WO2018092342A1

WO2018092342A1 - Filtration module and filtration device

Info

Publication number: WO2018092342A1
Application number: PCT/JP2017/022457
Authority: WO
Inventors: 育田中
Original assignee: 住友電気工業株式会社
Priority date: 2016-11-15
Filing date: 2017-06-19
Publication date: 2018-05-24
Also published as: CN109562326A; JPWO2018092342A1

Abstract

Provided is a filtration module which is equipped with multiple hollow fiber membranes and a pair of holding members for fixing the upper and lower ends of the hollow fiber membranes, and in which at least one of the pair of holding members has a filtrate water channel therein, wherein the filtrate water channel partitions off the multiple hollow fiber membranes in the longitudinal direction of the holding members, and is equipped with: multiple first water collection parts that are respectively connected with open ends of the partitioned hollow fiber membranes; and a second water collection part that is connected with the multiple first water collection parts and has a discharge port for discharging filtrate water from at least one lateral end of the holding members.

Description

Filtration module and filtration device

The present invention relates to a filtration module and a filtration device.
This application claims priority based on Japanese Patent Application No. 2016-222157 filed on November 15, 2016, and incorporates all the description content described in the above Japanese application.

Conventionally, as a solid-liquid separation processing apparatus in a manufacturing process such as sewage treatment and medicine, it has a plurality of hollow fiber membranes aligned in the vertical direction, and the upper and lower ends of the plurality of hollow fiber membranes are formed by a pair of holding members. A filtration apparatus including a filtration module having a substantially rectangular shape in plan view is used (see JP 2013-56346 A). In this filtration device, one filtration module is singly or a plurality of filtration modules are immersed in the liquid to be treated at regular intervals. This filtration apparatus performs filtration by preventing permeation of impurities contained in the liquid to be treated by the hollow fiber membrane surface and allowing other impurities to permeate into the hollow fiber membrane.

JP 2013-56346 A

A filtration module according to an aspect of the present invention includes a plurality of hollow fiber membranes that are aligned in a vertical direction and arranged in a curtain shape, and a pair of holding members that fix the upper and lower ends of these hollow fiber membranes. , At least one of the pair of holding members is an external pressure type or immersion type filtration module having a filtration water channel for discharging filtrate filtered by the hollow fiber membrane, wherein the filtration water channel is the plurality of hollow Dividing the yarn membrane in the longitudinal direction of the holding member, communicating with the plurality of first water collecting portions where the open ends of the plurality of divided hollow fiber membranes communicate with each other, and communicating with the plurality of first water collecting portions, And a second water collecting part having a discharge port for discharging filtrate from at least one side end of the holding member.

It is a typical perspective view showing the filtration module concerning one embodiment of the present invention. It is a typical side view of the filtration module of FIG. It is typical front sectional drawing of the filtration module of FIG. FIG. 2 is a cross-sectional view taken along line AA showing a communication hole of an upper holding member of the filtration module of FIG. It is typical sectional drawing which shows the modification of the communicating hole of FIG. It is a typical perspective view which shows the filtration module which concerns on embodiment different from the filtration module of FIG. It is typical front sectional drawing of the filtration module of FIG. It is a typical front view which shows a filtration apparatus provided with the filtration module of FIG. It is a typical side view of the filtration apparatus of FIG.

[Problems to be solved by the present disclosure]
Today, in a filtration device or the like used for recycling sewage, an increase in the size of a filtration module is being promoted in order to increase the production amount of filtered water. In such a filtration apparatus, a plurality of filtration modules are arranged in two rows while being fixed by a frame, and a flow path in which filtered water that has permeated through the hollow fiber membrane is formed in one holding member of the filtration module It is considered that the gas is discharged from a discharge port formed at one end in the longitudinal direction of the holding member.

However, in such a filtration module that discharges filtered water that has passed through the hollow fiber membrane from one end in the longitudinal direction of the holding member, the filtration amount of the hollow fiber membrane that is connected to the filtrate water outlet side of the holding member However, it tends to be larger than the filtration amount of the hollow fiber membrane connected to the opposite side of the discharge port. Therefore, in this filtration module, since the amount of filtration of a plurality of hollow fiber membranes varies, it is difficult to sufficiently increase the production efficiency of filtered water.

Based on such circumstances, an object of the present invention is to provide a filtration module and a filtration device that can make the filtration amount of a plurality of hollow fiber membranes uniform and increase the production efficiency of filtrate water.

[Effects of the present disclosure]
According to the present disclosure, the filtration module and the filtration device can achieve uniform filtration amount of the plurality of hollow fiber membranes and increase the production efficiency of filtrate water.

[Description of Embodiment of the Present Invention]
First, embodiments of the present invention will be listed and described.

A filtration module according to an aspect of the present invention includes a plurality of hollow fiber membranes that are aligned in a vertical direction and arranged in a curtain shape, and a pair of holding members that fix the upper and lower ends of these hollow fiber membranes. , At least one of the pair of holding members is an external pressure type or immersion type filtration module having a filtration water channel for discharging filtrate filtered by the hollow fiber membrane, wherein the filtration water channel is the plurality of hollow Dividing the yarn membrane in the longitudinal direction of the holding member, communicating with the plurality of first water collecting portions where the open ends of the plurality of divided hollow fiber membranes communicate with each other, and communicating with the plurality of first water collecting portions, And a second water collection part having a discharge port for discharging filtrate from at least one side end of the holding member.

In the filtration module, at least one of the pair of holding members has a filtration channel for discharging the filtrate filtered by the hollow fiber membrane inside, so that the filtered water that has permeated through the plurality of hollow fiber membranes is passed through the filtration channel. Can be discharged through. In the filtration module, the filtration channel separates the plurality of hollow fiber membranes in the longitudinal direction of the holding member, and a plurality of first water collecting portions communicated with the open ends of the plurality of divided hollow fiber membranes, respectively. And a second water collecting portion that communicates with the plurality of first water collecting portions and has a discharge port for discharging filtered water from at least one side end portion of the holding member. The amount of filtration can be made uniform, and the production efficiency of filtered water can be increased.

The communication holes of the plurality of first water collecting portions communicating with the second water collecting portion may be formed in the central portion of the first water collecting portion in the longitudinal direction of the holding member. The communication holes of the plurality of first water collection portions communicating with the second water collection portion are formed in the central portion of the first water collection portion in the longitudinal direction of the holding member, whereby each first water collection portion The filtration amount of the plurality of hollow fiber membranes communicating with the portion can be easily made uniform, and the filtration amount of the plurality of hollow fiber membranes in the entire filtration module can be promoted.

The average length of the first water collecting part in the longitudinal direction of the holding member is preferably 50 mm or more and 400 mm or less, and the number of the first water collecting parts is preferably 2 or more and 8 or less. When the average length of the first water collecting part in the longitudinal direction of the holding member and the number of the first water collecting parts are within the above range, a plurality of hollow fiber membranes communicating with each first water collecting part It is possible to promote uniformization of the filtration amount and sufficiently increase the filtration amount of the entire filtration module.

Each of the pair of holding members may include the plurality of first water collecting portions and second water collecting portions. Since each of the pair of holding members has the plurality of first and second water collecting portions, the filtration efficiency can be further increased.

The filtration device according to one embodiment of the present invention includes a plurality of the filtration modules and a water tank that houses the plurality of the filtration modules.

Since the filtration device includes a plurality of the filtration modules, the filtration amount of the plurality of hollow fiber membranes can be made uniform as described above, and the production efficiency of filtered water can be increased.

In the present specification, “upper” means “upper” in the usage state of the filtration module of the present invention (a state immersed in the liquid to be treated), and “lower” means the opposite. “A plurality of hollow fiber membranes are arranged in a curtain shape” means that an existing region of a plurality of hollow fiber membranes has a long axis in a cross section perpendicular to the vertical direction.

[Details of the embodiment of the present invention]
Hereinafter, a filtration module and a filtration device according to an embodiment of the present invention will be described with reference to the drawings.

[First embodiment]
<Filtration module>
The filtration module 1 in FIG. 1 is arranged in a vertical direction (Z direction) and arranged in a curtain shape, a plurality of hollow fiber membranes 2, an upper holding member 3 that fixes the upper ends of these hollow fiber membranes 2, The lower holding member 4 which fixes the lower end of these hollow fiber membranes 2 is provided. As shown in FIG. 3, the filtration module 1 includes a filtration water channel 5 through which the upper holding member 3 out of the upper holding member 3 and the lower holding member 4 discharges filtered water filtered by the hollow fiber membrane 2. It has an external pressure type or immersion type filtration module. The “external pressure type” means a system in which the outer peripheral surface side of the hollow fiber membrane is set to a high pressure and the liquid to be treated is transmitted to the inner peripheral surface side of the hollow fiber membrane. In addition, the “immersion type” refers to a system in which the inner peripheral surface side of the hollow fiber membrane is set to a negative pressure and the liquid to be treated is transmitted to the inner peripheral surface side. The “immersion type” is also called “suction type”.

As shown in FIG. 3, the filtration water channel 5 divides a plurality of hollow fiber membranes 2 in the longitudinal direction of the upper holding member 3, and a plurality of divided open ends of the hollow fiber membranes 2 communicate with each other. The 1st water collecting part 5a and the 2nd water collecting part 5b which has the discharge port 5c which is connected to the some 1st water collecting part 5a and discharges filtered water from the one side edge part of the upper side holding member 3 are provided.

In the filtration module 1, the upper holding member 3 has a filtered water channel 5 for discharging the filtered water filtered by the hollow fiber membrane 2 inside, so that the filtered water that has permeated through the plurality of hollow fiber membranes 2 is passed through this filtered water channel. 5 can be discharged. In the filtration module 1, the filtration channel 5 divides the plurality of hollow fiber membranes 2 in the longitudinal direction of the upper holding member 3, and the plurality of first ends of the divided hollow fiber membranes 2 communicate with each other. Since it includes a first water collecting portion 5a and a second water collecting portion 5b having a discharge port 5c that communicates with the plurality of first water collecting portions 5a and discharges filtered water from one end of the upper holding member 3. The amount of filtration of the plurality of hollow fiber membranes 2 can be made uniform, and the production efficiency of filtered water can be increased. That is, when the plurality of hollow fiber membranes 2 communicates directly with the second water collection part 5b, the suction pressure of filtered water is likely to be applied to the hollow fiber membrane 2 communicated with the discharge port 5c side of the second water collection part 5b. While the amount of filtration of the hollow fiber membrane 2 communicating with the discharge port 5c side of the second water collecting portion 5b increases, the amount of filtration of the hollow fiber membrane 2 communicating with the opposite side of the discharge port 5c of the second water collection portion 5b is large. It is thought that it will decrease. On the other hand, the filtration module 1 has a plurality of hollow fiber membranes 2 communicating with the plurality of first water collecting portions 5a, so that the filtration amount of the plurality of hollow fiber membranes 2 due to the suction pressure is reduced. It is considered that variation can be suppressed, and thereby the filtration efficiency of the plurality of hollow fiber membranes 2 can be increased.

(Upper holding member)
As shown in FIGS. 1 and 2, the upper holding member 3 is formed in a rod shape whose longitudinal direction is the longitudinal direction (X direction) in the horizontal direction of a bundle of a plurality of hollow fiber membranes 2. Further, the upper holding member 3 is formed in a substantially rectangular parallelepiped shape. The upper holding member 3 has an upper surface and a lower surface parallel to the horizontal direction, and a plurality of hollow fiber membranes 2 are connected to the lower surface. The upper holding member 3 has a main body 3a to which a plurality of hollow fiber membranes 2 are connected on the lower surface, and a drain nozzle 3b that protrudes outward in the longitudinal direction from one longitudinal end of the main body 3a. The opening of the nozzle 3b forms a discharge port 5c. The upper holding member 3 is hermetically sealed except for the communication portion with the plurality of hollow fiber membranes 2 and the discharge port 5c. The upper holding member 3 has a pair of concave grooves 3c extending in the longitudinal direction on the pair of side surfaces. The pair of concave grooves 3 c are formed at positions facing the horizontal direction of the pair of side surfaces of the upper holding member 3. The “bar shape” refers to an elongated shape.

The lower limit of the average length in the longitudinal direction of the main body 3a is preferably 0.4 m, and more preferably 0.7 m. As an upper limit of the longitudinal direction average length of the main body 3a, 1.5 m is preferable and 1.2 m is more preferable. If the average length in the longitudinal direction of the main body 3a is less than the lower limit, it may be difficult to apply the filtration module 1 to a large filtration device. If the average length in the longitudinal direction of the main body 3a exceeds the above upper limit, the handleability may be lowered. On the other hand, when the average length in the longitudinal direction of the main body 3a is within the above range, the effect of improving the filtration efficiency by the plurality of first water collecting portions 5a can be suppressed while suppressing a decrease in the handleability of the filtration module 1. Can fully demonstrate.

The lower limit of the average width of the main body 3a (the length in the direction perpendicular to the longitudinal direction of the main body 3a) is preferably 30 mm, more preferably 40 mm. The upper limit of the average width of the main body 3a is preferably 100 mm, and more preferably 70 mm. If the average width of the main body 3a is less than the lower limit, the filtration amount of the filtration module 1 may not be sufficiently increased. When the average width of the main body 3a exceeds the above upper limit, the handleability of the filtration module 1 may be lowered, and the hollow fiber membrane located in the center in the width direction (Y direction) may be difficult to clean.

(Filtration channel)
The filtered water channel 5 is formed inside the main body 3 a of the upper holding member 3. The filtered water channel 5 has a plurality of first water collecting portions 5a and one second water collecting portion 5b. Moreover, the 2nd water collection part 5b is located above the some 1st water collection part 5a. That is, the plurality of first water collection parts 5a are communicated with the plurality of hollow fiber membranes 2 at the lower side and the second water collection part 5b on the opposite side to the side communicated with the plurality of hollow fiber membranes 2. Communicate.

<First water collecting part>
The plurality of first water collecting portions 5a are each formed in a substantially rectangular parallelepiped shape in which the longitudinal direction of the upper holding member 3 is the longitudinal direction. The plurality of first water collecting portions 5a are disposed across the longitudinal ends of the second water collecting portion 5b below the second water collecting portion 5b. The average length in the longitudinal direction of the plurality of first water collecting portions 5a is preferably equal. Moreover, it is preferable that the average width | variety of the some 1st water collection part 5a is equal to the average width | variety of the 2nd water collection part 5b.

The lower limit of the average length in the longitudinal direction of the first water collecting portion 5a is preferably 50 mm, and more preferably 80 mm. As an upper limit of the average length of the longitudinal direction of the 1st water collection part 5a, 400 mm is preferable and 200 mm is more preferable. If the average length is less than the lower limit, the longitudinal length of the first water collecting portion 5a becomes unnecessarily small. As a result, the number of the first water collecting portions 5a increases, and these first water collecting portions There is a possibility that the amount of filtration of the plurality of hollow fiber membranes 2 between 5a may vary. If the average length exceeds the upper limit, there may be variations in the filtration efficiency of the plurality of hollow fiber membranes 2 in each first water collecting portion 5a.

As a minimum of the number of the 1st water collection parts 5a in upper

part holding member

3, 2 is preferred and 3 is more preferred. As an upper limit of the number of the 1st water collection parts 5a in the upper side holding member 3, 8 is preferable and 7 is more preferable. If the number is less than the lower limit, the length in the longitudinal direction of each first water collecting portion 5a becomes too long, and the amount of filtration of the plurality of hollow fiber membranes 2 in each first water collecting portion 5a varies. May occur. When the number exceeds the upper limit, there is a possibility that the filtration amount of the plurality of hollow fiber membranes 2 between the plurality of first water collecting portions 5a may vary.

Moreover, it is preferable that the said filtration module 1 has both the average length of the 1st water collection part 5a in the longitudinal direction, and the number of the 1st water collection parts 5a in the said range. The filtration module 1 has a plurality of communicating with each first water collecting portion 5a by the average length in the longitudinal direction of the first water collecting portion 5a and the number of the first water collecting portions 5a being within the above range. The filtration amount of the entire filtration module 1 can be sufficiently increased while promoting the homogenization of the filtration amount of the hollow fiber membrane 2 of the book.

The lower limit of the number of hollow fiber membranes 2 communicated with each first water collecting portion 5a is preferably 150, and more preferably 200. The upper limit of the number is preferably 3000 and more preferably 2500. If the number is less than the lower limit, the amount of filtration of each first water collecting portion 5a becomes insufficient, and as a result, the amount of filtration of the filtration module 1 may not be sufficiently increased. When the number exceeds the above upper limit, there is a possibility that the amount of filtration of the plurality of hollow fiber membranes 2 in each first water collecting portion 5a is likely to vary.

Also, the lower limit of the total number of the plurality of hollow fiber membranes 2 communicating with the upper holding member 3 is preferably 1000, and more preferably 1500. The upper limit of the total number is preferably 6000, more preferably 5000, and further preferably 4500. If the total number is less than the lower limit, the filtration amount of the filtration module 1 may not be sufficiently increased. When the total number exceeds the above upper limit, there is a possibility that the filtration amount of the plurality of hollow fiber membranes 2 is likely to vary.

The first water collecting portion 5a preferably has a communication hole 5d on the side opposite to the side communicating with the plurality of hollow fiber membranes 2. The 1st water collection part 5a and the 2nd water collection part 5b are connected by this communication hole 5d. The upper limit of the number of communication holes 5d formed in each first water collecting portion 5a is preferably 3, more preferably 2, and even more preferably 1. When a plurality of communication holes 5d are formed in one first water collecting portion 5a, these communication holes 5d are preferably formed at equal intervals. In particular, in the filtration module 1, each first water collecting portion 5a has one communication hole 5d, and the communication holes 5d of the plurality of first water collecting portions 5a are arranged in the longitudinal direction of the first water collecting portion 5a. It is preferable that it is formed at the center. Thereby, the said filtration module 1 is easy to aim at equalization of the filtration amount of the several hollow fiber membrane 2 connected to each 1st water collection part 5a, and the plurality of hollow fiber membranes 2 in the said filtration module 1 whole are made. Uniformity of the filtration amount can be promoted. In addition, it is preferable that the communication hole 5d is formed in the center part of the width direction of the 1st water collection part 5a.

The shape of the communication hole 5d is not particularly limited, and examples thereof include a circle, an ellipse, a triangle, and a polygon. Among these, the shape of the communication hole 5d is preferably circular. Further, as the diameter of the communication hole 5d, as long as the filtered water introduced into the first water collecting portion 5a can be discharged to the second water collecting portion 5b while suppressing variation in the filtration amount in the plurality of hollow fiber membranes 2, It is not limited, For example, it is 1 mm or more and 50 mm or less. The “diameter of the communication hole 5d” refers to the diameter of a perfect circle having an area equal to the area of the communication hole 5d.

As shown in FIG. 4, the communication holes 5d of the plurality of first water collecting portions 5a may have the same diameter. When the communication holes 5d of the plurality of first water collection parts 5a have the same diameter as described above, the filtration module 1 is configured to receive the second collection from each first water collection part 5a based on the pressure loss caused by the communication holes 5d. The amount of water flowing through the water portion 5b can be made uniform. As shown in FIG. 5, the communication holes 5d of the plurality of first water collecting portions 5a can have larger diameters as the communication holes 5d are located farther from the discharge port 5c. The filtration module 1 may be more susceptible to the suction pressure of filtered water discharged from the discharge port 5c as the communication hole 5d is closer to the discharge port 5c. Therefore, it is considered that the variation in the filtration amount due to the suction pressure can be suppressed by increasing the opening area of the communication hole 5d located farther from the discharge port 5c. Further, the filtration module 1 increases the suction pressure by increasing the total opening area of the communication holes 5d, for example, by increasing the number of communication holes 5d in the first water collecting portion 5a located far from the discharge port 5c. It is considered possible to suppress variations in the filtration amount due to the above.

Note that the upper holding member 3 may be formed by integrally connecting a member having the first water collecting portion 5a and a member having the second water collecting portion 5b inside in a detachable manner. The member having the first water collecting part 5a inside and the member having the second water collecting part 5b inside may be detachably connected. Furthermore, the upper holding member 3 may be configured by detachably connecting a plurality of members having one first water collecting portion 5a inside to a member having the second water collecting portion 5b inside. .

<Second water collection part>
The second water collecting portion 5b is formed in a substantially rectangular parallelepiped shape having the longitudinal direction of the upper holding member 3 as the longitudinal direction. The volume of the second water collecting part 5b is substantially equal to the total volume of the plurality of first water collecting parts 5a.

(Lower holding member)
The lower holding member 4 fixes the lower ends of the plurality of hollow fiber membranes 2 in such a manner as to close the openings of the plurality of hollow fiber membranes 2. The lower holding member 4 is formed in a rod shape whose longitudinal direction is the longitudinal direction (X direction) in the horizontal direction of a bundle of a plurality of hollow fiber membranes 2. The lower holding member 4 is formed in a substantially rectangular parallelepiped shape. The lower holding member 4 has an upper surface and a lower surface parallel to the horizontal direction, and a plurality of hollow fiber membranes 2 are connected to the upper surface. The lower holding member 4 has a pair of concave grooves 4a extending in the longitudinal direction on a pair of side surfaces. The pair of concave grooves 4 a are formed at positions facing the horizontal direction of the pair of side surfaces of the lower holding member 4. The longitudinal length of the lower holding member 4 can be the same as the longitudinal length of the main body 3 a of the upper holding member 3. The average width of the lower holding member 4 can be the same as the average width of the main body 3 a of the upper holding member 3.

(Hollow fiber membrane)
The hollow fiber membrane 2 is formed by tubularly forming a porous membrane that permeates the liquid to be treated and prevents the permeation of impurities contained in the liquid to be treated.

As the hollow fiber membrane 2, a material mainly composed of a thermoplastic resin can be used. Examples of the thermoplastic resin include polyethylene, polypropylene, polyvinylidene fluoride, ethylene-vinyl alcohol copolymer, polyamide, polyimide, polyetherimide, polystyrene, polysulfone, polyvinyl alcohol, polyphenylene ether, polyphenylene sulfide, cellulose acetate, and polyacrylonitrile. And polytetrafluoroethylene (PTFE). Among these, PTFE which is excellent in mechanical strength, chemical resistance, heat resistance, weather resistance, nonflammability and the like and is porous is preferable, and uniaxially or biaxially stretched PTFE is more preferable. The material for forming the hollow fiber membrane 2 may be appropriately mixed with other polymers, additives such as a lubricant, and the like.

The lower limit of the average effective length of the hollow fiber membrane 2 (the average length of the plurality of hollow fiber membranes 2 between the lower end of the upper holding member 3 and the upper end of the lower holding member 4) is preferably 1 m and more preferably 2 m. preferable. The upper limit of the average effective length of the hollow fiber membrane 2 is preferably 6 m and more preferably 5 m. If the average effective length of the hollow fiber membranes 2 is less than the above lower limit, the amount of filtration by each hollow fiber membrane 2 may be insufficient. If the average effective length of the hollow fiber membrane 2 exceeds the above upper limit, the hollow fiber membrane 2 may be excessively bent due to its own weight, or the handleability when the filtration module 1 is attached or detached will decrease. There is a fear.

[Second Embodiment]
<Filtration module>
The filtration module 11 shown in FIG. 6 includes a plurality of hollow fiber membranes 2 that are aligned in a vertical direction and arranged in a curtain shape, an upper holding member 3 that fixes the upper ends of these hollow fiber membranes 2, and these hollow fibers. A lower holding member 12 for fixing the lower end of the membrane 2. The hollow fiber membrane 2 and the upper holding member 3 in the filtration module 11 are the same as the filtration module 1 in FIG. As shown in FIG. 7, in addition to the upper holding member 3, the filtration module 11 has an external pressure type or immersion type in which the lower holding member 12 has a filtered water passage 13 for discharging filtered water filtered by the hollow fiber membrane 2 inside. It is an expression filtration module.

As shown in FIG. 7, the filtration water channel 13 divides a plurality of hollow fiber membranes 2 in the longitudinal direction of the lower holding member 12, and a plurality of divided open ends of the hollow fiber membranes 2 communicate with each other. A first water collecting portion 13a and a second water collecting portion 13b having a discharge port 13c that communicates with the plurality of first water collecting portions 13a and discharges filtrate from one end of the lower holding member 12. Prepare. That is, in the filtration module 11, in addition to the upper holding member 3, the lower holding member 12 includes a plurality of first water collecting portions 13a and second water collecting portions 13b.

In the filtration module 11, in addition to the upper holding member 3, the lower holding member 12 has a plurality of first water collection portions 13 a and second water collection portions 13 b, so that filtered water that has permeated through the plurality of hollow fiber membranes 2. The flow rate of the water can be reduced, thereby lowering the suction pressure of the filtrate and further increasing the filtration efficiency.

(Lower holding member)
The lower holding member 12 has a shape in which the upper holding member 3 of the filtration module 1 of FIG. Specifically, the lower holding member 12 is formed in a rod-like and substantially rectangular parallelepiped shape with the longitudinal direction (X direction) in the horizontal direction of a bundle of a plurality of hollow fiber membranes 2 as the longitudinal direction. The lower holding member 12 has an upper surface and a lower surface parallel to the horizontal direction, and a plurality of hollow fiber membranes 2 are connected to the upper surface. The lower holding member 12 has a main body 12a to which a plurality of hollow fiber membranes 2 are connected on the upper surface, and a drain nozzle 12b that protrudes outward in the longitudinal direction from one longitudinal end of the main body 12a. The opening of the drain nozzle 12b forms a discharge port 13c. The lower holding member 12 is hermetically sealed except for the communication portion with the plurality of hollow fiber membranes 2 and the discharge port 13c. The lower holding member 12 has a pair of concave grooves 12c extending in the longitudinal direction on a pair of side surfaces. The pair of concave grooves 12 c are formed at positions facing the horizontal direction of the pair of side surfaces of the lower holding member 12. The specific size of each part of the lower holding member 12 is the same as that of the upper holding member 3.

<Filtration device>
Next, with reference to FIG.8 and FIG.9, the filtration apparatus 21 provided with the filtration module 1 of FIG. 1 is demonstrated. The filtration device 21 includes a plurality of filtration modules 1 and a water tank 22 that houses the plurality of filtration modules 1. The filtration device 21 includes a gas supply module 23 that supplies air bubbles from below the plurality of filtration modules 1. The filtration device 21 is configured as an external pressure type or immersion type filtration device. Since the said filtration apparatus 21 is provided with the several filtration module 1, it can attain the uniform filtration amount of the several hollow fiber membrane 2 as mentioned above, and can improve the production efficiency of filtered water.

The plurality of filtration modules 1 are integrally held by being connected to the frame 24. As shown in FIG. 8, the plurality of filtration modules 1 are arranged in two rows in a front view. Moreover, the several filtration module 1 is arrange | positioned in parallel at equal intervals in each row | line | column, as shown in FIG. Specifically, in the filtration device 21, a pair of filtration modules 1 are arranged in two rows so that the longitudinal ends of the upper holding member 3 and the lower holding member 4 are adjacent to each other. The filtration modules 1 are arranged at equal intervals so as to face the upper holding member 3 and the lower holding member 4 in the width direction. In the filtering device 21, a rod-shaped guide rail 25 is fitted into the pair of concave grooves 3c of the upper holding member 3 and the pair of concave grooves 4a of the lower holding member 4, and the guide rail 25 is a frame. 24 is fixed. As a result, the plurality of filtration modules 1 are held by the frame 24.

In the filtration device 21, a water collection pipe 26 is connected to the drain nozzle 3 b of the upper holding member 3 of each filtration module 1. Thereby, the said filtration apparatus 21 is comprised so that the filtration water which permeate | transmitted the several hollow fiber membrane 2 can be discharged | emitted from the filtration water path 5 of the upper side holding member 3 to the water collection pipe 26. FIG.

The water tank 22 is not particularly limited as long as the liquid to be treated can be stored and the filtration device 21 can be immersed in the liquid to be treated and has strength against the operating pressure of the filtration device 21. A concrete tank, a fiber reinforced plastic tank, etc. can be used.

The gas supply module 23 includes a straight tubular air diffusion header 23a disposed below the adjacent ends of the plurality of filtration modules 1 arranged in two rows, and an opposing side wall of the air diffusion header 23a. And a plurality of diffuser tubes 23b extending outward in the facing direction. The plurality of air diffusers 23b are arranged such that the central axis thereof is in the horizontal direction. Each air diffuser 23b has a plurality of air diffusers 23c. Further, the plurality of diffuser tubes 23b are arranged so as to be positioned between adjacent filtration modules 1 in each row. The gas supply module 23 has a gas pressure feeding unit (not shown) that supplies gas to the diffuser header 23a. The gas supply module 23 is configured to be able to discharge the gas pumped from the gas pumping unit from the plurality of air diffusion holes 23c of the plurality of air diffusion pipes 23b. In the gas supply module 23, bubbles discharged from the plurality of air holes 23 c rub against the surfaces of the plurality of hollow fiber membranes 2, and the plurality of hollow fiber membranes 2 are swung to thereby cause the hollow fiber membranes 2 to swing. It is configured to be able to remove impurities adhering to the surface. The gas pumping unit is not particularly limited, and for example, a known blower or compressor can be used.

[Other Embodiments]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is not limited to the configuration of the embodiment described above, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

For example, in the filtration module, one of the pair of holding members only needs to have a filtration water channel having a plurality of first water collection portions and second water collection portions inside, and for example, only the lower holding member has this A filtration channel may be provided. Moreover, the specific structure of the holding member which is not provided with the said filtration water channel is not specifically limited.

The said 2nd water collection part should just have the discharge port which discharges filtered water from the at least one side edge part of a holding member, for example, a pair of discharge port which discharges filtered water from the both ends of a holding member You may have. Moreover, when the said 2nd water collection part has the said pair of discharge port, although the communicating hole of several 1st water collection part may have the same diameter, it is located far from a pair of discharge port It is also possible to increase the diameter of the communication hole (that is, the communication hole located on the center side in the longitudinal direction of the holding member). Furthermore, when the second water collection part has the pair of discharge ports, the total opening area of the communication holes is increased by increasing the number of communication holes in the first water collection unit located far from the pair of discharge ports. It is also possible to enlarge it.

Other specific configurations are not particularly limited as long as the filtration device includes a plurality of the filtration modules and a water tank that accommodates the filtration modules. For example, the specific configuration of the above-described gas supply module is not particularly limited, and the filtration device does not necessarily include the gas supply module. Moreover, the said filtration apparatus does not necessarily need to arrange | position several filtration modules in 2 rows.

The filtration device does not necessarily need to include the filtration module 1 of FIG. 1, and may include the filtration module of other embodiments such as the filtration module 11 of FIG. 6, and the above-described communication only with the lower holding member. A filtration module having a water channel may be provided.

DESCRIPTION OF

SYMBOLS

1,11 Filtration module 2 Hollow fiber membrane 3 Upper

side holding member

3a,

12a Main body

3b,

12b Drain nozzle

3c, 4a,

12c Groove groove

4,12 Lower

side holding member

5,13

Filtration channel

5a, 13a 1st

water collection part

5b, 13b Second

water collecting part

5c, 13c Discharge port 5d Communication hole 21 Filtration device 22 Water tank 23 Gas supply module 23a Air diffuser header 23b Air diffuser tube 23c Air diffuser hole 24 Frame 25 Guide rail 26 Water collecting tube

Claims

A plurality of hollow fiber membranes that are aligned in a vertical direction and arranged in a curtain shape;
A pair of holding members that fix the upper and lower ends of these hollow fiber membranes,
At least one of the pair of holding members is an external pressure type or immersion type filtration module having a filtration water channel for discharging filtrate water filtered by the hollow fiber membrane inside,
The filtered water channel is
Dividing the plurality of hollow fiber membranes in the longitudinal direction of the holding member, and a plurality of first water collecting portions respectively communicating with the open ends of the plurality of divided hollow fiber membranes;
A filtration module comprising: a second water collection unit that communicates with the plurality of first water collection units and has a discharge port that discharges filtrate from at least one side end of the holding member.
2. The filtration module according to claim 1, wherein communication holes of the plurality of first water collection portions communicating with the second water collection portion are formed in a central portion of the first water collection portion in the longitudinal direction of the holding member. .
The filtration according to claim 1 or 2, wherein an average length of the first water collecting portion in the longitudinal direction of the holding member is 50 mm or more and 400 mm or less, and the number of the first water collecting portions is 2 or more and 8 or less. module.
The filtration module according to claim 1, 2 or 3, wherein each of the pair of holding members includes the plurality of first water collecting portions and second water collecting portions.
A plurality of filtration modules according to any one of claims 1 to 4,
And a water tank that houses the plurality of filtration modules.