JPH04135607A - Filtering and concentrating plate and unit - Google Patents

Abstract

PURPOSE:To carry out concentration and filtration with one device by forming the filtering and concentrating plate with a concentration part for concentrating a raw liq. and a filtration part for filtering the raw liq. concentrated at the concentration part. CONSTITUTION:A filtering and concentrating plate is made movable between the front and rear stands, and a raw liq. concentrating part 61 having at least a raw liq. supply through-hole 8 and a raw liq. discharge through-hole 9 is provided in the concentration bed 3e at the recess for a concentration part and a raw liq. filtering part 60 having a concentrated raw liq. supply through- hole 9 in the filtration bed 3a at the recess for a filtration part. Consequently, concentration and filtration are carried out with one device, the installation place and power source are reduced, the device is made compact, and the economical efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a filtration and concentration plate which is separately provided with a concentration section for concentrating a stock solution to a predetermined concentration and a filtration section for filtering the stock solution concentrated in the concentration section; The present invention relates to a filtration and concentration unit in which filter cloths are arranged before and after the filtration and concentration plate.

BACKGROUND OF THE INVENTION Hitherto, various types of filtration and concentration devices have been known. For example, while passing through a channel, a portion of the stock solution is filtered by a filter material covering the channel, and the filtered filtrate is discharged through the filtrate outflow channel, while the stock solution passing through the channel is gradually concentrated. It is known that the concentrate is discharged from the end of the channel as a concentrated stock solution (Japanese Patent Publication No. 7433/1983).

The concentrated stock solution concentrated by the above-mentioned concentrator is further supplied to a filtration device such as a filter press provided separately from the above-mentioned concentrator, where it is dehydrated and separated into a solid content and a liquid content. If the initial concentration of solids in the stock solution is, for example, 1% or less, and it is not desirable for the efficiency of the filtration device to feed it as is, the stock solution with such a low concentration is once passed through a concentrator to an appropriate amount. After concentrating it to a certain concentration, it is supplied to the filtration device.

Problems to be Solved by the Invention However, in the structure described above, since the concentrating device and the filtration device are provided separately, separate installation locations are required, and the power source for the device is also separate, making it uneconomical. There was a problem.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to create a compact device that can serve both as a concentrating device and a filtration device, reducing the installation space and power source. The purpose of the present invention is to provide a filtration concentration plate and a filtration concentration unit that are excellent in economical efficiency.

Means for Solving the Problems In order to achieve the above object, a filtration concentration plate according to the present invention includes a concentration section for concentrating a stock solution and a filtration section for filtering the stock solution concentrated in the concentration section. It consists of more.

That is, a concentrate concentration section that is movably arranged between the front and rear stands and has at least a through-hole for supplying the concentrate and a through-hole for discharging the concentrate in the concentration bed of the recess for the concentration section, and a filtration bed of the recess for the filtration section. and a stock solution filtration section having a through hole for supplying a concentrated stock solution.

In the above configuration, the filtration section may be configured to include a frame and a filter bed that is removably disposed within the frame.

Further, in the above structure, the concentrating section may be formed in a hollow area surrounded by a frame.

Further, in the above configuration, the surfaces of the concentrating section and the filtration section are each covered with a squeezed membrane, and the squeezed membrane of the filtration section can be configured to be expandable during squeeze filtration. .

Further, in order to achieve the above object, the filtration concentration unit according to the present invention includes filter cloths arranged before and after the filtration concentration plate, and each filter cloth has a portion facing the concentration portion of the filtration concentration plate other than the filter cloth. The structure is such that the mesh is coarser than that of the .

Effect of the Invention In the above configuration, after the filtration concentration plate or the filtration concentration unit is fastened to one of the stands between the front and rear stands, the stock solution is supplied to the concentration section of each filtration concentration plate to carry out the concentration process. Thereafter, the concentrated stock solution is supplied to the filtration section of each filtration/concentration member to perform a filtration process. When the filtration process is finished,
The tightening of the filtration and concentration plates is released, and the space between each filtration and concentration plate is opened to discharge the cake and prepare for the next concentration and filtration process.

Effects of the Invention According to the above structure, even a stock solution with a low concentration of 1% or less, which is difficult to process with a conventional filtration device, can be concentrated to a desired solid content in the concentration section of the filtration and concentration plate. Since the concentrated stock solution can be filtered in the filtration section, the filtration process can be performed easily and efficiently. In addition, the concentrating section and the filtration section can be incorporated into one filtration/concentration device, and the concentrating device and filtration device can be combined in one device, reducing the installation space and power source, making it compact. This makes it highly economical.

EXAMPLES Below, examples according to the present invention will be described in detail based on FIGS. 1 to 12.

The filtration concentration device having the filtration concentration plate according to this example is as follows:
As shown in Figures 1 and 2, between the front and rear stands (not shown), filter plates 3 and compressed filter plates 4 are alternately placed between the fixing plate 1 on one stand side and the tightening plate 2 on the other stand side. The filter plate 3 and the compressed filter plate 4 are arranged movably and are adjacent to each other.
After placing a pair of filter cloths 24 and 24 between the filter plates 24 and 24, moving the tightening plate 2 and tightening the filter plate 3 and compressed filter plate 4 to the fixed plate side, The stock solution is supplied to the concentrating section 61 for concentration, and the concentrated stock solution is supplied to the filter section 60 of the filter plate 3 for filtration.After the filtration is completed, the tightening plate 2 is moved to The plate 3 and the pressing filter plate 4 are opened to discharge the cake held between the pair of filter cloths 24, 24.

The filter plate 3 is the filtration concentration plate, and as shown in FIG. 34, it is made of a rectangular plate-shaped member having a rectangular frame-shaped frame 3b around its periphery. Form 60.

The filtration part 60 is formed by penetrating through the center of the filtration bed 3a and the filtration bed 3a, which is recessed from the frame 3b and has ribs 3f, . and a concentrated stock solution supply port IO. Handles 3d, 3d are formed protruding from both sides of each filter plate 3, and a filtrate discharge through-hole 11 and a compressed fluid supply through-hole 13 are formed in the upper part of the handle 3d. An ear is formed that projects from the lower corner and has a through hole 12.14 for draining the filtrate. The filtrate discharge through hole 11 in the upper part of one handle 3d is connected to a communication path 19 formed in the handle 3d and the filter plate.
．． . . , 19 to form four small openings 18. in the filter bed 3a. . The compressed fluid supply through-hole 13 at the top of the other handle 3d is used as a passage for supplying compressed fluid to the compressed filter plate 4.

Further, one of the filtrate discharge through holes 12 below the filter plate is connected to a communication path 21 formed within the filter plate. . . , 21 form four small openings 20. of the filter bed 3a. . . , 20, respectively, and the filtrate from the filter bed 3a is passed through the opening 20 and the communication path 21.
The filtrate is collected through the filtrate discharge through hole 12. The other filtrate discharge through-hole 14 below the filter plate is connected to a small opening (
(not shown), and the filtrate is collected from the pressing membrane 26 into the filtrate discharge through-hole 14 via the opening and communication path.

A concentrating section 61 separated from the filtering section 60 by a frame 3C is arranged above the filter plate 3. The concentrating section 61 includes a concentrating bed 3e having ribs 3g, . A stock solution supply port 8 is formed penetratingly at one end, and a stock solution discharge port 9 is formed penetratingly at the other end. This concentrated bed 3e has four small openings 15. ..., 15 are formed,
There are also four small openings 17 in the filter bed 3a. ..., 17 are formed, and the respective openings 15 and 17 are communicated through communication passages 16, so that the filtrate accumulated in the concentrated bed 3e passes from the openings 15, through the communication passages 16, and enters the filtration bed 3a through the openings 17. ,
Openings 18 and 20 for filtrate discharge of the filter bed 3a, and communication passage 19
．． 21 into the filtrate discharge opening 11.12. In this embodiment, as described above, the filtrate discharge path of the concentration bed 3e is made to use the filtrate discharge path of the filtration bed 3a. A communication path may be used to form a discharge path dedicated to the concentration bed for discharging the filtrate.

Further, the compressed filter plate 4 has the same shape as the filter plate 3 of the channel, and without forming ribs in the filtration method portion, the compressed membrane 24 is covered on both front and rear surfaces and fixed with pins 27..., 27. It will be done. When the compressed fluid is supplied, the portion of the compressed membrane 26 facing the filtration part 60 expands, and the stock solution held between the pair of filter cloths 24, 24 between the compressed filter plate 4 and the filter plate 3 is expanded. I'm trying to get squeezed.

Each filter cloth 24 is arranged between adjacent filter plates 3 and compressed filter plates 4. This filter cloth 24 and the filter plate 3 constitute a filtration and concentration unit according to this embodiment. Depending on the properties of the stock solution, the mesh of the filter cloth may be made coarser in the portion facing the concentration section 61 than in the portion facing the filtration section 60, or may be made to have a roughness between the entire surface. . Each filter cloth 24 has a through hole 24 communicating with the concentrated stock solution supply port 10.28 of the filter plate 3 and compressed filter plate 4 in the portion facing the filter section 60.
, a are formed, and through-holes 24b and 24c are formed in the portion facing the concentration section to communicate with the stock solution supply port 8 and stock solution discharge port 9 of the filter plate 3 and compressed filter plate 4, respectively.

Through-hole 2 communicating with the stock solution supply port 8 and the stock solution discharge port 9
4b and 24c, as shown in FIG. 5.6, a back plate 25 is arranged on the side of the filter plate 3 or compressed filter plate 4, and a front plate is arranged so as to face the back plate 25 with the filter cloth 24 in between. Place 22,
Bolt 23. ..., 23, both plates 25.22 are fixed to the filter cloth 24, and both plates 22.25 constitute a lip member. The surface plate 22 is made of a square plate with one end curved, and has an opening 22a in the center communicating with the stock solution supply port 8 or the stock solution discharge port 9, and a recess 22b on the opposite side to the curved side. The stock solution is supplied from the stock solution supply port 8 of the filter plate 3 or compressed filter plate 4 to the opening 22a of the surface plate 22 through the through hole 24b of the filter cloth 24 through the recess 22b to the concentration bed 3e. supply The concentrated stock solution is transferred to the surface plate 2 placed on the other stock solution outlet side.
The undiluted solution is discharged from the opening 22a through the recess 22b of No. 2 to the through hole 24c of the filter cloth 24 to the stock solution outlet 9. A recess 3m is formed in the concentration bed 3e of the filter plate 3 and the back plate 25 of the compression filter plate 4, so that when the filter plate 3 and the compression filter plate 4 are tightened by the tightening plate 2. , a back plate 25 attached to the filter cloth 24 is fitted into the recess 3m.

Next, the pump and line for supplying the stock solution and concentrated stock solution to the filter plate 3 will be explained.

In FIG. 1.2, the fixed plate 1 includes a stock solution supply pipe 5 that communicates with the stock solution supply port 8 of the concentrating section 61 of each filter plate 3 and the stock solution supply port 8 of each compressed filter plate 4, and A stock solution discharge pipe 6 that communicates with the stock solution discharge port 9 of the concentrating section 61 of the plate 3 and the stock solution discharge port 9 of the compressed filter plate 4, and the concentrated stock solution supply port 10 of each filter plate 3 and the concentrated stock solution of each compressed filter plate 4. A concentrated stock solution tube 7 communicating with the supply port 28 is arranged.

The stock solution supply pipe 5 includes a stock solution supply pump PI and a control valve V1.
and the stock solution tank T1 via the stock solution supply line Ll.
is connected to. An air supply line L6 is provided between the control valve Vl of the stock solution supply line L1 and the stock solution supply pipe 5 via a control valve v6, and air is supplied to the stock solution supply pipe 5 to the stock solution supply port 8, etc. The accumulated stock solution may be blown away.

The stock solution discharge pipe 6 is connected to the stock solution recovery tank T2 by a stock solution recovery line L2 via a turbidity meter and a control valve (2). A repeating line L3 is provided between the turbidity meter of the stock solution supply line L2 and the control valve (2) to return the concentrated stock solution to the stock solution tank T1 via the control valve (3). It is supplied again to the concentration section 61 for further concentration. The turbidity meter has flow path control units C1 and 02 connected to the control valves V3 and V2, respectively, and the turbidity meter determines whether the stock solution has been concentrated to a desired concentration. . Therefore, when the stock solution is lower than the desired value, the flow rate controllers C1 and 02 close the control valve (2) and open the control valve (3) to control the repetition line L3.
Accordingly, the stock solution that has once passed through the concentration section 61 is returned to the stock solution tank TI and is again supplied to the concentration section 61 of the filter plate 3 through the stock solution supply pipe 5 for concentration. On the other hand, if the concentrated stock solution is at or above the desired value, the flow rate controllers CI and 02 open the control valve v2 and close the control valve V3 to transfer the concentrated stock solution to the stock solution recovery tank T2. Collect within. Note that it is desirable that the control valves v2 and v3 can be manually switched. The stock solution recovery tank T2 is connected to the concentrated stock solution supply pipe 7 by a concentrated stock solution supply line L4 via a concentrated stock solution supply pump P2 and a control valve v4.

On the other hand, the filtrate discharge through holes 11, 12.14 of each filter plate 3 and each compressed filter plate 4 are connected to a filtrate tank T3 via a control valve V5 by a filtrate discharge line L5.

In addition, each compressed fluid supply port 1 of each filter plate 3 and each compressed filter plate 4
3 is a compressed fluid supply and discharge line L7 having a connection valve ■7
is connected.

According to the above configuration, the filtration and concentration apparatus according to this embodiment operates as follows. Examples of the stock solution include flow water, industrial gray water, domestic gray water, or liquid components from the chemical recovery process at a chemical factory.

First, from the stock solution tank T1 through the stock solution supply pump P], the stock solution supply line L1 and the control valve v1 are passed from the stock solution supply pipe 5 to each compression filter plate 4 and each stock solution supply port 8 of each filter plate 3 to the concentrating section of each filter plate 3. Supply the stock solution to 61. In the concentrating section 6I of each filter plate 3, a concentrating section 61 is provided in a concentrating chamber surrounded by a pair of filter cloths 24, 24 between the filter plate 3 and the compressed filter plate 4 facing the concentrating section 61. The stock solution is supplied from the stock solution supply port 8 on one end side, and the filtrate is discharged from between the filter cloth 24 and the filter plate 3 or the compressed filter plate 4, and the stock solution is supplied to the filter cloths 24, 2.
4 to the other end of the concentration chamber and concentrated, and this concentrated stock solution is discharged from the stock solution outlet 9 at the other end to the outside of the concentration section. The concentrated stock solution discharged from the concentration section 61 passes through the stock solution recovery line L2, the turbidity meter, and the control valve V2, and is collected into the stock solution recovery tank T2. Further, the filtrate filtered through the concentration bed 3e is transferred to a filtrate discharge opening 15 in the concentration bed 3e.
. . , a communication path 16 that opens from 15 to the filter bed 3a of the filter section 60. . . , 16 and onto the filter bed 3a, and the filtrate discharge openings 18. ..., 18/20. ..., 20 to communication path 19°, 19.21. ..., 21, are collected at the filtrate discharge through hole 11.12, and are collected in the filtrate tank T3 through the filtrate discharge line L5. Further, the concentrated stock solution is transferred to the concentrate collection line L at the point where the stock solution discharge pipe 6 exits.
While passing through the turbidity meter located on the turbidity meter 2, it is determined whether or not it has been concentrated to the desired concentration.

If the concentration of the concentrated stock solution is still lower than the desired value,
By closing the control valve V2 and opening the control valve v3, the concentrated stock solution is guided through the repetition line L3 to the original stock solution tank TI, and is again supplied to the concentration section 6I for concentration. Further, when the concentration of the concentrated stock solution has been increased to a desired value, the control valve 2 is opened,
By closing the control valve v3, the undiluted solution does not pass through the repetition line L3 and is collected into the undiluted solution recovery tank T2 via the undiluted solution recovery line L2.

The concentrated stock solution of a desired concentration collected in the stock solution recovery tank T2 is supplied to the filtration section 60 of each filter plate 3 from the concentrated stock solution supply pipe 7 through the concentrated stock solution supply line L4 and the control valve 4 by the concentrated stock solution supply pump P2. Ru.

In the filtration section 60, the concentrated stock solution is supplied from the concentrated stock solution supply port IO into the filter chamber formed between the pair of filter cloths 24, 24 between the filter plate 3 and the compressed filter plate 4, and the concentrated stock solution is supplied from the concentrated stock solution supply port IO. Or press filtration is performed.

The filtrate portion is collected from the filtrate discharge line L5 to the filtrate tank T3. This filtrate tank T3 is also used as a tank for storing the filtrate collected from the concentration section 61,
However, the present invention is not limited to this, and a separate filtrate tank for the concentration section may be provided. The cake generated between the filter cloths 24° and 24 between the filter bed 3a of the filter plate 3 and the pressing filter plate 4 facing the filter plate 3 is removed by the tightening plate 2.
After releasing the tightening, the filter plate 3 and compressed filter plate 4 are opened and discharged. Furthermore, when the plates are opened to release the filter cloths 24, 24, the filter cloth 24 that covers the concentration section 61 of the filter plate 3 and the filter cloth 24 that covers the filtration section 60 are one piece. 61 and the filtration section 60 can be washed at the same time, and both can be washed in one process.

According to the above-mentioned embodiment, even a low-concentration stock solution, for example, 1% or less, which is difficult to process with a conventional filtration device, can be reduced to a desired solid content in the concentration section 61 of the filter plate 3 as a filtration and concentration member. After concentration, the concentrated stock solution is passed through the filtration section 60.
Since the filtration process can be carried out easily and efficiently, the filtration process can be carried out easily and efficiently. In addition, the concentration section 61 and the filtration section 6
0 can be incorporated into one filtration concentration plate 3 or filtration concentration unit, the concentration device and the filtration device can be combined in one device, and the installation space, power source and control unit can be reduced. It is compact and has excellent economic efficiency.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways. For example, as shown in FIG.
However, as shown in FIG. 7.8, the second filter plate 31 having the concentrating part 61 can be attached and detached using bolts 30, . . . You can also combine them into a formula. In this case, the compressed filter plate 4 is similarly divided into a first filter plate main body 4a facing the filtration part 60 and a second filter plate main body 4b facing the concentrating part 61.
4b are preferably detachably connected with bolts or the like. Therefore, in this example, if the concentrating section 61 is not required, the second filter plate 31 and the second filter plate main body 4b can be removed and used as a normal filtration device.

Further, the concentrating section 6I is not limited to being disposed above the filtration section 60, but the concentrating section 61 can be disposed below the filtration section 60, as shown in FIG. 9.10. At this time, the surface plate of the mouth edge member is an annular plate 52, and the annular plate 52 and an annular back plate (not shown) are connected to bolts 53. ..., 53, are fixed to the filter cloth 24. In this example, the concentration section 6
1 concentration bed 3e has four small filtrate discharge openings 54.・
. . , 54 are formed, and the opening 54 communicates with the filtrate discharge through-hole 14 via a communication path 55.

Further, the concentration section 61 may be located on the side of the filtration section 60. The shape of the filter plate 3, the concentration section 61, and the filtration section 60 may be any shape such as a square shape or a round shape.

Furthermore, the present invention is not limited to the arrangement in which the filter plates 3 and compressed filter plates 4 are arranged alternately, and may be configured as a non-squeezable type filtration/concentration device consisting only of the filter plates 3.

Furthermore, as shown in FIGS. 11 and 12, the filter section 60 of the filter plate 33 can be constructed from a frame member 34 and a filter bed member 35 that is engaged within the frame member 34. In this case, mounting pieces 35b protrude alternately in the front and rear around the square plate-shaped filter bed member 35.

..., 35b are formed, and the mounting pieces 35b, ..., 3 are formed.
5b is removably attached to the edge of the rectangular opening 36 in the picture frame 31 of the frame member 34. The filter bed member 35
The material is not limited to a flat, perforated, or uneven plate made of polypropylene, vinyl chloride, wood, or metal, but may also be a net-like material. Further, a large number of protrusions 35a or a large number of through holes are formed on the surface of the filter bed member 35,
Allow the filtrate to drain smoothly. Furthermore, the concentration section 61 of the filter plate 33 may be formed in a hollow area surrounded by the frame 3j.

Further, if the pressure of the concentrated stock solution discharged from the stock solution discharge pipe 6 is sufficiently high, the concentrated stock solution supply pump P2 can be omitted.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing a filtration concentration device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the relationship between the filter plate of the device and the filtrate discharge line, and FIG. 4 is a sectional view taken along line A-A in FIG. 3, FIG. 5 is a vertical sectional view of the filter plate in FIG. 3, FIG. 6 is a sectional view taken along line BB in FIG. 3, and FIG. ．．
8 is a front view and a vertical cross-sectional view of a filter plate of a filtration and concentration device according to another embodiment, respectively, and FIGS. 9 and 10 are a front view and a longitudinal sectional view of a lower part of a filter plate of a filtration and concentration device according to another embodiment, respectively. The cross-sectional view and FIGS. 11 and 12 are a front view and a cross-sectional side view, respectively, of a filtration and concentration member according to still another embodiment. 1... Fixed plate, 2... Tightening plate, 3... Filter plate,
3a...filter bed, 3b, 3c...picture frame, 3d...
...Handle, 3e... Concentrated bed, 3f, 3g... Rib,
4... Pressing filter plate, 4a... First filter plate main body, 4b...
-Second filter plate main body, 5 - stock solution supply pipe, 6 - stock solution discharge pipe, 7 - concentrated stock solution supply pipe, end - stock solution supply port, 9...
・Stock solution outlet, lO...concentrated stock solution supply port, 11 12
．． 14... Penetration port for filtrate discharge, 13... Penetration port for compressed fluid supply, +5.17.1B, 20.54... Opening,
+ 6.19, 21.55...Communication path, 22.53.
・Surface plate, 23.53... Bolt, 24... Filter cloth,
25... Back plate, 26... Pressed membrane, 27... Pin, 3
0... Bolt, 31... Second filter plate, 32... First filter plate, 33... Filtration concentration member, 34... Frame member, 35...
...filter bed member, 60...filtration section, 61...concentration section. Patent applicant: Kurita Kikai Seisakusho Co., Ltd. Agent: Patent attorney Maeda Ao et al. Figure 3 Figure 5 Figure 6

Claims (5)

[Claims] (1) A stock solution concentration section that is movably arranged between the front and rear stands and has at least a stock solution supply through-hole (8) and a stock solution discharge through-hole (9) in the concentration bed (3e) of the concentration section recess. (61) and the filter bed (3a, 35) of the recess for the filter section
A stock solution filtration section (
60) A filtration concentration plate characterized by comprising: (2) The filtering section (60) has a frame section (34) and a frame section (
3. A filtration concentrator plate according to claim 1 or 2, comprising a filtration bed (35) removably arranged within the filtration plate (34). (3) The filtration and concentration plate according to any one of claims 1 to 3, wherein the concentration section (61) is formed hollow surrounded by a frame (3j). (4) The filtration and concentration plate according to claim 1, wherein the surfaces of the concentration section and the filtration section are each covered with a squeezed membrane, and the squeezed membrane of the filtration section is expandable during squeeze filtration. (5) Filter cloths (24) are arranged before and after the filtration concentration plate according to any one of claims 1 to 4, and each filter cloth (24)
The filtration and concentration unit according to any one of claims 1 to 4, wherein a portion of the filtration and concentration plate (3) facing the concentration section (61) is formed with a rougher mesh than other portions.