Belt type sludge filter press, zirconium oxide production wastewater treatment system and zirconium oxide production wastewater treatment method

Abstract

The invention discloses a belt type sludge filter press, a zirconia production wastewater treatment system and a zirconia production wastewater treatment method, and relates to the technical field of sewage and sludge treatment. The belt type sludge filter press comprises a first filter pressing belt, a second filter pressing belt, a first water receiving tank, a second water receiving tank, a vibration falling assembly and a sludge receiving assembly; the inner side wall of the second inclined part is in compression joint with the vibration-off assembly, and the vibration-off assembly can vibrate off mud spots adhered to the outer side wall of the second inclined part; the second filter pressing belt further comprises a third inclined part connected with the second inclined part, and one end, far away from the second inclined part, of the third inclined part is downwards inclined, so that transversely splashed mud spots are stopped. Splashing mud spots fall on the mud cakes and are output along with the mud cakes, so that the output rate of solid matters is increased, and the water consumption for later washing is reduced; mud spots discharged along with the mud cakes can accurately fall into the mud receiving assembly, convenient collection is achieved, manual sweeping is not needed, and the operation convenience and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage sludge treatment, and particularly relates to a belt sludge filter press, a zirconium oxide production wastewater treatment system and a treatment method. Background Art

[0002] A large amount of wastewater is generated during the production of zirconium oxide. This wastewater comes from different links of zirconium oxide production, so its composition is complex (for example, it contains various organic matters, inorganic matters, etc.).

[0003] Such sewage is usually treated by a multi-stage system: first, the slurry is separated from the wastewater, then the sludge filtration equipment is used to treat the slurry to obtain a cake, and finally the cake is treated by composting, solidification, combustion and other methods.

[0004] The belt filter press is a commonly used sludge filtration equipment, which has the technical advantages of strong continuity and large processing capacity. The belt filter press usually squeezes the slurry by using two filter belts to achieve filtration. However, during the process of discharging the cake, it is difficult for the cake to be completely separated from the filter belt, that is, mud spots will adhere to the surface of the filter belt. After the mud spots are washed later, muddy water will be re-formed, resulting in problems such as a decrease in the cake production rate and an increase in the washing water consumption. Summary of the Invention

[0005] In order to overcome the problem of "mud spots adhering to the surface of the filter belt" existing in the above background art, the present invention provides a belt sludge filter press, a zirconium oxide production wastewater treatment system and a treatment method.

[0006] The technical solutions adopted by the present invention to solve the above technical problems are as follows: A belt sludge filter press, comprising a first filter belt, a second filter belt, a first water receiving tank, a second water receiving tank, a shaking-off assembly and a mud receiving assembly; a water draining part, a biting part, a stretching and squeezing part, a pair of roller squeezing part and a discharge port are arranged between the first filter belt and the second filter belt; the first filter belt includes a first inclined part, the second filter belt includes a second inclined part arranged above the first inclined part, and the discharge port is arranged between the first inclined part and the second inclined part; the first filter belt and the second filter belt can rotate adaptively; the mud receiving assembly is arranged below the end of the first filter belt close to the discharge port; the inner side wall of the second inclined part is pressed against the shaking-off assembly, and the shaking-off assembly can shake off the mud spots adhering to the outer side wall of the second inclined part; the first filter belt further includes a horizontal part connected to the first inclined part, and the second filter belt further includes a third inclined part connected to the second inclined part; one end of the third inclined part far away from the second inclined part is inclined downward to block the laterally splashing mud spots.

[0007] As a further optimized solution of the present invention, the first inclined portion and the second inclined portion are arranged in a "<" shape; the horizontal portion is located below the third inclined portion, and the horizontal portion and the third inclined portion are arranged in a ">" shape.

[0008] As a further optimized solution of the present invention, a turning roller is provided at the connection position between the second inclined portion and the third inclined portion, and the turning roller is press-connected to the outer side wall position of the second filter press belt.

[0009] As a further optimized solution of the present invention, the first filter press belt is arranged below the second filter press belt; the second water receiving tank is arranged at the inner side position of the second filter press belt, and the first water receiving tank is arranged below the first filter press belt.

[0010] As a further optimized solution of the present invention, the first filter press belt further includes a vertical portion and a horizontal portion. The top and bottom ends of the vertical portion are respectively connected to the horizontal portion and the horizontal portion. The horizontal portion is located below the horizontal portion; an impact assembly is provided between the horizontal portion and the horizontal portion; the impact assembly can move longitudinally back and forth and impact the bottom surface of the horizontal portion and the top surface of the horizontal portion, respectively, for the pre-separation of the filter cake and the first filter press belt and the shedding of the filter cake residue.

[0011] The zirconia production wastewater treatment system includes a belt-type sludge filter press, and further includes an adjustment module, a magnetic flocculation module, an ultrafiltration module, and a concentration module; the concentration module includes an outer cylinder and an inner cylinder; the inner cylinder is vertically arranged in the inner cavity of the outer cylinder; the inner cylinder includes a first straight cylinder, a conical cylinder, and a second straight cylinder arranged coaxially; the top end of the conical cylinder is hermetically and fixedly connected to the bottom end of the first straight cylinder, and the bottom end of the conical cylinder is hermetically and fixedly connected to the top end of the second straight cylinder; a water permeable window is provided on the side wall of the conical cylinder, and a filter screen is installed in the water permeable window.

[0012] As a further optimized solution of the present invention, the adjustment module includes a pre-filtering pool and an adjustment pool that are interconnected; a basket grille is provided in the pre-filtering pool.

[0013] As a further optimized solution of the present invention, the magnetic flocculation module includes a coagulation pool, a magnetic mixing pool, a coagulant aid pool, and a sedimentation pool that are connected in sequence; booster impellers are respectively provided in the coagulation pool, the magnetic mixing pool, and the coagulant aid pool; a stirring and sludge scraping integrated machine, an inclined tube group, and an overflow trough are provided in the sedimentation pool; As a further optimized solution of the present invention, the magnetic flocculation module further includes a hydrocyclone separator.

[0014] The ultrafiltration module includes a cylinder body and a cylindrical filter membrane; the cylindrical filter membrane is arranged in the middle of the inner cavity of the cylinder body.

[0015] Method for treating wastewater from zirconia production, i.e., the steps of treating wastewater using a wastewater treatment system for zirconia production include: S1. Input the wastewater from zirconia production into the adjustment module, and output solids and primary wastewater; S2. Input the primary wastewater into the magnetic flocculation module, and output primary sludge and secondary wastewater; S3. Input the secondary wastewater into the ultrafiltration module, and output secondary sludge and tertiary wastewater; S4. Input the primary sludge and the secondary sludge into the concentration module, and output primary filtrate and concentrated sludge; S5. Input the concentrated sludge into the belt sludge filter press, and output secondary filtrate and cake.

[0016] In summary, the present invention has at least one of the following beneficial effects: (1) The structure of the present invention is simple and the function is reliable. The second inclined part is inclined, and the vibration dropping assembly can transmit vibration to the second inclined part to shake off the mud spots adhered to the outer side wall of the second inclined part; the mud spots fall on the cake and are output with the cake, thereby improving the output rate of solid substances and reducing the water consumption for later flushing.

[0017] (2) One end of the third inclined part far from the second inclined part is inclined downward, so as to block the laterally splashing mud spots. A blocking cavity is formed between the horizontal part and the third inclined part. The blocking cavity is opposite to and communicated with the opening of the discharge port; the laterally splashing mud spots hit the third inclined part and then fall on the cake and are discharged with the cake. The mud spots discharged with the cake can accurately fall into the mud receiving assembly, realizing convenient collection without manual cleaning, and improving the operation convenience and efficiency.

[0018] (3) Compared with setting a traditional vertical plate to block the laterally splashing mud spots, the present invention adopts a third inclined part and a horizontal part that can move forward. When the mud spots in the blocking cavity accumulate too much, the third inclined part and the horizontal part can bite the mud spots and the cake and discharge them, avoiding blockage.

[0019] (4) The turning roller is arranged inside the included angle position of the second inclined part and the third inclined part. The vibration dropping assembly is pressed against the second inclined part instead of the third inclined part, that is, the mud spots are shaken off before the turning roller compacts the mud spots, so that the mud spots fall more easily, quickly, and have a higher falling rate.

[0020] (5) The flat part is located directly below the horizontal part; an impact assembly is arranged between the flat part and the horizontal part; the impact assembly can move longitudinally and reciprocally and impact the bottom surface of the horizontal part and the top surface of the flat part, respectively, for pre-separation (i.e., pre-loosening) of the cake and the first filter press belt and the shedding of cake residues (the cake residues are the mud spots adhered to the flat part).

[0021] (6) The first permanent magnet and the second permanent magnet of the impact component are respectively arranged on the upper and lower sides of the electromagnet. After the electromagnet is energized to generate magnetism, it adsorbs the first permanent magnet and repels the second permanent magnet, or repels the first permanent magnet and adsorbs the second permanent magnet, which can drive the waterproof housing and the support shaft to move longitudinally, so as to impact the horizontal part or the flat part. When the direction of the current passing through the electromagnet changes repeatedly, it can drive the waterproof housing and the support shaft to move longitudinally back and forth, so as to realize continuous impact on the horizontal part and the flat part. The impact component uses electromagnetic drive, has a smaller volume and can be installed in a narrow space, and has a faster commutation speed and a lower failure rate.

[0022] (7) When the impact component impacts the horizontal part and the flat part, the sludge particles and water adhering to the first filter belt will be shaken off. Under the guiding action of the waterproof housing, the sludge particles and water will not flow into the sleeve, thus avoiding the problem of the support shaft being stuck. Brief Description of the Drawings

[0023] The following further describes the present application with reference to the drawings: Figure 1 It is a front view schematic diagram of the overall structure of the belt type sludge filter press; Figure 2 It is a schematic diagram of the installation position of the shaking-off component; Figure 3 It is a schematic diagram of the position and structure of the first inclined part and the second inclined part; Figure 4 It is a schematic diagram of the position and structure of the horizontal part and the third inclined part; Figure 5 It is a schematic diagram of the support frame structure; Figure 6 It is a side view schematic diagram of the connection structure between the cross brace and the vertical frame; Figure 7 It is a schematic diagram of the structure of the shaking-off component; Figure 8 It is a cross-sectional structure schematic diagram of the shaking-off component; Figure 9 It is a schematic diagram of the installation positions of the vertical part, the flat part and the impact component; Figure 10 It is a schematic diagram of the structure of the impact component; Figure 11 It is a schematic diagram of the state where the electromagnet adsorbs the second permanent magnet; Figure 12 It is a schematic diagram of the state where the electromagnet adsorbs the first permanent magnet; Figure 13 It is a vertical sectional schematic diagram of the support arm, the installation shell and the sleeve; Figure 14 It is an oblique top view schematic diagram of the waterproof housing; Figure 15 It is an oblique top view schematic diagram of the support shaft and the sleeve; Figure 16 Schematic diagram of the location and structure of the concave part; Figure 17 Schematic diagram of the process of the present invention; Figure 18 This is a schematic diagram of the cross-sectional structure of the concentration module; Figure 19 This is a schematic diagram of the cross-sectional structure of the adjustment module; Figure 20 This is a schematic diagram of the cross-sectional structure of the magnetic flocculation module; Figure 21 This is a schematic diagram of the cross-sectional structure of the ultrafiltration module.

[0024] Description of reference numerals: In the figure, 1. Regulating module; 11. Pre-filter tank; 111. Basket grille; 12. Regulating tank; 2. Magnetic flocculation module; 21. Coagulation tank; 22. Magnetic mixing tank; 23. Coagulation aid tank; 24. Sedimentation tank; 241. Mixer and scraper; 242. Inclined tube group; 243. Overflow tank; 3. Ultrafiltration module; 31. Cylinder; 32. Cylindrical filter membrane; 33. Booster pump; 4. Concentration module; 41. Outer cylinder; 42. Inner cylinder; 421. First straight cylinder; 422. Conical cylinder; 4221. Filter; 423. Second straight cylinder; 5. Belt-type sludge filter press; 51. First filter belt; 511. First inclined portion; 512. Horizontal portion; 513. Vertical portion; 514. Horizontal portion; 515. Impact assembly; 5151. Support arm; 5152. Mounting housing; 51521. Electromagnet; 5153. Sleeve; 5154. Support shaft; 51541. Roller; 5155. Waterproof cover; 5156. First permanent magnet; 5157. Second permanent magnet; 52. Second filter belt; 5 21. Second inclined portion; 522. Third inclined portion; 5221. Turning roller; 523. Concave portion; 5231. Third water receiving tank; 53. First water receiving tank; 54. Second water tank; 55. Shake-off assembly; 551. Shake-off roller; 5511. Accommodation notch; 552. Tapping roller; 553. End cap; 56. Mud receiving assembly; 57. Mud cake; 58. Guide roller; 581. Drive motor; 59. Support frame; 591. Vertical frame; 592. Cross brace; 501, drainage part; 5011, feeding cylinder; 502, biting part; 503, stretching and extrusion part; 504, roller extrusion part; 505, discharge port. DETAILED DESCRIPTION

[0025] Based on the above structural features of the present application, the implementation methods of the present application are further described: ReferenceFigures 1 - 2 , in this embodiment, a belt - type sludge filter - press 5 is provided, which includes a first filter - press belt 51, a second filter - press belt 52, a first water - receiving tank 53, a second water - receiving tank, a shaking - off assembly 55, and a sludge - receiving assembly 56.

[0026] Refer to Figures 1 - 2 , a water - draining part 501, a biting part 502, a stretching and squeezing part 503, a pair - roller squeezing part 504, and a discharge port 505 are provided between the first filter - press belt 51 and the second filter - press belt 52. Driven by the first filter - press belt 51 and the second filter - press belt 52, sludge (i.e., concentrated slurry) is successively conveyed into the water - draining part 501, the biting part 502, the stretching and squeezing part 503, and the pair - roller squeezing part 504 and then processed into a mud cake 57, and then output from the discharge port 505, thus achieving the dehydration effect.

[0027] Refer to Figures 1 - 2 , a number of guide rollers 58 are respectively provided on the inner and outer side walls of the first filter - press belt 51, and the guide rollers 58 are used to support the first filter - press belt 51; a number of guide rollers 58 are respectively provided on the inner and outer side walls of the second filter - press belt 52, and the guide rollers 58 are used to support the second filter - press belt 52; meanwhile, the structural supports for the water - draining part 501, the biting part 502, and the discharge port 505 are realized. A number of stretching rollers arranged in an S - shape are provided at the position of the stretching and squeezing part 503, and the first filter - press belt 51 and the second filter - press belt 52 are press - connected to the cylindrical surface position of the stretching rollers in an S - shape; when the sludge is conveyed through the position of the stretching and squeezing part 503, it is subjected to a lateral squeezing force, so that the water inside the sludge oozes out through the mesh holes of the first filter - press belt 51 / the second filter - press belt 52 to achieve dehydration. Squeezing rollers are respectively provided on both sides of the pair - roller squeezing part 504, and the squeezing rollers on both sides respectively squeeze the pair - roller squeezing part 504 and the sludge inside the pair - roller squeezing part 504, so that the water inside the sludge oozes out through the mesh holes of the first filter - press belt 51 / the second filter - press belt 52 to achieve dehydration.

[0028] Refer to Figure 3 And Figure 4 , the first filter - press belt 51 includes a first inclined part 511, the second filter - press belt 52 includes a second inclined part 521 arranged above the first inclined part 511, and the discharge port 505 is arranged between the first inclined part 511 and the second inclined part 521. One end of the first inclined part 511 far from the pair - roller squeezing part 504 is inclined upward, and one end of the second inclined part 521 far from the pair - roller squeezing part 504 is inclined upward, so as to discharge the mud cake 57 in an obliquely upward direction. During the process, the distance between the first inclined part 511 and the second inclined part 521 gradually increases to realize the separation of the second inclined part 521 from the mud cake 57 (under the action of the self - weight of the mud cake 57).

[0029] Refer to Figure 3 And Figure 4, since the included angle between the first inclined portion 511 and the second inclined portion 521 is usually 20 to 50 degrees, and the included angle between the second inclined portion 521 and the horizontal plane is usually 60 to 80 degrees.

[0030] Refer to Figure 4 , driven by the guide roller 58, the first filter press belt 51 and the second filter press belt 52 can rotate adaptively; the mud receiving assembly 56 is arranged below the end of the first filter press belt 51 near the discharge port 505.

[0031] Refer to Figure 3 And Figure 4 , the inner side wall of the second inclined portion 521 is in press contact with the vibration dropping assembly 55, and the vibration dropping assembly 55 can transmit vibration to the second inclined portion 521 to drop the mud spots adhered to the outer side wall of the second inclined portion 521 (when the second inclined portion 521 and the mud cake 57 are disengaged from each other, part of the mud spots are separated from the mud cake 57 and adhered to the outer side wall of the second inclined portion 521).

[0032] Refer to Figure 3 And Figure 4 , when the vibration dropping assembly 55 exerts an impact force (vibration force) on the back surface of the second inclined portion 521, there will be a problem of splashing when the mud spots are disengaged from the second inclined portion 521 (since the second inclined portion 521 is inclined, the direction of the moving speed of the mud spots has a horizontal component velocity); when the mud spots splash out from the discharge port 505, it is difficult to collect them through the mud receiving assembly 56, resulting in waste of material resources; if the splashed mud spots are collected manually, it will cause time-consuming, laborious and low-efficiency problems.

[0033] Refer to Figure 3 And Figure 4 , to avoid such problems: the first filter press belt 51 further includes a horizontal portion 512 connected to the first inclined portion 511, and the second filter press belt 52 further includes a third inclined portion 522 connected to the second inclined portion 521; one end of the third inclined portion 522 away from the second inclined portion 521 is inclined downward to block the laterally splashing mud spots. A stop cavity is formed between the horizontal portion 512 and the third inclined portion 522, and the stop cavity is opposite to and communicated with the opening of the discharge port 505. The laterally splashing mud spots hit the third inclined portion 522 and then fall on the mud cake 57, and are discharged from the stop cavity along with the mud cake 57.

[0034] Refer to Figure 3 And Figure 4 , a material passing gap is provided between the bottom end of the third inclined portion 522 and the horizontal portion 512, and the mud cake 57 and the mud spots on the upper surface of the mud cake 57 are conveyed out of the stop cavity through the material passing gap, avoiding the problem of mud spot accumulation in the discharge port 505 and the stop cavity. After the mud cake 57 and the mud spots on the upper surface of the mud cake 57 are conveyed out of the stop cavity through the material passing gap, they fall into the mud receiving assembly 56, realizing convenient, rapid and labor-saving collection.

[0035] Reference Figure 3 With Figure 4 , the first inclined portion 511 and the second inclined portion 521 are arranged in a "<" shape; the horizontal portion 512 is located below the third inclined portion 522, and the horizontal portion 512 and the third inclined portion 522 are arranged in a ">" shape.

[0036] Reference Figure 4 , a turning roller 5221 is provided at the connection position of the second inclined portion 521 and the third inclined portion 522, and the turning roller 5221 is arranged inside the included angle position of the second inclined portion 521 and the third inclined portion 522; the turning roller 5221 is press-connected to the outer side wall position of the second filter press belt 52. The turning roller 5221 is used for the turning of the second filter press belt 52 at this position. Since the mud spot is difficult to shake off when passing through the turning roller 5221 as it will be pressed against the surface of the second filter press belt 52 by the turning roller 5221; therefore, the shaking-off assembly 55 is press-connected to the second inclined portion 521 instead of the third inclined portion 522, that is, before the turning roller 5221 compacts the mud spot and the mud spot adheres loosely to the second inclined surface (during the process of the mud cake 57 separating from the second inclined portion 521, a pulling force will be applied to the mud spot, making the mud spot loose, the pulling force between the mud spot and the second inclined portion 521 decreases, and the mud spot has a tendency to fall off), the mud spot is shaken off, so that the mud spot falls off more easily, quickly, and has a higher falling rate.

[0037] Reference Figure 4 、 Figure 5 With Figure 6 , the belt type sludge filter press 5 further includes a support frame 59, and the support frame 59 includes two left and right vertical frames 591; the two left and right vertical frames 591 are fixedly connected by a plurality of cross braces 592, that is, both ends of the cross braces 592 are fixedly connected to the two vertical frames 591 by bolts or welding, so as to realize the stable setting of the support frame 59. Both ends of the guide roller 58, the tensioning roller, the squeezing roller, and the turning roller 5221 are rotatably connected to the two vertical frames 591 (for example, connected by bearings and bearing seats), so as to realize the stable setting of the belt type sludge filter press 5. A plurality of drive motors 581 are fixedly installed on the outer side wall of the vertical frame 591, the housing of the drive motor 581 is fixedly connected to the vertical frame 591 by bolts, and the output shaft of the drive motor 581 is connected to one or more of the guide roller 58, the tensioning roller, the squeezing roller, and the turning roller 5221 (for example, fixedly connected by bolts or movably connected by keys), and the drive motor 581 can drive the required guide roller 58, tensioning roller, squeezing roller, and turning roller 5221 to rotate, and then drive the first filter press belt 51 and the second filter press belt 52 to rotate, and then realize the transportation of sludge and the mud cake 57.

[0038] Reference Figure 3 、 Figure 7 With Figure 8, the cross-section of the vibration and shedding component 55 is in the shape of a gourd. The vibration and shedding component 55 includes a vibration and shedding roller 551, a knocking roller 552, and end caps 553; a receiving notch 5511 is provided at the cylindrical surface position of the vibration and shedding roller 551, and the knocking roller 552 is arranged in the receiving notch 5511 and can rotate around its own axis. There are two end caps 553, and the two end caps 553 are respectively fixedly installed at the two end face positions of the vibration and shedding roller 551 (for example, fixedly connected by bolts or fixedly connected by welding). An installation protrusion is provided at the outer edge position of the end cap 553, and the installation protrusion is convex; both ends of the knocking roller 552 are rotatably connected to the two installation protrusions (for example, rotatably connected by bearings). Combined Figure 5 with Figure 6 , both ends of the vibration and shedding roller 551 are respectively rotatably connected to the left and right vertical frames 591 (for example, rotatably connected by bearings and bearing seats), and the output shaft of one driving motor 581 is coaxially arranged and connected with the vibration and shedding roller 551 (for example, fixedly connected by bolts or movably connected by keys); the driving motor 581 can drive the vibration and shedding roller 551 to rotate around its own axis. During the process, the knocking roller 552 rotates around the axis of the vibration and shedding roller 551, so that the knocking roller 552 can impact the second inclined portion 521 and transmit the vibration force to the second inclined portion 521 to realize the vibration and shedding of the mud spots. When the knocking roller 552 contacts the second inclined portion 521, the knocking roller 552 rotates around its own axis, thereby reducing the friction between the knocking roller 552 and the second inclined portion 521, avoiding unnecessary scratches on the second filter press belt 52, and increasing the service life of the second filter press belt 52.

[0039] Refer to Figure 9 , the first filter press belt 51 further includes a vertical portion 513 and a horizontal portion 514. The top and bottom ends of the vertical portion 513 are respectively connected to the horizontal portion 512 and the horizontal portion 514 (for example, vertically connected, and a guide roller 58 is provided at the turning position), and the horizontal portion 514 is located directly below the horizontal portion 512; an impact component 515 is provided between the horizontal portion 514 and the horizontal portion 512; the impact component 515 can move longitudinally back and forth and impact the bottom surface of the horizontal portion 512 and the top surface of the horizontal portion 514, respectively for the pre-separation (i.e., pre-loosening) of the filter cake 57 and the first filter press belt 51 and the shedding of the filter cake residue (the filter cake residue is the mud spot adhered to the horizontal portion 514).

[0040] Refer to Figure 9The impact assembly 515 impacts the transverse portion 512 upward and quickly returns. During the process, the transverse portion 512 and the mud cake 57 (located on the upper surface of the transverse portion 512) are raised. Then, the transverse portion 512 is quickly restored under the action of its own elastic force and the tension of the guide roller 58. However, the mud cake 57 falls and is restored at a slow speed due to inertia (its mass is large) and cannot be affected by the elastic force, that is, the tension. A separation force is generated between the two, thereby creating a gap between the transverse portion 512 and the mud cake 57, thereby achieving pre-separation of the first filter press belt 51 and the mud cake 57, so that the mud cake 57 can be detached from the first filter press belt 51 later.

[0041] Reference Figure 9 When the mud cake 57 is transported to the bottom position of the upright portion 513, the mud cake 57 is separated from the first filter press belt 51, and then the mud cake 57 and the mud spots adhered to the surface of the mud cake 57 fall into the mud receiving assembly 56 for collection.

[0042] Reference Figure 9 Similarly, the impact assembly 515 strikes the flat portion 514 downward and quickly returns. During this process, the flat portion 514 and the mud spot (located on its lower surface) decrease in height. The flat portion 514 then quickly returns to its original position due to its own elastic force and the tension of the guide roller 58. However, the mud spot rises and returns to its original position more slowly due to inertia, generating a separating force between the two, thereby separating the mud spot from the first filter press belt 51. After falling off the first filter press belt 51, this part of the mud spot falls into the mud receiving assembly 56 for collection.

[0043] Reference Figure 9 The mud receiving assembly 56 is a box-shaped structure with an open top, which is used to receive the fallen mud cake 57, mud spots and mud cake residue.

[0044] Reference Figure 9 and Figure 10, the impact component 515 includes a support arm 5151, a mounting shell 5152, a sleeve 5153, a support shaft 5154, a waterproof cover shell 5155, a first permanent magnet 5156, and a second permanent magnet 5157; the support arm 5151 is horizontally placed, one end of the support arm 5151 is fixedly connected to the second water receiving tank or the support frame 59 (for example, fixedly connected by bolts), and the other end is fixedly connected to the outer side wall of the mounting shell 5152 (for example, fixedly connected integrally or by bolts), and the outer side wall of the mounting shell 5152 away from the support arm 5151 is fixedly connected to the sleeve 5153 (for example, fixedly connected integrally or by bolts); a longitudinally arranged electromagnet 51521 is provided inside the mounting shell 5152 (for example, fixedly connected by annular clamping, by bolts, or by gluing); the support shaft 5154 is longitudinally inserted into the sleeve 5153 and can move longitudinally, and rotatable rolling wheels 51541 are respectively installed at the top and bottom ends of the support shaft 5154. The waterproof cover shell 5155 has a cross-section in the shape of >, and the support arm 5151, the mounting shell 5152, and the sleeve 5153 are all placed in the inner cavity of the waterproof cover shell 5155, and the support shaft 5154 is inserted into the closed end of the waterproof cover shell 5155 and is fixedly connected in a sealed manner (for example, fixedly connected by welding or by bolts and sealing rings). The top end of the first permanent magnet 5156 is fixedly connected to the top surface of the inner cavity of the waterproof cover shell 5155 (for example, fixedly connected by bolts), the bottom end of the second permanent magnet 5157 is fixedly connected to the bottom surface of the inner cavity of the waterproof cover shell 5155 (for example, fixedly connected by bolts), and the first permanent magnet 5156 and the second permanent magnet 5157 are respectively arranged on the upper and lower sides of the electromagnet 51521. After the electromagnet 51521 is energized to generate magnetism, it adsorbs the first permanent magnet 5156 and repels the second permanent magnet 5157, or repels the first permanent magnet 5156 and adsorbs the second permanent magnet 5157, and can drive the waterproof cover shell 5155 and the support shaft 5154 to move longitudinally, so as to impact the horizontal part 512 or the flat part 514. When the direction of the current applied to the electromagnet 51521 is repeatedly changed, it can drive the waterproof cover shell 5155 and the support shaft 5154 to move longitudinally back and forth, so as to realize continuous impact on the horizontal part 512 and the flat part 514.

[0045] Refer to Figure 11 And Figure 12 , the top magnetic pole of the first permanent magnet 5156 is the same as the bottom magnetic pole of the second permanent magnet 5157, and the bottom magnetic pole of the first permanent magnet 5156 is the same as the top magnetic pole of the second permanent magnet 5157. Both the first permanent magnet 5156 and the second permanent magnet 5157 are bar magnets.

[0046] Refer to Figure 11, the top magnetic pole of the first permanent magnet 5156 and the bottom magnetic pole of the second permanent magnet 5157 are both N poles, and the bottom magnetic pole of the first permanent magnet 5156 and the top magnetic pole of the second permanent magnet 5157 are both S poles; when the bottom of the electromagnet 51521 is an N pole and the top is an S pole, the electromagnet 51521 adsorbs the second permanent magnet 5157 and repels the first permanent magnet 5156, thereby driving the waterproof cover 5155 and the support shaft 5154 to move upward, and using the rolling wheel 51541 below to impact the horizontal part 512.

[0047] Refer to Figure 12 , similarly, the top magnetic pole of the first permanent magnet 5156 and the bottom magnetic pole of the second permanent magnet 5157 are both N poles, and the bottom magnetic pole of the first permanent magnet 5156 and the top magnetic pole of the second permanent magnet 5157 are both S poles; when the bottom of the electromagnet 51521 is an S pole and the top is an N pole, the electromagnet 51521 adsorbs the first permanent magnet 5156 and repels the second permanent magnet 5157, thereby driving the waterproof cover 5155 and the support shaft 5154 to move downward, and using the rolling wheel 51541 below to impact the flat part 514.

[0048] The electromagnet 51521 is connected to an external power supply through a waterproof wire, and an alternating current is passed through the electromagnet 51521. When the external power supply is a direct current, a commutator is connected between the electromagnet 51521 and the external power supply.

[0049] The impact assembly 515 is electromagnetically driven, has a smaller volume and can be installed in a narrow space (usually, in order to minimize the height of the device as much as possible, the gap height between the horizontal part 512 and the flat part 514 is not enough to install a pusher such as an electric push rod), and has a faster commutation speed and a lower failure rate.

[0050] Refer to Figure 13 , rollers are installed at the inner wall position of the sleeve 5153 (for example, installed through a rotating shaft or through a bearing), and the rollers can rotate and are in pressure contact with the support shaft 5154, thereby reducing the friction between the sleeve 5153 and the support shaft 5154 to increase the impact speed. Refer to Figure 10 And Figure 13 , when the impact assembly 515 impacts the horizontal part 512 and the flat part 514, the sludge particles and water adhering to the first filter press belt 51 will be shaken off. Under the guiding action of the waterproof cover 5155, the sludge particles and water will not flow into the sleeve 5153, thereby avoiding the problem that the support shaft 5154 is stuck.

[0051] Refer to Figure 13 , Figure 14 And Figure 15 , the cross-section of the inner cavity of the sleeve 5153 is non-circular (for example, rectangular), and the outer side wall of the support shaft 5154 is adapted to the inner side wall of the inner cavity of the sleeve 5153, thereby preventing the support shaft 5154 from rotating.

[0052] Reference Figure 14 With Figure 15 , the support arm 5151 is fixedly connected to the outer side wall of the second water receiving tank by bolts, so as to realize the support of the pair of mounting shells 5152, sleeves 5153, support shafts 5154, and waterproof cover shells 5155. There are multiple groups (at least two groups) of the support arm 5151, mounting shell 5152, sleeve 5153, support shaft 5154, waterproof cover shell 5155, first permanent magnet 5156, and second permanent magnet 5157. Multiple support shafts 5154 are all connected to the same waterproof cover shell 5155, so as to avoid the problem of partial load jamming (when the weight of a single waterproof cover shell 5155 is pressed on a single support shaft 5154, a partial load force will be generated).

[0053] Reference Figure 9 With Figure 10 , the axial direction of the rolling wheel 51541 is arranged along the width direction of the first filter press belt 51. When the rolling wheel 51541 is pressed against the first filter press belt 51, the rolling wheel 51541 can rotate as the first filter press belt 51 moves, so as to avoid unnecessary scratches on the first filter press belt 51 and improve the service life of the first filter press belt 51.

[0054] Reference Figure 1 With Figure 2 , the first filter press belt 51 is arranged below the second filter press belt 52; the second water receiving tank is arranged at the inner side position of the second filter press belt 52 (that is, the second filter press belt 52 is arranged on the outer periphery of the second water receiving tank), and the first water receiving tank 53 is arranged below the first filter press belt 51. The water drainage part 501, the biting part 502, the tensioning and squeezing part 503, and the pair of roller squeezing parts 504 are all located directly above the second water receiving tank. Therefore, the fluid (this fluid is a mixture of water and mud) produced by the water drainage part 501, the biting part 502, the tensioning and squeezing part 503, and the pair of roller squeezing parts 504 drops into the second water receiving tank and is mixed to obtain secondary filtrate, avoiding the secondary filtrate from dropping onto the return part at the lower part of the first filter press belt 51.

[0055] Reference Figure 1 With Figure 2, a water spraying nozzle is installed inside the first water receiving tank 53, and the opening of the water spraying nozzle is arranged obliquely upward; the water spraying nozzle sprays cleaning liquid (such as water) on the return part at the lower part of the first filter press belt 51, so as to wash the mud spots still adhering to the first filter press belt 51 after passing through the horizontal part 514. The water spraying nozzle is fixedly installed at the bottom surface inside the cavity of the first water receiving tank 53 by bolts, or installed at the upper middle part inside the cavity of the first water receiving tank 53 through a support rod. The water spraying nozzle is connected to an external water source and an external water pump through a water supply pipe; the water spraying nozzle and the support rod are fixedly connected by bolts, and both ends of the support rod are fixedly connected to the two opposite side walls inside the cavity of the first water receiving tank 53 by bolts. The support rod and the guide roller 58 are arranged in parallel, and a plurality of water spraying nozzles are provided and arranged in an equidistant linear array along the axial direction of the support rod (that is, along the width direction of the first filter press belt 51), so as to wash the first filter press belt 51 passing through this position.

[0056] Refer to Figure 1 And Figure 5 , the first water receiving tank 53 and the second water receiving tank are respectively fixedly connected to the support frame 59 (for example, fixedly connected by bolts or fixedly connected by welding).

[0057] Refer to Figure 16 , a concave part 523 is provided at the top end of the second filter press belt 52, and a cleaning nozzle is provided above the concave part 523. The cleaning nozzle is connected to a liquid pump and an external water source through a water pipe. The cleaning nozzle can spray a liquid column onto the upper surface of the concave part 523, so as to wash the second filter press belt 52. Refer to Figure 5 And Figure 16 , a third water receiving tank 5231 is provided below the concave part 523, and the third water receiving tank 5231 is fixedly connected to the support frame 59 (for example, fixedly connected by bolts or fixedly connected by welding). The washing water on the concave part 523 flows down from both sides and drops into the third water receiving tank 5231.

[0058] Drain pipes are respectively provided at the bottoms of the first water receiving tank 53, the second water receiving tank and the third water receiving tank, and the drain pipes are connected and communicated with an external sewage pool.

[0059] Refer to Figure 17 , a zirconia production wastewater treatment system, including a belt type sludge filter press 5, and further including an adjustment module 1, a magnetic flocculation module 2, an ultrafiltration module 3 and a concentration module 4.

[0060] Refer to Figure 17 And Figure 18, the concentration module 4 includes an outer cylinder 41 and an inner cylinder 42; the inner cylinder 42 is vertically arranged inside the inner cavity of the outer cylinder 41, and a water collection cavity is provided between the inner cylinder 42 and the outer cylinder 41. The inner cylinder 42 includes a first straight cylinder 421, a conical cylinder 422, and a second straight cylinder 423 arranged coaxially; the top end of the conical cylinder 422 is hermetically and fixedly connected to the bottom end of the first straight cylinder 421 (for example, by integral connection, by welding connection, or by a sealing ring and a flange connection), and the bottom end of the conical cylinder 422 is hermetically and fixedly connected to the top end of the second straight cylinder 423 (for example, by integral connection, by welding connection, or by a sealing ring and a flange connection); a water permeable window is provided on the side wall of the conical cylinder 422, and a filter screen 4221, a filter cloth, or a filter plate (for example, a plate structure made of a multi-porous material) is installed in the water permeable window. The top end of the inner cylinder 42 and the top end of the outer cylinder 41 are hermetically and fixedly connected by an annular top plate (for example, by welding connection), and the bottom end of the inner cylinder 42 and the bottom end of the outer cylinder 41 are hermetically and fixedly connected by an annular bottom plate (for example, by welding connection). After the primary slurry and the secondary slurry are injected into the inner cylinder 42 and left standing, the water inside seeps out through the filter screen 4221 to obtain concentrated slurry and primary filtrate (the seeping water entangled with some impurity particles is the primary filtrate). The bottom end of the inner cylinder 42 extends out of the inner cavity of the outer cylinder 41, and a valve body is provided at the bottom end of the inner cylinder 42. Closing this valve body can achieve standing; opening this valve body can discharge the concentrated slurry. The annular bottom plate is provided with a drain pipe, the drain pipe is communicated with the water collection cavity, and a valve body is provided at the bottom end of the drain pipe. Opening this valve body can discharge the primary filtrate. The concentration module 4 is supported by an externally provided bracket, for example, a bracket is provided on the outer side wall of the outer cylinder 41; the bracket is a conventional existing technology in the industry and will not be elaborated here.

[0061] Referring to Figure 18 , the inner diameter of the first straight cylinder 421 is larger than the inner diameter of the second straight cylinder 423, which is convenient for injecting the primary slurry and the secondary slurry.

[0062] Referring to Figure 2 , Figure 5 With Figure 18 , above the water drainage part 501, there is a feeding cylinder 5011, and the feeding cylinder 5011 is fixedly connected to the support frame 59 (for example, by bolt connection); the concentrated slurry discharged from the inner cylinder 42 is input into the feeding cylinder 5011 (for example, the concentration module 4 is arranged above the concentrated slurry, or a transfer vehicle / screw conveyor is used for transfer), and then it falls on the water drainage part 501.

[0063] Referring to Figure 17 With Figure 19, the adjustment module 1 includes a pre-filtering tank 11 and an adjustment tank 12 that are interconnected; a basket grille 111 is provided in the pre-filtering tank 11. A drainage channel is provided at the bottom end of the side wall of the pre-filtering tank 11, and both ends of the drainage channel are respectively connected to the pre-filtering tank 11 and the adjustment tank 12; the drainage channel is located in the upper middle part of the side wall of the adjustment tank 12. Sewage with different compositions is generated in different treatment stages of zirconia. All of this sewage is injected into the pre-filtering tank 11, and after filtering out large solid substances, it is mixed and statically settled in the adjustment tank 12 to obtain primary wastewater with relatively uniform composition, which is convenient for later treatment.

[0064] Refer to Figure 17 And Figure 20 , the magnetic flocculation module 2 includes a coagulation tank 21, a magnetic mixing tank 22, a coagulant aid tank 23, and a sedimentation tank 24 that are connected in sequence; pressure-increasing impellers are respectively provided in the coagulation tank 21, the magnetic mixing tank 22, and the coagulant aid tank 23. The pressure-increasing impellers are connected to the output shafts of external motors, and the external motors are fixed on the top openings of the coagulation tank 21, the magnetic mixing tank 22, and the coagulant aid tank 23 through brackets. A stirring and sludge scraping integrated machine 241, an inclined tube group 242, and an overflow trough 243 are provided in the sedimentation tank 24. The top fixed end of the stirring and sludge scraping integrated machine 241 is fixed on the top opening of the sedimentation tank 24 through a bracket; an installation slope is provided in the upper middle part of the sedimentation tank 24, and the inclined tube group 242 is installed at the slope height position (for example, detachably connected by bolts); the overflow trough 243 is fixedly installed at the top position of the inner side wall of the sedimentation tank 24, and the overflow trough 243 is connected and communicated with an external discharge pipe; the secondary wastewater is discharged through the external discharge pipe. A sewage discharge port is provided at the bottom of the sedimentation tank 24, and the flocculation slurry is discharged through the sewage discharge port. The magnetic flocculation module 2 further includes a hydrocyclone separator or a centrifuge. The flocculation slurry is injected into the hydrocyclone separator or the centrifuge. After removing and recovering the magnetic particles in the flocculation slurry, primary slurry is obtained.

[0065] Refer to Figure 17 And Figure 21 , the ultrafiltration module 3 includes a cylinder body 31 and a cylindrical filter membrane 32; the cylindrical filter membrane 32 is arranged in the middle of the inner cavity of the cylinder body 31. An inner support frame is provided inside the cylindrical filter membrane 32 to achieve support. Installation rings are respectively provided at both ends of the inner support frame. The installation rings are hermetically and fixedly connected to the ends of the cylindrical filter membrane 32 (for example, by heat melting connection or by a compression ring and bolts), and the installation rings are hermetically and fixedly connected to both end faces of the inner cavity of the cylinder body 31 (for example, by a sealing ring and bolts). The cylindrical filter membrane 32 divides the inner cavity of the cylinder body 31 into a central chamber and a peripheral chamber. The secondary wastewater is injected into the central chamber and penetrates the cylindrical filter membrane 32 under the action of an external pressure to achieve ultrafiltration.

[0066] Refer to Figure 21, the liquid inlet pipe and the slurry outlet pipe of the cylinder body 31 are respectively arranged at the central positions of the two end faces, and the liquid inlet pipe and the slurry outlet pipe are directly communicated with the two ends of the central chamber respectively. The side wall of the cylinder body 31 is also provided with a liquid outlet pipe, which is directly communicated with the outer peripheral chamber. The liquid inlet pipe has a tee structure, one opening is communicated with the central chamber, one opening is communicated with the booster pump 33, and the other opening is used for injecting secondary wastewater; the slurry outlet pipe is used for discharging secondary slurry, and the liquid outlet pipe is used for discharging tertiary wastewater. The booster pump 33 is used to apply pressure to the secondary wastewater in the central chamber, and the driver penetrates the cylindrical filter membrane 32; the booster pump 33 is, for example, a plunger type booster liquid pump.

[0067] The method for treating zirconia production wastewater, that is, the steps of treating wastewater by using a zirconia production wastewater treatment system include: S1. Input the zirconia production wastewater into the regulation module 1, and output solid matter and primary wastewater.

[0068] S2. Input the primary wastewater into the magnetic flocculation module 2, and output primary slurry and secondary wastewater; during the process, (the user) adds a flocculant into the coagulation tank 21, adds magnetic particles into the magnetic mixing tank 22, and adds a coagulant aid into the coagulant aid tank 23.

[0069] S3. Input the secondary wastewater into the ultrafiltration module 3, and output secondary slurry and tertiary wastewater.

[0070] S4. Input the primary slurry and the secondary slurry into the concentration module 4, and output primary filtrate and concentrated slurry.

[0071] S5. Input the concentrated slurry into the belt filter press 5, and output secondary filtrate and cake 57.

[0072] The flocculant is, for example, aluminum sulfate, alum, ferrous sulfate, ferric chloride, polyacrylamide, etc., and the coagulant aid is, for example, quicklime, activated silica, activated water glass, sodium silicate, etc., which are all conventional existing technologies in the industry and will not be elaborated here.

[0073] Both the first permanent magnet 5156 and the second permanent magnet 5157 are made of permanent magnetic materials (such as aluminum-nickel-cobalt series permanent magnetic alloys, iron-chromium-cobalt series permanent magnetic alloys, permanent ferrite, etc.).

[0074] The structure of the present invention is simple and the function is reliable. The mud spots adhered to the second filter press belt 52 are shaken off by the shaking-off assembly 55, which improves the yield of solid matter (including cake 57, mud spots and cake residues) and reduces the water consumption for later flushing.

[0075] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0076] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In summary, for those skilled in the art, under the guidance of the present invention, without departing from the principle and spirit of the present invention, the changes, modifications, substitutions, and deformations made to the present invention still fall within the protection scope of the present invention.

Claims

1. Belt type sludge filter press, characterized in that: It includes a first filter press belt (51), a second filter press belt (52), a first water receiving tank (53), a second water receiving tank, a shaking component (55) and a mud receiving component (56); A water draining part (501), a biting part (502), a stretching and squeezing part (503), a pair of roller squeezing part (504) and a discharge port (505) are provided between the first filter press belt (51) and the second filter press belt (52); the first filter press belt (51) includes a first inclined part (511), the second filter press belt (52) includes a second inclined part (521) arranged above the first inclined part (511), and the discharge port (505) is arranged between the first inclined part (511) and the second inclined part (521); The first filter press belt (51) and the second filter press belt (52) can rotate adaptively; the mud receiving component (56) is arranged below the end of the first filter press belt (51) close to the discharge port (505); The inner side wall of the second inclined part (521) is in pressure contact with the shaking component (55), and the shaking component (55) can shake off the mud spots adhered to the outer side wall of the second inclined part (521); The first filter press belt (51) further includes a horizontal part (512) connected to the first inclined part (511), and the second filter press belt (52) further includes a third inclined part (522) connected to the second inclined part (521); one end of the third inclined part (522) far from the second inclined part (521) is arranged to incline downward, so as to block the laterally splashing mud spots.

2. The belt sludge filter press according to claim 1, wherein: The first inclined part (511) and the second inclined part (521) are arranged in a "<" shape; the horizontal part (512) is located below the third inclined part (522), and the horizontal part (512) and the third inclined part (522) are arranged in a ">" shape.

3. The belt sludge filter press according to claim 2, characterized in that: A turning roller (5221) is arranged at the connection position of the second inclined part (521) and the third inclined part (522), and the turning roller (5221) is in pressure contact with the outer side wall position of the second filter press belt (52).

4. The belt sludge filter press according to claim 3, characterized in that: The first filter press belt (51) is arranged below the second filter press belt (52); the second water receiving tank is arranged at the inner side position of the second filter press belt (52), and the first water receiving tank (53) is arranged below the first filter press belt (51).

5. The belt sludge filter press according to claim 4, characterized in that: The first filter press belt (51) further includes a vertical part (513) and a horizontal part (514), the top and bottom ends of the vertical part (513) are respectively connected to the horizontal part (512) and the horizontal part (514), and the horizontal part (514) is located below the horizontal part (512); an impact component (515) is arranged between the horizontal part (514) and the horizontal part (512); the impact component (515) can move longitudinally back and forth and impact the bottom surface of the horizontal part (512) and the top surface of the horizontal part (514), which are respectively used for the pre-separation of the mud cake (57) and the first filter press belt (51) and the falling off of the mud cake residues.

6. A zirconia production wastewater treatment system, characterized in that: It includes the belt type sludge filter press (5) described in claim 5, and further includes an adjustment module (1), a magnetic flocculation module (2), an ultrafiltration module (3) and a concentration module (4); The concentration module (4) includes an outer cylinder (41) and an inner cylinder (42); the inner cylinder (42) is vertically arranged in the inner cavity of the outer cylinder (41); the inner cylinder (42) includes a first straight cylinder (421), a conical cylinder (422) and a second straight cylinder (423) arranged coaxially; the top end of the conical cylinder (422) is hermetically and fixedly connected to the bottom end of the first straight cylinder (421), and the bottom end of the conical cylinder (422) is hermetically and fixedly connected to the top end of the second straight cylinder (423); a water permeable window is arranged on the side wall of the conical cylinder (422), and a filter screen (4221) is installed in the water permeable window.

7. The zirconia production wastewater treatment system according to claim 6, characterized in that: The adjustment module (1) includes a pre-filtering tank (11) and an adjustment tank (12) which are communicated with each other; a basket grille (111) is arranged in the pre-filtering tank (11).

8. The zirconia production wastewater treatment system according to claim 7, characterized in that: The magnetic flocculation module (2) includes a coagulation tank (21), a magnetic mixing tank (22), a coagulant aid tank (23) and a sedimentation tank (24) which are communicated in sequence; booster impellers are respectively arranged in the coagulation tank (21), the magnetic mixing tank (22) and the coagulant aid tank (23); a stirring and sludge scraping integrated machine (241), an inclined tube group (242) and an overflow trough (243) are arranged in the sedimentation tank (24); The magnetic flocculation module (2) further includes a hydrocyclone separator.

9. The zirconia production wastewater treatment system according to claim 8, wherein: The ultrafiltration module (3) includes a cylinder body (31) and a cylindrical filter membrane (32); the cylindrical filter membrane (32) is arranged in the middle of the inner cavity of the cylinder body (31).

10. A method for treating wastewater from zirconia production, characterized in that, The steps of treating wastewater by using the zirconia production wastewater treatment system described in claim 9 include: S1. Input the zirconia production wastewater into the adjustment module (1) to output solid substances and primary wastewater; S2. Input the primary wastewater into the magnetic flocculation module (2) to output primary sludge and secondary wastewater; S3. Input the secondary wastewater into the ultrafiltration module (3) to output secondary sludge and tertiary wastewater; S4. Input the primary sludge and the secondary sludge into the concentration module (4) to output primary filtrate and concentrated sludge; S5. Input the concentrated sludge into the belt type sludge filter press (5) to output secondary filtrate and a cake (57).

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