JPH0630261Y2 - Liquid membrane separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a liquid separation device using a membrane such as a microfiltration membrane, an ultrafiltration membrane, or a reverse osmosis membrane. The present invention relates to a membrane separation device suitable for treating liquids containing the same.

<Prior Art> A hollow fiber type, a tubular type, a spiral type, and a pressure plate type (filter press type) have been mainly used as a membrane module for liquid separation using a membrane as described above.
Each of these membrane modules has merits and demerits and must be used properly according to the purpose of use, but the structure is generally complicated, so suspended substances in the liquid to be treated adhere to the membrane surface and the separation performance However, if the value decreases, it is extremely difficult to effectively clean the membrane surface with a simple operation. That is, when these membranes are conventionally contaminated with suspended substances in the liquid to be treated,
For example, complicated cleaning operations such as chemical cleaning using chemicals and ball cleaning using sponge balls are required, and the cleaning effect is not always satisfactory. Therefore, it has been conventionally considered very difficult to directly treat a liquid to be treated containing a relatively large amount of suspended matter with the membrane module as described above.

As a means for solving these problems, a membrane set is formed by laminating a plurality of membrane sheets formed into a bag shape with separation membranes such as microfiltration membranes, ultrafiltration membranes, and reverse osmosis membranes. A membrane separator having a structure in which a set is housed in a tank (or container) has been proposed.

An example of a membrane set used in such a membrane separation device is
A description will be given based on FIGS. 4 and 5. FIG. 4 is a longitudinal sectional view in the longitudinal direction of the membrane set 1 formed by laminating a plurality of rectangular membrane sheets 2, and FIG. 5 is a plan view of FIG. The membrane sheet 2 has substantially the same rectangular shape as that of the membrane sheet 2, and is a flat support 3 that can serve as a passage for permeate.
It is formed by enclosing (for example, a polymer net, a porous woven fabric or a non-woven fabric) in a bag shape with two sheet-shaped separation membranes 4a and 4b, and the peripheral edge of each separation membrane 4 is adhered, for example. The support 3 is sealed in a bag by bonding with a chemical or the like. The separation membranes 4a and 4b of the membrane sheet 2 are provided with holes 5 at arbitrary positions (right ends in the drawing) on the respective membrane surfaces, and the support 3 is also provided at positions corresponding to the holes 5 formed in the separation membrane 4. A similar hole is formed in. When the support body 3 is a net, the eyes of the net may be positioned instead of forming the holes.

A plurality of the above-mentioned membrane sheets 2 are inserted into the respective holes (the holes 5 formed in the separation membrane 4 and the holes formed in the support 3) and the respective membrane sheets 2 are joined together. 4 and 5 are fixed by stacking them with a certain distance between them.
The membrane set as shown is constructed. One end of the water intake pipe 6 is sealed with a blind flange 7, and the permeated liquid collected inside the membrane sheet 2 is taken out from the other end of the water intake pipe 6 to the outside of the membrane sheet 2. Has a permeated liquid outlet 8 communicating with the inside of the membrane sheet 2 corresponding to the hole 5 formed in each membrane sheet 2.
In addition, packing 9 is provided around the water intake pipe 6 between the membrane sheets 2.
Is provided to prevent the permeated liquid from flowing out of the membrane sheet 2 and the liquid to be treated from flowing into the membrane sheet 2. By contacting the outer surface of the uppermost layer of the laminated membrane sheet 2 group in this manner, for example, by screwing the flange 10 having the female screw hole into the water pipe 6, the laminated membrane sheet 2 group and the flange 10 and It is fixed with the blind flange 7 and the seal by the packing 9 is ensured. It is to be noted that, for example, a polymer net having a coarse mesh may be arranged on the uppermost layer and the lowermost layer of the laminated membrane sheet 2 group to sandwich the entire membrane sheet group 2, or a similar net may be provided between the membrane sheets 2. It may be interposed.

The membrane set 1 having the above-described structure is used by directly immersing it in the bath 11 containing the liquid to be treated, as shown in FIG. 6, for example. That is, when membrane separation of the liquid to be treated is performed under suction, the permeate pipe 1 connected to the intake pipe 6 of the membrane set 1
A suction pump 13 is attached in the middle of 2, and the suction pump 1
3 may be used to perform suction processing of the liquid to be processed. That is, by depressurizing the inside of each membrane sheet 2 by the suction pump 13, the permeated liquid is transferred through the separation membrane 4 to the membrane sheet 2.
And the permeated liquid is taken out through the water pipe 6 and the permeated liquid pipe 12. In this case, the tank 11 may be left open. When performing membrane separation under pressure, the tank 11 is a closed tank, and a pressure pump (not shown) is attached to the stock solution supply pipe 14 for supplying the liquid to be treated to the tank 11. Tank 11 using the pressure pump
The treatment may be performed while pressurizing the inside. In addition, 15 is a concentrated liquid pipe for taking out the concentrated liquid.
The treatment is continued while taking out a more constant amount of the concentrated liquid continuously or intermittently.

<Problems to be Solved by the Invention> The above-described membrane separation device including a membrane set made of a bag-shaped membrane sheet and a tank (or container) for storing the membrane set is
Unlike the conventional membrane module, the structure is extremely simple, so that the membrane set can be easily attached to and detached from the tank. Therefore, when a suspended substance or the like in the liquid to be treated adheres to the membrane surface of the membrane sheet, it is relatively easy to take the membrane set out of the bath and wash the membrane sheets one by one.

However, when performing membrane separation of a liquid to be treated containing a relatively large amount of suspended matter, the treatment cannot be continued for a long time unless the membrane sheet is frequently washed. However, no matter how easy the attachment / detachment of the membrane set is, it is a troublesome work, and there is a problem that the treatment must be interrupted during this.

The present invention solves the above-mentioned problems of the membrane separation device using the bag-shaped membrane sheet, and can effectively clean the membrane surface without removing the membrane set consisting of the membrane sheet from the tank. It is an object of the present invention to provide a liquid membrane separation apparatus capable of performing membrane separation of a liquid to be treated while always performing washing.

<Means for Solving Problems> The present invention is intended to take out a permeated liquid collected inside a membrane sheet group in which a plurality of membrane sheets each having a separation membrane formed in a bag shape are laminated. Membrane set consisting of the intake pipe of
It is configured with a tank that stores the membrane set, and the liquid to be treated is allowed to flow into the tank to perform membrane separation, and the permeated liquid obtained inside the membrane sheet through the separation membrane is passed through the water intake pipe to the tank. In a membrane separation device that is taken out to the outside, two or more membrane sets are parallel to the membrane surface of the membrane sheet, and one membrane set and one membrane set are placed one by one. The combination is stored in the tank in a state where they are alternately superposed, and at least one of the superposed membrane sets is provided with a driving means capable of reciprocating the membrane set parallel to the membrane surface of the membrane sheet. Then, by reciprocating the membrane set, the membrane surfaces of the superposed membrane sheets can be rubbed against each other, which is a liquid membrane separation device.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an example of an embodiment of the present invention,
FIG. 2 is an explanatory diagram showing an example of a flow when performing membrane separation of the liquid to be treated using the membrane separation apparatus shown in FIG. In addition, in FIG. 2, the membrane separation device is shown in FIG.
It is shown in a form substantially corresponding to a partially omitted vertical sectional view taken along the line. The membrane separation device shown in the drawing has two membrane sets 1a and 1b each having a rectangular membrane sheet 2 and having a structure similar to that of the conventional membrane set described above. So that the membrane surface is substantially horizontal,
Moreover, they are stored parallel to each other on the film surface. Both membrane set 1
a and 1b are such that the water intake pipes 6a and 6b face each other in the longitudinal direction in the tank 11, and the membrane sheets 2a of the membrane set 1a and the membrane sheets 2b of the membrane set 1b are
As shown in FIG. 2, the sheets are combined and stored one by one in an alternating manner. The shaded portions in FIG. 1 indicate the overlapping portions of the membrane sheets 2a and 2b.

In addition, the intake pipes 6a and 6b of both membrane sets 1a and 1b are
Both the membrane sets 1a and 1b are parallel to the membrane surface of the membrane sheet 2 and are always moved in different directions, that is, in the directions in which the membrane surfaces of the superposed membrane sheet 2a and the membrane sheet 2b can be rubbed against each other. A driving means 16 capable of reciprocating is attached. As the driving means 16, a conventionally known one can be used, but as an example in FIG. 1, by combining a plurality of arms 17 and a rotary plate 18, both membrane sets 1a and 1b are The driving means has a structure capable of reciprocating in such a manner that both of them move in the horizontal direction indicated by the arrow in the drawing and always in the opposite directions. That is, the arm 1 is attached to the intake pipe 6a of the membrane set 1a.
One end of 7a is connected to the intake pipe 6b of the membrane set 1b by an arm 17
One end of b is rotatably attached and the other end of the arm 17a attached to the water intake pipe 6a is attached to the motor 1
9 is rotatably pinned to the peripheral edge of the rotary plate 18 connected to the armature 9, and another arm 17c is hung between the other end of the arm 17b and the middle of the arm 17a to rotatably pin both ends thereof. And stop the arm 17c
Is fixed to the tank 11 with a pin or the like so that it can rotate at its central portion with the location as the fulcrum 20.

The driving means 16 having such a structure rotates the rotary plate 18 to the left or right by, for example, a motor 19 so that the two membrane sets 1a and 1b are horizontally aligned and the membrane set 1a and the membrane set 1b are always in a relative position. It can be reciprocated in the direction of movement. Arrangement position of both membrane sets 1a, 1b,
Alternatively, the length of each arm 17, the diameter of the rotary plate 18, etc.
When the two film sets 1a and 1b are closest to each other, it is preferable to set the area of the overlapping portion of the film surfaces (the hatched portion in FIG. 1) as large as possible,
Moreover, it is important to set so that the overlapping portion of the film surfaces does not disappear even when the two film sets 1a and 1b are farthest apart from each other, that is, the overlapping state is not eliminated.

The membrane separation device having the above-described structure is used for suctioning the liquid to be treated, as in the conventional device shown in FIG. 6, and 13 in FIG. 2 shows a suction pump therefor. The suction pump 13 and the membrane set 1a,
The water intake pipes 6a and 6b of 1b are connected by a hose 21 as a permeate liquid pipe. In the present invention, the hose (permeate liquid pipe) 21 may be extendable and foldable so that it can follow the movement of the membrane sets 1a and 1b when they are reciprocated. It is important and what is called a flexible hose is optimal.
Further, in FIG. 2, reference numeral 14 denotes a stock solution supply pipe and 15 denotes a concentrated liquid pipe, respectively, which are the same as in the conventional case.

<Operation> When performing membrane separation of the liquid to be treated, particularly the liquid to be treated containing a large amount of suspended matter, using the membrane separation device as shown in FIG. 1 and FIG. The liquid to be treated is caused to flow into the tank 11 and the suction pump 13 is driven to perform the same suction treatment as in the case of the above-described conventional membrane separation device, and the permeated liquid is collected inside each membrane sheet 2 and the permeated liquid is collected. The liquid is taken out of the system via the hose 21 and the suction pump 13. Although the above operation is exactly the same as the conventional one, in the present invention, the driving means 16 is driven while performing such suction filtration, and the rotary plate 18 is rotated, for example, to the right in FIG. 2 to set the both membrane sets 1a and 1b. Always reciprocate in opposite directions. That is, when the motor 19 is driven and the rotary plate 18 is rotated to the right, the arms 17a and 17b reciprocate horizontally and always in opposite directions, and accordingly, the membrane set 1a and the membrane set 1b also horizontally, And it always reciprocates in opposite directions. By moving the two film sets 1a and 1b in the opposite directions, the film surfaces of the superposed film sheets 2a and 2b can be rubbed against each other. When the suspended substance inside adheres to the film surface, it can be quickly peeled off. Therefore, the driving means 16
By continuously or intermittently driving the aspirating process, it is possible to perform the membrane separation while always peeling the suspended substances adhering to the membrane surface, and thus to obtain a stable permeated liquid amount for a long period of time. You can

If a suitable lid is provided on the tank 11 so that the inside of the tank 11 can be kept airtight and the inside of the tank 11 can be pressurized, a pressure-type membrane separation device can be used.

In the above-mentioned embodiment, the both membrane sets 1a and 1b are configured to reciprocate in the horizontal direction, but in short, in the present invention, any direction may be adopted as long as the membrane sheets of the two membrane sets that are superposed one another rub against each other. . Further, for the same reason, the driving means may be attached to only one of the superposed membrane sets, and only the one membrane set may reciprocate while the other membrane set is fixed.

Further, the number of membrane sets to be combined in the present invention may be any number as long as it is two or more. As an example, FIG. 3 shows a plan view of an apparatus in the case of combining three membrane sets.
In this case, each of the membrane sheets 2a of the membrane set 1a and each of the membrane sheets 2b of the membrane set 1b are alternately superposed one by one so that approximately half of the membrane surface portions of the respective membrane sheets 2a and 2b overlap each other. Also, each membrane sheet 2b of the membrane set 1b
And the respective membrane sheets 2c of the membrane set 1c are superposed in exactly the same manner on the other half of the membrane surface of the membrane sheet 2b, and the three membrane sets 1a, 1b, 1c are combined in this manner. The membrane separation device shown in FIG. 3 is provided with a drive means 16 capable of reciprocating the respective membrane sets 1a, 1b, 1c in the horizontal direction similarly to the device shown in FIG.
The superposed membrane sets, that is, the membrane set 1a and the membrane set 1b, or the membrane set 1b and the membrane set 1c are reciprocated so as to move in opposite directions. Further, the membrane set 1a and the membrane set 1c having no overlapping portion are always reciprocated in the same direction. Note that, in FIG. 3, the other parts are almost the same as the device shown in FIG. 1, and the same parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

Further, in the present invention, the membrane set may be housed so that the membrane surface of the membrane set is vertical in the tank, and in that case, the intake pipe of the membrane set may be bent upward by 90 °.

The separation membrane that can be used in the present invention may be any membrane as long as it can filter or permeate a liquid, and examples thereof include microfiltration membranes, ultrafiltration membranes and reverse osmosis membranes. Although “filtration” and “permeation” are strictly different, the liquid that has passed through the separation membrane is expressed as “permeation liquid” for the sake of convenience in the above description without distinguishing between them.

<Effects> As described above, according to the device of the present invention, the membrane surfaces of the superposed membrane sheets can be rubbed against each other by reciprocating the membrane set, so that the membrane set remains stored in the tank. The suspended substance adhering to the membrane surface in this state can be effectively peeled off, and the membrane surface can be washed while the membrane of the liquid to be treated is separated. Therefore, even when a liquid to be treated containing a large amount of suspended substances is treated, a stable amount of permeate can be obtained for a long period of time.

In addition, since the liquid to be treated in the tank can be stirred by reciprocating the membrane set, suspended substances in the liquid to be treated are less likely to adhere to the membrane surface than in the past, and more effective membrane separation is achieved. It becomes possible to do.

[Brief description of drawings]

1 to 3 each show an example of an embodiment of the present invention. FIG. 1 is a plan view of the device of the present invention, and FIG. 2 is a film treatment of a liquid to be treated using the device of the present invention. FIG. 3 is an explanatory view of the flow in the case, and FIG. 3 is a plan view of another embodiment of the device of the present invention. Further, FIGS. 4 and 5 are a vertical sectional view and a plan view of the film set, respectively, and FIG. 6 is an explanatory view of a processing flow of the conventional apparatus. DESCRIPTION OF SYMBOLS 1 ... Membrane set, 2 ... Membrane sheet 3 ... Support, 4 ... Separation membrane 5 ... Hole, 6 ... Water intake pipe 7 ... Blind flange, 8 ... Permeate outlet 9 ... Packing, 10 ... Flange 11 ... Tank, 12 ... permeate tube 13 ... suction pump, 14 ... stock solution supply tube 15 ... concentrate tube, 16 ... driving means 17 ... arm, 18 ... rotating plate 19 ... motor, 20 ... fulcrum 21 ... hose (permeate tube)

 ─────────────────────────────────────────────────── ─── Continuation of the front page Examiner Yasuyuki Yamada (56) References JP-A-61-200808 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A membrane set comprising a membrane sheet group in which a plurality of membrane sheets each having a separation membrane formed in a bag shape are laminated, and an intake pipe for taking out permeated liquid collected in each membrane sheet. , A tank that stores the membrane set, performs a membrane separation by flowing the liquid to be treated into the tank, and the permeate obtained inside the membrane sheet through the separation membrane through the intake pipe. In the membrane separation device that was taken out of the tank,
Combine two or more membrane sets in parallel to the membrane surface of the membrane sheet, and alternately stack one membrane set and one membrane set in the tank. And at least one membrane set of the two membrane sets superposed on each other is provided with a driving means capable of reciprocating the membrane set parallel to the membrane surface of the membrane sheet,
A liquid membrane separation device, wherein the membrane surfaces of the superposed membrane sheets can be rubbed together by reciprocating the membrane set.