JP2012115747A - Hollow fiber membrane module, and hollow fiber membrane module filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module having a raw water supplying opening part provided to the sealing edge member thereof and capable of sufficiently spreading raw water over the whole of a hollow fiber membrane bundle by ensuring a stable raw water flow channel without being affected by the state of the raw water supplied from the opening part to perform more efficient filtering treatment, and a hollow fiber membrane module filter.SOLUTION: The hollow fiber membrane module includes the hollow fiber membrane bundle wherein a large number of hollow fiber membranes having opening edges are arranged so as to provide predetermined gaps and the sealing edge members provided to one end of the hollow fiber membrane bundle to seal and fix the edge parts on the side opposite to the opening end parts of the hollow fiber membranes. The opening part for supplying the raw water to the central part of the hollow fiber membrane bundle is provided to the central part of the sealing edge member and a flow channel element having the cylindrical shape corresponding to the opening part, capable of keeping the shape of the hollow fiber membrane bundle and having raw water freely entering and exiting flow holes provided to the side peripheral surface thereof is provided to the raw water flow channel space continuously formed to the opening part.

Description

  The present invention relates to a hollow fiber membrane module and a hollow fiber membrane module filtration device that are used for wastewater treatment, seawater desalination and the like and have a high flux.

  In recent years, a hollow fiber membrane module filtration device that filters raw water such as seawater using a hollow fiber membrane module formed by concentrating a plurality of hollow fiber membranes in a wastewater treatment system or a seawater desalination system has been proposed. ing.

  And as the filtration method, compared with the method of filtering from the inner surface side of the hollow fiber membrane to the outer surface side (internal pressure method), the membrane area contributing to filtration per unit volume can be secured large, and the cost In general, a method of filtering from the outer surface side to the inner surface side of the hollow fiber membrane (external pressure type) is widely adopted (for example, Patent Documents 1 and 2).

JP-A-5-57154 JP-A-5-212254

  However, even with an external pressure type, it is difficult to say that the conventional hollow fiber membrane module filtration device has a sufficient flux (unit area, filtration amount per unit time), and more efficient filtration treatment. Was desired.

  The inventor of the present invention, in the conventional external pressure-type hollow fiber membrane module filtration device, the reason why a sufficient flux could not be secured is that the supply of raw water is performed from the outside to the inside of the hollow fiber membrane bundle, It was confirmed that the raw water did not reach the hollow fiber membrane near the center sufficiently, and the flow of the raw water was not uniform in the hollow fiber membrane module.

  This will be described with reference to FIGS. FIG. 5 is a view schematically showing a conventional external pressure type hollow fiber membrane module. FIG. 6A is a cross-sectional view schematically illustrating the basic structure of a conventional hollow fiber membrane module with a reduced number of hollow fiber membranes, and FIG. It is a top view of a part. 5 and FIG. 6 are not proportional to each other because the intent of drawing is different.

  In each figure, 1 is a hollow fiber membrane module, 2 is a hollow fiber membrane, 3 is a hollow fiber membrane bundle, 4 is a sealing end member, 5 is an outer cylinder, 6 is a gap, 7 is a water collection chamber, and 8 is a raw water supply Mouths 9 are filtered water outlets, and 10 and 11 are raw water drains.

  As shown in FIGS. 5 and 6, in the conventional hollow fiber membrane module filtration apparatus, the hollow fiber membrane module 1 includes a hollow fiber membrane bundle 3 formed by converging a large number of hollow fiber membranes 2, a hollow fiber A sealed end member 4 for sealing and fixing one end of each hollow fiber membrane 2 is provided at one end of the membrane bundle 3, and the sealed end member 4 faces the raw water supply port 8 of the outer cylinder 5. It is stored in the outer cylinder 5 so that it does.

  For this reason, the flow direction of the raw water taken from the raw water supply port 8 of the outer cylinder 5 is changed by the sealing end member 4, and the gap 6 between the hollow fiber membrane bundle 3 and the outer cylinder 5, that is, the hollow fiber membrane bundle. 3 is further supplied to the gaps between the hollow fiber membranes 2 from the outer peripheral portion of the hollow fiber membrane bundle 3.

  The raw water reaching the outer surface of each hollow fiber membrane 2 is filtered from the outer surface side of the hollow fiber membrane 2 toward the inner surface side. The filtered filtered water is sent inside the hollow fiber membrane 2 toward the water collecting chamber 7 and sent from the filtered water outlet 9 to a water storage container or the like separately provided outside.

  However, in such a structure, since the raw water is supplied to the gap between the hollow fiber membranes only from the outside of the hollow fiber membrane bundle, the raw water sufficiently passes between the hollow fiber membranes near the center of the bundle. The flow of raw water was not uniform in the hollow fiber membrane module, and a sufficient flux could not be secured.

  In view of this, the present inventor provided an opening for supplying raw water from the inside of the hollow fiber membrane bundle at the center of the sealed end member for sealing and fixing one end of the hollow fiber membrane bundle as a solution. The proposed hollow fiber membrane module was proposed (Japanese Patent Application No. 2010-173549: filed on August 2, 2010).

  This will be described with reference to FIG. FIG. 7A is a cross-sectional view schematically drawn for explaining the basic structure of the hollow fiber membrane module proposed above, and FIG. 7B is a plan view of a sealed end portion. As shown in FIG. 7, in the hollow fiber membrane module 1 proposed above, an opening 4 a for directly supplying raw water to the inside of the hollow fiber membrane bundle 3 is provided at the center of the sealed end member 4. The raw water taken in from the raw water supply port 8 is sent to the outer peripheral portion of the hollow fiber membrane bundle 3 and supplied to the gap 6 between the hollow fiber membranes, and is a flow path formed continuously from the opening 4a. It is supplied to the gap between the hollow fiber membranes from the inside of the hollow fiber membrane bundle 3 via the space 12. For this reason, raw water can be uniformly supplied to the whole hollow fiber membrane bundle 3, and sufficient flux can be ensured. As a result, sufficient filtration performance can be exhibited and efficient filtration treatment can be performed.

  However, in the above proposal, when the state of the raw water supplied from the opening 4a (a supply amount, a supply pressure, etc.) changes, along the flow path space 12 of the raw water formed at the center of the hollow fiber membrane bundle 3 Further, the hollow fiber membrane 2 may swing, the shape of the flow path space 12 may not be stable, and a sufficient flux may not be ensured stably.

  Therefore, the present invention provides an opening for supplying raw water to the sealing end member, and ensures a stable raw water passage space without being affected by the state of the raw water supplied from the opening. It is an object of the present invention to provide a hollow fiber membrane module and a hollow fiber membrane module filtration device capable of sufficiently spreading the entire hollow fiber membrane bundle and performing a more efficient filtration treatment.

  As a result of diligent research, the present inventor has found that the above problems can be solved by the invention shown in the following claims, and has completed the present invention. Hereinafter, each bill will be described.

The invention described in claim 1
A hollow fiber membrane module used in a hollow fiber membrane module filtration device that filters raw water from the outer surface side to the inner surface side of the hollow fiber membrane,
A hollow fiber membrane bundle in which a plurality of hollow fiber membranes having open ends are arranged with a predetermined gap;
Provided with one end of the hollow fiber membrane bundle, and a sealing end member that seals and fixes an end opposite to the opening end of the hollow fiber membrane,
An opening for supplying raw water to the center of the hollow fiber membrane bundle is provided at the center of the sealed end member,
In the flow path space of the raw water formed continuously with the opening, the shape of the hollow fiber membrane bundle can be maintained in a tubular shape corresponding to the opening, and the raw water can freely enter and exit the side peripheral surface. A hollow fiber membrane module, characterized in that a flow path element having an appropriate flow hole is provided.

  In the invention of this claim, a cylindrical flow path element is provided in the flow path space of the raw water formed at the center of the hollow fiber membrane bundle to maintain the shape of the hollow fiber membrane bundle, Since it is restrained, the hollow fiber membrane does not oscillate depending on the state of the raw water supplied from the opening, and a stable flow path of the raw water can be ensured.

  Since the flow passage element is provided with a flow hole through which the raw water can freely enter and exit, the raw water that has passed through the flow path element is passed through the gap between the hollow fiber membrane bundles 3 from the inside of the hollow fiber membrane bundle 3. Can be fully distributed. As a result, since sufficient raw water can be supplied to each of the hollow fiber membranes, a more efficient filtration process can be performed.

  As a material of the flow path element, for example, PP, PE and the like can be preferably used.

  And as a magnitude | size of a circulation hole, if it is a magnitude | size which can fully supply raw | natural water to each hollow fiber membrane, it will not specifically limit, Usually, it is preferable to set it as a diameter of about 10-100 mm.

  In addition, the shape of the flow path element may be a cylindrical shape having a diameter corresponding to the diameter of the opening, but in consideration of the fact that raw water is difficult to spread at a location away from the opening, the diameter increases as the distance from the opening increases. It is also preferable to use an inverted frustoconical shape with a large diameter.

  As the hollow fiber membrane, for example, a hollow fiber membrane made of polytetrafluoroethylene (PTFE) can be preferably used. Moreover, it does not specifically limit as a hole diameter of a hollow fiber membrane, Any MF membrane, LF membrane, and UF membrane can be used preferably.

The invention described in claim 2
The hollow fiber membrane module according to claim 1, wherein the flow path element is a mesh-shaped flow path element.

  The mesh-shaped flow path element is preferable because it can increase the area of the flow hole and can be easily manufactured.

The invention according to claim 3
2. The hollow fiber membrane module according to claim 1, wherein the flow hole is formed larger as the distance from the opening is increased.

  By increasing the flow hole of the flow path element as it moves away from the opening, raw water can be sufficiently supplied to the place away from the opening, as with the opening.

The invention according to claim 4
2. The hollow fiber membrane module according to claim 1, wherein a number of the flow holes are formed as the distance from the opening portion increases.

  By increasing the number of flow holes of the flow path element as the distance from the opening portion increases, raw water can be sufficiently supplied to the place away from the opening portion, similarly to the opening portion.

The invention described in claim 5
The hollow fiber membrane module according to any one of claims 1 to 4, wherein the flow path element also serves as an aeration flow path element during backwashing.

  When continuous filtration is performed using a hollow fiber membrane module, poorly soluble components, polymer solutes, colloids, and micro solids contained in the raw water gradually deposit on the membrane surface (fouling). This causes a decrease in flux and clogging of the membrane.

  Therefore, as appropriate, the liquid is flowed from the filtered water side to the raw water side to remove the fouling substances adhering to the membrane as turbidity (backwashing), as opposed to normal filtration.

  At this time, turbidity such as a fouling layer formed on the membrane surface on the raw water side can be easily and reliably removed by performing aeration (bubbling) simultaneously with backwashing using an aeration mechanism. , Membrane performance can be recovered efficiently.

  In the present invention, at the time of backwashing, the flow path element is used as the aeration flow path element, and the raw water flow path is used as the aeration flow path. For this reason, aeration can be spread over the entire bundle of hollow fiber membranes without causing oscillation of the hollow fiber membrane with respect to aeration, effectively removing turbidity such as a fouling layer. Can do.

The invention described in claim 6
The hollow fiber membrane module according to any one of claims 1 to 5, wherein the hollow fiber membrane module filtration device is housed in an outer cylinder,
A raw water supply port is provided at one end of the outer cylinder, and a filtered water outlet is provided at the other end,
The hollow fiber membrane module filtration device, wherein the hollow fiber membrane module is disposed so that a sealing end member provided in the hollow fiber membrane module faces the raw water supply port.

  Since the hollow fiber membrane module is provided with a flow path element in the center and stably distributes raw water over the entire hollow fiber membrane bundle, more efficient filtration can be performed. .

  According to the present invention, an opening for supplying raw water to the sealing end member is provided, and a stable flow path of raw water is secured without being affected by the state of the raw water supplied from the opening. It is possible to provide a hollow fiber membrane module and a hollow fiber membrane module filtration device that can be sufficiently spread over the entire hollow fiber membrane bundle and can perform a more efficient filtration treatment.

It is a figure which shows typically the hollow fiber membrane module of the 1st Embodiment of this invention. (A) is sectional drawing drawn typically, reducing the number of hollow fiber membranes, in order to demonstrate the basic structure of the hollow fiber membrane module of the 1st Embodiment of this invention, (b) It is a top view of a sealing end part. It is a figure which shows typically the hollow fiber membrane module of the 2nd Embodiment of this invention. It is a figure which shows typically the hollow fiber membrane module of the 3rd Embodiment of this invention. It is a figure which shows the conventional hollow fiber membrane module typically. In order to explain the basic structure of a conventional hollow fiber membrane module, it is a cross-sectional view schematically drawn with the number of hollow fiber membranes reduced, and (b) is a plan view of a sealed end portion. It is sectional drawing drawn typically, reducing the number of hollow fiber membranes in order to demonstrate the basic structure of the other conventional hollow fiber membrane module, (b) is a top view of a sealing edge part.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram schematically showing a hollow fiber membrane module according to a first embodiment of the present invention. (A) of FIG. 2 is a cross-sectional view schematically drawn by reducing the number of hollow fiber membranes in order to explain the basic structure of the hollow fiber membrane module according to the first embodiment of the present invention. b) is a plan view of the sealed end. 1 and FIG. 2 are not proportional to each other because the intent of drawing is different. Moreover, each figure of FIGS. 1-7 is the figure typically shown for the convenience of an understanding, and although only the hollow fiber bundle of one layer is drawn, according to the diameter of a hollow fiber membrane module actually Thus, a plurality of layers of hollow fiber bundles surround the flow path element.

  The hollow fiber membrane module 1 according to the present embodiment includes a plurality of hollow fiber membranes 2 constituting a hollow fiber membrane bundle 3 and a sealed end member 4 that closes and seals and fixes the lower ends of the hollow fiber membranes 2. Have. The hollow fiber membrane module 1 has one opening 4a at the center of the sealing end member 4, and is substantially columnar without the hollow fiber membrane 2 being provided at the center of the hollow fiber membrane bundle 3, and the upper end is closed. A flow path space 12 is provided. Further, a skirt 4 b for preventing the raw water supplied from the raw water supply port 8 from flowing too far outside the hollow fiber membrane bundle 3 is provided on the outer peripheral portion of the sealed end member 4 on the raw water supply port 8 side. Yes. The upper end of the hollow fiber membrane 2 opens into the water collection chamber 7, and the filtered water filtered by the hollow fiber membrane 2 is collected in the water collection chamber 7 and discharged from the filtered water outlet 9.

  A cylindrical flow path element 13 is fitted in the flow path space 12. The flow path element 13 is disposed on the innermost side of the hollow fiber membrane bundle 3 and close to the hollow fiber membrane 2 (hollow fiber membrane 2 constituting the outline of the flow path space 12). In addition, a large number of flow holes 13a are formed in the flow path element 13 over the entire length and the entire circumference, and the flow holes 13a are formed by punching or mesh mesh.

  The hollow fiber membrane module 1 configured as described above is accommodated in the outer cylinder 5 to form a hollow fiber membrane module filtration device, which is used for filtration such as seawater desalination.

  According to the hollow fiber membrane module 1 according to the present embodiment, the raw water taken from the raw water supply port 8 is sent to the outer peripheral portion of the hollow fiber membrane bundle 3. At the same time, the raw water is also directly supplied to the central portion of the hollow fiber membrane bundle 3 through the opening 4 a and the flow path space 12. At this time, the force of the raw water flowing into the flow path space 12 is applied to the hollow fiber membrane 2 in the center, but the movement of the hollow fiber membrane 2 is restricted by the flow path element 13, so Can prevent movement.

  For this reason, since the flow path space 12 is not narrowed by the swinging of the hollow fiber membrane 2 and a stable raw water flow path space can be secured, a sufficient amount of raw water is reliably supplied to the hollow fiber membrane bundle 3. In addition, since the position of the hollow fiber membrane 2 is stabilized, the raw water flow in the hollow fiber membrane 2 becomes smooth, and stable filtration in the hollow fiber membrane 2 becomes possible. As a result, the flux of the hollow fiber membrane 2 on the center side of the hollow fiber membrane bundle 3 can be reliably improved, and a sufficient flux can be secured as the entire hollow fiber membrane module 1.

  In addition, the backwashing device used for washing the hollow fiber membrane 2 includes a washing water supply means (not shown) for causing the washing water to flow back into the device from the filtered water outlet 9, and aeration air to the raw water supply port. 8 is provided with an aeration supply means (not shown) for supplying the inside of the apparatus from the apparatus 8, thereby cleaning the pores of the hollow fiber membrane 2 by supplying aeration while flowing back the washing water.

  That is, the washing water flows into the hollow fiber membrane 2, passes through a large number of fine pores formed on the side of the hollow fiber membrane 2, and flows out of the hollow fiber membrane 2. The suspended matter adhering to the thread membrane 2 is washed away. Moreover, since the bubbling effect is added, the turbid separation is further promoted. The removed turbidity is discharged from the raw water drains 10 and 11 to the outside.

  At this time, the bubbling effect extends to the hollow fiber membrane 2 at the center of the hollow fiber membrane bundle 3 through the flow path space 12. At that time, a bubbling force is applied to the hollow fiber membrane 2 in the center. However, since the movement of the hollow fiber membrane 2 is restricted by the flow channel element 13, the flow channel space 12 is formed by the oscillation of the hollow fiber membrane 2 by the bubbling. It is possible to prevent the supply amount of aeration air from being reduced and to reduce the amount of aeration air, and to ensure a desired bubbling effect at the center of the hollow fiber membrane bundle 3. A cleaning effect can be reliably exerted on the yarn film 2.

(Second Embodiment)
FIG. 3 is a diagram schematically showing a hollow fiber membrane module according to the second embodiment of the present invention. As shown in FIG. 3, the second embodiment has the same configuration as the first embodiment, except that the size of the flow hole 13a of the flow path element 13 is set so as to increase toward the upper side. It has become.

  Since the momentum (pressure) of the flow becomes weaker as the raw water goes upward, the raw water does not easily reach the upper side of the flow path space 12. For this reason, it becomes difficult for raw | natural water to spread over the full length of the hollow fiber membrane 2, and the flux of the hollow fiber membrane 2 becomes small.

  In the second embodiment, since the size of the flow hole 13a of the flow path element 13 is set so as to increase toward the upper side, the outflow of raw water from the flow hole 13a of the flow path element 13 is suppressed on the lower side, On the upper side, the outflow of raw water from the flow hole 13a of the flow path element 13 can be promoted. For this reason, raw | natural water can be spread over the full length of the flow-path space 12, and as a result, sufficient flux can be ensured as the hollow fiber membrane module 1 whole.

(Third embodiment)
FIG. 4 is a diagram schematically showing a hollow fiber membrane module according to a third embodiment of the present invention. As shown in FIG. 4, in the present embodiment, the flow path element 13 is formed in an inverted truncated cone shape whose upper side is widened, and the number of flow holes 13a of the flow path element 13 is increased toward the upper side. Except for the set points, the configuration is the same as that of the first embodiment.

  Even in this manner, as in the second embodiment, the raw water can be uniformly distributed over the entire length of the flow path space 12, and a sufficient flux can be secured as the entire hollow fiber membrane module 1. can do.

  In the third embodiment, since the flow path element 13 is formed in an inverted truncated cone shape, the hole density can be increased toward the upper end, the hole diameter can be increased, and a higher flux can be obtained. .

  Hereinafter, the present invention will be described in more detail with reference to an example in which the hollow fiber membrane module filtration device of the present invention is used for seawater desalination.

1. Hollow fiber membrane module filtration device (1) Hollow fiber membrane module As a hollow fiber membrane module, the material is polytetrafluoroethylene (PTFE), outer diameter 2.3mm, inner diameter 1.1mm, film thickness 0.6mm, total length 1200mm A hollow fiber membrane having an effective length of 1000 mm was used.

  Moreover, the opening diameter of the flow path space 12 is 20 mm, and the full length is 1000 mm. The diameter of the sealing end member is 80 mm, and the outer diameter of the outer cylinder is 114 mm.

(2) Flow path element About the flow path element 13, the following three types of types 1-3 were prepared.

(A) Type 1 (Example 1)
The type 1 flow path element is formed by punching a PP sheet having a thickness of 1 mm into a cylindrical shape having an inner diameter of 20 mm and a total length of 1000 mm. The circulation holes 13a have the same diameter and a hole diameter of 10 mm over the entire surface of the flow path element 13, and the number of holes is equal and the hole density is 0.5 holes / cm ² .

(B) Type 2 (Example 2)
The type 2 flow path element is formed by punching a PP sheet having a thickness of 1 mm into a cylindrical shape having an inner diameter of 20 mm and a total length of 1000 mm. The number of holes of the flow holes 13a is 0.5 / cm ² with the same density over the entire surface of the flow path element 13, and the diameter of the flow holes 13a is 10 mm at the flow hole 13a at the lower end of the flow path element 13. The upper end flow hole 13a is 30 mm, and is set so as to gradually increase from the lower end toward the upper end.

(C) Type 3 (Example 3)
The type 3 flow path element is formed by forming a punched PP sheet having a thickness of 1 mm into an inverted truncated cone shape having a total length of 1000 mm. The inner diameter of the lower end of the flow path element 13 is 10 mm, and the inner diameter of the upper end is 40 mm. The inner diameter increases linearly from the lower end toward the upper end, and is formed in an inverted truncated cone shape as a whole. The hole diameter of the flow hole 13a is the same diameter over the entire surface of the flow path element 13, the same hole density, the hole diameter is 10 mm, the hole density is 0.5 holes / cm ² , and the number of holes increases toward the upper end. ing.

2. Flux About Examples 1-3 and the comparative example 1 using the hollow fiber membrane module which does not have a flow path element, the flux was investigated by performing a filtration test.

(1) Filtration test (a) Filtration test method Seawater is supplied at a substantially constant pressure of 50 kPa and subjected to total filtration (a method in which the total amount of membrane feed water is filtered). The bundle (m / d) was determined. In addition, it designed as the pressure of 20 kPa and the differential pressure of 30 kPa in the outflow port to the exterior of filtered water. Moreover, the external pressure system was employ | adopted for the filtration system.

(B) Filtration test results Table 1 summarizes the filtration test results.

(2) Consideration From Table 1, it was confirmed that the flux of the example was larger than that of the comparative example. The reason why the flow rate of the embodiment is so large is that the provision of the flow path element 13 makes it easier for raw water to flow inside the hollow fiber membrane bundle, and to spread evenly throughout the hollow fiber membrane bundle. It is.

  Further, it was confirmed that the flux of Examples 2 and 3 was larger than that of Example 1. The large fluxes of Examples 2 and 3 are such that the raw water can be spread evenly over the entire length of the flow path space 12, so that the hollow fiber membrane module 1 as a whole has a sufficient flow rate. This is because a bundle could be secured.

  As mentioned above, according to this invention, since the flux at the time of filtering water can be enlarged, water treatment, such as desalination of seawater and wastewater treatment, can be performed more efficiently.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Hollow fiber membrane module 2 Hollow fiber membrane 3 Hollow fiber membrane bundle 4 Sealed end member 4a Opening part 4b Skirt 5 Outer cylinder 6 Gap 7 Water collection chamber 8 Raw water supply port 9 Filtrated water outlet 10, 11 Raw water drainage port 12 Road space 13 Flow path element 13a Flow hole

Claims (6)

A hollow fiber membrane module used in a hollow fiber membrane module filtration device that filters raw water from the outer surface side to the inner surface side of the hollow fiber membrane,
A hollow fiber membrane bundle in which a plurality of hollow fiber membranes having open ends are arranged with a predetermined gap;
Provided with one end of the hollow fiber membrane bundle, and a sealing end member that seals and fixes an end opposite to the opening end of the hollow fiber membrane,
An opening for supplying raw water to the center of the hollow fiber membrane bundle is provided at the center of the sealed end member,
In the flow path space of the raw water formed continuously with the opening, the shape of the hollow fiber membrane bundle can be maintained in a tubular shape corresponding to the opening, and the raw water can freely enter and exit the side peripheral surface. A hollow fiber membrane module, characterized in that a flow path element having various flow holes is provided.   The hollow fiber membrane module according to claim 1, wherein the flow path element is a mesh-shaped flow path element.   The hollow fiber membrane module according to claim 1, wherein the flow hole is formed to be larger as the distance from the opening is increased.   2. The hollow fiber membrane module according to claim 1, wherein a number of the flow holes are formed as the distance from the opening portion increases.   The hollow fiber membrane module according to any one of claims 1 to 4, wherein the flow path element also serves as an aeration flow path element during backwashing. The hollow fiber membrane module according to any one of claims 1 to 5, wherein the hollow fiber membrane module filtration device is housed in an outer cylinder,
A raw water supply port is provided at one end of the outer cylinder, and a filtered water outlet is provided at the other end,
The hollow fiber membrane module filtration device, wherein the hollow fiber membrane module is disposed so that a sealing end member provided in the hollow fiber membrane module faces the raw water supply port.

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