Landfill leachate pretreatment device

Abstract

The invention discloses a landfill leachate pretreatment device which comprises a filter box, the lower end of the filter box is connected with a conveying mechanism, one side of the filter box is provided with a protection box, a traction mechanism is arranged in the protection box, one end of the traction mechanism is connected with a filter barrel, and the filter barrel is located in the filter box. One end of the filter barrel is connected with a buffer mechanism, the upper end of the filter box is provided with a conical separation barrel, the two sides of the upper end of the conical separation barrel are provided with lifting mechanisms, the lifting mechanisms are provided with dispersing agent spraying mechanisms, the lower end of the conical separation barrel is connected with a spraying mechanism, and the spraying mechanism corresponds to the filter barrel. According to the invention, colloidal pollutants can be effectively decomposed, micron-sized suspended matters are reduced, the problem of suspended matters and metal residues is solved, the problem that a static filtering device is easy to scale is avoided, the frequency of manual cleaning is reduced, the frequency of shutdown for cleaning filter residues is reduced, the continuous operation of the device is ensured, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landfill leachate pretreatment, and particularly relates to a landfill leachate pretreatment device. BACKGROUND

[0002] In the process of treating landfill leachate, it is necessary to filter and collect the landfill leachate in advance. However, the current treatment device has the following problems due to its simple structure. 1. Suspended solids and metal residues: the traditional pretreatment device (such as a filter tank and a sediment tank) has low interception efficiency for micron-sized suspended solids and metal ions, which easily leads to clogging of a subsequent membrane system (DTRO membrane pollution problem); 2. Inhomogeneous mixing of reagents: chemical pretreatment causes secondary pollution due to excessive or uneven addition of reagents; 3. Insufficient dynamic separation: a static filtration device is prone to scaling and needs to be cleaned frequently by hand; 4. Low filtration efficiency: a single-layer fixed filter screen is prone to clogging, which limits the treatment capacity; 5. High maintenance cost: the device needs to be frequently stopped for cleaning of filter residues, which affects continuous operation.

[0003] Therefore, the present application provides a landfill leachate pretreatment device to solve the above problems. SUMMARY

[0004] The present application aims to solve the problems in the prior art and provides a landfill leachate pretreatment device.

[0005] To achieve the above object, the present application adopts the following technical scheme. The present application provides a landfill leachate pretreatment device, which comprises a filter tank, a connecting joint connected to the lower end of the filter tank, an output pipe connected to one end of the connecting joint, a protection tank installed on one side of the filter tank, a traction mechanism arranged in the protection tank, a filter barrel connected to one end of the traction mechanism and located in the filter tank, a buffer mechanism connected to one end of the filter barrel, a conical separation barrel installed on the upper end of the filter tank, lifting mechanisms installed on both sides of the upper end of the conical separation barrel, a dispersant spraying mechanism installed on the lifting mechanisms, a jetting mechanism connected to the lower end of the conical separation barrel and corresponding to the filter barrel, and a magnetic separation mechanism arranged in the conical separation barrel.

[0006] Preferably, the conveying mechanism comprises a connecting joint connected to the lower end of the filter tank, and the connecting joint is connected to an output pipe at one end.

[0007] Preferably, the traction mechanism comprises a drive motor mounted on one side in the protection box, the output shaft of the drive motor is connected with a rotating disc, one side of the rotating disc is rotatably connected with a rotating rod, one end of the rotating rod is rotatably connected with a moving plate, both sides of the moving plate are fixedly connected with sliding blocks, opposite side walls in the protection box are both provided with sliding grooves, one sliding block on the same side is mounted in one sliding groove on the same side, one end of the moving plate is fixedly connected with a pull rod, the pull rod penetrates through the side walls of the protection box and the filter box and is fixed on one side of the filter barrel.

[0008] Preferably, the buffer mechanism comprises two guide rods fixed on the other side of the filter barrel, springs are sleeved on the guide rods, one side of the upper end of the filter box is fixedly connected with a fixed plate, the two guide rods penetrate through the fixed plate and extend to one side of the fixed plate, and one end of the spring abuts against one side of the fixed plate.

[0009] Preferably, the lifting mechanism comprises a fixed ring fixed on a circumferential side wall of the conical separation barrel, hydraulic cylinders are fixedly connected with both sides of the upper end of the fixed ring, the piston rods of the two hydraulic cylinders are fixedly connected with a top plate at the tail ends, a closing plate is fixedly connected with the middle of the lower end of the top plate, and the upper end of the conical separation barrel is provided with an opening corresponding to the closing plate.

[0010] Preferably, the dispersant spraying mechanism comprises a spray pipe fixedly connected with the middle of the lower end of the closing plate, a plurality of spray holes are equidistantly arranged on a circumferential side wall of the spray pipe, a dispersant storage tank is arranged on one side of the filter box, a conveying pump is mounted on one side of the dispersant storage tank, a dispersant conveying pipe is connected with the conveying pump, and one end of the dispersant conveying pipe penetrates through the side wall of the top plate and is connected with the upper end of the spray pipe.

[0011] Preferably, the spraying mechanism comprises a connecting pipe connected with the bottom of the conical separation barrel, and a Venturi nozzle is connected with both sides of the lower end of the connecting pipe and corresponds to the filter barrel.

[0012] Preferably, the magnetic separation mechanism comprises helical flow guides fixedly connected with a circumferential side wall in the conical separation barrel, a plurality of adsorption magnetic blocks are arranged in a staggered manner between the helical flow guides, and the adsorption magnetic blocks are arranged in pairs, and one end of the adsorption magnetic block is fixed on one end of the side wall in the conical separation barrel.

[0013] Preferably, one side of the upper end of the conical separation barrel is connected with a liquid inlet pipe, the lower end of the conical separation barrel is connected with a support frame, and the lower end of the support frame is fixed on the upper end of the filter box.

[0014] Preferably, a sealing door is hingedly connected on one side of the filter box, a cover is hingedly connected on one side of the filter barrel, and the cover corresponds to the sealing door.

[0015] In the present application, the processing step is: S1, leachate introduction and preliminary treatment: the landfill leachate enters the conical separation barrel through the inlet pipe and rotates downward under the guidance of the spiral guide plate. At the same time, the biological dispersant in the dispersant storage tank is continuously released into the leachate through the spray pipe and the spray hole by the spray pipe and the spray hole, and the colloidal pollutants are decomposed; S2, magnetic adsorption separation: in the conical separation barrel, metal particles are adsorbed on the surface of the magnetic block in the gradient magnetic field formed by the magnetic block, realizing the separation of metal particles and leachate, and the separation efficiency is greater than 85%; S3, atomization injection: after the preliminary treatment and magnetic adsorption separation, the guide liquid flows to the venturi nozzle through the connecting pipe, forms a turbulent flow through the venturi nozzle, and breaks the residual floc; S4, dynamic filtration: the driving motor drives the rotating disc to rotate, the moving plate moves reciprocatingly under the cooperation of the sliding block and the sliding groove through the rotating rod, and then the filter barrel moves with an amplitude of 5-10 cm and a frequency of 2 Hz through the pull rod. The leachate sprayed from the spraying mechanism enters the filter barrel for filtration, realizing high retention rate, and the SS removal rate is greater than 92%, and preventing the filter barrel from being blocked; S5, filtered liquid output: the filtered liquid is discharged through the joint and the output pipe; S6, maintenance and cleaning: when it is necessary to clean the filter residue in the filter barrel, the sealing door and the cover can be opened for cleaning.

[0016] The present application has the following advantages: 1. The cooperation of the spiral guide plate and the biological dispersant can effectively decompose colloidal pollutants and reduce micron-level suspended solids; 2. The magnetic adsorption separation of the adsorption magnetic block can efficiently remove metal ions, improve the retention efficiency of metal ions, prevent the subsequent membrane system from being blocked, and reduce the risk of membrane pollution; 3. The uniform spraying of the biological dispersant through the spray pipe and the spray hole avoids the problems of excessive dosage or uneven distribution of chemicals in chemical pretreatment, and reduces secondary pollution; 4. The swinging dynamic filtration of the filter barrel avoids the scaling problem of static filtration devices and reduces the frequency of manual cleaning; 5. The dynamic filtration mode of the swinging filter barrel realizes high retention rate, improves filtration efficiency, solves the problem of limited treatment capacity caused by easy blocking of single-layer fixed filter screen, effectively prevents the filter barrel from being blocked, reduces the frequency of cleaning filter residue, ensures continuous operation of the device, and reduces maintenance cost; In summary, the present application can effectively decompose colloidal pollutants, reduce micron-level suspended solids, solve the problems of suspended solids and metal residues, avoid the scaling problem of static filtration devices, reduce the frequency of manual cleaning, reduce the frequency of cleaning filter residue, ensure continuous operation of the device, and reduce maintenance cost. Attached Figure Description

[0017] Figure 1 This is a diagram showing the open structure of the closed plate of the present invention; Figure 2 This is a structural diagram of the present invention; Figure 3 This is a structural diagram showing the connection between the lifting mechanism and the dispersant spraying mechanism of the present invention; Figure 4 This is a structural diagram showing the connection between the traction mechanism and the filter barrel of the present invention; Figure 5 This is a structural diagram of the filter barrel of the present invention; Figure 6 This is a structural diagram of the adsorption magnetic block of the present invention.

[0018] In the diagram: 1. Dispersant delivery pipe, 2. Inlet pipe, 3. Top plate, 4. Sealing plate, 5. Adsorption magnetic block, 6. Spray nozzle, 7. Spiral guide plate, 8. Hydraulic cylinder, 9. Fixing ring, 10. Support frame, 11. Filter box, 12. Protective box, 13. Sealing door, 14. Output pipe, 15. Connector, 16. Dispersant storage tank, 17. Conical separation tank, 18. Spray hole, 19. Filter box, 20. Cover, 21. Fixing plate, 22. Guide rod, 23. Spring, 24. Connecting pipe, 25. Venturi nozzle, 26. Pull rod, 27. Slide groove, 28. Moving plate, 29. Rotating rod, 30. Turntable, 31. Slider. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Reference Figures 1-6 A landfill leachate pretreatment device includes a filter box 11, a conveying mechanism connected to the lower end of the filter box 11, a protective box 12 installed on one side of the filter box 11, a traction mechanism installed inside the protective box 12, a filter bucket 19 connected to one end of the traction mechanism and located inside the filter box 11, a buffer mechanism connected to one end of the filter bucket 19, a conical separation bucket 17 installed at the upper end of the filter box 11, lifting mechanisms installed on both sides of the upper end of the conical separation bucket 17, a dispersant spraying mechanism installed on the lifting mechanism, a spraying mechanism connected to the lower end of the conical separation bucket 17 and corresponding to the filter bucket 19, and a magnetic separation mechanism installed inside the conical separation bucket 17. Through the coordinated work of each mechanism and reasonable processing steps, the landfill leachate can be effectively pretreated, improving the treatment efficiency and quality, while facilitating the maintenance and management of the device. The conveying mechanism comprises a joint 15 connected to the lower end of the filter box 11, one end of the joint 15 being connected with an output pipe 14, the joint 15 serving to connect the filter box 11 and the output pipe 14 and ensuring that the filtered liquid can be smoothly discharged from the filter box 11 to the outside of the device; The traction mechanism comprises a driving motor installed on one side in the protection box 12, the output shaft of the driving motor being connected with a rotating disc 30 at the end, one side of the rotating disc 30 being rotatably connected with a rotating rod 29, one end of the rotating rod 29 being rotatably connected with a moving plate 28, both sides of the moving plate 28 being fixedly provided with sliding blocks 31, opposite side walls in the protection box 12 being provided with sliding grooves 27, one sliding block 31 on the same side being installed in one sliding groove 27 on the same side, one end of the moving plate 28 being fixedly provided with a pull rod 26, the pull rod 26 penetrating through the side walls of the protection box 12 and the filter box 11 and being fixedly provided on one side of the filter barrel 19, the output shaft of the driving motor driving the rotating disc 30 to rotate, the rotation of the rotating disc 30 being converted into the linear motion of the moving plate 28 through the rotating rod 29. The sliding blocks 31 on both sides of the moving plate 28 slide in the sliding grooves 27 on the opposite side walls of the protection box 12, ensuring the stability of the motion of the moving plate 28. The pull rod 26 transmits the motion of the moving plate 28 to the filter barrel 19, so that the filter barrel 19 can move in a preset manner; The buffer mechanism comprises two guide rods 22 fixedly provided on the other side of the filter barrel 19, springs 23 being sleeved on the guide rods 22, a fixed plate 21 being fixedly provided on one side of the upper end of the filter box 11, the two guide rods 22 penetrating through the fixed plate 21 and extending to one side of the fixed plate 21, one end of the spring 23 abutting against one side of the fixed plate 21, when the filter barrel 19 moves, the guide rods 22 slide on the fixed plate 21, the spring 23 serving to buffer and reduce the impact force generated when the filter barrel 19 moves, protecting the structural stability of the device; The lifting mechanism comprises a fixed ring 9 fixedly provided on the side wall of the conical separation barrel 17, hydraulic cylinders 8 being fixedly provided on both sides of the upper end of the fixed ring 9, the piston rods of the two hydraulic cylinders 8 being commonly fixedly provided with a top plate 3, the lower end of the top plate 3 being fixedly provided with a closing plate 4, the upper end of the conical separation barrel 17 being provided with an opening, the closing plate 4 corresponding to the opening, the piston rods of the hydraulic cylinders 8 being capable of driving the top plate 3 and the closing plate 4 to move up and down, the closing plate 4 corresponding to the opening on the upper end of the conical separation barrel 17, the opening being capable of being closed or opened, facilitating the maintenance and cleaning of the device; The dispersant spraying mechanism comprises a spray pipe 6 fixedly provided on the middle of the lower end of the closing plate 4, a plurality of spray holes 18 being equidistantly provided on the side wall of the spray pipe 6, a dispersant storage tank 16 being provided on one side of the filter box 11, a conveying pump being installed on one side of the dispersant storage tank 16, a dispersant conveying pipe 1 being connected to the conveying pump, one end of the dispersant conveying pipe 1 penetrating through the side wall of the top plate 3 and being connected to the upper end of the spray pipe 6, the conveying pump conveying the biological dispersant in the dispersant storage tank 16 to the spray pipe 6 through the dispersant conveying pipe 1, and then spraying the biological dispersant uniformly to the leachate through the spray holes 18, so as to decompose the colloidal pollutants in the leachate. The spraying mechanism comprises a connecting pipe 24 connected to the bottom of the conical separation barrel 17, and the lower end of the connecting pipe 24 is connected with a Venturi nozzle 25 on both sides, and the Venturi nozzle 25 corresponds to the filter barrel 19. The flow guide liquid after the preliminary treatment and the magnetic adsorption separation flows to the Venturi nozzle 25 through the connecting pipe 24, and the Venturi nozzle 25 accelerates the liquid flow by using the special structure to form a turbulent flow, which can effectively break the residual floc; The magnetic adsorption separation mechanism comprises spiral flow guide plates 7 fixed at equal intervals on one side wall in the conical separation barrel 17, and a plurality of adsorption magnetic blocks 5 are arranged between the spiral flow guide plates 7 in a staggered manner, and the adsorption magnetic blocks 5 are arranged in pairs. One end of the adsorption magnetic block 5 is fixed to one end of the side wall in the conical separation barrel 17. In the process of the leachate rotating downward along the spiral flow guide plate 7, the metal particles are adsorbed to the surface of the magnetic block in the gradient magnetic field formed by the adsorption magnetic block 5, so as to realize the separation of the metal particles and the leachate. The upper end of the conical separation barrel 17 is connected with a liquid inlet pipe 2, and the lower end of the conical separation barrel 17 is connected with a support frame 10, and the lower end of the support frame 10 is fixed to the upper end of a filter box 11. A sealing door 13 is hinged to one side of the filter box 11, and a cover 20 is hinged to one side of the filter barrel 19. The cover 20 corresponds to the sealing door 13, so as to facilitate the regular maintenance and cleaning.

[0021] In the present application, the processing steps are as follows: S1, leachate introduction and preliminary treatment: the landfill leachate enters the conical separation barrel 17 through the liquid inlet pipe 2 and rotates downward under the guidance of the spiral flow guide plate 7. At the same time, the biological dispersant in the dispersant storage tank 16 enters the spray pipe 6 through the delivery pump and the dispersant delivery pipe 1, and is continuously released into the leachate through the spray hole 18 to decompose the colloidal pollutants; S2, magnetic adsorption separation: in the conical separation barrel 17, the metal particles are adsorbed to the surface of the magnetic block in the gradient magnetic field formed by the adsorption magnetic block 5, so as to realize the separation of the metal particles and the leachate, and the separation efficiency is greater than 85%; S3, atomization spraying: the flow guide liquid after the preliminary treatment and the magnetic adsorption separation flows to the Venturi nozzle 25 through the connecting pipe 24, and the turbulent flow is formed by the Venturi nozzle to break the residual floc; S4, dynamic filtration: the driving motor drives the rotating disc 30 to rotate, and the moving plate 28 moves back and forth under the cooperation of the sliding block 31 and the sliding groove 27 through the rotating rod 29, and then the filter barrel 19 moves with an amplitude of 5-10 cm and a frequency of 2 Hz through the pull rod 26. The leachate sprayed from the spraying mechanism enters the filter barrel 19 for filtration, realizes high retention rate, and the SS removal rate is greater than 92%, and prevents the filter barrel from being blocked; S5, output of the filtered liquid: the filtered liquid is discharged through the joint 15 and the output pipe 14; S6, maintenance and cleaning: when the filter residue in the filter bucket 19 needs to be cleaned, the sealing door 13 and the cover 20 are opened to clean.

[0022] The above merely illustrates the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacements or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A landfill leachate pretreatment device, comprising a filter box (11), characterized in that, The lower end of the filter box (11) is connected to a conveying mechanism. A protective box (12) is installed on one side of the filter box (11). A traction mechanism is provided inside the protective box (12). One end of the traction mechanism is connected to a filter barrel (19), and the filter barrel (19) is located inside the filter box (11). One end of the filter barrel (19) is connected to a buffer mechanism. A conical separation barrel (17) is installed at the upper end of the filter box (11). Lifting mechanisms are installed on both sides of the upper end of the conical separation barrel (17). A dispersant spraying mechanism is installed on the lifting mechanism. A spraying mechanism is connected at the lower end of the conical separation barrel (17), and the spraying mechanism corresponds to the filter barrel (19). A magnetic separation mechanism is provided inside the conical separation barrel (17).

2. The landfill leachate pretreatment device according to claim 1, characterized in that: The conveying mechanism includes a connector (15) connected to the lower end of the filter box (11), and one end of the connector (15) is connected to an output pipe (14).

3. The landfill leachate pretreatment device according to claim 1, characterized in that: The traction mechanism includes a drive motor installed on one side inside the protective box (12). The output shaft of the drive motor is connected to a turntable (30). A rotating rod (29) is rotatably connected to one side of the turntable (30). A movable plate (28) is rotatably connected to one end of the rotating rod (29). Slider blocks (31) are fixed on both sides of the movable plate (28). Slide grooves (27) are provided on opposite side walls inside the protective box (12). A slider (31) on the same side is installed in a slide groove (27) on the same side. A pull rod (26) is fixed to one end of the movable plate (28). The pull rod (26) passes through the side walls of the protective box (12) and the filter box (11) and is fixed to one side of the filter barrel (19).

4. The landfill leachate pretreatment device according to claim 1, characterized in that: The buffer mechanism includes two guide rods (22) fixed on the other side of the filter barrel (19), and a spring (23) is sleeved on the guide rods (22). A fixing plate (21) is fixed on one side of the upper end of the filter box (11). The two guide rods (22) pass through the fixing plate (21) and extend to one side of the fixing plate (21). One end of the spring (23) abuts against one side of the fixing plate (21).

5. A landfill leachate pretreatment device according to claim 4, characterized in that: The lifting mechanism includes a fixing ring (9) fixed on the side wall of the conical separation barrel (17). Hydraulic cylinders (8) are fixed on both sides of the upper end of the fixing ring (9). The piston rods of the two hydraulic cylinders (8) are fixed together with a top plate (3). A sealing plate (4) is fixed in the middle of the lower end of the top plate (3). The upper end of the conical separation barrel (17) has an opening, and the sealing plate (4) corresponds to the opening.

6. The landfill leachate pretreatment device according to claim 1, characterized in that: The dispersant spraying mechanism includes a spray pipe (6) fixed at the middle of the lower end of the closed plate (4). Multiple spray holes (18) are provided at equal intervals on the side wall of the spray pipe (6). A dispersant storage tank (16) is provided on one side of the filter box (11). A delivery pump is installed on one side of the dispersant storage tank (16). A dispersant delivery pipe (1) is connected to the delivery pump. One end of the dispersant delivery pipe (1) passes through the side wall of the top plate (3) and is connected to the upper end of the spray pipe (6).

7. A landfill leachate pretreatment device according to claim 6, characterized in that: The spraying mechanism includes a connecting pipe (24) connected to the bottom of the conical separation tank (17), and Venturi nozzles (25) are connected to both sides of the lower end of the connecting pipe (24), and the Venturi nozzles (25) correspond to the filter tank (19).

8. The landfill leachate pretreatment device according to claim 1, characterized in that: The magnetic separation mechanism includes spiral guide plates (7) that are fixed at equal intervals on the inner side wall of the conical separation barrel (17). Multiple magnetic adsorption blocks (5) are staggered between the spiral guide plates (7), and the magnetic adsorption blocks (5) are arranged in pairs. One end of the magnetic adsorption block (5) is fixed on one side wall inside the conical separation barrel (17).

9. A landfill leachate pretreatment device according to claim 1, characterized in that: The upper end of the conical separation tank (17) is connected to an inlet pipe (2), and the lower end of the conical separation tank (17) is connected to a support frame (10). The lower end of the support frame (10) is fixed to the upper end of the filter box (11).

10. A landfill leachate pretreatment device according to claim 1, characterized in that: A sealing door (13) is hinged to one side of the filter box (11), and a cover (20) is hinged to one side of the filter barrel (19). The cover (20) and the sealing door (13) correspond to each other.

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