JP2001205053A - Method for filtration by hollow fiber membrane module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for filtration by a hollow fiber membrane module in which the cleaning of membrane surfaces is easy and which is particularly suitable for filtering a liquid of high turbidity due to organic substances. SOLUTION: In the filtration method, the hollow fiber membrane module in which one end part or both end parts of the hollow fiber membrane formed in the shape of a sheet are fixed by a fixing member in a housing while the hollow fiber membrane is opened is used, and the module is arranged so that the longitudinal direction of the hollow fiber membrane of the module is perpendicular.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration method using a hollow fiber membrane module, and in particular, to a filtration method using a hollow fiber membrane module suitable for filtering a highly polluting liquid (contamination by an organic substance). provide.

[0002]

2. Description of the Related Art Conventionally, a filtration method using a hollow fiber membrane module has been widely used in the field of so-called microfiltration such as production of sterile water, drinking water or high-purity water, and purification of air. Secondary and tertiary treatment at sewage treatment plants,
Various studies have been made on application to treatment of highly polluting water such as solid-liquid separation in a septic tank.

[0003] The hollow fiber membrane module used in such an application has a large clogging of the hollow fiber membrane during the filtration treatment.
After filtration for a certain period of time, air must be sent to vibrate the hollow fiber membrane to wash the membrane surface, or membrane surface cleaning such as passing treated water in the opposite direction to the filtration process must be repeated. .

The hollow fiber membrane module used in these fields is a cylindrical type in which hollow fiber membranes which are used in the field of conventional microfiltration are arranged in a circular or concentric manner. Almost. Even if improvements are made, there are many that only change the filling rate or filling form of the hollow fiber membrane.

[0005]

SUMMARY OF THE INVENTION Using the conventional hollow fiber membrane module as described above, highly polluting water (for example, ss ≧
When a filtration treatment of 50 mg / L, TOC ≧ 100 mg / L) is performed, organic substances and the like adhere to and accumulate on the surface of the hollow fiber membrane with the progress of use of the hollow fiber membrane module. The films are fixed (adhered) and integrated. As a result, the effective membrane area of the hollow fiber membrane in the hollow fiber membrane module decreases, and the filtration flow rate sharply decreases. Further, even if the membrane surface cleaning and backwashing of the hollow fiber membranes are performed regularly, the hollow fiber membranes adhere to each other as described above,
If they are integrated, it is not easy to recover the function of the module, and the cleaning efficiency is reduced.

As a solution to this problem, a hollow fiber membrane is arranged in a sheet form in place of a bundled cylindrical hollow fiber membrane module, and one end or both ends of the hollow fiber membrane forming a sheet are It consists of a hollow fiber membrane module which is fixed while maintaining the open state of each hollow fiber membrane by a fixing member in one or two different housings, and the shape of the cross section perpendicular to the hollow fiber membrane of the fixing member is Also, a hollow fiber membrane module which is elongated and has a substantially rectangular shape has been proposed.

The flat hollow fiber membrane module in which the sheet-like hollow fiber membranes are arranged can arrange the sheet-like hollow fiber membranes at intervals and evenly arrange them in the inner and outer layers. When washing the membrane surface, it is extremely easy to evenly wash the surface of the hollow fiber membrane, which can suppress a decrease in filtration efficiency, and thus is suitable for filtration of highly polluted water.

When treating a large volume (for example, 1 m ³ / h) of water using a flat hollow fiber membrane module in which the hollow fiber membranes are arranged in a sheet form, it is necessary to increase the membrane area. However, when the membrane area of the hollow fiber membrane module is increased, handling of the hollow fiber membrane module becomes difficult,
Further, since the treatment tank becomes unnecessarily large and the hollow fiber membranes are accumulated, there is a problem that when performing scrubbing cleaning or the like, the entire membrane surface in the module cannot be efficiently cleaned with air or the like. .

As a conventional method of using a flat hollow fiber membrane module in which hollow fiber membranes are arranged in a sheet shape, there is a method of increasing the number of modules to increase the membrane area and unitizing the modules. Since the module arrangement in the unit (that is, the interval between the modules when the sheet-like hollow fiber membranes are arranged in parallel so as to overlap each other) is governed by the diameter of the water collecting pipe of each module,
There is also a problem that there is a limit in reducing the distance between modules.

[0010] Accordingly, the module interval (the interval between the hollow fiber membrane knitted fabrics in the case of the sheet-shaped flat hollow fiber membrane module) is increased more than necessary, and the volume of the treatment tank becomes unnecessarily large accordingly. Alternatively, there is a problem that the amount of bubbling for scrubbing must be increased.

Accordingly, an object of the present invention is to provide a compact structure by occupying a small space in the water collecting portion even if the membrane area of the hollow fiber membrane is increased. It is an object of the present invention to provide a filtration method using a hollow fiber membrane module, which can efficiently perform scrubbing cleaning.

[0012]

The above object can be achieved by a filtration method using a hollow fiber membrane module of the present invention having the following configuration.

That is, in the filtration method using the hollow fiber membrane module of the present invention, one end or both ends of the sheet-like hollow fiber membrane are fixed by a fixing member in the housing while maintaining the open state of the hollow fiber membrane. And a filtration method using a hollow fiber membrane module which is arranged so that the length direction of the hollow fiber membrane of the hollow fiber membrane module is vertical.

In the filtration method using the hollow fiber membrane module according to the present invention having the above-described structure, the hollow fiber in which a plurality of sheet-like hollow fiber membranes are arranged and the fixing member is fixed to the water collecting pipe. Preferably, a membrane module is used.

Further, in the filtration method using the hollow fiber membrane module of the present invention having the above-mentioned structure, the hollow fiber membrane module in which a plurality of sheet-shaped hollow fiber membranes are arranged so as to overlap with each other at intervals. It is preferable to use 5 to 10 hollow fiber membranes in the form of a plurality of sheets.
It is even more preferable to use hollow fiber membrane modules that are arranged one above the other at intervals of 0 mm.

Further, in the filtration method using the hollow fiber membrane module of the present invention having the above-mentioned structure, it is preferable to use a hollow fiber membrane module fixedly integrated with a diffuser tube.

Further, in the filtration method using the hollow fiber membrane module of the present invention having the above configuration, it is preferable that the filtration operation is performed intermittently.

Further, in the filtration method using the hollow fiber membrane module of the present invention having the above-described structure, it is preferable to perform the filtration operation while performing scrubbing cleaning by air bubbling.

Hereinafter, a specific configuration of the filtration method using the hollow fiber membrane module of the present invention will be described with reference to the drawings.

FIG. 1 shows an example in which eight hollow fiber membranes made of a hollow fiber membrane knitted fabric are used, and one end of each hollow fiber membrane is formed as follows.
The hollow fiber membrane module comprises a hollow fiber membrane module fixed by a fixing member while maintaining the open state of the hollow fiber membrane, and the hollow fiber membrane module is arranged so that the length direction of the hollow fiber membrane is vertical. It is a perspective view of a thread membrane module.

In this hollow fiber membrane module, the cross section perpendicular to the hollow fiber membrane of the fixing member is elongated and substantially rectangular, and the area of the fixing member surface on the side where the hollow fiber membrane is exposed from the fixing member is A, When the area of the end surface of the fixing member where the hollow fiber membrane is open is B, the relationship of 100 ≧ A / B ≧ 1.2 is satisfied. In the hollow fiber membrane module shown in FIG.
A / B is set to 1.7.

FIG. 2 shows a state in which both ends of each hollow fiber membrane are opened by using eight sheet-shaped hollow fiber membranes made of a knitted hollow fiber membrane as in FIG. FIG. 3 is a perspective view of a hollow fiber membrane module which is formed of a hollow fiber membrane module fixed by a fixing member while being kept, and which is arranged so that the length direction of the hollow fiber membrane of the hollow fiber membrane module is vertical. .

FIG. 3 is a cross-sectional view of the hollow fiber fixing portion of the hollow fiber membrane module shown in FIGS. 1 and 2 in a direction perpendicular to the longitudinal direction of the water collecting pipe.

1 to 3, reference numeral 3 denotes an opening end face of the hollow fiber membrane, 5 denotes a hollow fiber membrane formed of a hollow fiber membrane knitted fabric, 6 denotes a housing and a water collecting pipe, 7 denotes a fixing member,
Reference numeral 8 denotes a water pipe, and 9 denotes a filtrate outlet.

As shown in FIGS. 1 and 2, one end or both ends of a sheet-shaped hollow fiber membrane made of a hollow fiber membrane knitted fabric are kept in the structural material while maintaining the open state of the hollow fiber membrane. In the hollow fiber membrane module which is fixed by the fixing member of the fixing member, and whose cross section perpendicular to the hollow fiber membrane of the fixing member is elongated and substantially rectangular, the area of the fixing member surface on the side where the hollow fiber membrane is exposed from the fixing member is A, When the area of the end face of the fixing member where the hollow fiber membrane is open is B, a hollow fiber membrane module that satisfies 100 ≧ A / B ≧ 1.2 increases the membrane area of the hollow fiber membrane. However, the structure that can reduce the space occupied by the water collecting portion can be obtained, whereby a hollow fiber membrane module having a compact structure can be obtained.

As the hollow fiber membrane knitted fabric 5 as a sheet-like hollow fiber membrane, for example, those made of various materials such as cellulose, polyolefin, polyvinyl alcohol, and polysulfone can be used. Particularly, a material made of a material having a high elongation such as polyethylene or polypropylene is preferable.

The hollow fiber membrane is not particularly limited as long as it can be used as a filtration membrane, and there are no particular restrictions on the pore size, porosity, film thickness, outer diameter, etc. From the viewpoints of securing the strength and strength of the hollow fiber membrane, etc.
m, porosity 20 to 90%, film thickness 5 to 300 μm, outer diameter 2
0-2000 μm is preferred.

In particular, for the purpose of removing bacteria, the pore size must be 0.2 μm or less. For the purpose of removing organic substances and viruses, the molecular weight cutoff is in the range of tens of thousands to tens of thousands. It may be an ultrafiltration membrane.

As the surface characteristics of the hollow fiber membrane, a so-called permanent hydrophilized membrane having a hydrophilic group or the like on the surface is desirable.
As a method for producing the permanent hydrophilic membrane, a known method such as a method of producing a hollow fiber membrane with a hydrophilic polymer such as a polyvinyl alcohol type, or a method of hydrophilizing the surface of a hydrophobic polymer membrane can be used. For example, examples of the hydrophilic polymer when the hydrophilic polymer is hydrophilized by applying the hydrophilic polymer to the membrane surface of the hydrophobic hollow fiber membrane include a saponified ethylene-vinyl acetate copolymer, polyvinylpyrrolidone, and the like. be able to.

Examples of membrane surface hydrophilization by another method include:
There is a film surface polymerization method of a hydrophilic monomer, and examples of this monomer include diacetone acrylamide.

As another method, a hydrophilic polymer is blended with a hydrophobic polymer (eg, polyolefin),
This can be a method of spinning and forming a film, and examples of the hydrophilic polymer to be used include those described above.

When the surface of the hollow fiber membrane is hydrophobic, hydrophobic interaction acts between organic matter in the water to be treated and the surface of the hollow fiber membrane, and organic substances are adsorbed on the membrane surface. Blockage, and the filtration life is shortened. In addition, it is generally difficult to recover filtration performance by cleaning the membrane surface due to clogging caused by adsorption.

On the other hand, when the permanent hydrophilizing membrane is used, the hydrophobic interaction between the organic substance and the surface of the hollow fiber membrane can be reduced, and the adsorption of the organic substance can be suppressed. Furthermore,
In the scrubbing cleaning during use in the hydrophobic membrane, the bubbling air causes drying and hydrophobicity, which may cause a decrease in the flux. However, the permanent hydrophilized membrane does not cause a decrease in the flux even when dried. .

As shown in FIGS. 1 and 2, the hollow fiber membrane may be fixed at one end or both ends of the sheet-shaped hollow fiber membrane, and either fixing means may be used depending on the purpose and application. You can choose.

In the filtration method using the hollow fiber membrane module of the present invention, a hollow fiber membrane module utilizing a sheet-shaped hollow fiber membrane is provided, and the length of the hollow fiber membrane of the hollow fiber membrane module in the longitudinal direction is reduced. Use a hollow fiber membrane module which is arranged so as to be vertical. By using the hollow fiber membrane module that is arranged so that the length direction of the hollow fiber membrane is vertical, the air bubbles used for scrubbing cleaning can move along the membrane surface without receiving large resistance from the membrane surface. As a result, the air bubble rises at a higher speed, thereby increasing the cleaning efficiency.

On the other hand, when the hollow fiber membrane module is arranged so that the length direction of the hollow fiber membrane of the hollow fiber membrane module is horizontal or oblique, the air bubble used for scrubbing and cleaning is used. When rises,
Since the air bubbles successively collide with the surface of the hollow fiber membrane, the rising speed of the air bubbles becomes slow, and as a result, the cleaning efficiency is deteriorated.

Further, when performing filtration of, for example, sewage drainage, which contains fibrous contaminants such as hair and washing waste in the water to be treated, the length direction of the hollow fiber membrane is arranged in a horizontal direction or an oblique direction. In such a case, these fibrous contaminants are easily entangled with the hollow fiber membrane, and the entangled portion is difficult to be scrubbed and washed, so that the membrane surface of the hollow fiber membrane is easily blocked.

On the other hand, when the hollow fiber membrane module is arranged so that the length direction of the hollow fiber membrane is vertical as described above, the fibrous contaminants are removed by the hollow fiber membrane. And it becomes difficult for the membrane surface of the hollow fiber membrane to be clogged.

The hollow fiber membrane knitted fabric 5 as a sheet-shaped hollow fiber membrane is formed by knitting a hollow fiber membrane into a sheet.
This sheet-shaped hollow fiber membrane is, for example,
It can be easily manufactured by using the apparatus and method described in JP-A-886-86 and JP-A-63-91673.

In FIG. 3, a hollow fiber membrane open end face 3 is a portion for taking out a filtrate from this end face and sending the filtrate to a water pipe or the like. In the hollow fiber membrane module shown in FIGS. 1 and 2, the housing and the water collecting pipe 6 function as an entire support member and have an elongated, substantially rectangular opening. The opening of the housing and the water collecting pipe 6 has a cross section perpendicular to the hollow fiber membrane of the fixing member which is filled and fixed with the hollow fiber membrane therein, and has an elongated substantially rectangular shape.

The fixing member 7 is filled and fixed in the opening of the housing and the water collecting pipe 6, and is formed so as to have a shape as shown in FIG. 2, but any shape may be used. No problem. The fixing member 7 converges and fixes each end of a large number of hollow fiber membranes while maintaining the open state, and also converts the water to be treated and the treated water into liquid so that the hollow fiber membranes function as a filtration membrane. It functions as a dense partitioning member.

The fixing member 7 is usually formed by curing a liquid resin such as an epoxy resin, an unsaturated polyester resin, and polyurethane. The water conduit 8 is a pipe through which the filtrate flows, and communicates with the filtrate outlet 9.

The material of the housing, the water collecting pipe 6 and the water guiding pipe 8 may be any material having mechanical strength and durability. For example, hard polyvinyl chloride resin, polycarbonate, polysulfone, polypropylene, acrylic resin, ABS resin And modified PPE resin. If incineration is required after use, it is preferable to use a hydrocarbon-based resin material that can be completely burned without emitting toxic gas by combustion.

The ratio A / B between the area A of the fixing member surface on the side where the hollow fiber membrane is exposed from the fixing member and the area B of the fixing member end face where the hollow fiber membrane is open, and A / B can be selected arbitrarily. But,
In consideration of the processing capacity, the membrane area, the size of the can or the processing tank, the handleability, the number of sheet-like hollow fiber membranes, the inner diameter and the outer diameter of the water collecting pipe, the range of 1.2 to 100 is preferable.

The filtration method using the hollow fiber membrane module of the present invention has the following features. That is, since the hollow fiber membranes are evenly arranged on the entire surface of the fixing member represented by the area A, the area B is the same, and the A / B is 1 between the hollow fiber membranes. This makes it difficult for the accumulation of turbidity and adhesion between the hollow fiber membranes to occur, so that the membrane surface can be effectively used and scrubbing and cleaning can be performed efficiently.

Even if the number of hollow fiber membrane modules is the same, the hollow fiber membrane module of A / B> 1 has a smaller amount of resin used as a fixing member than A / B = 1. Can be made. Therefore, in the case of a resin which generates heat during curing, the smaller the amount of the resin, the less heat is generated, the smaller the curing shrinkage and the easier the molding.

A hollow fiber membrane module using a sheet-like hollow fiber membrane made of a hollow fiber membrane knitted fabric as shown in FIGS. 1 and 2, that is, using a sheet-like hollow fiber membrane, and setting the A / B value. When the hollow fiber membrane module is set in the range of 1.2 to 100, handleability is superior to that of a hollow fiber membrane module having a similar membrane area.

Further, since the hollow fiber membranes in the form of sheets made of a knitted fabric of hollow fiber membranes can be evenly arranged inside and outside at intervals, the surface of the hollow fiber membranes is evenly washed when the membrane surface is washed. It becomes extremely easy to do. Furthermore, the effect can be further improved by arranging the intervals between the sheet-like hollow fiber membranes made of the respective hollow fiber membrane knitted fabrics at equal intervals.

When a plurality of hollow fiber membrane modules are arranged in a treatment tank or the like to form a hollow fiber membrane module unit, in particular, a sheet-like hollow fiber membrane made of a knitted hollow fiber membrane is arranged side by side so as to overlap. When all the sheet-like hollow fiber membranes in all the hollow fiber membrane modules are fixed at equal intervals, it becomes possible to perform even scrubbing and cleaning on the entire hollow fiber membrane, and to reduce the partial filtration efficiency. No more inviting.

When the depth of the processing tank has a margin with respect to the height of the hollow fiber membrane module, a plurality of hollow fiber membrane modules are stacked and arranged in the depth direction of the processing tank. It is also possible to use a hollow fiber membrane module unit.

Further, it is also possible to use a plurality of the above-mentioned hollow fiber membrane module units in which a plurality of hollow fiber membrane modules are juxtaposed in the horizontal direction, in the depth direction of the processing tank. When the processing tank can be deepened, if the hollow fiber membrane module units are stacked and used in the depth direction, the installation area of the processing tank can be reduced as compared with the case where a shallow processing tank is used. Since the air used for scrubbing can be concentrated on a limited area, the cleaning efficiency can be further improved.

In the hollow fiber membrane module, the intervals between the sheet-like hollow fiber membranes made of the hollow fiber membrane knitted fabric are made equal intervals in consideration of uniformly applying air bubbling during scrubbing to the entire membrane surface. Desirably, the interval can be set arbitrarily, but in consideration of the efficiency of scrubbing cleaning in air bubbling and the like, the prevention of adhesion between adjacent hollow fiber membrane knitted fabrics, and the membrane area per module, etc. Preferably, it is 5 to 100 mm.

That is, if the interval between the sheet-like hollow fiber membranes made of a knitted hollow fiber membrane is smaller than 5 mm, the hollow fiber membranes become too dense and the washing property deteriorates.
When the ratio exceeds, the decrease in the membrane area per volume occupied by the filtration device becomes remarkable.

A flat-type hollow fiber membrane module using a sheet-like hollow fiber membrane made of a hollow fiber membrane knitted fabric is provided in a closed container, and the hollow fiber membrane is formed by pressurizing water to be treated. A so-called pressure filtration method can be adopted, in which a hollow fiber membrane module is disposed in an activated sludge tank or a sedimentation tank, and the suction filtration method of suctioning the side for collecting the treated water that has passed through the hollow fiber membrane is used. Is more preferred.

In particular, by employing a filtration method using a so-called intermittent suction operation method in which temporary suction is periodically stopped,
The deposit on the membrane surface can be efficiently prevented from entering the inside of the membrane surface, and the frequency of processing for recovering the function of the hollow fiber membrane module can be reduced.

The intermittent interval at the time of performing the intermittent suction is different from the optimum range depending on the turbidity of the water to be treated.
Although a clear range cannot be specified, MLSS 5000 mg /
When targeting activated sludge of about L, suction time 1 ~
A range of 30 minutes and a stop time of 2 seconds to 15 minutes is preferable.

Further, by employing the suction filtration method,
At the time of filtration, it becomes easy to circulate the treated water in the tank or perform air bubbling to wash the membrane surface. In particular, as described above, the cleaning method by air bubbling can further improve the cleaning effect by combining with the intermittent suction operation method that can efficiently prevent the film surface deposit from entering the inside of the film surface. . That is,
In the intermittent suction operation method, when the filtration operation is stopped, the force for pulling ss to the membrane surface does not work, so that the effect of peeling ss from the membrane surface by air bubbling becomes higher. In the suction filtration method, it is preferable to improve the effect of washing the surface of the hollow fiber membrane by making the flow of the water to be treated substantially parallel to the length direction of the hollow fiber membrane.

In filtration of highly polluted water, many s
s and organic matter are deposited. For that purpose, it is necessary to remove the deposit using a water flow, air, vibration, ultrasonic waves, or the like, and to clean the film surface. If the cleaning is not performed, organic substances deposited on the membrane surface will cause blockage of the membrane, resulting in a reduction in filtration life.

Specific cleaning methods include a so-called cross-flow filtration in which a water flow is made parallel to the membrane surface, a method in which a water flow is caused in a membrane module immersion tank by a pump or a motor, a bubbling method using an ascending air flow, a module. A method of vibrating the liquid itself, a method of vibrating the liquid to be treated by ultrasonic waves, and the like can be given. Above all, the bubbling method using the rise of air can reduce the running cost, for example, when performing activated sludge treatment, by also serving as air used for BOD treatment and air used for cleaning. Therefore, it is preferable.

The washing may be performed continuously or intermittently depending on the progress of the blockage of the membrane surface of the hollow fiber membrane. It is more efficient because it can be operated with a higher filtration speed.

In the case of operating while performing scrubbing cleaning by air bubbling, an air diffuser for performing bubbling is required. For proper air bubbling, the positional relationship between the air diffuser and the module is important, but fixing the module and the air diffuser separately is a complicated operation, and the module may move during operation. In such a case, there is a problem that appropriate scrubbing cleaning cannot be performed during operation.

As a countermeasure, a hollow fiber membrane module fixed to and integrated with the air diffuser makes it easy to mount on the can body or the treatment layer, so that appropriate scrubbing and cleaning during operation can be continued. Become like

The filtration method using the hollow fiber membrane module of the present invention is particularly suitable for filtration of highly polluted water. Specific application fields include filtration of river water, filtration of industrial tap water, and solid-liquid separation of sewage. Separation, wastewater treatment (for example, treatment in a combined septic tank)
And the like.

[0064]

According to the filtration method using the hollow fiber membrane module of the present invention, the hollow fiber membrane has a large membrane area and a compact structure, and more hollow fiber membranes are in direct contact with the water to be treated. A module, which uses a hollow fiber membrane module that is arranged so that the length direction of the hollow fiber membranes is the vertical direction, and adhesion and integration between the hollow fiber membranes are effectively prevented, In particular, even when filtering highly polluted water, high filtration efficiency can be maintained for a long period of time.

The filtration method using the hollow fiber membrane module of the present invention is performed by using a hollow fiber membrane module in which sheet-like hollow fiber membranes made of a knitted hollow fiber membrane are arranged at equal intervals. By applying this filtration method to a method in which a hollow fiber membrane module is immersed in a treatment tank, a uniform and efficient scrubbing cleaning is performed over a plurality of hollow fiber membrane modules. can do.

Further, the hollow fiber membrane module used in the filtration method using the hollow fiber membrane module of the present invention can be easily attached to and detached from a can or a treatment tank, and is excellent in handleability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a hollow fiber membrane module.

FIG. 2 is a perspective view showing another example of the hollow fiber membrane module.

FIG. 3 is a sectional view of a hollow fiber membrane fixing portion in the hollow fiber membrane module of FIGS. 1 and 2;

[Explanation of symbols]

 3 Open end face of hollow fiber membrane 5 Hollow fiber membrane in sheet form made of hollow fiber membrane knitted fabric 6 Housing and water collecting pipe 7 Fixing member 8 Water guiding pipe 9 Filtrate outlet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoya Tanakamaru 6-41 Konan, Minato-ku, Tokyo Inside Mitsubishi Rayon Co., Ltd. (72) Inventor Masumi Kobayashi 4--60 No. Mitsubishi Rayon Co., Ltd. (72) Inventor Tatsuharu Okada 1-6-1 Konan, Minato-ku, Tokyo Mitsubishi Rayon Engineering Co., Ltd.

Claims (7)

[Claims] 1. A hollow fiber membrane module in which one end or both ends of a sheet-like hollow fiber membrane is fixed by a fixing member in a housing while maintaining an open state of the hollow fiber membrane. A method for filtering with a hollow fiber membrane module, comprising using a hollow fiber membrane module arranged so that the length direction of the hollow fiber membrane of the hollow fiber membrane module is vertical. 2. A hollow fiber membrane module in which a plurality of sheet-like hollow fiber membranes are arranged and a fixing member is fixed to a water collecting pipe.
3. A filtration method using the hollow fiber membrane module according to 1.). 3. The hollow fiber membrane module according to claim 1, wherein a plurality of sheet-shaped hollow fiber membranes are used, and the hollow fiber membrane modules are arranged so as to overlap with each other at intervals. Filtration method using a hollow fiber membrane module. 4. The sheet-like hollow fiber membrane has 5 to 10 hollow fibers.
The method for filtering with a hollow fiber membrane module according to claim 3, wherein hollow fiber membrane modules arranged at an interval of 0 mm are used. 5. The method for filtering with a hollow fiber membrane module according to claim 1, wherein a hollow fiber membrane module fixed to and integrated with an air diffuser is used. 6. The filtration method using a hollow fiber membrane module according to claim 1, wherein the filtration operation is performed intermittently. 7. The filtration method using a hollow fiber membrane module according to any one of claims 1 to 6, wherein the filtration operation is performed while performing scrubbing cleaning by air bubbling.