Low-temperature step-by-step freeze concentration device and method for landfill leachate

Abstract

The invention discloses a landfill leachate low-temperature step-by-step freeze concentration device and method, and particularly relates to the technical field of garbage treatment.The landfill leachate low-temperature step-by-step freeze concentration device comprises a centrifugal separation box, a centrifugal separation barrel rotates clockwise, and a positioning shaft rotates anticlockwise; at the moment, the percolate entering the centrifugal separation barrel is driven by a plurality of slow flow guide plates to be pushed anticlockwise, so that the percolate has clockwise and anticlockwise liquid vortexes in the centrifugal separation barrel, and the percolate slowly passes through meshes in the surface of the centrifugal separation barrel to be separated; meanwhile, due to the fact that the two ends of the slow-flow guide plate are trapezoidal and the wall face of the slow-flow guide plate is arc-shaped, the slow-flow guide plate can guide and collect the crystallized ice crystals in the leachate when rotating, and therefore the effect that when the ice crystals in the leachate are centrifugally separated, the ice crystals in the leachate can be separated conveniently is achieved. And the collision and breakage phenomena are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of garbage disposal, and in particular to a low-temperature step-by-step freezing and concentration device and method for garbage leachate. Background Art

[0002] Lakes in arid regions face numerous unique challenges in hydrology, water environment, and aquatic ecology due to their dry, cold climate, high evaporation rates, and ice-covered periods of up to 4-6 months. These conditions create a fragile ecosystem and water shortages. In lake management, landfill leachate, a highly concentrated organic wastewater, can exacerbate eutrophication and heavy metal pollution if it enters the water directly. Nitrogen, phosphorus, organic matter, and heavy metals in leachate migrate and transform across the ice-water interface, exacerbating eutrophication during the ice-covered period.

[0003] At present, there are few special technical studies on leachate from lakes in cold and arid areas. The existing leachate treatment method is generally carried out by a low-temperature step-by-step freeze concentration method. Its main means is to separate water and pollutants through the phase change principle. However, when the leachate is subjected to freeze concentration treatment, the water in the leachate is generally frozen and crystallized into ice crystals, and then the ice crystals are separated from the leachate by separation means. The common ice crystal separation method generally uses centrifugal separation, and then the ice crystals inside the separation cylinder will continuously collide with the surface of the separation cylinder under the action of centrifugal force. At this time, the ice crystals are prone to breakage, resulting in the refinement of the ice crystals being discharged together with the leachate, which will affect the efficiency of ice crystal separation. For this reason, a low-temperature step-by-step freeze concentration device and method for leachate are proposed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a low-temperature step-by-step freezing concentration device and method for landfill leachate to solve the problems raised in the above background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: The landfill leachate low-temperature step-by-step freezing concentration device comprises a centrifugal separation box, a static crystallization box is fixedly installed on the top surface of the centrifugal separation box, and an impurity filter box is fixedly installed on the top surface of the static crystallization box; The semiconductor refrigeration plates are fixedly installed on both sides of the centrifugal separation box and the static crystallization box, respectively, and the centrifugal separation cylinder is rotatably connected to the interior of the centrifugal separation box, and the outer circumferential wall of the centrifugal separation cylinder is fixedly sleeved with a first gear ring, a mounting cover is fixedly installed on one side of the centrifugal separation box, and a first motor is fixedly installed on one side of the mounting cover, and a receiving shaft is fixedly installed on one end of the first motor driving shaft, and the receiving shaft passes through and extends into the interior of the centrifugal separation box, and one end of the receiving shaft is fixedly installed with a second driving gear, and the second driving gear is meshed with the first gear ring, and the outer circumferential wall of the receiving shaft is fixedly sleeved with the first driving gear, a feed hole is provided on one side of the centrifugal separation box, and a discharge hole is provided on the other side of the centrifugal separation box, and mounting brackets are fixedly installed inside the feed hole and the discharge hole, and a positioning shaft is rotatably connected between the two mounting brackets; The outer circular wall surface of the positioning shaft is fixedly sleeved with a positioning frame, and a plurality of slow-flow guide plates are fixedly installed on one side of the positioning frame. The inner circular wall surface of the centrifugal separation cylinder is rotatably connected with a connecting ring, and the inner circular wall surface of the connecting ring is fixedly installed with the slow-flow guide plate. The inner circular wall surface of the feed hole is fixedly sleeved with a sealing cap, and the positioning shaft passes through the outside of the sealing cap. The outer circular wall surface of the positioning shaft is fixedly sleeved with a first driven gear, and the first driven gear is meshed with the first driving gear. The bottom surface of the centrifugal separation box is fixedly installed with a second drain pipe.

[0006] By adopting the above technical solution, the leachate after freezing and crystallization is input into the interior of the centrifugal separation box, and then the leachate will directly enter the interior of the centrifugal separation cylinder, and then the first motor will cause the first driving gear and the second driving gear to rotate simultaneously. At this time, the second driving gear will rotate clockwise, and the first driving gear will rotate counterclockwise, thereby causing the centrifugal separation cylinder to rotate clockwise and the positioning shaft to rotate counterclockwise. At this time, the leachate entering the centrifugal separation cylinder will be driven by multiple slow-flow guide plates to be pushed counterclockwise, thereby causing the leachate to rotate clockwise and counterclockwise inside the centrifugal separation cylinder. The two counterclockwise liquid vortices will offset each other's centrifugal forces, so that the leachate will slowly pass through the mesh on the surface of the centrifugal separation cylinder for separation, and then reduce the collision of small crystalline ice crystals with the surface of the centrifugal separation cylinder. At the same time, since the two ends of the slow-flow guide plate are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate can guide and collect the crystalline ice crystals in the leachate when it rotates, and further reduce the collision of ice crystals with the surface of the centrifugal separation cylinder, thereby achieving the effect of reducing the collision and breakage of ice crystals in the leachate during centrifugal separation.

[0007] Preferably, a second gear ring is fixedly sleeved on the inner circular wall of the centrifugal separation cylinder, a plurality of second cleaning rollers are rotatably connected between the positioning frame and the connecting ring, a second driven gear is fixedly installed on one end of the second cleaning roller, and the second driven gear is meshed with the second gear ring.

[0008] By adopting the above technical solution, the second gear ring is driven to rotate when the centrifugal separation cylinder rotates, and then the multiple second driven gears are engaged with the teeth of the second gear ring to drive the multiple second cleaning rollers to rotate, thereby clearing and cleaning the blockages in the holes inside the centrifugal separation cylinder.

[0009] Preferably, the impurity filter box is fixedly installed with a guide plate on both sides, the impurity filter box is fixedly installed with a first filter plate inside, the impurity filter box is fixedly installed with a filter membrane inside, one side of the impurity filter box and one side of the static crystallization box are fixedly installed with a second connecting pipe, and a second control valve is fixedly installed between the two second connecting pipes.

[0010] By adopting the above technical solution, the landfill leachate to be treated is poured into the interior of the impurity filter box, and then the first filter plate and the filter membrane will filter the large particles and small particles in the leachate respectively, and then the filtered leachate is input into the interior of the static crystallization box through two second connecting pipes and the second control valve for freezing crystallization treatment.

[0011] The transmission gear of the present invention is a gear which is engaged with the gear of the control gear and the gear of the control gear.The gear of the control gear is engaged with the gear of the control gear and the gear of the control gear is engaged with the gear of the control gear.

[0012] By adopting the above technical solution, the driving shaft of the electric motor drives the third driving gear and the second rack to perform gear meshing transmission, and then the movable frame will move linearly accordingly, and then the brush roller will rotate through the gear meshing transmission of the two third driven gears and the two first racks, and dredge and clean the clogged areas of the mesh on the surface of the first filter plate. At the same time, the two movable cleaning rollers will respectively scrape and clean the impurities accumulated on the surface of the first filter plate and the filter membrane, so that the impurities are discharged through the outlet plate.

[0013] Preferably, the interior of the static crystallization box is connected to a spiral stirring paddle for rotation, a second motor is fixedly installed on one side of the static crystallization box, one end of the driving shaft of the second motor is fixedly installed on the spiral stirring paddle, a waterproof cover is fixedly installed on one side of the interior of the static crystallization box, the spiral stirring paddle passes through the waterproof cover, the outer circumferential wall of the spiral stirring paddle is fixedly sleeved with a driving pulley, the interior of the static crystallization box is connected to a screw rod for rotation, the outer circumferential wall of the screw rod is threadedly connected to a clearing plate, a guide rod is fixedly installed on the interior of the static crystallization box, and the guide rod is connected to the clearing plate The cam is connected to the gear train by a gear shift knob, and the cam is connected to the gear train by a gear rotation, and the cam is connected to the gear train by a gear rotation. The cam is connected to the gear train by a gear shift knob, and the cam is connected to the gear train by a gear rotation.

[0014] By adopting the above technical solution, the filtered leachate is added to the interior of the static crystallization box, and then the spiral stirring paddle is driven to rotate by the driving shaft of the second motor, and then the spiral stirring paddle will stir the leachate inside the static crystallization box. At the same time, with the cooperation of the semiconductor refrigeration plate, the leachate inside the static crystallization box is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the static crystallization box. When the crystallization time is over, the leachate is continued to be input into the interior of the centrifugal separation box through the first connecting pipe and the sealing cap, and then the pneumatic push rod is used to make the tensioning wheel squeeze the transmission belt, and then the transmission belt is in a tensioned state. At this time, the driven pulley will drive the screw to rotate, and then the cleaning plate will move linearly and scrape and clean the ice crystals that have settled to the bottom of the static crystallization box.

[0015] Preferably, a material receiving box is fixedly installed on the bottom surface of the centrifugal separation box, a water washing box is fixedly installed on the top surface of the material receiving box, the water washing box is fixedly installed on one side of the centrifugal separation box and the static crystallization box respectively, a plurality of receiving plates are rotatably connected to the inside of the water washing box, a second filter plate is rotatably connected to the inside of the water washing box, a water washing pipe is fixedly installed on the outer wall of the water washing box, a plurality of nozzles are fixedly sleeved on the inner circular wall of the water washing pipe, a first drain pipe is fixedly installed on one side of the material receiving box, and a discharge pipe is fixedly installed on one side of the material receiving box.

[0016] By adopting the above technical solution, the ice crystals inside the static crystallization box and the centrifugal separation box are collected and then fall into the water washing box by gravity, and then multiple receiving plates will block the falling ice crystals, and then multiple nozzles can spray water to wash the ice crystals accumulated on the receiving plates, thereby further cleaning the fine impurities adhering to their surfaces. At this time, under the action of water impact, the ice crystals will fall to the surface of the second filter plate, and then the second filter plate will separate the ice crystals and water, and then the sewage containing impurities will be discharged through the first drain pipe, and the ice crystals will be collected inside the receiving box.

[0017] Preferably, a first drain pipe is fixedly installed on one side of the material receiving box, a rotating shaft is rotatably connected to the interior of the material receiving box, two adjusting wheels are fixedly sleeved on the outer circular wall of the rotating shaft, an adjusting rod is fixedly installed on the bottom surface of the second filter plate, a linkage plate is fixedly installed on the top surface of the second filter plate, the linkage plate is rotatably connected to several of the receiving plates, and positioning seats are fixedly installed on both sides of the interior of the centrifugal separation box, a connecting column is movably sleeved on the inner circular wall of the positioning seat, a reset spring is movably sleeved on the outer circular wall of the connecting column, the top surface of the connecting column is fixedly installed with the second filter plate, and one end of the driving shaft of the first drain pipe is fixedly installed on the rotating shaft.

[0018] By adopting the above technical solution, the driving shaft of the first drain pipe drives the rotating shaft and the two adjusting wheels to rotate, and then the adjusting wheel will continuously hit the adjusting rod, so that the adjusting rod drives the second filter plate and the linkage plate to move up and down repeatedly, and then the linkage plate will drive multiple receiving plates to rotate repeatedly, thereby preventing ice crystals from accumulating on the surface of the receiving plate and the second filter plate for a long time and forming lumps, making it difficult for them to enter the interior of the material receiving box.

[0019] Preferably, a third motor is fixedly mounted on one side of the material receiving box, a feeding auger is rotatably connected to the interior of the material receiving box, and one end of the driving shaft of the third motor is fixedly mounted to the feeding auger.

[0020] By adopting the above technical solution, the third motor drives the feed auger to rotate, so that the ice crystals can be continuously pushed into the inside of the receiving box to prevent them from accumulating, and the ice crystals can be discharged through the discharge pipe by the feed auger.

[0021] The present invention also provides a low-temperature step-by-step freezing and concentration device and method for landfill leachate, the specific steps of which are as follows: Step 1: The landfill leachate to be treated is poured into the interior of the impurity filter box, and then the first filter plate and the filter membrane will filter the large particles and small particles in the leachate respectively, and then the filtered leachate is input into the interior of the static crystallization box through the two second connecting pipes and the second control valve for freezing crystallization treatment, and the driving shaft of the electric motor drives the third driving gear and the second rack to perform gear meshing transmission, and then the movable frame will move linearly accordingly, and then the two third driven gears and the two first racks are driven by the gear meshing transmission to rotate the brush roller, and the clogged mesh of the first filter plate surface is cleared and cleaned, and at the same time, the two moving cleaning rollers will scrape and clean the impurities accumulated on the surface of the first filter plate and the filter membrane respectively, so that the impurities are discharged through the outlet plate; Step 2: The filtered leachate is added to the interior of the static crystallization box through the second connecting pipe, and the spiral stirring paddle is driven to rotate by the driving shaft of the second motor, and then the spiral stirring paddle will stir the leachate inside the static crystallization box. At the same time, with the cooperation of the semiconductor refrigeration plate, the leachate inside the static crystallization box is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the static crystallization box. When the crystallization time is over, the leachate is continued to be input into the interior of the centrifugal separation box through the first connecting pipe and the sealing cap, and then the pneumatic push rod is used to make the tensioning wheel squeeze the transmission belt, and then the transmission belt is in a tensioned state. At this time, the driven pulley will drive the screw to rotate, and then the cleaning plate will move linearly and scrape and clean the ice crystals settled on the bottom of the static crystallization box, thereby achieving the effect of freezing the leachate, causing it to crystallize, and facilitating the collection of large ice crystals. Step 3: The leachate after freezing and crystallization is input into the interior of the centrifugal separation box, and then the leachate will directly enter the interior of the centrifugal separation cylinder, and then the first driving gear and the second driving gear are rotated simultaneously by the first motor. At this time, the second driving gear will rotate clockwise, and the first driving gear will rotate counterclockwise, thereby causing the centrifugal separation cylinder to rotate clockwise and the positioning shaft to rotate counterclockwise. At this time, the leachate entering the centrifugal separation cylinder will be driven by multiple slow-flow guide plates to be pushed counterclockwise, thereby causing the leachate to have two clockwise and counterclockwise liquid vortices inside the centrifugal separation cylinder. At this time, the two vortices will offset each other's centrifugal force, thereby causing the leachate to slowly pass through the centrifuge. The mesh holes on the surface of the separation cylinder are used for separation, and then the collision of fine ice crystals with the surface of the centrifugal separation cylinder can be reduced. At the same time, since the two ends of the slow-flow guide plate are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate guides and collects the ice crystals in the leakage liquid when it rotates, thereby further reducing the collision of the ice crystals with the surface of the centrifugal separation cylinder. At the same time, the second gear ring is driven to rotate when the centrifugal separation cylinder rotates, and then the multiple second driven gears and the teeth of the second gear ring are engaged and driven to cause the multiple second cleaning rollers to rotate, thereby clearing the blockages in the holes inside the centrifugal separation cylinder, thereby achieving the effect of reducing the collision and breakage of the ice crystals in the leachate when they are centrifuged. Step 4: After the ice crystals in the static crystallization box and the centrifugal separation box are collected, they will fall into the water washing box by gravity, and then multiple receiving plates will block the falling ice crystals, and then multiple nozzles can spray water to wash the ice crystals accumulated on the receiving plates, thereby further cleaning the fine impurities adhering to their surfaces. At this time, under the action of water impact, the ice crystals will fall to the surface of the second filter plate, and then the second filter plate will separate the ice crystals and water, and then the sewage containing impurities will be discharged through the first drain pipe, and the ice crystals will be collected in the receiving box, and then driven by the first drain pipe. The shaft drives the rotating shaft and the two adjusting wheels to rotate, and the adjusting wheel will continuously hit the adjusting rod, so that the adjusting rod drives the second filter plate and the linkage plate to move up and down repeatedly, and then the linkage plate will drive multiple receiving plates to rotate repeatedly, thereby preventing ice crystals from accumulating on the surface of the receiving plate and the second filter plate for a long time and forming lumps and being difficult to enter the interior of the receiving box. At the same time, the third motor drives the feeding auger to rotate, so that the ice crystals can be continuously pushed to the interior of the receiving box to prevent them from accumulating, and the ice crystals can be discharged through the discharge pipe by the feeding auger, so as to achieve the effect of washing and collecting the ice crystals.

[0022] In summary, the present invention mainly has the following beneficial effects: 1. The present invention rotates the centrifugal separation cylinder clockwise and the positioning shaft counterclockwise. At this time, the leachate entering the centrifugal separation cylinder will be driven by multiple slow-flow guide plates to be pushed counterclockwise, so that the leachate has two liquid vortices, clockwise and counterclockwise, inside the centrifugal separation cylinder, so that the leachate slowly passes through the mesh holes on the surface of the centrifugal separation cylinder for separation, and then the collision of small crystalline ice crystals with the surface of the centrifugal separation cylinder can be reduced. At the same time, because the two ends of the slow-flow guide plates are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plates can guide and collect the crystalline ice crystals in the leakage liquid when rotating, thereby achieving the effect of facilitating the centrifugal separation of ice crystals in the leachate and reducing the collision and breakage of ice crystals.

[0023] 2. The present invention drives the second gear ring to rotate when the centrifugal separation cylinder rotates, and then the multiple second driven gears are engaged with the teeth of the second gear ring to drive the multiple second cleaning rollers to rotate, thereby clearing the blocked holes inside the centrifugal separation cylinder.

[0024] 3. The present invention pours the landfill leachate to be treated into the interior of the impurity filter box, and then the first filter plate and the filter membrane filter the large particles and small particles of impurities in the leachate respectively, and then inputs the filtered leachate into the interior of the static crystallization box through two second connecting pipes and the second control valve for freeze crystallization treatment.

[0025] 4. The present invention drives the third driving gear and the second rack to perform gear meshing transmission through the driving shaft of the electric motor, and then the movable frame will move linearly accordingly, and then the brush roller will rotate through the gear meshing transmission of the two third driven gears and the two first racks, and dredge and clean the blocked mesh holes on the surface of the first filter plate. At the same time, the two movable cleaning rollers will respectively scrape and clean the impurities accumulated on the surface of the first filter plate and the filter membrane, so that the impurities can be discharged through the outlet plate.

[0026] 5. The present invention drives the spiral stirring paddle to rotate through the driving shaft of the second motor, and then the spiral stirring paddle will stir the leachate inside the static crystallization box. At the same time, with the cooperation of the semiconductor refrigeration plate, the leachate inside the static crystallization box is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will settle inside the static crystallization box. When the crystallization time is over, the leachate is continued to be input into the interior of the centrifugal separation box through the first connecting pipe and the sealing cap, and then the pneumatic push rod is used to make the tensioning wheel squeeze the transmission belt, and then the transmission belt is in a tensioned state. At this time, the driven pulley will drive the screw to rotate, and then the cleaning plate will move linearly and scrape and clean the ice crystals that have settled to the bottom of the static crystallization box.

[0027] 6. In the present invention, the ice crystals inside the static crystallization box and the centrifugal separation box are collected and then fall into the water washing box by gravity, and then a plurality of receiving plates will block the falling ice crystals, and then a plurality of nozzles can spray water to wash the ice crystals accumulated on the receiving plates, thereby further cleaning the fine impurities adhering to the surface thereof. At this time, under the action of the water impact force, the ice crystals will fall to the surface of the second filter plate, and then the second filter plate will separate the ice crystals and water, and then the sewage containing impurities will be discharged through the first drain pipe, and the ice crystals will be collected inside the receiving box. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the mounting cover structure of the present invention; Figure 3 This is a schematic diagram of the second connecting pipe structure of the present invention; Figure 4 It is a schematic structural diagram of a centrifugal separation box of the present invention; Figure 5 yes Figure 4 A partial enlarged schematic diagram; Figure 6 yes Figure 4 A partial enlarged schematic diagram of B in the middle; Figure 7 It is a schematic structural diagram of the slow flow guide plate of the present invention; Figure 8 It is a structural schematic diagram of the impurity filter box of the present invention; Figure 9 It is a schematic structural diagram of a stationary crystallization box of the present invention; Figure 10 It is a structural schematic diagram of the material receiving box of the present invention; Figure 11 yes Figure 10 A partial enlarged schematic diagram of C in the middle.

[0029] 1. Centrifugal separation box; 2. Stationary crystallization box; 3. Impurity filter box; 4. Material receiving box; 5. First motor; 6. Mounting cover; 7. Third motor; 8. Second motor; 9. Slide rail; 10. Lead-out plate; 11. First connecting pipe; 12. First drain pipe; 13. First driving gear; 14. Discharge pipe; 15. Water washing box; 16. Water washing pipe; 17. Second connecting pipe; 18. Second control valve; 19. Feed hole; 20. Discharge hole; 21. Slow flow guide plate; 22. Second cleaning roller; 23. Centrifugal separation cylinder; 24. First gear ring; 25. Semiconductor refrigeration plate; 26. Second drain pipe; 27. Attachment shaft; 28. Second driving gear; 29. ​​Sealing cap; 30. First driven gear; 31. Feed pipe; 32. First control valve; 33. Positioning shaft; 34. Positioning 3. Positioning frame; 35. Mounting frame; 36. Second gear ring; 37. Connecting ring; 38. Second driven gear; 39. First filter plate; 40. Filter membrane; 41. First rack; 42. Guide plate; 43. Second rack; 44. Slide; 45. Electric motor; 46. Third driving gear; 47. Moving frame; 48. Cleaning roller; 49. Brush roller; 50. Third driven gear; 51. Screw agitator; 52. Waterproof cover; 53. Driving pulley; 54. Driven pulley; 55. Transmission belt; 56. Pneumatic push rod; 57. Screw; 58. Guide rod; 59. Cleaning plate; 60. Feeding auger; 61. Receiver plate; 62. Second filter plate; 63. Adjusting rod; 64. Rotating shaft; 65. Adjusting wheel; 66. Linkage plate; 67. Positioning seat; 68. Connecting column; 69. Return spring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example: Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7The landfill leachate low-temperature step-by-step freezing concentration device comprises: a centrifugal separation box 1, a static crystallization box 2 is fixedly installed on the top surface of the centrifugal separation box 1, and an impurity filter box 3 is fixedly installed on the top surface of the static crystallization box 2; semiconductor refrigeration plates 25 are fixedly installed on both sides of the interior of the centrifugal separation box 1 and the static crystallization box 2, a centrifugal separation cylinder 23 is rotatably connected to the interior of the centrifugal separation box 1, and a first gear ring 24 is fixedly sleeved on the outer circumferential wall surface of the centrifugal separation cylinder 23, a mounting cover 6 is fixedly installed on one side of the centrifugal separation box 1, and a first motor 5 is fixedly installed on one side of the mounting cover 6. One end of the driving shaft of the motor 5 is fixedly mounted with a receiving shaft 27, which passes through and extends into the interior of the centrifugal separation box 1. One end of the receiving shaft 27 is fixedly mounted with a second driving gear 28, which is meshed and connected with the first gear ring 24. The outer circumferential wall of the receiving shaft 27 is fixedly sleeved with the first driving gear 13. A feed hole 19 is opened on one side of the centrifugal separation box 1, and a discharge hole 20 is opened on the other side of the centrifugal separation box 1. A mounting bracket 35 is fixedly mounted inside the feed hole 19 and the discharge hole 20, and a positioning shaft 33 is rotatably connected between the two mounting brackets 35.The outer circumferential surface of the positioning shaft 33 is fixedly sleeved with a positioning frame 34, and a plurality of slow-flow guide plates 21 are fixedly installed on one side of the positioning frame 34. The inner circumferential surface of the centrifugal separation cylinder 23 is rotatably connected with a connecting ring 37. The inner circumferential surface of the connecting ring 37 is fixedly installed with the slow-flow guide plate 21. The inner circumferential surface of the feed hole 19 is fixedly sleeved with a sealing cap 29. The positioning shaft 33 passes through the outside of the sealing cap 29. The outer circumferential surface of the positioning shaft 33 is fixedly sleeved with a first driven gear 30. The first driven gear 30 is meshed with the first driving gear 13. The bottom surface of the centrifugal separation box 1 is fixedly installed with a second drain pipe 26. By The leachate after freezing crystallization is input into the interior of the centrifugal separation box 1, and then the leachate will directly enter the interior of the centrifugal separation cylinder 23, and then the first motor 5 will make the first driving gear 13 and the second driving gear 28 rotate simultaneously. At this time, the second driving gear 28 will rotate clockwise, and the first driving gear 13 will rotate counterclockwise, thereby causing the centrifugal separation cylinder 23 to rotate clockwise and the positioning shaft 33 to rotate counterclockwise. At this time, the leachate entering the interior of the centrifugal separation cylinder 23 will be driven by the multiple slow flow guide plates 21 to be pushed counterclockwise, thereby causing the leachate to exist in the interior of the centrifugal separation cylinder 23 in a clockwise direction. The two vortexes of liquid in clockwise and counterclockwise directions will cancel each other out the centrifugal force generated by each other, so that the leachate can slowly pass through the mesh holes on the surface of the centrifugal separation cylinder 23 for separation, and then reduce the collision of small crystalline ice crystals with the surface of the centrifugal separation cylinder 23. At the same time, since the two ends of the slow-flow guide plate 21 are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate 21 can guide and collect the crystalline ice crystals in the leachate when it rotates, and further reduce the collision of ice crystals with the surface of the centrifugal separation cylinder 23, thereby facilitating the centrifugal separation of ice crystals in the leachate and reducing their occurrence. To reduce the collision and crushing effect, a second gear ring 36 is fixedly sleeved on the inner circumferential surface of the centrifugal drum 23. A plurality of second cleaning rollers 22 are rotatably connected between the positioning frame 34 and the connecting ring 37. A second driven gear 38 is fixedly mounted on one end of the second cleaning roller 22. The second driven gear 38 is meshed with the second gear ring 36. When the centrifugal drum 23 rotates, the second gear ring 36 is driven to rotate. Then, through the meshing transmission of the teeth of the plurality of second driven gears 38 and the second gear ring 36, the plurality of second cleaning rollers 22 are caused to rotate, thereby clearing the blockage in the internal holes of the centrifugal drum 23.

[0032] Based on the above embodiment, reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 8 、 Figure 9 and Figure 10, the two sides of the impurity filter box 3 are respectively fixedly installed with a guide plate 10, the interior of the impurity filter box 3 is fixedly installed with a first filter plate 39, the interior of the impurity filter box 3 is fixedly installed with a filter membrane 40, one side of the impurity filter box 3 and one side of the static crystallization box 2 are fixedly installed with a second connecting pipe 17, and a second control valve 18 is fixedly installed between the two second connecting pipes 17. By pouring the garbage leachate to be treated into the interior of the impurity filter box 3, the first filter plate 39 and the filter membrane 40 will filter the large particles and small particles in the leachate respectively, and then the filtered leachate is input into the interior of the static crystallization box 2 for frozen crystallization treatment through the two second connecting pipes 17 and the second control valve 18. The first rack 41, the guide plate 42 is fixedly installed inside the impurity filter box 3, the interior of the impurity filter box 3 is slidably connected to the mobile frame 47, the interior of the mobile frame 47 is fixedly installed with two cleaning rollers 48, the two cleaning rollers 48 correspond to the positions of the first filter plate 39 and the filter membrane 40 respectively, the internal rotation of the mobile frame 47 is connected with a brush roller 49, both ends of the brush roller 49 are fixedly installed with a third driven gear 50, the third driven gear 50 is meshed with the first rack 41, a slide rail 9 is fixedly installed on one side of the impurity filter box 3, a second rack 43 is fixedly installed on one side of the slide rail 9, a slide seat 44 is slidably connected to the outside of the slide rail 9, an electric motor 45 is fixedly installed on one side of the slide seat 44, and one end of the drive shaft of the electric motor 45 is fixed to the brush roller 49 The outer wall surface of the driving shaft of the electric motor 45 is fixedly sleeved with a third driving gear 46, and the third driving gear 46 is meshed with the second rack 43. The driving shaft of the electric motor 45 drives the third driving gear 46 and the second rack 43 to perform gear meshing transmission, and then the movable frame 47 will move linearly accordingly, and then the two third driven gears 50 and the two first racks 41 are meshed with each other to make the brush roller 49 rotate, and clear the blockage of the mesh on the surface of the first filter plate 39. At the same time, the two moving cleaning rollers 48 will respectively scrape and clean the impurities accumulated on the surface of the first filter plate 39 and the filter membrane 40, so that the impurities are discharged through the derivation plate 10. The internal rotation of the stationary crystallization box 2 is connected with a spiral stirring paddle 51. A second motor 8 is fixedly installed on one side of the static crystallization box 2, and one end of the driving shaft of the second motor 8 is fixedly installed with a spiral stirring paddle 51. A waterproof cover 52 is fixedly installed on one side of the interior of the static crystallization box 2, and the spiral stirring paddle 51 penetrates the waterproof cover 52. The outer circular wall surface of the spiral stirring paddle 51 is fixedly sleeved with a driving pulley 53. The interior of the static crystallization box 2 is rotatably connected with a screw rod 57, and the outer circular wall surface of the screw rod 57 is threadedly connected with a cleaning plate 59. The interior of the static crystallization box 2 is fixedly installed with a guide rod 58, and the guide rod 58 is slidably connected to the cleaning plate 59. The outer circular wall surface of the screw rod 57 is fixedly sleeved with a driven pulley 54. A transmission belt 55 is provided between the driven pulley 54 and the driving pulley 53, and the driving pulley 53 and the driven pulley 54 are connected through the transmission belt 55.A pneumatic push rod 56 is fixedly installed on one side of the interior of the waterproof cover 52, and a tensioning wheel is fixedly installed on one end of the telescopic rod of the pneumatic push rod 56. The inner wall surface of the tensioning wheel is movably connected to the transmission belt 55. A first connecting pipe 11 is fixedly installed on one side of the static crystallization box 2, and a feed pipe 31 is fixedly installed on one side of the sealing cap 29. A first control valve 32 is fixedly installed between the first connecting pipe 11 and the feed pipe 31. By adding the filtered leakage liquid into the interior of the static crystallization box 2, the spiral stirring paddle 51 is driven to rotate by the driving shaft of the second motor 8, and then the spiral stirring paddle 51 will stir the leachate inside the static crystallization box 2. At the same time, with the cooperation of the semiconductor refrigeration plate 25, the leachate inside the static crystallization box 2 is frozen. At this time, under the action of low temperature, the leachate will crystallize. Then, due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the static crystallization box 2. When the crystallization time is over, the leachate is continuously input into the interior of the centrifugal separation box 1 through the first connecting pipe 11 and the sealing cap 29, and then the pneumatic push rod 56 is used to make the tensioning wheel squeeze the transmission belt 55, so that the transmission belt 55 is in a tensioned state. At this time, the driven pulley 54 will drive the screw rod 57 to rotate, and the cleaning plate 59 will be straightened. The line moves and scrapes and cleans the ice crystals that have settled on the bottom of the static crystallization box 2. A collecting box 4 is fixedly installed on the bottom surface of the centrifugal separation box 1, and a water washing box 15 is fixedly installed on the top surface of the collecting box 4. The water washing box 15 is fixedly installed on one side of the centrifugal separation box 1 and the static crystallization box 2 respectively. The inside of the water washing box 15 is rotatably connected to a plurality of receiving plates 61, and the inside of the water washing box 15 is rotatably connected to a second filter plate 62. A water washing pipe 16 is fixedly installed on the outer wall of the water washing box 15, and a plurality of nozzles are fixedly sleeved on the inner circular wall of the water washing pipe 16. A first drain pipe 12 is fixedly installed on one side of the collecting box 4, and a The discharge pipe 14 collects the ice crystals inside the stationary crystallization box 2 and the centrifugal separation box 1 and then falls by gravity into the water washing box 15. Then, multiple receiving plates 61 will block the falling ice crystals. Then, multiple nozzles can spray water to wash the ice crystals accumulated on the receiving plates 61, thereby further cleaning the fine impurities adhering to their surfaces. At this time, under the action of the water impact, the ice crystals will fall to the surface of the second filter plate 62. Then, the second filter plate 62 will separate the ice crystals and water. Then, the sewage containing impurities will be discharged through the first drain pipe 12, and the ice crystals will be collected in the inside of the receiving box 4.

[0033] Based on the above embodiment, refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 10 and Figure 11, a first drain pipe 12 is fixedly installed on one side of the material receiving box 4, and a rotating shaft 64 is rotatably connected inside the material receiving box 4. Two adjusting wheels 65 are fixedly sleeved on the outer circular wall of the rotating shaft 64, and an adjusting rod 63 is fixedly installed on the bottom surface of the second filter plate 62. A linkage plate 66 is fixedly installed on the top surface of the second filter plate 62. The linkage plate 66 is rotatably connected to several receiving plates 61. Positioning seats 67 are fixedly installed on both sides of the interior of the centrifugal separation box 1, and a connecting column 68 is movably sleeved on the inner circular wall of the positioning seat 67. A reset spring 69 is movably sleeved on the outer circular wall of the connecting column 68. The top surface of the connecting column 68 is fixedly installed with the second filter plate 62. One end of the driving shaft of the first drain pipe 12 is fixedly installed with the rotating shaft 64, and the rotating shaft 64 and the two adjusting wheels are driven by the driving shaft of the first drain pipe 12. 65 rotates, and then the adjusting wheel 65 will continuously hit the adjusting rod 63, so that the adjusting rod 63 drives the second filter plate 62 and the linkage plate 66 to move up and down repeatedly, and then the linkage plate 66 will drive multiple receiving plates 61 to rotate repeatedly, thereby preventing ice crystals from accumulating on the surfaces of the receiving plate 61 and the second filter plate 62 for a long time and forming lumps and being difficult to enter the interior of the material receiving box 4. A third motor 7 is fixedly installed on one side of the material receiving box 4, and the internal rotation of the material receiving box 4 is connected to the feeding auger 60. One end of the driving shaft of the third motor 7 is fixedly installed with the feeding auger 60, and the feeding auger 60 is driven to rotate by the third motor 7, so that the ice crystals can be continuously pushed to the interior of the material receiving box 4 to prevent them from accumulating, and the ice crystals can be discharged through the discharge pipe 14 through the feeding auger 60.

[0034] Based on the above embodiment, reference Figures 1-11 The present invention also provides a low-temperature step-by-step freezing concentration device and method for landfill leachate, the specific steps of which are as follows: Step 1: The landfill leachate to be treated is poured into the impurity filter box 3, and then the first filter plate 39 and the filter membrane 40 will filter the large particles and small particles in the leachate respectively, and then the filtered leachate is input into the static crystallization box 2 through the two second connecting pipes 17 and the second control valve 18 for freezing crystallization treatment, and the driving shaft of the electric motor 45 drives the third driving gear 46 and the second rack 43 to perform gear meshing transmission, and then the movable frame 47 will move linearly accordingly, and then the two third driven gears 50 and the two first racks 41 are gear meshing transmission to rotate the brush roller 49, and clear the blockage of the mesh on the surface of the first filter plate 39, and at the same time, the two movable cleaning rollers 48 will scrape and clean the impurities accumulated on the surface of the first filter plate 39 and the filter membrane 40, so that the impurities are discharged through the outlet plate 10; Step 2: The filtered leachate is added to the interior of the stationary crystallization box 2 through the second connecting pipe 17, and then the spiral stirring paddle 51 is driven by the driving shaft of the second motor 8 to rotate, and then the spiral stirring paddle 51 will stir the leachate inside the stationary crystallization box 2. At the same time, with the cooperation of the semiconductor refrigeration plate 25, the leachate inside the stationary crystallization box 2 is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the stationary crystallization box 2. When the crystallization time is over, the leachate is continuously fed into the interior of the centrifugal separation box 1 through the first connecting pipe 11 and the sealing cap 29, and then the pneumatic push rod 56 is used to make the tensioning wheel squeeze the transmission belt 55, so that the transmission belt 55 is in a tensioned state. At this time, the driven pulley 54 drives the screw rod 57 to rotate, and then the cleaning plate 59 moves linearly and scrapes and cleans the ice crystals settled on the bottom of the static crystallization box 2, thereby achieving the effect of freezing the leachate, causing it to crystallize, and facilitating the collection of large ice crystals; Step 3: The leachate after freezing and crystallization is input into the interior of the centrifugal separation box 1, and then the leachate will directly enter the interior of the centrifugal separation cylinder 23, and then the first motor 5 is used to rotate the first driving gear 13 and the second driving gear 28 at the same time. At this time, the second driving gear 28 will rotate clockwise, and the first driving gear 13 will rotate counterclockwise, thereby causing the centrifugal separation cylinder 23 to rotate clockwise and the positioning shaft 33 to rotate counterclockwise. At this time, the leachate entering the interior of the centrifugal separation cylinder 23 will be driven by the multiple slow flow guide plates 21 to be pushed counterclockwise, thereby causing the leachate to have two clockwise and counterclockwise liquid vortices in the interior of the centrifugal separation cylinder 23. At this time, the two vortices will offset each other's centrifugal force, thereby causing the leachate to slowly pass through the centrifugal separation cylinder 23. The mesh holes on the surface of the separation cylinder 23 are separated, and then the collision of fine crystalline ice crystals with the surface of the centrifugal separation cylinder 23 can be reduced. At the same time, since the two ends of the slow-flow guide plate 21 are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate 21 guides and collects the crystalline ice crystals in the leakage liquid when it rotates, thereby further reducing the collision of ice crystals with the surface of the centrifugal separation cylinder 23. At the same time, the second gear ring 36 is driven to rotate when the centrifugal separation cylinder 23 rotates, and then the multiple second driven gears 38 are engaged with the second gear ring 36 to drive the multiple second cleaning rollers 22 to rotate, thereby clearing the blockage of the holes inside the centrifugal separation cylinder 23, thereby achieving the effect of reducing the collision and breakage of ice crystals in the leachate when they are centrifuged. Step 4: After the ice crystals in the crystallization box 2 and the centrifugal separation box 1 are collected, they will fall into the water washing box 15 by gravity, and then the multiple receiving plates 61 will block the falling ice crystals, and then the ice crystals accumulated on the receiving plates 61 can be washed by spraying water through multiple nozzles, so as to further clean the fine impurities adhering to the surface. At this time, under the action of the water impact force, the ice crystals will fall to the surface of the second filter plate 62, and then the second filter plate 62 will separate the ice crystals and water, and then the sewage containing impurities will be discharged through the first drain pipe 12, and the ice crystals will be collected in the inside of the receiving box 4, and then the driving shaft of the first drain pipe 12 will drive the rotating shaft 64. The two adjusting wheels 65 rotate, and the adjusting wheel 65 will continuously hit the adjusting rod 63, so that the adjusting rod 63 drives the second filter plate 62 and the linkage plate 66 to move up and down repeatedly, and then the linkage plate 66 will drive multiple receiving plates 61 to rotate repeatedly, thereby preventing ice crystals from accumulating on the surface of the receiving plate 61 and the second filter plate 62 for a long time and forming lumps and being difficult to enter the interior of the material receiving box 4. At the same time, the third motor 7 drives the feeding auger 60 to rotate, so that the ice crystals can be continuously pushed to the interior of the material receiving box 4 to prevent them from accumulating, and the ice crystals can be discharged through the discharge pipe 14 by the feeding auger 60, so as to achieve the effect of washing and collecting the ice crystals.

[0035] Working principle: Please refer to Figures 1-11 As shown, by inputting the frozen crystallized leachate into the interior of the centrifugal separation box 1, the leachate will directly enter the interior of the centrifugal separation cylinder 23, and then the first motor 5 will cause the first driving gear 13 and the second driving gear 28 to rotate simultaneously. At this time, the second driving gear 28 will rotate clockwise, and the first driving gear 13 will rotate counterclockwise, thereby causing the centrifugal separation cylinder 23 to rotate clockwise and the positioning shaft 33 to rotate counterclockwise. At this time, the leachate entering the interior of the centrifugal separation cylinder 23 will be driven by the multiple slow flow guide plates 21 to be pushed counterclockwise, thereby causing the leachate to exist in the interior of the centrifugal separation cylinder 23 in a clockwise direction. The two liquid vortices, clockwise and counterclockwise, will offset each other's centrifugal force at this time, so that the leachate can slowly pass through the mesh on the surface of the centrifugal separation cylinder 23 for separation, and then reduce the collision of small crystalline ice crystals with the surface of the centrifugal separation cylinder 23. At the same time, since the two ends of the slow-flow guide plate 21 are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate 21 can guide and collect the crystalline ice crystals in the leakage liquid when it rotates, and further reduce the collision of ice crystals with the surface of the centrifugal separation cylinder 23, thereby achieving the effect of facilitating the centrifugal separation of ice crystals in the leachate and reducing the collision and breakage of ice crystals.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature step-by-step freezing and concentration device for landfill leachate, characterized in that: include: A centrifugal separation box, a static crystallization box is fixedly installed on the top surface of the centrifugal separation box, and an impurity filter box is fixedly installed on the top surface of the static crystallization box; Semiconductor refrigeration plates are fixedly installed on both sides of the interior of the centrifugal separation box and the static crystallization box, the interior of the centrifugal separation box is rotatably connected to a centrifugal separation cylinder, the outer circumferential wall of the centrifugal separation cylinder is fixedly sleeved with a first gear ring, a mounting cover is fixedly installed on one side of the centrifugal separation box, a first motor is fixedly installed on one side of the mounting cover, a receiving shaft is fixedly installed on one end of the first motor drive shaft, the receiving shaft passes through and extends to the interior of the centrifugal separation box, a second driving gear is fixedly installed on one end of the receiving shaft, the second driving gear is meshed with the first gear ring, the outer circumferential wall of the receiving shaft is fixedly sleeved with the first driving gear, a feed hole is provided on one side of the centrifugal separation box, a discharge hole is provided on the other side of the centrifugal separation box, mounting brackets are fixedly installed inside the feed hole and the discharge hole, and a positioning shaft is rotatably connected between the two mounting brackets; The outer circular wall surface of the positioning shaft is fixedly sleeved with a positioning frame, and a plurality of slow-flow guide plates are fixedly installed on one side of the positioning frame. The inner circular wall surface of the centrifugal separation cylinder is rotatably connected with a connecting ring, and the inner circular wall surface of the connecting ring is fixedly installed with the slow-flow guide plate. The inner circular wall surface of the feed hole is fixedly sleeved with a sealing cap, and the positioning shaft passes through the outside of the sealing cap. The outer circular wall surface of the positioning shaft is fixedly sleeved with a first driven gear, and the first driven gear is meshed with the first driving gear. The bottom surface of the centrifugal separation box is fixedly installed with a second drain pipe.

2. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 1, characterized in that: A second gear ring is fixedly sleeved on the inner circular wall surface of the centrifugal separation cylinder, and a plurality of second cleaning rollers are rotatably connected between the positioning frame and the connecting ring. A second driven gear is fixedly installed on one end of the second cleaning roller, and the second driven gear is meshed with the second gear ring. When the centrifugal separation cylinder rotates, the second gear ring is driven to rotate, and then the plurality of second cleaning rollers are caused to rotate by meshing transmission between the plurality of second driven gears and the second gear ring, thereby clearing and cleaning the blockage in the holes inside the centrifugal separation cylinder.

3. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 1, characterized in that: The two sides of the impurity filter box are respectively fixedly installed with export plates, the interior of the impurity filter box is fixedly installed with a first filter plate, the interior of the impurity filter box is fixedly installed with a filter membrane, one side of the impurity filter box and one side of the static crystallization box are both fixedly installed with second connecting pipes, and a second control valve is fixedly installed between the two second connecting pipes. By pouring the garbage leachate to be treated into the interior of the impurity filter box, the first filter plate and the filter membrane will respectively filter the large particles of impurities and small particles of impurities in the leachate, and then the filtered leachate is input into the interior of the static crystallization box through the two second connecting pipes and the second control valve for freezing crystallization treatment.

4. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 3, characterized in that: The first rack is fixedly installed on both sides of the impurity filter box, and a guide plate is fixedly installed on the interior of the impurity filter box. The interior of the impurity filter box is slidably connected to a movable frame, and two cleaning rollers are fixedly installed on the interior of the movable frame. The two cleaning rollers correspond to the positions of the first filter plate and the filter membrane respectively. A brush roller is rotatably connected to the interior of the movable frame, and a third driven gear is fixedly installed on both ends of the brush roller. The third driven gear is meshed with the first rack. A slide rail is fixedly installed on one side of the impurity filter box, and a second rack is fixedly installed on one side of the slide rail. A slide seat is slidably connected to the outside of the slide rail, and an electric motor is fixedly installed on one side of the slide seat. One end of the electric motor driving shaft is fixedly installed with the brush roller, and the outer cylindrical wall surface of the electric motor driving shaft is fixedly sleeved with a third driving gear, which is meshed with the second rack. The driving shaft of the electric motor drives the third driving gear and the second rack to perform gear meshing transmission, and then the movable frame will move linearly accordingly, and then the brush roller will rotate through the gear meshing transmission of the two third driven gears and the two first racks, and the blockage of the mesh on the surface of the first filter plate will be dredged and cleaned. At the same time, the two moving cleaning rollers will scrape and clean the impurities accumulated on the surface of the first filter plate and the filter membrane respectively, so that the impurities are discharged through the export plate.

5. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 1, characterized in that: The outer wall of the screw rod is threadably connected to the outer wall of the cleaning plate, and a driven pulley is fixedly mounted on the inner side of the static crystallization box, the driven pulley and the driven pulley are slidably connected to each other through the transmission belt. A pneumatic push rod is fixedly mounted on the inner side of the waterproof cover, and one end of the pneumatic push rod telescopic rod is fixedly mounted on the tensioning wheel, and the inner wall of the tensioning wheel is movably sleeved with the transmission belt. A first connecting pipe is fixedly mounted on one side of the static crystallization box, and a sealing cap is fixedly mounted on one side. A feed pipe is provided, and a first control valve is fixedly installed between the first connecting pipe and the feed pipe. The filtered leachate is added to the interior of the static crystallization box, and then the spiral stirring paddle is driven to rotate by the driving shaft of the second motor, and then the spiral stirring paddle will stir the leachate inside the static crystallization box. At the same time, with the cooperation of the semiconductor refrigeration plate, the leachate inside the static crystallization box is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the static crystallization box. When the crystallization time is over, the leachate is continued to be input into the interior of the centrifugal separation box through the first connecting pipe and the sealing cap, and then the pneumatic push rod is used to make the tensioning wheel squeeze the transmission belt, and then the transmission belt is in a tensioned state. At this time, the driven pulley will drive the screw to rotate, and then the cleaning plate will move linearly and scrape and clean the ice crystals that have settled to the bottom of the static crystallization box.

6. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 1, characterized in that: The bottom surface of the centrifugal separation box is fixedly installed with a material receiving box, the top surface of the material receiving box is fixedly installed with a water washing box, the water washing box is fixedly installed with one side of the centrifugal separation box and the static crystallization box respectively, the internal rotation of the water washing box is connected to a plurality of receiving plates, the internal rotation of the water washing box is connected to a second filter plate, the outer wall of the water washing box is fixedly installed with a water washing pipe, the inner circular wall of the water washing pipe is fixedly sleeved with a plurality of nozzles, one side of the material receiving box is fixedly installed with a first drain pipe, one side of the material receiving box is fixedly installed with a discharge pipe, through the static crystallization box and the centrifugal separation box. After the ice crystals inside the box are collected, they will fall into the inside of the water washing box by gravity, and then multiple receiving plates will block the falling ice crystals, and then multiple nozzles can spray water to wash the ice crystals accumulated on the receiving plates, thereby further cleaning the fine impurities adhering to their surfaces. At this time, under the action of water impact, the ice crystals will fall to the surface of the second filter plate, and then the second filter plate will separate the ice crystals and water, and then the sewage containing impurities will be discharged through the first drain pipe, and the ice crystals will be collected inside the receiving box.

7. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 6, characterized in that: The top surface of the connecting post is rotatably connected to the second support plate, and the connecting post is rotatably connected to the first support plate.

8. The low-temperature step-by-step freezing and concentration device for landfill leachate according to claim 6, characterized in that: A third motor is fixedly installed on one side of the material receiving box, and a feeding auger is rotatably connected to the interior of the material receiving box. One end of the third motor drive shaft is fixedly installed to the feeding auger, and the feeding auger is driven to rotate by the third motor, so that ice crystals can be continuously pushed into the interior of the material receiving box to prevent them from accumulating, and the ice crystals can be discharged through the discharge pipe by the feeding auger.

9. The concentration method of landfill leachate using a low-temperature step-by-step freeze concentration device according to claim 1, characterized in that: The following steps are involved: Step 1: The landfill leachate to be treated is poured into the interior of the impurity filter box, and then the first filter plate and the filter membrane will filter the large particles and small particles in the leachate respectively, and then the filtered leachate is input into the interior of the static crystallization box through the two second connecting pipes and the second control valve for freezing crystallization treatment, and the driving shaft of the electric motor drives the third driving gear and the second rack to perform gear meshing transmission, and then the movable frame will move linearly accordingly, and then the two third driven gears and the two first racks are driven by the gear meshing transmission to rotate the brush roller, and the clogged mesh of the first filter plate surface is cleared and cleaned, and at the same time, the two moving cleaning rollers will scrape and clean the impurities accumulated on the surface of the first filter plate and the filter membrane respectively, so that the impurities are discharged through the outlet plate; Step 2: The filtered leachate is added to the interior of the static crystallization box through the second connecting pipe, and the spiral stirring paddle is driven to rotate by the driving shaft of the second motor, and then the spiral stirring paddle will stir the leachate inside the static crystallization box. At the same time, with the cooperation of the semiconductor refrigeration plate, the leachate inside the static crystallization box is frozen. At this time, under the action of low temperature, the leachate will crystallize, and then due to the difference in density between the ice crystals and the leachate, the ice crystals will precipitate inside the static crystallization box. When the crystallization time is over, the leachate is continued to be input into the interior of the centrifugal separation box through the first connecting pipe and the sealing cap, and then the pneumatic push rod is used to make the tensioning wheel squeeze the transmission belt, and then the transmission belt is in a tensioned state. At this time, the driven pulley will drive the screw to rotate, and then the cleaning plate will move linearly and scrape and clean the ice crystals settled on the bottom of the static crystallization box, thereby achieving the effect of freezing the leachate, causing it to crystallize, and facilitating the collection of large ice crystals. Step 3: The leachate after freezing and crystallization is input into the interior of the centrifugal separation box, and then the leachate will directly enter the interior of the centrifugal separation cylinder, and then the first driving gear and the second driving gear are rotated simultaneously by the first motor. At this time, the second driving gear will rotate clockwise, and the first driving gear will rotate counterclockwise, thereby causing the centrifugal separation cylinder to rotate clockwise and the positioning shaft to rotate counterclockwise. At this time, the leachate entering the centrifugal separation cylinder will be driven by multiple slow-flow guide plates to be pushed counterclockwise, thereby causing the leachate to have two clockwise and counterclockwise liquid vortices inside the centrifugal separation cylinder. At this time, the two vortices will offset each other's centrifugal force, thereby causing the leachate to slowly pass through the centrifuge. The mesh holes on the surface of the separation cylinder are used for separation, and then the collision of small crystalline ice crystals with the surface of the centrifugal separation cylinder can be reduced. At the same time, since the two ends of the slow-flow guide plate are trapezoidal and the wall shape is arc-shaped, the slow-flow guide plate can guide and collect the crystalline ice crystals in the leakage liquid when it rotates, thereby further reducing the collision of ice crystals with the surface of the centrifugal separation cylinder. At the same time, the second gear ring is driven to rotate when the centrifugal separation cylinder rotates, and then the multiple second driven gears and the teeth of the second gear ring are engaged with each other to drive the multiple second cleaning rollers to rotate, thereby clearing the blockages in the holes inside the centrifugal separation cylinder, thereby achieving the effect of reducing the collision and breakage of ice crystals in the leachate when they are centrifuged.

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