JPH057740A - Multistage hollow yarn membrane module-connected body and filter using the same - Google Patents

Abstract

PURPOSE:To dispense with the fixing metal jig connecting a plurality of hollow yarn membrane modules and to improve handling properties and transport properties by providing the hollow yarn membrane modules in the outer cylinder for inserting the hollow yarn membrane modules provided to the connected body so that said modules are superposed one upon another in up-and-down relation. CONSTITUTION:A plurality of hollow yarn membrane modules 42 each formed by bonding and fixing hollow yarn membranes and a plurality of rods 43 to end members 36 are inserted in a hollow yarn membrane module inserting outer cylinder 46. An end member 31 for hanging a filter container from a partition plate is fixed to the upper end of the outer cylinder 46 and a cap 47 is fixed to the lower end of the outer cylinder 46. Spacers 45 preventing the direct contact of the end members 36 are provided between the cap 47 and the modules 42 and between the modules 42, and the space parts of the spacers 45 are used as water gathering chambers. As a result, since the bonded body of the modules is equipped with the outer cylinder 46, the fixing metal jig connecting the modules becomes unnecessary and, since the outer cylinder 46 also plays the role of the protection of the hollow yarn membranes 40, handling properties and transport properties are improved.

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 type filtration device having a plurality of hollow fiber membrane modules in a container for filtering a stock solution, and more particularly to a hollow fiber membrane module insertion outer cylinder. Then, a multi-stage hollow fiber membrane module assembly in which a plurality of hollow fiber membrane modules are provided in a multi-tiered manner in the outer cylinder,
Also, the present invention relates to a filter container equipped with an air guide tube for backwashing the multistage hollow fiber membrane module.

[0002]

2. Description of the Related Art For example, as a filtering device used for separating and removing a condensate existing in a condensate or a radioactive liquid waste in a nuclear power plant, conventionally, a filter element such as a powder ion exchange resin is precoated on a filter element. However, a precoat type filtration device that separates and removes suspended matter with a filter aid precoat layer has been adopted, but in recent plants, a hollow fiber membrane type filtration device that does not use a filter aid has been adopted. Came.

FIG. 4 shows a schematic structure around a filter of a conventional hollow fiber membrane type filtering device. A plurality of hollow fiber membrane module combinations 5 are suspended from a partition plate 3 sandwiched between a body container 1 and a lid container 2 and fixed by a holding plate 4. The undiluted solution that needs to be filtered is guided through the undiluted solution inlet valve 11 and undiluted solution inlet tube 12 to the barrel container 1 and is filtered with the hollow fiber membranes bundled in the hollow fiber membrane module of the hollow fiber membrane module assembly 5. Then, the lid container 2 is passed through the inside of the hollow fiber membrane.
It is collected inside and is sent to the downstream system via the processing liquid outlet pipe 13 and the processing liquid outlet valve 14. When the amount of the suspension captured by the hollow fiber membrane and attached to the outside of the hollow fiber membrane reaches a specified amount, the hollow fiber membrane is backwashed. Backwashing of the hollow fiber membrane is performed by the lower air inlet valve 1
5. Low-pressure air backwash that vibrates the hollow fiber membrane by low-pressure air supplied from the lower air inlet pipe 16 to remove suspended matter, and high-pressure air supplied from the upper air inlet valve 19 and the upper air inlet pipe 20. There is a high-pressure air backwash in which the treatment liquid held in the lid container 2 is pressure-fed and backwashed from the inside to the outside of the hollow fiber membrane, and the suspension captured by the hollow fiber membrane is removed by one or both of these. Remove. The air used for this backwash is exhausted through the vent pipe and the vent valve 18, and the liquid retained in the barrel container 1 containing the suspension is drain pipe 2
1, discharged through the drain valve 22.

FIG. 5 shows the structure of a conventional example of a hollow fiber membrane module assembly 5 for performing a filtration treatment of a stock solution.
The hollow fiber membrane module assembly 5 is a hollow fiber membrane in which both ends of the water intake pipe 35 are fixed to the end members 31 or 36 in an open state, and linear pores are formed around the water intake pipe 35 on the outer periphery thereof. A large number of 40 are arranged and the end members 31 or 36
A plurality (two in FIG. 5) of hollow fiber membrane modules 41 configured to be bonded and fixed to the end of the hollow fiber membrane module 41 are arranged at appropriate intervals in the vertical direction, and the end members 36 and 3 of the adjacent hollow fiber membrane modules 41 are arranged.
6 is connected by the fixing metal fitting 33, and the fixing metal fitting 34 is connected to the lowermost end member 36. The end member 31 at the uppermost end of the hollow fiber membrane module assembly 5 forms a wide end so as to be connected to the partition plate 3, and the sealing material 32 is provided between the end member 31 and the partition plate 3. The stock solution and the processing solution are provided so as not to mix.

Next, the filtering action of the hollow fiber membrane module assembly 5 will be described. The undiluted solution is guided to the outside of the hollow fiber membrane 40, only the treatment solution of the undiluted solution permeates into the inside of the hollow fiber membrane 40 through the micropores, and the suspension is solidified by being trapped on the surface of the hollow fiber membrane 40. -Separate the liquid. Hollow fiber membrane 40
The treatment liquid that has penetrated into the inside of the hollow fiber membrane 40 flows through the hollow portion of the hollow fiber membrane 40 into the space inside the fixing metal fittings 33 and 34, and the intake pipe 3
It is guided to the upper side of the end member 31 through 5.

The assembly of the hollow fiber membrane module assembly 5 is carried out when it is suspended on the partition plate 3, and after the fixing metal fitting 34 at the lowermost end of the hollow fiber membrane module 41 is connected, the hollow fiber membrane module 41 is connected. The fixing metal fittings 33 are connected to each other. In addition, the hollow fiber membrane module 4
When transporting No. 1, a special transport container was required to protect the hollow fiber membrane.

A device related to this type of hollow fiber membrane type filtration device is disclosed in, for example, Japanese Patent Application Laid-Open No. 60-2064.
No. 05 etc. are raised.

[0008]

The hollow fiber membrane module assembly of the above-mentioned prior art is hollow because it does not have an outer structural member for protecting the hollow fiber membranes and for holding the hollow fiber membrane modules together. There was a problem such as breakage of the hollow fiber membrane and yarn breakage due to an external action because there was work such as connecting with a fixing metal fitting when handling the fiber membrane module. In addition, since a special transportation container is required even during transportation, when the hollow fiber membrane filtration device is installed in a radiation-controlled building such as a nuclear power plant, the container placement location in the building, Carrying in and out of the building was a problem.

An object of the present invention is to solve the problems in handling and transporting a hollow fiber membrane module assembly formed by vertically connecting a plurality of hollow fiber membrane modules and protecting the hollow fiber membranes. It is a thing.

[0010]

The hollow fiber membrane module assembly of the present invention has an outer cylinder for inserting a hollow fiber membrane module, and a plurality of hollow fiber membrane modules are vertically stacked and inserted into the outer cylinder. Hold to form a multi-stage hollow fiber membrane module assembly. As a result, the outer cylinder for inserting the hollow fiber membrane module serves both to protect the hollow fiber membrane and to hold the hollow fiber membrane modules.

It is also preferable to insert a spacer at the boundary between the hollow fiber membrane modules in order to prevent contact between the ends of the hollow fiber membrane modules and to provide a water collecting chamber. Furthermore, in order to prevent deformation of the hollow fiber membrane module, it is preferable to provide a tubular body having a plurality of rods or a large number of holes in the hollow fiber membrane module insertion outer cylinder.

Further, since the multistage hollow fiber membrane module assembly has the above-mentioned outer cylinder for inserting the hollow fiber membrane module, the backwashability may be deteriorated. Therefore, according to the present invention, a filter is provided. The partition plate in the container was provided with an air guide tube for backwashing the hollow fiber membrane module.

[0013]

The hollow cylinder for inserting the hollow fiber membrane module not only serves as a guide for the hollow fiber membrane module but also has a role of protecting the hollow fiber membrane and a role of holding the hollow fiber membrane modules, and is provided in the outer cylinder. The plurality of holes also serve as holes for introducing the stock solution and the air for backwashing. Further, the spacer provided on the boundary surface of the hollow fiber membrane module not only prevents the hollow fiber membrane modules from contacting each other, but also acts as a water collecting chamber. This protects the hollow fiber membranes in the multi-stage hollow fiber membrane module assembly, introduces the undiluted solution into each hollow fiber membrane module, and the treatment solution filtered by the hollow fiber membranes joins the multi-stage hollow fiber membrane module combination. Can be collected at the top of the body.

The hollow fiber membrane module backwashing air guide tube provided on the partition plate of the filter container acts to guide low-pressure air into the multistage hollow fiber membrane module assembly, and at the same time, the stock solution is multistage hollow. It also acts to guide it into the membrane module assembly.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This example has the same function as that of the above-mentioned conventional example in that the stock solution is filtered through the hollow fiber membrane to remove the suspended matter, and the configuration around the filter of the hollow fiber membrane type filtration device is also the same. There is no change. That is, in this embodiment, as in the above-described conventional example, as shown in FIG. 4, the hollow fiber membrane module assembly has a partition plate 3 sandwiched between a body container 1 and a lid container 2 and a hollow fiber membrane of the conventional example. A plurality of modules are suspended in the same manner as the module assembly 5, and are fixed by the holding plate 4. The stock solution is introduced into the barrel container 1 via the stock solution inlet valve 11 and the stock solution inlet pipe 12 and filtered by the hollow fiber membrane in the hollow fiber membrane module assembly. The processing liquid is collected in the lid container 2 and is sent to the downstream system through the processing liquid outlet pipe 13 and the processing liquid outlet valve 14. The backwashing of the hollow fiber membrane is performed by low pressure air backwashing with low pressure air supplied from the lower air inlet valve 15 and the lower air inlet pipe 16 and high pressure air supplied from the upper air inlet valve 19 and the upper air inlet pipe 20. High pressure air backwashing is performed, the air is discharged through the vent pipe 17 and the vent valve 18, and the retained liquid in the container is discharged through the drain pipe 21 and the drain valve 22.

The present embodiment is different from the conventional one in the structure of the hollow fiber membrane module assembly, and the hollow fiber membrane module assembly is referred to as a multi-stage hollow fiber membrane module assembly.

FIG. 1 shows the structure of a multistage hollow fiber membrane module assembly in this embodiment. This multi-stage type hollow fiber membrane module assembly has a hollow fiber membrane module insertion outer cylinder 46 in which an end member 36 includes a hollow fiber membrane 40 having a plurality of fine holes in a linear shape and an outer periphery thereof and a plurality of rods 43. A plurality of hollow fiber membrane modules 42 (two in FIG. 1) are fixed in the vertical direction. Here, the plurality of rods 43 installed in the hollow fiber membrane module 42 prevent the hollow fiber membrane module 42 from being deformed.

The outer cylinder 46 for inserting the hollow fiber membrane module has a large number of undiluted liquid and air introduction holes 46 ', and a cap 47 is adhesively fixed to the lowermost portion. Each hollow fiber membrane module 42 is attached to the outer cylinder 46 for inserting the hollow fiber membrane module 42.
Insert. At this time, a short cylindrical spacer 45 is inserted at the boundary between the lowermost part and the hollow fiber membrane module 42,
The upper end and the lower end of each hollow fiber membrane module 42 are prevented from coming into contact with the cap 47 or the end portion of the counterpart hollow fiber membrane module 42. Further, an annular sealing material 44 is provided between the spacer 45 and the cap 47 and the end member 36 of the hollow fiber membrane module 42 to prevent the stock solution and the processing solution from mixing. In addition, the uppermost end of this multi-stage hollow fiber membrane module assembly is for attaching to the partition plate 3 and for fixing the hollow fiber membrane module 42 and the spacer 45 in the outer cylinder 46 for inserting the hollow fiber membrane module. The end member 31 of 1 is adhered and fixed to the outer tube 46 for inserting a hollow fiber membrane. A sealing material 32 is provided on the end member 31 of this multistage hollow fiber membrane module assembly, and this sealing material 32 prevents the stock solution and the processing solution from mixing in the same manner as in FIG.

As described above, the multi-stage hollow fiber membrane module assembly of this embodiment has the outer tube 4 for inserting the hollow fiber membrane module.
6 and a plurality of hollow fiber membrane modules 42 inserted therein
Further, it is composed of a spacer 45 and a sealing material 44 for the end member 36 thereof, and an upper end member 31 and a lower end cap 47 fixed to the outer cylinder 46.

Next, the filtration treatment and backwashing of the above-mentioned multistage hollow fiber membrane module assembly will be described. FIG. 2 shows a state in which the multistage hollow fiber membrane module assembly of FIG. 1 is attached to the partition plate 3 of the filter container. The partition plate 3 of the container of the filter is provided with a backwashing air guide tube 50. The multistage hollow fiber membrane module assembly shown in FIG.
It is inserted into 0 and is hung from the partition plate 3 by its end member 31, and the stock solution and the processing solution are prevented from being mixed by the sealing material 32, and fixed by the holding plate 4. The undiluted solution containing the suspension is introduced from the lower part of the backwashing air guide tube 50, and the plurality of holes 4 formed in the outer cylinder 46 for inserting the hollow fiber membrane module.
6 ', and is guided to the hollow fiber membrane module 42. The undiluted solution introduced into the hollow fiber membrane module 42 permeates only the treatment solution from the outside of the hollow fiber membrane 40 through the fine pores into the inside of the hollow fiber membrane 40, and the suspension is captured on the surface of the hollow fiber membrane 40. To be done. The treatment liquid that has penetrated into the hollow fiber membrane 40 is
Through the hollow part of the spacer 45 and collected in the water collecting chamber formed in the space part of the spacer 45, and is guided to the upper part of the end member 31 through the hollow part of the hollow fiber membrane 40 in the hollow fiber membrane module 42 in the upper stage. .

After trapping a specified amount of the suspension on the surface of the hollow fiber membrane 40 in this manner, the hollow fiber membrane 40 is backwashed. In the case of low-pressure air backwashing, the low-pressure air is guided from the lower part of the backwashing air guide tube 50, passes through a plurality of holes 46 ′ formed in the hollow fiber membrane module insertion outer cylinder 46, and inside the hollow fiber membrane module 42. After vibrating the hollow fiber membrane 40, the hollow fiber membrane module insertion outer cylinder 46 passes through the upper hole 46 ′ and returns to the backwashing air guide tube 50 again. It is discharged from the plurality of holes 50 '. The suspension trapped on the surface of the hollow fiber membrane 40 is removed by the vibration of the air. In the case of backwashing with high-pressure air, the treatment liquid in the lid container 2 is pressurized with high-pressure air from above, and the treatment liquid is pressurized with the end member 31.
Is put in from the upper part of the hollow fiber membrane 40 to flow backward from the inner surface to the outer surface of the hollow fiber membrane 40 to remove the suspension trapped on the surface of the hollow fiber membrane 40.

In the present embodiment, a plurality of hollow fiber membrane modules 42 are vertically stacked in an outer cylinder 46 for inserting a hollow fiber membrane module to form a multi-stage hollow fiber membrane module assembly. Outer cylinder 46 for inserting hollow fiber membrane module
Has a function of protecting the hollow fiber membranes 40 in the hollow fiber membrane module 42 and holding the hollow fiber membrane modules in a certain mutual relation, there is no connection work by a fixing metal fitting when handling the hollow fiber membrane module, Since the work can be easily performed without touching the fiber membrane 40, and a special transport container is not required even during transportation, a hollow fiber membrane filtration device like a nuclear power plant is used in a radiation-controlled building. Even when installed, it has the effect of improving work efficiency such as carrying in and out of the building.

FIG. 3 shows another embodiment of the present invention, in which a hollow cylindrical body 53 is provided on the hollow fiber membrane module side in addition to the hollow cylinder 46 for inserting the hollow fiber membrane module. The hollow bodies 53 prevent the hollow fiber membrane module 52 from being deformed. That is, each hollow fiber membrane module 52 is
Cylindrical body 53 having a plurality of holes 53 '(or mesh)
The tubular body 53 is bonded and fixed to the end member 36 together with the hollow fiber membrane 40. This hollow fiber membrane module 5
A plurality of hollow fibers 2 are vertically inserted in the hollow fiber membrane module insertion outer cylinder 46.

[0024]

EFFECTS OF THE INVENTION The multi-stage hollow fiber membrane module assembly of the present invention has an outer cylinder for inserting a hollow fiber membrane module, in which a plurality of hollow fiber membrane modules are vertically stacked on each other. This eliminates the need for fixing metal fittings that connect the hollow fiber membrane modules, and the hollow fiber membrane module insertion outer cylinder has a role of protecting the hollow fiber membranes and a role of holding the hollow fiber membrane modules. In terms of transportation, work can be facilitated and efficiency can be improved.

The deterioration of the backwashing property due to the adoption of the outer cylinder for inserting the hollow fiber membrane module can be solved by providing a backwashing air guide tube on the filter container side.

[Brief description of drawings]

FIG. 1 is a multistage hollow fiber membrane module assembly 1 according to the present invention.
Vertical cross-sectional view of the embodiment

FIG. 2 is a cross-sectional view showing a state in which the combined body of the multistage hollow fiber membrane module of FIG. 1 is attached to a partition plate of a filter container.

FIG. 3 is a vertical cross-sectional view of another embodiment of the multistage hollow fiber membrane module assembly of the present invention.

FIG. 4 is a schematic configuration diagram around a filter of a hollow fiber membrane type filtration device.

FIG. 5 is a cross-sectional view showing the structure of a conventional hollow fiber membrane module assembly and a state in which it is attached to a partition plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body container 2 ... Lid container 3 ... Partition plate 4 ... Holding plate 5 ... Hollow fiber membrane module combination 31 ... End member 32 ... Seal material 36 ... End member 40 ... Hollow fiber membrane 41 ... Conventional hollow fiber membrane module 42 ... Hollow fiber membrane module 43 of the present invention 43 ... Rod 44 ... Sealing material 45 ... Spacer 46 ... Outer cylinder for inserting hollow fiber membrane module 47 ... Cap 50 ... Air guide tube for backwashing

Claims (4)

[Claims] 1. A multi-stage hollow fiber membrane module assembly suspended from a partition plate in the container for partitioning the inside of a filter container into a raw solution side and a processing solution side, the hollow fiber having a large number of holes. An outer cylinder for inserting a membrane module, a plurality of hollow fiber membrane modules arranged vertically in the outer cylinder, an upper end member fixed to the upper end of the outer cylinder and suspended on the partition plate, A multistage hollow fiber membrane module assembly comprising a cap fixed to the lower end of an outer cylinder. 2. A spacer is inserted into a boundary portion between the hollow fiber membrane module and the hollow fiber membrane module arranged in the outer cylinder for inserting the hollow fiber membrane module, and a treatment liquid collecting chamber is formed therein. The multi-stage hollow fiber membrane module assembly according to claim 1, which is characterized in that. 3. In order to prevent the deformation of the hollow fiber membrane module, a plurality of rods connecting the upper end and the lower end of the hollow fiber membrane module or a tubular body with a large number of holes is used as an outer cylinder for inserting the hollow fiber membrane module. The multistage hollow fiber membrane module assembly according to claim 1, wherein the multistage hollow fiber membrane module assembly is contained. 4. The multi-stage hollow fiber membrane module according to claim 1, wherein the filter container has a partition plate for partitioning the inside of the filter container into a raw liquid side and a treatment liquid side, and the partition plate. A hollow fiber membrane filter, characterized in that a combined body is suspended and an air guide tube for backwashing a hollow fiber membrane module is provided on the partition plate so as to surround the multistage hollow fiber membrane module combined body.