A device for treating leachate from a heavy metal tailings pond

Abstract

The present invention discloses a heavy metal tailings pond leachate treatment device, specifically relating to the technical field of heavy metal leachate treatment, comprising a sewage inlet pipe for conveying leachate, the outlet of the sewage inlet pipe being provided with a homogenizing regulating tank, an electrochemical tank, an aeration tank, a sedimentation tank, and an ecological filtration tank for treating the leachate in sequence from top to bottom, a drainage cylinder being provided in the middle of the ecological filtration tank for discharging the treated leachate, the top of the drainage cylinder being passed through the sedimentation tank, the aeration tank, the electrochemical tank, and the homogenizing regulating tank in sequence from bottom to top, the bottom of the drainage cylinder being passed through the ecological filtration tank, and the treated leachate being discharged into the ground through the bottom of the drainage cylinder. The present invention, by providing a vertically distributed homogenizing regulating tank, an electrochemical tank, an aeration tank, a sedimentation tank, and an ecological filtration tank, utilizes the gravity of the leachate itself to make it flow in multiple tank cavities, thereby saving energy and reducing the operating cost of leachate treatment.

Description

Technical Field

[0001] The invention relates to the technical field of heavy metal leachate treatment, and more particularly to a heavy metal tailings pond leachate treatment device. Background Art

[0002] Heavy metal tailings ponds are sites where waste residues remain after metal ore mining and beneficiation. These tailings often contain significant quantities of heavy metals, such as lead, cadmium, mercury, and arsenic. If improperly handled, they can cause serious pollution to the surrounding environment and water sources. The primary function of a tailings pond is to temporarily store these waste residues for subsequent treatment and disposal. Leachate from a heavy metal tailings pond is the liquid left over from the mining and beneficiation processes. Heavy metal ions are activated by rainwater, surface runoff, and air in the tailings pond, and chemically react to enter the leachate as ions, causing persistent environmental pollution. This leachate often contains high concentrations of heavy metal ions, such as lead, cadmium, mercury, and arsenic. These heavy metals are difficult to degrade in the environment, and once they enter soil and water sources, they pose a serious threat to the ecological environment and human health.

[0003] Therefore, to ensure that the soil and water sources around the tailings pond are not contaminated by heavy metals, the existing technology has proposed physical and chemical treatment technologies including precipitation, filtration, adsorption, ion exchange, and other methods, microbial treatment technologies that utilize microbial metabolism, and membrane separation technologies that utilize the selective permeability of semipermeable membranes. These treatment technologies have been found to have their own advantages and disadvantages in actual use, and it has been found that the treatment effect achieved by a single treatment technology cannot meet the sewage discharge standards. For example, a multi-component ecological treatment system for leachate from a heavy metal tailings pond with prior art publication number CN105621819B is used to perform multi-component treatment on the leachate from the tailings pond by providing a homogenization regulating tank, a pH adjustment tank, an electrochemical equipment tank, an aeration tank, an inclined tube sedimentation tank, an artificial ecological filter bed, and an artificial ecological oxidation channel that are connected in sequence, thereby improving the water treatment effect. However, it is known that the circulation of sewage between multiple treatment pools requires the use of power equipment such as pumps. The more treatment pools set up in the existing technology CN105621819B, the more power equipment is required, and the larger the area required for the treatment pool, which leads to an increase in sewage treatment costs. At the same time, the added power equipment will further increase the energy consumption in the water treatment process, leading to an increase in sewage treatment operating costs. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a heavy metal tailings pond leachate treatment device. By setting up vertically distributed homogenization regulating tanks, electrochemical tanks, aeration tanks, sedimentation tanks and ecological filtration tanks, the gravity of the leachate itself is utilized to make it flow in multiple tank cavities, thereby saving energy consumption and reducing the operating cost of leachate treatment. At the same time, the vertical arrangement can also reduce the overall footprint of the present invention.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a heavy metal tailings pond leachate treatment device, comprising a sewage inlet pipe for conveying leachate, wherein the outlet of the sewage inlet pipe is provided with, from top to bottom, a homogenizing regulating tank, an electrochemical tank, an aeration tank, a sedimentation tank, and an ecological filtration tank for treating the leachate; a drainage cylinder is provided in the middle of the ecological filtration tank for discharging treated leachate, wherein the top end of the drainage cylinder passes through the sedimentation tank, the aeration tank, the electrochemical tank, and the homogenizing regulating tank in sequence from bottom to top, and the bottom end of the drainage cylinder passes through the ecological filtration tank, and the treated leachate is discharged into the ground through the bottom end of the drainage cylinder;

[0006] The homogeneous regulating tank, electrochemical tank, aeration tank, sedimentation tank, and ecological filtration tank are all annular tanks with top openings. The inner and outer diameters of the homogeneous regulating tank are the same as those of the electrochemical tank. The outer diameter of the aeration tank is equal to the inner diameter of the electrochemical tank. The inner and outer diameters of the aeration tank are the same as those of the sedimentation tank. The outer diameter of the ecological filtration tank is equal to the inner diameter of the sedimentation tank.

[0007] The homogenization regulating tank is located above the ground, and the electrochemical tank, aeration tank, sedimentation tank, and ecological filtration tank are all located below the ground. The leachate discharged from the sewage inlet pipe flows into the electrochemical tank, aeration tank, sedimentation tank, and ecological filtration tank in sequence under the action of its own gravity for treatment.

[0008] In a preferred embodiment, a partition is fixed in the pool cavity of the homogeneous regulating tank, and the partition divides the pool cavity of the homogeneous regulating tank into an upper chamber and a lower chamber distributed vertically. The upper chamber and the lower chamber are connected by a U-shaped tube. A pH meter for detecting the pH value of the leachate in the upper chamber is installed on the outer wall of the upper chamber. When the solenoid valve at the outer end of the U-shaped tube is closed, a pH regulating drug is added to the upper chamber to make the leachate weakly alkaline;

[0009] The homogeneous regulating tank is provided with a stirring element for stirring the pH regulating drug and the leachate, and a drain pipe a is provided on one side of the inner wall of the homogeneous regulating tank. The top end of the drain pipe a is connected to the upper cavity, and the bottom end of the drain pipe a is connected to the inside of the electrochemical cell, which is used to introduce the adjusted leachate into the electrochemical cell.

[0010] In a preferred embodiment, the sewage inlet pipe includes multiple outlets and two inlets, the multiple outlets are arranged at the top of the homogeneous regulating tank, and the two inlets are respectively arranged on both sides of the homogeneous regulating tank, for extracting leachate from two locations simultaneously;

[0011] The stirring member includes a plurality of stirring shafts movably mounted inside the homogenizing regulating tank through sealed bearings, the bottom ends of the stirring shafts sequentially pass through the partition and the bottom wall of the homogenizing regulating tank and extend to the bottom of the homogenizing regulating tank, the stirring shafts and the partitions are movably connected through sealed bearings, a plurality of groups of stirring blades are fixed to the outer wall of each stirring shaft, one group of stirring blades is located in the lower cavity, and the plurality of stirring shafts are divided into a plurality of groups in pairs, and a turbine is fixed to the top end of the stirring shaft located on the outside of each group, and the turbine is movably mounted on the outlet of the sewage inlet pipe through a bracket, a gear a is fixed to the bottom end of the stirring shaft, a gear ring a is engaged with one side of the gear a, and the gear ring a is movably arranged at the bottom of the homogenizing regulating tank through a slide rail, a plurality of gears b arranged side by side are provided inside the gear ring a, and two adjacent gears b are engaged, the inner wall of the gear ring a is engaged with one of the gears b, and the gear b located on the inside is fixed to the bottom end of the stirring shaft located on the inside of each group, for driving the two stirring shafts in each group to rotate in opposite directions.

[0012] In a preferred embodiment, a plate support is fixed at the bottom of the electrochemical cell, and a plurality of plates are fixed on the top of the plate support. The number of the plate supports is even, wherein the plates arranged in odd positions are connected to the negative electrode of the external power supply through a wire, and the plates arranged in even positions are connected to the positive electrode of the external power supply through a wire, for electrolyzing the leachate flowing into the electrochemical cell;

[0013] Two drainage pipes b are fixed on the bottom wall of the electrochemical cell. The drainage pipes b connect the electrochemical cell and the aeration tank and are used to guide the leachate after electrolysis treatment into the aeration tank.

[0014] In a preferred embodiment, both sides of the aeration tank are fixedly connected with water inlet pipes, and a guide plate inclined toward the aeration tank is fixed on the top of each water inlet pipe. The leachate entering the water inlet pipe through the drain pipe b flows into the aeration tank along the inclined surface of the guide plate.

[0015] The bottom end of the aeration tank cavity is provided with a plurality of cyclone aerators, and above the cyclone aerators is provided a stirring plate for stirring the leachate, and the stirring plate is driven by a stirring plate driving member to rotate inside the aeration tank cavity. The outer wall of the aeration tank is installed with a liquid level gauge for monitoring the liquid level inside the aeration tank and two drainage pipes C for connecting the aeration tank and the sedimentation tank. The leachate after aeration treatment in the aeration tank flows into the sedimentation tank through the drainage pipes C.

[0016] The stirring plate driving component includes a gear ring b fixed to the two stirring plates, the bottom of the gear ring b is movably connected to the support platform a through a slide rail, the outer wall of the support platform a is fixed to the inner wall of the aeration tank, a gear c is meshed inside the gear ring b, a rotating shaft a is fixed in the middle of the gear c, the bottom end of the rotating shaft a passes through the support platform a, and the rotating shaft a is movably connected to the support platform a through a bearing.

[0017] In a preferred embodiment, a diversion ramp is fixed to the bottom of the pool cavity of the sedimentation tank. The vertical cross-section of the diversion ramp is triangular, and the hypotenuse of the triangle is inclined toward the circle. Two mud discharge pipes arranged side by side are fixed to the inside of the sedimentation tank. One end of the two mud discharge pipes is connected to the interior of the sedimentation tank, and the other end of the two mud discharge pipes is fixed to a conveyor b. The outlet at the top of the conveyor b is provided with a conveyor c;

[0018] The top of the diversion ramp is provided with two scrapers that match the inclined surface of the top of the diversion ramp, and the scrapers are driven by scraper driving members to rotate forward and backward in the pool cavity of the diversion ramp. Cone buckets are fixed on both sides of the bottom of the sedimentation tank, and the bottom end of the cone bucket is connected to a return pipe. The outlet of the return pipe is connected to a conveyor a, and the outlet of the conveyor a is connected to the water inlet pipe. The biomass sludge in the sedimentation tank is transported to the inside of the aeration tank through the conveyor a. The bottom of the diversion ramp and the position of the diversion ramp corresponding to the cone bucket are provided with a through hole connected to the inside of the cone bucket. There are two through holes in total, and the two through holes are respectively provided on both sides of the pool cavity of the sedimentation tank. The two scrapers are respectively located on one side of the through hole, and the biomass sludge is pushed from the through hole into the cone bucket by the rotating scraper;

[0019] A plurality of drainage pipes d are fixed on the inner wall of the sedimentation tank, and the drainage pipes d are connected to the sedimentation tank and the ecological filtration tank, and the upper layer of liquid after sedimentation in the sedimentation tank is introduced into the ecological filtration tank through the drainage pipes d;

[0020] The scraper driving component includes a support platform b fixed to the inner wall of the sedimentation tank, and a rotating shaft b is movably connected to one side of the top of the support platform b through a bearing, and the bottom end of the rotating shaft a is movably connected to the other side of the top of the support platform b through a bearing, and a gear d is fixed to the top of the rotating shaft b and the bottom end of the rotating shaft a, and the two gears d are externally engaged with the same gear ring c, and the gear ring c is movably installed on the top of the support platform b through a slide rail, and the outer wall of the gear ring c is fixed to the scraper, and a driving motor is provided at the bottom end of the rotating shaft b to drive the gear d at the outer end of the rotating shaft b to rotate forward and reverse, and the scraper is rotated by driving the gear ring c through the rotating gear d, and the rotation angle of the gear d in each direction is 180°.

[0021] In a preferred embodiment, a filter plate is fixed below the pool cavity of the ecological filtration pool, and an ecological filter bed is provided on top of the filter plate. The ecological filter bed includes, from top to bottom, a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer, and a coarse sand layer, and emergent plants are planted above the soil layer.

[0022] A plurality of drainage pipes e for drainage are fixed at the bottom of the ecological filtration pool. One end of the drainage pipe e is connected to the bottom of the pool cavity of the ecological filtration pool, and the other end of the drainage pipe e extends into the drainage cylinder to discharge the treated water into the drainage cylinder.

[0023] In a preferred embodiment, the drainage cylinder includes a water funnel fixed at the bottom end of the drainage cylinder, a blocking ball is provided at the bottom outlet of the water funnel, and a hanging rope b is fixed to the top of the blocking ball;

[0024] The outer wall of the bottom end of the drainage barrel is provided with a plurality of filter holes, and filter meshes are embedded in the filter holes to prevent underground soil from entering the interior of the drainage barrel.

[0025] In a preferred embodiment, a blocking platform is provided at the bottom outlet of the cone bucket, and the blocking platform is used to block the outlet. A lifting rope a is fixed on the top of the blocking platform. The end of the lifting rope a away from the blocking platform and the end of the lifting rope b away from the blocking ball are both provided with a rope winding mechanism. The lifting rope a and the lifting rope b are respectively wound up by the rope winding mechanism to drive the blocking platform and the blocking ball to move upward.

[0026] In a preferred embodiment, the top of the outer wall of the homogenizing regulating tank, the top of the outer wall of the electrochemical tank, the top of the outer wall of the aeration tank, the top of the outer wall of the sedimentation tank, and the top of the outer wall of the ecological filtration tank are all fixed with steel structure platforms for convenient movement of personnel, and stairs are provided between the upper and lower steel structure platforms for connecting the adjacent upper and lower steel structure platforms;

[0027] A sampling tube is fixed on the inner wall of the drainage tube, and a sampling platform for connecting to a steel structure platform outside the homogenization regulating tank is provided on one side of the top of the drainage tube.

[0028] The technical effects and advantages of the present invention are as follows:

[0029] In response to the problem of high cost of leachate treatment in existing heavy metal tailings ponds, the present invention sets up vertically distributed homogenization regulating tanks, electrochemical tanks, aeration tanks, sedimentation tanks and ecological filtration tanks for the first time, and utilizes the gravity of the leachate itself to make it flow in multiple pool cavities distributed vertically, saving energy, reducing energy consumption, and lowering the operating cost of leachate treatment.

[0030] 2. The present invention cleverly adopts a staggered arrangement of the aeration tank, electrochemical tank, ecological filtration tank, and sedimentation tank by reducing the outer diameter. This allows the present invention to reduce the overall footprint of the equipment while also meeting the design of the top openings of the exposed aeration tank and ecological filtration tank, thereby meeting the aeration process in the aeration tank and the growth of emergent plants in the ecological filtration tank for oxygen and light, achieving two goals at one stroke.

[0031] 3. The present invention utilizes the kinetic potential energy of the leachate discharged from the sewage inlet pipe to drive the stirring blades in the homogenization regulating tank to rotate, so as to stir the leachate and pH regulating drugs in the homogenization regulating tank to make them evenly mixed, further saving energy consumption and reducing the operating cost of leachate treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a first view of the overall structure of the present invention;

[0034] Figure 2 A second view of the overall structure of the present invention;

[0035] Figure 3 It is a cross-sectional view of the homogenizing regulating tank, electrochemical tank, aeration tank, sedimentation tank, ecological filtration tank and drainage pipe of the present invention;

[0036] Figure 4 A perspective view of the present invention;

[0037] Figure 5 A top view of the homogenizing regulating tank and the stirring element of the present invention;

[0038] Figure 6 Schematic diagram of the structure of the gear a, gear ring a and homogenizing regulating tank of the present invention;

[0039] Figure 7 is a cross-sectional view of the homogeneous regulating tank of the present invention;

[0040] Figure 8 is a cross-sectional view of an electrochemical cell of the present invention;

[0041] Figure 9 It is a structural schematic diagram of the aeration tank and two stirring plates of the present invention;

[0042] Figure 10 This is a schematic diagram of the bottom structure of the aeration tank of the present invention;

[0043] Figure 11 It is a structural schematic diagram of the sedimentation tank and the rotating shaft a of the present invention;

[0044] Figure 12 It is a cross-sectional view of the sedimentation tank and cone bucket of the present invention.

[0045] The accompanying drawings are:

[0046] 1. Homogenizing tank; 11. Partition; 12. U-shaped tube; 13. Stirring element; 14. pH meter; 15. Drain pipe a;

[0047] 131. Turbine; 132. Stirring shaft; 133. Stirring blade; 134. Gear a; 135. Ring gear a; 136. Gear b;

[0048] 2. Electrochemical cell; 21. Plate; 22. Plate support; 23. Drain pipe b;

[0049] 3. Aeration tank; 31. Water inlet pipe; 32. Stirring plate; 33. Stirring plate drive; 34. Drain pipe c; 35. Liquid level gauge; 36. Guide plate; 37. Cyclone aerator;

[0050] 331, ring gear b; 332, gear c; 333, rotating shaft a; 334, support platform a;

[0051] 4. Sedimentation tank; 41. Diversion ramp; 42. Scraper; 43. Cone bucket; 44. Blocking platform; 45. Return pipe; 46. Conveyor a; 47. Scraper drive; 48. Drain pipe d; 49. Mud discharge pipe; 410. Conveyor b; 411. Conveyor c; 412. Lifting rope a;

[0052] 471, gear d; 472, rotating shaft b; 473, ring gear c; 474, support platform b;

[0053] 5. Ecological filter pool; 51. Ecological filter bed; 52. Filter plate; 53. Drain pipe e;

[0054] 6. Drainage cylinder; 61. Funnel; 62. Sealing ball; 63. Lifting rope b; 64. Filter hole; 65. Sampling tube; 66. Sampling platform;

[0055] 7. Steel structure platform;

[0056] 8. Stairs;

[0057] 9. Sewage enters the pipe. DETAILED DESCRIPTION

[0058] 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.

[0059] Refer to the instruction manual Figure 1-4The present invention provides a heavy metal tailings pond leachate treatment device, including a sewage inlet pipe 9 for conveying leachate, and the outlet of the sewage inlet pipe 9 is provided with a homogenizing regulating tank 1, an electrochemical tank 2, an aeration tank 3, a sedimentation tank 4, and an ecological filtration tank 5 for treating the leachate from top to bottom. The homogenizing regulating tank 1, the electrochemical tank 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 are all annular grooves with top openings. The top opening helps the staff to observe the liquid in the tank and also facilitates the leachate to flow into each tank.

[0060] At the same time, in order to facilitate the staff to check the treatment status of the leachate in the homogeneous regulating tank 1, the electrochemical tank 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5, the present invention fixes a steel structure platform 7 for convenient movement of personnel at the top of the outer wall of each homogeneous regulating tank 1, the top of the outer wall of the electrochemical tank 2, the top of the outer wall of the aeration tank 3, the top of the outer wall of the sedimentation tank 4, and the top of the outer wall of the ecological filtration tank 5. A staircase 8 is provided between the upper and lower steel structure platforms 7, and the staff can shuttle back and forth between the multiple steel structure platforms 7 via the staircase 8.

[0061] The sewage inlet pipe 9 in the present invention includes multiple outlets and two water inlets. The multiple outlets are all arranged at the top of the homogeneous regulating tank 1, and the two water inlets are respectively arranged on both sides of the homogeneous regulating tank 1, for extracting leachate from two positions at the same time. The leachate extracted through the two water inlets of the sewage inlet pipe 9 will flow into the homogeneous regulating tank 1 through the outlet, and then the leachate will be treated in sequence by the homogeneous regulating tank 1, the electrochemical tank 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5. In addition, a drainage tube 6 for discharging the treated leachate is provided in the middle of the ecological filtration tank 5. The top of the drainage tube 6 passes through the sedimentation tank 4, the aeration tank 3, the electrochemical tank 2 and the homogeneous regulating tank 1 from bottom to top, and the bottom end of the drainage tube 6 passes through the ecological filtration tank 5. The treated leachate flows into the inside of the drainage tube 6 through the ecological filtration tank 5, and then is discharged into the ground through the bottom end of the drainage tube 6. Directly discharging the treated water into the ground can also help avoid water flow from eroding the surface soil of the ground, thereby reducing soil loss and benefiting environmental protection.

[0062] During the leachate treatment process, the homogenizing regulating tank 1 is mainly used to homogenize the leachate and adjust the pH value of the leachate. In the present invention, a partition 11 is fixed in the tank cavity of the homogenizing regulating tank 1. The partition 11 divides the tank cavity of the homogenizing regulating tank 1 into an upper cavity and a lower cavity distributed up and down. A pH meter 14 for detecting the pH value of the leachate in the upper cavity is installed on the outer wall of the upper cavity. When the solenoid valve at the outer end of the U-shaped tube 12 is closed, a pH regulating drug is added to the upper cavity through the top opening of the homogenizing regulating tank 1 to make the leachate weakly alkaline, thereby achieving the purpose of adjusting the pH value of the leachate.

[0063] Furthermore, in order to uniformly mix the pH regulating drug with the leachate, the present invention provides a stirring member 13 for stirring the pH regulating drug and the leachate inside the homogenizing regulating tank 1. Specifically, Figure 5-7 As shown, the stirring member 13 includes a plurality of stirring shafts 132 movably mounted inside the homogenizing regulating tank 1 through sealed bearings. The bottom ends of the stirring shafts 132 sequentially penetrate the partition 11 and the bottom wall of the homogenizing regulating tank 1 and extend to the bottom of the homogenizing regulating tank 1. The stirring shafts 132 are movably connected to the partition 11 through sealed bearings. A plurality of groups of stirring blades 133 are fixed to the outer wall of each stirring shaft 132, one of which is located in the lower cavity. The plurality of stirring shafts 132 are divided into a plurality of groups in pairs, and the tops of the stirring shafts 132 located on the outside of each group are fixed. There is a turbine 131, which is movably mounted at the outlet of the sewage inlet pipe 9 through a bracket. The leachate discharged through the outlet of the sewage inlet pipe 9 has its own dynamic potential energy. The outflowing leachate will flush the turbine 131, which can drive the turbine 131 to rotate. The rotating turbine 131 can drive the stirring shaft 132 located on the outside and the stirring blade 133 at the outer end of the stirring shaft 132 to rotate. The rotating stirring blade 133 can stir the leachate in the homogenizing regulating tank 1 from one direction so that it is evenly mixed with the pH regulating drug. In order to improve the mixing and regulating effect, a gear a134 is fixed to the bottom of the stirring shaft 132, and a gear ring a135 is engaged on one side of the gear a134. The gear ring a135 is movably mounted at the bottom of the homogenizing regulating tank 1 through a slide rail. A plurality of gears b136 are arranged side by side inside the gear ring a135 (to ensure that the rotation directions of the stirring shaft 132 are opposite, the number of gears b136 is set to an odd number. Specifically, in this embodiment, there are three gears b136. Figure 7 As shown), two adjacent gears b136 are meshed, the inner wall of the gear ring a135 is meshed with one of the gears b136, and the inner gear b136 is fixed to the bottom end of the stirring shaft 132 located on the inner side of each group. The stirring shaft 132 driven by the flowing leachate can also drive the inner stirring shaft 132 to rotate in the opposite direction through the gear a134, the gear ring a135 and the gear b136 meshed at the bottom end. That is, the stirring shaft 132 located on the inner side can drive the stirring blade 133 at its outer end to stir the leachate from another direction. The two stirring modes in different directions can further promote the mixing of the pH regulating drug and the leachate, thereby improving the regulating effect of the pH regulating drug on the leachate in the present invention.

[0064] The upper chamber and the lower chamber in the present invention are connected through a U-shaped tube 12. When the pH meter 14 detects that the leachate in the upper chamber of the homogenizing regulating tank 1 is weakly alkaline, the solenoid valve at the outer end of the U-shaped tube 12 can be opened by an external controller, so that the leachate in the upper chamber can flow into the lower chamber through the U-shaped tube 12 for temporary storage. At the same time, the present invention is provided with a drain pipe a15 on one side of the inner wall of the homogenizing regulating tank 1. The top end of the drain pipe a15 is connected to the upper chamber, and the bottom end of the drain pipe a15 is connected to the inside of the electrochemical cell 2. Then, the controller opens the solenoid valve at the outer end of the drain pipe a15, so that the leachate temporarily stored in the lower chamber can flow into the electrochemical cell 2 through the drain pipe a15.

[0065] Next, the present invention utilizes electrochemical cell 2 to electrolyze the leachate, such as Figure 3 As shown, a plate support 22 is fixed at the bottom of the electrochemical cell 2, and a plurality of plates 21 are fixed on top of the plate support 22. The number of plate supports 22 is even, wherein the plates 21 in odd positions are connected to the negative pole of the external power supply via wires, and the plates 21 in even positions are connected to the positive pole of the external power supply via wires. These plates are used to electrolyze the leachate flowing into the electrochemical cell 2. The electrolytic treatment can remove heavy metals in the leachate. During the electrolysis process, heavy metal ions undergo redox reactions at the anode or cathode, converting them into low-valent or high-valent metal ions, or directly forming water-insoluble metal oxide or hydroxide precipitates, thereby achieving the initial removal of heavy metals.

[0066] like Figure 8 As shown, two drain pipes b23 are fixed on the bottom wall of the electrochemical cell 2. The drain pipes b23 connect the electrochemical cell 2 and the aeration tank 3. After the leachate is electrolytically treated, the controller opens the solenoid valve at the outer end of the drain pipe b23, so that the treated leachate in the electrochemical cell 2 can flow into the aeration tank 3 through the drain pipe b23 for the next step of treatment.

[0067] Then, the aeration tank 3 performs aeration treatment on the leachate, such as Figure 3 、 Figure 12 As shown, the present invention is fixedly connected with water inlet pipes 31 on both sides of the aeration tank 3, and a guide plate 36 inclined toward the aeration tank 3 is fixed on the upper part of each water inlet pipe 31. The leachate entering the water inlet pipe 31 through the drainage pipe b23 will flow into the aeration tank 3 along the inclined surface of the guide plate 36. A plurality of cyclone aerators 37 are provided at the bottom end of the pool cavity of the aeration tank 3, and a stirring plate 32 for stirring the leachate is provided above the cyclone aerator 37. Sufficient dissolved oxygen is provided in the leachate treatment through the cyclone aerator 37 to support the growth and metabolic activities of aerobic microorganisms, thereby improving the degradation efficiency of microorganisms for pollutants, promoting the conversion of heavy metals into a form that is easy to remove, and realizing the re-removal of heavy metals in the leachate.

[0068] During the aeration process, the stirring plate 32 is driven by the stirring plate driving member 33 to rotate inside the aeration tank 3, further increasing the dissolved oxygen in the leachate. Figure 2 As shown, the present invention has a level gauge 35 for monitoring the liquid level height inside the aeration tank 3 and two drain pipes c34 for connecting the aeration tank 3 and the sedimentation tank 4 installed on the outer wall of the aeration tank 3. The outer ends of the drain pipes c34 are equipped with solenoid valves. After the aeration treatment is completed, the external controller will control the solenoid valves at the outer ends of the drain pipes c34 to open, so that the leachate after aeration treatment in the aeration tank 3 can flow into the sedimentation tank 4 through the drain pipes c34 for sedimentation to separate the liquid and biomass sludge.

[0069] like Figure 3 、 11 As shown in Figure 12, a diversion ramp 41 is fixed at the bottom of the pool cavity of the sedimentation tank 4. The vertical section of the diversion ramp 41 is a triangle, and the hypotenuse of the triangle is inclined toward the circle. Two mud discharge pipes 49 arranged side by side are fixed on the inside of the sedimentation tank 4. One end of the two mud discharge pipes 49 is connected to the interior of the sedimentation tank 4, and the other end of the two mud discharge pipes 49 is fixed with a conveyor b410. The outlet of the top of the conveyor b410 is provided with a conveyor c411. After sedimentation, the settled sludge can be discharged through the mud discharge pipe 49, the conveyor b410 and the conveyor c411, so as to facilitate the harmless treatment of the sludge.

[0070] The sludge can also be recycled before being discharged. The present invention provides two scrapers 42 on the top of the diversion ramp 41, which are consistent with the inclined surface of the top of the diversion ramp 41. Cone buckets 43 are fixed on both sides of the bottom of the sedimentation tank 4. The bottom end of the cone bucket 43 is connected to a return pipe 45. The outlet of the return pipe 45 is connected to a conveyor a46. The outlet of the conveyor a46 is connected to the water inlet pipe 31. The scraper 42 is driven by a scraper driving member 47 to rotate forward and backward in the pool cavity of the diversion ramp 41.

[0071] Through holes connected to the interior of the cone hopper 43 are opened at the bottom of the diversion ramp 41 and at the position of the cone hopper 43 on the diversion ramp 41. There are two through holes, which are respectively arranged on both sides of the pool cavity of the sedimentation tank 4. The two scrapers 42 are respectively located on one side of the through holes. The rotating scrapers 42 push the biomass sludge from the through holes into the cone hopper 43, and then enter the inside of the blocking platform 44 through the return pipe 45, and are transported back to the inside of the water inlet pipe 31 by the blocking platform 44. In the above process, the leachate flowing to the top of the guide plate 36 through the drainage pipe b23 contacts the sludge transported back to the inside of the water inlet pipe 31, and can simultaneously flush the sludge, so that the sludge is fully in contact with the leachate, so as to improve the removal effect of the microorganisms in the sludge on the heavy metals in the leachate.

[0072] The present invention provides a blocking platform 44 at the bottom outlet of the cone bucket 43, which is used to block the outlet. A suspension rope a412 is fixed to the top of the blocking platform 44. A rope reeling mechanism is provided at one end of the suspension rope a412 away from the blocking platform 44. The rope reeling mechanism reels the suspension rope a412 to drive the blocking platform 44 upward. The position of the blocking platform 44 during the sedimentation process is as follows: Figure 3 As shown, the blocking platform 44 at this position can just block the outlet at the bottom of the cone hopper 43, so that the leachate with silt can stay in the sedimentation tank 4 for sedimentation. Only when the silt needs to be discharged back into the aeration tank 3, it is necessary to use the winding mechanism to lift the blocking platform 4 upward to open the opening at the bottom of the cone hopper 43.

[0073] The specific structure of the stirring plate driving member 33 in the present invention is as follows Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown, the stirring plate driving member 33 includes a gear ring b331 fixed to the two stirring plates 32, the bottom of the gear ring b331 is movably connected to the support platform a334 through a slide rail, the outer wall of the support platform a334 is fixed to the inner wall of the aeration tank 3, a gear c332 is meshed inside the gear ring b331, a rotating shaft a333 is fixed in the middle of the gear c332, the bottom end of the rotating shaft a333 passes through the support platform a334, the rotating shaft a333 and the support platform a334 are movably connected through a bearing, the scraper driving member 47 includes a support platform b474 fixed to the inner wall of the sedimentation tank 4, one side of the top of the support platform b474 is movably connected to the rotating shaft b472 through a bearing, the bottom end of the rotating shaft a333 is movably connected to the other side of the top of the support platform b474 through a bearing, the top of the rotating shaft b472 and the rotating shaft a333 are movably connected. 3 are fixed with gears d471 at the bottom, and the two gears d471 are meshed with the same ring gear c473 on the outside. The ring gear c473 is movably mounted on the top of the support platform b474 through a slide rail. The outer wall of the ring gear c473 is fixed to the scraper 42. The bottom end of the rotating shaft b472 is provided with a driving motor that drives the gear d471 at the outer end of the rotating shaft b472 to rotate forward and reverse. The rotating gear d471 drives the ring gear c473 to drive the scraper 42 to rotate. The rotation angle of the gear d471 in each direction is 180°. The rotating gear d471 can simultaneously drive the rotating shaft a333 to rotate synchronously. The present invention can further save energy consumption and reduce operating costs by driving the scraper 42 in the sedimentation tank 4 to rotate the scraper driving member 47 to rotate and simultaneously driving the stirring plate driving member 33 to rotate.

[0074] The present invention has a plurality of drain pipes d48 fixed on the inner wall of the sedimentation tank 4, such as Figure 3 and Figure 12As shown, the drain pipe d48 connects the sedimentation tank 4 and the ecological filter tank 5. An electromagnetic valve is fixed at the outer end of the drain pipe d48. After the leachate is precipitated, the solid and liquid are separated. The liquid will pass through the drain pipe d48 to introduce the upper layer of liquid after precipitation in the sedimentation tank 4 into the ecological filter tank 5 for the next step of treatment.

[0075] Finally, the present invention treats the leachate by simulating a natural wetland through an ecological filter pool 5, specifically as follows Figure 3 As shown, a filter plate 52 is fixed under the pool cavity of the ecological filtration pool 5, and an ecological filter bed 51 is provided on the top of the filter plate 52. The ecological filter bed 51 includes a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer and a coarse sand layer from top to bottom. Emergent plants are planted above the soil layer. The fine sand layer, fly ash layer, gravel layer, filler layer and coarse sand layer provided in the present invention can filter the leachate. At the same time, the minerals and plant residues in the filter material can react chemically with heavy metal ions, such as ion exchange, coprecipitation, etc., to further fix and remove heavy metals. Moreover, the roots of the planted emergent plants and the microbial communities can adsorb and detoxify heavy metals through their biochemical processes, and convert them into less toxic forms or stable forms, thereby reducing the bioavailability and environmental risks of heavy metals.

[0076] A plurality of drainage pipes e53 for drainage are fixed at the bottom of the ecological filter pool 5. Figure 3 and Figure 7 As shown, one end of the drainage pipe e53 is connected to the bottom of the pool cavity of the ecological filter pool 5, and the other end of the drainage pipe e53 extends into the interior of the drainage tube 6. The treated water will be discharged into the interior of the drainage tube 6 through the drainage pipe e53. A plurality of filter holes 64 are opened on the outer wall of the bottom end of the drainage tube 6, and a filter mesh is embedded in the filter hole 64 to prevent underground soil from entering the interior of the drainage tube 6.

[0077] Moreover, a funnel 61 is fixed at the bottom end of the drainage tube 6, and a sealing ball 62 is provided at the bottom outlet of the funnel 61. A hanging rope b63 is fixed on the top of the sealing ball 62, and a rope winding mechanism is provided at the end of the hanging rope b63 away from the sealing ball 62. By winding the hanging rope b63 by the rope winding mechanism, the sealing ball 62 can be driven to move upward. At this time, the opening at the bottom end of the funnel 61 is opened, and the treated leachate will be directly discharged into the ground through the filter hole 64 at the bottom end of the drainage tube 6. This method can reduce the erosion of the surface soil.

[0078] When the blocking ball 62 blocks the bottom outlet of the funnel 61, the water flowing out of the drain pipe e53 will gather inside the funnel 61. In order to detect whether the treated water inside the funnel 61 meets the standards, Figure 7As shown, a sampling tube 65 is fixed on the inner wall of the drain tube 6. The diameter of the sampling tube 65 is small, and the bottom end of the sampling tube 65 is inserted into the water at the bottom of the funnel 61. Based on the principle of capillary rise, the water at the bottom of the funnel 61 will rise along the sampling tube 65 to a height flush with the top of the drain tube 6. At this time, in order to facilitate the collection of water inside the sampling tube 65, a sampling platform 66 for connecting to the steel structure platform 7 on the outside of the homogenization regulating tank 1 is provided on one side of the top of the drain tube 65. The sampling personnel can move to the vicinity of the sampling tube 65 through the steel structure platform 7 and the sampling platform 66 on the outside of the homogenization regulating tank 1 to take samples for subsequent testing to ensure that the water treated by the present invention meets the standards.

[0079] Under the action of the electrochemical cell 2, the aeration tank 3 and the ecological filtration tank 5, the present invention realizes multiple treatments of heavy metals in the leachate by adopting different technical means, ensuring that the final discharged water flow can meet the regulations and will not cause pollution to the environment.

[0080] The present invention cleverly arranges the distribution of the homogenizing regulating tank 1, the electrochemical tank 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5, and utilizes a vertical distribution method to help reduce the floor space of the present invention. The homogenizing regulating tank 1 is located above the ground, and the electrochemical tank 2, the aeration tank 3, the sedimentation tank 4, and the ecological filtration tank 5 are all located below the ground, so that the treated water flow can be directly discharged into the ground, which can prevent the discharged water flow from eroding the surface soil and causing soil erosion.

[0081] The leachate discharged from the sewage inlet pipe 9 flows into the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filter tank 5 in sequence under the action of its own gravity for treatment. The liquid is driven to flow in the electrochemical cell 2, the aeration tank 3, the sedimentation tank 4, and the ecological filter tank 5 by the liquid's own gravity. On the one hand, it can save the investment in power equipment such as pumps and reduce the investment cost of leachate treatment. On the other hand, it can also reduce the operating cost of leachate treatment.

[0082] Moreover, in the present invention, the inner and outer diameters of the homogenizing regulating tank 1 are the same as those of the electrochemical tank 2, the outer diameter of the aeration tank 3 is equal to the inner diameter of the electrochemical tank 2, the inner and outer diameters of the aeration tank 3 are the same as those of the sedimentation tank 4, and the outer diameter of the ecological filter tank 5 is equal to the inner diameter of the sedimentation tank 4, so that the openings of the aeration tank 3 and the openings of the ecological filter tank 5 can be exposed to the air, so that the present invention can meet the requirements of vertical distribution to reduce the footprint while also meeting the aeration requirements of the aeration tank 3 and the oxygen requirements of the growth of emergent plants in the ecological filter tank 5. The design is ingenious and worthy of promotion.

[0083] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A heavy metal tailings pond leachate treatment device, comprising a sewage inlet pipe (9) for conveying leachate, characterized in that: The outlet of the sewage inlet pipe (9) is provided with a homogenizing regulating tank (1), an electrochemical tank (2), an aeration tank (3), a sedimentation tank (4), and an ecological filter tank (5) for treating leachate in sequence from top to bottom. A drainage cylinder (6) for discharging treated leachate is provided in the middle of the ecological filter tank (5). The top of the drainage cylinder (6) passes through the sedimentation tank (4), the aeration tank (3), the electrochemical tank (2), and the homogenizing regulating tank (1) in sequence from bottom to top. The bottom of the drainage cylinder (6) passes through the ecological filter tank (5). The treated leachate is discharged into the ground through the bottom of the drainage cylinder (6). The homogenizing regulating tank (1), electrochemical tank (2), aeration tank (3), sedimentation tank (4), and ecological filtration tank (5) are all annular grooves with top openings. The inner and outer diameters of the homogenizing regulating tank (1) are the same as the inner and outer diameters of the electrochemical tank (2). The outer diameter of the aeration tank (3) is equal to the inner diameter of the electrochemical tank (2). The inner and outer diameters of the aeration tank (3) are the same as the inner and outer diameters of the sedimentation tank (4). The outer diameter of the ecological filtration tank (5) is equal to the inner diameter of the sedimentation tank (4). The homogenizing regulating tank (1) is located above the ground, and the electrochemical tank (2), aeration tank (3), sedimentation tank (4), and ecological filtration tank (5) are all located below the ground. Leachate discharged from the sewage inlet pipe (9) flows into the electrochemical tank (2), aeration tank (3), sedimentation tank (4), and ecological filtration tank (5) in sequence under the action of its own gravity for treatment; A partition (11) is fixed in the tank cavity of the homogeneous regulating tank (1), and the partition (11) divides the tank cavity of the homogeneous regulating tank (1) into an upper cavity and a lower cavity distributed vertically. The upper cavity and the lower cavity are connected through a U-shaped tube (12). A pH meter (14) for detecting the pH value of the leachate in the upper cavity is installed on the outer wall of the upper cavity. When the electromagnetic valve at the outer end of the U-shaped tube (12) is closed, a pH regulating drug is added to the upper cavity to make the leachate weakly alkaline; The homogeneous regulating tank (1) is provided with a stirring element (13) for stirring the pH regulating drug and the leachate. A drainage pipe a (15) is provided on one side of the inner wall of the homogeneous regulating tank (1). The top end of the drainage pipe a (15) is connected to the upper cavity, and the bottom end of the drainage pipe a (15) is connected to the inside of the electrochemical cell (2) for introducing the regulated leachate into the electrochemical cell (2).

2. A heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: The sewage inlet pipe (9) includes multiple water outlets and two water inlets, the multiple water outlets are all located at the top of the homogeneous regulating tank (1), and the two water inlets are respectively located on both sides of the homogeneous regulating tank (1) for extracting leachate from two locations simultaneously; The stirring member (13) comprises a plurality of stirring shafts (132) movably mounted inside the homogenizing regulating tank (1) via sealed bearings, the bottom ends of the stirring shafts (132) sequentially passing through the partition (11) and the bottom wall of the homogenizing regulating tank (1) and extending to the bottom of the homogenizing regulating tank (1), the stirring shafts (132) and the partition (11) are movably connected via sealed bearings, the outer wall of each stirring shaft (132) is fixed with a plurality of stirring blades (133), one of which is located in the lower cavity, and the plurality of stirring shafts (132) are divided into a plurality of groups in pairs, and a turbine (131) is fixed to the top end of the stirring shaft (132) located on the outside of each group, and the turbine (131) is supported by a support. The frame is movably mounted at the outlet of the sewage inlet pipe (9), and a gear a (134) is fixed to the bottom end of the stirring shaft (132), and a gear ring a (135) is meshed on one side of the gear a (134). The gear ring a (135) is movably arranged at the bottom of the homogenization regulating tank (1) through a slide rail. A plurality of gears b (136) arranged side by side are provided inside the gear ring a (135), and two adjacent gears b (136) are meshed. The inner wall of the gear ring a (135) is meshed with one of the gears b (136), and the gear b (136) located on the inside is fixed to the bottom end of the stirring shaft (132) located on the inside of each group, and is used to drive the two stirring shafts (132) in each group to rotate in opposite directions.

3. The heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: A plate support (22) is fixed at the lower portion of the electrochemical cell (2), and a plurality of plates (21) are fixed on the top of the plate support (22). The number of the plate supports (22) is an even number, wherein the plates (21) arranged at odd positions are connected to the negative electrode of an external power supply via a wire, and the plates (21) arranged at even positions are connected to the positive electrode of the external power supply via a wire, for electrolyzing the leachate flowing into the electrochemical cell (2); Two drainage pipes b (23) are fixed to the bottom wall of the electrochemical cell (2). The drainage pipes b (23) are connected to the electrochemical cell (2) and the aeration tank (3) and are used to guide the leachate after electrolysis treatment into the interior of the aeration tank (3).

4. The heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: Both sides of the aeration tank (3) are fixedly connected with water inlet pipes (31), and a guide plate (36) inclined toward the aeration tank (3) is fixed on the upper part of each water inlet pipe (31). The leachate entering the water inlet pipe (31) through the drainage pipe b (23) will flow into the interior of the aeration tank (3) along the inclined surface of the guide plate (36); A plurality of cyclone aerators (37) are provided at the bottom of the aeration tank (3), and a stirring plate (32) for stirring the leachate is provided above the cyclone aerator (37). The stirring plate (32) is driven by a stirring plate driving member (33) to rotate inside the aeration tank (3) cavity. A level gauge (35) for monitoring the height of the liquid level inside the aeration tank (3) and two drainage pipes c (34) for connecting the aeration tank (3) and the sedimentation tank (4) are installed on the outer wall of the aeration tank (3). The leachate after aeration treatment in the aeration tank (3) flows into the sedimentation tank (4) through the drainage pipes c (34); The stirring plate driving member (33) includes a gear ring b (331) fixed to the two stirring plates (32), the bottom of the gear ring b (331) is movably connected to a support platform a (334) through a slide rail, the outer wall of the support platform a (334) is fixed to the inner wall of the aeration tank (3), the gear ring b (331) is meshed with a gear c (332), a rotating shaft a (333) is fixed in the middle of the gear c (332), the bottom end of the rotating shaft a (333) passes through the support platform a (334), and the rotating shaft a (333) and the support platform a (334) are movably connected through a bearing.

5. A heavy metal tailings pond leachate treatment device according to claim 4, characterized in that: A diversion ramp (41) is fixed to the bottom of the chamber of the sedimentation tank (4), the vertical cross-section of the diversion ramp (41) is triangular, and the hypotenuse of the triangle is inclined toward the circle. Two mud discharge pipes (49) arranged side by side are fixed inside the sedimentation tank (4), one end of each of the two mud discharge pipes (49) is connected to the interior of the sedimentation tank (4), and the other end of each of the two mud discharge pipes (49) is fixed with a conveyor b (410), and the outlet at the top of the conveyor b (410) is provided with a conveyor c (411); Two scrapers (42) are provided on the top of the diversion ramp (41) and are matched with the inclined surface of the top of the diversion ramp (41). The scrapers (42) are driven by scraper driving members (47) to rotate forward and reverse in the tank cavity of the diversion ramp (41). Cone buckets (43) are fixed on both sides of the bottom of the sedimentation tank (4). The bottom end of the cone bucket (43) is connected to a return pipe (45). The outlet of the return pipe (45) is connected to a conveyor a (46). The outlet of the conveyor a (46) is connected to the water inlet pipe (31). The biomass sludge in the sedimentation tank (4) is transported to the inside of the aeration tank (3) through the conveyor a (46); A through hole communicating with the interior of the cone hopper (43) is provided at the bottom of the diversion ramp (41) and at a position on the diversion ramp (41) corresponding to the cone hopper (43). There are two through holes, which are respectively provided on both sides of the tank cavity of the sedimentation tank (4). Two scrapers (42) are respectively located on one side of the through hole, and the rotating scrapers (42) push the biomass sludge from the through hole into the cone hopper (43); A plurality of drainage pipes d (48) are fixed to the inner wall of the sedimentation tank (4), and the drainage pipes d (48) are connected to the sedimentation tank (4) and the ecological filter tank (5), and the upper layer of liquid after sedimentation in the sedimentation tank (4) is introduced into the interior of the ecological filter tank (5) through the drainage pipes d (48); The scraper driving member (47) includes a support platform b (474) fixed to the inner wall of the sedimentation tank (4), a rotating shaft b (472) is movably connected to the top side of the support platform b (474) through a bearing, and the bottom end of the rotating shaft a (333) is movably connected to the other side of the top of the support platform b (474) through a bearing, and a gear d (471) is fixed to the top end of the rotating shaft b (472) and the bottom end of the rotating shaft a (333), and the two gears d (471) are externally meshed with the same gear ring c (4 73), the gear ring c (473) is movably mounted on the top of the support platform b (474) through a slide rail, the outer wall of the gear ring c (473) is fixed to the scraper (42), and the bottom end of the rotating shaft b (472) is provided with a driving motor for driving the gear d (471) at the outer end of the rotating shaft b (472) to rotate forward and reverse. The rotating gear d (471) drives the gear ring c (473) to drive the scraper (42) to rotate, and the angle of rotation of the gear d (471) in each direction is 180 degrees.

6. The heavy metal tailings pond leachate treatment device according to claim 1, characterized in that: A filter plate (52) is fixed below the pool cavity of the ecological filter pool (5), and an ecological filter bed (51) is provided on the top of the filter plate (52). The ecological filter bed (51) includes a soil layer, a fine sand layer, a fly ash layer, a gravel layer, a filler layer and a coarse sand layer from top to bottom, and emergent plants are planted above the soil layer; A plurality of drainage pipes e (53) for drainage are fixed at the lower portion of the ecological filtration pool (5). One end of the drainage pipe e (53) is connected to the bottom of the pool cavity of the ecological filtration pool (5), and the other end of the drainage pipe e (53) extends into the interior of the drainage barrel (6) for discharging treated water into the interior of the drainage barrel (6).

7. The heavy metal tailings pond leachate treatment device according to claim 5, characterized in that: The drainage cylinder (6) comprises a water funnel (61) fixed at the bottom end of the drainage cylinder (6), a blocking ball (62) is provided at the bottom outlet of the water funnel (61), and a hanging rope b (63) is fixed to the top of the blocking ball (62); The outer wall of the bottom end of the drainage cylinder (6) is provided with a plurality of filter holes (64), and filter meshes are embedded in the filter holes (64) to prevent underground soil from entering the interior of the drainage cylinder (6).

8. The heavy metal tailings pond leachate treatment device according to claim 7, characterized in that: The bottom outlet of the cone bucket (43) is provided with a blocking platform (44), the blocking platform (44) is used to block the outlet, and a hanging rope a (412) is fixed to the top of the blocking platform (44); The end of the lifting rope a (412) away from the blocking platform (44) and the end of the lifting rope b (63) away from the blocking ball (62) are both provided with a rope reeling mechanism, and the lifting rope a (412) and the lifting rope b (63) are respectively reeled in by the rope reeling mechanism to drive the blocking platform (44) and the blocking ball (62) to move upward.

9. The heavy metal tailings pond leachate treatment device according to claim 7, characterized in that: The top of the outer wall of the homogenizing regulating tank (1), the top of the outer wall of the electrochemical tank (2), the top of the outer wall of the aeration tank (3), the top of the outer wall of the sedimentation tank (4), and the top of the outer wall of the ecological filtration tank (5) are all fixed with steel structure platforms (7) for convenient movement of personnel, and a staircase (8) is provided between the upper and lower steel structure platforms (7) for connecting the adjacent upper and lower steel structure platforms (7); A sampling tube (65) is fixed to the inner wall of the drainage cylinder (6), and a sampling platform (66) for connecting to the steel structure platform (7) outside the homogenization regulating tank (1) is provided on one side of the top of the drainage cylinder (6).

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