JPS63107708A - Flat membrane separator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention provides an i! ! A membrane is stretched to form a filter plate, and by flowing the stock solution through the liquid passage gap formed on the surface side of the filter membrane, the permeate (flux) that passes through the filter membrane and is obtained in the liquid collecting section. and a concentrated liquid (brine) that does not pass through a filter membrane.

(Prior art and its problems) Such a flat membrane separator was developed in Japanese Patent Publication No. 52-10113.
It is known from the publication No. As shown in Fig. 7.8, this conventional device consists of a single piece of horizontal support member 4 that is movable along a horizontal support member 4 that is interposed between a fixed end plate 2 and a fixed support column 3 that face each other in the front and back on a bed 1. While suspending the movable end plate 2a, the space between one or more (in this case three) partition plates 5a, 5a, 5b and the fixed end plate 2 and the partition plates, between the partition plates, and between the partition plates and the movable end. Between the plates 2a, a plurality of filter plates 6 are stacked with gaskets 6a interposed between them to form a plurality of laminates (hereinafter referred to as "blocks") I...IV, which are suspended, For example, by tightening bolts 7 and nuts 7a passed between the fixed end plate 2 and the movable end plate 2a, the block E...IV is compressed by both end plates.

Each filter plate 6 has a substrate 6b made of hard plastic with an uneven inner side around the periphery to form a liquid collection part 8, and
It is constructed by extending mll'J9 so as to cover the liquid collection section 8.

Further, the corrugated plate 6 has openings 10 and 11 at the upper and lower parts, and by stacking these filter plates, the openings 10 and 11 of each corrugated plate allow the upper liquid passage hole 10a and the lower liquid passage hole. A mouth 11a is formed. The upper liquid passage port 10a and the lower liquid passage port 11a are arranged in a liquid passage gap 9 formed between opposing filter plates.
Connect a in a series. Further, each filter plate 6 has a handling outlet 12 for handling the flux obtained in the liquid collection part 8 after passing through the filter membrane 9 from around the corrugated plate, and this is connected to a header pipe through a pipe 12a. I am contacting 12b.

Each partition plate between the first block (2) and the second block (2) and between the third block (2) and the fourth block IV uses a partition plate 5a having a lower relay port 11b communicating with the lower liquid passage port 11a of each block. , a partition plate 5b having an upper relay port 10b communicating with the upper liquid passage port 10a is used as the partition plate between the 210th block (■) and the third block (2), and the upper part of the fourth block IV is used as the movable end plate 2a. Liquid drain port 1 communicating with liquid passage port 10a
4 will be provided.

As a result, the stock solution supplied from the liquid passage port 13 of the fixed end plate 2 to the upper liquid passage port 10a of the first block I contacts the filter membrane through the liquid passage gaps 9a of all the filter plates of the first block I. At that time, the flux passed through the filter membrane and obtained in the liquid collection part 8 is passed through the pipe 12 from the handling outlet 12.
a and is collected in the header pipe 12b. On the other hand, the brine that has not passed through the filter membrane is transferred from the lower liquid passage port 11a of the first block I to the lower liquid passage port 11b of the partition plate 5a between the second block (2) and the lower liquid passage port of the second block (2). 11a, and the liquid passes through the gaps 9a of all the filter plates of the second block (2).
The flux comes into contact with the filter membrane and flows in an upward flow, and at this time, the flux that has passed through the filter membrane and is obtained in the liquid collecting section 8 is transferred to the waste outlet 12.
The brine that was discharged from the block (2) and did not permeate is transferred from the upper liquid passage port 10a of the second block (2) to the upper liquid passage port 10a of the third block (2) via the upper relay port 10b of the partition plate 5b between the third block (2). The liquid then flows downward through the liquid passage gaps 9a of all the corrugated plates of the third block (2).

In this way, as shown by the arrows in Figure 7, the liquid flows upward (or downward) through the liquid passage gap in the previous block by contacting the filter membrane, and then flows upward (or downward) to the next stage. The liquid flows through the passage gap of the blocks in the stage in a reverse downward flow (or upward flow) by contacting the filter membrane, and in this way, the flow repeats in a meandering manner in the vertical direction for each block, until the final stage (in this case The brine that does not pass through the filter membrane even though it flows through the liquid passage gap of the fourth block) in contact with the filter membrane is discharged from the drain port 14 of the movable end plate.

(Problems to be Solved by the Invention) However, such a flat membrane separator has a problem in that it cannot collect a large amount of flux. In order to investigate the cause of this problem, as shown in FIG. 9, the stock solution was passed through only one filter plate 6 on which an ultrafiltration membrane was stretched as a filtration membrane.
An experiment was conducted on the flux of the filter membrane 9.

In this experiment, human waste was treated with activated sludge using MLSS196.
00 (mu/l), CODM n 1210 (m
9/1) was used as a stock solution, and was supplied from the upper liquid passage port 10a at a supply pressure of 3 kg/cm2, passed through the liquid passage gap 9a in a downward flow, and discharged from the lower liquid passage port 11a. Ta. By the way, the average flow velocity U on the filter membrane surface is 1.91 m.
The stock solution was supplied at two speeds: /s and 1.63 m/s. In addition, the flux is applied to the upper liquid passage port 9a and the lower liquid passage port 118.
The space is divided into four sections, namely, the upper liquid passage port 10a side is the first division (1st>), the lower liquid passage port 11a side is the fourth division (4th
) and calculated the flux for each category.

The results of this experiment are shown in FIG.

In other words, the closer to the supply side (1st>) of the stock solution, the more flux there is, while on the discharge side (4th>) the flux is smaller.This tendency is the same even if the average flow velocity on the filter membrane surface is different. It is.

From the above experimental results, in the conventional flat membrane separator, the stock solution is supplied from one end of the filter plate, and the stock solution is supplied from the other end.

It became clear that the cause of the decrease in flux was that the brine was being discharged.

In addition, the pressure loss distribution of the partition plate gradually decreases from the relay port where the raw solution is supplied to the relay port where the brine is discharged, so the partition may be temporarily bent, especially at the two relay ports mentioned above. The longer the distance, the greater the deflection. Therefore, in order to suppress this deflection, there has been a problem in that the material of the partition plate must be made of a material with high rigidity, such as stainless steel, or the thickness must be increased.

In addition, when the flat membrane valve 11 device is applied for wastewater treatment, it is used once a week, or when it is applied for processes such as food manufacturing, it is used before and after the start of daily work. Afterwards, it is necessary to open the filter plate and clean it.
Prior to this frame opening, there was the trouble of having to remove the piping on the movable end plate side.

Roughly speaking, the flux is connected to the header pipe at the outlet of each filter plate with a long flexible pipe so that the above-mentioned frame opening work can be carried out sufficiently, but there are as many pipes as there are filter plates. As a result, the surroundings of the device become complicated, and each filter plate must be provided with a vibrator, which is an inconvenience.

(Means for solving the problem) Therefore, the present invention has been developed by laminating a plurality of filter plates in the front and rear direction □, which are formed by extending a filter membrane made of a semi-permeable membrane onto a substrate having a liquid collection part. constructing a body, interposing a partition plate between the fixed end plate and the movable end plate, and compressing the laminate in multiple stages in the front and back direction, and flowing the stock solution into the liquid passage gap on the filter membrane surface of each of the filter plates. In a flat membrane separator that separates a permeated liquid that has passed through a filter membrane and a concentrated liquid that has not passed through a filter membrane, openings are provided in the center and both ends of the filter plate to allow liquid to pass through the upper part of the laminate. A permeate opening is formed in the laminate by forming a permeate opening, a central liquid passage port, and a lower liquid passage port, and a permeate opening communicating with the liquid collecting portion of the filter plate, and a permeate liquid passage port is formed in the laminated body, and a permeate liquid passage port is formed in the laminated body, and a permeate liquid passage port is formed in the laminated body. A liquid opening is provided to form a concentrated liquid passage port in the stacked body, and the stock solution is supplied to the central liquid passage port of the preceding stacked body, and the concentrated liquid is discharged from the upper liquid passage port and the lower liquid passage port. Then, the concentrated liquid discharged from the upper liquid passage port and the lower liquid passage port of the previous stage is supplied as a stock solution to the upper liquid passage port and the lower liquid passage port of the laminated body of the latter stage, and the concentrated liquid is concentrated from the central liquid passage port. The concentrated liquid of the last stage stacked body is discharged to the concentrated liquid passage port, and the permeated liquid of the liquid collecting portion of each filter plate is discharged to the permeated liquid passage port. It is characterized by

(Function) Accordingly, in the present invention, when the stock solution from the central opening or the openings at both ends of the filter plate moves to the openings at both ends or the central opening, it passes through the filter membrane and the permeated liquid ( This flux is discharged from the permeate passage port, and the concentrated liquid (brine) at the last stage is discharged from the concentrate passage port.

(Description of Embodiment) FIGS. 1 to 6 show an embodiment of the present invention, and components having the same functions as those of the conventional example described above are given the same reference numerals.

FIG. 1 is a side view of the entire device, in which the overall liquid flow of the present invention is indicated by arrows. In order to obtain such a flow, a stock solution supply port 13 and a concentrated liquid drain port 14 are provided in the center of the fixed end plate 2, and a permeate drain port 12 is provided in the lower end. There is. The filter plate 6, which roughly constitutes each block, has a liquid collecting part 8 formed into an uneven shape on the inner side of the periphery of the substrate 6b, and this liquid collecting part has an upper liquid collecting part 8' and a lower liquid collecting part 8''. It consists of two upper and lower liquid collecting parts, and these two liquid passing parts are communicated by a passage 8'H.The uneven shape of the liquid collecting part 8 consists of a protruding strip 8a and a recessed part 8b, and all A groove 8C is provided so that the recess 8b communicates with the groove 8C.

A filter membrane 9 is stretched over the substrate 6b so as to cover the liquid collecting portion 8, and the peripheral edge of the filter membrane 9 is fixed to a groove provided in the peripheral edge of the substrate 6b with a membrane presser backing 9'. Furthermore, the board 6
A gasket support groove is provided at the periphery of b, in which a gasket 6a made of soft rubber or the like is placed.

The board 6b also has two central openings 15 and 15 in the center.
An upper opening 16.16 and a lower opening 17.17 are opened at both ends. Further, a concentrate opening 18 is opened at the middle of the central opening 1515, and a permeate opening 19 is opened at the middle of the lower opening 17.17. - is provided. In addition, the permeate opening 19 is connected to the lower liquid collecting section 8'' and the passage 2.
Connected by 0.

1st block quest, 2nd block ■ and 310th question ■
As shown in FIG. 5, the partition plate 5a that partitions the filter plate 6 and the fourth block IV is located at a position corresponding to an upper opening 16.16 and a lower opening 17.17, which are opened at both ends of the filter plate 6. , upper relay port 16a.

16a and the lower relay ports 17a, 17a, and the concentrate opening 18. A concentrated liquid relay hole 18a and a permeated liquid relay port 19a are opened at positions corresponding to the permeated liquid opening 19, respectively. Furthermore, as shown in FIG. 6, the partition plate 5b that partitions the second block (2) and the third block 1v has a central relay port 15a located at a position corresponding to the central opening 15.15 of the filter plate 6.
, 15a are also provided with a concentrated liquid relay hole 18a and a permeated liquid relay port 19a at positions corresponding to the concentrated liquid opening 18 and the permeated liquid opening 19, respectively.

The filter plate 6 and the partition plate 5a configured as described above.

5b between the fixed end plate 2 and the movable end plate 2a, the gasket 6a causes the filter plate 6 to close between the fixed end plate 2 and the filter plate 6.
A liquid passage gap 9a is formed between this filter plate and other filter plates 6 in front and behind, between the filter plate 6 and the partition plate 5a or 5b, and between the filter plate 6 and the movable end plate 2a.

On the other hand, due to the stacking of each filter plate 6, the central opening 15 of the filter plate 6 is
The collection of these forms the center liquid passage port 15b, and the collection of the upper opening 16 and the lower opening 17 of the filter plate 6 forms the upper liquid passage port 10a and the lower liquid passage port 11a, respectively, which are connected to the concentrated liquid opening 18 and permeate. Each set of liquid openings 19 forms a concentrated liquid passage port 18b and a permeated liquid passage port 19b.

Therefore, the stock solution supplied from the stock solution supply port 13 of the fixed end plate 2 enters the center liquid passage port 15b of the first block I, and is separated vertically through the liquid passage gap 9a... to the upper liquid passage port 10a.
and flows toward the lower liquid passage port 11a. During this liquid passage,
The flux that has passed through the filter membrane 9 is collected at the liquid collecting portion 8 of each filter plate 6.
The 7 luxes in the upper liquid collection section 8' merge with the 7 luxes in the lower liquid collection section 8'' through the passage 8', and the
The flux flows from the permeated liquid to the permeated liquid passage port 19b, and is discharged from the permeated liquid outlet 12 of the end plate 2 provided corresponding to the permeated liquid passage port 19b.

The brine in the upper and lower liquid passage ports 10a, 11a passes through the upper relay ports 16a, 16a and the lower relay ports 17a, 17a of the partition plate 5a, which are provided corresponding to the liquid passage ports 10a, 11a. Upper part of 2 block■ liquid passage 1
0a, is supplied to the lower liquid passage port 11a, and both these liquid passage ports 1
0a, Ila to the liquid passage gap 9a of this second block
It flows toward the center liquid passage port 15b. During this liquid passage, 7 lux is obtained in the liquid collection section 8, as in the first block above, and is discharged to the permeated liquid passage port 19b in the same manner as J. The supply of the stock solution for the next third block
The brine in the central liquid passage port 15b of the block (2) passes through the central liquid passage port 15a of the partition plate 5b between the second block (2) and the third block (2) to the central liquid passage port 1 of the third block (2).
5b.

In other words, the flow direction of the liquid provided in the present invention is such that adjacent odd-numbered blocks and even-numbered blocks flow in the same direction. The fourth block IV, which is the last stage, is the second
As in block ①, the brine flows to be collected in the central liquid passage port 15b, but in order to discharge it from there to the outside of the system, the filter plate 6 constituting these 10 blocks has a concentrated liquid opening 1.
8 without an O-ring 18', the brine reaches the concentrate opening 18. Therefore, the concentrate is discharged from the drain port 14 of the fixed end portion provided corresponding to the concentrated liquid passage port 18b of the other block.

In this way, in the present invention, in any block,
The distance of the stock solution flowing through the liquid passage gap is half the length of the filter plate, and all the liquid flows in and out through the fixed end plate 2.

In the above embodiment, two types of partition plates 5 are provided between each block.
Although the partition plates a and 5b are provided, it is possible to omit this partition plate. Between the front and rear blocks, the central opening 15 of the filter plate located at the end of the front stage block or the filter plate located at the beginning of the rear stage block is blinded to function as a partition plate 5a, and the upper and lower Opening 16.
17 is made blind so that it can function as a partition plate 5b.

This blind can be either the central opening 15 or the upper and lower openings 1
This can be easily done using a component such as a lid for 6.17, and in this case, it is convenient because there is no need to separately manufacture a partition plate. Therefore, when referring to the partition plate in the present invention, it must be understood that it also includes cases where the partition plate is also used as a filter plate.

In addition, in the above embodiment, the number of blocks is an even number, but an odd number may be used.The fixed end plate is arranged so that the stock solution is supplied to the first block 2 has two stock solution supply ports 13 corresponding to this [
You can also do this by

Furthermore, although the example in which the concentrate opening 18 is provided at the center of the filter plate 6 has been shown, it may be provided above and/or below the filter plate 6, for example, between the upper openings 16 and 16. It may also be provided below the permeate opening 19.

(Effects of the Invention) The present invention has openings in the center and both ends of the filter plate to allow the stock solution to flow from the center to both ends or from both ends to the center, thereby reducing the flow distance by half. It can be used as a flat membrane separator with a large amount of flux.

Furthermore, since the distance through which the stock solution flows through the partition plate is halved, the pressure difference between relay days is small. Therefore, the thickness of the partition plate can be made thinner, or it can be made of synthetic resin or the like.

In general, all liquid inflow and outflow is provided on the fixed end plate, so when repairing the filter plate or cleaning the filter plate, which is frequently done by opening the frame, it is necessary to connect the piping on the movable end plate each time. It is convenient because there is no need to remove it.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the flat membrane valve @ device of the present invention, with Figure 1 being a side view of the whole, Figure 2 being a side view of the
FIG. 3 is a front view of the filter plate, FIG. 4 is an enlarged cross-sectional view taken along line A-A in FIG. 3, and FIGS. 5 and 6 are front views of the partition plate. FIG. 7 is a side view of the entire conventional device, FIG. 8 is a cross-sectional view showing the separated state of FIG. 7, FIG. 9 is a cross-sectional view for testing the state of flux in the filter plate of the conventional device, and The figure is a graph showing the experimental results in FIG. 2...Fixed end plate 2a...Movable end plate 5a, 5b...Partition plate 6...Filter plate 6a...Gasket 6b...Substrate 8...Liquid collection part 9...Filter Membrane 9a...Liquid passage gap 10a...Top liquid passage port 11a...Lower liquid passage port 15b...Central liquid passage port 15...Central opening 16...Top opening 17... Lower opening 15a...Central relay port 16a...Upper relay port 17a...Upper relay port 18...Concentrate opening 18b...Concentrate liquid passage port 19...Permeated liquid opening 19b...・Permeated liquid flow port Fig. 8 Fig. 9 Fig. 10 Volatility

Claims (1)

[Claims] (1) Construct a laminate by stacking a plurality of filter plates in the front-rear direction, which are formed by stretching a semi-permeable membrane on a substrate having a liquid collection part, and combine the laminate with a fixed end plate and a movable end plate. By interposing a partition plate between the plates and applying pressure in multiple stages in the front and back direction, and by flowing the stock solution into the liquid passage gap on the filter membrane surface of each of the above-mentioned filter plates, the permeated liquid that has passed through the filter membrane and the permeated liquid that has passed through the filter membrane are separated. In a flat membrane separator that separates a concentrated liquid from a concentrated liquid, openings are provided in the center and both ends of the filter plate to form an upper liquid passage port, a central liquid passage port, and a lower liquid passage port in the laminated body. , providing a permeate opening communicating with the liquid collecting portion of the filter plate to form a permeate passage port in the layered body, and providing a concentrated liquid opening in the filter plate to form a concentrated liquid passage port in the layered body. supplying the stock solution to the central liquid passage port of the preceding layered body, discharging the concentrated liquid from the upper liquid passage port and the lower liquid passage port, and supplying the concentrated liquid to the upper liquid passage port and the lower liquid passage port of the latter layered body. The concentrated liquid discharged from the upper liquid passage port and the lower liquid passage port of the previous stage is supplied as a stock solution to the liquid port, and the concentrated liquid is discharged from the central liquid passage port as a concentrated liquid, and the concentrated liquid of the laminated body of the last stage is supplied. A flat membrane separator characterized in that: the concentrated liquid is discharged to the concentrated liquid passage port, and the permeated liquid from the liquid collection portion of each of the filter plates is discharged to the permeated liquid passage port.