Turbid water treatment system using a filter press device

Abstract

Effectively removes residual water and solid matter from the filter press device. [Solution] After the first operation, the turbid water treatment system 100 performs a second operation in which the filter plate section 8 and the contact section 9 are separated by a switching device to remove the cake from the filter chamber. Furthermore, at a time different from the first and second operations, the switching device is used to create a contact state, and while the switching section 81 (one switching section) and the switching section 83 (the other switching section) are in a shut-off state, air is injected into the filter chamber by the second injection device 70, and a third operation is performed to maintain a compressed state in which the air is compressed within the filter chamber. While the compressed state is maintained by the third operation, the second switching section is switched to an unlocked state, and a fourth operation is performed to discharge air from the filter chamber through the discharge passage 122.

Description

Technical Field

[0001] The present disclosure relates to a turbid water treatment system using a filter press device.

Background Art

[0002] In a conventionally provided filter press device, a plurality of filter plates are stacked and arranged, muddy water is poured into a space formed between the filter plates, and the muddy water is squeezed between the filter plates to separate solid components from liquid components. As an example of a filter plate used in this type of filter press device, a technique such as that disclosed in Patent Document 1 has been proposed. The filter plate disclosed in Patent Document 1 has frame-shaped protrusions provided on both front and rear surfaces at the central portion of a substrate. In a state where a plurality of filter plates overlap, recesses on the central sides of adjacent filter plates face each other to form a filter chamber, and the frame-shaped protrusions of adjacent filter plates press against each other to seal the peripheral portion of the filter chamber.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, a filter press device operates to dehydrate a solid-liquid mixture supplied to a filter chamber to generate a cake in the filter chamber and discharge the dehydrated cake. This type of filter press device has a problem that water and solids tend to remain in the filter chamber after discharging the dehydrated cake.

[0005] The present disclosure provides a technique capable of effectively discharging remaining water and solids from a filter press device in order to solve at least one of the above-described problems.

Means for Solving the Problems

[0006] ​ One of the disclosures is a turbid water treatment system using a filter press device. teeth, filter plate section, A portion is positioned opposite the filter plate portion, and its relative position to the filter plate portion switches between a close-contact position where it is in close contact with the filter plate portion and an open position away from the filter plate portion, and when in the close-contact position, the close-contact portion and the filter chamber together with the filter plate portion, A switching device that switches between a state in which the filter plate portion and the contact portion are in close contact and a state in which the filter plate portion and the contact portion are separated, A first injection device that injects a solid-liquid mixture into the filter chamber via a first supply channel, A second injection device for injecting air into the filter chamber, A discharge passage leading to the filter chamber, A switching unit that switches the first supply path between an interrupted state and an uninterrupted state, The aforementioned discharge passage is switched between a blocked state and an unlocked state, Equipped with, A first operation in which the solid-liquid mixture is injected into the filter chamber by the first injection device when the aforementioned tight-fitting state is achieved, After the first operation, a second operation is performed in which the filter plate portion and the contact portion are separated by the switching device to remove the cake from the filter chamber, A third operation is performed in which, when the contact state occurs at a time different from the first operation, air is injected into the filter chamber by the second injection device while maintaining the first switching unit and the other switching unit in a shut-off state, and the compressed state in which the air is compressed within the filter chamber is maintained. A fourth operation in which, when the compression state is reached, the other switching unit is switched to the unblocked state, and air is discharged from the filter chamber through the discharge passage, To do so. [Effects of the Invention]

[0007] The technology disclosed herein can effectively discharge residual water and solid matter from a filter press device. [Brief explanation of the drawing]

[0008] [Figure 1] It is a cross-sectional view schematically illustrating the filter plate structure of a filter press device according to the first embodiment of the present invention. [Figure 2] It is an explanatory view illustrating a state in which a solid-liquid mixture flows in with one filter plate and another filter plate in close contact in the filter plate structure of FIG. 1. [Figure 3] It is a front view of one filter plate of the filter plate structure of FIG. 1. [Figure 4] It is a front view illustrating a state in which the filter cloth is omitted from the filter plate of FIG. 3. [Figure 5] It is a rear view of the filter plate of FIG. 3. [Figure 6] It is a rear view illustrating a state in which the filter cloth is omitted from the filter plate of FIG. 5. [Figure 7] It is an enlarged view showing a part of the filter plate structure of FIG. 1 enlarged. [Figure 8] It is an enlarged view conceptually showing a part of the filter plate structure in the state of FIG. 2 enlarged. [Figure 9] It is a side view conceptually showing a filter press device having the filter plate structure of FIG. 1. [Figure 10] It is an explanatory view showing an example in which the configuration of FIG. 2 is embodied. [Figure 11] It is an explanatory view showing an example in which the configuration of FIG. 3 is embodied. [Figure 12] It is an explanatory view showing an example in which the configuration of FIG. 4 is embodied. [Figure 13] It is an explanatory view showing an example in which the configuration of FIG. 5 is embodied. [Figure 14] It is an explanatory view showing an example in which the configuration of FIG. 6 is embodied. [Figure 15] It is an explanatory view showing an example in which a part of the filter press device of FIG. 9 is embodied. [Figure 16] It is an explanatory view conceptually illustrating the configuration of a part of the filter press device of FIG. 15 as seen from above. [Figure 17] It is an explanatory view conceptually illustrating the configuration of a part of the filter press device of FIG. 15 as seen from the front. [Figure 18](A) is an explanatory diagram illustrating an example in which a cake falls while tilting when there is no regulating part, and (B) is an explanatory diagram illustrating an example in which a cake falls while tilting when there is a regulating part. [Figure 19] (A) is an explanatory diagram exemplifying a state of one set of adjacent filter plates viewed from above in the first holding state, and (B) is an explanatory diagram exemplifying a state in which the filter plate set is separated to drop the cake. [Figure 20] It is an explanatory diagram exemplifying a turbid water treatment system according to the first embodiment.

Embodiments for Carrying Out the Invention

[0009] [1] A filter plate part, An adhering part that is arranged opposite to the filter plate part, and the relative position with respect to the filter plate part is switched between an adhering position where it adheres to the filter plate part and an open position where it is separated from the filter plate part, and forms a filtration chamber together with the filter plate part in the adhering position, A switching device that switches between an adhering state in which the filter plate part and the adhering part are adhered and a separated state in which the filter plate part and the adhering part are separated, A first injection device that injects a solid-liquid mixture into the filtration chamber through a first supply path, A second injection device that injects air into the filtration chamber, A discharge path leading to the filtration chamber, One switching part that switches the first supply path between a blocked state and an unblocked state, Another switching part that switches the discharge path between a blocked state and an unblocked state, Comprising, A first operation of injecting the solid-liquid mixture into the filtration chamber by the first injection device in the adhering state, After the first operation, a second operation of separating the filter plate part and the adhering part by the switching device to detach the cake from the filtration chamber, In the adhering state at a time different from the first operation, while maintaining the one switching part and the other switching part in a blocked state, injecting air into the filtration chamber by the second injection device to maintain a compressed state in which air is compressed in the filtration chamber. A fourth operation in which, when the compression state is reached, the other switching unit is switched to the unblocked state, and air is discharged from the filter chamber through the discharge passage, A turbid water treatment system using a filter press device.

[0010] The filter press device described in [1] above can effectively discharge any remaining water or solid matter from the filter press device.

[0011] <First Embodiment> The following describes a first embodiment of the filter plate structure and filter press apparatus according to the present invention, based on the drawings. These drawings are used to illustrate the technical features that the present invention may adopt. Unless otherwise specified, the structures of the apparatus described below are not intended to be the sole limiting factors, but are merely illustrative examples.

[0012] (Filter press device) First, let me explain the overview of the filter press apparatus 1. The filter plate structure 3 shown in Figure 1 is used, for example, in a single-type filter press device 1 as shown in Figure 9. The filter press device 1 shown in Figure 9 is a device that can dewater a solid-liquid mixture (for example, a slurry in which sludge, excavated soil, cement, etc. are mixed in water) and discharge a solidified object (cake) from the residue remaining after dewatering the solid-liquid mixture.

[0013] The filter press device 1 uses a filter plate structure 3 as shown in Figure 1, etc. This filter plate structure 3 is configured with filter plates 10 arranged in series, and each filter plate 10 has a plate-shaped base plate 11 with a perforated hole 16 formed in the center, over which a filter cloth 18 is stretched. The filter press device 1 shown in Figure 9 has an approach / separation device (detailed illustration omitted in Figure 9) that can move the multiple filter plates 10 constituting the filter plate structure 3 closer together and further apart from each other. When supplying a solid-liquid mixture, the adjacent filter plates 10 are stacked in close contact with each other (see Figures 2 and 8), and the solid-liquid mixture (for example, a slurry such as muddy water) is pressurized and injected into the perforated holes 16 of each filter plate 10 by a pump. The injected solid-liquid mixture accumulates in the filter chamber 40 shown in Figures 2 and 8, etc., under high internal pressure, and moisture is discharged through the minute gaps in the filter cloth 18. Then, between adjacent filter plates 10 (specifically, between the filter cloths 18 on adjacent filter plates 10), a solid substance (dewatered cake) is formed from the residue remaining after a large amount of water has been removed from the solid-liquid mixture supplied from the pump. In Figures 1 and 2, the details of the water flow path (details of the drainage channel 28) through the mesh of the filter cloth 18 into the interior of the filter plates 10 are omitted, but in reality, the water that flows into the interior of the filter plates 10 through the mesh of the filter cloth 18 is discharged to the outside (bottom) of the filter plates 10 through the drainage channel 28 inside the filter plates 10.

[0014] (Filter plate structure) Next, filter plate structure 3 will be described in detail. As shown in Figure 1, the filter plate structure 3 is composed of multiple filter plates 10. Each filter plate 10 has the same structure.

[0015] In the following description, a predetermined number of filter plates 10 arranged alternately will be referred to as filter plate sections 8, and a number of filter plates 10 arranged alternately between these filter plate sections 8 will be referred to as contact sections 9. In the filter plate structure 3, all filter plate sections 8 and all contact sections 9 have the same structure. Each contact section 9 is positioned opposite a filter plate section 8 and is configured to switch between a contacted position where it is in close contact with the filter plate section 8 and an open position where it is displaced from the filter plate section 8, and has an internal containment space. In the filter plate structure 3, when the contact section 9 is in the contacted position, a filter chamber is formed by the filter plate section 8 and the contact section 9.

[0016] Here, we will describe one of the components of the filter plate section 8 and the contact section 9 (the component of the filter plate 10). The filter plate 10 is a plate-shaped component that becomes either the filter plate section 8 or the contact section 9, and is mainly composed of a substrate section 11 and a filter cloth 18.

[0017] The substrate portion 11 has a plate-like shape overall and includes two central recesses 12 provided on both sides in the thickness direction, two pressing portions 14 provided on both sides in the thickness direction, and a hole portion 16.

[0018] The two central recesses 12 are both recesses in the thickness direction of the substrate portion 11, located in the center away from the periphery of the substrate portion 11. In Figure 1, etc., of the two central recesses 12 formed on each filter plate 10, the recess on one side (the side on which the annular protrusion 24 is formed) is referred to as one central recess 12A (or simply central recess 12A), and the recess on the other side (the side on which the annular recess 34 is formed) is referred to as the other central recess 12B (or simply central recess 12B). As shown in Figure 4, one central recess 12A has a rectangular outer diameter when viewed from the front, and as shown in Figure 6, the other central recess 12B has a rectangular outer diameter when viewed from the back.

[0019] In this configuration, one central recess 12A of the filter plate 10, which functions as the filter plate portion 8, functions as a recessed portion 8A, and the other central recess 12B of the filter plate 10, which functions as the filter plate portion 8, functions as a recessed portion 8B. The recessed portions 8A and 8B are formed on both outer surfaces (specifically, on both plate surfaces facing the two contact portions 9) of the substrate portion 11 that constitutes the filter plate portion 8, and constitute a part of the filter chamber 40, which will be described later. Furthermore, one central recess 12A of the filter plate 10, which functions as the contact portion 9, functions as a housing portion 9A, and the other central recess 12B of the filter plate 10, which functions as the contact portion 9, functions as a housing portion 9B. The housing portion 9A is configured in a concave shape, and when the contact portion 9 is in contact with the filter plate portion 8 on the side facing the housing portion 9A, it forms the filter chamber 40 together with the recessed portion 8B of the filter plate portion 8. The housing section 9B is configured in a concave shape, and when the contact section 9 is in close contact with the filter plate section 8 on the side opposite to the housing section 9B, it together with the recessed section 8A of the filter plate section 8 constitutes the filter chamber 40.

[0020] The pressing portion 14 is a part that is arranged in a ring shape surrounding the central recess 12. Of these, one pressing portion 14A of each filter plate 10 is a part that faces and presses against the other pressing portion 14B of the other filter plate 10. As shown in Figure 4, the pressing portion 14A on one side (the side on which the annular protrusion 24 is formed) is a rectangular frame when viewed from the front and is arranged in a square shape (specifically, a square shape) along the periphery of the filter plate 10. As shown in Figure 6, the pressing portion 14B on the other side (the side on which the annular recess 34 is formed) is a rectangular frame when viewed from the front and is arranged in a square shape (specifically, a square shape) along the periphery of the filter plate 10.

[0021] The pressing portion 14 provided on the filter plate 10, which functions as the filter plate portion 8, has one pressing portion 14A that functions as the first pressing portion 8C and the other pressing portion 14B that functions as the first pressing portion 8D. The first pressing portion 8C is positioned on the outer surface of one side in the thickness direction of the substrate portion 11 (the side of one contact portion 9) surrounding the recessed portion 8A, and when in contact, it functions to press the contact portion 9 opposite to the first pressing portion 8C. The first pressing portion 8D is positioned on the outer surface of one side in the thickness direction of the substrate portion 11 (the side of the other contact portion 9) surrounding the recessed portion 8B, and when in contact, it functions to press the contact portion 9 opposite to the first pressing portion 8D.

[0022] The pressing portion 14 provided on the filter plate 10, which functions as the contact portion 9, has one pressing portion 14A that functions as the second pressing portion 9C and the other pressing portion 14B that functions as the second pressing portion 9D. The second pressing portion 9C is positioned on the outer surface of one side in the thickness direction of the base portion 11 (the side of one filter plate portion 8) surrounding the housing portion 9A, and when in contact, it functions to press the first pressing portion 8D of the filter plate portion 8 that is opposite to the second pressing portion 9C. The second pressing portion 9D is positioned on the outer surface of one side in the thickness direction of the base portion 11 (the side of the other filter plate portion 8) surrounding the housing portion 9B, and when in contact, it functions to press the first pressing portion 8C of the filter plate portion 8 that is opposite to the second pressing portion 9D.

[0023] As shown in Figures 4 and 7, the pressing portion 14A on one side (the side on which the annular projection 24 is formed) has an opposing portion 22 arranged in an annular shape (specifically, in the shape of a square frame) around the central recess 12A, and an annular projection 24 arranged in an annular shape (specifically, in the shape of a square frame) around the central recess 12A and protruding from the surface of the opposing portion 22.

[0024] The annular projection 24 is made of an elastic material such as rubber or an elastomer other than rubber, and is fixed to the pressing part 14A by fitting into a groove formed in the opposing part 22 of the pressing part 14A (a groove formed to surround the central recess 12A). As shown in Figure 7, the annular projection 24 has a curved shape such that the outer shape of the cross section cut in a plane perpendicular to the direction in which the annular projection 24 extends is convex outwards. The annular projection 24 is also hollow, with a void 24A formed inside. The void 24A is formed outside the position of the opposing part 22 in the thickness direction of the filter plate 10 (farther away from the center in the thickness direction), and is configured to extend along the direction in which the annular projection 24 extends and to be arranged in a ring around the central recess 12.

[0025] As shown in Figures 6 and 7, the pressing portion 14B on the other side (the side on which the annular recess 34 is formed) has an opposing portion 32 arranged in an annular shape (specifically, in the shape of a rectangular frame) around the central recess 12B, and an annular recess 34 arranged in an annular shape (specifically, in the shape of a rectangular frame) around the central recess 12B and recessed from the surface of the opposing portion 32.

[0026] In this configuration, one opposing portion 22 of the filter plate 10, which functions as the filter plate portion 8, functions as the first opposing portion 8E, and the other opposing portion 32 of the filter plate 10, which functions as the filter plate portion 8, functions as the first opposing portion 8F. Each of the first opposing portions 8E and 8F is positioned around the recessed portions 8A and 8B, respectively, and when in contact, its surface faces the respective sides of the second pressing portions 9D and 9C. Similarly, one opposing portion 22 of the filter plate 10, which functions as the contact portion 9, functions as the second opposing portion 9E, and the other opposing portion 32 of the filter plate 10, which functions as the contact portion 9, functions as the second opposing portion 9F. Each of the second opposing portions 9E and 9F is positioned around the housing portions 9A and 9B, respectively, and when in contact, its surface faces the respective sides of the first pressing portions 8D and 8C.

[0027] As shown in Figure 1, in each filter plate 10, a hole 16 is formed so as to penetrate in the thickness direction between the central recess 12A on one side (the side on which the annular protrusion 24 is formed) and the central recess 12B on the other side (the side on which the annular recess 34 is formed). The hole 16 functions as a flow path that allows the solid-liquid mixture to flow in the thickness direction of the filter plate 10 so as to pass through the inside of the filter plate 10. The hole 16 of the filter plate 10, which functions as the filter plate portion 8, is configured to pass through the inside of the substrate portion 11 and becomes a flow path that leads to the recessed portions 8A and 8B. Similarly, the hole 16 of the filter plate 10, which functions as the contact portion 9, is configured to pass through the inside of the substrate portion 11 and becomes a flow path that leads to the housing portions 9A and 9B.

[0028] As shown in Figures 1 and 3, the filter cloth 18 is positioned to cover the area outside the hole 16 on one side in the thickness direction of the plate, and as shown in Figures 1 and 5, the filter cloth 18 is positioned to cover the area outside the hole 16 on the other side in the thickness direction of the plate. Note that in Figures 2 and 8, the two filter cloths 18 interposed between the opposing parts 22 and 32 and between the annular protrusion 24 and the annular recess 34 are omitted from the diagram. In Figures 1 to 8, the filter cloth 18 covering one side (the side on which the annular protrusion 24 is formed) is referred to as filter cloth 18A, and the filter cloth covering the other side (the side on which the annular recess 34 is formed) is referred to as filter cloth 18B.

[0029] As shown in Figure 3, the filter cloth 18A on one side (the side where the annular protrusion 24 is formed) is fixed to the annular plate portion 15A, which will be described later, and is distributed throughout the area outside the annular plate portion 15A, extending to the periphery of the substrate portion 11. As shown in Figure 5, the filter cloth 18B on the other side (the side where the annular recess 34 is formed) is fixed to the annular plate portion 15B, which will be described later, and is distributed throughout the area outside the annular plate portion 15B, extending to the periphery of the substrate portion 11. In Figures 1, 2, 7, and 8, the filter cloth 18 is conceptually shown by a dashed line, and in Figures 3 and 5, the filter cloth 18 is conceptually shown as a patterned area. In the examples of Figures 2 and 8, the filter cloth 18A and 18B also exist in the portion sandwiched between the pressing portions 14A and 14B, but the illustration (illustration by a dashed line) of the filter cloth 18A and 18B in this portion is omitted. In the example shown in Figure 1, the peripheral edges of the filter cloth 18A and the filter cloth 18B are connected in each filter plate 10, but the peripheral edges do not necessarily have to be connected. The filter cloth 18A only needs to be positioned to cover the inner surface of the central recess 12A in the area outside the hole 16, and the covering area of ​​the filter cloth 18A is not limited to the configurations shown in Figures 1 and 3.

[0030] In this configuration, the filter cloth 18 placed on the filter plate 10, which functions as a filter plate portion 8, is arranged to cover the inner surfaces of the recessed portions 8A and 8B and the surfaces of the first pressing portions 8C and 8D. One side of the filter cloth 18A is positioned across the recessed portion 8A and the first pressing portion 8C, while the other side of the filter cloth 18B is positioned across the recessed portion 8B and the first pressing portion 8D. The filter cloth 18 placed on the filter plate 10, which functions as a contact portion 9, is arranged to cover the inner surfaces of the housing portions 9A and 9B and the surfaces of the second pressing portions 9C and 9D. One side of the filter cloth 18A is positioned across the housing portion 9A and the second pressing portion 9C, while the other side of the filter cloth 18B is positioned across the housing portion 9B and the second pressing portion 9D.

[0031] In the above configuration, the annular protrusion 24 provided on the first pressing portion 8C functions as the first sealing portion 8G, is positioned around the recessed portion 8A, and protrudes from the surface of the first opposing portion 8E. The annular recess 34 provided on the first pressing portion 8D functions as the first sealing portion 8H, is positioned around the recessed portion 8B, and concaves from the surface of the first opposing portion 8F.

[0032] The annular projection 24 provided on the second pressing portion 9C functions as the second sealing portion 9G. The second sealing portion 9G is positioned around the housing portion 9A, protruding from the surface of the second opposing portion 9E, and pressing against the first sealing portion 8H when in close contact. The annular recess 34 provided on the second pressing portion 9D functions as the second sealing portion 9H. The second sealing portion 9H is positioned around the housing portion 9B, concave from the surface of the second opposing portion 9F, and pressing against the first sealing portion 8G when in close contact.

[0033] The filter plate structure 3 shown in Figure 1, etc., can be switched between a state in which adjacent filter plates 10 are spaced apart, as shown in Figures 1 and 7, and a state in which adjacent filter plates 10 are in close contact, as shown in Figures 2 and 8. The multiple filter plates 10 are aligned in the thickness direction as shown in Figure 1 by rails (not shown in Figure 1, etc.) (i.e., the thickness direction of each filter plate 10 is aligned in the same direction), and the position of the outer edge of each filter plate 10 (the position of the outer edge in a plane direction perpendicular to the thickness direction) is also aligned. By moving along the rails in this aligned state, adjacent filter plates 10 can move closer to and further apart from each other.

[0034] As shown in Figures 2 and 8, when multiple filter plates 10 are stacked so that one filter plate 10 is in close contact with another filter plate 10, the annular protrusion 24 of one filter plate 10 fits into the annular recess 34 of the other filter plate 10 and presses against the inner surface of the annular recess 34, creating a configuration in which the opposing portion 22 of one filter plate 10 and the opposing portion 32 of the other filter plate 10 press against each other. In the example of Figure 8, two filter cloths 18A and 18B that cover the two filter plates 10 are interposed between the opposing portion 22 of one filter plate 10 and the opposing portion 32 of the other filter plate 10, and in this state, the opposing portion 22 of one filter plate 10 and the opposing portion 32 of the other filter plate 10 press against each other. In other words, the opposing portion 22 of one filter plate 10 and the opposing portion 32 of the other filter plate 10 press against each other via the filter cloth 18A of one filter plate 10 and the filter cloth 18B of the other filter plate 10. Furthermore, two filter cloths 18A and 18B, each covering the two filter plates 10, are interposed between the annular protrusion 24 and the annular recess 34, and in this state (i.e., with the filter cloths 18A and 18B interposed between the outer surface of the annular protrusion 24 and the inner surface of the annular recess 34), the annular protrusion 24 and the annular recess 34 press against each other. That is, the annular protrusion 24 of one filter plate 10 presses against the inner surface of the annular recess 34 via the filter cloth 18A of one filter plate 10 and the filter cloth 18B of the other filter plate 10.

[0035] As shown in Figure 8, when the adjacent filter plates 10 are stacked in close contact, and the solid-liquid mixture is injected through the holes 16 using the first injection device 60 shown in Figure 15 (for example, a slurry supply device including a pump 110 as shown in Figure 20), the injected solid-liquid mixture accumulates in the filter chamber 40 shown in Figures 2 and 8 (see also Figure 15) under high internal pressure, and moisture is discharged to the substrate portion 11 side (i.e., the back side of the filter cloth 18) through the minute gaps in the filter cloth 18. Then, a dewatered cake is formed between the adjacent filter plates 10 (specifically, between the filter cloths of adjacent filter plates 10). The dewatered cake is an object from which a certain amount of moisture has been removed from the solid-liquid mixture 7 injected into the filter chamber 40, as shown in Figure 2.

[0036] In this configuration, each filter plate 10 is provided with a base plate portion 11. The base plate portion 11 is plate-shaped, and one of the two central recesses 12A and one of the two pressing portions 14A are formed on one side of the plate (the one side as described above), while the other central recess 12B and the other pressing portion 14B are formed on the other side of the plate (the other side as described above). A filter cloth 18A is provided so as to cover the inner wall of one central recess 12A, and a filter cloth 18B is provided so as to cover the inner wall of the other central recess 12B. On the back side of the filter cloth 18 in one central recess 12A and the other central recess 12B, drainage channels 28 (one drainage channel 28A and the other drainage channel 28B) leading to the outside of the filter plate 10 are provided.

[0037] In each of the central recesses 12A and 12B of the filter plate 10, a drain plate 13 (one drain plate 13A and the other drain plate 13B) is provided on the inner wall (inner surface) of the deepest part in the depth direction of each drain plate 13A and 13B, each equipped with a water passage that allows liquid to pass through in the direction of its plate thickness. The water passage of either drain plate 13A or 13B may be composed of numerous holes, or it may be composed of grooves or notches. The drain plates 13A and 13B are configured such that water can pass from the front side to the back side while supporting the filter cloth 18 on the front side, and may be configured such as having many through holes formed in a plate-like body, or they may be configured as a mesh. On the substrate portion 11, a plate-like body 11A is provided on the inside of each drain plate 13 in the thickness direction (thickness direction of the filter plate 10), with both sides in the thickness direction covered by each drain plate 13. As shown in Figures 1 and 4, one pressing portion 14A is a rectangular frame fixed along the periphery of the plate-like body 11A on one side of the plate-like body 11A. The other pressing portion 14B is a rectangular frame fixed along the periphery of the plate-like body 11A on the other side of the plate-like body 11A. One drain plate 13A is fixed with its periphery sandwiched between the inner edge of the frame that constitutes the plate-like body 11A and the pressing portion 14A. The other drain plate 13B is fixed with its periphery sandwiched between the inner edge of the frame that constitutes the plate-like body 11A and the pressing portion 14B.

[0038] Between each drain plate 13 (one drain plate 13A and the other drain plate 13B) and the plate-like body 11A, drainage channels 28A and 28B are formed, respectively, leading to the outside of the filter plate 10. Both drainage channels 28A and 28B are configured as water passages.

[0039] The drainage channels 28A formed on the back side of the filter cloth 18A in the central recess 12A are as shown in Figures 10 to 12, for example. In the example shown in Figures 10 to 12, multiple drainage channels 28A are formed in a groove shape on the lower end side (the lower vertical end side when installed) of one side of the base plate 11, and water can flow through each drainage channel 28A. One end (upper end) of each drainage channel 28A is located on the back side of the drainage plate 13A, and a part of the back surface of the drainage plate 13A faces the internal space of each drainage channel 28A. The other end (lower end) of each drainage channel 28A reaches the lower end of the filter plate 10, and the internal space of each drainage channel 28A is in communication with the space outside the filter plate 10. Furthermore, it is desirable that a space exists between the back surface of the drain plate 13A and the front surface of the plate-like body 11A, and that this space communicates with each drain channel 28A. With this configuration, moisture that flows into the back surface of the drain plate 13A can easily flow to the outside of the filter plate 10 through each drain channel 28A.

[0040] The drainage channels 28B formed on the back side of the filter cloth 18B in the central recess 12B are as shown in Figures 10, 13, and 14, for example. In the examples of Figures 10, 13, and 14, multiple drainage channels 28B are formed in a groove shape on the lower end side (the lower vertical end side when installed) of one side of the base plate 11, and water can flow through each drainage channel 28B. One end (upper end) of each drainage channel 28B is located on the back side of the drainage plate 13B, and a part of the back surface of the drainage plate 13B faces the internal space of each drainage channel 28B. The other end (lower end) of each drainage channel 28B reaches the lower end of the filter plate 10, and the internal space of each drainage channel 28B communicates with the space outside the filter plate 10. Furthermore, it is desirable that a space exists between the back surface of the drain plate 13B and the front surface of the plate-like body 11B, and that this space communicates with each drain channel 28B. With this configuration, moisture that flows into the back surface of the drain plate 13B can easily flow to the outside of the filter plate 10 through each drain channel 28B.

[0041] In the examples shown in Figures 10 to 15, a configuration is illustrated in which multiple drainage channels 28 are provided on the lower end side of the filter plate 10. However, any flow path that can discharge water that has flowed through the filter cloth 18 to the drainage plate 13 side to the outside of the filter plate 10 is acceptable.

[0042] As shown in Figures 1, 2, 3, and 5, the filter plate 10 has a pair of annular plate portions 15A and 15B fixed in one central recess 12A and the other central recess 12B of the substrate portion 11, respectively. The annular plate portions 15A and 15B have through-hole side projections 17A and 17B that protrude in the thickness direction of the filter plate 10. Multiple through-hole side projections 17A protrude from the annular plate portion 15A on one side, and these multiple through-hole side projections 17A are arranged around the hole portion 16, as shown in Figure 11. Similarly, multiple through-hole side projections 17B protrude from the annular plate portion 15B on the other side, and these multiple through-hole side projections 17B are arranged around the hole portion 16, as shown in Figure 13. The hole 16 is formed to communicate from one annular plate portion 15A to the other annular plate portion 15B of the pair of annular plate portions 15A and 15B. Specifically, the inside of the cylindrical portion connecting the pair of annular plate portions 15A and 15B is the hole 16. In this configuration, as shown in Figure 2, when one side of one filter plate 10 and the other side of the other filter plate 10 are placed on top of each other so as to press against each other, the through-hole side projection 17A on one side of the one filter plate 10 and the through-hole side projection 17B on the other side of the other filter plate 10 face each other. As shown in Figure 2, when the through-hole side projection 17A on one side of one filter plate 10 and the through-hole side projection 17B on the other side of the other filter plate 10 face each other, the distance between these through-hole side projections 17A and 17B (the distance between their tips) is smaller than the distance between the plates of the annular plate portions 15A and 15B, and may even be zero (i.e., the opposing through-hole side projections 17A and 17B may be in contact). Note that in the example shown in Figure 2, the filter cloth 18 is not interposed between the opposing through-hole side projections 17A and 17B.

[0043] Within one central recess 12A and the other central recess 12B, drain plate side projections 19 (one drain plate side projection 19A and the other drain plate side projection 19B) are formed, respectively, protruding in the thickness direction from the respective drain plate 13. One drain plate side projection 19A is fixed to at least one of the drain plate 13A or the plate-like body 11A, and is configured to protrude from the surface of the drain plate 13A in the thickness direction (the thickness direction of the filter plate 10). The drain plate side projection 19A has a tapered shape, becoming narrower as it approaches the tip in its protruding direction. In the example of Figure 4, a plurality of drain plate side projections 19A with such a configuration are arranged to surround the hole 16. The other drain plate side projection 19B is fixed to at least one of the drain plate 13B or the plate-like body 11A, and is configured to protrude from the surface of the drain plate 13B in the thickness direction (the thickness direction of the filter plate 10). The drain plate side projection 19B has a tapered shape, becoming narrower as it approaches the tip in its protruding direction. In the example in Figure 6, multiple drain plate side projections 19B with this configuration are arranged to surround the hole 16. When one side of one filter plate 10 and the other side of another filter plate 10 are placed on top of each other in a pressing manner, as shown in Figure 2, each drain plate side projection 19A on one side of the filter plate 10 and each drain plate side projection 19B on the other side of the other filter plate 10 face each other. When the drain plate side projection 19A on one side of the filter plate 10 and the drain plate side projection 19B on the other side of the other filter plate 10 face each other, as shown in Figure 2, the distance between these drain plate side projections 19A and 19B (the distance between their tips) is smaller than the distance between the opposing drain plates 13A and 3B. In the example shown in Figure 2, the filter cloths 18A and 18B are interposed between the opposing drain plate side protrusions 19A and 19B, and the filter cloths 18A and 18B are sandwiched between the opposing drain plate side protrusions 19A and 19B.

[0044] The filter press apparatus 1 shown in Figure 9 has such a filter plate structure 3. Specifically, as shown in Figures 15 and 16, the multiple filter plates 10 constituting the filter plate structure 3 are aligned in a predetermined position (i.e., a position in which the thickness direction of each filter plate 10 is in the same direction and the position of the outer edge of each filter plate 10 is aligned), and the multiple filter plates 10 can be moved along the guide rails 90 (guide rails 90A, 90B). Through this movement, adjacent filter plates 10 can move closer to and further apart from each other.

[0045] Although not shown in Figures 1 to 14, as shown in Figures 16 and 17, each filter plate 10 is provided with a pair of overhangs 41 and 42 that extend laterally from both the left and right sides of the base plate portion 11 of each filter plate 10. These pairs of overhangs 41 and 42 function as a pair of supported parts, and are supported while being placed on the guide rails 90A and 90B. As the pair of overhangs 41 and 42 move while being placed on the guide rails 90A and 90B, each filter plate 10 moves in a predetermined direction (the thickness direction of each filter plate 10) while maintaining a predetermined posture.

[0046] In addition to the filter plate structure 3 described above, the filter press apparatus 1 includes a holding device 50, a first injection device 60 (hereinafter also referred to as a slurry supply device), a second injection device 70 (hereinafter also referred to as an air supply device), a supply passage 62 for supplying the solid-liquid mixture 7, a supply passage 72 for supplying air, a first switching unit 81 for switching the opening and closing of the supply passage 62, a second switching unit 82 for switching the opening and closing of the supply passage 72, and so on. Although not shown in the figures, a control device (for example, an information processing device such as a computer) is also provided to control the operation (operating timing, control amount, etc.) of the holding device 50, the first injection device 60, the second injection device 70, the first switching unit 81, and the second switching unit 82.

[0047] The holding device 50 is an example of a switching device and comprises a pair of guide rails 90 (guide rails 90A, 90B), a drive device 54, and fixed walls 51, 52, which are assembled integrally. The drive device 54 comprises an action part 54C that acts on the filter plates 10 at the end of the filter plate group 5 (the end on the fixed wall 52 side), a drive shaft 54B connected to the action part 54C, and a drive unit 54A that moves the drive shaft 54B in a predetermined direction (the direction that maintains the thickness of each filter plate 10 of the filter plate group 5). When the drive unit 54A moves the action part 54C toward the fixed wall 51 side via the drive shaft 54B, the multiple filter plates 10 are pressed toward the fixed wall 51 side while maintaining a predetermined posture, and as shown in Figures 15 and 16, adjacent filter plates in the filter plate group 5 come into contact with each other. On the other hand, the drive unit 54A moves the operating unit 54C toward the fixed wall 52 via the drive shaft 54B, causing adjacent filter plates in the filter plate group 5 to be spaced apart from each other. For example, if a spacing regulating unit (not shown) is provided to regulate the spacing so that the maximum distance between adjacent filter plates in a plurality of filter plates 10 is a predetermined distance, then when the operating unit 54C operates to move a filter plate 10 toward the fixed wall 52 while engaging with or holding the filter plate 10 at the end of the filter plate group 5 (the end on the fixed wall 52 side), each filter plate will move so that adjacent filter plates are spaced apart from each other. Note that the example shown here is merely one example, and the holding device may have other configurations as long as it can move the filter plates closer together and further apart while aligning the plurality of filter plates 10 in a predetermined position (i.e., a position in which the thickness direction of each filter plate 10 is in the same direction and the position of the outer peripheral edge of each filter plate 10 is aligned).

[0048] In this way, by moving the working part 54C toward the fixed wall 51, the holding device 50 can arrange multiple filter plates 10 in an overlapping state as shown in Figures 15 and 16, and hold them in a holding state (first holding state) where the annular protrusion 24 of one filter plate 10 enters into the annular recess 34 of the other filter plate 10 and presses against the inside of the annular recess 34, and the opposing part 22 of one filter plate 10 and the opposing part 32 of the other filter plate 10 press against each other (see Figures 2 and 8 for the specific state between adjacent filter plates).

[0049] The first injection device 60 is a transfer device that transfers a solid-liquid mixture from a solid-liquid mixture containment section (e.g., a slurry containment tank) (not shown) to the filter plate group 5. When the first switching section 81 is open and the supply passage 62 is in communication with the holes 16 at the end of the filter plate group 5, the solid-liquid mixture can be injected into the interior of the filter plate group 5 via the supply passage 62. Specifically, as shown in Figures 15 and 16, when the filter plate group 5, consisting of multiple filter plates 10, is held in a first holding state by the holding device 50, the first injection device 60 injects the solid-liquid mixture 7 into the interior of the multiple filter plates 10 from the holes 16 of the filter plates 10 at one end of the filter plate group 5. The first switching unit 81 is a device that switches between a first stop state, which stops the inflow and outflow of fluid at one end of the filter plate group 5, and a first release state, which releases the first stop state. It is composed of a known solenoid valve that switches the supply passage 62 (pipe) between an open state and a closed state, and the opening and closing of the first switching unit 81 is controlled by a control device (not shown).

[0050] The second injection device 70 is configured as a known air supply device capable of pressurizing air, and can inject air into the filter plate group 5 via the supply passage 72 when the second switching unit 82 is in an open state and the supply passage 72 is in communication with the hole 16 at the end of the filter plate group 5. Specifically, as shown in Figures 15 and 16, when the filter plate group 5, consisting of a plurality of filter plates 10, is held in a first holding state by the holding device 50, the second injection device 70 injects air into the plurality of filter plates 10 from the hole 16 at the other end of the filter plate group 5 opposite to one end. The second switching unit 82 is a device that switches between a second stop state, which stops the inflow and outflow of fluid at the other end of the filter plate group 5, and a second release state, which releases the second stop state, and is configured as a known solenoid valve that switches the supply passage 72 (pipe) between an open state and a closed state, and the opening and closing of the second switching unit 82 is controlled by a control device (not shown).

[0051] In the filter press apparatus 1, as shown in Figure 16, when the holding device 50 is holding in the first holding state, the second switching unit 82 is switched to the second stop state (the supply path 72 is blocked) and the first switching unit 81 is switched to the first release state (the supply path 62 is open), the first injection device 60 injects the solid-liquid mixture 7 into the filter plate group 5. Then, after the solid-liquid mixture 7 is injected by the first injection device 60, and the holding device 50 is held in the first holding state as shown in Figures 15 and 16, the first switching unit 81 is switched to the first stop state (the supply passage 62 is blocked) and the second switching unit 82 is switched to the second open state (the supply passage 72 is open). The second injection device 70 injects air into the filter plate group 5, causing the air to flow from the hole 16 side at the other end to the drainage passage 28 side of each filter plate 10, and the liquid (water) of the solid-liquid mixture 7 inside the filter plate group 5 is discharged to the outside of the filter plate group 5 via the drainage passage 28 along with the air. The operating timing and operating time of each device are controlled by a control device (not shown).

[0052] Furthermore, in this configuration, as shown in Figures 16 and 17, a pair of restricting parts 94 (restricting parts 94A and 94B) are arranged above each of the pair of guide rails 90A and 90B. The pair of guide rails 90A and 90B are each positioned opposite each other on both sides of each filter plate 10 and extend along the thickness direction. The pair of restricting parts 94A and 94B are each positioned opposite each other on both sides of each filter plate 10 at a position above the vertical center of each filter plate 10 and extend along the thickness direction. Specifically, recesses 41A and 42A are formed on the upper surfaces of a pair of protruding parts 41 and 42 formed on each filter plate 10, and the pair of restricting parts 94A and 94B are provided, respectively, positioned within these recesses 41A and 42A and supported by the recesses 41A and 42A.

[0053] (Air purging operation) In the following representative example, the filter press device 1 described above constitutes part of the turbid water treatment system 100 as shown in Figure 20.

[0054] As described above, the filter press device 1 includes each filter plate portion 8, and a contact portion 9 positioned opposite the filter plate portion 8, which switches between a contact position where it is in close contact with the filter plate portion 8 and an open position away from the filter plate portion 8, and which together with the filter plate portion 8 constitutes a filter chamber when in the contact position. Furthermore, the filter press device 1 includes a holding device 50 (switching device) that switches between a contact state where the filter plate portion 8 and the contact portion 9 are in close contact and a separated state where the filter plate portion 8 and the contact portion 9 are separated, a first injection device 60 that injects a solid-liquid mixture into the filter chamber via a supply passage 62 (first supply passage), and a second injection device 70 (air supply device) that injects air into the filter chamber via a supply passage 72 (third supply passage).

[0055] Furthermore, as shown in Figure 20, the turbid water treatment system 100 includes a discharge passage 122 leading to a filter chamber, a first switching unit 81 (one switching unit) that switches the supply passage 62 (first supply passage) between a blocked state and an unlocked state, and a third switching unit 83 (another switching unit) that switches the discharge passage 122 between a blocked state and an unlocked state.

[0056] The turbid water treatment system 100 performs a first operation in which the first injection device 60 injects a solid-liquid mixture into the filter chamber when the above-mentioned tight-fitting state is achieved. Specifically, the first operation involves opening the first switching section 81, closing the second switching section 82, closing the third switching section 83, and using the pump 110 to fluidize the solid-liquid mixture in the supply passage 62 (first supply passage) to supply slurry (solid-liquid mixture) from the slurry tank 120, which is a storage tank where slurry is stored, to the filter press device 1 via the supply passage 62 (first supply passage).

[0057] After the first operation, the turbid water treatment system 100 performs a second operation in which the holding device 50 (switching device) separates the filter plate section 8 and the contact section 9, thereby detaching the cake from the filter chamber.

[0058] Furthermore, at a time different from the first and second operations (for example, after the second operation), the holding device 50 (switching device) is used to create a tight seal, and while maintaining the switching section 81 (one switching section) and switching section 83 (the other switching section) in a closed state, the second injection device 70 is used to inject air into the filter chamber, and the third operation is performed to maintain a compressed state in which the air is compressed within the filter chamber.

[0059] Then, while the system is in a compressed state due to the third operation, the second switching unit is switched to the unblocked state, and the fourth operation is performed to discharge air from the filter chamber through the discharge passage 122.

[0060] <Other Embodiments> This disclosure is not limited to the embodiments described above and in the drawings. For example, any combination of the features of the embodiments described above or below is possible as long as it does not contradict each other. Furthermore, any feature of the embodiments described above or below may be omitted unless explicitly stated as essential. In addition, the embodiments described above may be modified as follows.

[0061] In the embodiment described above, a filter plate 10 with a rectangular (square) outer edge shape was exemplified, but the outer edge shape of the filter plate may be circular, elliptical, or substantially rectangular, or any other shape. When the outer edge shape of the filter plate is circular, the first pressing portion may be configured as a circular frame along the periphery of the filter plate. The first pressing portion may also be located on the periphery side of the recessed portion, for example, slightly inward from the periphery of the filter plate. The recessed portion may be a recess in the thickness direction on the central side of the filter plate, and the outer edge shape is not limited to a rectangular shape, but may be circular, elliptical, substantially rectangular, or any other shape. The first pressing portion may be provided on the portion that is convex in the thickness direction on the periphery side of the filter plate, and the inner edge shape of the first pressing portion (inner edge shape of the frame) can be a variety of shapes such as circular, elliptical, or substantially rectangular. Similarly, the outer edge shape of the first pressing section (outer edge shape of the frame) can also be a variety of shapes, such as circular, elliptical, or roughly rectangular.

[0062] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is not limited to the embodiments disclosed herein, and is intended to include all modifications within the scope set forth in the claims or equivalents thereof. [Explanation of Symbols]

[0063] 1,201,301… Filter press device 3,203,303…Filter plate structure of a filter press device 7…Solid-liquid mixture 8,208…filter plate section 8A, 8B, 212A, 212B... recessed area 8C, 8D, 214A, 214B… First pressing section 8E, 8F, 222A, 222B…1st opposing part 8G, 8H, 224A, 224B…First seal section 9,209… Close-up section 9A, 9B, 242… Storage Units 9C, 9D, 244A, 244B, 344A, 344B… Second pressing section 9E, 9F, 252A, 252B, 352A, 352B…Second opposing part 9G,9H,234A,234B,334A,334B…Second seal part 11,211… Circuit board section 16,216…hole 18,218…filter cloth 100... Turbid water treatment system

Claims

[Claim 1] filter plate section, A portion is positioned opposite the filter plate portion, and its relative position to the filter plate portion switches between a close-contact position where it is in close contact with the filter plate portion and an open position away from the filter plate portion, and when in the close-contact position, the close-contact portion and the filter chamber together with the filter plate portion, A switching device that switches between a state in which the filter plate portion and the contact portion are in close contact and a state in which the filter plate portion and the contact portion are separated, A first injection device that injects a solid-liquid mixture into the filter chamber via a first supply channel, A second injection device for injecting air into the filter chamber, A discharge passage leading to the filter chamber, A switching unit that switches the first supply path between an interrupted state and an uninterrupted state, The aforementioned discharge passage is switched between a blocked state and an unlocked state, Equipped with, A first operation in which the solid-liquid mixture is injected into the filter chamber by the first injection device when the aforementioned tight-fitting state is achieved, After the first operation, a second operation is performed in which the filter plate portion and the contact portion are separated by the switching device to remove the cake from the filter chamber, A third operation is performed in which, at a time different from the first operation, while the contact state is maintained, air is injected into the filter chamber by the second injection device while the first switching unit and the other switching unit are kept in a shut-off state, and the compressed state in which the air is compressed within the filter chamber is maintained. A fourth operation involves switching the other switching unit to the unblocked state when the compression state is reached, and discharging air from the filter chamber through the discharge passage, A turbid water treatment system using a filter press device.

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