a connecting pipe, and the other end of the connecting pipe is treated. 2. The fixing means for fixing and holding the membrane separation device in the treatment tank by detachably connecting and fixing to a gas supply pipe for air diffusion fixed to the wall of the tank. Floating prevention structure for the immersion type membrane separator. 6. The casing of the membrane separation device is formed by dividing it into a membrane case containing a filtration membrane cartridge to form an upper structure and a diffusion case containing a diffusion device to form a lower structure. The air diffuser was fixedly attached to the air diffuser, one end was connected and fixed to the air diffuser, and the connecting pipe was erected, and the other end of the connecting pipe was fixed to the wall of the processing tank. By detachably connecting and fixing to the gas supply pipe for air diffusion, a fixing means for fixing and holding the lower structure of the membrane separation device in the treatment tank is constituted, and a separate structure is provided between the upper structure of the membrane separation device and the treatment tank. 6. The fixing means according to claim 1 is removably interposed so that the upper structure and the lower structure of the membrane separation device are separately fixed.
A floating prevention structure for an immersion type membrane separation device according to any one of 1.