Method for detecting leakage points and external pollution areas of a solid waste landfill site impervious system

Abstract

The application discloses a kind of leakage points and external pollution area detection methods of running solid waste landfill anti-seepage system, comprising the following steps: S1 inside the solid waste landfill is arranged inside electrode well;S2 is arranged outside electrode well in the solid waste landfill;S3 is collected by unmanned aerial vehicle carrying magnetic field measuring device magnetic field data above the solid waste landfill;S4 is arranged electrode in the inside electrode well and the outside electrode well;S5 each the outside electrode well is sequentially connected with each inside electrode well, and current transmitter is turned on, so that the inside electrode well and the outside electrode well constitute first closed loop, and the magnetic field data above the first closed loop is collected by unmanned aerial vehicle carrying magnetic field measuring device, and compared with the magnetic field data collected in step S3, to obtain the leakage path from the inside of solid waste landfill to outside;The application detects using electromagnetic method, can realize trenchless detection, efficient and fast.

Description

Technical Field

[0001] The present application relates to the field of environmental engineering technology, and in particular to a method for detecting leakage points and external contaminated areas in an anti-seepage system of an operating solid waste landfill. Background Art

[0002] Relevant data show that there are more than 650 domestic waste landfills, more than 100 hazardous waste landfills, and a large number of general industrial solid waste landfills in cities across the country. These landfills are equipped with anti-seepage systems in accordance with current national standards and specifications. However, during the landfill operation process, damage is inevitable, and pollutants seep out and pollute the environment. After construction is completed, most landfills have leakage problems, and the leakage points can be several kilometers or more away from the landfill.

[0003] Currently, the problem of landfill leakage is addressed by first delineating the leaking area, then excavating the area. Once the waste is removed from the landfill, the leak point is precisely located. This process is highly risky. During excavation, the waste from the landfill generates toxic, hazardous, flammable, and explosive gases, which can easily cause accidents such as poisoning, explosions, and landslides. This is also costly and carries a high risk of secondary pollution. Furthermore, the delineation of the leaking area can have significant errors, making it difficult to accurately detect the leak point, leading to persistent leakage. Some landfills have been leaking for years, causing severe environmental pollution.

[0004] Therefore, how to accurately and easily detect leakage points and contaminated areas in the anti-seepage system of solid waste landfills is an urgent problem to be solved. Summary of the Invention

[0005] The present application provides a method for detecting leakage points and external contaminated areas in an operational solid waste landfill anti-seepage system. This method uses electromagnetic detection to achieve trenchless detection without the risk of secondary pollution or landslides. The method is efficient and quick. The technical solution is as follows:

[0006] The present application provides a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system, comprising the following steps: S1 arranging an internal electrode well inside the solid waste landfill; S2 arranging an external electrode well outside the solid waste landfill; S3 collecting magnetic field data above the solid waste landfill by using a magnetic field measuring device carried by an unmanned aerial vehicle; S4 arranging electrodes in the internal electrode well and the external electrode well; S5 insulating the boundary of the solid waste landfill; S6 connecting each of the external electrode wells with each of the internal electrode wells in turn, turning on a current transmitter, so that the internal electrode well and the external electrode well form a first closed loop, and using a magnetic field measuring device carried by an unmanned aerial vehicle to measure the magnetic field. The field measuring device collects the magnetic field data above the first closed loop and compares it with the magnetic field data collected in the step S3 to obtain the leakage path from the inside to the outside of the solid waste landfill; S7 connects each of the external electrode wells in sequence and turns on the current transmitter so that the external electrode wells form a second closed loop, collects the magnetic field data above the second closed loop by using the magnetic field measuring device carried by the drone, and compares it with the magnetic field data collected in the step S3 to obtain the leakage path outside the solid waste landfill; S8 verifies the leakage path; wherein, there is solid waste landfill leachate in both the internal electrode well and the external electrode well.

[0007] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, the verification of the leakage path in step S8 includes: first, determining the leakage points of the anti-seepage system in the solid waste landfill and the contaminated area outside the solid waste landfill based on the leakage paths obtained in steps S6 and S7, and arranging verification survey holes at the boundaries of the contaminated areas outside the solid waste landfill; then, placing different types of tracers at the leakage points of the anti-seepage system in the solid waste landfill; then, taking water samples from the verification survey holes for testing, and analyzing the types of tracers to verify the leakage points of the anti-seepage system in the solid waste landfill and the contaminated area outside the solid waste landfill, and determining the leakage rates of different leakage points.

[0008] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, the method for arranging internal electrode wells inside the solid waste landfill in step S1 is: arranging exploration holes at intervals inside the solid waste landfill, and using the exploration holes with accumulated water as internal electrode wells.

[0009] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, the method for arranging external electrode wells outside the solid waste landfill in step S2 is as follows: the first step is to find and mark the seepage points of pollutants outside the solid waste landfill and set up a water collection well at the seepage point, and use the water collection well as the first external electrode well; the second step is to take water samples from the water collection well and the monitoring well outside the solid waste landfill for testing, and compare the test results with the pollution index of the leachate of the solid waste landfill to determine the characteristic index and concentration of the pollutants in the solid waste landfill; the third step is to arrange a survey line outside the solid waste landfill and drill survey holes at intervals, take water samples from the survey holes for testing, and compare them with the characteristic index and concentration of the pollutants in the solid waste landfill. The first step is to drill a second intermediate exploration hole between the first intermediate exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the first intermediate exploration hole for testing and compare them with the pollutant characteristic indicators and concentrations of the solid waste landfill, and determine the first intermediate exploration hole with pollutants; the fifth step is to continue drilling a second intermediate exploration hole between the first intermediate exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the second intermediate exploration hole for testing and compare them with the pollutant characteristic indicators and concentrations of the solid waste landfill, and determine the second intermediate exploration hole with pollutants; the sixth step is to repeat the fourth and fifth steps 2-3 times to preliminarily determine the pollution boundary point; the seventh step is to use the exploration hole with pollutants as the second external electrode well.

[0010] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, each of the first external electrode wells is connected in sequence to each monitoring well outside the solid waste landfill and each of the second external electrode wells, and a current transmitter is turned on, so that the first external electrode well, the second external electrode well and the monitoring well outside the solid waste landfill form a second closed loop.

[0011] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in the first step, the depth of the water collection well is greater than 1m, and the diameter of the water collection well is not less than 0.1m.

[0012] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in the third step, according to the groundwater levels and water flow directions inside and outside the solid waste landfill, survey lines are arranged in the downstream direction of the groundwater and survey holes are drilled at intervals, and the depth of the survey holes is 1 m below the water level line.

[0013] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in step S8, the verification survey hole is arranged 3-5 meters inside and outside the boundary of the contaminated area, and the depth of the verification survey hole is below 1 meter from the water level line.

[0014] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in step S8, a tracer release exploration hole is drilled at the leakage point of the anti-seepage system in the solid waste landfill and drilled to the top surface of the solid waste landfill anti-seepage system, and a limiting tube is set 10 cm above the bottom of the tracer release exploration hole to allow the tracer to leak from the bottom of the tracer release exploration hole.

[0015] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, a drone equipped with a laser radar is used to measure a three-dimensional topographic map covering the solid waste landfill and external pollutant seepage points, and the position coordinates and depths of the internal electrode wells and the external electrode wells are imported into the three-dimensional topographic map, and the drone's near-ground flight mode is determined based on the three-dimensional topographic map.

[0016] The beneficial effects of a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided by some embodiments of the present application are as follows: the present application adopts electromagnetic detection, which can realize trenchless detection without the risks of secondary pollution, collapse and landslide, etc. The drone is equipped with a magnetic field measuring device to collect magnetic field data of each working condition according to the set near-ground flight mode. The electromagnetic method is combined with traditional survey and detection, that is, the arrangement of electrode wells inside and outside the solid waste landfill. Through the arrangement of electrode wells outside the solid waste landfill, the arrangement of electrode wells inside the solid waste landfill, the setting of water collection wells at the seepage points of pollutants outside the solid waste landfill and the connection method of each electrode well, the comprehensiveness of the detection is guaranteed, the accuracy of the detection can be improved, the layout and method are optimized, and the detection can be systematic. The drone is equipped with an electromagnetic detection device to realize efficient and automatic collection of magnetic field data, and batch processing and analysis by computer are used to realize data collection of all working conditions, and it is efficient and fast. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0018] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0019] The present application provides a method for detecting leakage points and external contaminated areas in an operational solid waste landfill anti-seepage system, comprising the following steps:

[0020] S1 arranges internal electrode wells inside the solid waste landfill;

[0021] S2 arranges external electrode wells outside the solid waste landfill;

[0022] S3 collects magnetic field data above the solid waste landfill using a drone equipped with a magnetic field measurement device;

[0023] S4: arranging electrodes in the inner electrode well and the outer electrode well, submerging them below the water level and as close to the bottom of the electrode well as possible;

[0024] S5 Insulation treatment of the solid waste landfill boundary, specifically, removing the soil layer around the solid waste landfill until the HDPE membrane of the anti-seepage system is exposed. This process must not damage the HDPE membrane;

[0025] S6: connecting each of the external electrode wells to each of the internal electrode wells in sequence, and turning on a current transmitter so that the internal electrode wells and the external electrode wells form a first closed loop; collecting magnetic field data above the first closed loop using a magnetic field measuring device carried by an unmanned aerial vehicle, and comparing the data with the magnetic field data collected in step S3 to obtain a leakage path from the interior to the exterior of the solid waste landfill;

[0026] S7: connecting the external electrode wells in sequence and turning on the current transmitter so that the external electrode wells form a second closed loop; collecting magnetic field data above the second closed loop using a magnetic field measuring device carried by an unmanned aerial vehicle; and comparing the magnetic field data collected in step S3 to obtain the leakage path outside the solid waste landfill;

[0027] S8 Leakage path verification;

[0028] Among them, there is solid waste landfill leachate in both the internal electrode well and the external electrode well. When the current transmitter is turned on, a closed loop is formed by the leachate, and the current in the closed loop generates a magnetic field. The magnetic field data is then collected by a magnetic field measuring device carried by an unmanned aerial vehicle to infer the current loop, thereby determining the leakage path.

[0029] The magnetic field data above the solid waste landfill is collected in S3 as a blank control to eliminate the magnetic field interference caused by rocks and other objects in and outside the solid waste landfill.

[0030] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, the verification of the leakage path in step S8 includes: first, determining the leakage points of the anti-seepage system in the solid waste landfill and the contaminated area outside the solid waste landfill based on the leakage paths obtained in steps S6 and S7, and arranging verification survey holes at the boundaries of the contaminated areas outside the solid waste landfill; then, placing different types of tracers at the leakage points of the anti-seepage system in the solid waste landfill; then, taking water samples from the verification survey holes for testing, and analyzing the types of tracers to verify the leakage points of the anti-seepage system in the solid waste landfill and the contaminated area outside the solid waste landfill, and determining the leakage rates of different leakage points.

[0031] According to the above embodiment, when a tracer can be detected in the verification and exploration hole in the contaminated area outside the solid waste landfill, the leakage path can be further determined; by placing different types of tracers at different leakage points and detecting the type of tracer in the verification and exploration hole, it can be determined from which leakage point the leachate in the verification and exploration hole leaked.

[0032] For example, in one embodiment, a method for detecting leaks and external contaminated areas in an operational solid waste landfill's anti-seepage system is provided. The method for arranging internal electrode wells within the solid waste landfill in step S1 is as follows: exploration holes are arranged at intervals within the solid waste landfill, with exploration holes with accumulated water serving as internal electrode wells. For example, the exploration holes are initially arranged at 100m x 100m intervals. For large solid waste landfills, the spacing can be increased; for smaller landfills, the spacing can be decreased. The drilling depth is set as close as possible to the bottom anti-seepage layer without damaging the bottom anti-seepage system. Subsequently, additional exploration holes are added to the center of the grid as needed.

[0033] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, the method for arranging external electrode wells outside the solid waste landfill in step S2 is:

[0034] The first step is to find and mark the pollutant seepage points outside the solid waste landfill and set up water collection wells at the seepage points, using the water collection wells as the first external electrode wells;

[0035] The second step is to collect water samples from the water collection wells and monitoring wells outside the solid waste landfill for testing. The test results are compared with the pollution indicators of the solid waste landfill leachate to determine the characteristic indicators and concentrations of pollutants in the solid waste landfill;

[0036] The third step is to arrange a survey line around the solid waste landfill and drill survey holes at intervals. Water samples are taken from the survey holes for testing and compared with the characteristic indicators and concentrations of pollutants in the solid waste landfill to identify the survey holes with pollutants.

[0037] The fourth step is to drill a first intermediate exploration hole between the exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the first intermediate exploration hole for testing and compare them with the characteristic indicators and concentrations of pollutants in the solid waste landfill to determine the first intermediate exploration hole with pollutants;

[0038] Step 5: Continue drilling a second intermediate exploration hole between the first intermediate exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the second intermediate exploration hole for testing and compare them with the characteristic indicators and concentrations of pollutants in the solid waste landfill to determine the second intermediate exploration hole with pollutants;

[0039] Step 6: Repeat steps 4 and 5 2-3 times to preliminarily determine the pollution boundary point;

[0040] In the seventh step, the exploration hole with contaminants is used as the second external electrode well.

[0041] According to the above embodiment, the arrangement method of the external electrode wells outside the solid waste landfill can shorten the distance between the external electrode wells as much as possible, thereby avoiding the situation where the distance between the external electrode wells is too far, resulting in insufficient current intensity in the closed loop formed, and the magnetic field formed is too weak, making it difficult for the magnetic field measuring device to detect the magnetic field, thereby affecting the determination of the seepage path.

[0042] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, each of the first external electrode wells is connected in sequence to each monitoring well outside the solid waste landfill and each of the second external electrode wells, and a current transmitter is turned on, so that the first external electrode well, the second external electrode well and the monitoring well outside the solid waste landfill form a second closed loop. For example, the first external electrode wells are recorded as a, b, c...n, the monitoring wells are recorded as A1, A2, A3...An, and the second external electrode wells are recorded as B1, B2, B3...Bn. Then, the first external electrode well a is connected to the second external electrode wells B1, B2, B3...Bn and the monitoring wells A1, A2, A3...An in sequence, and then the first external electrode well b is connected to the second external electrode wells B1, B2, B3...Bn and the monitoring wells A1, A2, A3...An in sequence, until the first external electrode well n is connected to the second external electrode wells B1, B2, B3...Bn and the monitoring wells A1, A2, A3...An in sequence.

[0043] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in the first step, the external pollutant seepage points of the solid waste landfill are found and marked. The marker is an object that is convenient for subsequent drones equipped with laser radar to identify and locate it. The depth of the water collection well is greater than 1m, and the diameter of the water collection well is not less than 0.1m.

[0044] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in the third step, according to the groundwater levels and water flow directions inside and outside the solid waste landfill, survey lines are arranged in the downstream direction of the groundwater and survey holes are drilled at intervals, and the depth of the survey holes is 1 m below the water level line.

[0045] Specifically, exploration holes are drilled at intervals of 60-100m, and the specific spacing is adjusted according to the actual site conditions.

[0046] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in step S8, the verification survey hole is arranged 3-5 meters inside and outside the boundary of the contaminated area, and the depth of the verification survey hole is below 1 meter from the water level line.

[0047] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, in step S8, a tracer release exploration hole is drilled at the leakage point of the anti-seepage system in the solid waste landfill and drilled to the top surface of the solid waste landfill anti-seepage system, and a limiting tube is set 10 cm above the bottom of the tracer release exploration hole to allow the tracer to leak from the bottom of the tracer release exploration hole.

[0048] The limiting tube is a PVC tube. By setting the PVC limiting tube above the bottom of the tracer release exploration hole, the flow area of ​​the tracer can be limited, so that the tracer basically leaks from the bottom of the tracer release exploration hole, preventing the tracer flow from being too dispersed.

[0049] The seepage rate at each landfill's anti-seepage system is also determined, providing a basis for subsequent remediation plans. For sites with particularly slow seepage, longer monitoring periods may be required, allowing for preemptive measures in off-site contaminated areas to minimize environmental contamination. Verifying and measuring seepage rates with tracers lays a solid foundation for further remediation efforts.

[0050] For example, in a method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system provided in one embodiment, a laser radar is used on an unmanned aerial vehicle to measure a three-dimensional topographic map covering the solid waste landfill and external pollutant seepage points. Based on the existing hydrogeological data of the solid waste landfill or a hydrogeological survey, the groundwater level and water flow direction covering the solid waste landfill and external pollutant seepage points are determined, a water level and flow direction map is drawn, and important parameters such as the area, perimeter, location of external pollutant seepage points, and location of existing monitoring wells of the solid waste landfill are determined and imported into the three-dimensional topographic map. The position coordinates and depths of the internal electrode wells and the external electrode wells are then imported into the three-dimensional topographic map, and the near-ground flight mode of the unmanned aerial vehicle is determined based on the three-dimensional topographic map.

[0051] According to the above embodiment, the three-dimensional topographic map covering the solid waste landfill and the external pollutant seepage points is measured by using a drone equipped with a lidar, which can ensure the smooth and efficient implementation of the entire detection work. The drone's near-ground flight mode is determined based on the three-dimensional topographic map. The drone is equipped with a magnetic field measurement device to collect magnetic field data for each working condition according to the set near-ground flight mode, which ensures the consistency of the magnetic field data detection method, is not affected by the terrain, and can realize rapid magnetic field data detection for multiple working conditions; it greatly saves manpower and material resources and improves efficiency.

[0052] The data collected by the magnetic field measuring device mounted on the drone is batch-processed through a computer system to obtain the magnetic field cloud map of each working condition. The magnetic field cloud map is analyzed for a single working condition or a combination of multiple working conditions. The magnetic field cloud maps above the solid waste landfill and the external pollutant seepage point before the current transmitter is turned on are compared to comprehensively determine the leakage points of the solid waste landfill anti-seepage system and the off-site contaminated areas.

[0053] The present application discloses a method for detecting leakage points and external contaminated areas of an anti-seepage system of an operating solid waste landfill, which adopts electromagnetic detection and can realize trenchless detection without the risks of secondary pollution, collapse and landslide. The drone is equipped with a magnetic field measuring device to collect magnetic field data of each working condition according to the set near-ground flight mode. The electromagnetic method is combined with traditional survey and detection, that is, the arrangement of electrode wells inside and outside the solid waste landfill. The arrangement of electrode wells outside the solid waste landfill, the arrangement of electrode wells inside the solid waste landfill, the setting of water collection wells at the seepage points of pollutants outside the solid waste landfill and the connection method of each electrode well ensures the comprehensiveness of detection, improves the accuracy of detection, optimizes the layout and method, and can be systematically detected. The drone is equipped with an electromagnetic detection device to realize efficient and automatic collection of magnetic field data, and batch processing and analysis by a computer are used to realize data collection of all working conditions, and it is efficient and fast.

[0054] Although the implementation scheme of the present application has been disclosed as above, it is not limited to the applications listed in the description and implementation mode. It can be fully applied to various fields suitable for the present application. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present application is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for detecting leakage points and external contaminated areas in an operational solid waste landfill anti-seepage system, characterized in that: The following steps are involved: S1 arranges internal electrode wells inside the solid waste landfill; S2 arranges external electrode wells outside the solid waste landfill; S3 collects magnetic field data above the solid waste landfill using a drone equipped with a magnetic field measurement device; S4 arranges electrodes in the inner electrode well and the outer electrode well; S5 solid waste landfill boundary insulation treatment; S6: connecting each of the external electrode wells to each of the internal electrode wells in sequence, and turning on a current transmitter so that the internal electrode wells and the external electrode wells form a first closed loop; collecting magnetic field data above the first closed loop using a magnetic field measuring device carried by an unmanned aerial vehicle, and comparing the data with the magnetic field data collected in step S3 to obtain a leakage path from the interior to the exterior of the solid waste landfill; S7: connecting the external electrode wells in sequence and turning on the current transmitter so that the external electrode wells form a second closed loop; collecting magnetic field data above the second closed loop using a magnetic field measuring device carried by an unmanned aerial vehicle; and comparing the magnetic field data collected in step S3 to obtain the leakage path outside the solid waste landfill; S8 Leakage path verification; Wherein, there is solid waste landfill leachate in both the inner electrode well and the outer electrode well.

2. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 1 is characterized in that: The verification of the leakage path in step S8 includes: First, according to the leakage paths obtained in step S6 and step S7, the leakage points of the anti-seepage system in the solid waste landfill and the contaminated area outside the solid waste landfill are determined, and verification survey holes are arranged at the boundaries of the contaminated area outside the solid waste landfill; Then different types of tracers are placed at the leakage points of the anti-seepage system in the solid waste landfill; Then take water samples from the verification and exploration holes for testing, and analyze the types of tracers to verify the leakage points of the anti-seepage system in the solid waste landfill and the contaminated areas outside the solid waste landfill, and determine the leakage rates of different leakage points.

3. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 1, characterized in that: The method for arranging internal electrode wells inside the solid waste landfill in step S1 is: arranging exploration holes at intervals inside the solid waste landfill, and using the exploration holes with accumulated water as internal electrode wells.

4. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 1, characterized in that: The method for arranging the external electrode well outside the solid waste landfill in step S2 is: The first step is to find and mark the pollutant seepage points outside the solid waste landfill and set up water collection wells at the seepage points, using the water collection wells as the first external electrode wells; The second step is to collect water samples from the water collection wells and monitoring wells outside the solid waste landfill for testing. The test results are compared with the pollution indicators of the solid waste landfill leachate to determine the characteristic indicators and concentrations of pollutants in the solid waste landfill; The third step is to arrange a survey line around the solid waste landfill and drill survey holes at intervals. Water samples are taken from the survey holes for testing and compared with the characteristic indicators and concentrations of pollutants in the solid waste landfill to identify the survey holes with pollutants. The fourth step is to drill a first intermediate exploration hole between the exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the first intermediate exploration hole for testing and compare them with the characteristic indicators and concentrations of pollutants in the solid waste landfill to determine the first intermediate exploration hole with pollutants; Step 5: Continue drilling a second intermediate exploration hole between the first intermediate exploration hole with pollutants and the adjacent exploration hole without pollutants, take water samples from the second intermediate exploration hole for testing and compare them with the characteristic indicators and concentrations of pollutants in the solid waste landfill to determine the second intermediate exploration hole with pollutants; Step 6: Repeat steps 4 and 5 2-3 times to preliminarily determine the pollution boundary point; In the seventh step, the exploration hole with contaminants is used as the second external electrode well.

5. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 4 is characterized in that: Each of the first external electrode wells is connected in sequence to each monitoring well outside the solid waste landfill and each of the second external electrode wells, and the current transmitter is turned on, so that the first external electrode well, the second external electrode well and the monitoring well outside the solid waste landfill form a second closed loop.

6. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 4, characterized in that: In the first step, the depth of the water collection well is greater than 1m, and the diameter of the water collection well is not less than 0.1m.

7. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 4, characterized in that: In the third step, according to the groundwater levels and water flow direction inside and outside the solid waste landfill, survey lines are arranged in the downstream direction of the groundwater and survey holes are drilled at intervals, and the depth of the survey holes is 1m below the water level.

8. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 2, characterized in that: In step S8, the verification and exploration holes are arranged 3-5 meters away from the boundary of the contaminated area, and the depth of the verification and exploration holes is 1 meter below the water level.

9. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 2, characterized in that: In step S8, a tracer release exploration hole is drilled at the leakage point of the anti-seepage system in the solid waste landfill and drilled to the top surface of the anti-seepage system of the solid waste landfill. A limiting tube is set 10 cm above the bottom of the tracer release exploration hole to allow the tracer to leak from the bottom of the tracer release exploration hole.

10. The method for detecting leakage points and external contaminated areas of an operational solid waste landfill anti-seepage system according to claim 1, characterized in that: Using a drone equipped with a lidar, a three-dimensional topographic map covering the solid waste landfill and external pollutant seepage points is measured, and the position coordinates and depths of the internal electrode wells and external electrode wells are imported into the three-dimensional topographic map. The drone's near-ground flight mode is determined based on the three-dimensional topographic map.