A landfill leachate extraction shaft dredging device

Abstract

The utility model discloses a landfill leachate extraction shaft desilting device, which relates to the technical field of solid (hazardous) waste landfill pollutant risk control. It includes an air compressor, a slurry discharge pipe, an air supply pipe, a slurry blocking plate, an air nozzle, a slurry collecting device, and a bracket; the air compressor is placed on the ground, the two ends of the air supply pipe are respectively connected to the air compressor and the air nozzle, the slurry discharge pipe sleeve is connected to the outside of the air supply pipe, and a gap is left between the inner wall of the slurry discharge pipe and the outer wall of the air supply pipe. The top of the slurry discharge pipe is fixedly connected to the bracket, the bottom end of the slurry discharge pipe is located above the sludge at the bottom of the well, the air nozzle is lower than the bottom end of the slurry discharge pipe, the slurry blocking plate is connected to the bottom end of the slurry discharge pipe, and the bracket is arranged inside the slurry collecting device. The utility model can desilt the landfill waste liquid extraction well and collect the cleaned mud at the same time, without the need to inject water into the well, thus avoiding the increase of waste liquid volume and waste liquid treatment cost due to water injection, and can also prevent the cleaned mud from polluting the surrounding environment.

Description

Technical Field

[0001] The utility model relates to the technical field of solid (hazardous) waste landfill pollutant risk control, and specifically refers to a landfill leachate extraction shaft dredging device. Background Art

[0002] Extraction-treatment technology is an important technical means for groundwater pollution risk control and remediation projects. By establishing extraction wells, the leachate accumulated in the closed landfill space or the contaminated groundwater in the stratum is extracted and treated. In this process, mud and sand often block the water inlet on the inner wall of the well and the filter pipe at the bottom of the well, causing the bottom water pump to fail to work normally, thereby reducing the efficiency of leachate extraction. Therefore, the mud and sand at the bottom of the extraction well should be cleaned regularly to ensure the smooth progress of the extraction work.

[0003] Patents with announcement numbers CN 219773072U, CN 205224062 U, CN 207111014 U and CN104514502A respectively describe well-cleaning and desilting devices for drainage wells in the field of construction engineering. The main devices involved in well-cleaning and desilting include air compressors, high-pressure air ducts, high-pressure water pipes, mud suction pipes or sand discharge pipes, etc. The desilting method is mainly to connect the high-pressure air duct to the air source, inject compressed air into the well, use high-pressure gas to blow the mud, sand and water mixture at the bottom of the well to a certain height, turn off the air compressor, and due to the head difference, a siphon or negative pressure effect will be generated, and the mud, sand and water mixture will continue to rise until it is discharged through the mud suction pipe or sand discharge pipe. In the above-mentioned precipitation well desilting device, the first condition is to maintain a certain amount of water in the well. If there is no water or the amount of water in the well is very small, a certain amount of water needs to be injected so that the conditions for the siphon principle can be generated. Desilting using this principle is due to the fact that the water pressure generated by the natural siphon is not enough, and if the air compressor delivers high-pressure gas for a short time, the lower silt and water are not mixed evenly, and the desilting effect is not ideal. The direct consequence is that multiple cleanings are required, which affects work efficiency and increases costs.

[0004] It should also be noted that the device disclosed in the above patent is only applicable to engineering precipitation or drainage wells in the fields of construction engineering, while for the dredging of extraction wells in solid (hazardous) waste landfills, the sludge or waste liquid to be cleaned are all toxic and harmful wastes. If the above dredging device is used, firstly, if water is injected into the well, the amount of waste liquid in the well will increase, resulting in an increase in the amount of waste liquid treated and an increase in cost; secondly, during the dredging process, especially when high-pressure gas is used to blow the bottom sludge, if the operation is improper, a small amount of waste liquid and sludge mixture will inevitably splash out of the wellhead, causing surface soil or vegetation to be contaminated, causing damage to the environment. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a landfill leachate extraction shaft dredging device, which can dredge the landfill waste liquid extraction well and collect the cleaned mud at the same time, without the need to inject water into the well, thus avoiding the increase of waste liquid amount and waste liquid treatment cost due to water injection, and can also prevent the cleaned mud from polluting the surrounding environment.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a landfill leachate extraction shaft dredging device, comprising an air compressor, a slurry discharge pipe, an air supply pipe, a slurry blocking plate, an air nozzle, a mud collecting device, and a bracket; the air compressor is placed on the ground, and the two ends of the air supply pipe are respectively connected to the air compressor and the air nozzle, the air nozzle and the air supply pipe are detachably connected, the slurry discharge pipe is sleeved and connected to the outside of the air supply pipe, a gap is left between the inner wall of the slurry discharge pipe and the outer wall of the air supply pipe, the top of the slurry discharge pipe is fixedly connected to the top of the bracket, the bottom end of the slurry discharge pipe is located above the sludge at the bottom of the well, the air nozzle is lower than the bottom end of the slurry discharge pipe, the slurry blocking plate is detachably connected to the bottom end of the slurry discharge pipe, the mud collecting device is a hollow box structure, the side plate of the mud collecting device is provided with a second hole, the air supply pipe passes through the second hole and enters the slurry discharge pipe, the bottom plate of the mud collecting device is provided with a first hole, the first hole is sleeved on the outside of the well pipe exposed to the ground, and the bracket is arranged inside the mud collecting device.

[0007] Preferably, the slurry discharge pipe is divided into several sections, a first connecting ring is fixedly connected to the top of the top slurry discharge pipe, the first connecting ring is fixedly connected to the top of the bracket, a second connecting ring is fixedly connected to the bottom end of the terminal slurry discharge pipe, and a slurry blocking plate is detachably connected to the second connecting ring.

[0008] Preferably, the first connecting ring includes a first flange ring, a plurality of first connecting rods, and a first center ring. The first flange ring is fixedly connected to the top surface of the top slurry discharge pipe, the first center ring is arranged at the center of the first flange ring, and the two ends of the first connecting rod are respectively fixedly connected to the first flange ring and the first center ring. The first flange ring is fixedly connected to the top of the bracket.

[0009] Preferably, the second connecting ring includes a second flange ring, a plurality of second connecting rods, and a second center ring. The second flange ring is fixedly connected to the bottom end surface of the terminal slurry discharge pipe. The second center ring is arranged at the center of the second flange ring. The two ends of the second connecting rod are respectively fixedly connected to the second center ring and the second flange ring. The second flange ring is detachably connected to the slurry blocking plate.

[0010] Preferably, the air nozzle comprises a first air nozzle, and the angle between the air outlet of the first air nozzle and the horizontal plane is an acute angle.

[0011] Preferably, the gas nozzle comprises a second gas nozzle, and the second gas nozzle is provided with a plurality of gas outlets, each gas outlet being perpendicular to the pipe wall of the well pipe.

[0012] Preferably, a rotatable cover plate is provided on the top of the mud collecting device, and a handle is provided on the cover plate.

[0013] The beneficial effects of adopting the above technical solution are:

[0014] 1. In the utility model, the mud skin attached to the wall of the extraction well can be blown away by the second air nozzle to make it detach from the bottom of the well, and the blown away mud skin and the sludge at the bottom of the well are collected at the bottom of the extraction well, and then the second air nozzle is used to blow away the sludge and waste liquid at the bottom of the well, and the two are combined to form fluid mud, which rushes upward along the gap between the slurry discharge pipe and the air supply pipe under the action of high-intensity airflow, and the fluid mud is transported out of the wellhead and gathered in the mud collection device for unified collection. The utility model is simple to operate and is very convenient for dredging, which greatly improves the effect and efficiency of dredging. At the same time, the cleaned mud will not cause pollution to the surrounding environment, and is suitable for dredging extraction wells in various types of landfills.

[0015] 2. The utility model does not need to inject water into the well when cleaning sludge, thus avoiding the problem of increased waste liquid volume due to water injection, thereby increasing treatment costs.

[0016] 3. In the utility model, a slurry blocking plate is detachably connected to the bottom of the end slurry discharge pipe. On the one hand, the fluid slurry generated by high-pressure gas blowing can fully enter the gap between the slurry discharge pipe and the air supply pipe, thereby improving the dredging effect. On the other hand, it can prevent the slurry formed by high-pressure gas blowing from sloshing up and splashing onto the inner wall of the well pipe, blocking the water inlet on the filter pipe, and affecting the dredging effect of the well wall. It can also prevent the slurry formed by blowing from sloshing up and sticking to the outer wall of the slurry discharge pipe and the bottom under the well cover, thereby affecting the dredging effect. Therefore, by setting the slurry blocking plate, the dredging efficiency is improved, and the dredging effect is more obvious.

[0017] 4. A first center ring is provided on the top slurry discharge pipe, and a second center ring is provided on the end slurry discharge pipe. The upper and lower center rings limit the air supply pipe to prevent the air supply pipe from swinging back and forth in the slurry discharge pipe, thereby affecting the smooth discharge of the mud, thereby improving the stability of the device and the sludge cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the dredging device;

[0019] Figure 2 is a schematic diagram of the structure of the bracket;

[0020] Figure 3 It is a schematic diagram of the connection structure between the end slurry discharge pipe and the slurry blocking plate;

[0021] Figure 4 It is a schematic diagram of the structure of the end slurry discharge pipe and the top slurry discharge pipe;

[0022] Figure 5is a schematic diagram of the structure of the mud collection device;

[0023] In the figure: 1. air compressor; 2. slurry discharge pipe; 21. top slurry discharge pipe; 211. first connecting hole; 212. first connecting ring; 213. first connecting rod; 22. end slurry discharge pipe; 221. second connecting hole; 222. second connecting ring; 223. second connecting rod; 3. air supply pipe; 4. well pipe; 5. slurry blocking plate; 51. first bolt; 6. mud at the bottom of the well; 7. air nozzle; 71. first air nozzle; 72. second air nozzle; 8. mud collecting device; 81. bottom plate; 811. first hole; 82. cover plate; 821. handle; 83. side plate; 831. second hole; 9. bracket; 91. top disc; 911. third connecting hole; 912; second bolt; 92. bottom disc. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] like Figure 1 As shown, the dredging device includes an air compressor 1, a slurry discharge pipe 2, an air supply pipe 3, a slurry blocking plate 5, an air nozzle 7, a mud collecting device 8, and a bracket 9. The air compressor 1 is placed on the ground, and the air compressor serves as an air source to provide compressed gas. The slurry discharge pipe 2 is placed vertically downward in the well pipe 4 along the well pipe 4. The two ends of the air supply pipe 3 are connected to the air compressor 1 and the air nozzle 7 respectively. The slurry discharge pipe 2 is sleeved on the outside of the air supply pipe 3, and a gap is left between the inner wall of the slurry discharge pipe 2 and the outer wall of the air supply pipe 3. The top end of the slurry discharge pipe 2 is fixedly connected to the top of the bracket 9, and the bottom end of the slurry discharge pipe 2 is located above the mud 6 at the bottom of the well. The air nozzle 7 is lower than the bottom end of the slurry discharge pipe 2. The slurry blocking plate 5 is fixedly connected to the bottom end of the slurry discharge pipe 2. The outer diameter of the slurry blocking plate 5 is slightly smaller than the inner diameter of the well pipe 4, so as to ensure that the slurry blocking plate 5 can move up and down in the well pipe 4. The inner diameter of the slurry blocking plate 5 is consistent with the slurry discharge pipe 2. The mud collecting device 8 is a hollow box structure made of stainless steel. The side plate 83 of the mud collecting device 8 is provided with a second hole 831. The air supply pipe 3 passes through the second hole 831 and enters the slurry discharge pipe 2. The bottom plate 81 of the mud collecting device 8 is provided with a first hole 811. The first hole 811 is sleeved on the outside of the well pipe 4 exposed to the ground. The bracket 9 is placed inside the mud collecting device 8. The air nozzle 7 is close to the mud at the bottom of the well and sprays high-pressure gas. Because the slurry blocking plate 5 seals the gap between the well pipe 4 and the slurry discharge pipe 2, the slurry can only surge up along the gap between the slurry discharge pipe 2 and the air supply pipe 3 under the action of the high-pressure gas, and is finally sent to the mud collecting device 8.

[0026] Specifically, Figure 2-4 As shown, the bracket 9 includes a top disc 91 and a bottom disc 92. The top disc (91) is a circular flange structure with four third connection holes 911 provided thereon. The bottom disc 92 is sleeved outside the well pipe 4 and placed on the bottom plate 81 of the mud collecting device 8. The bracket 9 is made of cast iron. Its main purpose is to fix the mud discharge pipe 2 and to press the mud collecting device 8 to prevent the mud collecting device 8 from being damaged due to the impact force of the discharged mud in the early stage of the mud discharge. A rotatable cover plate 82 is provided on the top of the mud collecting device 8, and a handle 821 is provided on the cover plate 82. The cover plate 82 can be opened and closed by the handle 821.

[0027] The slurry discharge pipe 2 is a stainless steel round pipe, 1-2 meters long, which can be spliced ​​with threads and is easy to disassemble. The first connecting ring 212 is fixedly connected to the top of the top slurry discharge pipe 21, and the first connecting ring 212 includes a first flange ring, a plurality of first connecting rods 213, and a first center ring. The first center ring is arranged at the center of the first flange ring, and the two ends of the first connecting rod 213 are respectively welded to connect the first flange ring and the first center ring. The first connecting rod 213 can be a section of steel bar, and the first center ring can also be bent into a ring with steel bar, and the two are welded and connected. Four first connecting holes 211 are provided on the first flange ring. The first connecting hole 211 is aligned with the third connecting hole 911 and then bolted, and the first flange ring 212 is connected to the top disc 91. The air supply pipe 3 passes through the center of the first center ring. The main purpose of the fixed connection between the first connecting ring 212 and the top disc 91 is to prevent the slurry discharge pipe 2 from shaking and falling when the overall weight increases.

[0028] The second connecting ring 222 is fixedly connected to the bottom end of the terminal slurry discharge pipe 22. The structure of the ring 212 is similar. The second connecting ring 222 includes a second flange ring, four second connecting rods 223, and a second center ring. The second flange ring is fixedly connected to the bottom end surface of the terminal slurry discharge pipe 22, and the second center ring is arranged at the center of the second flange ring. The second connecting rod 223 connected to the first can be a section of steel bar, and the second center ring can also be made by bending steel bars. The two ends of the second connecting rod 223 are welded to the second center ring and the second flange ring respectively. Four second connecting holes 221 are provided on the second flange ring, and the first bolt 51 passes through the second connecting hole 221 to fix the second flange ring and the slurry blocking plate 5 together. The air outlet pipe 3 extends through the center of the first center ring and the second center ring, with the purpose of limiting the air supply pipe 3 so that it does not swing back and forth in the slurry discharge pipe 2, ensuring the smooth discharge of mud, and has a simple structure, which can improve the stability of the device and the sludge cleaning efficiency.

[0029] The height of the air nozzle 7 should be lower than the height of the slurry discharge pipe 2 and the slurry blocking plate 5. The purpose is to allow the mud formed by the high-pressure gas to fully pass through the transportation channel between the slurry discharge pipe 2 and the air supply pipe 3. If it is higher than the position of the slurry discharge pipe 2 and the slurry blocking plate 5, part of the mud formed by the blowing will be blown to the bottom of the well by the air flow when it rushes up, affecting the smooth entry of the mud blown up into the transportation channel between the slurry discharge pipe 2 and the air supply pipe 3.

[0030] The air nozzle 7 includes a first air nozzle 71 and a second air nozzle 72. The angle between the air outlet of the first air nozzle 71 and the horizontal plane is an acute angle. The second air nozzle 72 is provided with multiple air outlets, each of which is perpendicular to the wall of the well pipe 4. When cleaning the mud skin on the inner wall of the well, the air nozzle 72 with air outlets arranged horizontally in multiple directions is selected; when cleaning the mud at the bottom of the well, the air nozzle 71 with oblique air blowing is replaced. The targeted air nozzle structure can greatly improve the overall effect of dredging.

[0031] The specific operation process of the utility model device of this application is as follows:

[0032] 1. Investigate and collect the construction data of the extraction well, and master the information such as the well depth, the location of the water filter pipe and the well diameter, so as to set the length of the slurry discharge pipe 2 and the air supply pipe 3. Use a water pump to extract the leachate in the extraction well and collect it properly. Clean the wellhead ground and keep it flat. Put the mud collection device 8 on the wellhead of the well pipe. The gap between the first hole 811 opened on the bottom plate and the outer wall of the well pipe 4 should not be too large, and it should be sealed with sealant or a sealing ring. Open the cover plate 82.

[0033] Second, first fix the end slurry discharge pipe 22 and the slurry blocking plate 5 with bolts 51, and put it into the well. In the process, the slurry discharge pipe 2 is spliced ​​section by section until it reaches the depth position that needs to be cleaned. Put the bracket 9 on the wellhead, the top disc 91 is level with the wellhead, and the bottom disc 92 is placed on the bottom plate 81 of the mud collection device 8. Fix the top slurry discharge pipe 21 and the top disc 91 of the bracket 9 with bolts 912.

[0034] 3. Connect one end of the air supply pipe 3 to the air compressor 1, and the other end first passes through the hole 831 on the side plate 83 of the mud collection device 8, and then connects to the air nozzle 7. At this time, the air nozzle structure adopts a second air nozzle 72 with multi-directional horizontal blowing. Put the end of the air supply pipe 3 connected to the second air nozzle through the first connecting ring 222 and the second connecting ring 212 into the well. The depth of the air nozzle 7 should be lower than the lowest end of the mud discharge pipe 2. Cover the top plate cover 82 of the mud collection device 8.

[0035] 4. Start the air compressor 1 and continuously input high-pressure gas into the well.

[0036] 5. Continue to lower the air supply pipe 3 to continuously blow and clean the mud on the inner wall of the well.

[0037] 6. When the mud on the inner wall of the filter pipe section in the well is cleaned, turn off the air compressor 1. Pull the air supply pipe 3 out of the slurry discharge pipe 2, and replace the air nozzle 7 with an oblique air nozzle 71. At the same time, increase the length of the slurry discharge pipe 2 until its lower end reaches the surface of the mud 6 at the bottom of the well. At this time, re-insert the end of the air supply pipe 3 connected with the air nozzle 7 through the slurry discharge pipe 2 and put it into the bottom of the well. Similarly, the position of the air nozzle 7 should be lower than the lowest end of the slurry discharge pipe 2.

[0038] 7. After being ready, restart the air compressor 1, and continue to deliver high-pressure gas into the well, which is sprayed out from the oblique air nozzle 71. The airflow generated by the high-pressure gas will blow up the sludge 6 at the bottom of the well. When the airflow passes through the gap between the slurry discharge pipe 2 and the air supply pipe 3, the blown-up sludge 6 at the bottom of the well will be carried up and delivered to the outlet of the slurry discharge pipe 2, and fall into the sludge collection device 8.

[0039] 8. After working for a period of time, open the upper cover of the mud collection device 8 and observe the discharge volume of the mud. When the discharge volume is small, turn off the air compressor 1, properly lower the mud discharge pipe 2 and the air supply pipe 3, start the air compressor 1 again, and start discharging the mud until the mud discharge pipe 2 no longer discharges the bottom mud 6 of the well, turn off the air compressor 1, and the dredging work is completed.

[0040] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A landfill leachate extraction shaft dredging device, characterized in that: The invention comprises an air compressor (1), a slurry discharge pipe (2), an air supply pipe (3), a slurry blocking plate (5), an air nozzle (7), a slurry collecting device (8), and a bracket (9); the air compressor (1) is placed on the ground, the two ends of the air supply pipe (3) are respectively connected to the air compressor (1) and the air nozzle (7), the air nozzle (7) and the air supply pipe (3) are detachably connected, the slurry discharge pipe (2) is sleeved and connected to the outside of the air supply pipe (3), a gap is left between the inner wall of the slurry discharge pipe (2) and the outer wall of the air supply pipe (3), the top end of the slurry discharge pipe (2) is fixedly connected to the top of the bracket (9), and the bottom end of the slurry discharge pipe (2) is located at the bottom of the well. The mud (6) is disposed above the mud, the air nozzle (7) is lower than the bottom end of the mud discharge pipe (2), the mud blocking plate (5) is detachably connected to the bottom end of the mud discharge pipe (2), the mud collection device (8) is a hollow box structure, the side plate (83) of the mud collection device (8) is provided with a second hole (831), the air supply pipe (3) passes through the second hole (831) and enters the mud discharge pipe (2), the bottom plate (81) of the mud collection device (8) is provided with a first hole (811), the first hole (811) is sleeved on the outside of the well pipe (4) exposed to the ground, and the bracket (9) is arranged inside the mud collection device (8).

2. A landfill leachate extraction shaft desilting device according to claim 1, characterized in that: The slurry discharge pipe (2) is divided into a plurality of sections, a first connecting ring (212) is fixedly connected to the top of the top slurry discharge pipe (21), the first connecting ring (212) is fixedly connected to the top of the bracket (9), a second connecting ring (222) is fixedly connected to the bottom of the terminal slurry discharge pipe (22), and the slurry blocking plate (5) is detachably connected to the second connecting ring (222).

3. A landfill leachate extraction shaft dredging device according to claim 2, characterized in that: The first connecting ring (212) comprises a first flange ring, a plurality of first connecting rods (213), and a first center ring. The first flange ring is fixedly connected to the top surface of the top slurry discharge pipe (21). The first center ring is arranged at the center of the first flange ring. The two ends of the first connecting rod (213) are respectively fixedly connected to the first flange ring and the first center ring. The first flange ring is fixedly connected to the top of the bracket (9).

4. A landfill leachate extraction shaft desilting device according to claim 2, characterized in that: The second connecting ring (222) comprises a second flange ring, a plurality of second connecting rods (223), and a second center ring; the second flange ring is fixedly connected to the bottom end surface of the terminal slurry discharge pipe (22); the second center ring is arranged at the center of the second flange ring; two ends of the second connecting rod (223) are respectively fixedly connected to the second center ring and the second flange ring; the second flange ring is detachably connected to the slurry blocking plate (5).

5. A landfill leachate extraction shaft desilting device according to claim 1, characterized in that: The air nozzle (7) comprises a first air nozzle (71), and the angle between the air outlet of the first air nozzle (71) and the horizontal plane is an acute angle.

6. A landfill leachate extraction shaft desilting device according to claim 1, characterized in that: The gas nozzle (7) comprises a second gas nozzle (72), wherein the second gas nozzle (72) is provided with a plurality of gas outlets, each gas outlet being perpendicular to the wall of the well pipe (4).

7. A landfill leachate extraction shaft desilting device according to claim 1, characterized in that: A rotatable cover plate (82) is provided on the top of the mud collection device (8), and a handle (821) is provided on the top of the cover plate (82).

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