JP4460391B2 - Filter cloth structure for sludge cake removal of squeeze type filter press - Google Patents

Description

  The present invention relates to a filter cloth structure for removing sludge cake of a squeeze filter press that dehydrates slurry (sludge cake) discharged from a wastewater treatment device or industrial wastewater treatment device containing factory waste liquid, etc. The present invention relates to a filter cloth structure for removing a sludge cake of a squeeze filter press that quickly and reliably peels a sludge cake from a filter cloth.

  Conventionally, a compression filter press removes a cake (sludge cake) in a filter chamber that is fixed between adjacent filter plates after the filtration and pressing process, so that the filter plates are separated by a predetermined distance one by one. The cake in the filter chamber dropped by its own weight simultaneously with the opening of the plate, and the cake adhering to the filter cloth was removed by the filter cloth vibration device.

  A filter cloth hanging rod is attached to the upper end of the filter cloth covering both filter surfaces of each filter plate of the above-mentioned squeezing filter press, and the left and right ends of the filter cloth hanging rod are shorter than the opening plate distance. It is connected by a connecting member such as a chain.At the time of opening the plate, the upper end of the opposing filter cloth is drawn inward and inclined in a lateral C shape, and the filter cloth hanging rod is The cake was shaken off and removed by a hammer.

Furthermore, as a method for increasing the dropping efficiency of the cake, in addition to the method of hitting the upper edge of the counter filter cloth with a vibration hammer, a method of directly applying vibration to the back surface of the filter cloth by the main and auxiliary filter cloth hitting members has been proposed. (For example, refer to Patent Document 1).
JP-A-6-269612

  However, in the above-described method of hitting the upper edge portion of the opposing filter cloth with a hammer, the vibration of the filter cloth is relatively slow, and the cake does not fall sufficiently. In addition, the method of directly vibrating the back surface of the filter cloth can drop the cake, but it requires modification of the device, complicates the structure, and increases the cost of modification.

  Due to the above-mentioned problems, it is possible to improve the efficiency of the filtering operation of the squeeze type filter press by reliably peeling and dropping the sticky cake from the filter cloth after the filtering operation with simple and inexpensive equipment. A method was required.

The present invention solves the above-described problem, and a plurality of filter plates each having a filter cloth coated on a filtration surface are arranged in parallel and separable, and a half of the filter plates is a compression filter plate. In the filter cloth structure for sludge cake removal of a filter filter press, a press filter plate and a non-squeeze filter plate are arranged to face each other, and a filter cloth that covers the filter surface of the press filter plate facing the non-squeeze filter plate One end of a strip-like or strip-like release material is fixed , and the other end of the release material is incorporated into a sludge cake attached to a filter cloth covering the filtration surface of the non-squeeze filter plate facing the press filter plate. It is the filter cloth structure for sludge cake removal of the squeeze type filter press characterized by these.

  The filter cloth structure for removing sludge cake of a squeeze type filter press is characterized in that the number of fixings of the strip-like or strip-like release material is 1 to 5 per filter cloth.

In the compression filter press, the cake is dehydrated by injecting air or water into the squeezed rubber plate on the side of the squeeze filter plate as a squeezing step after filtration. When the release material is fixed, the cake is dehydrated in a state where a band-like or string-like structure is incorporated in the cake.
Next, in order to peel the cake from the filter cloth, the filter plate is opened. At that time, the sludge cake is attached to the filter plate side (the side not the press filter plate) and added to the press filter plate side. Since the strip or strip-shaped release material is incorporated in the cake, when the filter plate is opened, the cake is pulled to the squeeze filter plate side by the driving force of the open plate, and the cake peeling from the filter cloth is quickly and reliably performed. Can be done.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 8 is an overall view of the squeeze type filter press, and the filter press is arranged so that it can be moved via a roller to a first head 12 and a rear head 13 having a stand 11 and a pair of left and right side bars 7 communicating between both heads. A large number of filter plates 5 and squeezed filter plates 4 that can be slid on the loose head 14 and both side bars 7 through a pair of suspenders 15 and held in a suspended state, and guide rails 17 of the side bars 7 Further, a portal-type moving body 16 that can move back and forth via a roller and a filter plate moving device drive unit 8 provided on the side bar 7 are provided.
The filter cloth between the filter plate 5 containing the cake and the compressed filter plate 4 is lifted by the filter cloth suspension device 6 into a lateral C-shape by the portal-shaped moving body 16 and then filtered by the filter cloth vibration device 9. The cake 3 is peeled off from the filter cloth 1 (FIGS. 3 and 4).

(Conventional example) (Figs. 1 and 2, no string-like release material attached)
When the stock solution is injected into the inlet 10 of the compression filter press of FIG. 8, the cake 3 is generated by being filtered and squeezed between the filter plate 5 and the press filter plate 4 as shown in FIG. 1.
The front and rear filtration surfaces of the filter plate 5 and the compressed filter plate 4 of FIGS.
FIG. 1 is a cross-sectional view of the cake state at the end of the pressing process (at the time of closing the plate) using the conventional sludge cake removing filter cloth structure, and the strip-like release material is not fixed to the pressing filter plate side.
When the above-mentioned squeezed filter plate and filter plate are opened, as shown in FIG. 2, a part of the cake attached to the filter cloth is pulled and dropped by the driving force at the time of opening, but the portion having a large adhesive force is filtered. It remained without peeling from the cloth.

[Example 1] (FIGS. 3 to 5, string-like release material attached: one place)
FIG. 3 is a cross-sectional view showing the cake state at the end of the squeezing process (at the time of closing the plate) of the filter cloth structure for removing sludge cake, to which the string-like release material 2 is attached according to the embodiment of the present invention, and FIG. It is a front view which shows the attachment position of the strip-shaped peeling material. One end of the strip-like release material 2 is fixed to one place on the upper side of the stock solution inlet 18 on the side of the compression filter plate.
When the above filter plate and the filter plate are opened, as shown in FIG. 4, by the driving force at the time of opening, the cake of the cake that has been attached to the filter plate by being pulled by the string-like release material fixed to the filter plate Most dropped and could be removed.

[Example 2] (FIGS. 3, 4, and 6, attaching a strip-like release material: two places)
The front view of the attachment position of the strip | belt-shaped peeling material 2 by other Example of this invention is shown in FIG. Example 2 is the same as Example 1 except that two strip-like release materials 2 are fixed to both sides of the stock solution inlet 18 on the side of the pressure filter plate.
When the squeezed filter plate and the filter plate are opened, as in Example 1, most of the cake that was pulled by the string-like release material 2 adhered to the squeezed filter plate and adhered to the squeezed filter plate by the driving force at the time of opening the plate. However, it dropped and was able to be removed.

[Example 3] (FIGS. 3, 4, and 7, string-like release material attachment: 3 locations)
The front view of the attachment position of the strip | belt-shaped peeling material 2 by other Example of this invention is shown in FIG. Example 3 is the same as Example 1 except that three strip-like release materials 2 are adhered to the upper side and both sides of the stock solution inlet 18 on the side of the compression filter plate.
When the squeezed filter plate and the filter plate are opened, as in Example 1, almost all of the cake attached to the squeezed filter plate by the driving force at the time of opening the plate is pulled by the string-like release material 2 fixed to the squeezed filter plate. Was dropped and removed.

[Examples 4 and 5] (FIGS. 3 and 4, string-like release material attachment: 5 and 7 locations)
The places where the string-like release material 2 is fixed around the undiluted solution inlet 18 on the side of the pressure filter plate are 5 places (Example 4) and 7 places (Example 5), and other conditions are the same as in Example 1. The removal state of the cake was confirmed.

For Examples 1 to 5 using the above strip-like release material, and conventional examples not using this, the number of remaining filter plates / the total number of filter plates, and the remaining cake area [%] on the cake remaining filter plate are as follows. investigated.
The results are shown in Table 1.

As is apparent from Table 1 above, Examples 1 to 5 with the string-like release material 2 attached had a reduced number of cake plates on which the cake remained, compared to the conventional example in which this was not attached. It can be seen that the remaining area of the cake is suppressed even in the case of the filter plate in which is left.
Moreover, when compared with the number of sticking of the strip-like release material 2, the larger the number of sticking, the more the cake is pulled toward the squeezed filter plate when the filter plate is opened, and the cake is peeled off from the filter plate quickly and reliably. It can be seen that it has been removed.
However, the effect of removing the cake does not change even when the number of fixings is set to seven. Therefore, it is preferable to set the number to 1 to 5 in consideration of the man-hours and member costs.
Further, in the above embodiment, the shape of the release material is a string shape, but it may be a band shape, and any shape is acceptable.

It is sectional drawing which shows the cake state at the time of completion | finish of the pressing process (at the time of a closed board) of the filter cloth structure for sludge cake removal by a prior art example. It is a figure which shows the state by which the cake adhering to a pressing filter board falls and is removed at the time of opening of the filter cloth structure for sludge cake removal of FIG. It is sectional drawing which shows the cake state at the time of completion | finish of the pressing process (at the time of a closed board) of the filter cloth structure for sludge cake removal by the Example of this invention. When the sludge cake removal filter cloth structure shown in FIG. 3 is opened, most of the cake attached to the squeeze filter plate is pulled by the string-like release material adhered to the squeeze filter plate and dropped and removed. FIG. It is a front view which shows the attachment position (one place) of the string-like peeling material of the filter cloth structure for sludge cake removal by the said Example of this invention. It is a front view which shows the attachment position (two places) of the string-like peeling material of the filter cloth structure for sludge cake removal by the other Example of this invention. It is a front view which shows the attachment position (3 places) of the string-like peeling material of the filter cloth structure for sludge cake removal by the other Example of this invention. It is a side view which shows the whole filter press.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filter cloth 2 String-like peeling material 3 Sludge cake 4 Squeeze filter board 5 Filter board 6 Filter cloth hanging device 7 Side bar
8 Filter plate moving device drive unit 9 Filter cloth vibration device 10 Stock solution injection port 11 Stand 12 First head 13 Rear head 14 Loose head 15 Lifter 16 Gate-shaped moving body 17 Guide rail 18 Stock solution injection port 19 Filtrate discharge port

Claims (2)

In the filter cloth structure for removing sludge cake of a squeeze type filter press, in which a plurality of filter plates whose filter cloths are coated on the filter surface are arranged in parallel and separable, and half of the filter plates are squeeze filter plates ,
The compressed filter plate and the non-pressed filter plate are arranged to face each other,
One end of a strip-like or strip-like release material is fixed to a filter cloth covering the filtration surface of the compression filter plate facing the non-squeeze filter plate, and the other end of the release material faces the non-squeeze filter plate. A filter cloth structure for removing a sludge cake of a squeeze type filter press, which is incorporated in a sludge cake attached to a filter cloth covering a filtration surface of a compression filter plate .   A filter cloth structure for removing sludge cake of a squeeze type filter press, wherein the number of fixings of the strip-like or strip-like release material according to claim 1 is 1 to 5 per filter cloth.

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