JP2009154101A - Filtration module, filtration module laminate, and filtration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent breakage of hollow fiber membranes and to efficiently clean without losing air by diffusion, while suppressing re-attachment of turbid matter stripped by cleaning by making it easily dischargeable from the periphery of the hollow fiber membranes. <P>SOLUTION: A filtration module 1 contains the hollow fiber membranes 7 in a vertically opened housing 4 having a pair of oppositely disposed end plates 2, and a pair of side plates 3 extended from both ends of the end plates 2 toward the facing direction of the end plates 2, the hollow fiber membranes 7 being stretched in the facing direction. The lower end side space of the pair of the side plate 3 is set larger than the upper end side space. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a filtration module in which a hollow fiber membrane is passed and accommodated in a housing whose upper and lower sides are opened, a filtration module laminate in which a plurality of the filtration modules are laminated, and a filtration device in which the filtration module laminate is installed It is about.

As such a filtration module, a membrane element in which a large number of hollow fiber membranes are bundled in a box-shaped casing having a rectangular parallelepiped shape whose upper and lower sides are opened, and a pair of opposite ends in the longitudinal direction of the casing. For example, Non-Patent Document 1 proposes a hollow fiber membrane that is accommodated by being attached to an end plate so as to be passed in the longitudinal direction. Furthermore, in this Non-Patent Document 1, the filtration modules are stacked and unitized in a multi-stage to increase the size and integration, and are immersed in a storage tank such as a settling basin of a water purification plant or a reservoir to perform filtration. In addition, it is also disclosed that the scrubbing air can be effectively used when air scrubbing is performed by an air diffuser installed below the filtration module.
Kashimada, Nakayama, Yodogawa, Matsuda "Development of large-capacity membrane filtration system using submerged membrane (I)", 55th National Waterworks Research Presentation Lecture, Japan Water Works Association, May 10, 2004, p. 182-183

  By the way, when such a filtration module of the same shape and the same size is laminated in a plurality of stages as described above to form a unit, the casing is a box-shaped box with a rectangular parallelepiped shape whose top and bottom are opened. When stacked, the lower edge of the upper casing is in close contact with the upper edge of the lower casing over the entire circumference.

  However, since the hollow fiber membrane accommodated in such a casing is passed with a certain degree of slack so that it can be swung at the time of washing with the air diffused from the diffuser tube, When the upper and lower peripheral edges of the casing are stacked so as to adhere to each other, in particular, the hollow fiber loosened in the upper filtration module between the upper and lower edges of the pair of side plates extending in the longitudinal direction to which the hollow fiber membrane is passed. There is a risk that the membrane may be bitten and damaged. The hollow fiber membrane can be bitten in addition to the case where the filtration modules are stacked in this way, for example, during maintenance such as replacement of the hollow fiber membrane, and the filtration module is pulled up from the settling tank and placed on the floor surface. Can also happen.

  In addition, when the casings of the plurality of filtration modules are configured so as to form a single cylinder by bringing the upper and lower peripheral edges into close contact with each other, the air diffused from the diffuser tube is difficult to leak out of the casing. While scrubbing air can be used effectively as described above, turbidity that has been peeled off from the hollow fiber membrane by washing with air is less likely to be discharged out of the casing. For example, the raw water in the water storage tank is discharged together with turbidity after washing. In such a case, the suspended matter may reattach to the hollow fiber membrane as the water level in the casing decreases.

  On the other hand, in order to prevent the hollow fiber membrane from biting when laminating a plurality of filtration modules as described above, and to prevent reattachment of turbidity after washing, a gap is provided between the casings. For example, in the case of laminating via a spacer or the like, the air diffused when the hollow fiber membrane is washed by the air diffuser leaks from the gap portion, so that the cleaning efficiency is particularly high in the upper filtration module. Is unavoidable.

  The present invention has been made under such a background, and can prevent the hollow fiber membrane from being damaged particularly when it is laminated in a plurality of stages or placed on the floor, and air due to aeration is allowed to escape. A filtration module that can be easily discharged from the periphery of the hollow fiber membrane to prevent re-adhesion, and a filtration layered with the filtration modules. It aims at providing the module laminated body and the filtration apparatus using this filtration module laminated body.

  In order to solve the above-described problems and achieve such an object, the filtration module of the present invention includes a pair of end plates arranged opposite to each other, and opposing ends facing each other from both side portions of these end plates. A filtration module in which a hollow fiber membrane is passed and accommodated in the opposite direction inside a housing having a pair of side plates extending in a direction and open at the top and bottom, wherein the distance between the pair of side plates is at the upper end The lower end side is expanded from the side.

  Further, the filtration module laminate of the present invention is a filtration module laminate in which a plurality of such filtration modules having the same shape and the same size of the above-mentioned housings are laminated one above the other, and a pair of the filtration filters adjacent to each other in the upper and lower sides. The module is laminated such that the upper end edge of the end plate in the housing of the lower filtration module is abutted against the lower end edge of the end plate in the housing of the upper filtration module, and the upper filtration The lower end edge of the pair of side plates in the housing of the module is disposed below the upper end edge of the pair of end plates in the housing of the lower filtration module. The filtration device has such a filtration module laminated body in a water tank or a reservoir in which raw water is held, or in the storage. It is installed in a casing into which the raw water is introduced by being immersed in a tank or a reservoir, and an air diffuser is disposed below the housing of the lowermost filtration module. .

  In the filtration module of the present invention, the interval between the pair of side plates extending in the facing direction in which the pair of end plates of the housing face each other is widened on the lower end side from the upper end side. In the filtration module laminate of the present invention in which such filtration modules are laminated, among these filtration modules, the upper edge of the side plate in the housing of the lower filtration module and the lower edge of the side plate in the housing of the upper filtration module Are not in close contact with each other, and the lower side edge of the upper side plate is spaced outward from the upper side edge of the lower side plate.

  Therefore, even if a certain amount of slack is imparted to the hollow fiber membrane passed in the opposite direction, the hollow fiber membrane can be prevented from being bitten by the upper and lower end edges of the housing side plates of the upper and lower filtration modules. The damage can be prevented. This also applies to the case where the housing is placed on the floor surface during maintenance of the filtration module, etc. Even if the lower end edge of such a housing is placed on the floor surface, While the lower end edge of the side plate is installed so that the interval between the side plates is wider than the upper end edge and protrudes to the side, the hollow fiber membrane is slacked vertically downward from the inner surfaces of the pair of end plates to the housing. The hollow fiber membrane is not bitten by the lower end edge.

  In addition, such a filtration module laminate is installed in a reservoir or reservoir in which raw water is retained, or in a casing in which the raw water is introduced by being immersed in the reservoir or reservoir. In the filtration device of the present invention in which the aeration means is disposed below the housing of the filtration module, the lower edge of the side plate of the upper housing protrudes outward from the upper edge of the side plate of the lower housing as described above. The air diffused from the air diffuser does not leak outside when rising from the upper opening of the lower filtration module to the upper filtration module.

  When the raw water in which the suspended matter separated from the hollow fiber membrane is suspended by the air diffused from the air diffuser is discharged from the water tank, the reservoir, or the casing, the raw water is reduced along with the lowering of the water level. And flows from the housing of each filtration module into the housing of the lower filtration module, and also from the above-mentioned space between the upper edge of the side plate of the lower housing and the lower edge of the side plate of the upper housing. Become. Therefore, it is possible to prevent re-deposition of turbidity on the hollow fiber membrane of the lower filtration module by preventing all raw water in which such turbidity has floated from flowing into the lower filtration module as it is. In addition, after discharging the dirty raw water, it is possible to supply new raw water into a water storage tank or the like to resume filtration.

  In the filtration module having the above configuration, in order to increase the distance between the pair of side plates from the upper end side to the lower end side as described above, for example, the pair of side plates are gradually laterally moved from the upper end edge toward the lower end edge. It is formed in the shape of a concave curve or convex curve that protrudes, or it is formed so as to extend straight downward on the upper edge side and gradually protrude toward the lower edge side, or conversely toward the lower edge on the upper edge side. It may be formed so as to incline to the side and extend straight on the lower edge side, but in these cases, the side plate must be bent in this way.

  Therefore, it is desirable that the distance between the pair of side plates be gradually increased to both sides at a constant rate from the upper end side toward the lower end side, so that the side plate is flat from the upper end side to the lower end side. It is sufficient that the filter module is disposed so as to be inclined, and the housing of the filtration module can be easily formed.

  In addition, a recess that is recessed toward the upper edge is formed at the center in the width direction of the lower edge of the end plate, and the width of the bottom edge on the upper edge side of the recess is larger than the width of the upper edge of the end plate. The upper end edge of the end plate in the housing of the lower filtration module as in the filtration module laminate is formed by making the upper end edge of the end plate and the recess of the lower end edge engageable with each other. When the upper filter module housing is laminated to the lower end edge of the end plate, the upper end edge of the lower filter module end plate is inserted into the recess of the lower end edge of the upper end filter module. Can be engaged.

  Therefore, for example, if both side edges of the side plate are connected to both side edges of the end plate so that the upper and lower ends of the side plate coincide with the upper and lower ends of the end plate, the pair of the housings of the upper filtration module in this engaged state. The lower edge of the side plate is disposed below the upper edge of the pair of end plates in the housing of the lower filtration module as described above, and the pair of the upper filtration modules having a larger interval is disposed. Since it is inserted between the side plates, it is possible to prevent air leakage from the air diffuser more reliably. Moreover, the pair of end plates is formed with the above-mentioned recess at the center of the lower end edge, so that both ends of the lower end edge form downward projecting legs. Can be placed in contact with the floor as it is, so that maintainability can be improved.

  As described above, according to the filtration module, the filtration module laminate, and the filtration apparatus of the present invention, when the filtration module is placed alone on the floor surface during maintenance or the like, a plurality of filtration modules are laminated. Thus, when the filtration module laminate is configured, it is possible to prevent a situation in which the hollow fiber membrane is caught and damaged. In addition, when the hollow fiber membrane is washed by aeration after filtering the raw water as a laminate, efficient cleaning is achieved by raising it to the upper filtration module without escaping the air due to the aeration. On the other hand, when discharging the raw water from which the turbidity has been separated from the hollow fiber membrane by washing, it is possible to prevent the turbidity from reattaching to the hollow fiber membrane of the lower filtration module, and to filter the new raw water. Can be performed efficiently.

  FIGS. 1 to 4 show an embodiment of the filtration module of the present invention, and FIGS. 5 to 8 show a book in which a plurality of (two) filtration modules of the same shape and size are stacked one above the other. FIG. 9 thru | or FIG. 12 shows one Embodiment of the filtration module laminated body of invention, and the filtration module laminated body of other embodiment which laminated | stacked the same filtration module up and down is used for the water storage tank by which raw | natural water is hold | maintained. 1 shows an embodiment of the immersed filtration device of the present invention. 9 to 12 also show, for comparison, a filtration module laminate in which conventional filtration modules as described in Non-Patent Document 1 are laminated one above the other.

  As shown in FIGS. 1 and 2, the filtration module 1 of the present embodiment has a substantially isosceles trapezoidal flat plate shape and a pair of end plates 2 arranged opposite to each other in parallel, and both sides of these end plates 2. The top and bottom constituted by the edge 2A, that is, a pair of side plates 3 connected to the oblique side of the isosceles trapezoid formed by the end plate 2 and extending perpendicularly to the end plates 2 in the opposing direction in which both end plates 2 face each other are opened A housing 4 is provided. The end plate 2 and the side plate 3 constituting the housing 4 are made of, for example, ABS resin.

  The end plate 2 has an upper edge 2B with the short upper base of the isosceles trapezoidal length on the upper side, and a lower edge 2C with the long lower bottom on the lower side. Is gradually widened at a constant rate from the upper edge 2B side toward the lower edge 2C side. In addition, the lower end edge 2C of the end plate 2 is formed with a recess 5 that is recessed toward the upper end edge 2B side at the center thereof. The recess 5 is formed by cutting out the central portion of the lower end edge 2C into an isosceles trapezoidal shape, and includes a bottom edge 5A parallel to the upper and lower end edges 2B and 2C, and the bottom edge 5A. And a pair of inner edges 5B extending parallel to both side edges 2A of the end plate 2 toward the lower end edge 2C.

  The length of the bottom edge 5A is slightly longer than the length of the upper edge 2B of the end plate 2. The depth of the recess 5 from the lower edge 2C to the bottom edge 5A is, for example, from the upper edge 2B to the bottom edge. The length up to 5A is substantially the same as the length of the upper edge 2B, and the upper edge 2B can be engaged with the recess 5 of the lower edge 2C. In addition, by forming such a recess 5, a pair of leg portions 6 that protrude relatively downward is formed on both ends of the lower end edge 2 </ b> C of the end plate 2.

  The side plate 3 has a rectangular flat plate shape having a length equal to the side edge 2A of the end plate 2 including the leg portion 6 and a width in the opposite direction that is larger than the length. Or by being bolted to a not-shown plate piece or the like that is integrally formed so as to be bent perpendicularly from the side edge 2A to the end plate 2 or, in some cases, integrally formed with the end plate 2, The side plate 3 is connected to the side edge 2A in an inclined manner so as to project laterally from the upper end edge 3A toward the lower end edge 3B. Therefore, the interval between the pair of side plates 3 (interval in the width direction (left and right direction in each figure) of the end plate 2) gradually increases at a constant rate from the upper end edge 3A toward the lower end edge 3B. The upper end edge 2B of the end plate 2 and the upper end edge 3A of the side plate 3, and the lower end edge 2C of the leg portion 6 of the end plate 2 and the lower end edge 3B of the side plate 3 are the same with their upper and lower ends aligned with each other. It is located on a plane.

  Furthermore, the hollow fiber membrane 7 is accommodated in the housing 4 configured in this manner so as to be passed in the above-mentioned facing direction. The hollow fiber membrane 7 includes, for example, a plurality of sheet-like elements arranged in the vertical direction arranged in parallel in the width direction of the end plate 2 (left and right in each drawing) to form a membrane element 7A, and both end portions thereof are ends. The plate 2 is connected and fixed to headers 7B attached to the mutually facing inner surfaces. In this embodiment, there are four such membrane elements 7A, and the header 7B is positioned between the upper edge 2B of the end plate 2 and the bottom edge 5A of the recess 5, and is viewed in the opposite direction. They are arranged in a lattice pattern.

  When the filtration module 1 configured as described above is placed on the floor G as shown in FIG. 3 for maintenance or the like, the lower end edge 2C of the end plate 2 in the leg portion 6; The lower end edge 3B of the side plate 3 connected to the side edge 2A of the leg portion 6 is grounded, and the hollow fiber membrane 7 accommodated therein is supported. Therefore, even if a certain amount of slack is given to the hollow fiber membrane 7, the hollow fiber membrane 7 does not contact the floor surface G at both ends fixed to the end plate 2, and the hollow fiber membrane 7 at the central portion. 3B, the lower end edge 3B of the side plate 3 protrudes laterally as shown in FIGS. 3 and 4, so that a large gap is provided between the pair of side plates 3. The hollow fiber membrane 7 is not caught between the edge 3B and the floor surface G.

  Further, the end plate 2 is formed with a recess 5 at the center of the lower end edge 2C, and the leg portions 6 are formed at both ends relatively to this, and the filtration module 1 is mounted on the floor G. In the placed state, a space by the recess 5 is opened between the end plate 2 and the floor G as shown in FIG. Therefore, maintenance of the headers 7B at both ends of the lower membrane element 7A can be performed without removing all the membrane elements 7A of the accommodated hollow fiber membrane 7 through this space. It is also possible to improve the performance.

  On the other hand, in the filtration module laminated body of the present embodiment in which a plurality of such filtration modules 1 are laminated, the upper end edge 2 of the end plate 2 of the lower filtration module 1 is arranged in the upper filtration module 1 as shown in FIGS. The end plate 2 is abutted against the center of the lower end edge 2C, and more specifically, inserted into the recess 5 formed at the center of the lower end edge 2C, and the lower end plate 2 is inserted into the bottom edge 5A of the recess 5 The upper edges 2B of the two are brought into close contact with each other, and the housings 4 are integrated. In order to integrate the housings 4 in this way, for example, a plate piece portion (not shown) that is integrally formed so as to be bent perpendicularly to the end plate 2 at the bottom edge 5A and the upper end edge 2B that are brought into close contact with each other. Each plate piece portion may be formed and fastened by bolting or the like.

  In the filtration module laminate configured as described above, the hollow fiber membrane 7 is passed in the opposite direction of the end plate 2 and both ends thereof are supported by the end plate 2, so that the upper filtration module 1 that is in close contact with each other. The hollow fiber membrane 7 is not caught between the bottom edge 5A of the recess 5 of the end plate 2 in the housing 4 and the upper end edge 2B of the end plate 2 in the housing 4 of the lower filtration module 1. Further, in the side plates 3 in the housing 4 of the upper and lower filtration modules 1, the lower edge 3B of the upper side plate 3 is located below the upper edge 3A of the lower side plate 3 as shown in FIG. Since the upper and lower end edges 3A and 3B are not in close contact with each other, even if the hollow fiber membrane 7 is slackened, the hollow fiber membrane 7 may be bitten out of the upper end edge 3A. There is nothing wrong.

  Therefore, according to the filtration module 1 having the above-described configuration and the filtration module laminate in which a plurality of the filtration modules are laminated, when the filtration module 1 is configured by laminating a plurality of filtration modules 1 during the maintenance of the filtration module 1 as described above. It is possible to prevent the hollow fiber membrane 7 from being damaged due to biting. For this reason, not only can the cost be reduced, but also the labor of maintenance is increased, or the hollow fiber membrane 7 is not caught when assembling the filtration module laminate by laminating the plurality of filtration modules 1. Thus, it is possible to avoid the need to pay close attention.

  Furthermore, in the filtration device in which such a filtration module laminate is immersed in the water storage tank 11 in which the raw water W is held as shown on the right side of FIGS. 9 to 12, the filtration is laminated as shown in FIG. Below the lowermost filtration module 1 of the modules 1, for example, an air diffuser 12 made of one or a plurality of air diffusers or sintered tubes having a number of downwardly opening air holes is disposed. A filtration water pipe (not shown) is connected to each of the filtration modules 1 of the filtration module laminate so immersed in the header 7B of the membrane element 7A, and the filtered water obtained by filtering the raw water W through the hollow fiber membrane 7 is It is discharged through this filtered water pipe.

  Further, the left side of FIGS. 9 to 12 shows a conventional box-shaped housing (casing) 21 having a rectangular parallelepiped shape in which the upper and lower sides are opened as described above, and a hollow fiber membrane in the inside thereof. 9. A filtration module laminate in which a plurality of filtration modules 23 in which membrane elements 22 are housed are laminated. As shown in FIG. 9, the upper and lower filtration modules 23 are fixed with the upper and lower edges of the housing 21 being in close contact with each other. Therefore, the housing 21 as a whole has a rectangular prism shape extending vertically. Also, an air diffuser 24 is disposed below the lowermost filtration module 23.

  After the raw water W is filtered by such a filtration module laminate in which a plurality of conventional filtration modules 23 are laminated, air is diffused from the aeration means 24 to clean the membrane element 22. 10 rises without escaping out of the housing 21 as indicated by the white arrow on the left side of FIG. 10, but even if raw water W tries to flow into the housing 21 as the air rises, a black arrow appears on the lower left side of FIG. As indicated by the line, the inlet is only the lower opening of the housing 21 in the lowermost filtration module 23. Therefore, the suspended matter separated from the hollow fiber membrane surface of the membrane element 22 by air scrubbing is sufficiently removed from the housing 21. Can not be discharged.

  On the other hand, in the filtration device of the present embodiment, when the raw water W in the housing 4 in each filtration module 1 of the filtration module laminate rises as the air diffused from the air diffusion means 12 rises, it is drawn into this. As shown by the black arrow line on the right side of FIG. 10, the raw water W outside the housing 4 is mixed with the upper edge 3 </ b> A of the side plate 3 in the stacked lower housing 4 and the lower edge of the side plate 3 in the upper housing 4. Since it individually flows into the housing 4 of the upper filtration module 1 from the gap with 3B, the turbidity separated by the air scrubbing can be discharged out of the housing 4 reliably and efficiently.

  In addition, after cleaning the air diffusers 12 and 24 by air scrubbing, the raw water W in the water tank 11 in which the separated turbidity has floated is placed at the bottom of the water tank 11 as shown in FIGS. 11 and 12, for example. In the case of once draining from the provided drainage port 11A and then introducing new raw water W into the water storage tank 11 for filtration, the filtration apparatus in which the filtration module laminate of the conventional filtration module 23 is immersed is shown in FIG. As shown in the left side of FIG. 12, as the water level of the raw water W in the water storage tank 11 decreases, the raw water W in the stacked housings 21 passes through the housings 21 as they are, and the housing 21 in the lowermost filtration module 23 It is only discharged from the lower opening. That is, as described above, the raw water W with turbidity that has not been sufficiently discharged out of the housing 21 is drained through the housing 21 as it is, so that the turbidity is reattached to the hollow fiber membrane of the membrane element 22. Thus, when new raw water W is introduced and filtration is resumed, the filtration efficiency is impaired.

  However, in this embodiment as well, as shown by the black arrow line on the right side of FIGS. 11 and 12, the raw water W in the water tank 11 is discharged from each housing 4 of the filtration module laminate as the water level decreases. In addition to flowing into the housing 4 of the lower filtration module 1, the raw water W to be generated is from a gap portion between the upper and lower edges 3 </ b> A and 3 </ b> B of the side plates 3 in the housing 4 of the upper and lower filtration modules 1. It is also discharged out of the housing 4. Therefore, in combination with the fact that the turbidity can be discharged out of the housing 4 during the cleaning by air scrubbing, according to the filtration device of this embodiment, the turbidity is generated when the raw water W in the water storage tank 11 is discharged in this way. It is possible to prevent reattachment to the hollow fiber membrane 7, and filtration can be resumed with high efficiency even when new raw water W is introduced into the water storage tank 11.

  In addition, in the filtration apparatus of embodiment shown in these FIG. 9 thru | or FIG. 12, the case where the filtration module laminated body of embodiment shown in FIG. 5 thru | or FIG. 8 is immersed in the water storage tank 11 which provided the drain outlet 11A in the bottom part. However, for example, a drain pipe may be inserted into the tank and opened at the bottom, and the filtration module laminate of the above embodiment is immersed in such a reservoir, and the lowermost filtration is performed. The air diffuser 12 may be disposed below the module 1.

  Further, instead of directly immersing the filtration module laminate in the raw water W held in the water tank 11 or the reservoir in this way, the inventor of the present invention proposes, for example, in Japanese Patent Application Laid-Open No. 2005-046698. The filtration module laminate and the aeration means 12 of the above embodiment are accommodated in a bottomed cylindrical casing immersed in a reservoir or reservoir in which raw water is retained, and the reservoir or reservoir is contained in this casing. You may make it filter by introduce | transducing raw | natural water.

It is a perspective view which shows one Embodiment of the filtration module of this invention. It is a disassembled perspective view which shows the state which removed the side plate 3 of embodiment shown in FIG. It is sectional drawing orthogonal to the opposing direction of a pair of end plate 2 which shows the end plate 2 and membrane element 7A of embodiment shown in FIG. It is sectional drawing orthogonal to the opposing direction of a pair of end plate 2 which shows the side plate 3 and membrane element 7A of embodiment shown in FIG. It is a perspective view which shows one Embodiment of the filtration module laminated body of this invention. It is a disassembled perspective view which shows the state which removed the side plate 3 of the filtration module 1 of the upper stage of embodiment shown in FIG. It is sectional drawing orthogonal to the opposing direction of a pair of end plate 2 which shows the end plate 2 and membrane element 7A of embodiment shown in FIG. It is sectional drawing orthogonal to the opposing direction of a pair of end plate 2 which shows the side plate 3 and membrane element 7A of embodiment shown in FIG. Sectional drawing orthogonal to the opposing direction of a pair of end plate 2 which shows side plate 3 and membrane element 7A, 22 of one Embodiment (right side) of the filtration apparatus of this invention, and the filtration apparatus (left side) by the conventional filtration module 23 It is. FIG. 10 is a cross-sectional view showing a state in which the membrane elements 7A and 22 are cleaned in the filtration device shown in FIG. It is sectional drawing which shows the state which begins to discharge | emit the raw water W in the water storage tank 11 in the filtration apparatus shown in FIG. It is sectional drawing which shows the state which is discharging | emitting the raw water W in the water storage tank 11 in the filtration apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration module 2 End plate 2B Upper end edge of end plate 2 2C Lower end edge of end plate 2 3 Side plate 3A Upper end edge of side plate 3 3B Lower end edge of side plate 3 4 Housing 5 Recess 5A Bottom edge of recess 5 6 Leg 7 Hollow fiber membrane 7A Membrane element 7B Header 11 Water tank 11A Drain port W Raw water

Claims (6)

  A pair of end plates opposed to each other and a pair of side plates extending in opposite directions facing the end plates from both side portions of these end plates are disposed in the opposite direction inside the housing opened up and down. A filtration module in which a hollow fiber membrane is passed and accommodated, wherein a gap between the pair of side plates is wider on a lower end side than an upper end side.   2. The filtration module according to claim 1, wherein an interval between the pair of side plates is gradually expanded on both sides at a constant rate from the upper end side toward the lower end side.   A recess that is recessed toward the upper edge is formed at the center in the width direction of the lower edge of the end plate, and the width of the bottom edge on the upper edge side of the recess is made larger than the width of the upper edge of the end plate. The filtration module according to claim 1, wherein an upper end edge of the end plate and a recess of the lower end edge are configured to be engageable with each other.   A plurality of filtration modules according to any one of claims 1 to 3 having the same shape and the same size of the housing, wherein the filtration modules are stacked one above the other, and a pair of adjacent ones above and below The filtration module is characterized in that the upper edge of the end plate in the housing of the lower filtration module is laminated so as to abut on the lower edge of the end plate in the housing of the upper filtration module. Filtration module laminate.   A plurality of filtration modules according to any one of claims 1 to 3 having the same shape and the same size of the housing, wherein the filtration modules are stacked one above the other, and a pair of adjacent ones above and below The filtration module is characterized in that lower end edges of the pair of side plates in the housing of the upper filtration module are disposed below upper end edges of the pair of side plates in the housing of the lower filtration module. Filtration module laminate.   The filtration module laminate according to claim 4 or 5 is installed in a water tank or a reservoir in which raw water is held, or in a casing in which the raw water is introduced by being immersed in the water tank or the reservoir. And a diffuser is disposed below the housing of the lowermost filtration module.

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