JP2005230813A - Hollow fiber membrane module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module which prevents suspended substances from sticking by moderately swinging the hollow fiber of the hollow fiber membrane module at the time of filtration and air scrubbing, facilitates the removal of the peeled suspended substances, prevents the hollow fiber end from damaging the other hollow fiber, and facilitates a closing operation of a large number of hollow fiber ends. <P>SOLUTION: This is a hollow fiber membrane module, in which a large number of hollow fiber membranes are stored in a cylindrical case, and is so constituted that one end part of the hollow fiber membrane is fixed to the cylindrical case in a state of the end face opened, the other end part of the hollow fiber membrane is divided in a plurality of small bundles and the end faces are closed in bulk at the unit of bundles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hollow fiber membrane module suitably used for water treatment applications and the like, and particularly relates to a hollow fiber membrane module that is less likely to cause a decrease in filtration performance and has a shape suitable for improving production efficiency.

  BACKGROUND ART Conventionally, hollow fiber membrane modules for clean water have been widely used for clean water, industrial water, and the like, and are known for many embodiments and various uses.

  Conventionally used hollow fiber membrane modules are also disclosed in, for example, Patent Documents 1 to 4, and a plurality of hollow fiber membranes 2 are accommodated in a cylindrical case 3 as shown in FIGS. It is configured. As shown in Patent Document 1, in the hollow fiber membrane module shown in FIG. 7, one end portion (upper end portion) of the hollow fiber membrane 2 is attached to the cylindrical case 3 with the synthetic polymer resin 4 in an open state. On the other hand, the other end portion (lower end portion) of the hollow fiber membrane 2 is fixed to the cylindrical case 3 with the synthetic polymer resin 4 in a state where the end face is closed. Further, as shown in Patent Documents 2 to 4, in the hollow fiber membrane module shown in FIG. 8, one end portion (upper end portion) of the hollow fiber membrane 2 is synthesized with the cylindrical case 3 with the end face opened. The other end portion (lower end portion) of the hollow fiber membrane 2 is fixed to the polymer resin 4 and is not fixed to the cylindrical case 3, and the end surface of each hollow fiber membrane is kept closed so that it can freely move. It has become.

  When these hollow fiber membrane modules are used in an external pressure system, they are usually arranged vertically, and raw water (treated water) is introduced from the inlet 12 below the cylindrical case, passes through the hollow fiber membrane and reaches the hollow part. The filtered water is taken out from the upper cap 6 at the top.

  At this time, when the filtration proceeds, suspended substances in the raw water adhere to the outer surface of the hollow fiber membrane, the filtration resistance increases, and the membrane permeation flow rate (FLUX) gradually decreases. Therefore, in order to restore the filtration resistance to the original low state, the supply of raw water is stopped, so-called backwashing is performed in which a predetermined amount of filtered water is supplied from the upper cap 6 side, and air is supplied from the inlet 12 provided at the lower part. The air is scrubbed by blowing off the suspended matter, and the suspended substance is allowed to fall off and discharged from the lower cap 7 together with the water in the cylindrical case.

  Further, in the immersion type hollow fiber membrane module using the negative pressure system as shown in Patent Document 5, as shown in FIG. 11, a large number of hollow fiber membranes 2 are provided in the cylindrical case 17 having a water-permeable opening. The raw water is passed through the opening of the cylindrical case, and the filtrate filtered negative pressure from the outside of the hollow fiber membrane to the hollow portion is taken out from the upper cap 6 to the outside. In the submerged hollow fiber membrane module, when the filtration proceeds as in the pressurization method, suspended substances in the raw water adhere to the outer surface of the hollow fiber membrane, the filtration resistance increases, and the membrane permeation flow rate (FLUX) gradually increases. descend. Therefore, in order to restore the filtration resistance to the original low state, air is scrubbed by blowing air from the inflow port 12 provided at the lower part, and suspended substances are dropped off from the inlet 10 or the opening of the cylindrical case to the outside. To discharge.

  However, in the case of the hollow fiber membrane module as shown in FIG. 7 or FIG. 11, the air introduced from the inlet 12 when the hollow fiber membrane is physically washed is a plurality of air provided in the lower synthetic polymer resin 4. Although it will flow into the filtration region from the air diffuser 10, the hollow fiber membrane is not easily shaken because both ends of the hollow fiber membrane are gripped by the resin, and the hollow fiber membrane in the vicinity of the synthetic polymer resin 4 is sufficiently removed. It is difficult to clean. Furthermore, the suspended substance peeled off from the outer surface of the hollow fiber membrane is originally discharged together with water from the air diffuser 10 or the opening of the cylindrical case in the case of an immersion module. The suspended suspended matter is likely to stay in that part, and is difficult to remove completely.

On the other hand, the hollow fiber membrane module as shown in FIG. 8 is effective for preventing the attachment of suspended solids because the lower hollow fiber ends freely sway individually due to the inflow of raw water or air scrubbing in the filtration process. The operation of closing one end of each hollow fiber membrane one by one is cumbersome and time consuming, and the flow rate of the raw water in the cylindrical case tends to be biased. There is a risk of colliding with other hollow fiber membranes and damaging the hollow fiber membranes. In addition, the air flow tends to be biased even during air scrubbing, and there is another problem that the suspension material is biased to be washed, and the hollow fiber membranes that swing freely are entangled with each other.
Japanese Patent No. 3290815 Japanese Patent Laid-Open No. 7-60074 JP 59-4403 Japanese Utility Model Publication No. 60-115502 and specification JP 2002-346344 A

  The present invention is suitable for swaying the hollow fiber membrane during the filtration process or air scrubbing without damaging the air, and during air scrubbing, the suspended material peeled off from the outer surface of the hollow fiber membrane can be easily discharged. An object of the present invention is to provide a hollow fiber membrane module that is easy to handle.

  In order to achieve the above object, the present invention has the following configuration.

  (1) A hollow fiber membrane module in which a large number of hollow fiber membranes are housed in a cylindrical case, and one end of the hollow fiber membrane is fixed to the cylindrical case with the end face open, A hollow fiber membrane module, wherein the other end of the yarn membrane is divided into a plurality of small bundles, and the end surfaces are closed together in units of the small bundles.

  (2) The hollow fiber membrane module according to (1), wherein an end surface of the other end of the hollow fiber membrane is closed with a closing member made of resin or a composite of resin and metal.

  (3) The hollow fiber membrane module according to (1) or (2), wherein the closing member has a columnar shape, a spherical shape, or a streamline shape.

  (4) The hollow fiber membrane module according to any one of (1) to (3), wherein the blocking member has a turbulent flow generation portion on a surface thereof.

  (5) In any one of the above (1) to (4), a partition member that partitions the small bundle unit is provided at a position corresponding to the other end of the hollow fiber membrane in the cylindrical case. Hollow fiber membrane module.

  (6) The hollow fiber membrane module according to any one of (1) to (5) above, wherein the cylindrical case is an open system through which water can flow.

  According to the first aspect of the present invention, the hollow fiber membrane is divided into a plurality of small bundles at the end portion that will be positioned on the lower side during use, and the end surfaces thereof are closed together for each small bundle unit. Therefore, during the filtration process or air scrubbing, it can move freely (shake) in small bundle units, and can prevent the suspended material from adhering or efficiently remove the suspended material. And also about the backwash drainage, since a flow path can be taken comparatively large, drainage can be completed for a short time. Moreover, since the end surface blocking member in the small bundle unit becomes a weight, the position of each small bundle is generally maintained even if raw water or air is introduced. As a result, the hollow fiber membrane will not be damaged and entangled more than necessary. Furthermore, since the hollow fiber membrane end portion that will be positioned on the lower side during use is not fixed to the cylindrical case, the suspended substance peeled off from the outer surface of the hollow fiber membrane is easily discharged during air scrubbing, Since the end face may be closed together for each small bundle unit, the work of closing the end face of the hollow fiber membrane is easy and productivity can be improved.

  According to the second aspect of the invention, since the end face of the small bundle can be closed with the resin, it is an efficient closing operation. Further, when the resin is poured into a metal container and solidified at that time, a more efficient closing operation can be performed, and a module in which the weight effect is increased by the metal can be obtained.

  According to the third aspect of the present invention, the flow of raw water or air tends to be smooth and uniform, and the small bundle can be effectively shaken without being biased.

  According to the fourth aspect of the present invention, minute vibrations and vibrations can be imparted to the small bundle of hollow fibers by collision of raw water or air with a turbulent flow generating portion provided on the surface of the closing member.

  According to the fifth aspect of the present invention, since the position of each small bundle during the filtration step or air scrubbing can be more restricted, it is possible to further prevent the raw water or air flow from being biased.

  According to the sixth aspect of the present invention, the same effect can be obtained even in an immersion type hollow fiber membrane module that is used in a negative pressure system and is an open system through which a cylindrical case can pass water.

  The hollow fiber membrane module according to the present invention will be described below by taking a hollow fiber membrane module used for water filtration as an example. In addition, this invention is not limited to the hollow fiber membrane module for clean water, It can apply also to hollow fiber membrane modules, such as for industrial water and a sewage.

  First, the structure of the hollow fiber membrane module of this invention is demonstrated, referring a figure. FIG. 1 is a schematic longitudinal sectional view of a hollow fiber membrane module, FIG. 2 is a partially enlarged view showing an end surface of a small bundle unit obtained by dividing the hollow fiber membrane into a plurality of small bundles and closed with a closing member, and FIG. It is a schematic longitudinal cross-sectional view of a thread membrane module.

  As shown in FIG. 1, the hollow fiber membrane module 1 houses a large number of hollow fiber membranes 2 in a cylindrical case 3 having both ends opened, and the upper end of the hollow fiber membrane 2 is in an open state at the end surface. However, the upper end of the cylindrical case 3 is liquid-tightly fixed with the synthetic polymer resin 4. On the other hand, the lower end of the hollow fiber membrane 2 is divided into 10 to 800 bundles of small bundles 2a, and the end surfaces are collectively closed by the closing member 5 in small bundle units. At the lower end, the hollow fiber membrane 2 is in a state of being freely movable in units of small bundles 2a, and if it is in a state of being freely movable in units of small bundles, the curved portion of the yarn bundle that is bent into a U shape. May be put together by the closing member 5.

  An upper cap 6 having a filtrate outlet 13 is sandwiched between the upper part of the cylindrical case 3 and a diffuser plate 9 is sandwiched between the lower part of the cylindrical case 3 and a lower cap 7 having an inlet 12 for stock solution and air is liquid-tight. Connected. In addition, although it does not specifically limit as a means to make liquid-tight, what is necessary is just to attach with a sanitary clamp etc. pinching packing.

  The inlet 12 of the lower cap 7 has a raw water introduction pump (not shown) connected to the raw water introduction path, an air introduction valve (not shown) connected to an air source, and a first drain valve (not shown) connected to the drainage path. (Not shown) is connected. A filtrate valve (not shown) connected to the filtrate outlet path is connected to the filtrate outlet 13 of the upper cap 6. Further, an air outlet 14 for air scrubbing is provided above the cylindrical case 3 and a second drain valve connected to the drainage channel is connected thereto.

  In the case of the submerged hollow fiber membrane module, an upper cap 6 having a filtrate outlet 13 is provided at the upper part of the cylindrical case which is an open system through which raw water can pass as shown in FIG. A diffuser plate 9 is sandwiched between the lower cap 7 having an air inlet 12 and connected in a liquid-tight manner. An air introduction valve (not shown) connected to an air source and a first drain valve (not shown) connected to a drainage channel are connected to the inlet 12 of the lower cap 7. A suction pump (not shown) and a filtrate valve (not shown) connected to the filtrate outlet path are connected to the filtrate outlet 13 of the upper cap 6.

  Examples of the material of the cylindrical cases 3 and 17 include polyolefins such as polyethylene, polypropylene, and polybutene, polytetrafluoroethylene (PTFE), tetrafluoroethylene perfluoroalkoxyethylene copolymer (PFA), and tetrafluoroethylene 6 fluorine. Fluorine Resins such as Propylene Propylene Copolymer (FEP), Tetrafluoroethylene Ethylene Copolymer (ETFE), Trifluoroethylene Resin (PCTFE), Ethylene Chlorotrifluoroethylene (ECTFE), Polyvinylidene Fluoride (PVDF) Chlorinated resins such as polyvinyl chloride and polyvinylidene chloride, polysulfone resin, polyether sulfone resin, polyallyl sulfone resin, polyphenyl ether resin, acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylonite Le - styrene copolymer resin, polyphenylene sulfide resin, polyamide resin, polycarbonate resin, polyether ketone resin, polyether ether ketone resin is used alone or in a mixture. Other than the resin, aluminum, stainless steel, and the like are preferable, and a composite material such as a resin-metal composite, a glass fiber reinforced resin, and a carbon fiber reinforced resin may be used. In the case of the immersion type hollow fiber membrane module shown in FIG. 12, the cylindrical case 17 may have a net-like or lattice-like structure in which the hollow fiber membrane is substantially exposed.

  The material of the hollow fiber membrane 2 is not particularly limited, and polysulfone, polyethersulfone, polyacrylonitrile, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, ethylene-vinyl alcohol copolymer, Examples thereof include cellulose, cellulose acetate, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, and the like, and these may be combined.

  The small bundle 2a may be composed of a plurality of hollow fiber membranes so as to obtain the intended effect according to the diameter and length of the cylindrical cases 3 and 17 and the structure of the inlet of raw water or air. However, if the module has a module diameter of 50 to 400 mm and a module length of about 500 to 3000 mm, one small bundle 2a may be composed of 50 to 800 hollow fiber membranes, more preferably about 100 to 500 hollow fibers. .

  Examples of the synthetic polymer resin 4 that fixes the hollow fiber bundle 2 to the cylindrical cases 3 and 17 include an epoxy resin and a polyurethane resin. Further, in the hollow fiber membrane module of the present invention, since the yarn swings more than the module that fixes both ends of the hollow fiber membrane to the cylindrical case, two types of synthetic polymer resins 4 are used to prevent yarn breakage. A two-layer structure is preferable. That is, it is also preferable that the filtration region side interface of the hollow fiber membrane 2 be an elastic body such as a silicone resin or a urethane resin.

On the other hand, as the resin used for the closing member 5, various heat such as a thermosetting resin such as an epoxy resin, a urethane resin, a silicone resin, and a polyester resin, polyethylene, polypropylene, a material constituting the hollow fiber membrane, and the like. A molten resin of a plastic resin may be used. Preferably, a resin having a JIS-K6253 (2004) type A durometer hardness of about 5 to 95 is used in order to prevent yarn damage at the interface between the blocking member and the hollow fiber membrane. It is also preferable to laminate a resin having the above hardness on a resin having high hardness. The type A durometer hardness of JIS-K6253 (2004) is measured by using a measuring instrument described in JIS-K6253 (2004) and pressing the stylus against the surface of the resin. When the actual product cannot be pressed, a sample is separately molded and measured. The closing member 5 is a filling density of the hollow fiber membrane 2 into the cylindrical cases 3 and 17, the size of the gap between the yarn bundles, etc. It can be made into various shapes according to. For example, it can be a columnar body as shown in FIGS. 1 and 2, a spherical body as shown in FIG. 3, or a streamlined body as shown in FIG. Further, although not shown, a cone, a pyramid, a plate, or the like may be used. Also, in the case of a columnar body, a circular shape that is easy to mold and difficult to break is preferable, but the cross section may be a polygon such as a triangle, a quadrangle, a pentagon, a hexagon, an ellipse, or a star. . Further, in the case of a hollow fiber membrane module that filters raw water containing a large amount of suspended matter, as shown in FIG. 10, a turbulent flow generator 16 composed of blades, spiral grooves, etc. is provided on the surface of the closing member 5. Is preferred. By doing so, raw water or air can collide with the turbulent flow generation section 16 to impart minute vibrations and vibrations to the hollow fiber bundle.

  Further, when resin is used as the closing member, as shown in FIG. 9, if the end portion of the hollow fiber membrane 2 is arranged in the metal container 15, the resin is injected and solidified, and the end surface of the hollow fiber membrane is closed, In addition to being able to perform an efficient closing operation, it can be used as a module as it is, so that a weight effect by metal can be obtained. At this time, the metal container 15 is preferably stainless steel (SUS).

  In order to prevent a decrease in the filling rate of the hollow fiber membrane into the cylindrical case by the closing member 5, it is also preferable to shift the positions of the adjacent closing members 5 in the axial direction (vertical direction) of the hollow fiber membrane module. .

  Furthermore, each closing member 5 that closes the end surface of the hollow fiber membrane 2 in units of small bundles may be connected to a part of the closing member 5 adjacent to the closing member 5. For example, it is a structure which connects each obstruction | occlusion member with a rod-shaped body and a string-shaped body. With such a structure, the respective blocking members are connected with each other, so that only the blocking member at a specific location is not shaken, and vibration and swinging force can be transmitted to other blocking members. . At the same time, the position of each small bundle can be gently regulated, and the effect of preventing the occurrence of dirt spots and the effect of preventing the entanglement of each small bundle can be further improved by improving the dispersibility of raw water and air. .

  Also, as shown in FIG. 5 and FIG. 6, by installing a partition member 8 for partitioning the small bundles 2a at positions corresponding to the closing members 5 in the cylindrical case 2, the positions of the small bundles can be loosened. The dispersibility of raw water and air can be improved, and the effect of preventing the occurrence of dirt spots and the effect of preventing the entanglement of each small bundle can be further improved. The material of the partition member 8 is not particularly limited, but the same material as that of the cylindrical cases 3 and 17 is preferable in consideration of joining of the partition member 8 and future disposal.

  Next, the procedure for using the hollow fiber membrane module shown in FIG. 1 will be described.

  First, in the process of filtering the raw water, the air introduction valve, the first drainage valve, and the second drainage valve are closed, and the raw water introduction pump is driven with the filtrate valve opened to feed the raw water from the inlet 12, and the filtrate From the filtrate outlet 13 to the filtrate outlet path.

  At this time, as the filtration proceeds, suspended substances in the raw water adhere to the outer surface of the hollow fiber membrane, the filtration resistance increases, and the membrane permeation flow rate decreases. Therefore, backwashing and air scrubbing are performed.

  In backwashing, the raw water introduction pump is stopped, the first drain valve and the filtrate valve are closed, the second drain valve is opened, and the filtrate valve is opened for a predetermined time to allow water to permeate through the hollow fiber. .

  In the air scrubbing, the raw water introduction pump is stopped, the first drainage valve and the filtrate valve are closed, the second drainage valve is opened, the air introduction valve is opened for a predetermined time, and the hollow fiber membrane module 1 is opened. Introduce air.

  In this way, drainage is performed after backwashing and air scrubbing. At the time of drainage, the raw water introduction pump is stopped, the first drainage valve is opened with the second drainage valve opened, and the hollow fiber membrane module 1 Drain all the water inside.

  Next, a procedure for using the immersion type hollow fiber membrane module shown in FIG. 12 will be described.

  First, in the process of filtering raw water, the air introduction valve and the first drain valve are closed, the suction pump is driven with the filtrate valve opened, and the raw water is poured from the cylindrical case 17, and the filtrate is fed to the filtrate outlet 13. To the filtrate outlet.

  At this time, as the filtration proceeds as in the hollow fiber membrane module shown in FIG. 1, suspended substances in the raw water adhere to the outer surface of the hollow fiber membrane, the filtration resistance increases, and the membrane permeation flow rate decreases. Therefore, backwashing and air scrubbing are performed.

  In backwashing, the suction pump is stopped, the first drain valve is closed, the filtrate valve is opened for a predetermined time, and water is allowed to permeate from the inside of the hollow fiber.

  In the air scrubbing, the suction pump is stopped, the first drain valve and the filtrate valve are closed, the air introduction valve is opened for a predetermined time, and air is introduced into the hollow fiber membrane module 2.

  In this way, drainage is performed after backwashing and air scrubbing, but at the time of drainage, the suction pump is stopped and discharged from the first drainage valve and the treated water outlet provided in the immersion tank to the outside of the immersion tank. .

<Example 1>
The lake water of Lake Biwa was filtered using the hollow fiber membrane module shown in FIG. 1, and then backwashing, air scrubbing, and drainage were performed.

The lake water is supplied by a pump at 83 L / m ² · hr and filtered for 30 minutes, then backwashed with 100 L of filtered water, and air is blown into the module from the inlet 12 at 200 L / min for 1 minute, and then Drained. This filtration, backwashing, air scrubbing and drainage cycle was repeated.

  Moreover, as the hollow fiber membrane 2, 9000 porous hollow fiber membranes made of polyvinylidene fluoride having an outer diameter of 1.5 mm, an inner diameter of 0.9 mm, and a length of 1870 mm were used. The cylindrical case was made of vinyl chloride resin and had an inner diameter of 193 mm and a length of 2000 mm.

  Epoxy resin was used for the synthetic polymer resin 4 and the closing member 5. Further, the closing member 5 was formed in a cylindrical shape, and the end surfaces of the small bundles 2a in the range of 420 to 430 hollow fiber membranes were collectively sealed.

  As a result, even after 22 days, the difference between the pressure in the cylindrical case 3 and the pressure in the upper cap 6 did not become 150 kPa.

<Comparative Example 1>
The filtration, backwashing, air scrubbing, and drainage cycles were repeated in the same manner as in Example 1 except that both ends of the hollow fiber membrane 2 were fixed to the cylindrical case 3 with the synthetic polymer resin 4.

  As a result, in 7 days, the difference between the pressure in the cylindrical case 3 and the pressure in the upper cap 6 became 150 kPa.

<Example 2, Comparative Example 1>
Except for the following changes, filtration, backwashing, air scrubbing, and drainage were performed in the same manner as in Example 1 and Comparative Example 1, and the degree of soiling of the hollow fiber membrane was observed from the transparent case.
(1) The number of hollow fiber membranes 2 was 1800.
(2) The cylindrical case 3 was an acrylic transparent cylinder having an inner diameter of 100 mm and a length of 1000 mm.
(3) As raw water, 60L of RO permeated water mixed with ferric hydroxide at 1000ppm is supplied at 83L / m ² · hr and circulated and filtered for 1 hour. Ferric hydroxide was deposited. The amount of ferric hydroxide attached was determined by the color density of the hollow fiber membrane surface.
(4) Air scrubbing was performed at an air supply rate of 20 L / min for 30 seconds, and no backwashing was performed.

  As a result, the hollow fiber membrane module in the form of Example 2 has a lighter color on the entire surface of the hollow fiber membrane than in Comparative Example 2, and is excellent in removing ferric hydroxide adhering to the membrane surface. I understood that.

It is a schematic longitudinal cross-sectional view which shows one Embodiment of the hollow fiber membrane module which concerns on this invention. It is the elements on larger scale of the hollow fiber membrane module of FIG. 1 which shows the state which closed the lower end of the hollow fiber membrane for every small bundle unit with the closure member. It is a schematic longitudinal cross-sectional view which shows other embodiment (occlusion member is spherical shape) of the hollow fiber membrane module which concerns on this invention. It is a schematic longitudinal cross-sectional view which shows other embodiment (the obstruction | occlusion member is streamline shape) of the hollow fiber membrane module which concerns on this invention. It is a schematic longitudinal cross-sectional view which shows other embodiment (form which provided the partition member) of the hollow fiber membrane module which concerns on this invention. It is a cross-sectional view of the portion provided with the partition member of the hollow fiber membrane module of FIG. It is a schematic longitudinal cross-sectional view of the conventional hollow fiber membrane module. It is a schematic longitudinal cross-sectional view of the conventional hollow fiber membrane module. It is a schematic perspective view of the closure member which consists of a composite of resin and a metal. It is a schematic perspective view of the closure member which provided the wing | blade on the surface. It is a schematic longitudinal cross-sectional view of the conventional immersion type hollow fiber membrane module. It is a schematic sectional drawing which shows one Embodiment of the immersion type hollow fiber membrane module which concerns on this invention.

Explanation of symbols

1: hollow fiber membrane module 2: hollow fiber membrane 2a: small bundle 3: cylindrical case 4: synthetic polymer resin 5, 5a, 5b: closing member 6: upper cap 7: lower cap 8: partition member 9: air diffuser Plate 10: Air diffuser 11: Blocking portion 12: Inlet 13: Filtrate outlet 14: Outlet 15: Metal container 16: Wing 17: Cylindrical case (for immersion type)

Claims (6)

A hollow fiber membrane module in which a large number of hollow fiber membranes are housed in a cylindrical case, wherein one end of the hollow fiber membrane is fixed to the cylindrical case with the end face open, The other end is divided into a plurality of small bundles, and the end face is closed together in units of the small bundles. 2. The hollow fiber membrane module according to claim 1, wherein an end surface of the other end of the hollow fiber membrane is closed with a closing member made of a resin or a composite of resin and metal. The hollow fiber membrane module according to claim 1 or 2, wherein the closing member has a columnar shape, a spherical shape, or a streamline shape. The said obstruction | occlusion member is a hollow fiber membrane module in any one of Claims 1-3 which has a turbulent flow generation part on the surface. The hollow fiber membrane module in any one of Claims 1-4 which provided the partition member which partitions off in the said small bundle unit in the position corresponding to the other edge part of the said hollow fiber membrane in a cylindrical case. The hollow fiber membrane module according to any one of claims 1 to 5, wherein the cylindrical case is an open system through which water can flow.

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