JPS6257622A - Electroosmotic dehydrator - Google Patents

Abstract

PURPOSE:To efficiently carry out dehydration by expanding an elastic member to allow an electrically conductive plate on the anode side to approach the cathode side and conducting a DC current while reducing the interval between both conductive plates when an unfiltered liq. in a filter chamber is dehydrated by electroosmosis. CONSTITUTION:An electrically conductive plate 4 on the cathode side is provided on the opposite surface of a filter plate 1 and a conductive plate 5 on the anode side is furnished on the surface of a squeeze filter plate 3 opposite to the filter plate 1, filter cloths 6 and 6 are laid over filter frames 2 and 2 to cover both faces, the filter frame 2 is inserted between the filter plate 1 and the squeeze filter plate 3 and a filter chamber 7 is formed. An unfiltered liq. is forced into the filter chamber 7, a DC voltage is impressed on the conductive plates 4 and 5, compressed air is introduced to expand an elastic membrane 18 and the conductive plate 5 is moved. The liq. component is passed through the filter cloth 6 on the cathode side and discharged from a filtrate recovery passage of the filter plate 1. The solid component is drawn to the anode side, remains in the filter chamber 7 and is subjected to electroosmotic dehydration.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electroosmotic dewatering apparatus that performs filtration by passing a direct current through a raw solution such as sludge to be filtered.

Conventional Technology It has long been known that when direct current is passed through sludge during filtration or pressurized dewatering, water in the sludge moves to the outside through electroosmosis, promoting dewatering. Ori,
Attempts have been made to use electroosmosis in combination with various dehydrators.

As an example, if sludge is sandwiched between two moving filter cloths,
There is a belt press type pressure dehydrator that performs continuous dehydration treatment that also uses electroosmosis. In this case, there is a problem that the energization time is insufficient, and the thickness, water content, electrical resistance, etc. of the sludge change as the filter cloth runs, resulting in uneven current distribution. On the other hand, with a four-section pressure dehydrator such as a filter press, there are fewer problems such as those mentioned above, so it is most effective to reduce the moisture content of the cake by using both pressure and electroosmosis. . An example of a filter press using electroosmosis is the following (Japanese Patent Publication No. 37-14034).

That is, as shown in FIG. 17, in addition to forming the adjacent conductive furnace plates 40. is sandwiched between both I temporary 40.40 via an insulating backing 44, and between the Y plate 40 and the conductive plate 43, the furnace plate side becomes a pole with the same sign as the charge charged on the sediment particles. The device is configured to charge a DC voltage as shown in FIG. Then, the stock solution is pressurized into the V chamber 42, and in parallel with pressurized dehydration due to the pressure of the stock solution, a voltage is applied between the furnace plate 40 and the conductive plate 43 so that the I plate side is charged with the precipitate particles. DC voltage is applied with the same sign to cause electrophoresis and electroosmosis phenomena, and the precipitate particles move toward the conductive plate, while the liquid moves to the conductive plate on the right side of I and exits the filter chamber. This is to prevent the formation of a hard dehydrated solid layer on the surface of the cloth 41, which would significantly increase the filtering resistance, and to efficiently perform filtering.

Problems to be Solved by the Invention However, in the above structure B, since the distance between the furnace plate and the conductive plate in the door formed between the furnace plates is fixed,
) When the filtration progresses to a certain extent and the liquid in the furnace chamber decreases,
Since the electrical resistance of the sludge increases, it is necessary to maintain a current value sufficient to cause electroosmosis by applying a high voltage between the electrodes. In addition, in the filter chamber, a difference in sludge concentration occurs between the raw solution supply point and other points, and this difference in sludge concentration causes a difference in electrical resistance, making it impossible to obtain a uniform current distribution, making electroosmotic dehydration more efficient. The problem was that I couldn't do it.

Therefore, an object of the present invention is to solve the above-mentioned problem, and even if the filtration progresses and the liquid components in one chamber decrease, it is possible to efficiently perform electroosmotic dehydration on the raw liquid in the furnace chamber. An object of the present invention is to provide an electroosmotic dehydration device.

Means for Solving the Problems In order to achieve the above object, the present invention is configured such that one electrode can be moved relative to the other electrode. That is, a filter chamber surrounded by a filter cloth is formed between adjacent filter plates, and one >PFi is provided with a first conductive plate, while the above one Pfi is connected to the other >Ffi of the furnace plate main body. In addition to providing an elastic membrane on the opposing surfaces, a fluid supply passage is provided to inflate the elastic membrane and supply fluid between the elastic membrane and the >F plate main body. The first conductive plate is provided on the plate main body and is fixed to the outer surface of the elastic membrane so that the first conductive plate moves toward the second conductive plate due to elastic expansion of the elastic membrane, A second conductive plate is provided on the other P plate, and staggered electrodes are connected to the first conductive plate and the second conductive plate, respectively, and a DC voltage is applied to the stock solution in the chamber to perform electroosmotic dehydration on the stock solution. It was configured to do this.

Here, in order to provide the above-mentioned conductive plate on the furnace plate, the furnace plate and the conductive plate may be formed as one piece by making the furnace plate conductive. Also, insert an r frame between adjacent P plates,
The furnace chamber may be made larger.

Awakening to progress l In the above configuration, ? After the stock solution is supplied into the filter chamber surrounded by cloth and filtered, the stock solution supply hole is closed and the fluid is supplied between the filter plate body and the elastic membrane of one filter plate at a pressure higher than the stock solution supply pressure. Then, the elastic membrane is expanded, the first conductive plate is moved to the second conductive plate side, and the stock solution between both conductive plates is further compressed and filtered. A DC voltage is applied to the second conductive plate to perform electroosmotic dehydration on the stock solution in the r chamber. In this way, as dehydration progresses, the distance between the electrodes decreases,
Sufficient current values necessary for electroosmosis are maintained.

Embodiments Below, embodiments of the present invention will be described in detail based on the drawings.

As shown in Fig. 1.2.3, the electroosmotic dewatering apparatus according to this embodiment consists of a pair of filter plates 1.
A pair of filter frames 2.2 are sandwiched between the P frames 2.2 and a pressing furnace plate 3 is sandwiched between the pair of P frames 2.2, and a cathode-side conductive plate 4 is fixed to the opposing surface of each furnace plate 1. , an anode-side conductive plate 5 is provided on the surface of the pressing furnace plate 3 facing the filter plate l, and I cloth 6.6 is hung so as to cover both sides of the furnace frame 2.2, respectively. A chamber 7 surrounded by a filter cloth 6 and 6 is placed within the frame of the door frame 2 by inserting a filter cloth 2 between the filter plate 3 and the compressor filter plate 3 respectively.
After the stock solution is pressurized into the chamber 7, electroosmotic dehydration is performed by applying a DC voltage to the conductive plates 4 and 5, and the liquid components in the stock solution are transferred to the cathode conductive plate side of the filter plate l. The solid components are moved to the outside of the machine through the I cloth 6 and discharged from the filtrate recovery path of the furnace plate 2, and the solid components are drawn to the anode conductive plate side of the compressor 3 and remain in the P chamber 7. This method performs electroosmotic dehydration on the stock solution. In FIG. 1, 15 is a stock solution supply hole, and 30 and 31 are electrode connection terminals, respectively. In addition, in FIG. 3, reference numeral 8 denotes handles 9, 1, 1, 1, filter frames 2, 2, and each handle 9 protruding from both sides of the press door plate 3, respectively. ..., 9
The guide rail on which the slides, IO is the drive device 1! It is a movable plate that moves back and forth by the drive of the drive device 11.
The pressing furnace plate 3 is moved back and forth along the guide rail 8 to close or open the mold relative to the parent plate 12.

As shown in Fig. 4.5, each of the above I temporary 1 has through-holes 22 and 22 for filtrate recovery penetrated through the upper and lower corners of the side surface thereof, respectively.
A large number of vertical grooves 1a communicating with and extending in the vertical direction,...
, la is provided. The above-mentioned side surface having this recessed portion ib has the above-mentioned rectangular shape conductive IfL.
4 to cover the portion 1b, and the outer peripheral edge of the conductive plate 4 is secured to a large number of bolts 13. ..., 13 and the above-mentioned - adhere to the side surface.

This conductive plate 4 has a large number of holes 4a, .
・It enters into the recess 1b through 4a and enters the furnace liquid recovery port 2.
Allow it to be discharged from 2. The conductive plate 4 includes a sixth
．． As shown in FIG. 7, a connecting rod 14 on the cathode side fixed to the furnace plate l is connected. In addition, in FIG. 4, 15 is a through hole for supplying the stock solution, and 21 is a through hole for supplying compressed air.

Furthermore, each of the I-frames 2 has a hole 2a penetrating through the center, and the inner circumferential surface 2b of the hole is connected to the first O.
As shown in the figure, the above hole 2a goes toward the door plate 1 side.
The furnace frame 2 is inclined so that it has a small diameter, and is provided with a stock solution supply hole 15 penetrating the upper corner of the furnace frame 2, and the stock solution supply hole 15 is connected to three through holes 16 as shown in FIGS. ．．
..., 16 to communicate with the hole 2a, so that the stock solution can be supplied from the stock solution supply hole 15 into the hole 2a. In addition,? Of the pair of through holes on the frame work side, the left through hole 21 is for supplying compressed air, and the right through hole 2 is for supplying compressed air.
2 is for recovering I liquid.

Further, as shown in FIG. 12.13, the pressing furnace plate 3 includes four parts 3b on both sides of the door plate main body 3a. A conductive plate support plate 17 having an angular shape is fitted into each of the recesses 3b so as to be able to move in and out of the recess 3b. An elastic membrane 18 covering almost the entire surface of both sides of the pressing furnace plate 3 is hung from the upper side of the pressing door plate, and both ends of the elastic membrane 18 are fixed to the lower end of the ν plate with bolts 19°, 19. The center portion of the membrane 18 is supported by pins 20 and 20 on the top of the I-frame body. The anode-side conductive plate 5 has almost the same shape as the conductive plate support plate 17, and the conductive bolts 25, .
and fix it to the conductive plate support plate I7. The lower corner of the pressing filter plate 3 is provided with an air supply through hole 21.
However, the through hole 24 communicates with the gap 23 formed between the conductive plate support plate 17, the door plate main body 3a, and the elastic membrane 18, and compressed air is supplied into this gap 23 to close the elastic membrane. 18 expands, and the conductive plate support plate I7 moves integrally with the anode side conductive plate 5 toward the conductive plate 4 side with respect to the door plate main body 3a. 2 fixed to the conductive plate 5 and the pressing furnace plate 3
It is elastically connected to the anode side connecting rod 26 of the book. That is, as shown in Fig. 14.15, each connecting rod 2 on the anode side
6 is fixed to the side of the pressing door plate 3, and a flexible shield wire 2 is braided to the other end of the connecting rod 26.
7 is fixed with a conductive bolt 28, while the shield wire 27 is bent into a U-shape and the other end is fixed to the back surface of the conductive plate support plate 17, thereby fixing the support plate 17 and the conductive plate 5. It is fixed with conductive bolts 28a. Therefore, the elastic membrane 18
Even if the conductive plate 5 expands and moves together with the conductive plate support plate 17, the curved portion of the shield wire 27 opens, and the connecting rod 26 and the anode side conductive plate 5 are always connected. do. In addition, in the upper and lower center of each pressing filter plate 3,
6 (a), a pair of holes 3c, 3c are provided, and one end +7b is provided in the hole 17a of the conductive plate support plate 17.
fixes the guide 17c fitted with the guide 17c.
is movably fitted into the hole 3C of the squeeze filter plate 3,
When the conductive plate support plate 17 moves together with the elastic membrane 18,
As shown in FIG. 16(b), the conductive plate 5 is moved parallel to the filter plate surface via the conductive plate support plate 17 by the guide 17C.

Furthermore, the above? The cloth 6.6 is arranged so as to be hung from above on both sides of the compressed cloth 3. In addition, the other r cloth 6 is
Arranged so as to be sandwiched between each furnace plate l and each P frame 2,
Compression) The furnace cloth 6 between the door plate 3 and the furnace frame 2 and the filter cloth 6 between the door plate 1 and the furnace frame 2 create an I chamber 7 surrounded by the filter cloth 6 in the furnace frame 2. The liquid component of the stock solution supplied into the furnace frame 2 passes through the I cloth 6 and is discharged outside the machine from the filtrate collection through hole 22 on the furnace plate L side. The solid components remain in the filter chamber 7.

According to the above configuration, as shown in FIGS. 1, 2(a) and 3, the movable plate 10 is driven by the drive device It.
Move it to the main plate 12 side and tighten each door plate l etc.
As shown in FIG. 2(b), an I chamber 7 surrounded by an R cloth 6.6 is formed in each furnace frame 2, and the stock solution supply holes 15.15 of the filter frame 2 are provided in the two chambers 7. Pressure in the stock solution. Stock solution supply hole 15
．． 15 and press) the elastic membrane 18 of the door plate 3 and the filter plate main body 3
compressed air is supplied to the gap 23 between the filter plate main body 3a and the conductive plate support plate 17 to expand the elastic membrane 18, and as shown in FIG. Integrated with board 5? Move to the plate side and squeeze and filter the stock solution. Then, a DC voltage is applied to the electric plates 4.5 on both sides to cause an electrophoresis phenomenon, and the liquid components in the stock solution are moved to the cathode conductive plate 4 side of the door plate 1, while the solid components in the stock solution are squeezed out. 1 to the anode conductive plate 5 side of the plate 3 to perform electroosmotic dehydration.

The conductive plate 5 and the conductive plate support plate 17 are moved until the conductive plate 5 contacts the inner circumferential surface 2b of the hole 2a of the filter frame 2, and further electroosmotic dehydration is performed. When the electroosmotic dehydration is completed, the movable plate 10 is moved backward by the drive device IT, and the filter plates 1, 1,
57' Frames 2, 2 and compressor 3 are opened, and the cake, which is a solid component in the stock solution, remaining in each filter frame 2 is discharged from the hole 2a of the furnace frame 2. When the discharge of this cake is completed, each Washing the filter cloth 6 a
When the operation is completed, the movable plate 10 is advanced again by the drive device 11, and the door frame 2.2 is moved forward again.
The pressing furnace plate 3 is mold-closed to the parent plate 12 side to prepare for the next electroosmotic dehydration.

I can do it.

Effects of the Invention According to the above configuration, when electroosmotic dehydration is performed on the stock solution in the filtration chamber, the elastic membrane is expanded to bring the conductive plate on the anode side closer to the conductive plate on the cathode side, thereby reducing the gap between both conductive plates. Since direct current was applied between both conductive plates, the electrical resistance of the sludge did not increase significantly, and the current value sufficient to cause electroosmosis could be maintained without applying a high voltage between the electrodes. , to be able to perform efficient dehydration processing.

[Brief explanation of the drawing]

FIG. 1 is a schematic exploded view of essential parts of an electroosmotic dehydration device according to an embodiment of the present invention, and FIGS. 2(a) to (C) are respectively schematic explanations explaining the operation of the electroosmotic dehydration device. Figures 3 and 3 are side views of the electroosmotic dewatering device, Figures 4 and 5 are front views and cross-sectional side views of the door plate, respectively, and Figures 6 and 7 respectively explain the connection between the connecting rod and the conductive plate. Figure 8.9 is a front view and side view of the furnace frame, respectively, Figure 10.11 is a cross-sectional view taken along the line X--X of Figure 8, and Figure 8. Figures 12 and 13 are a front view and a cross-sectional side view of the pressing plate, respectively.
The figures are a front view of the main part and a cross-sectional plan view of the main part, respectively, for explaining the connection state between the connecting rod and the conductive plate, and Fig. 16(a).
(b) is an enlarged cross-sectional view of a main part of a pressing plate, and FIG. 17 is a cross-sectional side view of a main part of a conventional electroosmotic dewatering device. I...'/3 provisional, 2...furnace frame, 2a...hole, 3.
... Press filter plate, 4.5 - Conductive plate, 6... Y cloth, 7.
...Filter chamber, 8...Guide rail, 9...Handle, IO
... Movable plate, 11... Drive device, 12... Main plate,
13. +9.25,28. ...Bolt, 14.26
... Connection ring, 15 ・Through hole for stock solution supply, 16.24
... Through hole, 17... Conductive plate support plate, 18... Elastic membrane, 20... Bottle, 2I... Through hole for compressed air supply, 22... Through hole for f liquid recovery, 27 ··Shielded wire. Patent Applicant Shinko Faudler Co., Ltd. (1 agent) Patent Attorney Aoyama and 2 others Figure 1 Figure 162 (a) C Figure 16 (b)' Mr. Shijishik I'7c Figure 17

Claims (1)

[Claims] (1) A filter chamber (7) surrounded by filter cloth (6, 6) is formed between adjacent filter plates (1, 3), and a first conductive plate (5) is provided on one filter plate (3). On the other hand, the other filter plate (1) is provided with a second conductive plate (4), and the first conductive plate (
5) and the second conductive plate (4), respectively, and apply a DC voltage to the stock solution in the filtration chamber (7) to perform electroosmotic dehydration on the stock solution. In the apparatus, one filter plate (3) is provided with an elastic membrane (18) on the surface of the filter plate main body (3a) facing the other filter plate (1), and the elastic membrane (18) is expanded. The elastic membrane (18
) and the filter plate main body (3a), the filter plate main body (3a) is provided with a fluid supply passage (24, 21) for supplying fluid between the filter plate main body (3a), and the first conductive plate ( 5) is fixed, and the first conductive plate (5) is moved toward the second conductive plate by elastic expansion of the elastic membrane (18).