JPH028764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filtration method for solid-liquid separation of a liquid to be treated.

[Conventional technology]

Conventionally, as shown in FIG. 8, this type of filter has a frame 1 having a liquid discharge hole 1A formed in its lower edge;
As shown in FIG. 9, a plate 3 consisting of a plate body 2 stretched in the frame 1 and having liquid guide grooves 2A carved on both sides and an introduction hole 2B for the liquid to be treated in the center is attached to a cloth 4 as shown in FIG.
A chamber 3A surrounded by a cloth 4 is formed between the plates 3, and the liquid to be treated is introduced into each chamber 3A from the introduction path formed by the introduction hole 2B of the frame 1.
The liquid was press-fitted into the frame 1 and passed through the cloth 4, and the liquid was allowed to flow downward through the liquid guide groove 2A of the plate body 2, and was discharged from the liquid drain hole 1A of the frame 1.

[Problem that the invention seeks to solve]

However, in the above conventional example, only the liquid pressure of the liquid to be treated is applied to the chamber 3A.
There was a problem in that the cake accumulated in A was not sufficiently dehydrated, and the cake after the over-step process had to be dehydrated using another device such as a compressor or a centrifugal separator.

[Means for solving problems]

As a means for solving the above-mentioned conventional problems, the present invention provides the plate 10 with perforated plates 21A and 2 on the inner surface.
1B is stretched and sandwiched openably and closably by a pair of end plates 20A, 20B with liquid discharge passages 22A, 22B communicating therein.
A belt-shaped material that is pulled out from the feed roll and wound up on a take-up roll is interposed between the frame 11 and the frame 11, and a high-pressure air introduction passage 15 is connected to the introduction passage 14 for the liquid to be treated that leads into the frame 11. Further, using the filter, the liquid to be treated is press-fitted into the frame 11 of the plate 10 from the introduction path 14 of the liquid to be treated and filtered through the material, and the liquid is passed through the perforated plate 20A from the material. , 20B to the hollow end plates 20A, 2
An over-step where the liquid flows into 0B and is discharged from the discharge paths 22A and 22B, and an introduction path 1 for the liquid to be treated from the high-pressure air introduction path 15 after the over-step.
4, which dehydrates the cake by applying pressure to the cake accumulated on the material;
A compression dehydration step in which the cake is compressed and dehydrated by expanding the material, and the overused portion of the material is pulled out from between the plate and the end plate to remove the cake accumulated in the material portion and dehydrated again. A regeneration super-dehydration step in which the material portion is returned between the plate and the over-end plate and similarly over-dehydrated; and after the regeneration over-dehydration step is repeated a predetermined number of times, the material portion is pulled out from between the plate and the over-end plate. The purpose of the present invention is to provide a method comprising a renewed over-dehydration step in which a new material portion is interposed between the plate and the over-end plate and over-dehydration is carried out in the same manner.

[Effect]

The effects of the present invention based on the above configuration are as follows.

When the liquid to be treated is forced into the frame of the plate from the introduction path of the liquid to be treated, filtration is performed by the material, the liquid flows into the end plate through the perforated plate, and is discharged from inside the end plate to the drainage path. Cake builds up on the wood. After the step, when pressure is applied to the cake from the high-pressure air introduction path through the liquid to be treated introduction path, the pressure spreads to the gaps between the solid particles of the cake, and the liquid present in the gaps is expelled. Further, after the aeration and dehydration step, when pressure is applied to the air bag from the high-pressure air supply path to inflate the air bag, the cake is squeezed between the surfaces of the air bag in the same direction as the air bag, and the liquid contained in the cake is removed.

In this way, the first over-dehydration process is completed, but after that, the overused part of the material is pulled out from between the plate and the end plate, and the cake accumulated on the material part is removed. After regenerating the portion, the material portion is returned between the plate and the end plate and the over-dehydration process is repeated. If this process is repeated a certain number of times, the material will become clogged and difficult to regenerate, so at that point the material will be pulled out, a new material will be inserted between the plate and the over-end plate, and the over-dehydration process will be repeated. .

〔Effect of the invention〕

Therefore, in the present invention, the liquid contained in the cake produced by the passing process is efficiently removed through the two-stage dehydration process of aeration dehydration and press dehydration, so there is no need for subsequent cake dehydration using a separate device. In addition, the material can be easily recycled and renewed, and the excessive dehydration process is saved both in terms of equipment and process.

〔Example〕

To explain the present invention with reference to an embodiment shown in FIGS. 1 to 7, the plate 10 shown in FIG.
and an air bag 12 stretched within the frame 11.
and a high pressure air supply path 13 leading to the air bag.
and an introduction path 14 for the liquid to be treated that communicates within the frame 11.
As shown in FIG. 2, the air bag 12 is fixed at the top and bottom by fixing pieces 11A of the frame 11.

3 and 4 show a filter machine using the plate 10. In the figure, a pair of end plates 20A and 20B are arranged on both sides of the plate 10, and a hydraulic cylinder 3 is provided on the back surface of one end plate 20A.
0 is connected and the over end plate 20A is connected to the hydraulic cylinder 3.
0 allows reciprocating sliding in the direction of the arrow I in FIG. 3. As shown in FIG. 5, the end plates 20A and 20B have perforated plates 21A and 21B made of wire mesh, punching board, etc. stretched on their inner surfaces, and liquid discharge passages 22A and 22B communicate with each other inside. Further, guide rods 25 and 26 for guiding a material such as cloth or paper are extended to brackets 23 and 24 extended from the upper and lower edges of one end plate 20A. A valve 1 is installed in the high pressure air supply path 13 of the plate 10.
3A, and the introduction path 14 is connected to a pump 14A and a valve 14B, and further communicated with a high-pressure air introduction path 15 having a valve 15A. Board 1
Paper 40A, 40B as a band-shaped material is interposed between 0 and the end plates 20A, 20B, and the paper 4
0A is from feed roll 41A to guide roll 42A
between the plate 10 and the end plate 20A via the sixth
As shown in the figure, the paper 40B passes through it while being guided by the guide rods 25 and 26, and is taken up by the take-up roll 44A via the guide roll 43A.
passes from the feed roll 41B through the guide roll 42B between the plate 10 and the edge plate 20B, and then passes through the take-up roll 44 through the guide roll 43B.
It is wound up by B. And guide roll 43A,
Scrapers 50A and 50B are placed in contact with the papers 40A and 40B near 43B. Further, the solution discharge passages 22A and 22B of the end plate 20A are combined to form a solution discharge passage 22, and a cake receiver 60 is arranged below the filter.

In the above configuration, the over-end plate 20A is pushed by the hydraulic cylinder 30 in the direction of the arrow A in FIG. 3 to bring the over-end plate 20B, the plate 10, and the over-end plate 20A into close contact with each other to bring the liquid to be treated into the closed state shown in FIG. The valve 14B of the introduction path 14 is opened and the pump 14A is driven to force the liquid to be treated into the frame 11 of the plate 10. The liquid to be treated passes through the papers 40A and 40B, and the liquid flows into the over-end plates 20A and 20B via the perforated plates 21A and 21B.
A, 20B is discharged to liquid discharge paths 22A, 22B and solution discharge path 22. In this way, the overstep is performed, and when the overstep is finished, the valve 14B of the introduction path 14 is closed and the pump 14A is closed.
and close the valve 15A of the high pressure air introduction path 15.
is opened, and the frame 11 of the plate 10 is inserted through the introduction path 14.
Pressure is exerted on the cake that has accumulated on the papers 40A, 40B within. In this way, the liquid to be treated remaining in the introduction path 14 and the liquid present in the gaps between the solid particles of the cake are driven out by the pressure and are discharged as liquid from the end plates 20A, 20B to the liquid discharge paths 22A, 22.
B, 22. After completing the aeration and dehydration process, the valve 13A of the high-pressure air supply path 13 is opened to apply pressure inside the air bag 12, which expands the air bag 12 and compresses the cake between the air bag 12 and the papers 40A and 40B. The liquid still contained in the cake is squeezed out as liquid from the end plates 20A, 20B to the liquid discharge path 22A,
22B, 22. When the pressing and dewatering process is thus completed, the over-end plate 20A is pulled in the direction of the arrow B in FIG. 3 by the hydraulic cylinder 30 to open it as shown in FIG. When you pull it out to the 44A, 44B side, the cake attached to that part of the paper 40A, 40B is removed by scrapers 50A, 50B.
and falls into the cake receiver 60.
After regenerating the overused portions of the papers 40A and 40B in this way, the portions are reused on the overend plate 20A.
and the plate 10, and between the end plate 20B and the plate 10, and perform the same excessive dehydration process. If such retreading and dewatering process is repeated a predetermined number of times (usually 3 to 4 times), the portions of the paper 40A, 40B will become clogged and recycling will become difficult.
and plate 10, and between end plate 20B and plate 1
0 and take-up rolls 44A, 44B
When you wind it up, the end plate 20A and the plate 10
Between the edge plate 20B and the plate 10, new paper 40A, 40B is fed from the feed rolls 41A, 41B.
parts are sent. In this way, paper 40
After updating parts A and 40B, a similar over-dehydration process (renewal over-dehydration process) is performed again. Note that paper 4
0A guide roll 42A to guide roll 43
If the length to A is kept constant between the open state shown in Fig. 3 and the closed state shown in Fig. 4, the paper 40A will not be stretched or loosened by opening and closing of the mechanism. .

In addition to the above-mentioned embodiments, in the present invention, a plurality of overhang plates and plates 10 each having a perforated plate on both sides are arranged alternately, and overend plates 20A and 20B are provided at both ends.
Alternatively, the conventional plates and the plates of the present invention as shown in FIG. 8 may be arranged alternately.
Furthermore, the winding roll may be omitted and the used paper may be folded as is or may be cut and disposed of. Furthermore, cloth may be used instead of paper.

[Brief explanation of drawings]

Figures 1 to 7 show one embodiment of the present invention. Figure 1 is a front view of the plate, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view of the plate in the open state. Schematic diagram of the machine, Fig. 4 is a schematic diagram of the machine in the closed state, Fig. 5
The figures are a sectional view of the vicinity of the plate in the closed state, Figure 6 is a perspective view of the end plate, Figure 7 is a side sectional view of the end plate, Figure 8 is a front view of the conventional plate, and Figure 9 is the same. It is a sectional view of an assembled state. In the figure, 10... board, 11... frame, 12...
Air bag, 13... High pressure air supply path, 14...
...Introduction path for liquid to be treated, 15...Introduction path for compressed air, 20A, 20B...End plate, 21A, 21
B... Porous plate, 22, 22A, 22B... Liquid discharge path.

Claims (1)

[Claims] 1. A frame, an air bag stretched within the frame, and a high-pressure air supply path leading to the air bag,
A plate consisting of an inlet passage for the liquid to be treated leading into the frame is sandwiched openably and closably between a pair of over-end plates with a perforated plate on the inner surface and connected with a liquid discharge passage, and the plate and the over-end plate are A strip of material is interposed between the frames, and a filter is used to connect the introduction path for the liquid to be treated with a compressed air introduction path, and the liquid to be treated is passed through the plate from the introduction path for the liquid to be treated. A passing process in which the liquid is forced into the frame of the material and passed through the material, the liquid flows from the material into the end plate through the perforated plate and is discharged from the liquid discharge passage, and after the passing process, it is passed through the high pressure air introduction passage. An aeration dehydration step in which pressure is applied to the cake accumulated on the material through the introduction path of the liquid to be treated to dehydrate the cake; and after the aeration dehydration step, pressure is applied to the air bag from the high-pressure air supply path to dehydrate the cake. A compression dehydration step in which the cake is compressed and dehydrated by inflating an air bag, and the overused portion of the material is pulled out from between the plate and the over-end plate to remove the cake accumulated in the material portion and then reused. A regeneration super-dehydration step in which the material portion is returned between the plate and the over-end plate and excessive dehydration is performed in the same manner, and after the regeneration over-dehydration step is repeated a predetermined number of times, the material portion is pulled out from between the plate and the over-end plate. and a renewed over-dehydration step in which a new material section is interposed between the plate and the over-end plate and over-dehydration is carried out in the same manner.