Concave plate filter and its filter membrane, membrane filter plate and membrane filter plate assembly

Abstract

The present disclosure relates to a filter membrane (1) for a filter plate assembly (10) of a concave plate filter such as a filter press or a tower press, and also to a membrane filter plate (5) and its assembly (10), as well as a concave plate filter. The membrane (1) comprises a sheet-like body (2) having a flexible structure, and a plurality of different attachment pins (3) on at least one side of the body (2), which are to be inserted into corresponding different attachment holes (9) of the corresponding filter plate (5) for attaching the membrane (1) to the filter plate (5). The attachment pins (3) are arranged along a sealing area (4) extending along the periphery of the filter membrane (1) and extending in a direction perpendicular to the membrane body (2). The attachment pins (3) are provided with an opening (3a) extending through the filter membrane (1) between their opposite sides.

Description

Technical Field

[0001] The present disclosure relates to recessed plate-type filters, such as filter presses and tower presses, and more particularly to filter membranes, membrane filter plates, and membrane filter plate assemblies for such filters. The present disclosure also relates to the recessed plate filters themselves. Background Art

[0002] In recessed plate filters, a membrane is used to squeeze the remaining liquid contents from the filter cake formed in the filter chamber. The membrane is usually attached to the associated filter plate by sandwiching it between the filter plate and a separate clamping member, or by providing the membrane and the filter plate with a bead and groove, respectively.

[0003] Where the diaphragm has been attached to the filter plate by clamping, the clamping components are typically secured with separate fasteners, such as screws and clamps, which are susceptible to corrosion in typical filtration environments. Furthermore, such attachments typically require access to both sides of the filter plate, necessitating manipulation of the plate during installation.

[0004] When the diaphragm is attached to the filter plate by inserting its crimped edge into a groove in the filter plate, the groove creates a discontinuity in the plate structure at an unfavorable location, where a local maximum in internal stress is present. This has led to a shortened filter plate life. Furthermore, the crimped edge and groove form pockets in which impurities carried by the compressed medium used to pressurize the diaphragm can accumulate or collect. This, in turn, can lead to premature wear of the diaphragm. Summary of the Invention

[0005] An object of the present disclosure is to provide a recessed plate filter and a filter diaphragm (filter membrane), a membrane filter plate, and a membrane filter plate assembly for such a filter, which provide improved life and facilitate installation.

[0006] The objects of the present disclosure are achieved by the filter membrane, membrane filter plate, membrane filter plate assembly and filter described herein, and a plurality of preferred embodiments of the present disclosure are provided.

[0007] According to a first aspect of the present disclosure, a filter membrane is provided for use in a filter plate assembly of a recessed plate filter, such as a filter press or a tower press, the filter membrane comprising a sheet-like body having a flexible structure, wherein the body further comprises a plurality of different attachment pins on at least one side thereof, the attachment pins being inserted into corresponding different attachment holes of a respective filter plate to attach the membrane to the filter plate; wherein the attachment pins are arranged along a sealing area extending along the periphery of the filter membrane; wherein the attachment pins extend in a direction perpendicular to the membrane body; and wherein the attachment pins are provided with openings extending through the filter membrane between opposite sides thereof.

[0008] The filter membrane can be suitable for a plate assembly of a recessed plate filter, wherein a collector duct can be formed cross-sectionally by a plurality of filter plates provided with corresponding cross-sectional openings, the collector duct being used to pressurize one side of the membrane in order to squeeze the filter cake.

[0009] At least the body of the filter membrane may be made of an elastic material.

[0010] An increased diameter portion may be formed on a distal end portion of the attachment pin.The plurality of attachment pins may be integrally formed with the diaphragm body.

[0011] The sealing area may be formed as a bead which at least partially surrounds the remainder of the diaphragm body.

[0012] The sealing area may be integral with the diaphragm body.The surface of the sealing area may be substantially flat in its portion not having pins or associated openings.

[0013] The sealing area may have an increased thickness relative to the remaining non-elevated portion of the diaphragm body.

[0014] According to a second aspect of the present disclosure, a membrane filter plate is provided, which is used for a membrane filter plate assembly of a recessed plate filter such as a filter press or a tower press, the membrane filter plate comprising: a frame area surrounding the rest of the filter plate and having an increased thickness relative to the rest of the filter plate, a web region on at least a first surface of the membrane filter plate, the web region being defined by the frame area and recessed relative to the frame area, and a sealing plane between the frame area and the web region, the sealing plane surrounding the web area and recessed relative to the frame area, the sealing plane of the membrane filter plate also comprising a plurality of different attachment holes for accommodating attachment pins of the filter membrane.

[0015] The frame area may be provided with openings therethrough for forming sections of collector ducts adapted to pressurize the filter membrane in order to squeeze the filter cake.

[0016] The sealing plane may have a substantially flat surface for abutting engagement with a sealing area of ​​the filter membrane.The attachment aperture may include an undercut.

[0017] According to a third aspect of the present disclosure, a membrane filter plate assembly is provided for a concave plate filter such as a filter press or a tower press, the membrane filter plate assembly comprising a filter membrane and a membrane filter plate according to the aforementioned aspects of the present disclosure, wherein the filter membrane is received by the membrane filter plate so that the sealing area abuts against the sealing plane, and the remainder of the diaphragm body is received in the web area of ​​the filter plate defined by the sealing plane, and wherein the attachment pin of the filter membrane is received in the attachment hole.

[0018] The membrane filter plate assembly may further comprise a plurality of pins inserted into the openings of the attachment pins. The pins may be hollow.

[0019] In the uncompressed state, the sealing area of ​​the filter membrane can be raised from the frame area of ​​the membrane filter plate.

[0020] The web region of the membrane filter plate may comprise at least one raised portion having a continuous closed groove, and the filter membrane may comprise at least one continuous closed bead, wherein the bead is received in the groove.

[0021] According to a fourth aspect of the present disclosure, a concave plate filter is provided, such as a filter press or a tower press, the filter comprising: a plurality of membrane filter plate assemblies according to the aforementioned aspects of the present disclosure, wherein the membrane filter plate assemblies are configured to be able to move toward each other to a closed position, in which a filter chamber is formed between adjacent membrane filter plate assemblies, and the membrane filter plate assemblies are configured to be able to move away from each other to an open position, in which the adjacent membrane filter plate assemblies are separated from each other; a filter medium, arranged between adjacent membrane filter plate assemblies; a translation device for moving the membrane filter plate assemblies toward each other so as to form a filter chamber between adjacent filter plates, and for moving the membrane filter plate assemblies away from each other so as to open the filter chamber; a feeding device for supplying slurry into the filter chamber; a recovery device for recovering filtrate from the filter chamber; and a discharge device for discharging a filter cake formed in the filter chamber.

[0022] The recessed plate filter may further include a plurality of chamber filter plate assemblies, wherein the membrane filter plate assemblies and the chamber filter plate assemblies are arranged in an alternating sequence to form the filter chambers between adjacent membrane filter plate assemblies and chamber filter plate assemblies.

[0023] The recessed plate filter may further include a compression device for providing a pressurized compression medium on a side of the filter membrane opposite to the filter chamber.

[0024] The present disclosure is based on the idea of ​​providing a filter membrane with studs, the membrane filter being provided with a corresponding plurality of holes so that the membrane can be attached to a plate by inserting the studs into these holes.

[0025] This provides multiple synergistic advantages.Firstly, the membrane can be attached to the plate from one side, so there is no need to rotate the heavy filter plate during the attachment process.

[0026] Furthermore, the pins and openings can be formed in the diaphragm and plate, respectively, thereby eliminating the need for separate components such as metal nuts, screws, or bushings that are susceptible to corrosion.

[0027] Furthermore, unlike a typical continuous bead that inserts into a corresponding groove, the use of separate pins and holes provides a structure in which no pocket is formed at the interface between the diaphragm and the plate (i.e., at the base of the bead). The absence of such a pocket prevents the accumulation or collection of impurities carried by the compression medium used to pressurize the diaphragm to squeeze the filter cake. The accumulation or collection of such impurities is undesirable because it can rub against the diaphragm and cause premature wear.

[0028] Finally, the solution according to the invention provides a structure in which there are no local maxima of internal stresses caused by the annular grooves in the membrane filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Hereinafter, the present disclosure will be described in more detail by way of preferred embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 Schematically illustrates a membrane filter plate assembly viewed from its membrane side according to an embodiment of the present disclosure;

[0031] Figure 2 Schematically shows the Figure 1 The cross section is taken along line AA;

[0032] Figure 3 Schematically showing a diaphragm side of a diaphragm filter plate according to an embodiment of the present disclosure viewed in a perspective view;

[0033] Figure 4 The figure schematically shows a diaphragm side of a diaphragm filter plate assembly according to an embodiment of the present disclosure viewed in a perspective view;

[0034] Figure 5 Schematically showing a plate side of a filter membrane according to an embodiment of the present disclosure viewed in a perspective view;

[0035] Figure 6 Schematically showing a chamber side of a filter membrane according to an embodiment of the present disclosure viewed in a perspective view;

[0036] Figure 7 Schematically showing a detailed view of the frame area, sealing plane and web area of ​​a membrane filter plate according to an embodiment of the present disclosure; and

[0037] Figure 8 The figure schematically shows a pin of a membrane filter plate assembly according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] According to a first aspect of the present disclosure, there is provided a filter membrane 1 for a filter plate assembly 10 of a recessed plate filter. Various well-known examples of such recessed plate filters include filter presses and tower presses.

[0039] The filter membrane 1 comprises a sheet-like body 2 having a flexible structure. That is, the structure of the membrane body 2 is capable of yielding without permanent deformation, thereby pressing the filter cake formed in the filter chamber of the associated filter.

[0040] Furthermore, the filter membrane 1 comprises, at least on one side of the body 2, a plurality of different attachment pins 3 for insertion into corresponding different attachment holes 9 of the respective filter plates 5 in order to attach the membrane 1 to the filter plates 5. The attachment pins 3 are arranged along a sealing area 4 extending along the periphery (circumference) of the filter membrane 1. Most preferably, the attachment pins 3 extend in a direction perpendicular to the membrane body 2.

[0041] In particular, the attachment pin 3 is provided with an opening 3a extending through the filter membrane 1 between opposite sides thereof.

[0042] This arrangement provides a structure that prevents impurities from forming or accumulating at the interface between the filter membrane 2 and the membrane filter plate 5 without using a separate, corrosion-prone attachment component. At the same time, the opening (i.e., the hollowness) of the pin enables the pressure between the bottom of the associated hole 9 and the surrounding environment to be equalized, thereby preventing the pin from being ejected from the hole 9, further ensuring a secure attachment between the filter membrane 2 and the filter plate 5.

[0043] Preferably (but not necessarily), the filter membrane 1 is adapted for use in a plate assembly 10 of a recessed plate filter, wherein the collector duct for applying pressure to one side of the membrane to squeeze the filter cake is formed cross-sectionally by a plurality of filter plates 5 provided with corresponding cross-sectional openings 6a. This solution according to the present disclosure is particularly advantageous in this type of filter, as contamination by impurities is a particular problem. This is because the cross-sectional collector duct is opened simultaneously with the opening of the filter chamber to discharge the filter cake. In this case, impurities can easily contaminate the open duct.

[0044] Preferably (but not necessarily), at least the body 2 of the filter membrane is made of an elastic material, such as a synthetic elastomer or rubber. This helps to achieve a flexible structure of the body 2 of the membrane 1.

[0045] In the embodiment according to the first aspect of the present disclosure, an increased diameter portion 3b is formed on the distal end of the attachment pin 3. This further improves the secure attachment of the diaphragm 1 to the membrane filter plate 5. Alternatively, the pin 3 may be formed between the proximal and distal ends of the pin 3.

[0046] Preferably (but not necessarily), the diameter increase portion 3b is formed as an annular bulge. Alternatively, the diameter increase portion 3b can be configured as one or more different protrusions, such as knobs. If a plurality of such different protrusions are provided, these protrusions are appropriately spaced apart from one another along the circumference of the pin 3.

[0047] Preferably, but not necessarily, the plurality of attachment pins 3 are formed integrally with the diaphragm body 2. Alternatively, the pins 3 may be provided as separate parts which are subsequently pushed through the diaphragm body 3 in order to attach these separate pins 3 to the diaphragm body 2.

[0048] In an embodiment according to the first aspect of the present disclosure, the sealing area 4 is formed as a bead which at least partially surrounds the remainder of the diaphragm body 2 .

[0049] Preferably (but not necessarily), the sealing area 4 is formed integrally with the diaphragm body 2 .

[0050] In an embodiment according to the first aspect of the present disclosure, the surface of the sealing area 4 is substantially flat in the portion thereof not having the pin 3 or the associated opening 3a. That is, the overall shape of the sealing area 4 is flat while allowing for local deviations that have a negligible effect on the attachment between the filter membrane 1 and the associated membrane filter plate 5. For example, in the context of the present disclosure, the sealing area 4 can be considered to be substantially flat while being provided with grooves or ribs to improve the sealing effect of the sealing area 4 (i.e., to increase the surface contact pressure). If such grooves or ribs are provided, they can preferably be arranged to extend annularly along the sealing area 4.

[0051] In the embodiment according to the first aspect of the present disclosure, the sealing area 4 has a greater thickness than the non-elevated portions of the remaining diaphragm body 2. However, it should be noted that the diaphragm body 2 may be provided with elevated portions (e.g., protrusions, knobs, etc.) which may have a greater local material thickness than the sealing area 4.

[0052] It should be noted that the first aspect of the present disclosure includes any combination of one or more embodiments or variations thereof described above.

[0053] According to a second aspect of the present disclosure, a membrane filter plate 5 is provided, which is used in a membrane filter plate assembly 10 of a recessed plate filter such as a filter press or a tower press.

[0054] The membrane filter plate 5 comprises a frame region 6 which surrounds the remainder of the filter plate 5 and has an increased thickness relative to the remainder of the filter plate 5 .

[0055] At least on a first surface of the membrane filter plate 5 , the membrane filter plate 5 further comprises a web region 7 which is delimited by the frame region 6 and is recessed relative to the frame region 6 .

[0056] The membrane filter plate 5 further comprises a sealing plane 8 between the frame region 6 and the web region 7. The sealing plane 8 surrounds the web region 7 and is recessed relative to the frame region 6.

[0057] In particular, the sealing plane 8 of the membrane filter plate 5 further comprises a plurality of different attachment holes 9 for receiving the attachment pins 3 of the filter membrane 1 , such as the attachment pins discussed in connection with the first aspect of the present disclosure.

[0058] Preferably (but not necessarily), the holes 9 are blind holes, which provide higher structural strength for the membrane filter plate 5 at the holes 9 compared to through holes.

[0059] In an embodiment according to the second aspect of the present disclosure, the frame region 6 is provided with an opening 6a therethrough to form a portion of a collector conduit suitable for pressurizing the filter membrane 1 so as to squeeze the filter cake.

[0060] Suitably, the openings 6a are in fluid communication with the web region 7 via a conduit extending therebetween.

[0061] Furthermore, the opening 6 a may be formed as an integral part of the frame region 6 , or alternatively as a separate unit attached to the remainder of the frame region 6 .

[0062] In an embodiment according to the second aspect of the present disclosure, the sealing plane 8 has a substantially flat surface for abutting the sealing area 4 of the filter membrane 1. That is, the overall shape of the sealing plane 8 is flat while allowing for local deviations that have a negligible effect on the attachment between the filter membrane 1 and the associated membrane filter plate 5. For example, in the context of the present disclosure, the sealing plane 8 can be considered to be substantially flat while also being provided with grooves or ribs to improve the sealing effect of the sealing plane 8 (i.e., to increase the surface contact pressure). If such grooves or ribs are provided, they can preferably be arranged to extend annularly along the sealing plane 8.

[0063] In an embodiment according to the second aspect of the present disclosure, the attachment holes 9 include undercuts 9a. This further improves the secure attachment of the diaphragm 1 to the membrane filter plate 5. Preferably, the undercuts can be formed at the bottom of the relevant holes 9. Alternatively, the undercuts can be formed between the proximal and distal ends of the holes 9.

[0064] Preferably (but not necessarily), the undercut is formed as an annular groove. Alternatively, the undercut can be provided as one or more distinct notches, such as knobs. If a plurality of such distinct notches are provided, these notches are suitably spaced from one another along the inner circumference of the hole 9.

[0065] It should be noted that the second aspect of the present disclosure includes any combination of one or more embodiments or variations thereof described above.

[0066] According to a third aspect of the present disclosure, a membrane filter plate assembly 10 for a recessed plate filter such as a filter press or a tower press is provided.

[0067] The membrane filter plate assembly 10 includes the filter membrane 1 according to the first aspect of the present invention as described above, and the membrane filter plate 5 according to the second aspect of the present invention as described above.

[0068] The filter membrane 1 is received by the membrane plate 5 such that the sealing area 4 abuts the sealing plane 8 and the remainder of the membrane body 2 is received in the web area 7 of the plate 5 defined by the sealing plane 8. The attachment pins 3 of the filter membrane 1 are received in the attachment holes 9.

[0069] In the embodiment according to the third aspect of the present disclosure, the plurality of pins 11 are inserted into the openings 3 a of the attachment pins 3 .

[0070] Preferably (but not necessarily), such pins 11 are made of a material that is more rigid than the pins. This arrangement further improves the secure attachment between the filter membrane and the membrane filter plate 5.

[0071] Preferably (but not necessarily), the pin 11 is hollow, which allows for pressure equalization between the bottom of the hole 9 and the surroundings.

[0072] In an embodiment according to the third aspect of the present disclosure, in the uncompressed state, the sealing area 4 of the filter membrane 1 is elevated from the frame area 6 of the membrane filter plate. This ensures that the sealing area 4 is compressed when adjacent filter plates are pressed together to close the filter chamber.

[0073] In an embodiment according to the third aspect of the present disclosure, the web region 7 of the membrane filter plate 5 includes at least one raised portion 7a having a continuous, closed groove 7b, and the filter membrane 1 includes at least one continuous, closed beaded edge 2a, wherein the beaded edge 2a is received within the groove 7c. This arrangement between the filter membrane 1 and the membrane filter plate 5 at the web region 7 of the membrane filter plate further ensures a secure attachment. Furthermore, because the groove 7b and the beaded edge 2a do not confine the filter membrane 1, pockets are not formed, and the accumulation of impurities is not considered negligible.

[0074] It should be noted that the third aspect of the present disclosure includes any combination of one or more embodiments described above or their variations.

[0075] According to a fourth aspect of the present disclosure, a concave plate filter is provided, such as a filter press or a tower press.

[0076] The filter comprises a plurality of membrane filter plate assemblies 10 according to the third aspect of the present disclosure, as described above. Furthermore, the membrane filter plate assemblies 10 are configured to be movable toward each other to a closed position, in which a filter chamber is formed between adjacent membrane filter plate assemblies, and an open position, in which adjacent membrane filter plate assemblies are separated from each other.

[0077] The filter also includes filter media disposed between adjacent membrane plate assemblies.

[0078] The filter further comprises a translation arrangement for moving the membrane plate assemblies 10 towards each other to form filter chambers between adjacent filter plates and moving the membrane plate assemblies away from each other to open the filter chambers.

[0079] The filter further comprises a feed device for feeding the slurry into the filter chamber.

[0080] The filter further comprises a recovery device for recovering the filtrate from the filtration chamber.

[0081] The filter further comprises a discharge device for discharging the filter cake formed in the filter chamber.

[0082] In an embodiment according to the fourth aspect of the present disclosure, the filter further comprises a plurality of chamber filter plate assemblies. In this case, the membrane filter plate assemblies 10 and the chamber filter plate assemblies are arranged in an alternating order so as to form a filter chamber between adjacent membrane filter plate assemblies 10 and chamber filter plate assemblies.

[0083] In an embodiment according to the fourth aspect of the present disclosure, the filter includes a compression device for providing a pressurized compression medium on a side of the filter membrane opposite to the filter chamber.

[0084] It should be noted that the fourth aspect of the present disclosure includes any combination of one or more embodiments described above or variations thereof.

[0085] Figure 1 Schematically, a membrane filter plate assembly 10 according to an embodiment of the present disclosure is shown as seen from its membrane side. In particular, a filter membrane 1 has been received by a membrane filter plate 5 such that a frame region 6 of the membrane filter plate 5 delimits the filter membrane 1 .

[0086] A plurality of pins 3 are provided on the sealing area 4 of the diaphragm 1 , spaced apart from one another along the sealing area 4 . A pin 11 is inserted into the pin 3 .

[0087] Figure 2 Schematically shows the Figure 1 FIG1 is a cross-section taken along line AA of FIG1. ​​This more clearly illustrates the mutual engagement between the diaphragm 1 and the membrane filter plate 5. In particular, the sealing area 4 abuts the sealing surface 8 of the membrane filter plate 5, while the portion of the filter membrane body 2 defined by the sealing area 4 is received by the web area 7 of the membrane filter plate 5. The pins 3 are inserted into the corresponding holes 9, and the pins 11 are inserted into the pins 3. Since the pins 11 and the pins 3 are hollow, pressure communication between the bottom of the hole 9 and the surrounding environment is allowed. Corresponding to the undercut formed to the hole 9, an increased diameter portion 3b is formed on the distal end of the pin 3.

[0088] Figure 3 Schematically shows Figure 1 The membrane side of the membrane filter plate 5 (without the membrane 1 ). An elevated portion 7a with a continuous closed groove 7b is provided on the web area 7 to provide additional attachment between the filter membrane 1 and the membrane filter plate 5 .

[0089] Figure 4 Schematically shows a perspective view of Figure 1 The diaphragm side of the membrane filter plate assembly.

[0090] Figure 5The plate side of a filter membrane 1 according to an embodiment of the present disclosure, i.e. the side facing the membrane filter plate to which it is attached when in use, is schematically shown as viewed in a perspective view. In particular, the sealing area 4 of the filter membrane 1 surrounds the rest of the filter membrane body 2. A plurality of pins 3 protruding from the sealing area 4 are spaced apart from one another along said sealing area 4. A continuous closed bead 2a is provided on the portion of the body 2 surrounded by the sealing area to provide additional attachment between the filter membranes. In particular, the bead 2a can be received in combination with the above Figure 3 In the groove 7c discussed.

[0091] Figure 6 Schematically shows a perspective view of Figure 5 The chamber side of the filter membrane, that is, the opposite side.

[0092] Figure 7 Schematically shows Figure 3 Detailed view of the frame area 6 , the sealing plane 8 and the web area 7 of the membrane filter plate 5 .

[0093] Figure 8 Schematically shown is a more detailed view of the pin 11. It can be seen that the hollow opening of the pin 11 extends to its bottom.

[0094] Although these aspects and embodiments have been described above with reference to a single-sided membrane filter plate assembly 10 (i.e., an arrangement in which the membrane 1 is located only on one side of the membrane filter plate 5), it should be noted that the present disclosure also includes an arrangement in which the filter membrane 1 is provided on both sides of the membrane filter plate.

Claims

1. A filter membrane (1), a filter plate assembly (10) for a concave plate filter, the filter membrane comprising a sheet-like body (2) having a flexible structure, the body (2) being capable of yielding without permanent deformation, thereby pressing a filter cake formed in a filter chamber of the concave plate filter, It is characterized by: The body (2) further comprises a plurality of different attachment pins (3) on at least one side thereof, the attachment pins being to be inserted into corresponding different attachment holes (9) of the respective membrane filter plates (5), so that the filter membrane (1) can be attached to the membrane filter plates (5) by inserting the attachment pins (3) into the attachment holes (9), wherein the attachment pins (3) are arranged along a sealing area (4) extending along the periphery of the filter membrane (1), wherein the attachment pin (3) extends in a direction perpendicular to the body (2), and The attachment pin (3) is provided with an opening (3a) passing through the filter membrane (1) between opposite sides thereof.

2. The filter membrane (1) according to claim 1, characterized in that The filter membrane (1) is suitable for a membrane filter plate assembly (10) of a concave plate filter, wherein a collector pipe is formed cross-sectionally by a plurality of membrane filter plates (5) provided with corresponding cross-sectional openings (6a), and the collector pipe is used to pressurize one side of the membrane to squeeze the filter cake.

3. The filter membrane (1) according to claim 1 or 2, characterized in that At least the body (2) of the filter membrane is made of elastic material.

4. The filter membrane (1) according to any one of claims 1 to 2, characterized in that An increased diameter portion (3b) is formed on the distal end portion of the attachment pin (3).

5. The filter membrane (1) according to any one of claims 1 to 2, characterized in that The plurality of attachment pins (3) are formed integrally with the body (2).

6. The filter membrane (1) according to any one of claims 1 to 2, characterized in that The sealing area is formed as a bead which at least partially surrounds the remainder of the body (2).

7. The filter membrane (1) according to any one of claims 1 to 2, characterized in that The sealing area (4) is integral with the body (2).

8. The filter membrane (1) according to any one of claims 1 to 2, characterized in that The surface of the sealing area (4) is flat in its portion which does not have the attachment pin (3) or the associated opening (3a).

9. The filter membrane (1) according to any one of claims 1 to 2, characterized in that The sealing area (4) has an increased thickness relative to the remaining non-elevated portion of the body (2).

10. A membrane filter plate (5), used for a membrane filter plate assembly (10) of a concave plate filter, the membrane filter plate comprising: a frame region (6) surrounding the remainder of the membrane filter plate (5) and having an increased thickness relative to the remainder of the membrane filter plate (5), - a web region (7) at least on the first surface of the membrane filter plate, the web region being delimited by the frame region and recessed relative to the frame region, and a sealing plane (8) between the frame region (6) and the web region (7), the sealing plane (8) surrounding the web region (7) and recessed relative to the frame region (6), It is characterized in that the sealing plane (8) of the membrane filter plate (5) further comprises a plurality of different attachment holes (9) for receiving the attachment pins (3) of the filter membrane (1). Wherein, the attachment hole (9) is a blind hole.

11. The membrane filter plate (5) according to claim 10, characterized in that: The frame area (6) is provided with an opening (6a) therethrough for forming the cross section of a collector duct adapted to pressurize the filter membrane (1) in order to squeeze the filter cake.

12. The membrane filter plate (5) according to claim 10 or 11, characterized in that: The sealing plane (8) has a flat surface for abutting against the sealing area (4) of the filter membrane (1).

13. The membrane filter plate (5) according to any one of claims 10 to 11, characterized in that: The attachment hole (9) includes an undercut portion (9a).

14. A membrane filter plate assembly (10) for a concave plate filter, characterized in that: The membrane filter plate assembly comprises a filter membrane (1) according to any one of claims 1 to 9, and a membrane filter plate (5) according to any one of claims 10 to 13. wherein the filter membrane (1) is received by the membrane filter plate (5) such that the sealing area (4) abuts against the sealing plane (8) and the remainder of the body (2) is received within the web area (7) of the membrane filter plate (5) defined by the sealing plane (8), and Therein, the attachment pin (3) of the filter membrane (1) is received in the attachment hole (9).

15. The membrane filter plate assembly (10) according to claim 14, characterized in that: The membrane filter plate assembly further comprises a plurality of pins (11) inserted into the openings (3a) of the attachment pins (3).

16. The membrane filter plate assembly (10) according to claim 15, characterized in that: The pin (11) is hollow.

17. The membrane filter plate assembly (10) according to any one of claims 14 to 16, characterized in that: In the uncompressed state, the sealing area (4) of the filter membrane (1) rises from the frame area (6) of the membrane filter plate.

18. The membrane filter plate assembly (10) according to any one of claims 14 to 16, characterized in that: The web area (7) of the membrane filter plate (5) comprises at least one raised portion (7a) having a continuous closed groove (7b), and wherein the filter membrane (1) comprises at least one continuous closed bead (2a), wherein the continuous closed bead (2a) is received in the continuous closed groove (7b).

19. A concave plate filter, characterized in that: The filter includes: A plurality of membrane filter plate assemblies (10) according to any one of claims 14 to 18, wherein the membrane filter plate assemblies (10) are configured to be movable toward each other into a closed position in which filter chambers are formed between adjacent membrane filter plate assemblies, and the membrane filter plate assemblies (10) are configured to be movable away from each other into an open position in which adjacent membrane filter plate assemblies are spaced apart from each other; Filter media, arranged between adjacent membrane filter plate assemblies; a translation device for moving the membrane filter plate assemblies toward each other to form a filter chamber between adjacent membrane filter plates, and moving the membrane filter plate assemblies away from each other to open the filter chamber; a feeding device for feeding slurry into the filter chamber; a recovery device for recovering filtrate from the filtration chamber; and The discharge device is used for discharging the filter cake formed in the filter chamber.

20. The concave plate filter according to claim 19, wherein The recessed plate filter further comprises a plurality of chamber filter plate assemblies, wherein the membrane filter plate assemblies (10) and the chamber filter plate assemblies are arranged in an alternating sequence so as to form the filter chambers between adjacent membrane filter plate assemblies (10) and chamber filter plate assemblies.

21. The concave plate filter according to claim 19 or 20, characterized in that The recessed plate filter further includes a compression device for providing a pressurized compression medium on a side of the filter membrane opposite to the filter chamber.

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