JP2005205369A - Membrane module unit and connection member used in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection member which is low-cost and facilitates a reliable connection between a membrane module and a collecting header, and to provide a membrane module unit capable of stably performing solid-liquid separation by means of a separation membrane for a long period. <P>SOLUTION: The connection member connects the membrane module and the collecting header and forms a passage of filtrate from the membrane module to the collecting header. The connection member has two or more hollow members, the two or more hollow members are connected via an elastic seal liquid-tightly and slidably to each other to form a connector, one end of the connector is made to be a collecting header connection part as a connection part for being connected to the collecting header and the other end of the connector is made to be a membrane module connection part as a connection part for being connected to the membrane module. The connection parts have elastic seals for connecting the connectors liquid-tightly and slidably and have covers regulating the positions of the two or more hollow members. The membrane module unit is provided with the connection member. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connecting member that guides filtered water from a membrane module used for separation operations such as water purification and sewage treatment to a water collection header, and also relates to a membrane module unit in which membrane modules are connected by a connecting member.

  In water treatment such as water purification and sewage treatment, various methods for solid-liquid separation of water to be treated using a membrane module provided with a separation membrane such as a microfiltration membrane and an ultrafiltration membrane have been studied. When water to be treated is filtered using a separation membrane, treated water with high water quality can be obtained.

  When solid-liquid separation of water to be treated is performed using a separation membrane, the clogging of the separation membrane proceeds due to suspended substances (SS content) as the filtration treatment continues, so the filtration flow rate decreases or the transmembrane pressure difference Rise. In order to recover from such a state, a technique is known in which an air diffuser is provided at the lower part of the membrane separation apparatus, and the air is diffused during filtration or while filtration is stopped.

  Patent Document 1 (Japanese Patent Laid-Open No. 5-261253), Patent Document 2 (Japanese Patent Laid-Open No. 6-342), Patent Document 3 (Japanese Patent Laid-Open No. 6-340), and the like disclose a sheet-like hollow in a rectangular housing. Using a hollow fiber membrane module in which the yarn membrane is resin-fixed, the distance between adjacent membrane modules is kept constant, bubbling is performed from the air diffuser, and the flow of water to be treated is uniformly applied to the membrane module to stabilize it. A method for performing liquid separation is disclosed.

In order to arrange a large number of membrane modules at a uniform interval with the adjacent membrane modules, a large number of membrane modules are connected in a liquid-tight manner with piping materials to a tubular water collecting header in which holes for connecting the membrane modules are formed. A method for collecting and taking out the filtrate is known.
Japanese Patent Laid-Open No. 5-261253 JP-A-6-342 JP-A-6-340

  When the membrane module and the membrane module unit are increased in size for the purpose of increasing the throughput, the diameter of the filtered water outlet is increased and the water collection header is also increased in accordance with the amount of filtered water flowing.

  Since the membrane module is required to be compact as well as to improve the throughput, the membrane module is made as thin as possible. Therefore, the diameter of the filtered water outlet is also reduced. In many cases, filtered water cannot be smoothly flowed from one outlet, and in such a case, a plurality of filtrate outlets are provided in one membrane module.

  It is difficult to directly connect the enlarged membrane module and the water collection header due to variations in the size of each member.

  For this reason, a flexible flexible tube or a resin tube is used to connect the large membrane module and the water collection header. These piping materials are relatively expensive.

  Further, such a flexible pipe is connected to the water collection header in a liquid-tight manner by tightening with a nut or the like using a packing. In a membrane module unit in which a large number of membrane modules are assembled, there are many connection points, and therefore, packing tightness or tube insertion failure may occur during assembly. Also, during use, the nut that holds the packing may loosen due to vibration, resulting in poor sealing. That is, when the flexible pipe as described above is used, it cannot be said that the assemblability is good, and there is room for improvement in that the water treatment is stably performed for a long period of time.

  The object of the present invention is lightweight, compact and capable of absorbing dimensional errors, but is more inexpensive, and it is easy to reliably connect the membrane module and the water collection header, and the solid-liquid separation treatment by the separation membrane. It is to provide a connecting member that can be stably performed over a long period of time.

  Another object of the present invention is to provide a membrane module unit that is lightweight and compact, is cheaper, and can stably perform solid-liquid separation over a long period of time.

According to the present invention, a connection member for connecting a membrane module and a water collection header, and forming a flow path of a filtrate from the membrane module to the water collection header,
It has a plurality of hollow members, the plurality of hollow members are liquid-tight and slidably connected via an elastic seal to form a connection body,
One end of the coupling body is a water collection header connection portion which is a connection portion for connecting to the water collection header,
The other end of the coupling body is a membrane module connection part which is a connection part for connecting to the membrane module,
The water collecting header connecting portion has an elastic seal for connecting the coupling body to the water collecting header in a liquid-tight and slidable manner,
The membrane module connection portion has an elastic seal for connecting the coupling body to the membrane module in a liquid-tight and slidable manner,
There is provided a connection member having a cover for regulating the positions of the plurality of hollow members.

  In the connection member, it is preferable that the hollow member having the water collection header connection portion and the hollow member having the membrane module connection portion are resin molded products.

  In the connection member, it is preferable that the hollow portions of the plurality of hollow members have a circular cross section having an inner diameter of 0.5 cm to 5 cm.

  In the connecting member, it is preferable that the resin molded product is made of a resin having a flexural modulus of 1 GPa or more.

  According to the present invention, there are provided a plurality of membrane modules, a water collection header, and a connection member that connects the plurality of membrane modules and the water collection header to form a flow path of the filtrate from each membrane module to the water collection header. The membrane module unit is characterized in that the connection member is the connection member described above.

  In the membrane module unit, the membrane module is preferably a hollow fiber membrane module in which a hollow fiber membrane bundle end portion is accommodated in a rectangular housing and liquid-tightly fixed by a fixing member.

  According to the connection member of the present invention, the connection port for taking out the filtrate from the membrane module and the water collecting header are slidably and liquid-tightly connected using a plurality of hollow members and an elastic seal, so that it is compact. Nevertheless, it is possible to absorb the dimensional error of the membrane module and the water collection header and to flow the filtrate from the membrane module to the water collection header. At this time, since it is not necessary to use a flexible pipe, it can be made relatively inexpensive. The position of the hollow member is regulated by the cover, and there is no need to tighten a nut or the like at the connection portion. Therefore, it is easy to assemble, and there is no risk of a seal failure due to vibration that causes the nut to loosen. Can process. Furthermore, since a lightweight member such as a resin molded product can be used for the hollow member, the connecting member is lightweight.

  The membrane module unit in which the membrane module and the water collection header are connected by such an excellent connecting member is lightweight and compact, and is inexpensive and can stably perform water treatment for a long period of time.

  Hereinafter, although the form of this invention is demonstrated in detail using drawing, this invention is not limited to these.

  FIG. 1 is a schematic cross-sectional view showing an example of the connection member of the present invention. FIG. 1 also shows a water collection header and a part of the membrane module. FIG. 2 is a schematic cross-sectional view showing a membrane module unit in which the membrane module is connected to the water collection header by this connecting member. In this example, a total of two resin molded products of the L-shaped molded product female 1a and the L-shaped molded product male 1b are used as the hollow members.

  In the connecting member 100 shown in FIG. 1, the L-shaped molded female 1a is hollow and has an L-shaped tubular shape, and filtered water from the membrane module flows into the hollow portion. The L-shaped molded product female 1a has a connection portion 4 to the water collecting header 9 and a connection portion 6 to the L-shaped molded product male 1b. The connecting portion 4 with the water collecting header 9 is provided with a groove, and the elastic seal 2 is attached to the groove. Furthermore, the protrusion 3a which regulates the depth inserted in the water collection header 9 is provided. On the other hand, the water collection header 9 is provided with a connection port 9 a that can be fitted with the connection portion 4.

  The L-shaped molded product male 1b is hollow and has an L-shaped tubular shape, and filtered water from the membrane module flows through the hollow portion. The L-shaped molded product male 1b has a connecting portion 5 to the membrane module 11 (more specifically, a filtered water intake 16 provided in the housing 13a) and a connecting portion 7 to the L-shaped molded product female 1a. . The two connecting portions 5 and 7 are provided with grooves, and the elastic seal 2 is attached to each of the grooves. Furthermore, the protrusion 3b which regulates the depth inserted in the filtered water intake 16 of the membrane module is provided.

  One flow path in which filtrated water flows through the hollow portion of the L-shaped molded product female and the L-shaped molded product male, with the L-shaped molded product female and the L-shaped molded product male fitted and connected via an elastic seal Is formed. And the water collection header connection part 4 of the end of the connection body with which these were connected is fitted by the connection port 9a of a water collection header, and is connected to a water collection header via an elastic body seal. The membrane module connection part 5 at the other end of the coupling body is fitted into the filtered water intake 16 of the membrane module, and is connected to the membrane module through an elastic seal.

  The structure of the portion to which the connection member of the water collection header is connected (connection port 9a in FIG. 1) and the structure of the portion to which the connection member of the membrane module is connected (filtered water outlet 16 in FIG. 1) are fitted with the connection member. A structure that can be combined can be appropriately adopted. When the water collecting header connecting portion 4 and the membrane module connecting portion 5 of the connecting member are shaped as shown in FIG. 1, for example, a tubular member or a hole into which these connecting portions can be inserted is formed in the water collecting header 9 and the housing 13a of the membrane module. What is necessary is just to be provided. The tubular members and holes into which these connecting parts are inserted need only have an inner surface smoothness and dimensional accuracy that can be liquid-tightly fitted through an elastic seal. What processed this, and what made the hole in the flat plate can be used. In FIG. 1, the connection port 9a is a pipe attached to the water collecting header, and the filtered water intake port 16 is a communication hole communicating with a hollow portion in the housing opened in the housing 13a.

  In addition, by restricting the depth at which the connection member is inserted, it is possible to excellently suppress the occurrence of a shift during use or a seal failure due to excessive insertion, so that the projections 3a and 3b of the connection member are provided. Is preferred. Moreover, it can replace with these, for example, can also provide structures, such as a protrusion for restricting the depth which inserts a connection member in the water collection header or a membrane module side, or changing a diameter and providing a level difference.

  The hollow members (L-shaped molded female 1a and L-shaped molded male 1b in the form of FIG. 1) are preferably resin molded products because they are relatively inexpensive and easy to mold. The resin molded product is obtained by molding a resin, and the molding method can be appropriately selected from known resin molding methods such as injection molding.

  The resin used for the resin molded product can be appropriately selected in consideration of the use environment and processability. Examples include thermoplastic resins such as vinyl chloride resin, polyolefin resin, polystyrene resin, ABS resin, polycarbonate resin, polyamide resin, polyester resin, modified polyphenylene ether resin, and polyacetal resin. These resins can be used alone or in combination depending on the application.

  Regarding the mechanical strength of the resin used in the resin molded product, the bending specified in JIS K7171 (Plastic-Bending Characteristic Testing Method) is used from the viewpoint of suppressing the deformation of the molded product and maintaining the liquid tightness of the fitting portion. The elastic modulus is preferably 1 GPa or more. Further, from the viewpoint of ease of molding, the flexural modulus is preferably 10 GPa or less. Further, the resin may be reinforced. For example, when the strength higher than the intrinsic strength of the resin is required, the fitting portion needs to be liquid-tight, so a fiber reinforced resin in which the mixing amount of the filler is adjusted to the extent that the surface smoothness is not lowered is resin-molded. You may use for goods. In this case, from the same viewpoint as described above, it is preferable that the reinforcing resin has a flexural modulus of 1 GPa or more and 10 GPa or less.

  The connection parts 6 and 7 between the L-shaped molded product female 1a and the L-shaped molded product male 1b, the connection part 4 between the water collecting header 9 and the L-shaped molded product female 1a, and the connection part 5 between the membrane module and the L-shaped molded product male 1b are The elastic body 2 is slidably connected via the elastic body seal 2. Each sliding part can absorb the manufacturing dimensional error of the water collection header 9 and the membrane module 11, and can connect the water collection header 9 and the membrane module 11 satisfactorily. In the above example, the connecting member has two hollow members, but may similarly have three or more hollow members via an elastic seal.

  FIG. 4 is a schematic cross-sectional view showing another example of the connection member of the present invention. This connecting member has a total of three hollow members of two L-shaped molded products and one I-shaped member. In this embodiment, an elastic seal is provided to extend between the two L-shaped molded products of the form shown in FIG. 1 by an I-shaped member and connect fluidly and slidably. It is what. One flow path through which filtered water from the membrane module flows is formed by the two L-shaped molded products and the hollow portion of one I-shaped member.

  As the I-type member, any hollow member having a shape that can be fitted to the outer diameter of the L-shaped molded product at both ends can be used. For example, a pipe, particularly a circular pipe can be used. The inner diameter of the member does not necessarily have the same diameter and shape as a whole, and may be thicker or thinner in the middle. Moreover, it does not necessarily need to be a straight pipe, and the shape of the outer diameter may be different from the shape of the inner diameter. That is, the I-shaped member shown in FIG. 4 includes a hollow member having a water collection header connection portion (L-shaped molded female 1a in the form shown in FIG. 4) and a hollow member having a membrane module connection portion (shown in FIG. 4). In the form, it is an example of a flow path extending member that connects the L-shaped molded product male 1b) to extend the flow path.

  In contrast to the example of FIG. 4, the I-shaped member can be fitted into the L-shaped molded product.

  As the I-type member 17, for example, a resin molded product obtained by molding a resin similar to the molded products 1a and 1b, for example, a thermoplastic resin, can be used. Alternatively, the material of the I-type member may be nitrile rubber, styrene rubber (SBR), silicon rubber, ethylene propylene rubber, chloroprene rubber, fluorine rubber or other rubber, or elastomer. There is no need to use flexible piping as the I-shaped member. The I-shaped member is also one of the hollow members, and as described above, a resin molded product can be preferably used because it is relatively inexpensive and easy to mold. In this case, the mechanical strength of the resin is in accordance with JIS K7171. It is preferable that the specified flexural modulus is 1 GPa or more. Moreover, 10 GPa or less is preferable from a viewpoint of the ease of a shaping | molding process. In addition, when the I-shaped member has a particularly simple shape, a metal processed product such as stainless steel or an aluminum alloy can be suitably used. As described above, the material of the I-type member can be appropriately selected according to the application.

  FIG. 1 and FIG. 4 show an L-shaped molded product bent at a right angle. However, the present invention is not limited to this. For example, one end of the L-shaped molded product and other parts are bent by stepping or curving. The angle with the end may be approximately 90 degrees. In addition, when using an I-shaped member, the L-shaped molded product can be slid by also bending the I-shaped member and the L-shaped member in the middle to form a chevron and making the angle of the crests of both members approximately the same. Can be mated. In addition, the shape of the membrane module (particularly, the housing 13) and the structure of the water collecting header can be determined as appropriate according to the arrangement of the water collecting header and the structure.

  In the present invention, the elastic body seal 2 can employ a known elastic body seal for liquid-tightness such as an O-ring and a V-ring as appropriate, but an O-ring having high sealing performance reliability is preferable. The material of the elastic body seal 2 is not particularly limited, but can be appropriately selected from nitrile rubber, styrene rubber (SBR), silicon rubber, ethylene propylene rubber, chloroprene rubber, fluororubber, and the like according to the purpose of use.

  The cover 8 is a U-shaped member that covers a hollow member (in FIG. 1, an L-shaped molded product female 1a and an L-shaped molded product male 1b, and in FIG. 4, in addition to these, an I-shaped member 17). The membrane module unit can be fixed to the frame 10 or the water collection header 9. The cover 8 has a hollow member such as an L-shaped molded product female 1 a and an L-shaped molded product male 1 b that is connected to the water collection header 9 when water or chemicals are flowed from the water collection header 9 to the membrane module to backwash the membrane module. It has a function of regulating the position of the hollow member so as not to be detached from the membrane module. The cover may have a shape other than the U-shape as long as it has this function. Further, the method for fixing the cover in the membrane module unit is not particularly limited, and may be determined as appropriate according to the material of the cover and the member to which the cover is fixed.

  The cover 8 can be made of metal, resin, or fiber reinforced resin, but is preferably a bent metal plate in view of strength and ease of processing.

  When the hollow part of the hollow member has a circular cross section, such as when the hollow member is tubular, the inner diameter is preferably 0.5 cm or more, more preferably 1 cm or more from the viewpoint of suppressing pressure loss. From the viewpoint of not reducing the integration efficiency of the membrane module, it is preferably 5 cm or less, and more preferably 3 cm or less.

  The membrane module unit of the present invention has a structure in which a plurality of membrane modules are connected to a water collection header by the connecting member.

  In the membrane module unit, the membrane module to be connected is not particularly limited. As the membrane module, a hollow fiber membrane module in which a hollow fiber membrane bundle end portion is accommodated in a rectangular housing and fixed in a liquid-tight manner by a fixing member is used. Can be used. Use of such a membrane module is preferable in that the membrane integration efficiency can be increased. Further, it is preferable to use a flat membrane module because it has good cleaning properties and is not easily clogged and can be stably filtered for a long period of time. For example, as shown in FIG. 3, a plurality of hollow fiber membranes 12 are arranged in a flat shape, and both end portions thereof are liquid-tightly fixed to rectangular housings 13a and 13b by resin fixing members 14 (both ends of the hollow fiber membranes). Are opened in the hollow portions in the housings 13a and 13b), and the hollow fiber in which the filtered water from one housing (13b) is communicated with the filtered water outlet 16 provided in the other housing (13a) through the water conduit 15 The use of a membrane module is more preferable because the integration efficiency can be increased while maintaining good cleanability. The housing has a hollow portion inside and functions as a header for collecting filtered water obtained from a plurality of hollow fiber membranes.

  As the material of the hollow fiber membrane, conventionally known materials such as cellulose-based, polyolefin-based, polysulfone-based, polyvinyl alcohol-based, polymethyl methacrylate, polyvinylidene fluoride, and polytetrafluoroethylene can be applied. Polyolefins such as polyethylene and polypropylene having high strength and elongation are preferably used from the viewpoint of the ability to deal with shaking during air diffusion. For applications that require durability against oxidizing agents, polyvinylidene fluoride, polytetrafluoroethylene, and the like are preferably used.

  The collection header 9 can be an arbitrary number depending on the shape of the membrane module, the number of filtrate outlets 16 and the like, but the flow of the filtrate from each membrane module to the collection header 9 flows as evenly as possible. It is preferable to provide as described above. For example, when there are two filtered water intakes 16 at one end of the hollow fiber membrane as in the hollow fiber membrane module shown in FIG. 3 (opposite to the housing surface provided with the filtered water intake 16 shown in FIG. 3). It is preferable to provide two water collecting headers 9 for each membrane module unit. Further, in FIG. 3, the filtered water outlet is provided only in the housing 13a at one end of the hollow fiber membrane, but the filtered water outlet may be provided in the housings 13a and 13b at both ends of the hollow fiber membrane 12. For example, as described above, one membrane water outlet is provided at each end face of the housing 13a, and one outlet is provided at each end face of the housing 13b. Two filtered water outlets can be provided. In that case, it is preferable to provide four water collecting headers 9 per one membrane module unit.

  In the membrane module unit, as the arrangement of the plurality of membrane modules, a known arrangement adopted in a hollow fiber membrane module unit or the like can be appropriately adopted. For example, a plurality of membrane modules can be arranged in a row in parallel.

  Further, the membrane modules can be arranged in a staggered state. In this case, it is possible to use a single water collection header 9 in which holes for connecting the membrane module are formed in a zigzag state, or the two water collection headers can be shifted and arranged.

  In addition, when it is set as a membrane module unit using the sheet-like hollow fiber membrane module expand | deployed in the flat type, it is preferable from the point of washing | cleaning efficiency to arrange | position so that a sheet | seat surface may face a perpendicular direction. At this time, the fiber axis direction of the hollow fiber membrane 12 can be arranged so as to face the horizontal direction or the vertical direction.

  In the membrane module unit shown in FIG. 2, the membrane module having the structure shown in FIG. 3 as described above is disposed in the frame 10, and each membrane module is connected to a connection member (hollow member having the structure shown in FIG. 1). The connector 20 is connected to the water collection header by the connected connector 20 and a cover 8) that is fixed to the frame 10 and regulates the position of the hollow member. An air diffuser 18 is provided below the membrane module unit. The water collection header extends in the direction perpendicular to the paper surface, and a plurality of membrane modules are aligned along the direction perpendicular to the paper surface.

  Hereinafter, the present invention will be described specifically by way of examples.

  ABS resin (trade name: Psycholac SW3, manufactured by UMG ABS Co., Ltd.) was injection molded, and the structure shown in FIG. 1 had an inner diameter of 1.5 cm and an outer diameter of 2.5 cm (excluding the outer diameter of the connecting portion 6). An L-shaped hollow member (L-shaped molded female 1a and male 1b) having a circular cross section was manufactured. A seal material made of a nitrile rubber (NBR) rubber O-ring (JIS designation number: P21) is attached to the groove of the L-shaped molded product male connection portion 7, and the L-shaped molded product male is inserted into the L-shaped molded product female. A connected body was obtained. Ten sets of connected bodies were prepared.

  As shown in FIG. 2, 10 membrane modules having filtered water intakes 16 (circular through-holes having a diameter of 2.7 cm) at two locations above the structure shown in FIG. 9 (circular tubular connection port 9a having an inner diameter of 2.7 cm). The membrane module has a width of 50 cm, a height of 80 cm, and a thickness of 3 cm, and the housing part has a width of 50 cm, a height of 6 cm, and an ABS resin (trade name: Psylacac). SW3: manufactured by UMG ABS Co., Ltd.). At this time, a seal material made of a nitrile rubber (NBR) rubber O-ring (JIS designation number: P21) is attached to each of the grooves provided in the connection portions 4 and 5 of the coupling body, and the connection port 9a of the water collecting header is provided. The connecting parts 4 and 5 of the connector were inserted into the filtered water intake 16 of the membrane module. At this time, the connecting portions 4 and 5 are inserted until the projection 3a contacts the side wall of the connection port 9a and until the projection 3b contacts the side wall of the housing 13a (the surface on which the filtered water intake port is formed). It is. The cover 8 was formed by bending a stainless steel plate having a thickness of 1 mm, and was fixed to the frame and the water collection header at a position covering the connection body. The cover was sized and shaped so that the connecting body attached to the water collection header and the membrane module would not come off at each connection part.

  The water collection header is a square with a cross section of 5 cm on a side, welded to a stainless steel square pipe (SUS304) with a thickness of 2 mm at intervals of 45 mm, one end of the square pipe is closed, and the other end is The filtered water outlet was welded. Furthermore, a flat plate with a screw hole for attaching the cover was welded.

  As described above, the process of connecting the hollow members to form a coupling body and the process of connecting the coupling body to the water collection header and the membrane module only require that each member be inserted into the other members, and alignment and nut tightening. Etc. are unnecessary and extremely easy. Moreover, since it is possible to prevent the connection of each member from being removed simply by attaching the cover, this is also easy in this respect.

  FIG. 2 is a cross-sectional view of the membrane module unit of the present embodiment. The inner dimensions of the membrane module unit are 50 cm wide, 50 cm deep, and 120 cm high, and are 50 cm wide, 50 cm deep, and 70 cm high below the membrane module unit. A gas device 18 is arranged. Two diffuser tubes 19 having a diameter of 7 cm were arranged in the diffuser at an interval of 25 cm.

  When the membrane module unit and the air diffuser are submerged in an activated sludge tank with a depth of 2.5 m and 250 liters of air is discharged from the air diffuser, an upward swirling flow of 100 cm per second is generated, resulting in a linear velocity of 0.8 m / It was possible to filter well for a long time in the day.

  The membrane module unit of the present invention can be suitably used for separation operations such as treatment of purified water and sewage, particularly solid-liquid separation operations.

  The connecting member of the present invention can be suitably used for producing the membrane module unit as described above.

It is typical sectional drawing which shows an example about the connection member of this invention, a water collection header, and a part of membrane module. It is typical sectional drawing which shows an example of the membrane module unit of this invention. It is a typical perspective view which shows an example of the hollow fiber membrane module used for this invention. It is typical sectional drawing which shows another example of the connection member of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a L type molded product female 1b L type molded product male 2 Elastic body seal 3a, 3b Protrusion 4 Water collecting header connection part 5 Membrane module connection part 6 Connection part of L type molded product female with L type molded product male 7 L Portion of male molded product with L-shaped molded product female 8 Cover 9 Water collecting header 9a Water collecting header connecting port 10 Frame 11 Membrane module 12 Hollow fiber membrane 13a, 13b Housing 14 Resin fixing member 15 Water conduit 16 Filtration Water outlet 17 I-shaped member 18 Aeration device 19 Aeration tube 20 L-shaped molded product female and L-shaped molded product male coupling body 100 Connecting member

Claims (6)

A connection member for connecting a membrane module and a water collection header, and forming a flow path of a filtrate from the membrane module to the water collection header,
It has a plurality of hollow members, the plurality of hollow members are liquid-tight and slidably connected via an elastic seal to form a connection body,
One end of the coupling body is a water collection header connection portion which is a connection portion for connecting to the water collection header,
The other end of the coupling body is a membrane module connection part which is a connection part for connecting to the membrane module,
The water collecting header connecting portion has an elastic seal for connecting the coupling body to the water collecting header in a liquid-tight and slidable manner,
The membrane module connection portion has an elastic seal for connecting the coupling body to the membrane module in a liquid-tight and slidable manner,
A connection member comprising a cover for restricting positions of the plurality of hollow members.   The connecting member according to claim 1, wherein the hollow member having the water collecting header connecting portion and the hollow member having the membrane module connecting portion are resin molded products.   The connection member according to claim 1, wherein the hollow portions of the plurality of hollow members have a circular cross section having an inner diameter of 0.5 cm or more and 5 cm or less.   The connecting member according to claim 2 or 3, wherein the resin molded product is made of a resin having a flexural modulus of 1 GPa or more.   A plurality of membrane modules, a water collection header, and a connection member that connects the plurality of membrane modules and the water collection header to form a flow path of the filtrate from each membrane module to the water collection header. A membrane module unit, wherein the member is a connecting member according to any one of claims 1 to 4. 6. The membrane module unit according to claim 5, wherein the membrane module is a hollow fiber membrane module in which a hollow fiber membrane bundle end portion is accommodated in a rectangular housing and is liquid-tightly fixed by a fixing member.

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