JPH04114800A - Filtering and concentrating apparatus - Google Patents

Abstract

PURPOSE:To obtain a filtering and concentrating apparatus which can carry out filtration treatment easily and efficiently and is highly economical by assembling a concentrating part to concentrate a raw liquid and a filtering part to filter the concentrated raw liquid in one apparatus. CONSTITUTION:A filter plate 3 and a compressing filter plate 4 are reciprocally and movably put between a fixed board 1 in one stand side and a fastening board 2 in the other stand side. A pair of filtration cloths are put between the filter plate 3 and the compressing filter plate 4 and the filter plate 3 and the compressing filter plate 4 are fastened to the fixed board 1 by the fastening board 2. Then, a raw liquid is supplied to a concentrating part 61 of the filter plate 3 to be concentrated and the concentrated raw liquid is supplied to a filtering part 60 of the filter plate 3 to be filtered. After the completion of the filtration. the fastening board 2 is moved and the filter plate 3 and the compressing filter plate 4 are separated and a cake held between the pair of the filter cloths is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a filtration/concentration member 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 device having a filtration and concentration device.

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 solids concentration 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 concentration device and the filtration device are provided separately, separate installation locations are required, and separate piping is also required. Therefore, the power sources for the devices are separate, the operation and operation systems are separate, and the same stock solution is processed separately in two devices, which is uneconomical.

Therefore, an object of the present invention is to solve the above problems, and it is possible to use a single device as both a concentration device and a filtration device, thereby reducing the installation space, piping, and power source, making it compact. In addition to becoming a vehicle, the driving operation is also 1.
The object of the present invention is to provide a filtration and concentration device that can be integrated into one system and is highly economical.

Means for Solving the Problems In order to achieve the above object, the present invention is configured to have a filtration/concentration member having a concentration section for concentrating a stock solution and a filtration section for filtering the stock solution concentrated in the concentration section. do. 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. A plurality of filtration/concentration members each having a undiluted solution filtration section having a through-hole for supplying a concentrated undiluted solution; a tightening member for tightening the filtration/concentration member to one of the stands; and a tightening member disposed between adjacent filtration/concentration members; a pair of filter cloths having through holes that communicate with the through holes of each of the filtration and concentration members;
a stock solution supply pump that supplies the stock solution to the concentration section of each filtration and concentration member with the filtration and concentration member being tightened relative to one stand by the tightening member; and the pump and the concentration section of each of the filtration and concentration members. It is configured to include a connecting stock solution concentration line and a stock solution filtration line that supplies the stock solution concentrated in the concentration section of the filtration/concentration member to the filtration section of each filtration/concentration member.

In the above configuration, the undiluted solution filtration line may be configured to include a concentrated undiluted solution supply pump that supplies the concentrated undiluted solution to each filtration/concentration member.

In the above configuration, the filtration section of each of the filtration and concentration members is
It can also be configured to include a frame and a filter bed removably disposed within the frame.

In the above configuration, the concentration section of each of the above filtration concentration members is
It can also be configured to be formed in a hollow area surrounded by a frame.

In the above configuration, the filter cloth may be configured such that a portion of the filtration/concentration member facing the concentrating portion is formed with a coarser mesh than other portions.
It is also possible to arrange a compressed filter plate between adjacent filtration/concentration members, and to arrange the filter cloth between the compressed filter plate and the filtration/concentration member.

Effect of the Invention In the above configuration, after the filtration concentration member is tightened by the tightening member on one stand side between the two stands, the undiluted solution is supplied by the undiluted solution supply pump to the concentration section of each filtration and concentration member through the undiluted solution concentration line. Perform concentration treatment. Thereafter, the concentrated stock solution is supplied to the filtration section of each filtration/concentration member through the stock solution filtration line to perform a filtration process. When the filtration process is completed, the tightening by the tightening member is released, the space between each filtration and concentration member is opened, and the cake held between the pair of filter cloths is discharged, in preparation for the next concentration and filtration process.

Effects of the Invention According to the above configuration, even a raw 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 member. 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, allowing the concentrating device and the filtration device to be combined in one device, reducing the installation space, piping, and power source. The system is compact and can be operated in one system, making it highly economical.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12.

As shown in FIG. 1.2, the filtration and concentration device according to this embodiment has a filter plate between a fixing plate l on one stand side and a tightening plate 2 on the other stand side between the front and rear stands (not shown). 3 and compressed filter plates 4 are arranged so as to be movable alternately, a pair of filter cloths 24, 24 are arranged between adjacent filter plates 3 and compressed filter plates 4, and the tightening plate 2 is moved. After tightening the filter plate 3 and compressed filter plate 4 to the fixed plate side with the tightening plate 2, the stock solution is supplied to the concentration section 6I of the filter plate 3 to be concentrated, and the concentrated stock solution is filtered by the filter plate 3. At the same time, after the filtration is completed, the tightening plate 2 is moved to open the filter plate 3 and compressed filter plate 4, and the filter cloths 24 and 24 are The device is configured to discharge the retained cake.

As shown in FIGS. 3 and 4, the filter plate 3 is made of a rectangular plate-shaped member having a rectangular frame-shaped frame 3b around its periphery, and has a filtration part 60 formed on its front and rear surfaces from the center downward. 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 through hole for discharging filtrate is provided at the upper part of the handle 3d! A through-hole I3 for supplying compressed fluid is formed as shown in FIG. The filtrate discharge through-hole 11 in the upper part of one handle 3d is connected to a communication passage 19 formed in the handle 3d and the filter plate.
..., +9 causes four small openings 18. in the filter bed 3a. ..., 18 respectively, and the filtrate is discharged from the filtration bed 3a through the opening 18 and the communication path 19! Collect at 1. 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 I2 below the filter plate is connected to a communication path 21.・・・
, 21 to form four small openings 20 in the filter bed 3a.
．． , 20, respectively, and collects the filtrate from the filter bed 3a through the opening 20 and the communication path 21 to the filtrate discharge through-hole 12. The other filtrate discharge through-hole I4 below the filter plate communicates with small openings (not shown) of the squeezed membrane 26 through communication passages (not shown) formed in the squeezed filter plate, and the squeezed membrane 2
6, the filtrate is collected into the filtrate discharge through-hole 14 through 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 +5, -, I5, and the filter bed 3a also has four small openings D17. ..., 17
are formed, and the respective openings 15 and 17 are communicated with each other through communication passages ]6, so that the filtrate accumulated in the concentration bed 3e is transferred to the openings 15 and 17.
The liquid passes through the communication path 16 and enters the filter bed 3a through the opening 17, and is collected in the filter bed 3aO)'a liquid discharge openings 18, 20 and the communication path 19.21 into the filtrate discharge through-hole 11.12. Ru. In this embodiment, as described above, the filtrate discharge route of the concentrated bed 3e is made to use the filtrate discharge route of the filter bed 3a.
A discharge path dedicated to the concentration bed for discharging the filtrate may be formed in the liquid discharge through-hole 11 or the like through a communicating path.

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 sides of the rib and fixed with pins 27° and 27. It will be done. When the compressed fluid is supplied, the portion of the compressed membrane 26 facing the filtration 160 expands, causing the compressed filter plate 4 and the filter plate 3 to expand.
The stock solution held between the pair of filter cloths 24 and 24 is squeezed.

Each filter cloth 24 is arranged between adjacent filter plates 3 and compressed filter plates 4. 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 the mesh may be coarser across the entire surface of the filter cloth. . Each filter cloth 24 has a concentrated stock solution supply port 10 of the filter plate 3 and compressed filter plate 4 in a portion facing the filter section 60.
．． A through hole 24a communicating with 28 is formed, and
Through holes 24b, 24. which 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, in the portion facing the concentration section. c is formed.

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 connects both plates 25.22 to the filter cloth 2
4 and the drawing plates 22 and 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 22 disposed on the other stock solution outlet side.
The raw solution is discharged from the opening 22a through the recess 22b and through the through hole 24c of the filter cloth 24 to the stock solution outlet 9. Recesses 3m are formed in the portions of the filter plate 3 facing the concentration bed 3e and the back plate 25 of the compressed filter plate 4, so that when the filter plate 3 and the compressed 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 fixing plate l 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 pressing 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 lO 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 P1 and a control valve Vl.
and the stock solution tank TI via the stock solution supply line Lf.
is connected to. An air supply line L6 is provided between the control valve Vl of the stock solution supply line L+ 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 W6 is connected to the stock solution recovery link T2 by a stock solution recovery line L2 via a turbidity meter and a control valve V2. A repeating line L3 is provided between the turbidity meter of the stock solution supply line L2 and the control valve V2 to return the stock solution tank TI to the stock solution tank TI via the control valve V3, and the concentrated stock solution concentrated in the concentration section 61 is concentrated again. It is supplied to Section 6■ for further concentration. In the turbidity meter, flow path control units CI and 02 are connected to control valve v3 and control valve ■2, respectively, and the turbidity meter determines whether the stock solution has been concentrated to a desired concentration. do. Therefore, when the stock solution is lower than the desired value, the flow rate controllers CI and 02 close the control valve v2 and open the control valve v3, so that the repeat line L3 is closed.
Thus, the stock solution that has once passed through the concentration section 6I is returned to the stock solution tank T1, 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, when the concentrated stock solution is at or above the desired value, the flow rate controllers CI and C2 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 4.

On the other hand, each of the filtrate discharge through holes I+, 12.14 of each filter plate 3 and each compressed filter plate 4 is 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 v7
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, factory gray water, domestic gray water, and liquid components from a chemical recovery process in a chemical factory.

First, from the stock solution tank TI, the stock solution supply pump P1 passes the stock solution supply line Ll and the control valve V1, and from the stock solution supply pipe 5, each squeeze filter plate 4 and each stock solution supply port 8 of each filter plate 3 are passed through the concentration section 6I of each filter plate 3. Supply the stock solution to. In the concentrating section 61 of each filter plate 3, the concentrating section 61 is located 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 compressed filter plate 4, and the stock solution is supplied to the filter cloth 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 opening from 15 to the filter bed 3a of the filter section 60! 6. ..., passes through 16 and onto the filter bed 3a,
Additionally, filtrate discharge openings 18 at the top and bottom of the filter bed 3a. ..., 18.20. ..., communication path 1 from 20
9..., 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 T1, and is again supplied to the concentration section 61 for concentration. Further, when the concentration of the concentrated stock solution has been increased to a desired value, the control valve v2 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 having 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 V4 by the concentrated stock solution supply pump P2. .

In the filtration section 60, the concentrated stock solution is supplied from the concentrated stock solution supply port 10 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 10. 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 6■.
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 filter cloths 24 and 24 are opened, the filter cloth 24 that covers the concentrating section 61 of the filter plate 3 and the filter cloth 24 that covers the filter section 60 are in contact with each other. The section 61 and the filtration section 60 can be washed at the same time, and both can be washed in one step.

According to the above-mentioned embodiment, even a stock solution with a low concentration of 1% or less, which is difficult to process with a conventional ILT filtration device, can be processed to a desired solid content in the concentration section 61 of the filter plate 3 as a filtration and concentration member. After concentrating to 100%, the concentrated stock solution can be filtered in the filtration section 60, so that the filtration process can be performed easily and efficiently. In addition, the concentrating section 61 and the filtration section 60 can be incorporated into one filtration/concentration device, and the concentrating device and the filtration device can be combined in one device. It is possible to reduce the amount of noise, making it compact, and the driving operations can be integrated into one system, making it highly economical.

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 FIGS. 7 and 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 61 is not limited to being disposed above the filtration section 60, but can be disposed below the filtration section 60 as shown in FIGS. 9 and 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 1. 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 one in which the filter plates 3 and compressed filter plates 4 are arranged alternately, but can also be constructed 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, ..., 35 are formed.
b is removably attached to the edge of the rectangular opening 36 in the frame 31 of the frame member 34. The filter bed member 35 is not limited to a flat, perforated, or uneven plate made of polypropylene, vinyl chloride, wood, or metal, but may also be a net. 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 so that the filtrate can be smoothly discharged. Furthermore, the filter plate 3
3 may be formed in a hollow area surrounded by a 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 shows a! according to an embodiment of the present invention. A schematic explanatory diagram showing a superconcentration device, FIG. 2 is an explanatory diagram showing the relationship between the filter plate of the device and the filtrate discharge line, and FIG. 3 is a front view of the filter plate.
4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a longitudinal sectional view of the filter plate in FIG. 3, FIG. 6 is a sectional view taken along the line B-B in 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, 3
a...Filtering bed, 3b, 3c...Picture frame, 3d...Handle,
3e...concentration bed, 3f, 3g...rib, 4...press filter plate, 4a...first filter plate body, 4b...second filter plate body,
5. Stock solution supply pipe, 6. Stock solution discharge pipe, 7. Concentrated stock solution supply pipe, 8. Stock solution supply port, 9. Stock solution discharge port, 10.
...Concentrated stock solution supply port, +1.12.14...Through-hole for filtrate discharge, 13...Through-hole for compressed fluid supply, I 5,1
7.18, 20.54...Aperture, 16. +9.21.
55...Communication path, 22.53...Surface plate, 23.53.
・Bolt, 24... Filter cloth, 25 Back plate, 26... Pressed membrane,
27・Pin, 30 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: Aohaku Ao and 2 others Figure 5 Figure 6

Claims (6)

[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) and a plurality of filtration concentration members (3, 32, 33
), a tightening member (2) that tightens the filtration and concentration member to one of the stands, and a tightening member (2) that is arranged between the adjacent filtration and concentration members (3, 32, 33) and each of the filtration and concentration members (3, 33). A pair of filter cloths (24) having through holes communicating with the through holes (8, 9, 10) of the filter concentrating members (3, 32), and the tightening member (2)
, 33) of each filtration and concentration member (3, 32, 33) is tightened against one stand.
a stock solution supply pump (P1) that supplies the stock solution to the pump (P1) and each filtration and concentration member (3, 32, 33);
) is connected to the concentration section (61) of the stock solution concentration line (L1
), and the concentrating part (
61) is passed through each filtration/concentration member (3, 32,
The stock solution filtration line (L
2.L4) A filtration and concentration device characterized by comprising: (2) The above-mentioned stock solution filtration line (L2, L4) is provided with a concentrated stock solution supply pump (P2) that supplies the concentrated stock solution to each filtration/concentration member (3, 32, 33). The filtration concentration device described. (3) The filtration section (60) of each of the filtration and concentration members (33) has a frame section (34) and a filtration bed (35) removably disposed within the frame section (34). Or the filtration concentration device according to 2. (4) The filtration and concentration device according to any one of claims 1 to 3, wherein the concentration section (61) of each of the filtration and concentration members (3, 32, 33) is formed in a hollow surrounded by a frame (3j). . (5) The filter cloth (24) according to any one of claims 1 to 4, wherein a portion of the filter cloth (24) facing the concentrating portion (61) of the filtration and concentration member (3) is formed with a rougher mesh than other portions. filtration and concentration equipment. (6) A pressing filter plate (4) is arranged between the adjacent filtering and concentration members (3, 32, 33), and the pressing filter plate (4) is arranged between the pressing filter plate (4) and the filtering and concentration member (3, 32, 33) The filtration and concentration device according to any one of claims 1 to 5, further comprising a filter cloth (24).