JP5626355B2 - Flat hollow fiber membrane element and immersion water treatment device - Google Patents

Description

The present invention relates to a flat hollow fiber membrane element and an immersion water treatment apparatus used in an immersion water treatment apparatus.
This application claims priority on September 12, 2011 based on Japanese Patent Application No. 2011-198257 for which it applied to Japan, and uses the content here.

  An immersion type water treatment apparatus for the purpose of water purification and wastewater treatment has been put into practical use (see, for example, Patent Documents 1 and 2). As disclosed in Patent Documents 1 and 2, this type of submerged water treatment apparatus generally has a plurality of membrane elements incorporating filtration membranes installed in a frame, and the frame in which a plurality of membrane elements are installed in a treatment tank. It is configured by arranging it above the diffuser.

  Also, as disclosed in Patent Documents 1 and 2, some membrane elements use a sheet-like membrane body and others use a hollow fiber membrane. The membrane element disclosed in Patent Document 1 is configured such that a membrane body is surrounded from four sides by a membrane plate. Further, in the hollow fiber membrane element disclosed in Patent Document 2, one end side of a plurality of hollow fiber membranes 10 fixed by a hollow fiber membrane closing member 12 and the other end side by a hollow fiber membrane fixing member 11 are used. After fixing, it accommodates in a cylindrical container and is comprised by supporting the hollow fiber membrane fixing member 11 in the upper part of a cylindrical container.

JP 2009-148743 A JP 2009-222010 A

By the way, the membrane element is required to increase the processing amount per volume, and if the cylindrical container is removed from the hollow fiber membrane element according to Patent Document 2, the hollow fiber membrane fixing member 11 and the hollow fiber membrane are equivalent to the absence of the cylindrical container. The hollow fiber membrane 10 disposed on the closing member 12 can be increased, and the treatment amount per volume of the immersion water treatment apparatus can be increased.
However, in such a configuration, since the hollow fiber membrane fixing member 11 and the hollow fiber membrane blocking member 12 are merely connected by the hollow fiber membrane 10, there is no stability, and handling during a moving operation or an assembling operation is not possible. It is hard to say that the property is good.

  The present invention has been made in view of the actual situation, and a flat hollow fiber membrane element capable of increasing the density of the hollow fiber membrane while maintaining good handleability during moving work and assembly work, and An object is to provide an immersion water treatment apparatus.

  As a means for solving the above problems, the first aspect of the present invention is that a plurality of hollow fiber membranes arranged in a sheet form and one end side of the hollow fiber membrane are fixed and arranged above the hollow fiber membrane. A flat hollow fiber membrane element having a first housing and a second housing fixed to the other end of the hollow fiber membrane and disposed below the hollow fiber membrane, wherein the first housing comprises: A water intake port for flowing filtrate is provided, and the water intake port is disposed so that an upper inner surface of the water intake port and at least a part of the upper inner surface of the first housing are located on the same plane in the horizontal direction. This is a flat hollow fiber membrane element.

  In the flat hollow fiber membrane element, the water intake may be arranged such that the upper inner surface of the water intake and the entire upper inner surface of the first housing are located on the same plane in the horizontal direction. In the above flat hollow fiber membrane element, the upper inner surface of the first housing includes at least one load receiving member, and the load receiving member has a lower surface of the load receiving member and an upper inner surface of the intake port. And may be arranged so as to be located on the same plane in the horizontal direction.

In the flat hollow fiber membrane element, the water intake may be provided so as to protrude in the extending direction of the first housing along the direction in which the hollow fiber membranes are arranged.
In this case, among the upper inner surface of the first housing, it is preferable that the vicinity of the joint portion of the protruding water intake port be positioned on the same plane in the horizontal direction as the upper inner surface of the water intake port.
Moreover, in the flat hollow fiber membrane element, the first housing protrudes in the extending direction of the first housing along the direction in which the hollow fiber membranes are arranged on the side where the intake port is provided. A second projecting portion projecting in the extending direction of the first housing on a side opposite to the side provided with the water intake; On the side where the second protrusion is provided, the third protrusion protrudes in the extending direction of the second housing along the direction in which the hollow fiber membranes are arranged, and the water intake port of the first housing is provided. It is preferable to have a flat mounting portion on the other side.
Further, the vertical cross section in the fitting axial direction of at least one of the first protrusion, the second protrusion, and the third protrusion is non-circular, and a groove is formed on the outer periphery along the circumferential direction. It is preferable that an elastic body is fitted in the groove.

  Moreover, the 2nd side surface of this invention is an immersion type water treatment apparatus provided with the above-mentioned flat type | mold hollow fiber membrane element.

According to a third aspect of the present invention, there is provided a hollow fiber membrane element holding device including an element holding portion, a support column, and a carriage so that the element holding portion engages with an upper inner surface of the first housing of the hollow fiber membrane element. This is a hollow fiber membrane element holding device.

Since the flat hollow fiber membrane element of the present invention can be suspended in a stable state by inserting a rod-shaped jig from the water intake, only the hollow fiber membrane is between the first housing and the second housing. Can be easily moved even in the case of being coupled with each other, and the handleability in the moving work and the assembling work can be improved. Also, the removal work can be performed well.
In addition, even when the first housing and the second housing are connected only by the hollow fiber membrane, the handling property in the moving operation and the assembling operation can be improved, so that the first housing and the second housing Without providing a rigid connecting member for stabilization or the like, it is possible to increase the density of the hollow fiber membrane by expanding the region where the hollow fiber membrane is disposed. Further, by omitting the connecting member as described above, it is possible to achieve compactness while achieving high density.

In addition, when the upper inner surface of the intake port and the entire upper inner surface of the first housing are positioned on the same surface in the horizontal direction, the first housing can be easily manufactured when molding.
When the upper inner surface of the first housing includes at least one load receiving member, and the lower surface of the load receiving member is positioned on the same plane as the upper inner surface of the water intake port, The first housing can be manufactured using an existing housing.
In addition, in the upper inner surface of the first housing, when the upper inner surface near the joint portion of the protruding intake port is positioned on the same plane in the horizontal direction as the upper inner surface of the intake port, Such a load can be dispersed.

  Further, when the first housing has a first protrusion and a second protrusion, and the second housing has a third protrusion and a flat mounting portion, a flat hollow The flat hollow fiber membrane element can be suitably installed on a frame in which a plurality of yarn membrane elements can be installed. In particular, if recesses or the like that are engaged with the second and third protrusions provided on the opposite side of the water intake are formed in the frame, the second and third protrusions are engaged with these recesses from the horizontal direction. Assembling workability can be improved.

  In addition, the vertical cross section in the fitting axial direction of at least one of the first to third projections is non-circular, a groove is formed on the outer periphery of the projection, and an elastic body is fitted into the groove. In this case, when the second protrusion is engaged with the recess or the like, swinging around the protrusion can be restricted, and wear can be suppressed by the elastic body.

It is a perspective view of the immersion type water treatment apparatus concerning a 1st embodiment of the present invention. It is a front view of the immersion type water treatment apparatus concerning a 1st embodiment. It is a front view of the flat type | mold hollow fiber membrane element with which the immersion type water treatment apparatus which concerns on 1st Embodiment is provided. It is a left view of the flat type hollow fiber membrane element with which the immersion type water treatment apparatus which concerns on 1st Embodiment is provided. It is a right view of the flat type | mold hollow fiber membrane element with which the immersion type water treatment apparatus which concerns on 1st Embodiment is provided. It is a longitudinal cross-sectional view of the flat hollow fiber membrane element in the state in which the flat hollow fiber membrane element which concerns on 1st Embodiment was installed in the rack. It is sectional drawing of the flat type | mold hollow fiber membrane element which concerns on 1st Embodiment which follows the AA line of FIG. 3B. It is a figure explaining the installation method with respect to the rack of the flat type hollow fiber membrane element which concerns on 1st Embodiment. It is sectional drawing of the flat type | mold hollow fiber membrane element which concerns on the 2nd Embodiment of this invention. It is a front view of the hollow fiber membrane element holding device of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a submerged water treatment apparatus 1 according to the first embodiment of the present invention, and FIG. 2 is a front view thereof. In the following description, the upper side is the upper side, the lower side is the lower side, the left side is the left side, and the right side is the right side.

  The submerged water treatment apparatus 1 according to the present embodiment includes a membrane module unit 3 provided in the membrane separation tank 2 and an aeration device 4 for membrane cleaning. The membrane module unit 3 includes a suction pump 5. And a blower (not shown) is connected to the air diffuser 4. The air diffuser 4 includes a plurality of air diffusers 6 that are provided below the membrane module unit 3 and are tubular bodies that communicate with the blower.

  The air diffuser 4 discharges air supplied from the blower from a plurality of gas discharge ports formed in the air diffuser 6. Thereby, in the submerged water treatment device 1, the air bubbles continuously or intermittently diffused from the gas discharge port of the air diffuser 4 reach the membrane module unit 3 through the liquid to be treated, and then Released from the water surface.

  The membrane module unit 3 includes a plurality of liquid-permeable hollow fiber membranes 7 arranged in a sheet form, a first housing 8 that fixes the upper end side of the hollow fiber membrane 7 and is disposed above, and a hollow fiber. A plurality of flat hollow fiber membrane elements 10 having a lower housing side fixed to a lower housing 9 and a second housing 9 disposed below are provided, and these flat hollow fiber membrane elements 10 are arranged in parallel with a rack 11. It is configured.

  The first and second housings 8 and 9 each have a long rectangular shape when viewed from the front, and extend in the left-right direction (that is, the direction in which a plurality of hollow fiber membranes are arranged) to extend the rack 11. It is supported by. The left end of the first housing 8 is provided with a water intake 12 that protrudes to the left and allows filtered water to flow. One end of a pipe member 13 that is cranked in a U-shape is connected to the water intake 12. The other end of the piping member 13 is connected to a water collection header 14 disposed above the rack 11.

  The hollow fiber membrane 7 has a plurality of pores. In the membrane module unit 3, the water to be treated in the membrane separation tank 2 is suction filtered through the pores of the hollow fiber membrane 7 by the suction pump 5. Thus, the water to be treated is separated into solid and liquid. The treated water treated by each flat hollow fiber membrane element 10 is collected together by a water collection header 14 through a piping member 13.

  3A to C show a front view, a right side view, and a left side view of the flat hollow fiber membrane element 10, respectively. In the flat hollow fiber membrane element 10, the left end provided with the water intake 12 of the first housing 8 is shown. A first protrusion 15 is formed in the first portion 15 projecting leftward along the extending direction of the first housing 8, and a first projecting portion 15 projecting rightward along the extending direction of the first housing 8 is formed at the right end portion. Two protrusions 16 are formed. The first protrusion 15 has a circular cross section perpendicular to the extending direction and is located below the water intake 12. A groove 17 is formed in the outer periphery of the first protrusion 15 along the circumferential direction. A ring-shaped resin elastic body 18 is fitted into the groove 17 as an elastic body. Further, the cross section of the second protrusion 16 perpendicular to the extending direction is non-circular, and similarly, a groove 19 is formed on the outer periphery along the circumferential direction. The resin elastic body 20 is fitted into the groove 19. ing.

On the other hand, a third projection 21 is formed at the right end of the second housing 9 so as to protrude rightward along the extending direction of the second housing 9, and a flat mounting portion 22 is formed at the left end. Projecting leftward. A groove 23 is formed on the outer periphery of the third protrusion 21, and a ring-shaped resin elastic body 24 is fitted in the groove 23.
Examples of the resin elastic body include packing and resin molding material that match the shape of the protrusion. Examples of the material include EPDM, silicone, and NBR.

  In the submerged water treatment apparatus of the present invention, the flat hollow fiber membrane element 10 is fixed to the rack 11 via the first protrusion 15, the second protrusion 16, the third protrusion 21, and the attachment portion 22. As shown in FIGS. 1 and 2, the rack 11 is composed of a plurality of frame members. The rack 11 has a cross frame 26 installed on top of the left and right standing frames 25L and 25R that rise from the left and right sides of the air diffuser 4, and a left upper frame 27 that extends from the upper part of the left standing frame 25L in the element connecting direction. A left lower frame 28 extending from the lower part of the left standing frame 25L in the element connecting direction, an upper right frame 29 extending from the upper part of the right standing frame 25R in the element connecting direction, The lower right frame 30 that extends from the lower portion of the installation frame 25R in the direction in which the elements are arranged, and the frame (not shown) similar to the left and right standing frames 25L and 25R that are located on the back side of the drawing.

As shown in FIG. 4, the upper right frame 29 has a plurality of engagement holes 31 corresponding to the number of elements to be installed, and the lower right frame 30 A plurality of engagement holes 32 with which the third protrusions 21 are engaged are formed corresponding to the number of elements to be installed. The second protrusion 16 is formed to engage with the engagement hole 31, and the third protrusion 21 is engaged with the engagement hole 32.
A plurality of fixing plates 33 that are suspended from the upper left frame 27 and engage with the first protrusions 15 are fixed to the upper left frame 27 according to the number of elements to be installed. As shown in FIG. 2, a plurality of screw holes 34 for screwing and fixing the attachment portion 22 are formed in the lower left frame 28, and the attachment portion 22 is fastened by bolts.

As shown in FIG. 5, the flat hollow fiber membrane element 10 of the present embodiment is such that the upper inner surface of the water intake 12 and the entire upper inner surface of the first housing 8 are on the same plane in the horizontal direction. It is configured. 4 and 5, reference numeral 35 denotes a potting resin. The potting resin 35 fixes the hollow fiber membrane 7 to the first housing 8 and the second housing 9.
Here, the “upper inner surface” means a surface that is provided on the inner wall of the housing and the intake port and generates a vertical load. The upper inner surface “entire area” of the housing indicates an almost entire area of the inner surface length in the longitudinal direction of the housing.
Examples of the potting resin include epoxy resins, unsaturated polyester resins, polyurethane resins, silicone fillers, and various hot melt resins. The initial viscosity of the fixing resin is 3,000 to 200,000 mPa · s, preferably 5,000 to 100,000 mPa · s, and more preferably 10,000 to 50,000 mPa · s.

In the flat hollow fiber membrane element 10 of the present embodiment, the jig 36 having a circular vertical cross section in the insertion axis direction can be inserted into the first housing 8 from the water intake 12. If the jig 36 is set along the horizontal direction, the flat hollow fiber membrane element 10 is suspended in a state where the first housing 8 is set along the horizontal direction on the jig 36. As a result, during the assembly work to the rack 11, as shown in FIG. 6, the operator hangs the flat hollow fiber membrane element 10 with the jig 36 along the horizontal direction, and The mold hollow fiber membrane element 10 can be installed on the rack 11 from one direction.
In the flat hollow fiber membrane element of the present invention, the mounting portion is formed so that the frame can be fastened to the flat hollow fiber membrane element with a bolt.
Here, “the insertion axis direction of the jig” means the central axis in the longitudinal direction of the part of the jig that is actually inserted into the first housing. For example, in the jig shown in FIG. 6, since the inserted portion has a rod shape, the fitting axial direction is the longitudinal direction of the rod-shaped portion.

As shown in FIG. 8, the jig 36 can be inserted into the first housing 8 and includes a rod-shaped element holding portion 38 for holding the hollow fiber membrane element 10 and a support column 39.
The element holding part 38 needs to be designed so as to have a strength to receive the load of the flat hollow fiber membrane element 10 without bending and to damage the inner surface of the first housing 8.
It is important that the shape of the element holding portion 38 is engaged with a protrusion provided in the same horizontal plane (that is, the upper inner surface of the first housing 8) provided in the first housing 8, and the strength is maintained. However, any cross-sectional shape can be designed as long as the above items are satisfied.
For example, by using a vertically long I-shaped or T-shaped cross section in the vertical direction as a shape that has a deflection strength against a load and hardly damages the inner surface of the first housing 8. Contact can be minimized.
Moreover, while reducing the cross-sectional area of the front-end | tip of the element holding | maintenance part 38, and making a front-end | tip chamfer or make spherical shape, the insertion to the 1st housing 8 can be performed smoothly.
Further, the length of the element holding portion 38 can be arbitrarily designed as long as it can hold the load of the hollow fiber membrane element 10 without bending. However, in consideration of smooth insertion and easy attachment / detachment of the jig, the first holding portion 38 can be designed. The length of the housing 8 is preferably ½ or less, more preferably 、 ３ or less.
Further, the element holding portion 38 may have a fixing means for the flat hollow fiber membrane element 10 so that the flat hollow fiber membrane element 10 does not fall off during transportation of the flat hollow fiber membrane element 10. preferable.
It is important that the column 39 is designed to have sufficient strength against the load of the element holding portion 38 and the flat hollow fiber membrane element 10 held by the element holding portion.
Moreover, it is preferable that the support | pillar 39 has a height adjustment means which can change arbitrarily the holding height of the element holding | maintenance part 38. FIG.
The material of the jig 36 is not particularly limited, but a stainless steel material having high strength and low corrosivity and FRP (fiber reinforced plastic) are preferable.

  Here, in this embodiment, in order to maintain the jig 36 along the horizontal direction, the jig 36 is fixed to the carriage 37 as shown in FIG. If the horizontal state of the jig 36 is maintained in this way, when the flat hollow fiber membrane element 10 is installed in the rack 11, the second protrusion 16 and the third protrusion 21 are moved as shown in FIG. Each can be easily engaged and positioned in the engagement holes 31 and 32, and the assembly work of the flat hollow fiber membrane element 10 becomes easy. Further, when the flat hollow fiber membrane element 10 is assembled, it is necessary to remove the fixing plate 33. However, as shown in FIG. 6, if the portion is exposed to the outside of the jig 36, When the flat hollow fiber membrane element 10 is installed, the fixing plate 33 can be fixed easily.

As described above, since the flat hollow fiber membrane element 10 of the present embodiment can be suspended in a stable state by inserting the rod-shaped jig 36 from the water intake port 12, the first housing 8 The flat hollow fiber membrane element 10 can be easily moved even when the hollow housing 7 and the second housing 9 are connected only by the hollow fiber membrane 7, and the handling work in the moving work and the assembling work is facilitated. Can be good. Also, the removal work can be performed well.
Further, even when the first housing 8 and the second housing 9 are connected only by the hollow fiber membrane 7, it is possible to improve the handleability in the moving work and the assembling work. Without providing a rigid coupling member for stabilization or the like between the second housing 9 and expanding the area of the hollow fiber membrane 7 to increase the membrane area, the processing per hollow fiber membrane element High capacity can be designed. In addition, even when there is the above-mentioned connecting member, it can be stably suspended, so that it is easy to handle.

  Moreover, in the said embodiment, although the upper inner surface of the water intake 12 and the upper inner surface whole region of the 1st housing 8 are located on the same surface in a horizontal direction, in this structure, when mold-molding Fabrication of the first housing 8 is facilitated.

  The first housing 8 is provided with a first protrusion 15 and a second protrusion 16, the second housing 9 is provided with a third protrusion 21 and an attachment 22, and the frame 11 is flat. Since the hollow fiber membrane element 10 is installed and the second projecting portion 16 and the third projecting portion 17 are configured to engage with the engaging holes 31 and 32 formed in the frame 11 from the horizontal direction, Workability can be improved.

Furthermore, since the first protrusion 15, the second protrusion 16, and the third protrusion 21 are respectively provided with the resin elastic bodies 18, 20, and 24, swinging when supported by the rack 11 is suppressed. Wear can be suppressed. Furthermore, since the shape of the vertical cross section with respect to the fitting axial direction of the second protrusion 16 is a non-circular shape, the swing of the entire flat hollow fiber membrane element 10 can be suppressed.
Here, the “insertion axial direction” is a direction that coincides with the direction in which the jig of the first element is inserted. For example, in the case of FIG. 6, it refers to a direction that coincides with the longitudinal direction of the rod-shaped portion of the jig to be inserted.

The “non-circular shape” specifically includes an elliptical shape, a cross shape, a polygonal shape, and the like, but an elliptical shape is more preferable because a general-purpose O-ring can be used as a resin elastic body.

  In the first embodiment, the configuration in which the upper inner surface of the water intake 12 and the entire upper inner surface of the first housing 8 are located on the same plane in the horizontal direction has been described. A part of the inner surface may protrude downward, and the lower surface thereof may be positioned on the same plane as the upper inner surface of the water intake port 12 in the horizontal direction.

As described above, the jig 36 can be used to easily hold, transport, and assemble by simply inserting the element holding portion into the first housing 8.
In addition, by holding, transporting, and assembling with a simple structure in which the element holding portion is simply inserted into the first housing 8, there is no need to provide an extra holding mechanism or joining structure on the outer peripheral portion of the first housing 8. Therefore, even when a plurality of hollow fiber membrane elements are held and fixed in a limited space, they do not interfere with each other and do not hinder the flow of the non-treatment fluid.

  Next, a second embodiment of the present invention will be described. Constituent elements similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the present embodiment, as shown in FIG. 7, the upper inner surface of the water intake 12 and the entire upper inner surface of the first housing 8 ′ are not located on the same plane in the horizontal direction, but the upper portion of the first housing 8 ′. The lower surfaces of the two load receiving members 40 provided separately on the inner surface are configured so as to be located on the same plane as the upper inner surface of the water intake port 12 in the horizontal direction. Both of the load receiving members 40 are arranged on the side opposite to the intake port 12 side with respect to the longitudinal center of the first housing 8 ′.
Here, the load receiving member refers to the case where the upper inner surface of the first housing is not positioned on the same plane as the upper inner surface of the water intake port, that is, the upper inner surface of the first housing is more than the upper inner surface of the water intake port. When positioned above, the load receiving member is a member disposed on the upper inner surface of the first housing so that the lower surface of the load receiving member is positioned on the same plane as the upper inner surface of the water intake port. The load receiving member is a member that plays a role of supporting the entire weight of the flat hollow fiber membrane element when the flat hollow fiber membrane element is suspended from a hollow fiber membrane element holding device described later.

In such a configuration, by using an existing housing, a jig (that is, an element holding portion) is inserted into the housing, and the first housing 8 ′ that can hold, transport, and assemble the hollow fiber membrane element is provided. Can be produced. In addition, in the said 2nd Embodiment, although the two load receiving members 40 were provided, you may provide one or three or more. In addition, when a part of the upper inner surface of the first housing 8 or 8 ′ is made to coincide with the upper inner surface of the water inlet 12 through the first and second embodiments, a part of the upper inner surface is at least the housing. It is preferable to be arranged on the side opposite to the water intake 12 side with respect to the center in the longitudinal direction. By doing so, the posture when the jig 36 separated from the water intake 12 is inserted is stabilized.
In addition, of the upper inner surface of the first housing 8 or 8 ′, the vicinity of the joint portion of the protruding water intake 12 may be located on the same plane in the horizontal direction as the upper inner surface of the water intake 12. In this case, the load applied near the joint between the water intake 12 and the first housing 8 or 8 'can be dispersed.
Here, “the vicinity of the joint portion” on the upper inner surface of the first housing means a portion of 0 to 25 area% of the entire upper inner surface of the first housing from a portion (joint portion) where the first housing and the water intake are joined. means

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit thereof.

Since the flat hollow fiber membrane element of the present invention can be suspended in a stable state by inserting a rod-shaped jig from the water intake, only the hollow fiber membrane is between the first housing and the second housing. Can be easily moved even in the case of being coupled with each other, and the handleability in the moving work and the assembling work can be improved. Also, the removal work can be performed well.
In addition, even when the first housing and the second housing are connected only by the hollow fiber membrane, the handling property in the moving operation and the assembling operation can be improved, so that the first housing and the second housing Without providing a rigid connecting member for stabilization or the like, it is possible to increase the density of the hollow fiber membrane by expanding the region where the hollow fiber membrane is disposed. Further, by omitting the connecting member as described above, it is possible to achieve compactness while achieving high density.

DESCRIPTION OF SYMBOLS 1 Submerged type water treatment apparatus 7 Hollow fiber membrane 8, 8 '1st housing 9 2nd housing 10 Flat type hollow fiber membrane element 12 Water intake 15 1st projection part 16 2nd projection part 17 groove | channel 18 Resin elastic body 19 groove | channel 20 Resin elastic body 21 3rd protrusion 23 Groove 24 Resin elastic body 40 Load receiving member

Claims (4)

A plurality of hollow fiber membranes arranged in a sheet form, one end side of the hollow fiber membrane is fixed, a first housing disposed above the hollow fiber membrane, and the other end side of the hollow fiber membrane is fixed A flat hollow fiber membrane element having a second housing disposed below the hollow fiber membrane,
The first housing includes a water intake through which filtered water flows.
The water intake is disposed such that the upper inner surface of the water intake and at least a part of the upper inner surface of the first housing are located on the same plane in the horizontal direction ,
The water intake is provided to project in the extending direction of the first housing along the direction in which the hollow fiber membranes are arranged,
The first housing has a first protrusion protruding in the extending direction of the first housing along the direction in which the hollow fiber membranes are arranged on the side where the water intake is provided, and the water intake is provided. A second protrusion projecting in the extending direction of the first housing on the opposite side of the first housing, the second housing on the side provided with the water intake port of the first housing. A flat hollow fiber membrane element having a third protrusion protruding in the extending direction of the second housing along the direction in which the membranes are arranged, and having a flat mounting portion on the opposite side of the third protrusion . A vertical cross section in the fitting axial direction of at least one of the first protrusion, the second protrusion, and the third protrusion is non-circular, and a groove is formed on the outer periphery along the circumferential direction. , flat hollow fiber membrane element according to claim 1, the elastic body is fitted into the groove. An immersion type water treatment apparatus comprising the flat hollow fiber membrane element according to any one of claims 1 and 2 . A plurality of hollow fiber membranes arranged in a sheet form, one end side of the hollow fiber membrane is fixed, a first housing disposed above the hollow fiber membrane, and the other end side of the hollow fiber membrane is fixed A flat hollow fiber membrane element having a second housing disposed below the hollow fiber membrane,
The first housing includes a water intake through which filtered water flows.
The intake port is used in a flat hollow fiber membrane element in which an upper inner surface of the intake port and at least a part of an upper inner surface of the first housing are positioned on the same plane in the horizontal direction. ,
A hollow fiber membrane element holding device comprising an element holding part, a support column and a carriage,
The hollow fiber membrane element holding device, wherein the element holding portion is configured to engage with an upper inner surface of the first housing of the flat hollow fiber membrane element.

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