JPS6068018A - Sludge mixture feeding system of electroosmotic dehydrator - Google Patents

Abstract

PURPOSE:To prevent leakage of electric current accompanying feeding of sludge by enabling divided and intermittent charge of sludge to a hopper by providing a divisional feeding mechanism of sludge to the inlet side of a sludge feeding hopper. CONSTITUTION:Sludge 14 transported by a conveyor 8 is fed to a section 1 partitioned by a partition wall 17 made of an insulating material in a rotary drum of a divisional feeding mechanism 16. When a fixed amt. of the sludge is stored, the conveyor 8 is stopped. Dehydration of the sludge is proceeded in the main body side of the dehydrator between a rotary drum 1 serving also as an anode member and a filter belt 4. When the level of the sludge in the hopper 7 is fallen to below a specified level H, a drum in the divisional feeding mechanism 16 is turned by 90 deg. by a motor 19, and stored sludge is fed to the hopper 7. The sludge is fed simultaneously from the conveyor 8 to the next section of the divisional feeding mechanism 16. Since the feed of the sludge which is a conductive medium is performed intermittently, electric connection between the main body of the dehydrator and the conveyor 8 is shielded, and generation of leakage current is prevented.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a slurry supply means for an electroosmotic dewatering machine that dehydrates slurry such as sludge generated in a sewage treatment plant to form a cake.

[Prior art and related points]

2. Description of the Related Art As an electroosmotic dehydrator that continuously dehydrates slurry by applying electroosmosis, an electroosmotic dehydrator having a configuration as shown in FIG. 1 or 2 is known. In FIG. 1, 1 is a metal rotating drum that also serves as an electrode member on the anode side, and 2 is the drum l.
4 is a metal press belt that also serves as a cathode side electrode member stretched across the sprocket 3 facing the circumferential surface of the press belt 2; 4 is a filter belt for filtrate permeation stretched over the press belt 2; 5 is a filter belt stretched over the sprocket 3; It is a belt drive motor, and a slurry conveyance road 6 is defined in the area facing the drum 1 and the filter belt 4, and a slurry supply hopper 7 is installed roughly on the entrance side of the slurry conveyance passage 4. It makes up the main body of the Nariki machine. A belt-type conveyor 8 as a slurry supply means is installed on the inlet side of the hopper 7, with the press belt 2 serving as the cathode electrode as the ground side and the electrode drum 1 on the other electrode side. A DC power supply device 9 is connected to. Note that IO is a filtered water receiving net that communicates with the outside of the system, 11 is a dehydrated cake collection container, and 12 is a drive motor for the conveyor 8. In the example shown in FIG. 1, the anode side electrode member is configured as a co-rotating drum I, while in the example shown in FIG.
The filter belt 4 is disposed substantially parallel to and opposite to the filter belt 4 which is stretched along the cathode side electrode member 13 which is fixedly disposed opposite to the filter belt 4 . The rest of the structure is almost the same as that in FIG. In each of the configurations shown in FIGS. 1 and 2, the slurry 14 as a material to be dehydrated is fed from the slurry supply conveyor 8 through the hopper 7 to the slurry conveying passage 6, while the drive motor 5 is operated, If the slurry 14 is sandwiched in a sandwich-like manner in the conveyance passage and conveyed toward the exit in the direction of arrow P, and power is supplied from the power supply device 9, the slurry 14 is subjected to mechanical squeezing force as well as a force applied to the opposite electrode 1m. The formed electric field acts, and the water contained in the slurry becomes positively charged and flows toward the cathode.
So-called electroosmotic dehydration, in which water is discharged to this electrode member and dehydrated by passing through the filter belt 4, is performed. Note that the filtrate that has passed through the filter belt 4 drips into the filtrate receiving tray 10, from which it is drained out of the system. On the other hand, the dehydrated slurry is caked, and the dehydrated cake 14'
It is sent out from the exit of passage 6, and the chute】5
It is then collected into a collection container 11. In this way, slurry such as sludge with a high water content is continuously dehydrated to become a dehydrated cake with a water content of 50% or less, for example. This dehydrated cake is incinerated or composted and reused as fertilizer. By the way, as shown in FIG. 1 or FIG. 2, the cathode side electrode member is grounded in consideration of worker safety, and the power supply device 9 is connected between it and the anode side electrode member to apply voltage. In such a device, since the conveyor 8 serving as the slurry supply means is also grounded, it has the same ground potential as the cathode side. On the other hand, high moisture content mud! 14 is electrically conductive, so while the slurry is continuously supplied from the conveyor 8 to the hopper 7 as shown in the figure, power is supplied from the power supply value W19 and the drive motor 5
When electroosmotic dehydration is performed by driving the slurry conveying means, an electric ill is generated between the anode side of the power supply device 9 and the slurry supply conveyor 8 at ground potential, using the slurry 14 flowing from the conveyor 8 into the hopper 7 as a conductive medium. A flow path is formed,
Some of the currents are electric whales! Leakage from the device towards Conhair 8. Furthermore, this leakage current has no effect on the electroosmotic water mechanism and not only causes power loss, but also causes electric shock accidents for workers.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a slurry supply system for an electroosmotic dehydrator that skillfully solves the problem of current leakage associated with the supply of a complete slurry.

[Key points of the invention]

In order to achieve the above object, the present invention includes a slurry division supply mechanism on the inlet side of a slurry supply hopper when supplying slurry, and the division supply mechanism divides the slurry fed from the outside into small portions. By intermittently supplying the conductive medium slurry, communication between the mature tree body side during electroosmotic dewatering operation and the slurry supply conveyor serving as the slurry supply means is cut off. Prevents electric current from leaking to the outside through the slurry, resulting in power loss. This is designed to prevent electrical leakage accidents on the first floor.

[Embodiments of the invention]

3 II ta>, (bl, Fig. 4 (al, (
1 and 5 show different embodiments of the present invention, and first, in FIG. 3 (b), the slurry supply hopper 7 and A dividing supply mechanism 16 is installed between the slurry supply conveyor 8 and the slurry 14 to relay the slurry 14 between the conveyor and the hopper. It functions as a partitioned rotating drum, and is connected to a drive motor 19 and rotated intermittently by 90 degrees in the direction of the arrow from the illustrated position.On the other hand, the hopper 7 is equipped with a level detector that detects the level of accumulated slurry in the hopper. 20 is provided, and the operation of the drive motor I9 is controlled based on the output signal of the level detector 20.Next, the slurry supply operation with the above configuration will be described.That is, the slurry 14 carried by the conveyor 8 is The divided feeder [16 is fed from above into one compartment partitioned into the rotating drum, and when a certain amount corresponding to the volume of this compartment is supplied, the conveyor 8 stops for a moment, (,, waits in this state. - When the dewatering process in the dehydrator main body side progresses and the slurry level in the hopper drops below a predetermined level H,
The drive motor 19 is started by the output signal of the level detector 19, and rotates the drum of the divided supply mechanism 16 by 90 degrees F5J. From this, the slurry stored in the drum of the split supply mechanism is thrown into the hopper 7. At the same time, slurry is newly supplied from the conveyor 8 to the next section toward the drum. In this case, the slurry supplied from the conveyor 8 to the drum and the slurry charged from the drum to the hopper are separated by an insulating partition wall 17, and therefore the dehydrator main body and the slurry supply conveyor are separated. There will be no electrical connection between the parts through the conductive medium, sludge, and the leakage current flowing from the dehydrator main body to the conveyor will be reliably prevented. By repeating this operation, the slurry 4 is divided into small portions and intermittently fed into the hopper 7. FIG. 4(a), fbl, is an embodiment that is slightly modified from the previous embodiment, in which the divided feeding mechanism 16 installed on the top surface of the hopper 7 is made of an electrically insulating material. - Consisting of a case 21 with an inlet and an outlet opening in the direction, and a cross-shaped paddle-type partition plate 22 housed in the center of the case 21 with its tip in close contact with the inner wall surface of the case 21; 22 is connected to the drive motor 19. With this configuration, the slurry 14 supplied from the conveyor 8 to the divisional supply mechanism 16 is divided into small portions each partitioned by the partition plate 22 as the partition plate 22 rotates, and then sent to the hopper 7 to be sent to the hopper 7. It will be put into use. In this case, inside the case 21, the slurry flowing from the conveyor 8 and the slurry flowing out toward the hopper 7 are separated and separated by an electrically insulating partition plate 22, and as in the previous embodiment, the slurry flowing through the slurry @14 is separated. conveyor 8 from the dehydrator main body side.
This prevents current from leaking towards. As in the previous embodiment, the drive motor 19 is controlled so as to start supplying slurry when the level of slurry staying in the hopper falls below a predetermined level. FIG. 5 shows an actual A11i example different in history, in which a packet type conveyor having partitions 24 arranged at regular intervals along the outer periphery of the heald 23 is used as the divided feeding mechanism 16 to connect the hopper 7 and the slurry feeding conveyor. It is installed in conjunction with 8. Note that 25 is a hopper for supplying slurry to the packet type conveyor. With this configuration, the slurry 14 supplied from the conveyor 8 to the hopper 25 is divided into small portions by the operation of the drive motor 9 and transported by a packet type conveyor, and is intermittently transported from the end of this conveyor toward the hopper 7. Fukishita will be added. As a result, as in each of the embodiments described above, when supplying slurry, the slurry n staying in the input robot soba 7 of the dehydrator main body and the slurry supplied from the slurry supply conveyor 8 are electrically connected to each other. is gone,
Can prevent leakage current from occurring. It should be noted that each of the embodiments described above shows some examples for implementing the system of the present invention, and the system can also be implemented using an appropriate divisional supply means other than the embodiments.

【Effect of the invention】

As described below, according to the present invention, the main body of the dehydrator is
J (Ill is equipped with a slurry division supply mechanism, and the slurry fed from the outside is divided into small quantities by the division supply mechanism described in (i) and 2. By doing so, it is possible to prevent electric current from leaking to the outside through the supply slurry during electroosmotic mature operation, thereby preventing power loss and electric leakage accidents.
In addition, excellent effects can be achieved in terms of safety measures.

[Brief explanation of drawings]

Figures 1 and 2 are the configuration diagrams of the Minaru type electric TJL permeable water dewatering machine using the conventional slurry supply method, respectively.
Figures (a), 4 (al) and 5 are block diagrams of the slurry division supply mechanism of different embodiments of the present invention, Figures 3 (h) and 4 (bl are Figures 4 (a) and 4 (a), respectively. ). Fig. 4 is a perspective view of the configuration of 1b). 1.1° - Rotating drum and press belt that also serves as an anode member, 2 - Press belt that also serves as a cathode member, 4 -
Filter belt, 5- Drive motor of mud transport mechanism, 8-
Sludge supply conveyor, 9-power supply device, I3-# pole member,
14--Exile, 16--Divided supply mechanism. Procedural supplementary statement (method) February 15, 1975 Patent Office------Chief------Government -Ko Kazuyuki'' pull j (-dono de 4 (1, Indication of tenancy Patent application Sho, j -J-/7 Quo 8
Number of inventions to be increased by the 6th amendment
BJICa)J and "Fig. 4 (bl)" on the 16th line of the same page are corrected to "Fig. 4 (a)".

Claims (1)

[Claims] 1) Applying a voltage between the anode and cathode side electrode members, which are arranged opposite to each other across the slurry transport passage, and applying an electric field to the Y slurry transport passage, externally passes through the slurry supply hopper to the entrance side of the slurry transport passage. This is a slurry supply system for an electroosmotic dehydrator that performs electroosmotic dewatering of the slurry during the conveyance process by conveying the slurry fed in toward the outlet. A slurry supply system for an electroosmotic dewatering machine, characterized in that the slurry fed from the outside during slurry supply is divided into small portions by the dividing supply mechanism and intermittently fed into the hopper. .