JPH0622647B2 - Filtration concentration plate and filtration concentration unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a filtration concentration plate provided with a concentrating section for concentrating a stock solution to a predetermined concentration and a filtering section for filtering the stock solution concentrated by the concentrating 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.

2. Description of the Related Art Conventionally, various types of filter concentrators are known. For example, a part of the undiluted solution is filtered by a filter medium covering the channel while passing through the channel, and the filtered filtrate is discharged through the filtrate outflow channel, while the undiluted solution passing through the channel is gradually concentrated. It is known that the concentrated stock solution is discharged from the end of the flow path (Japanese Patent Publication No. 40-7433).

The concentrated stock solution concentrated by the above concentrating device is further supplied to a filtering device such as a filter press provided separately from the above concentrating device to be dehydrated and separated into a solid content and a liquid content. If the solid content concentration in the initial stock solution is, for example, 1% or less, and if it is supplied to the filtration apparatus as it is, it is not preferable from the viewpoint of the efficiency of the filtration apparatus. It is supplied to the filtration device after being concentrated to various concentrations.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the structure described above, since the concentrating device and the filtering device are provided separately, separate installation locations are required, and the power source of the device is also separate, which is uneconomical. There was a case where it became.

Therefore, an object of the present invention is to solve the above-mentioned problems, so that the concentrating device and the filtering device can be combined into one device, the installation place and the power source can be reduced, and the device is compact. Another object of the present invention is to provide a filtration / concentration plate and a filtration / concentration unit that are highly economical.

Means for Solving the Problems In order to achieve the above object, a filtration concentration plate according to the present invention includes a concentration unit for concentrating a stock solution and a filtration unit for filtering a stock solution concentrated by the concentration unit. It consists of.
That is, in the concentrated bed of the concentrating section recessed portion, which is movably arranged between the front and rear stands, and which has at least the undiluted solution supply through hole and the undiluted solution discharging through hole, and the filtering bed of the concavity for the filtering section. And a stock solution filtering section having a concentrated stock solution supply through-hole.

In the above-mentioned composition, the above-mentioned filtration part can also be constituted so that it may have a frame part and a filtration bed which is arranged in the frame part so that removal is possible.

Further, in the above configuration, the concentrating portion may be formed to be hollow surrounded by the frame.

Further, in the above configuration, the concentrating portion and the filtering portion may be configured such that their surfaces are covered with a squeeze membrane, and the squeezing membrane of the filtration portion is expandable during squeeze filtration. .

Further, in order to achieve the above object, in the filtration / concentration unit according to the present invention, filter cloths are respectively arranged before and after the filtration / concentration plate, and each filter cloth has a portion opposite to the concentration portion of the filtration / concentration plate. It is configured such that it is formed to have a coarser grain than the portion.

Effects of the Invention In the above-mentioned configuration, the filtration concentration plate or the filtration concentration unit is fastened to one of the front and rear stands, and then the stock solution is supplied to the concentration section of each filtration concentration plate to perform concentration treatment. After that, the concentrated stock solution is supplied to the filtration section of each filtration concentration member to perform the filtration process. When the filtration process is completed,
The fastening of the filtration concentration plate is released, the spaces between the filtration concentration plates are opened, the cake is discharged, and the next concentration / filtration process is prepared.

EFFECTS OF THE INVENTION According to the above configuration, even a stock solution having a low concentration of, for example, 1% or less, which has been difficult to process with a conventional filtration apparatus, is concentrated to a desired solid content in the concentration section of the filtration concentration plate. Since the concentrated stock solution can be filtered by the filtration section, the filtration process can be performed easily and efficiently. Further, the concentrating unit and the filtering unit can be incorporated in one filtration concentrating plate, the concentrating device and the filtering device can be combined into one device, and the installation place and the power source can be reduced. It will be compact and economical.

Example Hereinafter, an example according to the present invention will be described in detail with reference to FIGS.

The filtration concentrating device having the filtration concentrating plate according to the present embodiment,
As shown in FIGS. 1 and 2, a filter plate 3 and a press filter plate 4 are alternately provided between a fixed plate 1 on one stand side and a tightening plate 2 on the other stand side between front and rear stands (not shown). The filter plate 3 and the pressing filter plate 4 are arranged so as to be movable and are adjacent to each other.
After disposing a pair of filter cloths 24, 24 between them and moving the tightening plate 2 to tighten the filter plate 3 and the pressing filter plate 4 to the fixed plate side with the tightening plate 2, the filter plate 3 The stock solution is supplied to the concentrating section 61 to be concentrated, and the concentrated stock solution is supplied to the filtering section 60 of the filter plate 3 to perform filtration. On the other hand, after completion of the filtration, the tightening plate 2 is moved to perform filtration. The plate 3 and the press filter plate 4 are opened so that the cake held between the pair of filter cloths 24, 24 is discharged.

The filter plate 3 is the filtering and concentrating plate, and as shown in FIGS. 3 and 4, is composed of a quadrangular plate-shaped member having a quadrangular frame 3b on the periphery thereof, and is filtered on the front and back surfaces from the central part to the lower part. The part 60 is formed. The filter section 60 is formed so as to penetrate through the filter bed 3a having a plurality of ribs 3f, ..., 3f that are recessed from the frame 3b and that form a plurality of vertical filtrate discharge grooves. The concentrated stock solution supply port 10 is provided. Handles 3d, 3d are formed on both sides of each filter plate 3, and a filtrate discharge through-hole 11 and a compressed fluid supply through-hole 13 are formed on the upper part of the handle 3d.
Through-holes 12 and 1 projecting from the lower corners of the filter and discharging the filtrate
Forming an ear with four. The filtrate discharge through-hole 11 above one of the handles 3d communicates with the four small openings 18, ... 18 of the filter bed 3a by communication passages 19, ..., 19 formed in the handle 3d and the filter plate, respectively. Then, the filtrate is collected from the filtration bed 3a to the filtrate discharge through-hole 11 through the opening 18 and the communication passage 19. The compressed fluid supply through-hole 13 on the other hand of the other handle 3d is used as a passage for supplying the compressed fluid of the compression filter plate 4. Also, one of the through holes 12 for discharging the filtrate below the filter plate has a communication passage 21 formed in the filter plate.
..., 21 by the four small openings 2 of the filtration bed 3a
0, ..., 20 respectively, and the filtrate is collected from the filtration bed 3a to the filtrate discharge through hole 12 through the opening 20 and the communication passage 21. The other filtrate discharge through hole 14 below the filter plate is
A communication passage (not shown) formed in the press filter plate communicates with a small opening (not shown) of the compression membrane 26, respectively, and the filtrate from the compression membrane 26 penetrates through the opening and the communication passage to discharge the filtrate. Collect in mouth 14.

On the upper part of the filter plate 3, the concentration part 61 separated from the filtration part 60 by the frame 3c is arranged. This concentrating section 61
Is provided with a concentrated bed 3e provided with a plurality of ribs 3g, ..., 3g that are recessed in a generally oblong rectangular shape and that form a plurality of filtrate discharge grooves along the vertical direction, and one end of the concentrated bed 3e in the lateral direction. A stock solution supply port 8 is formed so as to penetrate therethrough, and a stock solution discharge port 9 is formed at the other end thereof. , 15 are formed in this concentrated bed 3e, and four small openings 17, ..., 17 are also formed in the filtration bed 3a. The filtrate collected in the concentrated bed 3e through the opening 15 passes through the communication passage 16 into the filtration bed 3a through the opening 17, and the filtrate discharge openings 18 and 20 of the filtration bed 3a and the communication passage 19, Two
1 is collected in the through holes 11 and 12 for discharging the filtrate. In this embodiment, as described above, the filtrate discharge route of the concentrated bed 3e uses the filtrate discharge route of the filter bed 3a. However, the filtrate discharge passage of the concentrated bed 3e is directly connected to the filtrate discharge through hole 11 or the like. It is also possible to form a discharge path exclusively for the concentration bed for discharging the filtrate through the communication passage.

The pressing filter plate 4 has substantially the same shape as that of the filtering plate 3, and the front and rear surfaces of the pressing filter plate 4 are fixed with pins 27, ..., 27 without forming ribs on the filtering bed portion. It becomes. When the compressed fluid is supplied, the portion of the compressed film 26 that faces the filtration portion 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 discharged. I try to be squeezed.

Each filter cloth 24 is arranged between the filter plate 3 and the pressing filter plate 4 which are adjacent to each other. The filter cloth 24 and the filter plate 3 constitute a filter concentration unit according to the present embodiment. The mesh of the filter cloth may be rougher than the portion facing the concentrating section 61 or may be a filter cloth having the same roughness over the entire surface, depending on the properties of the stock solution and the like. Each of the filter cloths 24 has a through hole 24 which communicates with the concentrated stock solution supply ports 10 and 28 of the filter plate 3 and the press filter plate 4 at a portion facing the filter section 60.
In addition to the formation of a, through-holes 24b and 24c are formed in the portion facing the concentrating portion, which communicate with the stock solution supply port 8 and the stock solution discharge port 9 of the filter plate 3 and the press filter plate 4, respectively.

Through hole 2 communicating with the undiluted solution supply port 8 and undiluted solution discharge port 9
4b and 24c, as shown in FIGS. 5 and 6, a back plate 25 is arranged on the filter plate 3 or the pressing filter plate 4 side, and a front plate is placed so as to face the back plate 25 with the filter cloth 24 in between. 22 are arranged, the plates 25, 22 are fixed to the filter cloth 24 by the bolts 23, ..., 23, and the plates 22 and 25 form a lip member. The surface plate 22 is made of a plate material in which one end of a square plate is curved, has an opening 22a communicating with the stock solution supply port 8 or the stock solution discharge port 9 in the center, and has a recess 22b on the side opposite to the curved side. Form and filter plate 3 or press plate 4
The undiluted solution supplied from the undiluted solution supply port 8 through the through hole 24b of the filter cloth 24 to the opening 22a of the surface plate 22 is
Feed via 2b to the concentrate bed 3e. The concentrated concentrated undiluted solution passes through the recess 22b of the surface plate 22 arranged on the other undiluted solution outlet side from the opening 22a to the through hole 24 of the filter cloth 24.
It is discharged to the stock solution discharge port 9 via c. When the filter plate 3 and the press filter plate 4 are tightened by the tightening plate 2, recesses 3m are formed in portions of the filter plate 3 facing the concentrated bed 3e and the back plate 25 of the press filter plate 4, respectively. The back plate attached to the filter cloth 24 is fitted in the recess 3m.

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

1 and 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 squeezing filter plate 4, and each filter. Undiluted solution outlet 6 communicating with undiluted solution outlet 9 of concentrating portion 61 of plate 3 and undiluted solution outlet 9 of squeezing filter plate 4, concentrated undiluted solution supply port 10 of each filter plate 3 and concentrated undiluted solution of each squeezing filter plate 4. The concentrated stock solution pipe 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 V1.
Via the undiluted solution supply line L1 through the undiluted solution tank T1
Connected with. An air supply line L6 is provided between the control valve V1 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 and the like. The stock solution may be blown off.

The stock solution discharge pipe 6 is connected to the stock solution recovery tank T2 by a stock solution recovery line L2 via a turbidimeter D and a control valve V2. A repeat line L3 for returning to the stock solution tank T1 via a control valve V3 is provided between the turbidity meter D of the stock solution supply line L2 and the control valve V2, and the concentrated stock solution concentrated in the concentrating section 61 is again provided. It is supplied to the concentration section 61 so that it can be further concentrated. The turbidimeter D is connected to the control valve V3 and the control valve V2 to the flow path control units C1 and C2, respectively. The turbidimeter D determines whether or not the stock solution is concentrated to a desired concentration. Determine. Therefore, when the stock solution is lower than the desired value, the flow rate control units C1 and C2 close the control valve V2 and open the control valve V3 to open the repeat line L.
The undiluted solution that has once passed through the concentrating section 61 by 3 is returned to the undiluted solution tank T1 and again supplied from the undiluted solution supply pipe 5 to the concentrating section 61 of the filter plate 3 for concentration. On the other hand, if the concentrated stock solution is at or above the desired value,
The flow rate control units C1 and C2 open the control valve V2 and close the control valve V3 to collect the concentrated stock solution into the stock solution recovery tank T2. The control valves V2 and V3 are
It is desirable to be able to switch manually. 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, and 14 of the filter plates 3 and the press filter plates 4 are connected to the filtrate tank T3 via a control valve V5 by a filtrate discharge line L5.

Further, each compressed fluid supply port 1 of each filter plate 3 and each compressed filter plate 4
3 is a compressed fluid supply / discharge line L7 having a connection valve V7
Are connected.

According to the above-mentioned composition, the filtration concentrating device concerning this example operates as follows. Note that examples of the undiluted solution include flow water, factory sewage, household sewage, or liquid components in the chemical recovery process of a chemical factory.

First, from the stock solution tank T1 through the stock solution supply pump P1 through the stock solution supply line L1 and the control valve V1, from the stock solution supply pipe 5 through the squeeze filter plates 4 and the stock solution supply ports 8 of the filter plates 3, the concentrating portion 61 of each filter plate 3 is provided. Supply undiluted solution to. In the concentrating section 61 of each filter plate 3, the 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 pressing filter plate 4 facing the concentrating section 61. The undiluted solution is supplied from the undiluted solution supply port 8 on one end side of the filter, the filtrate is discharged from between the filter cloth 24 and the filter plate 3 or the squeezing filter plate 4, and the undiluted solution is filtered.
4 is moved to the other end side of the concentrating chamber and concentrated, and the concentrated stock solution is discharged from the stock solution discharge port 9 at the other end to the outside of the concentrating section. The concentrated stock solution discharged from the concentrating section 61 is collected in the stock solution recovery tank T2 through the stock solution recovery line L2, the turbidimeter D, and the control valve V2. In addition, the filtrate portion filtered through the concentrated bed 3e is the filtrate discharge opening 1 in the concentrated bed 3e.
5, 15 through the communication passages 16, ..., 16 that open to the filter bed 3a of the filter section 60 to pass over the filter bed 3a, and further the filtrate discharge openings 1 at the upper and lower portions of the filter bed 3a.
8, ..., 18; 20, ..., 20 to communication passage 19 ,.
9; 21, ..., 21, through holes 11,1 for discharging filtrate
2 and collected in the filtrate tank T3 through the filtrate discharge line L5. Further, it is determined whether or not the concentrated stock solution is concentrated to a desired concentration while passing through the turbidimeter D on the concentrated solution recovery line L2 that has exited the stock solution discharge pipe 6. If the concentration of the concentrated stock solution is still lower than the desired value, the concentrated stock solution is introduced to the original stock solution tank T1 through the repeat line L3 by closing the control valve V2 and opening the control valve V3. , Is again supplied to the concentrating section 61 for concentration. Further, when the concentration of the concentrated stock solution is increased to a desired value, the concentrated stock solution is controlled by the control valve V
2 is opened and the control valve V3 is closed, so that the stock solution is recovered in the stock solution recovery tank T2 by the stock solution circuit line L2 without passing through the repetition line L3.

The concentrated stock solution having a desired concentration and collected in the stock solution recovery tank T2 is supplied from the concentrated stock solution supply line L4 and the control valve V4 by the concentrated stock solution supply pump P2 from the concentrated stock solution supply pipe 7 to the filtering unit 60 of each filter plate 3. 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 press filter plate 4, and the known filtration is performed. Alternatively, press filtration is performed. The filtrate content is recovered from the filtrate discharge line L5 to the filtrate tank T3. The filtrate tank T3 is also used as a tank for collecting the filtrate collected from the concentrating section 61, but the present invention is not limited to this, and a filtrate tank for the concentrating section may be separately provided. The cake formed between the filter cloths 24, 24 between the filter bed 3a of the filter plate 3 and the pressing filter plate 4 facing the filter plate 3 is released from the tightening by the tightening plate 2 and then the filter plate 3 and the press filter plate 4 are removed. Open the plate and eject. Further, when the filter cloths 24 and 24 are opened by opening the filter cloths 24 and 24, the filter cloth 24 and the filter portion 6 covering the concentrating portion 61 of the filter plate 3 are opened.
Since the filter cloth 24 covering 0 is one at a time, the filter cloth 24 can be cleaned by the concentrating section 61 and the filtering section 60 at the same time, and both can be cleaned in one stroke.

According to the above-mentioned embodiment, even a low-concentration stock solution having a low concentration of 1% or less, which has been difficult to process by the conventional filtration device, can be processed up to a desired solid content in the concentration section 61 of the filter plate 3 as a filtration concentration member. After concentrating, the concentrated stock solution is filtered by the filtration unit 60.
Since it can be filtered with, it is possible to easily and efficiently perform the filtration treatment. In addition, the concentration section 61 and the filtration section 6
0 and 0 can be incorporated in one filtration / concentration plate 3 or a filtration / concentration unit, the concentration device and the filtration device can be combined into one device, and the installation place, power source, and control unit can be reduced. It can be made compact and has excellent economical efficiency.

The present invention is not limited to the above embodiment,
It can be implemented in various other modes. For example, as shown in FIG. 3, the filter plate 3 in which the concentrating portion 61 and the filtering portion 60 are integrally formed.
Not limited to this, as shown in FIGS. 7 and 8, the second filter plate 31 having the concentrating part 61 on the upper part of the first filter plate 32 having only the filter part 60 is made detachable with bolts 30 ,. You can also combine them. In this case, the squeezing filter plate 4 similarly,
The first filter plate body 4a facing the filtering unit 60, and the concentrating unit 61.
Both members 4a and 4b are divided into a second filter plate body 4b facing the
Is preferably detachably connected with a bolt or the like. Therefore, in this example, when the concentrating section 61 is unnecessary, the second filter plate 31 and the second filter plate main body 4b can be removed to be used as a normal filtering device.

Further, the concentrating section 61 is not limited to the one arranged above the filtering section 60, and as shown in FIGS. 9 and 10, the concentrating section 61 can be provided below the filtering section 60. At this time, the surface plate of the lip member is an annular plate 52, and the annular plate 52 and an annular back plate (not shown) are fixed to the filter cloth 24 by bolts 53 ,. In this example, four small filtrate discharge openings 54, ..., 5 are provided in the concentration bed 3e of the concentration section 61.
4 is formed, and the opening 54 communicates with the filtrate discharge through-hole 14 through the communication passage 55.

Further, the concentrating section 61 may be located on the side of the filtering section 60. The shape of the filter plate 3, the concentrating portion 61, and the filtering portion 60 may be any shape such as a round shape as well as a square shape.

Further, the filter plate 3 and the press filter plate 4 are not limited to being arranged alternately, but may be configured as a non-pressing type filter concentrating device including only the filter plate 3.

Further, as shown in FIGS. 11 and 12, the filter portion 60 of the filter plate 33 may be composed of a frame member 34 and a filter floor member 35 engaged in the frame member 34. In this case, mounting pieces 35b, ..., 35b projecting alternately in the front and rear are formed around the rectangular plate-shaped filtration floor member 35, and the mounting pieces 3
, 35b are removably attached to the edge of the rectangular opening 36 in the frame 3i of the frame member 34. The filter bed member 35 is not limited to a flat plate, a perforated plate, or a corrugated plate made of polypropylene, vinyl chloride, wood, metal, or the like, and may be a mesh. In addition, 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 discharged smoothly. Further, the concentrating portion 61 of the filter plate 33 may be formed in a hollow surrounded by the frame 3j.

Further, when 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 DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view showing a filtration concentrating device according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a relationship between a filter plate of the above device and a filtrate discharge line, 3 is a front view of the filter plate, FIG. 4 is a sectional view taken along line AA of FIG. 3, FIG. 5 is a longitudinal sectional view of the filter plate of FIG. 3, and FIG. 6 is B- of FIG. B line sectional view, the seventh,
FIG. 8 is a front view and a vertical sectional view of a filter plate of a filtration and concentration device according to another embodiment, and FIGS. 9 and 10 are front views of a lower portion of a filter plate of a filtration and concentration device according to still another embodiment, respectively. Transverse sectional views, FIGS. 11 and 12 are a front view and a 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 ... Frame, 3d ... Handle, 3e ... Concentrated bed, 3f, 3g ... Rib, 4 ... Squeezing filter plate, 4a ... 1st filter plate body, 4b ... 2nd Filter plate body, 5 ... undiluted solution supply pipe, 6 ... undiluted solution discharge pipe, 7 ... concentrated undiluted solution supply pipe, 8 ...
Undiluted solution supply port, 9 ... Undiluted solution discharge port, 10 ... Concentrated undiluted solution supply port, 11, 12, 14 ... Filtrate discharge through port, 13 ...
Through port for supplying compressed fluid, 15, 17, 18, 20, 54
...... Opening, 16,19,21,55 ...... Communication passage, 22,
53 ... front plate, 23, 53 ... bolts, 24 ... filter cloth, 25 ... back plate, 26 ... compressed film, 27 ... pin, 3
0 ... Bolt, 31 ... Second filter plate, 32 ... First filter plate,
33 ... Filtration and concentration member, 34 ... Frame member, 35 ... Filtration floor member, 60 ... Filtration unit, 61 ... Concentration unit.

Claims (5)

[Claims] 1. A stock solution which is movably arranged between front and rear stands and has at least a stock solution supply through hole (8) and a stock solution discharge through hole (9) in a concentrate bed (3e) of a recess for a concentrate section. Concentration section
A filtration and concentration plate comprising (61) and a stock solution filtration section (60) having a concentrated stock solution supply through hole (10) in the filtration bed (3a, 35) of the filtration section recess. 2. The filtering part (60) includes a frame part (34) and the frame part (34).
A filter plate according to claim 1 or 2 having a filter bed (35) removably disposed therein. 3. The filtration concentration plate according to claim 1, wherein the concentration part (61) is formed in a hollow surrounded by a frame (3j). 4. The filtration / concentration plate according to claim 1, wherein the concentrating section and the filtering section have their surfaces covered with a squeezing membrane, and the squeezing membrane of the filtering section is expandable during squeezing filtration. 5. A filter cloth (24) is arranged before and after the filtration / concentration plate according to any one of claims 1 to 4, and each filter cloth (24) is a concentration part of the filtration / concentration plate (3). The filtration and concentration unit according to any one of claims 1 to 4, wherein a portion facing (61) is formed to have a coarser pattern than the other portions.