JP2000271452A - Structure of the spacing case in a multi-stack immersion type membrane separator - Google Patents

Abstract

(57) Abstract: In a multistage immersion type membrane separation device in which a plurality of membrane cartridge units in which a plurality of membrane cartridges are arranged are arranged in multiple stages via a spacing case, a tube for communicating the membrane cartridge with a water collecting pipe. To prevent abrasion. SOLUTION: Each membrane cartridge 1 is provided in an interval case 15.
The water collection pipe 20 formed with the connection nozzle 20A for the tube 18 communicating with the permeation side of the third nozzle is connected to the connection nozzle 20A.
Are integrally provided outside the case so as to penetrate the case wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an interval case in a multistage immersion type membrane separation apparatus used for sewage treatment, sludge concentration, and the like.

[0002]

2. Description of the Related Art An immersion type membrane separator 1 as shown in FIGS. 5 to 6 is one of solid-liquid separators used for sewage treatment and sludge concentration. This membrane separation device 1 has a flat membrane cartridge 3 arranged in an upper part in a casing 2 and an air diffuser 4 provided below the same, and the inside of a treatment tank 5 has a number corresponding to the amount of treated water. In a state in which raw water 6 is continuously introduced and diffused by the diffuser 4, the liquid 7 to be treated in the tank is filtered by the membrane cartridge 3, and the permeated water that has passed through the membrane surface is passed through the tube 8. Water collecting pipe 9, permeated water outlet pipe 10
Through the tank. In order to facilitate transportation and maintenance, the casing 2 is often divided into a membrane case 2a that houses the membrane cartridge 3 and an air diffusion case 2b that houses the air diffusion device 4.

[0003] The membrane separation device 1 exhibits excellent performance in separating high-concentration activated sludge and the like, and has a large membrane area per unit installation area (corresponding to the number of installed membrane cartridges 3). The capacity of the processing tank 5 can be reduced as compared with the case where a type of membrane separation device is used,
It is widely accepted that operation and maintenance are easy.

[0004]

However, conventionally, a plurality of membrane separation devices 1 are arranged in parallel at intervals, that is, in a planar manner. Therefore, the number of membrane cartridges 3 to be installed is reduced from the viewpoint of tank filling efficiency. Is not necessarily large, and the advantage that the capacity of the processing tank can be reduced cannot be fully utilized.

[0005] For this reason, the present inventors have filed Japanese Patent Application No. 10-334.
No. 835 proposes a multi-layer case in which a plurality of membrane cases are stacked via an interval case.
Since the tube that connects the membrane cartridge and the water collection tube penetrates through the spacing case, it is necessary to take measures such as arranging rubber packing to prevent wear of the tube and through hole due to vibration caused by air diffusion. Was.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to prevent wear of a tube communicating a membrane cartridge and a water collecting pipe without disposing a rubber packing.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of rigid plate-like membrane cartridges having a membrane surface arranged in a vertical direction inside a membrane case having an open top and bottom. A membrane case unit is configured by arranging with a fixed gap therebetween, and a plurality of membrane case units are
In a multi-stage immersion type membrane separation device, which is arranged in multiple stages via an interval case forming an open space between the membrane cases and provided with an air diffusion case provided with an air diffusion device below the lowermost membrane case unit. In the interval case, a water collecting pipe communicating with a means for leading the permeated water to the outside of the tank is integrally provided outside, and a nozzle connected to a tube communicating with the permeating side of each membrane cartridge is penetrated through the case wall. It is provided.

Further, according to the present invention, in the above structure, a membrane retainer for abutting on upper ends of a plurality of membrane cartridges arranged below and holding each membrane cartridge at a predetermined position is detachably provided inside the spacing case. It is characterized by having. According to the above configuration, the nozzle formed in the water collection pipe is opened inside the spacing case, and the nozzle connected to the tube communicating with the permeation side of each membrane cartridge is connected to the spacing case as in the related art. The tube does not wear due to the contact of the tube, and the air lock caused by the inverted U-shaped arrangement of the tube can be reduced.

In the case where the film holder is provided inside the space case, the film holder can be arranged at a predetermined position by mounting the space case on the film case unit. Thus, the lower membrane cartridge can be prevented from floating due to the weight of the upper membrane case unit.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The membrane separation device 11 shown in FIG.
In the above, a plurality of rigid plate-like membrane cartridges 13 (thickness of about 6 m
m) are arranged in such a manner that the film surfaces are arranged in a vertical direction and a predetermined gap is provided between the film surfaces (usually 6 to 10 mm) to constitute a film case unit 14. The formed film case units 14 are vertically arranged in two stages. In addition to the arrangement, an interval case 15 that forms an open space between the membrane cases 12 is provided, and an air diffusion case 17 in which an air diffusion device 16 is provided is provided below the lower membrane case unit 14.

The membrane cartridge 13 is shown in FIGS.
A filter membrane sheet 13B is provided on both surfaces of a rigid filter plate 13A made of ABS resin or the like.
Is placed and adhered (or welded) around the membrane,
Between the filter plate 13A and the filter membrane sheet 13B, and the filter plate 1
A permeated water outlet 13D communicating with a permeated water channel 13C formed inside 3A is provided in the filter plate 13A. The filtration membrane sheet 13B is formed by applying (coating) a polyolefin-based resin or the like to a nonwoven fabric or the like as a support and integrally forming the same.

A slit 12A is formed on the inner surface of each membrane case 12 to insert the peripheral edge of the membrane cartridge 13, and a diffusion opening 17A for the liquid to be treated is formed in the diffuser case 17.
Is formed. The water collecting pipes 19 and 2 communicating with the permeated water outlet 13D of the membrane cartridge 13 via the tube 18 are connected to the upper membrane case 12 and the interval case 15, respectively.
0, and film retainers 21 and 22 for preventing the floating of each film cartridge 13 are provided along a direction intersecting the film surface.

The spacing case 15 is as shown in detail in FIGS. 3 and 4, and has the water collecting pipe 20 integrally provided outside. The collecting pipe 20 is provided for each membrane cartridge 13.
A plurality of nozzles 20A which are located along the direction intersecting with the film surface and are formed at intervals along the axial direction thereof penetrate the case wall and are open inside the case. Tube 18 is connected.

A pair of the above-mentioned film retainers 22 are provided inside the lower portion of the space case 15. The film retainer 22 includes a retainer plate 23 made of an elastic resin such as rubber, and a mounting angle 24 fixed on the upper surface of the retainer plate 23 with an adhesive or the like. Are mounted so as to be adjustable in height by bolts 25 and nuts 26. The membrane cartridge 1 is provided on the lower surface of the holding plate 23.
A comb tooth 23A that fits into the gap between the three is formed.

Reference numeral 27 denotes a permeated water outlet pipe disposed between the collecting pipes 19 and 20 and a treated water tank (not shown) outside the tank, 28 denotes a pump device interposed in the permeated water outlet pipe 27, and 29 denotes a blower. An air supply source such as an air supply and a compressor, and 30 is an air supply pipe disposed between the air supply source 29 and the air diffuser 16. The operation of the above configuration will be described.

In a state where the membrane separation device 11 is immersed and installed in the activated sludge mixed solution 32 of the treatment tank 31 for performing biological treatment, raw water 33 is continuously introduced and diffused through the diffuser 16 while being pumped. 28 applies a suction pressure. Depending on the water quality of the raw water 33, air is diffused even with a separate air diffuser (not shown) so as not to run out of oxygen. By doing so, an upward flow of the activated sludge mixed liquid 32 is generated by the air lift action of the diffused air, and the upward flow of the gas-liquid mixed liquid generates a circulating flow through the flow opening 17A inside and outside the apparatus. Activated sludge mixture 32
Are sufficiently stirred and mixed, and the chance of contact with activated sludge, oxygen and pollutants is increased, and efficient activated sludge treatment is performed.

While the gas-liquid mixed ascending flow sequentially flows into the membrane case units 14 arranged in two stages and passes through the gap between the membrane cartridges 13, the active flow is activated on the membrane surface of each membrane cartridge 13. The sludge mixture 32 is subjected to cross-flow filtration, passes through the filtration membrane sheet 13B, and passes through the permeated water flow path 1.
The permeated water flowing into the 3C is guided to the treated water tank through the permeated water outlet 13D, the tubes 18, the water collecting pipes 19 and 20, and the permeated water outlet pipe 27, and the membrane surface of the membrane cartridge 13 is washed by the gas-liquid mixed upward flow. In addition, the concentration efficiency is high because concentration polarization is prevented.

At this time, by arranging the membrane case units 14 in multiple stages (here, two stages), the gas-liquid mixture rises over the plurality of membrane case units 14 as described above by the air diffuser 16 at the lower part of the device. Since the flow can be caused, the amount of air diffused per one membrane cartridge 13 can be reduced.
Further, since the installation area of the apparatus per one of the membrane cartridges 13 can be reduced, a sufficient gap can be provided around the apparatus to prevent the drift, and the local deposition of the cake layer and the clogging between the membranes can be prevented.

Further, a space case 15 is provided between the membrane cases 12.
Intervening, the bubble flow that constitutes the gas-liquid mixed ascending flow once diffuses in the open space and then flows uniformly into the gap between the upper membrane cartridges 13, which also causes the localization of the cake layer. It is possible to prevent deposition and clogging between the films due to the deposition. On the other hand, when the space case 15 is not provided, the position of the upper and lower membrane cartridges 13 may be slightly shifted to form a step or a gap. At that time, the gas-liquid mixed ascending flow cannot flow smoothly. Since activated sludge and contaminants (such as hair and fibers) are deposited, high installation accuracy is required.

In addition, since the nozzle 20A of the water collecting pipe 20, which is integral with the spacing case 15, is open inside the case, and the tube 18 is connected to the nozzle 20A, the spacing case 15 can be provided without rubber packing. The gas-liquid mixed flow inside the case can be guided to the upper membrane case 12 without leakage without drawing in the activated sludge mixed liquid 32 outside the case while maintaining the water tightness, and the occurrence of drift can be prevented.
Further, since there is no contact between the tube 18 and the spacing case 15, the problem of wear of the tube 18 and the insertion hole can be avoided, and the tube 18 is formed by a gentle bend.
And the airlock caused by the inverted U-shaped arrangement of the tube 18 can be reduced.

Further, since the film presser 22 is attached to the inside of the lower portion of the space case 15, the film presser 22 can be arranged at a predetermined position by placing the space case 15 on the film case 12, and By utilizing the weight of the membrane case unit 14, the spacing case 15 itself can be pressed, and the spacing cartridge 15 can hold the membrane cartridge 13. Therefore, there is no need to separately install the film holder 21 of the film case unit 14 above.

Further, the membrane retainer 22 is connected to the spacing case 15 by the bolt 2 in the elongated hole 24A of the mounting angle 24.
5, the nut 26 is used to adjust the height, that is, the pressing strength, when mounting or when the presser plate 22 is worn.
The entire exchange is easy.

[0023]

As described above, according to the present invention, when arranging a plurality of membrane case units in which a plurality of membrane cartridges are arranged via a spacing case in multiple stages, a water collecting pipe having a connection nozzle opened inside the case. Is provided integrally with the spacing case, the penetration of the spacing case of the tube communicating the membrane cartridge and the water collecting tube can be eliminated, and the wear of the tube can be avoided. In addition, since the rubber packing conventionally arranged around the tube can be eliminated,
The trouble of detachment and deterioration of the rubber packing can be eliminated, and the number of parts can be reduced to realize a simple device configuration. The air lock due to the inverted U-shaped arrangement of the tubes can also be reduced.

By providing the film holder inside the space case, the film holder can be arranged at a predetermined position by placing the space case on the film case, and utilizing the weight of the upper film case unit. Thus, the spacing case itself can be fixed and the lower membrane cartridge can be prevented from floating.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a multi-stacked immersion type membrane separation device having a spacing case according to an embodiment of the present invention is immersed and installed in a processing tank.

FIG. 2 is an explanatory view of a membrane cartridge arranged in the multi-stage immersion type membrane separator.

FIG. 3 is an enlarged vertical sectional view of the spacing case shown in FIG.

FIG. 4 is a partially enlarged side view showing the same spacing case from inside.

FIG. 5 is a perspective view of a conventional membrane separation device.

FIG. 6 is an explanatory view showing a state where the membrane separation device is immersed and installed in a processing tank.

[Explanation of symbols]

 12 Membrane case 13 Membrane cartridge 14 Membrane case unit 15 Spacing case 16 Air diffuser 17 Air diffuser case 18 Tube 20 Water collecting tube 20A Connection nozzle 22 Membrane presser

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 11/12 C02F 11/12 E (72) Inventor Kiyoji Izumi 1-chome, Shikitsuhigashi, Namiwa-ku, Osaka-shi, Osaka No. 2-47 Kubota Co., Ltd. (72) Inventor Masaharu Nishi 2-chome No. 2-47, Kubota Co., Ltd. (72) Inventor Hidehiko Sakai Shikitsu Higashi, Naniwa-ku, Osaka, Osaka 1-chome 2-47 F-term in Kubota Corporation (reference) 4D006 GA02 HA41 HA93 JA07A JA19A JA25A JA25B JA31A JA56A JA70A KA43 KA63 PA02 PB08 PC64 4D028 BC17 BC24 BD17 4D059 AA03 BE42 BE51

Claims (2)

[Claims] 1. A membrane case unit having a plurality of rigid plate-like membrane cartridges arranged in a vertical direction with a constant gap between the membrane surfaces inside a membrane case having an open top and bottom. Comprising, a plurality of membrane case units, arranged in multiple stages via an interval case forming an open space between the membrane cases, below the lowermost membrane case unit,
In the multi-stage stacking immersion type membrane separation device provided with an air diffuser case internally provided with an air diffuser, the interval case is provided integrally with a water collection tube to which a permeated water deriving unit communicating with the outside of the tank is integrally provided outside. And a nozzle connected to a tube communicating with the permeation side of each membrane cartridge is provided through the case wall to provide a spacing case structure in the multi-stack immersion type membrane separation device. 2. A membrane retainer for holding a membrane cartridge at a predetermined position in contact with an upper end of a plurality of membrane cartridges arranged below is detachably provided inside the spacing case. 2. The structure of a spacing case in the multi-stage immersion type membrane separation device according to 1.