JPS6369504A - Membrane separator - Google Patents

Abstract

PURPOSE:To exchange only the separation membrane, by making a module shorter than the frame of a gasket, and forming a communicating part between a couple of both opposed end sides of the modules and both sides of the frame to hold both sides adjacent to both end sides with the gasket. CONSTITUTION:A supporting plate 34, over which a separation membrane 36 is laid, is made shorter than the frame to form adjacent communicating parts 42a and 42b between both sides 40a and 40b of the gasket 40 and both end sides 38a and 38b of the module 38, and both sides adjacent to both end sides 38a and 38b are held by the gasket 40. The modules 38 and the gaskets 40 are laminated to form the membrane separator. As a result, the adjacent liq. passages are communicated without making a through hole in the supporting plate and the separation membrane. Consequently, when the separation membrane is mounted and exchanged, the detachment of the supporting plate, a presser, etc., is not necessitated, and mounting and exchange can be easily and rapidly carried out. Besides, the sharp turn of the raw liq. passage is not formed on the supporting plate, and hence deposits are not generated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a membrane separation device, and more specifically, the method of attaching and detaching a separation membrane,
This invention relates to a membrane separation device commonly referred to as a flat membrane type (flat membrane type) that has been improved so that it can be easily replaced.

[Prior Art] Various flat membrane type membrane separation devices equipped with reverse osmosis membranes, ultrafiltration membranes, precision filtration membranes, etc. in the form of flat membranes are used in various industrial fields such as wastewater treatment and the food industry. This plain-clothes type membrane separator usually has two parts on both sides of the support plate. A membrane is pasted to form a separation membrane module, the modules are stacked via gaskets so that a liquid passage part is formed between each module, and a communication part is provided to communicate each liquid passage part with each other,
The support plate is provided with means for extracting the membrane permeate.

FIG. 2 is a longitudinal cross-sectional view showing an example of the configuration of a flat membrane type membrane separator. Reference numeral 10 denotes a support plate, which is a plate-shaped body through which a liquid can flow along its surface or through its interior. Both sides of this support plate 10 have minutes! ! ! An ltIIM (for example, an ultrafiltration membrane) 12 is attached to form one separation membrane module. The separation membrane module 14 is composed of the support plate 10 and the separation membrane 12, and the plurality of membranes have gaskets between them.
6, and a liquid passage part 18 is provided between each module 14.
is formed. A through hole 20 is formed in each support plate 10 and separation membrane 12, and adjacent liquid passage portions 18 are communicated with each other. Note that side plates 22 and 24 are provided on the outermost side of the stack of modules 14.

The side plates 22 and 24 are provided with an inlet 26 for the stock solution and an outlet 28 for the concentrated solution. Further, a permeate extraction pipe 30 is connected to each of the support plates 10 .

In the flat membrane membrane separator having such a configuration, the stock solution introduced into the device from the inlet 26 passes through the through hole 20 and sequentially passes through each liquid passage section 18, during which it is subjected to membrane permeation treatment by the separation membrane 12. receive. The permeated liquid is taken out of the apparatus through piping 30. In addition, the concentrated liquid is taken out of the device from the outlet 28, and is circulated again to the inlet 26 as needed to refill the ash B! Receive A burial.

Figures 3 and 4 respectively show conventional separation membrane module 1.
FIG. 4 is a plan view showing the configuration of No. 4;

The separation membrane module 14a shown in FIG. 3 has an elliptical support plate 10a, and the separation membrane 12a also has an ellipse shape. Two through holes 20 passing through the support plate XOa and the separation membrane 12a are provided on the long axis side of the ellipse.

The separation membrane module 14b shown in FIG. 4 has a rectangular support plate 10b, and the separation membrane 12b also has a rectangular shape that matches this support plate tab.

A total of four through holes 20 are provided in each of the support plate 10b and the membrane 12b. In addition, the gaskets 16a and 16 are indicated by two-dot chain lines in FIGS. 3 and 4.
b, each having a frame-shaped frame portion extending along the periphery of the separation membrane modules f4a and 14b, and a liquid passage portion can be formed inside the frame portion.

FIG. 5 is a schematic cross-sectional view showing the stacked structure of a conventional separation membrane module. As shown, the separation membrane module 14
A gasket 16 is interposed between them, and a liquid passage section 18 is formed between the separation membranes 12 of each separation membrane module 14, which is a space opened by the thickness of the gasket 16.

FIG. 6 is a vertical cross-sectional view illustrating a conventional installation structure of the through hole 20. As mentioned above, the conventional through hole 20 is
0 and the separation membrane 12, and a presser 32 is provided to bring the support plate 10 and the separation membrane 12 into close contact at the opening edge of the through hole. This holding tool 32 has a substantially cylindrical shape, and is provided with flange portions 32a and 32b on both ends in the direction of the sleeve. The structure is such that they are sandwiched and brought into close contact.

[Problems to be Solved by the Invention] As described above, in the conventional flat membrane type membrane separator, the through hole 20 is provided through the support plate 10 and the separation membrane 12, and the opening edge of the through hole The structure is such that the support plate 10 and the separation membrane 12 are brought into close contact by pressing the support plate 10 with a presser 32. Therefore, in order to replace the separation membrane, it is necessary to disassemble the membrane separation device (open the frame), remove the support plate, and remove the holding tool 32, which requires a lot of effort. . Additionally, if the holding tool 32 is improperly attached, there is a problem in that the separation membrane is likely to peel off from the edge of the through hole during operation of the membrane separation device, causing the stock solution to leak from there to the permeate side. .

The present applicant proposed a membrane separation device in which a U-shaped liquid passageway was formed on the plate surface of a support plate in Japanese Patent Application No. 3302/1983, but in the device of this earlier application, the flow of the liquid liquid was Improvement issues were found in that because the path curves sharply, flow stagnation occurs, and fine particles (for example, fibers) tend to accumulate due to reasons such as the action of centrifugal force.

[Means for Solving the Problems] The flat membrane type membrane separator of the present invention has separation membranes attached to both surfaces of a support plate to form a separation membrane module, and this module is connected to a gasket having a frame. In this module, the module is stacked so that a liquid passage part is formed between each module through the membrane, a communication part is provided to communicate the liquid passage parts with each other, and a means for taking out the membrane permeate is provided on the support plate. We adopt the one formed as follows.

The module has a length shorter than the frame so that a communicating part for communicating the liquid passage parts is formed between a pair of opposing end sides of the module and both sides of the frame of the gasket.

Further, both sides of the module adjacent to the both end sides are held by the gasket.

[Function] In the module used in the membrane separation device of the present invention, adjacent liquid passage portions are communicated with each other without forming any through holes in the support plate and the membrane 111i. Therefore, there is no need for complicated operations such as removing a support plate and a presser when installing or replacing a separation membrane, and the separation membrane can be installed or replaced extremely easily and quickly. Moreover, since there is no possibility of improper attachment of the presser, the situation in which the stock solution flows into the permeate side from the presser is also eliminated.

In addition, in the membrane separation device of the present invention, there is no place where the flow of the stock solution on the support plate suddenly changes, and no precipitate is generated. Furthermore, almost the entire area of the membrane surface can be used for membrane separation processing.

[Examples] The present invention will be described in more detail below with reference to examples shown in the drawings.

1 and 7 are a plan view and a perspective view of a separation membrane module used in a membrane separation device according to an embodiment of the present invention,
Figures 8 and 9 are the ■-■ line and IX-I in Figure 7, respectively.
FIG. 3 is a cross-sectional view taken along the X-ray. Moreover, FIG. 10 is an explanatory diagram of the assembly of the module and the gasket.

First, the configuration of the separation membrane module used in the apparatus of this embodiment will be explained.

Reference numeral 34 denotes a support plate, which extends around both end sides 34a. tlj36 is attached to both surfaces of the support plate 34. The device of this embodiment has such a support plate 34.
A plurality of modules 38 each made of a gasket 40 and a separation membrane 36 are mounted on a gasket 40 and stacked. This gasket 40 has an elliptical shape that goes around the four peripheries of the module 38.

The support plate 34 described above has both sides 40a of the gasket 40,
The length is shorter than the frame portion so as to form adjacent communicating portions 42a, 42b between the module 40b and both end sides 38a, 38b of the module 38.

As shown in FIG. 8, the module 38 has both sides 38a,
Both sides adjacent to 38b are held by gaskets 40. The gasket 40 is made of a plastic material such as rubber, and has long grooves formed in its inner peripheral surface to receive both sides of the module 38, and the module 38 is fitted into the gasket 40 as shown in FIG. Note that the gasket 40 includes
A reinforcing material 40e is embedded along the outer circumference to increase its strength.

As shown in FIG. 9, a groove extending in the width direction is formed on the surface of the support plate 34, and this groove is connected to a permeated water passage of the gasket 40 through a communication hole 34c formed in the support plate 34. 40c. Reference numeral 34d indicates a nozzle that protrudes from the side of the support plate, and is inserted into the permeated water so as to reach the inside of the passage 40c.

Also, a permeated water extraction hole 40 communicating with the permeated water passage 40c
d is provided through the gasket 40 in the thickness direction.

Module 38 and gasket 4 configured in this way
A membrane separation device is constructed by stacking the combinations of 0 as shown in FIG. In this case, the raw water flows through the communication sections 42a and 42b in each combination, and along the way, it passes between the plate surfaces of each module 38 (liquid passage section) and undergoes component tin treatment. Permeated water flows through the communication hole 3401 passage 40
c, it reaches the extraction hole 40d, and is extracted out of the device.

FIG. 11 shows the module 38 of the above embodiment having a half-cylindrical cover 3 on both sides 38a and 38b.
A module provided with 8A and 38B is shown. In this case, both sides 34a (or 34b) of the support plate 34, the membrane 36, and the cover 38A (or 38B) may be bonded together with an adhesive.

12 and 13 show another embodiment of the present invention, in which a partition 44 is provided integrally with the gasket 40, and raw water passages (communicating portions 42a, 4
A combination of a gasket 41 and a module 38 is shown in which the gasket 41 and the module 38 are divided into two. Note that the configuration is the same as above except for the provision of the partition 44, and the same parts are given the same reference numerals and the explanation thereof will be omitted.

As shown in Figure 14.15, such a gasket 41
A flat membrane type membrane separation device is constructed by stacking a plurality of modules 38 via the laminate 59 and bringing the side plates 46, 48 into close contact with the outermost side of the stack 59. In the present invention, the flat membrane type membrane separator between the side plates 46 and 48 may be used as one unit, and a plurality of units may be connected in a stacked manner. When a plurality of units are stacked and connected, each unit may be partitioned by one plate 49.

The side plate 46 has a raw water inlet 50 and a permeated water outlet 5.
2 and a concentrated liquid outlet (not shown) are respectively provided. The inlet 50 communicates with one of the two communication parts 42a and 42b, and the concentrated liquid outlet communicates with the other of the two communication parts. Further, the permeate water extraction port 52 is communicated with the extraction hole 40d. The side plate 48 has communication parts divided into two parts by the partition part 44 (in FIG.
b) A recess 48a is bored through it.

In the membrane separation apparatus according to the embodiment configured as described above, the stock solution is introduced into the apparatus through the introduction port 50. The introduced stock solution flows along both plate surfaces of each module 38, as shown in FIG. 15, and is further supplied to the adjacent module 38 through the opening 49a of the partition plate 49.

The stock solution that has reached the liquid passage portion 42b adjacent to the side plate 48 in this way is then reversed in flow direction at the recess 48a, and similarly flows along the plate surface of each module 38.
Eventually it reaches the side plate 46, is taken out of the device from the concentrate outlet, and is recycled as necessary. While the undiluted solution passes through the device, the undiluted solution is subjected to membrane separation treatment, and the permeated liquid is passed through the grooves formed between the support plate 34 and the separation membrane 36, the communication hole 34c, the passage 40c, and the extraction hole. 40d, reaches the discharge port 52, and is taken out of the apparatus.

14.15 shows a membrane separation device that employs the gasket 41 shown in FIG. 12.13, but when the gasket 40 shown in FIG. 1 is used, the module 38 shown in FIG. A laminate 60% 61 formed by laminating a combination of the gasket 40 and the gasket 40 may be arranged in a stacked manner. In this case, the liquid passage parts 42a, b of the laminate 60 are used as built-in channels, and the liquid passage parts 42a, b of the laminate 61 are used as rearward passages to flow the stock solution, so that the apparatus shown in FIG. 14.15 can be used. It can be operated in exactly the same way.

FIG. 18 is a sectional view showing an example of a different shape of the gasket 40 (or 41). In this Fig. 18, gasket 4
A convex step is provided on one side of the edge of gasket 0 or 41, and a concave step is provided on the other side, so that adjacent gaskets 40.4
The convex and concave step portions of the same length are engaged with each other. This improves the sealing properties of the gasket.

In addition, in the above examples, all gaskets)・40.4
1, it has a rounded and gently curved shape in plan view, but this has the effect of dispersing stress even if high pressure water is introduced inside.

In the present invention, various types of separation membranes can be used, such as reverse osmosis membranes, ultrafiltration membranes, and semi@filtration membranes, and may be selected depending on the purpose of separation.

Further, in the present invention, in addition to such a thin-film-like soft organic separation membrane, the separation membrane may be made of an inorganic rigid material such as porous sintered metal or ceramic.

In this case, it is sufficient to process and form the belt into an endless belt shape in advance and fit it onto the support plate.

[Effects of the Invention] As is clear from the above description, in the membrane separation apparatus of the present invention, the support plate and the membrane can be removed individually and only the separation membrane can be replaced, and the work of removing the presser etc. when attaching the membrane is required. Since this is not necessary, attachment/detachment and replacement of the membrane can be done extremely easily and quickly. In addition, if the performance deteriorates due to contamination during operation of the apparatus, or if the minute st@ is damaged during operation of the apparatus, only the minute* membrane can be quickly replaced, which is extremely economical. In addition, in the present invention, there is no need for the conventionally used presser to hold the support plate and the separation membrane in close contact with each other, so there is no leakage of the stock solution to the permeate side due to improper attachment of the presser. It is also possible to maintain the permeate water quality.

Furthermore, in the present invention, since there is no sudden change in the flow direction in the flow path of the stock solution, the flow path is prevented from being blocked by deposits, and stable operation is possible over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating the module and gasket of an embodiment of the present invention, FIG. 2 is a schematic vertical sectional view showing the configuration of a conventional flat membrane separation device, and FIGS. 3 and 4 is a plan view showing a conventional separation membrane module, FIG. 5 is a sectional view explaining the laminated structure in a conventional membrane separation device, FIG. 6 is an enlarged sectional view of the main part of the conventional device, and FIG. S7 is a diagram used in the example device. The perspective view of the separation membrane module shown in FIG. 8 and FIG. 9 are cross-sectional views taken along the line ■-■ and the line IX-IX in FIG. 1, respectively. 10 is an explanatory diagram of the assembly of a module and a gasket, FIG. 11 is a sectional view of a module according to another embodiment, FIG. 12 is a plan view of a module and a gasket according to another embodiment, and FIG. 12 is a sectional view taken along the line ■-■, FIG. 14 is a perspective view of the main parts of the embodiment device, and FIG. 15 is a
4, FIG. 16 is a partial perspective view of the side plate 48, FIG. 17 is a perspective view of main parts of another example device, and FIG.
The figures are cross-sectional views showing different examples of gaskets. 34... Support plate, 36... Separation membrane, 4
0.41... Gasket, 42a, 42b... Communication portion, 44... Partition. Agent Patent Attorney Tsuyoshi Shigeno Figure 1 = Figure 2 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Hammer Figure 17 Figure 18

Claims (1)

[Claims] (1) Separation membranes are pasted on both sides of the support plate to form a separation membrane module, and these modules are stacked so that a liquid passage is formed between each module via a gasket with a frame. In the membrane separation device, the module is provided with a communication part that communicates the liquid passage parts with each other, and a means for taking out the membrane permeate liquid on the support plate, in which the module has a pair of opposite end sides of the module and a The module has a length shorter than the frame so as to form the communication section with both sides of the frame of the gasket, and both sides adjacent to the end sides of the module are held by the gasket. membrane separation equipment.