JPH067788Y2 - Membrane separation device - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention has a cleaning mechanism for removing deposits such as turbidity adhering to the film surface of a disk film due to liquid film separation. The present invention relates to improvement of a membrane separation device.

<Prior art> As a membrane separation device using a membrane such as a microfiltration membrane, an ultrafiltration membrane, or a reverse osmosis membrane, conventionally, a hollow fiber-shaped, tubular membrane-shaped, spiral-shaped, or flat-shaped membrane separation means has been used. However, in recent years, a membrane separation device using a rotating disc membrane has been proposed as a device particularly suitable for membrane separation of a liquid having a high turbidity concentration.

The membrane separation device is an open or closed container having a membrane separation means in which a plurality of disc membranes that rotate integrally with the rotary shaft are arranged in parallel in the axial direction of the hollow rotary shaft at predetermined intervals. When used, the liquid to be treated is made to flow into the container and the membrane separation means is immersed in the liquid to be treated to perform membrane separation of the liquid to be treated. The membrane-permeated liquid obtained in (1) is collected in the hollow part of the rotating shaft and allowed to flow out of the container. When the membrane separation means is used by being housed in an open container, the hydrostatic pressure of the liquid to be treated is used, or the membrane permeate side, that is, the pressure inside the disc membrane is reduced. Membrane separation is performed, and when the membrane is housed in a closed container for use, the liquid to be treated is mainly pressurized to perform membrane separation. Such a membrane separator can suppress concentration polarization on the membrane surface by rotating the disc membrane itself,
There is no need to stir or flow the liquid to be treated in the container by other means, and the liquid can be separated with low energy.

However, when the membrane separation of the liquid is continuously performed with the above-mentioned membrane separation device, suspended matter contained in the liquid to be treated is deposited on the membrane surface of the disc membrane, or a gel layer is deposited. The membrane permeation flow rate is significantly reduced.

Conventionally, it has been said that it is good to intermittently rotate the disc membrane at a high speed in order to remove such deposits from the membrane surface and recover the membrane permeation flow velocity, but this method is actually not very effective. Absent.

Therefore, in order to solve this problem, a cleaning member made of a soft material such as a sponge is brought into contact with the film surface of the disc film, and the deposit adhered to the film surface is scraped off by the cleaning member. A device has been proposed.

A conventional membrane separation device will be described with reference to FIG. 5. A hollow rotating shaft 52 is inserted into a side wall of the container 51 with a hollow rotating shaft 52 extending through a center axis of a horizontally closed cylindrical container 51 having a closed structure. In this state, a plurality of disc films 53 are arranged side by side at a predetermined interval in the axial direction of the rotating shaft 52 and the film surfaces are perpendicular to the rotating shaft direction 52. Disk membrane 5
3 has, for example, a structure in which the above-mentioned separation membrane is stretched on both sides of a disk-shaped support frame, and is attached so as to rotate integrally with the rotary shaft 52. It is driven and rotated by a motor 55 attached to one end thereof. In addition, reference numeral 54 represents the rotating shaft 52 and the disc film 53.
The membrane separation means composed of and is shown.

A cleaning member 56 made of a soft material such as sponge is in contact with the film surface of each disk film 53. The cleaning member 56 is adhered and fixed to a rod-shaped holder 57 with, for example, an adhesive agent, and the holder 57 has one end portion thereof attached to the container 51.
It is fixed to a fixed rod 58 provided inside.

Further, in FIG. 5, reference numeral 59 is an inlet for the liquid to be treated, 6
0 indicates the outlet of the concentrated liquid.

When the liquid is processed using the above-described membrane separation device, the liquid to be treated is supplied from the inlet 59 into the container 51 under pressure, and the motor 55 is driven to rotate the disc membrane 53. While performing the membrane separation, the liquid to be treated supplied into the container 51 comes into contact with the disc membrane 53 to be separated into a membrane permeate liquid and a non-permeate liquid, and permeates the disc membrane 53 to form the disc membrane 53. The membrane permeated liquid collected inside is discharged to the outside of the container 51 through the opening 61 at one end of the rotary shaft 52 while the non-permeated liquid is collected from the outlet port 60 through the container 51. It is discharged to the outside.

In the membrane separation device having the above-described configuration, the cleaning member 56 that is in contact with the membrane surface of the disc membrane 53 constantly scrapes off the deposits that adhere to the membrane surface due to the membrane separation of the liquid to be treated. Therefore, it is possible to prevent the permeation velocity from decreasing due to the film surface deposit.

<Problems to be Solved by the Invention> In the conventional apparatus, the cleaning member is always in contact with the disk membrane, and therefore the holder supporting and fixing the cleaning member is accompanied by the rotation of the disk film. A considerable amount of stress is applied due to the friction between the disc film and the cleaning member.

However, conventionally, since the structure in which the holder is fixed to the fixed rod only at one end thereof is adopted, the above-mentioned stress concentrates at one point of the joint between the holder and the fixed rod, so that the joint between the holder and the fixed rod is made. If the strength of the part is not made sufficiently strong, the above-mentioned stress causes the holder to fall off or tilt, while in the case of a support structure that can withstand the above-mentioned stress, the material used is also stainless steel, for example. There is a problem in that it is limited to metal such as steel that can have a support structure excellent in strength, and that it costs a lot.

<Means for Solving the Problem> The present invention is intended to solve the above-mentioned problems in the conventional apparatus, and a plurality of disc membranes are attached to a hollow fixed shaft mounted in a container. A membrane separating means is formed by inserting at intervals, and a cleaning member is provided in contact with the membrane surface of each disc membrane to form a cleaning mechanism, and the membrane permeate of the disc membrane is hollow on the fixed shaft. It is a membrane separation device that collects liquid in a part of the disk and flows it out of the container, and scrapes off the deposit adhered on the film surface of the disk film by a cleaning member. The support frame is rotatably mounted, the drive member is hung between the support frames, and the mounting port provided at one end of the holder of the cleaning member is rotatably attached to the fixed shaft, and the other end of the holder is attached. The cleaning member is engaged by the drive member and the support frame is rotated so that the cleaning member is rotated by the drive member. It is characterized by rotating the ruda.

<Operation> As described above, the present invention rotates the cleaning member by rotating the holder of the cleaning member with the support frame and the driving member to scrape off the deposits adhering to the film surface of the disc film. Along with this, the stress applied by friction with the disc film and the stress applied when scraping off the deposit are dispersed and received by both the holder mounting port and the engaging part of the drive member, and the holder is firmly supported. Is.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an explanatory view of a membrane separation device showing an embodiment of the present invention,
2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged perspective view of a cleaning member portion of the apparatus shown in FIG.

In the drawings, 1 is a horizontal cylindrical container having a closed structure, 2 is a hollow fixed shaft installed at the center axis of the container 1, 3 is a fixed space in the axial direction of the fixed shaft 2, and a membrane. A plurality of (three in the figure) disc membranes are inserted and attached so that their surfaces are perpendicular to the fixed shaft 2, and 4 is a membrane separation means composed of the fixed shaft 2 and the disc membrane 3. Shows.

Further, a holder 7 having a cleaning member 6 attached thereto is rotatably provided on the fixed shaft 2 via a space ring 5. As shown in FIG. 3, the holder 7 is made of, for example, polyurethane foam sponge or rubber. A cleaning member 6 such as a soft material or an elastic material is attached by means such as adhesion, and a mounting port 8 is provided at one end thereof. The groove of the space ring 5 in which the mounting port 8 is inserted into the fixed shaft 2 is attached. Any means may be used as long as the holder 7 is rotatably attached to the fixed shaft 2 without being limited thereto.

The cleaning member 6 of the holder 7 needs to contact the film surface of each disk film 3, that is, both surfaces of the disk film 3.

Further, the holder 7 does not have the mounting opening 8 at one end thereof,
As shown in FIG. 4, one end of the holder 7 has a mounting opening 8
The annular end member 9 may be provided so as to project.

The holder 7 of the cleaning member 6 may have a flat plate shape, a rod shape, or the like, and may have a structure in which the cleaning member 6 is wound around the holder 7.

Further, the space ring 5 inserted into the fixed shaft 2 serves to hold the plurality of disc membranes 3 at a predetermined interval by interposing them between the disc membranes 3 so that the membrane separating means can effectively function. I also have

Further, the support frames 10 are provided on the fixed shafts 2 at both ends of the disk membrane group 3.
Is rotatably mounted. As a mounting method, the insertion hole 11 provided in the central portion of the support frame 10 may be inserted into the fixed shaft 2 with play.

The drive member 12 of the cleaning member 6 is spanned between the support frames 10, and the support frame 10 is rotated to rotate the holder 7 of the cleaning member 6 by the drive member 12. 12 is engaged.

The driving member 12 may have a rod shape, a long flat plate shape, or the like, but a gutter-shaped member may be used for weight reduction and strength.

In addition, as one of means for rotating the support frame 10,
As shown in FIG. 1, a rotary shaft 13 may be provided on the outer periphery of one end of the fixed shaft 2, and a connecting rod 15 of a rotary substrate 14 attached to the rotary shaft 13 may be fitted into an insertion hole 16 of the support frame 10. Other than this, any means may be used as long as it rotates the support frame 10 by the rotating shaft 13, such as fixing the rotary substrate 14 and the support frame 10 with bolts (not shown).

The rotating shaft 13 is connected to rotating means such as the motor 20,
In some cases, the driving force of the motor 20 may be transmitted to the rotary shaft 13 via a pulley, a belt or the like. It should be noted that one end of the fixed shaft 2 connected to the rotary substrate 14 is closed, and the other end is opened to serve as a permeate outlet 17.

Also, the other end of the holder 7 and the engaging portion of the driving member 12 have a structure in which the other end of the holder 7 is hung on the driving member 12, but the structure is not limited to this structure, and the other end of the holder 7 is If the structure is such that the drive member 12 is inserted into the provided insertion hole (not shown) with play, and the drive member 12 is driven to rotate the holder 7 around the mounting port 8 of the holder 7, It can be anything.

The container 1 has an inflow pipe 18 for the liquid to be treated and an outflow pipe 19 for the concentrated liquid.
Connect.

When performing the membrane separation of the liquid using the device of the present invention having the above-mentioned configuration, the liquid to be treated is introduced into the inlet 18 as in the case of the conventional device.
Is supplied to the container 1 under pressure from the motor 20
Is driven to rotate the rotary shaft 13, the rotary substrate 14, and the support frame 10, and the drive member 12 rotates the holder 7 of the cleaning member 6 to perform the liquid membrane separation process.
The membrane permeated liquid of (3) is collected in the hollow portion of the fixed shaft 2 and flows out of the container 1, and the non-permeated liquid that has not permeated the disc membrane 3 flows out of the container 1 through the outflow pipe 19. However, the membrane separation process is continued while scraping off the deposit adhered on the film surface of the disc membrane 3 by the cleaning member 6 with the membrane separation process.

While such a membrane separation process is being performed, the membrane surface of the disc membrane 3 is always cleaned by the cleaning member 6 in contact with the membrane surface. By rotating with 10 and the drive member 12,
The stress applied to the holder 7 due to the friction applied at the time of scraping off the deposits is dispersedly received by both the mounting port 8 of the holder 7 and the engaging portion of the driving member 12, and the holder 7 having the cleaning member attached thereto as in the conventional device is received. It is possible to more firmly support the holder 7 as compared with the case where the holder 7 is supported only at one end.

In the above-described embodiment, the membrane separation means is housed in a container having a closed structure, and the example of the apparatus for membrane separation of the liquid to be treated under pressure has been described, but the device of the present invention is not limited to this, and the membrane separation means is not limited to this. The membrane may be housed in an open container, and the membrane may be separated by utilizing the hydrostatic pressure of the liquid to be treated or by reducing the pressure on the membrane permeate side.

Further, in the above-mentioned embodiment, the membrane separating means is provided horizontally in the container so that its fixed axis is horizontal, but the membrane separating means may be provided vertically so that its fixed axis is vertical. Good.

<Effect> According to the present invention, since the holder to which the cleaning member is attached is rotated by the support frame and the driving member, the stress applied by the friction between the cleaning member and the disc film and the stress applied when scraping the deposit are The holder is more firmly supported by being dispersed and received by both the mounting port of the holder and the engaging portion of the driving portion 12, and as a result, the holder does not drop out or be deformed, and only the one end is supported in the conventional device. I was able to solve the problem.

Further, there is also an advantage that the concentration polarization of the disk film surface can be reduced by the stirring effect of rotating the cleaning member.

Further, in the present invention, since the holder and the cleaning member, which are relatively light in weight, are rotated, the effect of reducing the rotating torque is also achieved as compared with the conventional device that rotates the disc membrane itself, which is much heavier than these. it can.

As for the material of the holder, it is not necessary to use a strong metal one as in the past, and it is possible to use a cheap one, for example, a plastic one such as hard vinyl chloride. The cost can be reduced.

[Brief description of drawings]

1 to 4 are drawings showing an embodiment of the present invention, FIG. 1 is an explanatory view of the device of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 4 is an enlarged perspective view of a cleaning member portion of the apparatus shown in FIG. 1, and FIG. 4 is an enlarged perspective view showing another embodiment of the cleaning member portion. FIG. 5 is a sectional view showing an example of a conventional device. 1 ... Container, 2 ... Fixed shaft 3 ... Disc membrane, 4 ... Membrane separating means 5 ... Space ring, 6 ... Cleaning member 7 ... Holder, 8 ... Mounting port 9 ... End member, 10 ... Support frame 11 ... Insertion hole, 12 ... Driving member 13 ... Rotating shaft

Claims (2)

[Scope of utility model registration request] 1. A membrane separating means is constructed by inserting a plurality of disc membranes at predetermined intervals on a hollow fixed shaft mounted in a container having a liquid inlet and a liquid outlet. , A cleaning member holder is provided so that the cleaning member comes into contact with the membrane surface of each disk membrane, and a cleaning mechanism is configured, and the membrane permeation liquid of the disk membrane is fixed by performing the membrane separation process of the liquid. A membrane separation device in which liquid is collected in the hollow portion and discharged to the outside of the container, and the deposit adhered to the membrane surface of the disc membrane due to the membrane separation treatment is scraped off by the cleaning member. A support frame is rotatably attached to the fixed shafts at both ends of the membrane group, a drive member is hung between the support frames, and a mounting port provided at one end of the cleaning member holder is rotatably attached to the fixed shaft. At the same time, engage the other end of the holder with the drive member to rotate the support frame. Membrane separation apparatus characterized by rotating the holder of the cleaning member by the drive member. 2. A plurality of disc membranes are inserted and attached at predetermined intervals via a space ring having a fixed shaft inserted therein, and a mounting port provided at one end of a holder of a cleaning member is rotated to the space ring. The membrane separation apparatus according to claim 1, which is mounted so as to be possible.