JP2002361051A - Membrane cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a membrane cartridge capable of arranging the membrane cartridge in vertically overlapped form in series without necessitating a spacer case. SOLUTION: The membrane cartridge is arranged along a vertical direction in a membrane case 1 arranged in vertically overlapped form over an air diffuser 23, and a filter membrane 6 is arranged on the surface of a filter plate 5, and a water collecting hole 7 communicating with a permeated liquid flow passage formed between the filter plate 5 and filter membrane 6 is formed at the filter plate 5, and a permeated liquid take-out port 8 arranged at the upper side edge of the filter plate 5 communicating with the water collecting hole 7 is projectingly provided to outside from a notched part 4 formed at the upper end of the membrane case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane cartridge, and relates to a technique relating to a submerged membrane separation apparatus used for sewage treatment.

[0002]

2. Description of the Related Art Conventionally, in an immersion type membrane separation apparatus 21 as shown in FIGS. 3 and 4, for example, a plurality of flat membrane cartridges 22 and an air diffuser 23 for jetting a membrane cleaning gas from underneath. Are arranged inside the case 24. Case 2
4 is divided into a membrane case 25 and a diffuser case 26, and the diffuser case 26 has a shape in which the entire amount of the membrane surface cleaning gas ejected from the diffuser 23 is guided into the membrane case 25.

The membrane cartridge 22 includes a filter plate 22 made of resin.
A filtration membrane 22B is arranged on both surfaces of A to form a permeate flow path between the filter plate 22A and the filtration membrane 22B, and water collecting holes 22C communicating with the permeate flow path penetrate the front and back of the filter plate 22A. A permeate outlet 22D communicating with the water collecting hole 22C is formed at the upper end edge of the filter plate 22A.

Each membrane cartridge 22 is provided with a permeate outlet 2
It communicates with a water collecting pipe 28 via a tube 27 connected to the 2D, and the water collecting pipe 28 communicates with a permeated liquid outlet pipe 29 for extracting a permeated liquid. A pressing plate 30 for preventing the membrane cartridge 22 from floating is provided above the membrane cartridge 22.

[0005] When this membrane separation device 21 is used,
The membrane separation device 21 is immersed in the activated sludge mixture in the aeration tank, and aeration air is blown out from the aeration device 23. In this state, the activated sludge mixture is supplied to the membrane surface in a cross flow by an ascending flow generated by aeration air spouting from the diffuser 23, and the water head in the tank is used as a driving pressure to drive the membrane cartridge 2
2 through which gravity filtration (suction filtration is possible by interposing a suction pump in the permeated liquid outlet pipe 29). The permeate that has passed through the membrane surface of the membrane cartridge 22 is led out of the tank through a permeate outlet pipe 29 as treated water.

[0006] The upward flow accompanied by the aerated air ejected from the air diffuser 23 flows along the surface of the membrane, thereby cleaning the surface of the membrane cartridge 22 and suppressing a decrease in the separation function. Prevent dysfunction.

[0007]

However, the area where the membrane separator 21 can be installed in the aeration tank is limited, and it may be difficult to arrange a plurality of membrane separators 21 in parallel. For this reason, it is required to arrange the membrane cartridges 22 in a vertically stacked manner.

However, since the membrane separator 21 has a structure in which the tube 27 and the water collecting pipe 28 are arranged above the membrane cartridge 22, a separate membrane case 25 accommodating a plurality of membrane cartridges 22 is used. It is difficult to directly overlap the upper part, as shown in FIG. 5, even if the water collecting pipe 28 is arranged outside the membrane case 25, the spacer case 31 for securing a space for disposing the tube 27 is connected to the upper and lower membrane cases. It is necessary to interpose between 25.

In this case, since the spacer case 31 forms a flow path surrounding the tube 27, the tube 27 present in the flow path acts as a resistance and disturbs the flow of the cross flow flowing into the upper membrane case 25. As a result, the effect of cleaning the film surface is reduced. In addition, the height of the apparatus is increased by the spacer case 31 higher than the height of the additional membrane case, and the required water depth of the aeration tank is also increased by the increased height.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a membrane cartridge in which membrane cartridges can be arranged one above the other without a spacer case.

[0011]

In order to solve the above-mentioned problems, a membrane cartridge according to the present invention according to the first aspect of the present invention is provided along a vertical direction in a membrane case which is arranged vertically above an air diffuser. A filter membrane is arranged on the surface of the filter plate, and a water collecting hole communicating with a permeate flow path formed between the filter plate and the filter film is formed in the filter plate, and the water collecting hole is formed in the water collecting hole. A permeated liquid outlet, which communicates with the filter plate and is disposed on the upper edge thereof, is provided so as to protrude outward from a cutout formed at the upper end of the membrane case.

With the above structure, the permeate outlet is projected outward from the notch formed in the upper part of the membrane case, so that the water collecting pipe is arranged on the side of the membrane case and the permeate outlet is collected with the permeate outlet. A tube communicating with the water pipe can be arranged outside the membrane case.

For this reason, when the membrane cases are arranged one above the other, the cross-flow flowing from the lower membrane case to the upper membrane case is interposed between the membrane cartridges housed in each membrane case and arranged vertically in series. Since there is no tube that hinders the flow of water, a sufficient membrane surface cleaning effect can be exhibited for the membrane cartridge housed in the membrane case.

By arranging the water collecting pipes and tubes outside the side of the membrane case, it is possible to arrange the membrane case and the membrane case directly one on top of the other without interposing a spacer case, and it is necessary to provide an aeration tank. It is possible to suppress the water depth.

According to a second aspect of the present invention, there is provided the membrane cartridge, wherein an upper joint portion between the filter plate and the filter membrane at the upper end side of the filter plate is formed with an upward slope toward one upper edge of the filter plate. A permeate outlet disposed on one upper edge of the perforated liquid is provided near the upper joint, and the uppermost part of the water collecting hole is formed at a position close to the permeate outlet.

With the above structure, the air that has flowed into the permeate flow path between the filter plate and the filter membrane through the filter membrane rises along the filter plate, flows along the gradient of the upper joint, and flows into the water collecting hole. Flows into the water collecting hole from the uppermost part, and flows out of the membrane cartridge through the permeate outlet. Therefore, since air does not accumulate in the membrane cartridge and the filtration membrane can be constantly maintained at a flat surface, the cross flow uniformly flows along the membrane surface of the filtration membrane and becomes uniform with respect to the membrane surface of the membrane cartridge. Washing can be performed, and deterioration of the separation function can be suppressed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. Members having the same functions as those described above with reference to FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1 and FIG. 2, a pair of membrane cases 1 and 1 are vertically arranged above the air diffuser 23, and each membrane case 1 and 1 has an inner surface extending vertically. A plurality of membrane cartridges 3 are inserted into each slit 2 formed by
Are arranged in parallel with a predetermined gap therebetween, and a notch 4 is formed at the upper end of each membrane case 1, 1.

The membrane cartridge 3 has a filtration membrane 6 arranged on the surface of a filtration plate 5 and a permeate flow path between the filtration plate 5 and the filtration membrane 6. Water holes 7 are formed in the filter plate 5. The permeated liquid outlet 8 arranged on the upper edge of the filter plate 5 communicates with the water collecting hole 7 and protrudes outward from the notch 4 of the membrane case 1.

As shown in FIG. 2, a joint 9 between the filter plate 5 and the filter membrane 6 is present along the entire periphery of the filter membrane 6, and the filter plate 5 and the filter membrane 6 at the upper end side of the filter plate 5 are connected to each other. The upper joint 9a is formed with an upward slope toward one upper edge 5a of the filter plate 5, and a permeate outlet 8 is provided near the upper joint 7. The water collecting hole 7 is formed in an upward slope toward one upper edge 5 a of the filter plate 5, and the uppermost portion 7 a is formed at a position close to the permeated liquid outlet 8.

The water collecting pipe 28 is disposed on the side of the membrane case 1, and connects the permeated liquid outlet 8 to the water collecting pipe 28 by a tube 27 outside the membrane case 1. Hereinafter, the operation of the above configuration will be described. The permeated liquid outlet 8 protrudes outward from the notch 4 formed in the upper part of the membrane case 1 so that the water collecting pipe 28 is arranged on the side of the membrane case 1 and the permeated liquid outlet 8 and the water collecting pipe 28 Can be arranged outside the membrane case 1.

For this reason, when the membrane cases 1 and 1 are arranged one above the other, a water collecting pipe 2 is provided between the membrane cartridges 3 housed inside the respective membrane cases 1 and 1 and arranged vertically in series.
8 and the tube 27 do not exist, and there is no factor that hinders the flow of the cross flow flowing from the lower membrane case 1 to the upper membrane case 1. It can exhibit a good film surface cleaning effect.

By disposing the water collecting pipe 28 and the tube 27 outside the side of the membrane case 1, the membrane case 1 and the membrane case 1
Can be placed directly on top of each other without interposing a separate member for forming a space such as a spacer case, and the required water depth of the aeration tank can be suppressed.

During operation, a part of the aerated air diffused from the diffuser 23 flows through the filtration membrane 6 into the permeate flow path between the filter plate 5 and the filtration membrane 6. When the aerated air accumulates between the filter plate 5 and the filtration membrane 6, the membrane surface of the filtration membrane 6 undulates, and the washing function of the membrane surface by cross flow is hindered, and the separation function is reduced.

However, the air A that has passed through the filtration membrane 6 and flowed into the permeate flow path rises along the permeate flow path along the filter plate 5 together with the permeate B, and flows along the gradient of the upper joint 9a. ,
The water flows into the water collecting hole 7 from the uppermost portion 7a of the water collecting hole 7, and flows out together with the permeated liquid B into the tube 27 through the permeated liquid outlet 8.

Therefore, since air does not accumulate inside the membrane cartridge 3 and the filtration membrane 6 can always be kept flat, the cross flow uniformly flows along the membrane surface of the filtration membrane 6 and the membrane cartridge 3 The surface of the film can be uniformly washed, and a decrease in the separation function can be suppressed.

[0027]

As described above, according to the present invention, the water collecting pipe and the tube can be disposed outside the membrane case by projecting the permeated liquid outlet outward from the cutout on the upper side of the membrane case. When the membrane cases are placed one on top of the other, there is no water collecting pipe or tube between the membrane cartridges arranged in series one above the other, which can impede the flow of the cross flow. The effect can be demonstrated. The required water depth of the aeration tank can be suppressed by allowing the membrane case and the membrane case to be directly arranged one above the other without interposing the spacer case. By guiding the air that has flowed into the permeate flow path through the filtration membrane at the gradient of the upper junction and leading it to the permeate outlet,
Since air does not accumulate in the membrane cartridge and the filtration membrane can be constantly maintained on a flat surface, the cross-flow along the membrane surface of the filtration membrane is maintained uniformly to perform uniform cleaning on the membrane surface. And the deterioration of the separation function can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an immersion type membrane separation device according to an embodiment of the present invention.

FIG. 2 is a partially broken plan view showing the membrane cartridge according to the embodiment.

FIG. 3 is a perspective view showing a conventional immersion type membrane separation device.

FIG. 4 is a partially broken plan view showing a conventional membrane cartridge.

FIG. 5 is a cross-sectional view showing a conventional two-stage immersion type membrane separation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Membrane case 2 Slit 3 Membrane cartridge 4 Notch 5 Filter plate 5a Upper edge 6 Filtration membrane 7 Water collecting hole 7a Uppermost part 8 Permeate outlet 9 Joint 9a Upper joint 23 Air diffuser 24 Case 26 Air diffuser case 27 tube 28 water collecting pipe 29 permeated liquid outlet pipe 30 holding plate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D006 GA07 HA48 HA93 JA06A JA19A JA20A KA52 KA54 KA56 KA68 KC14 MA03 MB02 PA01 PB08

Claims (2)

[Claims] Claims: 1. A vertically arranged membrane case arranged vertically above a diffuser, wherein the membrane case is arranged vertically.
A filtration membrane is arranged on the surface of the filter plate, and a water collection hole communicating with the permeate flow path formed between the filter plate and the filtration membrane is formed in the filter plate. A membrane cartridge, wherein a permeated liquid outlet disposed at an edge protrudes outward from a notch formed at an upper end of a membrane case. 2. A permeate liquid, wherein an upper joint between the filter plate and the filter membrane at the upper end side of the filter plate is formed with an upward slope toward one upper edge of the filter plate, and the permeate is disposed on one upper edge of the filter plate. 2. The membrane cartridge according to claim 1, wherein the outlet is provided near the upper joint, and the uppermost part of the water collecting hole is formed at a position close to the permeate outlet.