Flocculation combined with plate-and-frame filter pressing dredged sludge rapid dewatering device and dewatering method

Abstract

The application discloses a flocculation combined plate-frame pressure filtration dredged sludge rapid dewatering device and method, and relates to the technical field of sewage treatment equipment. The device comprises a sedimentation tank for depositing sludge installed above a base. The flocculation combined plate-frame pressure filtration dredged sludge rapid dewatering device and method can quickly collect flocculants floating on the water surface through the transverse movement of the first and second fishing nets, and then rotate to generate centrifugal force to shake off a large amount of water on the surface of the flocculants, reduce the water content in the flocculants, reduce the overall sludge volume, facilitate transportation and cleaning, and simultaneously adopt synchronous operation of the swing mechanism and the opening and closing mechanism. Through the reciprocating movement of the transverse swing and the longitudinal swing, the laminar state of the water flow can be effectively broken, the flow and disturbance of the fluid can be promoted, and the sludge impurities gathered into groups can be broken, which is helpful to faster removal of suspended solids and settled sludge, improves the treatment capacity of the sedimentation tank, and prevents excessive aggregation of the sludge to form a hard sludge layer.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, specifically to a rapid dewatering device and method for flocculation combined with plate and frame filter press dredging and sludge removal. Background Technology

[0002] The flocculation combined plate and frame filter press dredging sludge dewatering device is a highly efficient sludge treatment equipment, mainly used for sludge dewatering in urban sewage treatment, river dredging, and other fields. This device combines flocculation and filter press technologies. Chemical flocculants are used to aggregate fine solid particles into larger flocs, improving settling and filterability. In the process, the sludge first passes through a flocculation tank where an appropriate amount of flocculant is added, causing the sludge particles to flocculate into clumps. Subsequently, these flocs enter a plate and frame filter press, where mechanical pressure squeezes out the water, achieving solid-liquid separation.

[0003] Existing flocculation combined plate and frame filter press dredged sludge dewatering devices combine a sedimentation tank and a plate and frame filter press to settle wastewater and compress most of the sludge in the water into sludge cakes for rapid dewatering. However, during this process, the flocculant reacts with the wastewater, and most of the lighter flocs float to the surface. If not treated in time, this leads to an excessive amount of lighter algae impurities, affecting the subsequent sludge cake formation. Furthermore, since the wastewater in the sedimentation tank is mostly stagnant, lighter and heavier impurities tend to adhere and clump together, preventing some lighter impurities from floating and hindering their removal. Therefore, this invention proposes a flocculation combined plate and frame filter press dredged sludge rapid dewatering device and method. Summary of the Invention

[0004] The purpose of this invention is to provide a rapid dewatering device and method for flocculation combined with plate and frame filter press dredging to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rapid dewatering device for flocculation combined with plate and frame filter press dredging, comprising a sedimentation tank for settling sludge installed above a base, wherein hydraulic push rods for assisting lifting and lowering of bidirectional electric guide rails are fixedly installed at both ends of the surface of the sedimentation tank.

[0006] Above the No. 1 and No. 2 electric slides, there is a docking rotation mechanism to throw off the surface moisture of the flocculants.

[0007] The bottom of the first and second half-shafts inside the sedimentation tank are respectively fixedly connected to the first and second scooping nets for scooping suspended flocs. The inner wall of the middle part of the sedimentation tank is equipped with a swing mechanism to agitate the water flow. The outer sides of the first and second half-shafts are connected to an opening and closing mechanism to break the aggregation state of the sediment.

[0008] The docking and rotating mechanism, the No. 1 scooping net, and the No. 2 scooping net work together to scoop up suspended flocs and rotate them to throw off surface water. The No. 1 scooping net and the No. 2 scooping net rise and drive the swing mechanism and the opening and closing mechanism to operate synchronously, stirring the water flow horizontally and vertically.

[0009] Furthermore, a first electric slide and a second electric slide are electrically slidably connected above the bidirectional electric guide rail. The first and second electric slides are respectively movably connected through a first half-shaft and a second half-shaft, which are connected to a docking rotation mechanism.

[0010] Furthermore, a plate and frame filter press assembly for pressing filter cake is installed above the base on one side of the sedimentation tank. A conveying pipeline assembly for conveying and outputting sewage or clean water is connected between the sedimentation tank and the plate and frame filter press assembly. Both ends of the inner wall of the sedimentation tank are fixed with guide plates to guide suspended flocs.

[0011] Furthermore, the docking rotation mechanism includes a motor fixedly installed on the upper surface of the first electric slide, and a first gear disk that drives the first half gear and the second half gear to rotate is fixedly connected above the motor via a coupling. The end of the first half shaft is fixedly connected to the first half gear.

[0012] The end of the second half shaft is fixedly connected to the second half gear. A docking rod that is inserted into the docking hole is connected to one side of the second half gear. The docking hole is opened inside the first half gear. A connecting block that matches the size of the connecting groove is provided inside the first half shaft. The connecting groove is opened inside the second half shaft.

[0013] Furthermore, both ends of the first and second electric slides located outside the first and second half-shafts are fixed with collars, and the first and second half-shafts are movably connected to the collars.

[0014] Furthermore, an electric telescopic rod is installed on the upper end of the first electric carriage located on one side of the second half-shaft. The surface of the second half-shaft is provided with a positioning hole for limiting accidental rotation, and the positioning hole and the output end of the electric telescopic rod form a plug-in structure.

[0015] Furthermore, the swing mechanism includes a turntable mounted on the inner wall of the sedimentation tank via bearings. A second gear disk that drives the turntable to rotate is fixedly connected to one end of the turntable located outside the sedimentation tank. A round rod is fixed to the surface edge of the turntable. A swinging net rod that reciprocates and rotates is provided on one side of the turntable located inside the sedimentation tank. A strip groove is provided at the end of the swinging net rod for the round rod to slide.

[0016] Furthermore, a lifting rack that can move up and down and is shaped like a "7" is meshed on one side of the second gear disc. A fixed frame that forms a sliding sleeve structure with the lifting rack is installed on the outer wall of the sedimentation tank. A lifting frame that drives the lifting rack to move up and down is fixedly connected below the bidirectional electric guide rail. The lifting rack slides through the top edge of the sedimentation tank. A return spring is sleeved on the outer side of the lifting rack below the fixed frame.

[0017] Furthermore, the sedimentation tank is provided with a first rotating shaft and a second rotating shaft mounted on the inner walls on both sides of the swing mechanism. The opening and closing mechanism includes a first opening and closing gear plate fixedly sleeved on the outside of the first rotating shaft. The second opening and closing gear plate is fixedly sleeved on the outside of the second rotating shaft. The first opening and closing gear plate and the second opening and closing gear plate are meshing connection structures.

[0018] The outer sides of the No. 1 and No. 2 rotating shafts are connected to equally spaced opening and closing rods with triangular cross-sectional shapes for dispersing precipitates. One side of the No. 2 opening and closing toothed disc is meshed with an arc-shaped rack that drives the opening and closing rods to open or close, and the arc-shaped rack is connected to the bottom end of the swing net rod.

[0019] A rapid dewatering method for dredged sludge using a combination of flocculation and plate and frame filter press includes the following steps:

[0020] S1: The reaction and sedimentation process involves the flocculant and wastewater mixing in a sedimentation tank to react and settle. Lighter flocs float to the surface, while heavier sludge settles at the bottom of the tank.

[0021] S2: During the process of collecting suspended flocs, after a portion of the flocs are suspended on the water surface, the bidirectional electric guide rail is activated to drive the No. 1 electric slide and the No. 2 electric slide to approach each other, so that the docking and rotating mechanism docks and drives the No. 1 and No. 2 nets to move and rotate. The centrifugal force is used to throw off the water on the surface of the collected flocs, reducing the water content.

[0022] S3: During the water flow stirring process, the upper layer of water in the sedimentation tank is transported to the plate and frame filter press assembly through the conveying pipeline assembly for primary filter pressing. While the hydraulic push rod lifts the No. 1 and No. 2 scoop nets, the swing mechanism and opening and closing mechanism are driven to operate, which promotes water circulation, avoids the formation of dead zones in the water flow, thereby improving the mixing effect of the water body, promoting the sedimentation and degradation process, and preventing lighter impurities from adhering to heavier impurities and forming clumps.

[0023] S4: In the wastewater treatment process, after multiple scooping and agitation of the water flow, most of the suspended flocs are scooped out, while the heavier sludge remains at the bottom of the sedimentation tank. The water flow is filtered into mud cakes by the plate and frame filter press assembly and then discharged. The sludge is subsequently washed and cleaned.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The flocculation combined plate and frame filter press dredging sludge rapid dewatering device and dewatering method, the No. 1 and No. 2 scoop nets can move laterally to quickly collect the flocs floating on the water surface, and after the No. 1 and No. 2 scoop nets are connected, they are driven to rotate by the docking rotation mechanism to generate centrifugal force to throw out a large amount of water from the surface of the flocs, reduce the water content in the flocs, thereby reducing the overall sludge volume and the suspended solids in the sedimentation tank. It can treat impurities of different volumes in stages according to the size of the impurities, avoiding excessive algae impurities, which will affect the formation of the subsequent filter cake;

[0026] 2. The flocculation combined with plate and frame filter press dredging sludge rapid dewatering device and dewatering method, after the flocs suspended on the water surface are scooped out, the scooped flocs are lifted to separate them from the water surface. During the lifting and separation process, the swinging mechanism disturbs the water flow. Compared with the direct use of rotary stirring, the shearing force of the lateral swinging mechanism is smaller, which can gently accelerate the lifting efficiency of lighter flocs, reduce the sludge volume in the sedimentation tank, and improve the treatment efficiency of the plate and frame filter press assembly.

[0027] 3. The flocculation combined plate and frame filter press dredging sludge rapid dewatering device and dewatering method adopts a swing mechanism and an opening and closing mechanism operating synchronously. Through the reciprocating motion of horizontal and vertical swing, it can effectively break the laminar flow state of the water flow, promote the flow and disturbance of the fluid, break up the clumps of impurity particles, cause the lighter impurities to float and the heavier impurities to sink, reduce the dead zone in the sedimentation area, enhance the sedimentation effect of the sediment, improve the treatment capacity of the sedimentation tank, and prevent excessive sludge accumulation and the formation of a hard sludge layer. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of the sedimentation tank structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the bidirectional electric guide rail structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the first and second rotating shafts of the present invention;

[0032] Figure 5 This is a schematic diagram of the internal structure of the sedimentation tank of the present invention;

[0033] Figure 6 This is a three-dimensional structural diagram of the docking and rotating mechanism of the present invention;

[0034] Figure 7 This is a schematic diagram of the internal structure of the No. 1 fishing net of the present invention;

[0035] Figure 8 This is a schematic diagram of the guide plate structure of the present invention;

[0036] Figure 9 This is a schematic diagram of the second half-shaft structure of the present invention;

[0037] Figure 10 This is a schematic diagram of the positioning hole structure of the present invention;

[0038] Figure 11 This is a schematic diagram of the first half-shaft structure of the present invention;

[0039] Figure 12 This is a schematic diagram of the swinging net pole structure of the present invention;

[0040] Figure 13 This is a schematic diagram of the swing mechanism structure of the present invention;

[0041] Figure 14 This is a schematic diagram of the opening and closing mechanism of the present invention.

[0042] In the diagram: 1. Base; 2. Sedimentation tank; 3. Conveying pipeline assembly; 4. Plate and frame filter press assembly; 5. Docking and rotating mechanism; 501. Motor; 502. Gear disc No. 1; 503. Half gear No. 1; 504. Half gear No. 2; 6. Bidirectional electric guide rail; 7. Hydraulic push rod; 8. Swinging mechanism; 801. Gear disc No. 2; 802. Turntable; 803. Strip groove; 804. Round rod; 9. Swinging mesh rod; 10. Lifting rack; 11-a. Shaft No. 1; 11-b. Shaft No. 2; 12. Opening and closing mechanism; 1201. 1. No. 1 opening and closing gear plate; 1202. Arc-shaped rack; 1203. No. 2 opening and closing gear plate; 13. Opening and closing rod; 14. Fixing frame; 15. Return spring; 16-a. No. 1 electric slide; 16-b. No. 2 electric slide; 17-a. No. 1 half shaft; 17-b. No. 2 half shaft; 18-a. No. 1 scoop net; 18-b. No. 2 scoop net; 19. Lifting frame; 20. Docking hole; 21. Connecting block; 22. Guide plate; 23. Electric telescopic rod; 24. Docking rod; 25. Collar; 26. Connecting groove; 27. Positioning hole. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please see Figures 1-5 , Figure 7 and Figure 8This invention provides a technical solution: a rapid dewatering device for dredged sludge using a combined flocculation and plate and frame filter press, comprising a sedimentation tank 2 for settling sludge installed above a base 1, a plate and frame filter press assembly 4 for pressing filter cakes installed above one side of the base 1, a conveying pipeline assembly 3 for conveying and outputting sewage or clean water connected between the sedimentation tank 2 and the plate and frame filter press assembly 4, hydraulic push rods 7 for assisting in the lifting and lowering of bidirectional electric guide rails 6 fixedly installed at both ends of the surface of the sedimentation tank 2, and guide plates 22 for guiding suspended flocs fixed at both ends of the inner wall of the sedimentation tank 2, the suspended flocs moving upwards along the inclined surface of the guide plates 22 towards the water surface.

[0045] In practice, the wastewater mixed with flocculant is discharged into sedimentation tank 2 for reaction and sedimentation. The water level of the wastewater must not exceed the upper surface of the guide plate 22. Subsequently, the flocculants are suspended on the water surface, and the guide plate 22 guides the flocculants. After a large amount of sludge settles at the bottom of sedimentation tank 2, the pipeline conveying pipeline assembly 3 is started to transport the water in sedimentation tank 2 into plate and frame filter press assembly 4 for filter pressing, so that a small part of the sludge particles are pressed into sludge cakes for easy transportation.

[0046] See Figures 1-11 It is known that the first electric slide 16-a and the second electric slide 16-b are electrically slidably connected above the bidirectional electric guide rail 6. A docking rotation mechanism 5 for throwing out surface moisture of flocculants is installed above the first electric slide 16-a and the second electric slide 16-b. The first half shaft 17-a and the second half shaft 17-b respectively movably pass through the interior of the first electric slide 16-a and the second electric slide 16-b. The first half shaft 17-a and the second half shaft 17-b are connected to the docking rotation mechanism 5. The docking rotation mechanism 5 includes a motor 501 fixedly installed on the upper surface of the first electric slide 16-a.

[0047] Above the motor 501, a first gear disk 502 is fixedly connected via a coupling to drive the first half gear 503 and the second half gear 504 to rotate. The end of the first half shaft 17-a is fixedly connected to the first half gear 503, and the end of the second half shaft 17-b is fixedly connected to the second half gear 504. Both the first half gear 503 and the second half gear 504 form a meshing connection structure with the first gear disk 502.

[0048] In practice, during the process of scooping up suspended flocs on the water surface, the bidirectional electric guide rail 6 drives the first electric slide 16-a and the second electric slide 16-b to move closer to each other. When the adjacent sides of the first electric slide 16-a and the second electric slide 16-b are tightly fitted together, the first half gear 503 and the second half gear 504 are spliced ​​together, and the first half shaft 17-a and the second half shaft 17-b are spliced ​​together to form a complete transmission shaft. At the same time, the first net 18-a and the second net 18-b are in contact with each other, and then the motor 501 drives the first gear disk 502 to rotate.

[0049] Since both the first half gear 503 and the second half gear 504 mesh with the first gear disk 502, the first gear disk 502 drives the first half gear 503 and the second half gear 504 to rotate. The first half gear 503 and the second half gear 504 then drive the first half shaft 17-a and the second half shaft 17-b to rotate, which in turn drives the first net 18-a and the second net 18-b to rotate synchronously. After the suspended flocs on the water surface are retrieved, the centrifugal force generated by the rotation can be used to shake off the water on the surface of the flocs, thereby reducing the water content of the retrieved flocs.

[0050] See Figures 1-7 and Figures 9-11 It is known that the bottom end of the first half-shaft 17-a inside the sedimentation tank 2 is fixedly connected to the first net 18-a for retrieval of suspended flocs, and the bottom end of the second half-shaft 17-b inside the sedimentation tank 2 is fixedly connected to the second net 18-b for retrieval of suspended flocs. The first half-shaft 17-a and the second half-shaft 17-b drive the first net 18-a and the second net 18-b to rotate synchronously. The first electric slide 16-a and the second electric slide 16-b are both fixed with collars 25 at both ends outside the first half-shaft 17-a and the second half-shaft 17-b, and the first half-shaft 17-a and the second half-shaft 17-b are movably connected to the collars 25.

[0051] One side of the second half gear 504 is connected to a docking rod 24 that is inserted into the docking hole 20, and the docking hole 20 is opened inside the first half gear 503. The inner side of the first half shaft 17-a is provided with a connecting block 21 that matches the size of the connecting groove 26. The connecting groove 26 is opened inside the second half shaft 17-b. The connecting block 21 is inserted into the connecting groove 26 so that the first half shaft 17-a and the second half shaft 17-b fit tightly together.

[0052] In practice, when the No. 1 fishing net 18-a and the No. 2 fishing net 18-b are in contact, the No. 2 half gear 504 drives the docking rod 24 to insert into the docking hole 20, so that the No. 2 half gear 504 and the No. 1 half gear 503 are spliced ​​together, which can avoid offset. At the same time, the connecting block 21 is inserted into the connecting groove 26, so that the No. 1 half shaft 17-a and the No. 2 half shaft 17-b are tightly connected. When the No. 1 half shaft 17-a and the No. 2 half shaft 17-b are rotating, the collar 25 provides a stable sliding connection. The No. 1 fishing net 18-a and the No. 2 fishing net 18-b are set in an arc structure, which does not affect normal rotation. Combined with their lateral movement, they can quickly collect the flocs floating on the water surface and throw off a large amount of water from the surface of the flocs, avoiding the flocs having too high a water content, which would affect the conveying and processing.

[0053] See Figures 9-11 It can be seen that the electric slide 16-a is equipped with an electric telescopic rod 23 on the upper end of the side of the second half shaft 17-b. The surface of the second half shaft 17-b is provided with a positioning hole 27 for limiting accidental rotation, and the positioning hole 27 and the output end of the electric telescopic rod 23 form a plug-in structure.

[0054] In practice, when the second half-shaft 17-b moves laterally, to prevent accidental rotation of the second half-shaft 17-b, the electric telescopic rod 23 can be inserted into the positioning hole 27 to directly restrict the rotation of the second half-shaft 17-b and prevent displacement or loosening. When the second half-shaft 17-b needs to rotate, the electric telescopic rod 23 retracts and disengages from the positioning hole 27, so that the second half-shaft 17-b is no longer restricted by the electric telescopic rod 23, facilitating normal rotation of the second half-shaft 17-b.

[0055] See Figure 4 , Figure 5 , Figure 12 and Figure 13 It is known that a oscillating mechanism 8 for agitating water flow is installed on the inner wall of the middle part of the sedimentation tank 2. The oscillating mechanism 8 includes a turntable 802 installed on the inner wall of the sedimentation tank 2 via bearings. A second gear disc 801 for driving the turntable 802 to rotate is fixedly connected to one end of the turntable 802 located outside the sedimentation tank 2. A round rod 804 is fixed at the surface edge of the turntable 802. A oscillating net rod 9 for reciprocating oscillation is provided on one side of the turntable 802 located inside the sedimentation tank 2. A strip groove 803 is provided at the end of the oscillating net rod 9 for the round rod 804 to slide. The turntable 802 drives the round rod 804 to rotate, so that the round rod 804 slides in the strip groove 803 and pulls the oscillating net rod 9 to swing laterally.

[0056] A lifting rack 10, which can move up and down and is in the shape of a "7", is meshed on one side of the second gear disc 801. A fixed frame 14, which forms a sliding sleeve structure with the lifting rack 10, is installed on the outer wall of the sedimentation tank 2. A lifting frame 19, which drives the lifting rack 10 to rise and fall, is fixedly connected below the bidirectional electric guide rail 6. The lifting rack 10 slides through the top edge of the sedimentation tank 2. A return spring 15 is sleeved on the outer side of the lifting rack 10 below the fixed frame 14.

[0057] In practice, after the suspended flocs are removed, the water in the upper layer of the sedimentation tank 2 is pumped to the plate and frame filter press assembly 4 for treatment. Then, the No. 1 scoop net 18-a and the No. 2 scoop net 18-b need to be lifted to facilitate the quick and centralized treatment of the flocs by the staff. The bidirectional electric guide rail 6 can be pushed up by the hydraulic push rod 7, so that the No. 1 electric slide 16-a and the No. 2 electric slide 16-b can carry the No. 1 scoop net 18-a and the No. 2 scoop net 18-b to the outside of the sedimentation tank 2. At the same time as the bidirectional electric guide rail 6 rises, the lifting frame 19 also rises and squeezes and pushes the lifting rack 10 to rise. The lifting rack 10 slides inside the fixed frame 14 and the sedimentation tank 2 and squeezes the return spring 15.

[0058] During this process, the lifting rack 10 meshes with the second gear disc 801, causing the lifting rack 10 to drive the second gear disc 801 to rotate. The second gear disc 801 drives the turntable 802 to rotate synchronously. The turntable 802 drives the round rod 804 to rotate and slide in the strip groove 803, pulling the swing net rod 9 to perform reciprocating swing rotation. When suspended flocculents are being retrieved and raised, the swing net rod 9 can be automatically driven to run. The swing net rod 9 can promote water circulation, avoid the formation of dead zones in the water flow, thereby improving the mixing effect of the water body, promoting the sedimentation and degradation process, and preventing lighter impurities from adhering to heavier impurities and forming clumps, which is not conducive to the floating of lighter impurities and thus affects the retrieval efficiency.

[0059] See Figure 4 , Figure 5 , Figure 12 and Figure 14 It is known that the sedimentation tank 2 is provided with a first rotating shaft 11-a and a second rotating shaft 11-b mounted on the inner walls on both sides of the swing mechanism 8 via bearings. The outer sides of the first rotating shaft 11-a and the second rotating shaft 11-b are connected to an opening and closing mechanism 12 for breaking the aggregation state of sediment. The opening and closing mechanism 12 includes a first opening and closing toothed disc 1201 fixedly sleeved on the outer side of the first rotating shaft 11-a, and a second opening and closing toothed disc 1203 fixedly sleeved on the outer side of the second rotating shaft 11-b. The first opening and closing toothed disc 1201 and the second opening and closing toothed disc 1203 are meshing connections.

[0060] The outer sides of the first rotating shaft 11-a and the second rotating shaft 11-b are connected to opening and closing rods 13 with equal intervals for dispersing precipitates and with triangular cross-sections. The second opening and closing toothed disc 1203 is meshed with an arc-shaped toothed rack 1202 that drives the opening and closing rods 13 to open or close, and the arc-shaped toothed rack 1202 is connected to the bottom end of the swing net rod 9.

[0061] In specific implementation, while the swinging net rod 9 swings laterally back and forth, it drives the arc-shaped rack 1202 to swing left and right back and forth, causing the arc-shaped rack 1202 to mesh with the second opening and closing gear disc 1203, thus driving the second opening and closing gear disc 1203 to rotate. At the same time, the second opening and closing gear disc 1203 meshes with the first opening and closing gear disc 1201, causing the first opening and closing gear disc 1201 to rotate in the opposite direction to the second opening and closing gear disc 1203, thereby driving the first opening and closing gear disc 1201 to rotate in the opposite direction to the second opening and closing gear disc 1203. The rotation of shaft 11-a and shaft 11-b causes the opening and closing rods 13 of shaft 11-a and shaft 11-b to move closer or further apart. By opening or closing the opening and closing rods 13, clumps of impurities can be gently broken up, and lighter suspended flocs can be quickly floated to the surface. At the same time, it prevents excessive accumulation of sludge, which would form a hard sludge layer that is not conducive to cleaning. The cross-section of the opening and closing rod 13 is triangular, which can effectively reduce the resistance of water flow and make the water flow around the rod body more smoothly.

[0062] A rapid dewatering method for dredged sludge using a combination of flocculation and plate and frame filter press includes the following steps:

[0063] S1: The reaction and sedimentation process involves the flocculant and wastewater mixing in the sedimentation tank 2 to react and settle. The lighter flocs float to the surface of the water, while the heavier sludge settles at the bottom of the sedimentation tank 2.

[0064] S2: During the process of collecting suspended flocs, after a portion of the flocs are suspended on the water surface, the bidirectional electric guide rail 6 is activated to drive the first electric slide 16-a and the second electric slide 16-b to move closer to each other, so that the docking and rotating mechanism 5 docks and drives the first net 18-a and the second net 18-b to move and rotate. The centrifugal force is used to throw off the water on the surface of the collected flocs, reducing the water content.

[0065] S3: During the water flow stirring process, the upper layer water of the sedimentation tank 2 is transported to the plate and frame filter press assembly 4 through the conveying pipeline assembly 3 for primary filter press. While the hydraulic push rod 7 lifts the No. 1 scoop net 18-a and the No. 2 scoop net 18-b, the swing mechanism 8 and the opening and closing mechanism 12 are driven to run, which promotes the circulation of water flow, avoids the formation of dead zones in water flow, thereby improving the mixing effect of the water body, promoting the sedimentation and degradation process, and preventing lighter impurities from adhering to heavier impurities and forming clumps.

[0066] S4: In the residual water treatment process, after multiple scooping and stirring of the water flow, most of the suspended flocs are scooped out, while the heavier sludge remains at the bottom of the sedimentation tank 2. The water flow is filtered into mud cakes by the plate and frame filter press assembly 4 and discharged. The sludge is then washed and cleaned.

[0067] In summary, when using this flocculation combined plate and frame filter press dredging sludge rapid dewatering device and method, the flocculant and sewage mixture first react and settle in the sedimentation tank 2. The lighter flocs float to the surface, while the heavier sludge settles at the bottom. Once some flocs are suspended on the surface, the bidirectional electric guide rail 6 is activated, causing the first electric slide 16-a and the second electric slide 16-b to move closer together. This allows the docking and rotating mechanism 5 to dock and move and rotate the first and second scoop nets 18-a and 18-b. Centrifugal force is used to remove surface water from the scooped-up flocs, reducing the water content. The sludge can then be transported through the conveying pipe. The filter assembly 3 transports the upper layer water of the sedimentation tank to the plate and frame filter press assembly 4 for primary filtration. While the hydraulic push rod 7 lifts the first scoop net 18-a and the second scoop net 18-b, it can drive the swing mechanism 8 and the opening and closing mechanism 12 to operate, promote water circulation, avoid the formation of dead zones in the water flow, thereby improving the mixing effect of the water body and promoting the sedimentation and degradation process. After multiple scooping and stirring of the water flow, most of the suspended flocs are scooped out, while the heavier sludge remains at the bottom of the sedimentation tank 2. The water flow is filtered into mud cakes by the plate and frame filter press assembly 4 and discharged. The sludge can be subsequently washed and cleaned. The contents not described in detail in this description belong to the prior art known to those skilled in the art.

Claims

1. A device for rapid dewatering of dredged sludge by flocculation combined with plate-and-frame filter pressing, characterized in that: It includes a sedimentation tank (2) for settling sludge, which is installed above the base (1). Both ends of the surface of the sedimentation tank (2) are fixedly equipped with hydraulic push rods (7) to assist in lifting and lowering the bidirectional electric guide rail (6). The bidirectional electric guide rail (6) is electrically controlled to slide a first electric slide (16-a) and a second electric slide (16-b) above it. The first electric slide (16-a) and the second electric slide (16-b) are respectively movably connected to a first half shaft (17-a) and a second half shaft (17-b). The first half shaft (17-a) and the second half shaft (17-b) are connected to a docking rotation mechanism (5). The docking rotation mechanism (5) for throwing out surface moisture of flocculants is installed above the first electric slide (16-a) and the second electric slide (16-b). The bottom ends of the first half-shaft (17-a) and the second half-shaft (17-b) inside the sedimentation tank (2) are respectively fixedly connected to the first scoop net (18-a) and the second scoop net (18-b) for scooping suspended flocs. The inner wall of the middle part of the sedimentation tank (2) is equipped with a swing mechanism (8) for stirring water flow. The inner walls on both sides of the sedimentation tank (2) are provided with the first rotating shaft (11-a) and the second rotating shaft (11-b) installed by bearings. The opening and closing mechanism (12) includes a first opening and closing gear disc (1201) fixedly sleeved on the outside of the first rotating shaft (11-a). The outer side of the second rotating shaft (11-b) is fixedly sleeved with a second opening and closing gear disc. The toothed disc (1203) and the first opening and closing toothed disc (1201) and the second opening and closing toothed disc (1203) are meshing connection structures. The outer sides of the first rotating shaft (11-a) and the second rotating shaft (11-b) are connected with equally spaced opening and closing rods (13) with triangular cross-sections for dispersing precipitates. The second opening and closing toothed disc (1203) is meshed with an arc-shaped rack (1202) that drives the opening and closing rods (13) to open or close. The arc-shaped rack (1202) is connected to the bottom end of the swing net rod (9). The outer sides of the first rotating shaft (11-a) and the second rotating shaft (11-b) are connected with an opening and closing mechanism (12) that breaks the aggregation state of precipitates. The docking rotation mechanism (5), the No. 1 scoop net (18-a) and the No. 2 scoop net (18-b) work together to scoop up suspended flocs and rotate to throw off surface water. The No. 1 scoop net (18-a) and the No. 2 scoop net (18-b) rise and drive the swing mechanism (8) and the opening and closing mechanism (12) to run synchronously, stirring the water flow horizontally and vertically. The docking rotation mechanism (5) includes a motor (501) fixedly installed on the upper surface of the first electric slide (16-a). Above the motor (501) is a first gear disk (502) that drives the first half gear (503) and the second half gear (504) to rotate, which is fixedly connected by a coupling. The end of the first half shaft (17-a) is fixedly connected to the first half gear (503). The end of the second half shaft (17-b) is fixedly connected to the second half gear (504). A docking rod (24) that is inserted into the docking hole (20) is connected to one side of the second half gear (504). The docking hole (20) is opened inside the first half gear (503). The first half shaft (17-a) is provided with a connecting block (21) that is adapted to the size of the connecting groove (26). The connecting groove (26) is opened inside the second half shaft (17-b). The swing mechanism (8) includes a turntable (802) mounted on the inner wall of the sedimentation tank (2) via bearings. A second gear disc (801) for driving the turntable (802) to rotate is fixedly connected to one end of the turntable (802) located outside the sedimentation tank (2). A round rod (804) is fixed at the surface edge of the turntable (802). A swing net rod (9) for reciprocating swing rotation is provided on one side of the turntable (802) located inside the sedimentation tank (2). A strip groove (803) for the round rod (804) to slide is provided at the end of the swing net rod (9). The second gear disc (801) is meshed with a lifting rack (10) that can move up and down and is in the shape of a "7". The outer wall of the sedimentation tank (2) is equipped with a fixed frame (14) that forms a sliding sleeve structure with the lifting rack (10). The bidirectional electric guide rail (6) is fixedly connected to a lifting frame (19) that drives the lifting rack (10) to rise and fall. The lifting rack (10) slides through the top edge of the sedimentation tank (2). The outside of the lifting rack (10) located below the fixed frame (14) is fitted with a return spring (15).

2. The flocculation combined plate-and-frame pressure filtration quick dewatering device for dredged sludge according to claim 1, characterized in that: The base (1) is located above the sedimentation tank (2) on one side and is equipped with a plate and frame filter press assembly (4) for pressing filter cake. The sedimentation tank (2) and the plate and frame filter press assembly (4) are connected by a conveying pipeline assembly (3) for conveying and outputting sewage or clean water. Both ends of the inner wall of the sedimentation tank (2) are fixed with guide plates (22) to guide suspended flocs.

3. The rapid dewatering device for flocculation combined with plate and frame filter press dredging of sludge according to claim 1, characterized in that: The first electric slide (16-a) and the second electric slide (16-b) are both fixed with collars (25) at both ends outside the first half shaft (17-a) and the second half shaft (17-b), and the first half shaft (17-a) and the second half shaft (17-b) are movably connected to the collars (25).

4. The rapid dewatering device for flocculation combined with plate and frame filter press dredging of sludge according to claim 3, characterized in that: The first electric slide (16-a) is equipped with an electric telescopic rod (23) on the upper end of the second half shaft (17-b) on one side. The surface of the second half shaft (17-b) is provided with a positioning hole (27) for limiting accidental rotation, and the positioning hole (27) and the output end of the electric telescopic rod (23) form a plug-in structure.

5. A method for rapid dewatering of dredged sludge using a combined flocculation and plate-and-frame filter press, employing the rapid dewatering device for dredged sludge using a combined flocculation and plate-and-frame filter press as described in claim 4, characterized in that... Includes the following steps: S1: The reaction and sedimentation process is carried out in the sedimentation tank (2) where the flocculant and sewage are mixed. The lighter flocculents float to the water surface, while the heavier sludge settles at the bottom of the sedimentation tank (2). S2: During the process of collecting suspended flocs, when a portion of the flocs are suspended on the water surface, the bidirectional electric guide rail (6) is activated to drive the No. 1 electric slide (16-a) and the No. 2 electric slide (16-b) to approach each other, so that the docking and rotating mechanism (5) docks and drives the No. 1 net (18-a) and the No. 2 net (18-b) to move and rotate. The centrifugal force is used to throw off the water on the surface of the collected flocs, reduce the water content, and reduce the overall sludge volume. S3: During the process of stirring the water flow, the upper layer of water in the sedimentation tank (2) can be transported to the plate and frame filter press assembly (4) through the conveying pipeline assembly (3) for primary filter press. While the hydraulic push rod (7) lifts the No. 1 fishing net (18-a) and the No. 2 fishing net (18-b), the swing mechanism (8) and the opening and closing mechanism (12) can be driven to run, promote the circulation of water flow, avoid the formation of dead zones in water flow, thereby improve the mixing effect of the water body, promote the sedimentation and degradation process, and prevent lighter impurities from adhering to heavier impurities and forming clumps. S4: During the wastewater treatment process, after multiple scooping and stirring of the water flow, most of the suspended flocs are scooped out, while the heavier sludge remains at the bottom of the sedimentation tank (2). The water flow is filtered into mud cakes by the plate and frame filter press assembly (4) and discharged. The sludge can be washed and cleaned later.

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