JPH11347375A - Hollow fiber membrane filtration device - Google Patents

Abstract

(57) [Problem] To provide a hollow fiber membrane filtration device capable of preventing or preventing clogging of a hollow fiber membrane. SOLUTION: Hollow fiber membrane filtration provided with flow path switching means for switching connection between a raw water supply path for a hollow fiber membrane module loaded with a hollow fiber bundle and a drain discharge path for discharging concentrated water concentrated by the hollow fiber. apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow fiber membrane filtration apparatus, and more particularly, to a hollow fiber membrane filtration apparatus having a simple structure capable of easily removing even if an opening of a hollow fiber used for filtration is clogged. And a hollow fiber membrane filtration device.

[0002]

BACKGROUND OF THE INVENTION Liquids,
In particular, filters using hollow fiber membranes such as microfiltration membranes and ultrafiltration membranes have been widely used to remove bacteria, viruses, and other organic particles present in water.

[0003] Above all, hollow fiber membranes, which are hollow fiber-shaped hollow fiber membranes, have been widely used in filtration devices for filtering liquids because of their large membrane area per unit volume in modules.

[0004] By using a hollow fiber membrane, the throughput of liquid is 20 to
In the case of constructing a filtration device having a flow rate of 30 liter / min or more, conventionally, a bundle of hollow fiber membranes composed of 10,000 to 20,000 hollow fiber membranes and a comparison of housing the bundle of hollow fiber membranes are described. It has been common to connect a plurality of hollow fiber membrane modules each having a very small pressure vessel in parallel.

[0005] However, when a plurality of hollow fiber membrane modules are connected in parallel to constitute a filtration device having a larger throughput, if the number of hollow fiber membrane modules increases, the hollow fiber membrane modules are connected to each other. There was a problem that piping became complicated.

[0006] A hollow fiber membrane module is generally configured by loading a bundle of hollow fiber membranes into a cylindrical pressure vessel having one or both ends opened, and at the open end of the pressure vessel,
The bundle of hollow fiber membranes is formed by potting a thermosetting resin such as urethane resin or epoxy resin, cutting the potted ends to open both ends of the hollow fiber membranes. In the hollow fiber membrane module, an internal pressure type hollow fiber membrane in which raw water is filtered from the inside to the outside is usually used. Therefore, in the hollow fiber membrane module, raw water is supplied from one end of the hollow fiber membrane potted, and filtered water is taken out from the side surface of the pressure vessel.

Therefore, in the hollow fiber membrane module, there is a problem that the terminal opening of the hollow fiber membrane into which raw water flows is closed in a short time by fine particles in the raw water, and the hollow fiber membrane is clogged. Was.

The present invention provides a hollow fiber membrane filtration device having a simple structure which eliminates clogging which occurs when filtration is performed using a hollow fiber membrane module and which does not require frequent maintenance of the hollow fiber membrane module. The purpose is to provide.

According to the present invention, water filtration can be performed by diverting a conventionally used hollow fiber membrane module, and clogging of the hollow fiber generated during filtration can be easily eliminated, and frequent maintenance can be performed. It is an object of the present invention to provide a hollow fiber membrane filtration device having a simple structure that does not require a filter.

[0010] The present invention does not have the problem of a complicated piping provided in a filtration device in which a plurality of hollow fiber membrane modules are connected in parallel, and when the hollow fiber membrane is clogged with fine particles in raw water, the reverse occurs. It is an object of the present invention to provide a hollow fiber membrane filtration device capable of easily recovering performance by washing.

Another object of the present invention is to provide a hollow fiber membrane filtration device which can easily meet the demand even when a larger throughput is required.

[0012]

Means for solving the above problem are as follows. A hollow fiber bundle is accommodated in a case open at both ends, and both ends of the hollow fiber bundle are connected to the hollow fibers forming the hollow fiber bundle. A hollow fiber membrane module fixed at both ends of the case so that the ends are open, and forming a filtered water outflow channel for discharging the filtered water in the case; A raw water supply path for supplying concentrated water, a drain discharge path for discharging concentrated water passing through the hollow fiber, and a raw water supply path connected to one end of the hollow fiber membrane module. Connected to the other end of the hollow fiber membrane module, and the drain discharge path connected to the other end of the hollow fiber membrane module is connected to one end of the hollow fiber membrane module to which the raw water supply path is connected. Switching means for switching the road A hollow fiber membrane filtration device characterized by the fact that, in a preferred embodiment of the hollow fiber membrane filtration device, a plurality of hollow fiber membrane modules are used, and the plurality of hollow fiber membrane modules are provided in an outer case. The outer case is provided with a first liquid outlet which can be connected to the raw water supply passage or the drain discharge passage at one end of the hollow fiber membrane module so that the liquid can be led out of the hollow fiber membrane module. A first chamber in which one end of the yarn is open, and a second liquid outlet which can be connected to the raw water supply passage or the drain discharge passage for allowing the liquid to flow into and out of the other end; A second chamber in which the other end of the hollow fiber in the membrane module is open, and a filtered water outflow channel for taking out filtered water flowing out from a filtered water outlet in the hollow module. In another aspect, the switching means rotates the outer case, connects the raw water supply path connected to the first liquid outlet to the drain outlet, and connects the raw water supply path to the second liquid outlet. Means for connecting the drain discharge path to the raw water supply path. In still another preferred embodiment of the hollow fiber membrane filtration device, the switching means is connected to the raw water supply path in order toward the first liquid outlet. A first three-way switching valve and a second three-way switching valve mounted thereon, a third three-way switching valve and a fourth switching valve sequentially disposed in the drain discharge path toward the second liquid lead-in / out path, and It has a first bypass that connects the three-way switching valve and the fourth three-way switching valve, and a second bypass that connects the second three-way switching valve and the third three-way switching valve.

The present invention also provides (1) a first flow path connected to one of a raw water supply pipe for supplying raw water and a drain discharge pipe for discharging concentrated water, and a first flow path connected to one of the raw water supply pipe and the drain discharge pipe. A first chamber provided with the second flow path to be connected, and a third flow path for taking out filtered water to the outside, and a third chamber provided with the first flow path and the inside thereof, An outer case having a first partition partitioning watertightly into a first partition, and a second partition partitioning watertight into the third chamber and the second chamber having the second flow path; A hollow fiber membrane to be filtered, and a hollow fiber membrane case in which the hollow fiber membrane is housed and fixed at both ends, comprising a hollow fiber membrane case provided with a filtered water outflow channel on a side surface; A hollow fiber membrane module housed therein, wherein the outer case is The second flow path is rotationally symmetric with respect to the axis with respect to the first flow path, and one end face of the hollow fiber membrane module has To face the first chamber in the outer case, the other end face faces the second chamber in the outer case, and the filtered water flow channel provided on the side faces the third chamber in the outer case. The hollow fiber membrane filtration device is mounted on the first partition and the second partition in a watertight manner. (2) The outer case in the above (1) is provided with respect to the third channel in the above (1). (3) The hollow fiber membrane filtration device according to the above (1), which is an outer case rotatably formed, and (3) the third flow path in the above (1) includes a freely bendable bent portion. Hollow fiber membrane filtration according to (1) or (2), It is a device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Example 1 The hollow fiber membrane filtration device of the present invention uses a hollow fiber membrane module. As shown in FIG. 1, this hollow fiber membrane module 3
As will be described in detail later, a case 50 provided with an opening that opens at both ends and a filtered water outflow channel 31a formed on the peripheral side surface.
A hollow fiber bundle formed by bundling a plurality of hollow fibers is accommodated in the case 50 so that both ends of the hollow fiber bundle are open at the respective ends of the hollow fibers forming the hollow fiber bundle. The raw water that has been fixed at both ends of the case 50, the raw water that has flowed in from the one end opening of the hollow fiber, has passed through the hollow fiber membrane, has been filtered, and the filtered water has been discharged from the filtered water outflow channel 31a. And the concentrated water that is concentrated by flowing the water is discharged from the other end opening of the hollow fiber.

In the hollow fiber membrane filtration device of the present invention, raw water is supplied to the hollow fiber through a raw water supply path 51 for supplying raw water to one end opening of the hollow fiber in the hollow fiber membrane module 3. If the raw water supply is continued, the opening of one end (or the end) of the hollow fiber membrane module 3 may be blocked by impurities. Therefore, when a predetermined time comes, the one end opening of the hollow fiber in the hollow fiber membrane module 3 until then. The raw water supply passage 51 connected to the hollow fiber membrane module 3 is connected to the other end opening side of the hollow fiber in the hollow fiber membrane module 3 to which the drain discharge path 52 is connected. The drain discharge path 52 connected to the other end opening side of the hollow fiber is connected to the one end opening side of the hollow fiber membrane in the hollow fiber membrane module 3 so far. And essence to make the switching of the channel.

Since this hollow fiber membrane module is of a type that discharges concentrated water, a drain discharge path to be described later is designed to increase the pressure of the raw liquid from the raw liquid discharge path.
Raw water pressure increasing means is provided. As the raw water pressure increasing means, various means can be adopted as long as it has a function capable of increasing the pressure of the raw water, but as a simple device configuration, for example, a means provided in a drain discharge path is provided. A flow path restricting device (not shown) can be used. The flow path restricting device is appropriately disposed so as to be always installed on the drain discharge path side even when the flow path is switched.
Also, in the hollow fiber membrane filtration device in the following description, it is assumed that the flow passage restricting device is interposed in the drain discharge path or the drain discharge pipe.

When the flow path is switched in this manner, the hollow fiber membrane module 3 to which the raw water supply
At one end of the hollow fiber is switched from the liquid inlet to the liquid outlet. Therefore, when switching the flow path,
The raw water supply channel 51 is connected to the other end of the hollow fiber membrane module 3 to which the drain discharge channel 52 has been connected, and the hollow at one end of the hollow fiber membrane module 3 to which the raw water supply channel 51 has been connected. Since the concentrated water is discharged from the yarn opening,
The various blocking substances that have blocked the opening of the hollow fiber are washed away, and a state similar to that of performing the backwashing operation appears.

In the present invention, the hollow fiber membrane module 3
It is important to switch the inlet port of the raw water and the outlet port of the concentrated water to each other, and the switching is performed by switching means (also referred to as flow path switching means).

As the flow path switching means, the inlet of raw water in the hollow fiber membrane module can be switched to the outlet of concentrated water, and the outlet of concentrated water can be switched to the inlet of raw water. Various mechanisms are adopted as far as possible.

As shown in FIG. 2, the most primitive switching means is an end cap (not shown) attached to one end of the case 50 of the hollow fiber membrane module 3.
A male screw thread (not shown) formed on the outer peripheral surface of the end of the liquid outlet 53 provided on the outside, a male screw thread (not shown) formed on the outer peripheral surface of the end of the raw water supply passage 51, and the like. A first joint 54 formed on the inner peripheral surface of a female screw thread commonly screwed with a male screw thread, and a liquid provided on the other end cap attached to the other end of the case 50 in the hollow fiber membrane module 3 A male screw thread formed on the outer peripheral surface of the end of the outlet 53, a male screw thread formed on the outer peripheral surface of the end of the drain discharge path 52, and a female screw thread commonly engaged with these male screws are formed on the inner peripheral surface. 1 and 2 (not shown in FIGS. 1 and 2).

In the switching means shown in FIG.
The outer diameter of the liquid outlet 53, the outer diameter of the raw water supply passage 51, and the outer diameter of the drain discharge passage 52 are the same, in other words, a male thread provided on the outer periphery of the liquid outlet 53 and the raw water supply passage 51. It is important that the male thread of the drain joint 52 and the male thread of the drain discharge path 52 are formed to be screwable with the female thread of the first joint 54 and the female thread of the second joint.

In order to switch the flow path, the tip of the raw water supply passage 51 (the end which is a portion formed with a male thread) is connected from one liquid outlet 53 in the hollow fiber membrane module 3 to the other. The hollow fiber membrane module 3 is formed so as to be able to expand and contract to the liquid outlet 53, and the tip of the drain discharge channel 52 (the end which is a portion formed with a male thread) is formed.
From the other liquid outlet 53 to one liquid outlet 5
3 must be formed so as to be able to expand and contract. In order to form the raw water supply path 51 and the drain discharge path 52 so as to be able to expand and contract, the raw water supply path 51 and the drain discharge path 52 are formed in a spiral shape, a coil shape, a bellows shape, or another expandable structure with a flexible member. It may be formed in a pipe. Also, a raw water supply path main pipe (not shown) and one end thereof are connected to the raw water supply path main pipe, and the other end is formed with a male thread on the outer periphery thereof, and is formed so as to be capable of winding and rewinding. The raw water supply path 51 may be formed by the long pipe. Similarly, a drain discharge main pipe (not shown) and one end thereof are connected to the drain discharge main pipe, and the other end is formed with a male thread on the outer periphery thereof, so that winding and rewinding can be performed. The drain passage 52 may be formed by the formed long pipe.

Regardless of the switching means, when the raw water is supplied from the raw water supply path 51 to one end opening of the hollow fiber in the hollow fiber membrane module 3, the raw water passes through the hollow fiber and passes through the raw water. Is leached out of the hollow fiber membrane and filtered, and the filtered water flows out of the case 50 into the filtered water outflow channel 31.
The raw water flowing through the inside of the hollow fiber is condensed and discharged to the drain discharge path 52 from the other end opening of the hollow fiber. While such a filtering operation is being continued, there is a possibility that the one end opening of the hollow fiber into which the raw water flows is blocked by the solid matter.

Therefore, after a lapse of a predetermined time from the start of the supply of the raw water, or when the one end opening of the hollow fiber is closed with a solid substance, the switching means is used to switch the hollow fiber membrane module 3 until then. The raw water supply channel 51 is disconnected from the liquid supply / inlet channel 53 connected to the raw water supply channel 51, and the drain discharge channel 52 is connected to the liquid discharge / inlet channel 53 connected to the drain discharge channel 52 of the hollow fiber membrane module 3. The drain discharge path 52 is connected to the liquid lead-in / out path 53 to which the raw water supply path 51 has been connected, and the raw water supply path 51 has to be connected to the liquid lead-in / out path previously connected to the drain discharge path 52. To the road 53. Then, the raw water supply is restarted.

Then, in the hollow fiber membrane module 3, the liquid outlet / inlet passage 53 to which the raw water was supplied functions as a liquid inlet, but now has a function as a liquid outlet. The liquid lead-in / out path 53 from which the concentrated water has been discharged functions as a liquid discharge path, but now has a function as a liquid introduction path. As a result, the contaminants at the end opening of the hollow fiber which had been functioning as the liquid introduction path are washed away by the concentrated liquid discharged from the inside of the hollow fiber, so that the so-called backwashing function is exerted. And the blockage of the hollow fiber is eliminated or prevented.

The hollow fiber membrane filtration device described with reference to FIGS. 1 and 2 is a device for switching the flow paths of the raw water supply passage and the drain discharge passage while the hollow fiber membrane module is fixed. However, in the present invention, the raw water supply path and the drain discharge path are fixed without expanding or contracting, and the hollow fiber membrane module is configured such that the flow path is switched by rotating or rotating the hollow fiber membrane module. It may be a device.

In the above, the hollow fiber membrane filtration device described with reference to FIGS. 1 and 2 is a convenient filtration device capable of preventing clogging of the hollow fiber. In addition, there is a disadvantage in that the raw water supply operation, the drain discharge operation, and the filtered water removal operation must be temporarily stopped to switch between the raw water supply passage and the drain discharge passage. (2) Example 2 FIG. 3 shows an example of a hollow fiber membrane filtration device that can eliminate the disadvantages of the hollow fiber membrane filtration device as shown in Example 1 above. The hollow fiber membrane filtration device shown in this example is advantageous for the purpose of eliminating the clogging of the hollow fiber by switching the flow path without stopping the operation of the hollow fiber membrane filtration device.

As shown in FIG. 3, the hollow fiber membrane filtration device includes a hollow fiber membrane module 3, a raw water supply path 51, a drain discharge path 52, and a flow path switching means 54. The hollow fiber membrane module 3 has a structure similar to that of the hollow fiber membrane module 3 in the hollow fiber membrane filtration device described with reference to FIGS. 1 and 2, and end caps are attached to both ends of the case 50. The cap is provided with a liquid lead-in / out path. The details will be described later.

The raw water supply path 51 is connected to a raw water supply source and a liquid lead-in / out path 53 at an end cap attached to one end of the case 50, and the drain discharge path 52 is attached to the other end of the case 50. With the liquid outlet / inlet 53 in the end cap.

The flow path switching means 54 is provided between the first three-way switching valve 55 interposed in the raw water supply path 51 and the first three-way switching valve 55 and the liquid lead-in / out path 53 in the raw water supply path 51. Second three-way switching valve 56 interposed in
A third three-way switching valve 57 interposed in the drain discharge path 52; and a fourth three-way switching valve 57 interposed between the third three-way switching valve 57 and the liquid lead-in / out path 53 in the drain discharge path 52. Switching valve 58 and the first three-way switching valve 5
First bypass 59 connecting fifth and fourth switching valve 58
And the second three-way switching valve 56 and the third switching valve 57
And a second bypass 60 that couples the In addition,
Downstream of the third three-way switching valve 57 in the drain discharge path 52, a device for increasing the pressure on the raw water side, such as a flow path throttle device or a drain valve, is interposed.

A filtered water supply pipe is connected to a filtered water outflow channel 31a provided in a case 50 of the hollow fiber membrane filtration device.

In this hollow fiber membrane filtration device,
The first three-way switching valve 55, the second three-way switching valve 56, the third three-way switching valve 57, and the fourth three-way switching valve 58 are closed on the first bypass 59 side and the second bypass 60 side, respectively. Raw water is supplied from the raw water supply path 51 to the hollow fiber bundle via the liquid lead-in / out path 53. Raw water flows from one end opening of each hollow fiber in the hollow fiber bundle. The flowing raw water passes through the hollow fiber membrane and becomes filtered water. Raw water passing through the hollow portion of the hollow fiber is concentrated and flows out as concentrated water from the other end opening of the hollow fiber. The concentrated water that has flowed out is fed to the liquid
3 flows out to the drain discharge path 52. The filtered water flows to the filtered water supply pipe via the filtered water outflow channel 31a.

After a certain period of time has elapsed since the continuation of such a concentration operation, or when a decrease in the flow rate of the concentrated water from the drain discharge passage 52 or a decrease in the flow rate of the filtered water in the filtered water outflow passage 31a is detected. By switching the first three-way switching valve 55, the second three-way switching valve 56, the third three-way switching valve 57, and the fourth three-way switching valve 58,
The raw water flowing through the raw water supply passage 51 is supplied to the first three-way switching valve 5.
5, the first bypass 59, and the fourth three-way switching valve 58, and the liquid lead-in / out channel 53 to which the raw water supply channel 51 is connected, the first three-way switching valve 55, the second bypass 59, and the third Three-way switching valve 57 and drain discharge path 52
Is connected.

Then, the raw water flows through the raw water supply passage 51, the first three-way switching valve 55, the first bypass 59, the fourth three-way switching valve 58, and the liquid outlet 53 to which the drain discharge passage 52 is connected. It reaches the end opening of the yarn and flows into the hollow fiber. Raw water flowing through the hollow fiber passes through the hollow fiber membrane to become filtered water, and raw water passing through the hollow portion of the hollow fiber is concentrated to become concentrated water, as described above. Until the switching operation is performed, the concentrated water flows out from the terminal opening of the hollow fiber that has been the inlet of the raw water. The solid matter adhering to the terminal opening is washed away by the concentrated water, and the liquid outlet 53, the raw water supply path 51, the second three-way switching valve 5
6, circulating through the second bypass 60, the third three-way switching valve 57 and the drain discharge path 52.

As described above, even in this example, the aforementioned example 1
In the same manner as in the above, the solid content closing the end opening of the hollow fiber can be removed by backwashing.

The hollow fiber membrane filtration device in this example is provided with a first three-way switching valve 5 in the flow path switching means 54.
5. Second three-way switching valve 56, third three-way switching valve 57
And the fourth three-way switching valve 58 may be manually switched. However, if the switching operation of these switching valves is performed by a control unit, for example, an arithmetic control unit in a computer, unmanned operation becomes possible.

In the hollow fiber membrane filtration device shown in this example, the hollow fiber membrane module is in a fixed state, and the raw water supply path and the drain discharge path do not need to be configured to be stretchable. However, the flow path can be switched by the valve switching operation, and unmanned operation can be performed by the operation command of the computer.

In the present invention, a hollow fiber membrane having a plurality of hollow fiber membrane modules 3 loaded in an outer case 1 as shown in FIG. 4 instead of the hollow fiber membrane module shown in FIG. Using the module set, the first conduit 11 in this hollow fiber membrane module set is connected to the raw water supply path 5
1 and includes a hollow fiber membrane filtration device in which the second conduit 12 in the hollow fiber membrane module set is connected to a drain discharge path 52. In the hollow fiber membrane filtration device having such a configuration, the hollow fiber membrane module set does not need to be rotated as described later, and the hollow fiber membrane module set can be operated only by switching the valve and without interrupting the operation. Can be prevented or clogged at the opening of the opening. (3) Example 3 The present invention will be described more specifically.

The hollow fiber membrane filtration device as an example of the present invention comprises:
(A) a first flow path connected to one of a raw water supply pipe as an example of a raw water supply path and a drain discharge pipe as an example of a drain discharge path, and a first flow path connected to the other of the raw water supply pipe and the drain discharge pipe; And a third flow path for taking out filtered water, and a first flow path having the first flow path therein.
A first partition partitioning watertight into a chamber and a third chamber having the third flow path; a second partition partitioning watertight into the third chamber and the second chamber having the second flow path; An outer case comprising:
(B) a hollow fiber membrane module housed in the outer case.

The outer case is provided rotatably about an axis intersecting the outer case, and the first flow path and the second flow path provided in the outer case are rotationally symmetric with respect to the axis. is there.

The hollow fiber membrane module comprises: a hollow fiber membrane case accommodating the internal pressure type hollow fiber; and a side face provided with a filtered water outflow channel; Has a hollow fiber membrane fixed to both ends in a watertight manner for filtering raw water. The hollow fiber membrane is open at both end faces of the hollow fiber membrane case.

In the hollow fiber membrane module, one end face faces the first chamber in the outer case, and the other end face faces the second chamber in the outer case. The road is watertightly mounted on the first partition and the second partition so that a path faces the third chamber in the outer case.

Hereinafter, one embodiment of the hollow fiber membrane filtration device according to the present invention will be described with reference to the drawings. 1. Example of hollow fiber membrane filtration device of the present invention An example of the hollow fiber membrane filtration device of the present invention is shown in FIG.

The hollow fiber membrane filtration device shown in FIG. 4 includes an outer case 1 having a substantially cylindrical shape.

As shown in FIG. 4, the outer case 1
It has a main body 1b and a lid 1a. One end of the main body 1b is opened, and the other end is formed on a closed end face 1b2 having a liquid outlet. The lid 1a is attached to an opening at one end of the main body 1b, and covers the opening.

The lid 1a has a substantially cylindrical shape in which one end face 1a2 forming the other end face of the outer case 1 is formed at one end and the other end is open. A first conduit 11 extending in a direction perpendicular to the end surface 1a2 is erected on the end surface 1a2, and an outwardly extending flange 1a1 is formed in the opening. The first pipe 11 is connected to one of a raw water supply pipe A and a drain discharge pipe B, which will be described later.

In the main body 1b, the end face 1b2
A second conduit 12 extending in a direction perpendicular to the end face 1
b2, the opening 1 has an outwardly extending flange 1
b1 is formed. The second pipe 12 is connected to the other of the raw water supply pipe A and the drain discharge pipe B. From the side surface of the main body 1b, a filtered water discharge pipe 14 extends outward in a radial direction of the main body 1b. The filtered water discharge pipe 14 is provided with end faces 1a2 and 1a in the outer case 1 formed by the main body 1b and the lid 1a.
It is located at the same distance from any of b2. The filtered water extraction pipe 14 is connected to a third pipe 13 extending along the axis L by a watertight joint 13a rotatable around the axis L of the filtered water extraction pipe.

The second conduit 12 is provided at a position rotationally symmetric with respect to the axis L with respect to the first conduit 11. A screw is cut at each end of the first conduit 11, the second conduit 12, and the third conduit 13. still,
The first conduit 11 and the second conduit 12 have the same outer diameter and the same pitch of the screw cut at the end.

As shown in FIG. 4, a first partition wall 2 provided inside the lid portion 1a and parallel to the end face 1a2 is provided.
And the second partition wall 4 provided near the end face 1b2 in the interior of the main body 1b and parallel to the end face 1b2, the inside of the outer case 1
1 having the first chamber 1A and the second chamber 1 having the second conduit 12
B and a third chamber 1C having a third flow path.

An annular projection 1a3 for supporting the first partition 2 is provided on the inner wall of the lid 1a. The surface of the annular projection 1a3 on the side facing the third chamber 1C is formed perpendicular to the side wall of the lid 1a. The first partition 2 is supported by the annular projection 1a3 by contacting the surface of the annular projection 1a3 with the surface of the first partition 2 facing the first chamber 1A. An O-ring 21 is fitted around the outer periphery of the first partition 2, and the inner wall of the lid 1a and the first
To prevent water from leaking from between the outer peripheral portion of the housing.

A projection 1b3 for supporting the second partition 4 is provided on the inner wall of the main body 1b. The surface of the projection 1b3 on the side facing the third chamber 1C is formed perpendicular to the side wall of the main body 1b. The second partition 4 is supported by the projection 1b3 when the surface of the projection 1b3 contacts the surface of the second partition 4 facing the second chamber 1B. An O-ring 41 is fitted into the outer peripheral portion of the second partition 4 to prevent water from leaking from between the inner wall of the main body 1b and the outer peripheral portion of the second partition 4.

The first partition 2 is a disk having an outer diameter substantially equal to the inner diameter of the outer case 1 and has a hollow fiber membrane module mounting opening 22 which is an opening for mounting a hollow fiber membrane module 3 described later. , One at the center and six at the periphery. As shown in FIG. 4, the side of the hollow fiber membrane module mounting port 22 facing the third chamber 1 </ b> C has an inner diameter substantially equal to the outer diameter of the end of the hollow fiber membrane module 3, and
The side facing A has an inner diameter smaller than the outer diameter of the end of the hollow fiber membrane module 3. The portion of the hollow fiber membrane module mounting port 22 facing the third chamber 1C and the first
A step is provided between the portion facing the chamber 1A.

The second partition 4 is also similar to the first partition 2,
A disk having an outer diameter substantially equal to the inner diameter of the outer case 1, and one hollow fiber membrane module mounting port 42 as an opening for mounting the hollow fiber membrane module 3, one at the center and six at the periphery. Is provided. Like the first partition 2, the second partition 4
Also, the hollow fiber membrane module mounting port 42 has an inner diameter substantially equal to the outer diameter of the end of the hollow fiber membrane module 3 on the side facing the third chamber 1C, and the hollow hole on the side facing the second chamber 1B. It has an inner diameter smaller than the outer diameter of the end of the yarn membrane module 3. A step is provided between a portion of the hollow fiber membrane module mounting port 42 facing the third chamber 1C and a portion facing the second chamber 1B.

As shown in FIG. 5, the hollow fiber membrane module 3 housed in the outer case 1 has a hollow fiber membrane case 31 having a substantially cylindrical shape and open at both ends. And a bundle of internal pressure type hollow fiber membranes 32 loaded inside the case 31. At both ends of the hollow fiber membrane case 31, the internal pressure type hollow fiber membrane 32 is potted with a thermosetting resin.
1 and 312 are formed. The internal pressure type hollow fiber membrane 3
Both ends of 2 are open, and an opening 32a and an opening 32b are formed. In the vicinity of the potting parts 311 and 312 on the side surface of the hollow fiber membrane case, a filtered water outlet 31a is provided, respectively.

As shown in FIG. 4, the hollow fiber membrane module 3
Is fitted at one end to a hollow fiber membrane module mounting port 22 provided in the first partition 2 and at the other end to a hollow fiber membrane module mounting port 42 provided in the second partition 4. Fitted. Then, a packing 33 inserted into one end of the hollow fiber membrane case 31 provided in the hollow fiber membrane module 3 is in close contact with the inner peripheral surface of the hollow fiber membrane module mounting port 22 in the first partition 2, and the hollow fiber case The packing 34 fitted to the other end of the base 31 is in close contact with the inner peripheral surface of the hollow fiber membrane module mounting port 42 in the second partition 4. As a result, leakage of water from between the outer peripheral surface of the hollow fiber membrane module 3 and the inner peripheral surfaces of the hollow fiber membrane module mounting port 22 and the hollow fiber membrane module mounting port 42 is prevented.

In the hollow fiber membrane filtration device shown in FIG. 4, the outer case 1, the first conduit 11, the second conduit 12, the third conduit 13,
The first chamber 1A, the second chamber 1B, and the third chamber 1C are respectively the outer case, the first flow path, the second flow path, the third flow path, the first chamber, and the first chamber in the hollow fiber membrane filtration device of the present invention. The first partition 2 and the second partition 4 correspond to the first partition and the second partition, respectively, in the hollow fiber membrane filtration device of the present invention. The hollow fiber membrane module 3 corresponds to a hollow fiber membrane module in the hollow fiber membrane filtration device of the present invention, and the hollow fiber membrane case 31 corresponds to a hollow fiber membrane case in the hollow fiber membrane filtration device of the present invention. Internal pressure type hollow fiber membrane 3
2 corresponds to a hollow fiber membrane in the hollow fiber membrane filtration device of the present invention. Hereinafter, the operation of the hollow fiber membrane filtration device shown in FIG. 4 will be described.

FIG. 6 shows a state in which the hollow fiber membrane filtration device of FIG. 4 is interposed in a water supply pipe. In FIG. 6, a water supply pipe is connected to a water supply, and a raw water supply pipe A for supplying raw water to the hollow fiber membrane filtration device, and a drain discharge pipe for discharging concentrated water concentrated by the hollow fiber membrane filtration device to the outside. B and a filtered water supply pipe C connected to a water-supplied building to which filtered water is supplied, such as an apartment, an apartment, and an office building. The raw water supply pipe A and the drain discharge pipe B
Are provided with union joints A1 and B1, respectively. A drain valve B2 is interposed in the drain discharge pipe B near the union joint B1.
An example of the drain valve B2 is an adjustment valve whose opening degree can be adjusted. Note that the drain discharge pipe B is not limited to a mode in which the drain valve B2 is provided as long as resistance is generated when the concentrated liquid flows. As such a drain discharge pipe B, for example, a pipe having a throttle formed in the vicinity of the union joint B1 can be mentioned.

The raw water supply pipe A is connected to one of the first pipe 11 and the second pipe 12 by the union joint A1, and the drain discharge pipe B is connected to the union joint B
1 connects to the other of the first pipeline 11 and the second pipeline 12. Union fitting C1 at the end of filtered water supply pipe C
Is provided, and the filtered water supply pipe C is connected to the third pipe 13 by the union joint C1.

FIG. 6A shows a state in which the second pipe 12 in the hollow fiber membrane filtration device is connected to the raw water supply pipe A and the first pipe 11 is connected to the drain discharge pipe B. . On the other hand, (B) shows a state in which the first pipe 11 is connected to the raw water supply pipe A and the second pipe 12 is connected to the drain discharge pipe B.

In the state shown in FIG.
The raw water flows into the second chamber 1B of the outer case 1 through the second conduit 12. The raw water flowing into the second chamber 1B is
From one end of the hollow fiber membrane module 3, the internal pressure type hollow fiber membrane 32
Through the opening 32b of the internal pressure type hollow fiber membrane 32,
That is, it flows into the hollow part. Here, when the drain valve B2 is throttled, pressure is applied to the raw water supplied to the hollow fiber membrane filtration device, so that the raw water flowing into the hollow portion of the internal pressure type hollow fiber membrane 32 permeates through the internal pressure type hollow fiber membrane 32. I do. The filtered water that has passed through the internal pressure type hollow fiber membrane 32 flows out into a space formed between the internal pressure type hollow fiber membrane 32 and the hollow fiber membrane case 31, and passes through the filtered water outflow channel 31a to form a third filter water. Outflow to room 1C.
The filtered water flowing out to the third chamber 1C flows out to the filtered water supply pipe C through the third pipe 13. When the liquid permeates through the internal pressure type hollow fiber membrane 32, impurities to be removed such as bacteria and viruses are removed from the raw water. Therefore, impurities such as bacteria and viruses are contained from the third flow path. No filtered water flows out. On the other hand, the concentrated water is discharged from the opening 32a of the internal pressure type hollow fiber membrane 32 opposite to the opening 32b, and the concentrated water passes through the first conduit 11 and the drain discharge pipe B to the outside. Is discharged.

When the opening 32b of the hollow fiber membrane 32 is clogged with fine particles in the raw water in the state shown in FIG. 6A, the union joints A1 and B1 are loosened and the raw water supply pipe A is connected to the second pipe. The line 12 is removed, and the first line 11 is removed from the drain discharge pipe B. Then, the outer case 1 is
Rotate 180 ° about axis L. As mentioned above,
Since the pipeline 12 is rotationally symmetric with respect to the axis L with respect to the first pipeline 11, when the outer case is rotated by 180 ° from the state shown in FIG.
At the end of the raw water supply pipe A, and the end of the second pipeline 12 faces the end of the drain discharge pipe B. When the union joints A1 and B1 are tightened in this state, the raw water supply pipe A and the first pipe 11 are connected, and the drain discharge pipe B and the second pipe 12 are connected. This state is shown in FIG.

In the state shown in FIG. 6B, the raw water supplied from the raw water supply pipe A passes through the first pipe 11 and flows into the first chamber 1A of the outer case 1. The raw water flowing into the first chamber 1A flows into the hollow portion of the internal pressure type hollow fiber membrane 32 from one end of the hollow fiber membrane module 3 through the opening 32a of the internal pressure type hollow fiber membrane 32. The raw water that has flowed into the hollow portion of the internal pressure type hollow fiber membrane 32 is (A)
As in the case of (1), the water is filtered by the internal pressure type hollow fiber membrane 32 and supplied to the water-supplied building through the third chamber 1C and the filtered water supply pipe C. On the other hand, the opening 32b of the internal pressure type hollow fiber membrane 32
Since the concentrated water is discharged from the apparatus, the fine particles closing the opening 32b are removed by the pressure of the concentrated water,
The water is discharged to the outside through the second pipe 12 and the drain discharge pipe B together with the concentrated water. Thus, clogging of the opening 32b is eliminated. By opening the drain valve B2, the clogging of the opening 32b can be more efficiently eliminated. 2. Description of Components of Hollow Fiber Membrane Filtration Device of the Present Invention Hereinafter, components of the hollow fiber membrane filtration device of the present invention will be described. 2.1 Outer Case In the hollow fiber membrane filtration device of the present invention, the outer case has a function as a container for accommodating a hollow fiber membrane module described later, a function of introducing raw water into one end of the hollow fiber membrane module, and the hollow case. It has a function of collecting concentrated water flowing out from the other end of the fiber membrane module and discharging the same to the outside, and a function of collecting filtered water that has passed through the hollow fiber membrane module and extracting the filtered water to the outside.

Examples of the raw water that can be supplied to the hollow fiber membrane filtration device of the present invention include tap water, industrial water, and well water.

The outer case has a first flow path connected to one of a raw water supply pipe for supplying raw water and a drain discharge pipe for discharging concentrated water, and a first flow path connected to the other of the raw water supply pipe and the drain discharge pipe. And a second flow path. The outer case further includes a third flow path for taking out filtered water filtered by the hollow fiber membrane module to the outside.

The outer case is formed so as to be rotatable around an axis intersecting with the outer case. As an aspect in which the outer case is configured to be rotatable around the axis, a first flow path is provided at a position where the axis intersects on a wall surface of the outer case so as to be rotatable with respect to the outer case.
And a second mode in which a shaft extending on the axis is provided in the outer case, and the outer case is rotatably held on the shaft. The outer case having the second aspect is formed of a tube made of a soft material selected from rubber, a thermoplastic elastomer, a soft synthetic resin, and the like, and a bellows-type tube made of a metal or the like. The third channel can be formed by a conduit having a bent portion.

The first flow path is provided at a position rotationally symmetric with respect to the axis with respect to the second flow path. Examples of the first flow path and the second flow path include an opening and a pipe provided on a wall surface of the outer case. In the hollow fiber membrane filtration device having a pipe as the first flow path and the second flow path, a joint such as a union joint connected to a raw water supply pipe and a drain discharge pipe may be provided at an end of the pipe. it can. In addition, the first flow path and the second flow path
In a hollow fiber membrane filtration device having an opening as a flow path, a screw into which the ends of the raw water supply pipe and the drain discharge pipe are screwed can be formed on the inner periphery of the opening.

The third flow path includes the first flow path and the second flow path.
As in the case of the flow path, an opening and a pipe provided on the wall surface of the outer case can be exemplified. In a hollow fiber membrane filtration device in which a pipe is used as the third flow path, a joint that connects to a water supply pipe in a water-supplied building such as an apartment, an apartment, or an office building is provided at an end of the pipe. be able to. Further, in the hollow fiber membrane filtration device having an opening as the third flow path, a screw with which the end of the water supply pipe is screwed can be formed on the inner periphery of the opening.

The shape of the outer case can be arbitrarily selected according to the inflow pressure of raw water and the number of hollow fiber membrane modules to be housed.

As the shape of the outer case, in addition to the cylindrical shape as shown in FIG. 4, for example, a bale shape in which both end surfaces of the cylindrical shape are outwardly curved surfaces, a cocoon shape, and a cigar shape , An egg, a rugby ball, a spheroid, a sphere, and a disk. The shape of the outer case is, in addition to this, square, pentagonal,
Examples of the shape include a prism such as a hexagonal prism and an octagonal prism, a rectangular parallelepiped, an elliptic cylinder, a regular dodecahedron, and a regular icosahedron.

It is preferable that the outer case be dividable into two or more parts because it is convenient for storing and taking out the hollow fiber membrane module. There is no particular limitation on the mode in which the outer case can be divided into two or more portions. For example, in the case of an outer case having a shape of a rotating body, the outer case is orthogonal to the center axis. It may be configured to be able to be divided along a plane, or may be configured to be able to be divided along a plane including the central axis. When the outer case has a prismatic shape, the outer case may be configured to be able to be divided along a plane parallel to the bottom surface, and may be configured along a plane orthogonal to the bottom surface. And may be configured to be divided. In the case of an outer case having a cylindrical shape, a bale shape, a prism shape, or a rectangular parallelepiped shape, the rotary body may be configured to be divided into a lid and a main body. Examples of the material of the outer case include stainless steel, carbon steel, high-strength steel, alloy steel for boilers, alloy steel for pressure vessels, cast iron, malleable cast iron, titanium alloy, nickel-based alloy, nickel-cobalt-based alloy, and aluminum. Examples thereof include metal materials such as alloys, fiber reinforced resins such as glass fiber reinforced resins, carbon fiber reinforced resins, and aramid fiber reinforced resins, fiber reinforced metals, ceramics, and fiber reinforced ceramics.

When the outer case has a shape having two opposing end faces such as a cylindrical shape, a bale shape, and a prism shape, a first flow path is provided on one end face and the other end face is provided. Can be provided with a second flow path. Also, the first end face
A flow path may be provided, and a second flow path may be provided on a side surface. Furthermore, both the first flow path and the second flow path may be provided on one end surface. In the outer case, the third flow path may be provided on a side surface or on one end surface.

In the case of an outer case configured to be divided into two parts, a first flow path is provided in one of the divided outer cases, and a second flow path is provided in the other of the divided outer cases. It is possible to provide both the first flow path and the second flow path in one of the divided outer cases. 2.2 1st partition and 2nd partition The said outer case is a 1st partition and 2nd partition which hold both ends of the hollow fiber membrane module mentioned later, and the said 1st partition.
The first chamber having a flow path, the second chamber having the second flow path, and the third chamber having the third flow path are watertightly divided.

The first partition walls the inside of the outer case with the first partition.
The second partition has a function of partitioning the interior of the outer case into a second chamber and a third chamber in a watertight manner. Here, “partitioning in a watertight manner” means to divide the inside of the outer case so that water does not leak from between the inner wall of the outer case and the outer periphery of the outer case partition.

Further, the first partition and the second partition have a function of holding the hollow fiber membrane module at a predetermined position inside the outer case. Here, to hold the hollow fiber membrane module in a watertight manner means to hold the hollow fiber membrane module so that liquid does not leak from between the hollow fiber membrane module and the first partition and the second partition.

The first partition and the second partition may be, for example, a plate having a circular, rectangular or polygonal shape and having two or more openings for mounting a hollow fiber membrane module. . The plate-like body may be fixed to an inner wall of an outer case, or may be detachably attached. Examples of modes for fixing the plate-like body to the inner wall of the outer case include bonding, heat fusion, and welding. When the plate-like body is detachably attached to the inner wall of the outer case, a packing such as an O-ring is inserted into the periphery of the plate-like body, while the plate-like body is attached to the inner wall of the outer case by a predetermined amount. Protrusions or grooves or the like that hold in position can be provided. Note that a packing such as an O-ring can be inserted into an opening of the plate-like body where the hollow fiber membrane module is to be mounted.

As the first partition and the second partition,
A partition provided integrally with the outer case and having two or more openings for mounting the hollow fiber membrane module can be given. 2.3 Hollow Fiber Membrane Module The hollow fiber membrane module is a hollow fiber membrane case accommodating an internal pressure type hollow fiber and having a filtered water outflow channel provided on the side surface, and each end having an inner wall of the hollow fiber membrane case. And a hollow fiber membrane having both ends opened and fixed to both ends in a watertight manner. If the both ends of the hollow fiber membrane module can be watertightly mounted on the first partition and the second partition,
The shape of the hollow fiber membrane module is not particularly limited. Examples of such a shape include a cylindrical shape, an elliptic cylindrical shape, a prismatic shape, and a rectangular parallelepiped shape. 2.3.1 Hollow fiber membrane case The hollow fiber membrane case has a function of holding the hollow fiber membrane inside,
A function of forming the outer shell of the hollow fiber membrane module. Examples of the empty fiber membrane case include a cylindrical hollow fiber membrane case having openings at both ends and having a filtered water outlet on the side surface. The location where the filtered water outlet is provided in the hollow fiber membrane case is not particularly limited as long as it is on the side surface of the hollow fiber membrane case. Also, the number of filtered water outlets is not limited.

Various methods can be used for fixing the hollow fiber membrane inside the hollow fiber membrane case.

For example, in the case of a hollow fiber membrane case having openings at both ends, a bundle of hollow fiber membranes is loaded inside, and the hollow fiber membrane case is formed at both ends of the hollow fiber membrane case using a thermosetting resin. Is fixed by potting. In the hollow fiber membrane module in which the hollow fiber membrane is fixed by the above method, by cutting the potted both ends, a raw water inlet into which raw water flows is formed at one end, and a concentrated water outlet from which concentrated water flows out. Can be formed at the other end. 2.3.2 Hollow fiber membrane The hollow fiber membrane has a function of filtering the raw water.

Examples of such hollow fiber membranes include, for example, microfiltration membranes for mainly removing particles having a size of sub-μm or more such as viruses and bacteria, high molecular weight organic substances such as proteins and polysaccharides, and colloidal particles. Liquids such as ultrafiltration membranes that remove sub-μm or smaller particles and solutes such as emulsion particles, and reverse osmosis membranes that mainly remove solutes such as low molecular organic substances such as sugars, amino acids, and vitamins, and salts. And a membrane used for filtration.

The structure of the hollow fiber membrane is not limited. For example, as a microfiltration membrane, a homogeneous membrane having a homogeneous porous structure,
Examples of the membrane include an asymmetric membrane in which the pore diameter changes in the membrane cross-sectional direction, a stretched membrane in which pores are formed by tearing a nonporous thin film, and an ultrafiltration membrane and a reverse osmosis membrane. A composite membrane in which a separation layer is formed on the surface of the membrane by interfacial polymerization or the like can be given.

The material of the hollow fiber membrane is not limited, and examples of the microfiltration membrane include cellulose resins such as cellulose acetate, cellulose triacetate, cellulose butyrate, and cellulose acetate butyrate, nylon 6, nylon 66, nylon 10, Polyamide resins such as nylon 6T and poly-m-silicylene adipamide; polysulfone resins such as polysulfone, polyethersulfone and polyetherethersulfone; poly (vinylidene fluoride) and poly (ethylene tetrafluoride) High hollow fiber membranes formed from polymer materials such as fluorine-based resins such as fluorinated resins and polyolefin-based resins such as polyethylene and polypropylene, as well as ceramic films, porous carbon sintered films, and porous metal sintered films Inorganic material film.
Further, as the material used for the ultrafiltration membrane and the reverse osmosis membrane, cellulose acetate, cellulose triacetate, cellulose butyrate, and cellulose resins such as cellulose acetate butyrate,
Nylon 6, Nylon 66, Nylon 10, Nylon 6
Examples thereof include polyamide resins such as T and poly-m-silicylene adipamide, polysulfone resins such as polysulfone, polyethersulfone, and polyetherethersulfone, and poly (vinylidene fluoride).

As the hollow fiber membrane, an internal pressure type hollow fiber membrane which pressurizes from the inside can be used. 2.3.3 Relationship between Hollow Fiber Membrane Module and First and Second Partitions The hollow fiber membrane module has one end facing the first chamber in the outer case and the other end facing the second chamber. The inside of the outer case is held by the first partition and the second partition so that the filtered water outlet faces the third chamber.

In the hollow fiber membrane module, for example, an opening having substantially the same shape and size as the outer periphery surrounding the side surface of the hollow fiber membrane module is opened in the first partition and the second partition, and the hollow fiber membrane module is opened. By fitting the module into this opening, the module can be mounted on the first partition and the second partition. The first partition and the second partition may be provided at a position supporting an end of the hollow fiber membrane module,
The hollow fiber membrane module may be provided at a position that supports a central portion thereof. In the inner peripheral surface of the opening provided in the first partition and the second partition, and in the hollow fiber membrane module,
If a packing such as an O-ring is fitted on one of the outer peripheral surfaces of the portion fitted in the opening, the inner periphery of the opening and the outer periphery of the hollow fiber membrane module are completely adhered to each other, and the opening is Liquid leakage between the and the hollow fiber membrane module can be completely prevented.

When the ends of the hollow fiber membrane module are fitted into the openings of the first partition and the second partition, for example, as shown in FIG. 4, a step is formed in the opening of the outer case partition. And the end of the hollow fiber membrane module can be held by this step.

In addition, a screw is cut at both ends of the hollow fiber membrane module, and the end of the hollow fiber membrane module is connected to the first end.
It can be inserted into the openings of the partition and the second partition and fixed with a nut. In addition, at both ends of the hollow fiber membrane module, in the vicinity of the threaded ends, inflatable portions having a size that cannot pass through the openings of the first partition and the second partition are formed, and the respective expansion portions are formed. The first partition and the second partition may be fixed between the inflatable portion and the nut. Furthermore, screws are cut also at the openings of the first partition wall and the second partition so that the screws provided at the end of the hollow fiber membrane module are screwed, and provided at the end of the hollow fiber membrane module. The hollow fiber membrane module may be fixed to the opening of the outer case partition by screwing the screw with the screw of the opening. 3. Another example of the hollow fiber membrane filtration device according to the present invention Another example of the hollow fiber membrane filtration device according to the present invention is shown in FIG.
7, the same reference numerals as those in FIGS. 4 to 6 denote the same elements as those shown in FIGS. 4 to 6, unless otherwise specified.

[0086] In the hollow fiber membrane filtration device shown in Fig. 7, a common portion extending outward in the radial direction at a position equidistant from both the end surface 1a2 and the end surface 1b2 on the side surface of the outer case 1. Shaft 15 having an axis L of
a and 15b are erected. The rotating shafts 15a and 15b are rotatably supported by bearings 16, respectively. On the side surface of the main body 1b of the outer case 1, a filtered water discharge pipe 14 extends outward in the radial direction. On the other hand, one end is connected to the filtered water discharge pipe 1
The third conduit 13 connected to the fourth pipe 13 includes a flexible bendable portion 13b made of an elastomer, and a substantially inflexible rigid portion 13c provided at one end of the bent portion 13b. I have. The third conduit 13 is connected to the filtered water discharge conduit 14 at an end of the bent portion 13b opposite to the end where the rigid portion 13c is provided.

The second conduit 12 is provided at a position rotationally symmetric with respect to the first conduit 11 with respect to the axis L of the rotating shafts 15a and 15b. The first conduit 11,
Each end of the second pipeline 12 and the third pipeline 13 is threaded. As in the case of the hollow fiber membrane filtration device shown in FIG. 4, the first conduit 11 and the second conduit 12 have the same outer diameter and the same pitch of the screws provided at the ends.

In the hollow fiber membrane filtration device shown in FIG. 7, the outer case 1, the first pipe 11, the second pipe 12, the third pipe 13,
The first chamber 1A, the second chamber 1B, and the third chamber 1C are respectively the outer case, the first flow path, the second flow path, the third flow path, the first chamber, and the first chamber in the hollow fiber membrane filtration device of the present invention. The first partition 2 and the second partition 4 correspond to the first partition and the second partition, respectively, in the hollow fiber membrane filtration device of the present invention. The hollow fiber membrane module 3 corresponds to a hollow fiber membrane module in the hollow fiber membrane filtration device of the present invention, and the hollow fiber membrane case 31 corresponds to a hollow fiber membrane case in the hollow fiber membrane filtration device of the present invention. Internal pressure type hollow fiber membrane 3
2 corresponds to a hollow fiber membrane in the hollow fiber membrane filtration device of the present invention.

Hereinafter, the operation of the hollow fiber membrane filtration device shown in FIG. 7 will be described.

FIG. 8 shows a state in which the hollow fiber membrane filtration device of FIG. 7 is interposed in a water supply pipe.

FIG. 8A shows a state in which the first pipe 11 in the hollow fiber membrane filtration device is connected to the raw water supply pipe A and the second pipe 12 is connected to the drain discharge pipe B. . On the other hand, (B) shows a state in which the second pipe 12 is connected to the raw water supply pipe A and the first pipe 11 is connected to the drain discharge pipe B.

In the state shown in FIG. 8A, the raw water passes through the first pipe 11 and passes through the first chamber 1 of the outer case 1.
A flows into A. The raw water flowing into the first chamber 1A flows into the hollow portion of the internal pressure type hollow fiber membrane 32 from one end of the hollow fiber membrane module 3 through the opening 32a of the internal pressure type hollow fiber membrane 32.

When the drain valve B2 is throttled to apply pressure to the raw water, the raw water flowing into the hollow portion of the internal pressure type hollow fiber membrane 32 passes through the internal pressure type hollow fiber membrane 32,
It flows out into the space formed between 2 and the hollow fiber membrane case 31, and flows out through the filtered water outflow channel 31a to the third chamber 1C. The liquid flowing out to the third chamber 1C flows out to the filtered water supply pipe C through the third pipe 13. When the liquid permeates through the internal pressure type hollow fiber membrane 32, impurities to be removed such as bacteria and viruses are removed from the raw water. Therefore, impurities such as bacteria and viruses are contained from the third flow path. No filtered water flows out. On the other hand, the opening 3 of the internal pressure type hollow fiber membrane 32 on the side opposite to the opening 32a.
The concentrated water is discharged from 2b, and the concentrated water is discharged to the outside through the second pipe 12 and the drain discharge pipe B.

In the state shown in FIG. 8A, when the opening 32a of the hollow fiber membrane 32 is clogged with the fine particles in the raw water, the union joints A1 and B1 are loosened, and the raw water supply pipe A is connected to the first pipe. The channel 11 is removed, and the second channel 12 is removed from the drain discharge pipe B. Then, the outer case 1 is
Rotate 180 degrees around the rotation axes 15a and 15b.
As described above, the second pipeline 12 is rotationally symmetric with respect to the axis L with respect to the first pipeline 11, so that when the outer case is rotated by 180 ° from the state shown in FIG.
The end of the second pipe 12 faces the end of the raw water supply pipe A, and the end of the first pipe 11 faces the end of the drain discharge pipe B. On the other hand, the bent portion 13 in the third conduit 13 is
Since the outer case 1 is bent in accordance with the rotation, the rotation of the outer case 1 is not hindered. In this state, union joint A
1 and B1, the raw water supply pipe A and the second pipe 12
Is connected, and the drain discharge pipe B and the first pipeline 11 are connected. This state is shown in FIG.

In the state shown in FIG. 8B, the raw water supplied from the raw water supply pipe A flows into the first chamber 1A of the outer case 1 through the second pipe 12. The raw water flowing into the first chamber 1A flows from one end of the hollow fiber membrane module 3 through the opening 32b of the internal pressure type hollow fiber membrane 32 and into the hollow portion of the internal pressure type hollow fiber membrane 32. The raw water that has flowed into the hollow portion of the internal pressure type hollow fiber membrane 32 is (A)
As in the case of (1), the water is filtered by the internal pressure type hollow fiber membrane 32 and supplied to the water-supplied building through the third chamber 1C and the filtered water supply pipe C. On the other hand, the opening 32a of the internal pressure type hollow fiber membrane 32
Since the concentrated water is discharged from, fine particles that have closed the opening 32a are removed by the pressure of the concentrated water,
The condensed water is discharged outside through the first pipe 11 and the drain discharge pipe B. Thereby, the clogging of the opening 32a is eliminated.

[0096] By opening the drain valve B2,
The clogging of the opening 32a can be more efficiently eliminated.

[0097]

According to the hollow fiber membrane filtration device provided by the present invention, there is no problem that the piping provided in the filtration device having a plurality of hollow fiber membrane modules connected in parallel is complicated. When the hollow fiber membrane is clogged with fine particles in raw water, the performance can be easily recovered by back washing.

[0098] The hollow fiber membrane filtration device provided by the present invention can be used even when a larger throughput is required.
It has the feature that it can easily respond to this request.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one example of a hollow fiber membrane filtration device of the present invention.

[FIG. 2] FIG. 2 is a schematic explanatory view showing a cross section obtained by connecting a liquid lead-in / out path and a raw water supply path or a drain discharge path with a joint in an example of the hollow fiber membrane filtration device of the present invention.

FIG. 3 is a schematic explanatory view showing another example of the hollow fiber membrane filtration device of the present invention.

FIG. 4 is a longitudinal sectional view showing still another example of the hollow fiber membrane filtration device of the present invention.

FIG. 5 is a longitudinal sectional view showing the structure of a hollow fiber membrane module used in the hollow fiber membrane filtration device shown in FIG.

FIG. 6 is a schematic diagram showing a state in which the hollow fiber membrane filtration device shown in FIG. 4 is interposed in a water supply pipe.

FIG. 7 is a longitudinal sectional view showing another example of the hollow fiber membrane filtration device according to the present invention.

FIG. 8 is a schematic diagram showing a state where the hollow fiber membrane filtration device shown in FIG. 7 is interposed in a water supply pipe.

[Explanation of symbols]

1 ... outer case, 1A ... first room, 1B ... second room, 1C ...
3rd chamber, 2 ... first partition, 3 ... hollow fiber membrane module, 4 ...
2nd partition, 11 ... 1st pipeline, 12 ... 2nd pipeline, 13 ... 3rd pipeline, 13a ... watertight joint, 13b ... bending part, 13c ...
Rigid portion, 14: filtered water discharge conduit, 15a, 15b: rotating shaft, 16: bearing, 21: O-ring, 22: hollow fiber membrane module mounting port, 31: hollow fiber membrane case, 31a: filtered water outflow channel , 32 ... internal pressure type hollow fiber membrane, 32a, 32b ...
Openings, 33, 34 ... packing, 41 ... O-ring, 42
… Hollow fiber membrane module mounting port, 50… Case, 51… Raw water supply path, 52… Drain discharge path, 53… Liquid lead-in / out path, 5
4 ... flow path switching means, 55 ... first three-way switching valve, 5
6 ... second three-way switching valve, 57 ... third three-way switching valve,
58: fourth three-way switching valve, 59: first bypass, 60
... Second bypass, 311, 312 ... Potting part, A
... raw water supply pipe, A1: union joint, B: drain discharge pipe, B1: union joint, B2: drain valve, C: filtered water supply pipe, C1: union joint

Claims (7)

[Claims] A hollow fiber bundle is accommodated in a case having both ends opened, and both ends of the hollow fiber bundle are fixed at both ends of the case so that the ends of the hollow fibers forming the hollow fiber bundle are open. A hollow fiber membrane module that forms a filtered water outflow channel that discharges filtered water in the case; a raw water supply path that supplies raw water to one end of the hollow fiber membrane module; A drain discharge path for discharging the concentrated water, and a raw water supply path connected to one end of the hollow fiber membrane module are connected to the other end of the hollow fiber membrane module to which the drain discharge path is connected. A drain discharge path coupled to the other end of the fiber membrane module, and a switching means for switching a flow path so as to be coupled to one end of the hollow fiber membrane module to which the raw water supply path has been coupled. Hollow fiber membrane filtration device. 2. The raw water supply system according to claim 1, wherein a plurality of said hollow fiber membrane modules are used, said plurality of hollow fiber membrane modules are housed in an outer case, and said outer case allows liquid to flow in and out at one end. A first chamber, which is provided with a first liquid outlet port connectable to a passage or a drain discharge path, and a first chamber in which one end of the hollow fiber in each of the plurality of hollow fiber membrane modules is opened; A second chamber that is provided with a second liquid outlet that can be connected to the raw water supply path or the drain discharge path, and that is open at the other end of the hollow fiber in the plurality of hollow fiber membrane modules; The hollow fiber membrane filtration device according to claim 1, further comprising a filtered water outflow channel for taking out the filtered water flowing out. 3. The switching means rotates the outer case to connect the raw water supply path connected to the first liquid outlet to the drain discharge path, and to connect the drain connected to the second liquid outlet. The hollow fiber membrane filtration device according to claim 2, which is a means for connecting the discharge path to the raw water supply path. 4. The apparatus according to claim 1, wherein the switching means includes a first water supply passage.
A first three-way switching valve and a second three-way switching valve interposed sequentially toward the liquid outlet, a third three-way switching valve and a third interposed sequentially toward the second liquid outlet in the drain discharge path, A fourth switching valve, a first bypass connecting the first three-way switching valve and the fourth three-way switching valve, and a second bypass.
A second connecting the three-way switching valve and the third three-way switching valve
The hollow fiber membrane filtration device according to claim 2, further comprising a bypass. 5. A first flow path connected to one of a raw water supply pipe for supplying raw water and a drain discharge pipe for discharging concentrated water,
A first chamber having a second flow path connected to the other of the raw water supply pipe and the drain discharge pipe, and a third flow path for taking out filtered water to the outside, and having a first chamber provided with the first flow path inside; A first partition partitioning watertight into a third chamber having a third flow path; and a second partition partitioning the interior watertight into the third chamber and the second chamber having the second flow path. And a hollow fiber membrane that is open at both ends and filters raw water, and a filtered water outflow channel is provided on the side surface, wherein the hollow fiber membrane is housed inside and fixed at both ends. A hollow fiber membrane module housed inside the outer case, the hollow case being provided with a hollow fiber membrane case, the outer case being rotatably provided around an axis intersecting with the outer case, The flow path is rotationally symmetric about the axis with respect to the first flow path. In the hollow fiber membrane module, one end face faces the first chamber in the outer case, and the other end face faces the second chamber in the outer case, and the filtered water flow channel provided on the side face has A hollow fiber membrane filtration device characterized by being watertightly mounted on the first partition and the second partition so as to face a third chamber of the outer case. 6. The hollow fiber membrane filtration device according to claim 5, wherein the outer case according to the fifth aspect is an outer case formed to be rotatable with respect to the third flow path according to the fifth aspect. 7. The hollow fiber membrane filtration device according to claim 5, wherein the third flow path in the fifth aspect is a conduit having a freely bendable bent portion.