A solid waste landfill leakage detection method

Abstract

The present invention discloses a method for detecting leakage in a solid waste landfill, comprising a plurality of pre-buried electrodes. The pre-buried electrode array is buried in the soil surrounding the landfill area, and the soil resistivity between adjacent pre-buried electrodes is used to identify whether there is a leak along the path. The pre-buried electrodes include hollow balls and wires. The detection device also includes a pipe system and a suction pump. The pipe system includes a main pumping pipe, a main water supply pipe, a plurality of flow pipes, and a branch valve. The hollow balls are buried in the soil surrounding the landfill area. The inner cavity of each hollow ball is connected to a flow pipe. The end of each flow pipe away from the hollow ball is connected to the main pumping pipe and the main water supply pipe in the form of a branch pipe. The branch pipes are respectively provided with a branch valve. One end of the main pumping pipe is connected to the suction pump inlet, and the main water supply pipe is connected to the water supply source. The surface of the hollow ball is provided with a plurality of flow holes. The hollow ball is conductive and connected to an external DC power supply via a wire. When the hollow ball is connected to the negative electrode via the wire, the hollow ball is connected to the main pumping pipe via the flow pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste landfill infiltration detection, in particular to a solid waste landfill leakage detection method. Background Art

[0002] Urban life generates a large amount of domestic waste, and industrial production processes also produce a lot of by-product waste. When a lot of waste cannot be directly recycled and processed, it can only be compressed and landfilled to wait for natural degradation. When the landfill is built, the leakage of these solid wastes during the degradation process will be considered.

[0003] After natural precipitation falls above the landfill area, some of the water seeps into the landfill area and then seeps out from the side walls. Generally, landfills will set up an anti-seepage layer at the boundary of the landfill area to prevent the leakage of garbage liquid in the landfill area into the surrounding soil. The anti-seepage layer is used for circulating water treatment to take away the moisture in the landfill area.

[0004] However, it's difficult for an impermeable layer to completely prevent leakage. After a while, the impermeability of some locations degrades, causing leachate from the landfill to leak into the surrounding soil. Existing technologies lack a solution that can effectively and accurately identify leaks, effectively requiring periodic sampling and analysis of the surrounding soil to determine if a leak has occurred. Summary of the Invention

[0005] The purpose of the present invention is to provide a solid waste landfill leakage detection method to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A solid waste landfill leakage detection method includes a plurality of pre-buried electrodes. The pre-buried electrode array is buried in the soil around the landfill area. The soil resistivity between adjacent pre-buried electrodes is used to identify whether there is a leak on the path.

[0008] Multiple electrodes are buried around the landfill area. When a leak occurs on the side wall of the landfill area, the soil near the leak point contains significantly more complex components than other places, and the resistivity changes significantly compared to the soil in other locations and its original state. This is used to determine the approximate location of the leak and whether leakage has occurred.

[0009] Furthermore, the embedded electrode includes a hollow ball and a conductor, and the detection device also includes a pipe system and a suction pump. The pipe system includes a main water pumping pipe, a main water supply pipe, a plurality of flow pipes and branch valves.

[0010] The hollow balls are buried in the soil around the landfill area. The inner cavity of each hollow ball is connected to a flow pipe. The end of each flow pipe away from the hollow ball is connected to the water pumping main pipe and the water supply main pipe in the form of a branch pipe. Branch valves are set on the branch pipes. One end of the water pumping main pipe is connected to the suction pump inlet, and the water supply main pipe is connected to the water supply source. Several flow holes are set on the surface of the hollow ball. The hollow ball is conductive and connected to an external DC power supply through a wire.

[0011] When the hollow ball is connected to the negative pole through a wire, the hollow ball is connected to the water main through the flow tube.

[0012] When the hollow ball is connected to the positive electrode through a wire, the hollow ball is connected to the water supply main pipe through the flow tube.

[0013] When the hollow ball is not energized, the branch valve at the end of the flow pipe connected to the hollow ball is completely closed.

[0014] The hollow ball can be used as a water source to infiltrate water into the surrounding soil, or as a water absorption point to absorb excess moisture from the surrounding soil. The specific state is determined by the end connection position of the flow pipe connected to the hollow ball, and whether it is connected to the pumping main pipe or the water supply main pipe. The branch valve controls the switching of the flow pipe to supply or absorb water. According to the technology related to soil electroosmosis, when the soil is under an external electric field, the moisture will move toward the cathode. The hollow ball connected to the negative pole of the power supply is the cathode, and the one connected to the positive pole is the anode. During the directional movement, the moisture can carry with it the soluble components on its movement path. The leachate from the landfill can be miscible with the replenished water. Except for the anions in the leachate components, the heavy metal leachate components and non-electrolyzed organic matter all move with the water to the vicinity of the hollow ball serving as the cathode. At this time, the moisture accumulated at the cathode is sucked away. The moisture can be analyzed later to obtain the components of the leachate leakage. The directionally moving water takes away the leaked liquid to prevent the leaked liquid from further spreading to the surrounding area.

[0015] Furthermore, the detection device has a detection method for further judging the leakage point of heavy metal ion leakage components, which is as follows: after judging that leakage occurs between two pre-buried electrodes,

[0016] First, record the resistance between the two embedded electrodes in the current arrangement mode, which is recorded as R1. The anode embedded electrode in this arrangement mode is used as the origin. Let the distance between the projection position of the leakage point on the line connecting the two embedded electrodes and the origin be the quantity to be determined, Lx. The distance between the two embedded electrodes is L0.

[0017] Then swap the polarity of the two pre-buried electrodes and record the resistance between the two pre-buried electrodes after the swap, which is recorded as R2.

[0018] Assume that the resistivity of heavy metal ions moving in soil moisture is k1, and the resistivity of anions leaking together with heavy metal ions moving in soil moisture is k2. The k1 / k2 ratio k is obtained by pre-calibration.

[0019] The simultaneous equations are:

[0020] Lx*k1+L0-Lx*k2=R1,

[0021] Lx*k2+L0-Lx*k1=R2,

[0022] k1 / k2=k;

[0023] There are three unknown quantities Lx, k1, k2 in the formula, find Lx;

[0024] The embedded electrode close to the leakage point is taken as the new origin, and the embedded electrodes adjacent to the leakage point in the vertical direction are tested to obtain the distance Ly between the leakage point and the origin in the vertical direction.

[0025] The leakage point is between the pre-buried electrodes distributed in the array. The total resistance can be used to determine that the leakage point is in the area surrounded by the four pre-buried electrodes. Then, the horizontal position Lx is determined with the pre-buried electrode in the lower left corner as the origin. The determination process is as above. k1 and k2 are the soil resistivity when heavy metal ions are used as carriers and anions as carriers. However, due to the changes in resistivity k1 and k2 under different leakage concentrations, it is impossible to pre-calibrate k1 and k2 for use. However, under different concentrations, the ratio of k1 to k2 is almost unchanged. The leakage concentration of other standard landfills can be used as the state to determine k1 / k2 during calibration. This method is only Improve the accuracy of leakage point determination. It is impossible to obtain accurate location data because the components of the leakage cannot be predicted in advance. Different components have an impact on the resistivity, and the original components in the soil are also different, which will affect the data of R1 and R2. However, this method can greatly narrow the scope of leakage location determination. For example, under the original method of simply relying on abnormal changes in total resistance to detect leakage, the leakage range can only be determined to the area surrounded by the four pre-buried electrodes 1. Under the determination method of using the electrode polarity to sense the resistance change, the single direction area is reduced to 0.3L0, and the total range can be reduced to the original 0.3*0.3=0.09L0 2 This is equivalent to an order of magnitude improvement in range accuracy.

[0026] Furthermore, the detection device also includes a reflux pipe and a water tank. The suction pump outlet is injected into the water tank through the reflux pipe. The water outlet of the water tank is connected to the water supply main. The water originally stored in the water tank and replenished to the embedded electrode serving as the anode is distilled water.

[0027] Distilled water is used for electroosmotic replenishment from the anode to the cathode, and does not cause a significant change in the resistance of the path. Only leakage from the landfill area, and specifically of electrolyte substances, will significantly affect the path resistance. It should be noted that the leakage of organic matter alone will not cause a significant change in the path resistance, as organic matter does not ionize and does not participate in conductivity. However, leakage of pure organic matter can be detected by the presence of organic matter in the overflowing water, which can then be identified by component identification after subsequent extraction. The water extracted during the electroosmotic process is treated in the water tank and reused as replenishment water for the anode pre-buried electrode.

[0028] Furthermore, the water tank includes a shell and a semipermeable membrane. The semipermeable membrane divides the inner chamber of the shell into a concentrate chamber and a clean water chamber. The outflow water at the end of the reflux pipe falls into the concentrate chamber, and the water supply main pipe is connected to the clean water chamber.

[0029] The water discharged by the suction pump falls into the concentrate chamber. The semipermeable membrane only allows water molecules to flow through, allowing organic matter and other water-soluble substances to be concentrated and stored in the concentrate chamber. Clean water enters the clean water chamber as storage and backup water. To analyze the leakage and components, water is taken from the concentrate chamber for analysis.

[0030] Furthermore, the detection device further comprises a filter hopper, which is placed between the concentrate chamber and the outlet of the reflux pipe.

[0031] The filter bucket filters the soil particles mixed in the sucked-up water. A filter screen can also be additionally provided on the hollow ball to only allow water to pass through and reduce the soil particles from entering the hollow ball.

[0032] Furthermore, the detection device also includes a drain pipe, a liquid level switch, and a drain valve. The drain pipe is connected to the bottom of the concentrated liquid chamber, the drain valve is provided on the drain pipe, and the liquid level switch is provided on the side wall of the concentrated liquid chamber. The liquid level switch is higher than the water level in the clean water chamber under stable conditions.

[0033] As the concentration of the intercepted organic matter in the concentrate chamber continues to increase, the water level will continue to rise. The liquid level difference formed by the high liquid level in the concentrate chamber and the low liquid level in the clean water chamber is the driving force for the concentration of the semipermeable membrane. As the concentration increases, when the liquid level rises to the liquid level switch, the drain valve is opened to drain all the water in the concentrate chamber. The opening time of the drain valve can be set according to the volume of the concentrate chamber. When it is necessary to analyze the components of the sucked-up liquid, the drain valve can also be actively opened in advance to obtain the solution to be analyzed from the concentrate chamber.

[0034] Furthermore, a graphite layer is provided on the inner wall of the hollow sphere as an electrode.

[0035] For the leakage of heavy metal components, when the metal ions move toward the cathode, they eventually receive electrons transferred from the cathode and become metal elements attached to the electrode. If too many metal cations leak from the landfill, there will be a large accumulation on the pre-buried electrode serving as the cathode near the leakage point, which will also affect the regional locking of the leakage point in subsequent cycles. Therefore, the metal attached to the cathode should be cleaned. The present application adopts the method of electrolysis again: after the pre-buried electrodes have run for a certain period of time, each pre-buried electrode and its connected flow tube operate independently, water is added to the hollow ball, and the electrode is connected to the positive pole of the DC power supply. After all the metal ions are re-ionized and enter the water body in the hollow ball, it is connected to the main water pipe to pump out the water body containing metal ions. The graphite electrode will not become ionized and dissolve in the water.

[0036] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention identifies the resistance between points through electrodes pre-buried in the soil. When the resistance changes significantly compared to the resistance of clean soil, it serves as a basis for leakage. The electrode position is also equipped with a water replenishment and suction structure, allowing the leakage components to enter the pre-buried electrode along the direction of electroosmosis and be sucked up for analysis. For leakage of heavy metal ions, the leakage point can be narrowed by changing the direction of the electrode. The water tank serves as a temporary storage location for water circulation. The semi-permeable membrane only allows clean water to flow through it, and leakage components such as organic matter are concentrated in the concentrated liquid chamber waiting to be taken out for analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 2. It is a front view schematic diagram of the buried state of the embedded electrode of the present invention around the landfill;

[0039] Figure 2 1. It is a schematic top view of the buried state of the embedded electrode of the present invention around the landfill;

[0040] Figure 3 Schematic diagram of electroosmosis during energization of the embedded electrode of the present invention;

[0041] Figure 4 This is a schematic diagram of the principle of further positioning in the case of heavy metal ion leakage according to the present invention;

[0042] Figure 5 It is a connection flow chart of the pipe system of the present invention;

[0043] Figure 6 It is a structural schematic diagram of the water tank of the present invention;

[0044] In the figure: 1-embedded electrode, 11-hollow ball, 12-flow hole, 13-wire, 2-pipe system, 21-flow pipe, 22-water pumping main pipe, 23-water supply main pipe, 24-branch valve, 3-suction pump, 4-reflux pipe, 5-water tank, 51-shell, 511-concentrated liquid chamber, 512-clear water chamber, 52-semipermeable membrane, 6-filter hopper, 71-drain pipe, 72-liquid level switch, 73-drain valve. DETAILED DESCRIPTION

[0045] 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.

[0046] A solid waste landfill leakage detection method includes a plurality of pre-buried electrodes 1, wherein the pre-buried electrode 1 array is buried in the soil around the landfill area, and the soil resistivity between adjacent pre-buried electrodes 1 is used to identify whether there is leakage on the path.

[0047] like Figure 1 、 2 As shown, multiple electrodes are buried around the landfill area. When a leak occurs on the side wall of the landfill area, the content of complex components in the soil near the leak point is significantly higher than that in other places, and the resistivity will change significantly compared with the soil in other locations and the original state. This is used to determine the approximate location of the leak and whether leakage penetration has occurred.

[0048] The embedded electrode includes a hollow ball 11 and a conductor 13. The detection device also includes a pipe system 2 and a suction pump 3. The pipe system 2 includes a water pumping main pipe 22, a water supply main pipe 23, a plurality of flow pipes 21 and a branch valve 24.

[0049] The hollow ball 11 is buried in the soil around the landfill area. The inner cavity of each hollow ball 11 is connected to a flow pipe 21. The end of each flow pipe 21 away from the hollow ball 11 is connected to the water pumping main pipe 22 and the water supply main pipe 23 in the form of a branch pipe. The branch pipes are respectively provided with a branch valve 24. One end of the water pumping main pipe 22 is connected to the inlet of the suction pump 3, and the water supply main pipe 23 is connected to the water supply source. A plurality of flow holes 12 are provided on the surface of the hollow ball 11. The hollow ball 11 is conductive and connected to an external DC power supply through a wire 13.

[0050] When the hollow ball 11 is connected to the negative electrode through the wire 13, the hollow ball 11 is connected to the water main pipe 22 through the flow pipe 21.

[0051] When the hollow ball 11 is connected to the positive electrode through the wire 13, the hollow ball 11 is connected to the water supply main pipe 23 through the flow pipe 21.

[0052] When the hollow ball 11 is not energized, the branch valve 24 at the end of the flow pipe 21 connected to the hollow ball 11 is fully closed.

[0053] like Figure 3 As shown, the hollow ball 11 can be used as a water source to infiltrate water into the surrounding soil, or as a water absorption point to absorb excess moisture from the surrounding soil. The specific state is determined by the terminal connection position of the flow pipe 21 connected to the hollow ball 11, which is connected to the water pumping main 22 or the water replenishment main 23. The branch valve 24 controls the switching of water replenishment or water absorption in the flow pipe 21. According to the technology related to soil electroosmosis, when the soil is under an external electric field, moisture will move toward the cathode. The hollow ball 11 connected to the negative pole of the power supply is the cathode, and the one connected to the positive pole is the anode. During the directional movement, moisture can carry with it soluble components on its movement path. The leachate from the landfill can be miscible with the replenished water. In addition to the anions in the leachate components, the heavy metal leachate components and non-electrolyzed organic matter all move with the water to the vicinity of the hollow ball 11 serving as the cathode. At this time, the moisture accumulated at the cathode is sucked away. The moisture can be analyzed later to obtain the components of the leachate leakage. The directional moving water takes away the leaked liquid to prevent the leaked liquid from further spreading to the surrounding area.

[0054] The detection device has a detection method for further judging the leakage point of heavy metal ion leakage components. The method is: after judging that leakage occurs between the two embedded electrodes 1,

[0055] First, record the resistance between the two embedded electrodes 1 in the current arrangement mode, which is recorded as R1. The anode embedded electrode 1 in this arrangement mode is used as the origin. Let the distance between the projection position of the leakage point on the line connecting the two embedded electrodes 1 and the origin be the quantity to be determined Lx, and the distance between the two embedded electrodes 1 be L0.

[0056] Then swap the polarity of the two pre-embedded electrodes 1 and record the resistance between the two pre-embedded electrodes 1 after the swap, which is recorded as R2.

[0057] Assume that the resistivity of heavy metal ions moving in soil moisture is k1, and the resistivity of anions leaking together with heavy metal ions moving in soil moisture is k2. The k1 / k2 ratio k is obtained by pre-calibration.

[0058] The simultaneous equations are:

[0059] Lx*k1+L0-Lx*k2=R1,

[0060] Lx*k2+L0-Lx*k1=R2,

[0061] k1 / k2=k;

[0062] There are three unknown quantities Lx, k1, k2 in the formula, find Lx;

[0063] The embedded electrode 1 close to the leakage point is taken as the new origin, and the adjacent embedded electrodes 1 in the vertical direction are tested to obtain the distance Ly between the leakage point and the origin in the vertical direction.

[0064] like Figure 4 As shown, the leakage point is between the pre-buried electrodes 1 distributed in the array. The total resistance can be used to determine that the leakage point is in the area surrounded by the four pre-buried electrodes 1. Then, the horizontal position Lx is determined with the pre-buried electrode 1 in the lower left corner as the origin. The determination process is as above. k1 and k2 are the soil resistivity when heavy metal ions are used as carriers and anions as carriers. However, due to the changes in resistivity k1 and k2 under different leakage concentrations, it is impossible to pre-calibrate k1 and k2 for use. However, under different concentrations, the ratio of k1 to k2 is almost unchanged. The leakage concentration of other standard landfills can be used as the state to determine k1 / k2 during calibration. This method This method only improves the accuracy of leak point determination, but cannot obtain accurate location data, because the components that leak cannot be predicted in advance, different components have an impact on resistivity, and the original components in the soil are also different, which will affect the data of R1 and R2. However, this method can greatly narrow the scope of leakage location determination. For example, under the original method of simply relying on abnormal changes in total resistance to detect leakage, the leakage range can only be determined to the area surrounded by the four pre-buried electrodes 1. Under the determination method of using the electrode polarity to sense the resistance change, the single direction area is reduced to 0.3L0, and the total range can be reduced to the original 0.3*0.3=0.09L0 2 This is equivalent to an order of magnitude improvement in accuracy. This allows for accurate determination of leak locations and subsequent remedial measures without requiring a high density of embedded parts when pre-embedded electrodes 1 are installed in landfills with a high probability of heavy metal leakage.

[0065] The detection device also includes a return pipe 4 and a water tank 5. The outlet of the suction pump 3 is injected into the water tank 5 through the return pipe 4. The water outlet of the water tank 5 is connected to the water supply main 23. The water originally stored in the water tank 5 and replenished to the embedded electrode 1 serving as the anode is distilled water.

[0066] like Figure 5 As shown, distilled water is used for electroosmotic water replenishment from the anode to the cathode, which does not cause a significant change in the resistance of the path. Only leakage from the landfill area, and the electrolyte, will have a significant impact on the path resistance. It should be noted that the leakage of organic matter alone will not cause a significant change in the path resistance because organic matter does not ionize and does not participate in conductivity. However, the leakage of pure organic matter can be detected by the presence of organic matter in the overflowing water and then component identification after subsequent suction. The water sucked up during the electroosmotic process is treated in the water tank 5 and then reused as replenishment water for the anode pre-buried electrode 1.

[0067] The water tank 5 includes a shell 51 and a semipermeable membrane 52. The semipermeable membrane 52 divides the inner chamber of the shell 51 into a concentrated liquid chamber 511 and a clean water chamber 512. The outflowing water at the end of the reflux pipe 4 falls into the concentrated liquid chamber 511. The water replenishment main pipe 23 is connected to the clean water chamber 512.

[0068] like Figure 6 As shown, the water discharged by the suction pump 3 falls into the concentrated liquid chamber 511, and the semipermeable membrane 52 only allows water molecules to flow through, so that organic matter and other water-soluble substances are concentrated and stored in the concentrated liquid chamber 511, and clean water enters the clean water chamber 512 as stored standby water. To analyze the leakage and components, water is taken from the concentrated liquid chamber 511 for analysis.

[0069] The detection device further includes a filter hopper 6 , which is placed between the concentrate chamber 511 and the outlet of the reflux pipe 4 .

[0070] The filter hopper 6 filters the soil particles mixed in the sucked-up water. The hollow ball 11 can also be additionally provided with a filter screen to only allow water to pass through and reduce the soil particles from entering the hollow ball 11.

[0071] The detection device also includes a drain pipe 71, a liquid level switch 72, and a drain valve 73. The drain pipe 71 is connected to the bottom of the concentrated liquid chamber 511, the drain valve 73 is set on the drain pipe 71, and the liquid level switch 72 is set on the side wall of the concentrated liquid chamber 511. The liquid level switch 72 is higher than the water level in the clean water chamber 512 in a stable state.

[0072] As the concentration of the intercepted organic matter in the concentrated liquid chamber 511 continues to increase, the water level will continue to rise. The liquid level difference formed by the high liquid level in the concentrated liquid chamber 511 and the low liquid level in the clean water chamber 512 is the driving force for the semipermeable membrane 52 to concentrate. As the concentration increases, when the liquid level rises to the liquid level switch 72, the drain valve 73 is opened to drain all the water in the concentrated liquid chamber 511. The opening time of the drain valve 73 can be set according to the volume of the concentrated liquid chamber 511. When it is necessary to analyze the components of the sucked-up liquid, the drain valve 73 can also be actively opened in advance to obtain the solution to be analyzed from the concentrated liquid chamber 511.

[0073] A graphite layer is provided on the inner wall of the hollow ball 11 as an electrode.

[0074] For the leakage of heavy metal components, when the metal ions move toward the cathode, they eventually receive electrons transferred from the cathode and become metal elements attached to the electrode. If too many metal cations leak from the landfill, there will be a large accumulation on the pre-buried electrode serving as the cathode near the leakage point, which will also affect the regional locking of the leakage point in subsequent cycles. Therefore, the metal attached to the cathode should be cleaned. The present application adopts the method of electrolysis again: after the pre-buried electrodes 1 have run for a certain period of time, each pre-buried electrode 1 and its connected flow tube 21 operate independently, and water is added to the hollow ball 11. The electrode is connected to the positive pole of the DC power supply, so that all the metal ions are re-ionized and enter the water body in the hollow ball 11. Then, it is connected to the main water pump 22 to pump out the water body containing metal ions. The graphite electrode will not become ionized and dissolve in the water.

[0075] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0076] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A solid waste landfill leakage detection method, characterized by: The detection method comprises a detection device, wherein the detection device comprises a plurality of pre-buried electrodes (1), wherein the pre-buried electrode (1) array is buried in the soil around the landfill area, and soil resistivity between adjacent pre-buried electrodes (1) is used to identify whether there is leakage on the path; The embedded electrode includes a hollow ball (11) and a conductor (13). The detection device also includes a pipe system (2) and a suction pump (3). The pipe system (2) includes a main water pumping pipe (22), a main water supply pipe (23), a plurality of flow pipes (21) and a branch valve (24). The hollow ball (11) is buried in the soil around the landfill area. The inner cavity of each hollow ball (11) is connected to a flow pipe (21). The end of each flow pipe (21) away from the hollow ball (11) is connected to a water pumping main pipe (22) and a water supply main pipe (23) in the form of a branch pipe. Branch pipe valves (24) are respectively provided on the branch pipes. One end of the water pumping main pipe (22) is connected to the inlet of the suction pump (3), and the water supply main pipe (23) is connected to the water supply source. A plurality of flow holes (12) are provided on the surface of the hollow ball (11). The hollow ball (11) is conductive and connected to an external DC power supply through a wire (13). When the hollow ball (11) is connected to the negative electrode through the wire (13), the hollow ball (11) is connected to the water main pipe (22) through the flow pipe (21). When the hollow ball (11) is connected to the positive electrode through the wire (13), the hollow ball (11) is connected to the water supply main pipe (23) through the flow pipe (21). When the hollow ball (11) is not energized, the branch valve (24) at the end of the flow pipe (21) connected to the hollow ball (11) is fully closed; The detection method further locates the leakage point of heavy metal ion leakage components, and the detection method is applied to the detection device. The method is as follows: after determining that leakage occurs between two pre-buried electrodes (1), First, record the resistance between the two embedded electrodes (1) in the current arrangement mode, which is recorded as R1. The anode embedded electrode (1) in the arrangement mode is used as the origin. Let the distance between the projection position of the leakage point on the line connecting the two embedded electrodes (1) and the origin be the quantity to be determined Lx. Let the distance between the two embedded electrodes (1) be the known quantity L0. Then, the polarity of the two pre-buried electrodes (1) is swapped, and the resistance between the two pre-buried electrodes (1) after the swap is recorded as R2. Assume that the resistivity of heavy metal ions moving in soil moisture is k1, and the resistivity of anions leaking together with heavy metal ions moving in soil moisture is k2. The k1 / k2 ratio k is obtained by pre-calibration. The simultaneous equations are: Lx*k1+(L0-Lx)*k2=R1, Lx*k2+(L0-Lx)*k1=R2, k1 / k2=k; There are three unknown quantities Lx, k1, k2 in the formula, find Lx; The embedded electrode (1) close to the leakage point is used as a new origin, and the embedded electrodes (1) adjacent to the leakage point in the vertical direction are detected to obtain the distance Ly between the leakage point and the origin in the vertical direction.

2. A solid waste landfill leakage detection method according to claim 1, characterized in that: The detection device further comprises a return pipe (4) and a water tank (5). The outlet of the suction pump (3) is injected into the water tank (5) through the return pipe (4). The water outlet of the water tank (5) is connected to a water supply main pipe (23). The water originally stored in the water tank (5) and supplied to the pre-buried electrode (1) serving as an anode is distilled water.

3. A solid waste landfill leakage detection method according to claim 2, characterized in that: The water tank (5) comprises a shell (51) and a semipermeable membrane (52). The semipermeable membrane (52) divides the inner chamber of the shell (51) into a concentrated liquid chamber (511) and a clean water chamber (512). The water flowing out of the end of the return pipe (4) falls into the concentrated liquid chamber (511). The water replenishment main pipe (23) is connected to the clean water chamber (512).

4. A solid waste landfill leakage detection method according to claim 3, characterized in that: The detection device further comprises a filter hopper (6), and the filter hopper (6) is placed between the concentrated liquid chamber (511) and the outlet of the reflux pipe (4).

5. A solid waste landfill leakage detection method according to claim 4, characterized in that: The detection device further comprises a liquid discharge pipe (71), a liquid level switch (72), and a liquid discharge valve (73). The liquid discharge pipe (71) is connected to the bottom of the concentrated liquid chamber (511), the liquid discharge valve (73) is arranged on the liquid discharge pipe (71), and the liquid level switch (72) is arranged on the side wall of the concentrated liquid chamber (511). The liquid level switch (72) is higher than the water level in the clear water chamber (512) in a stable state.

6. The solid waste landfill leakage detection method according to claim 1, characterized in that: A graphite layer is provided on the inner wall surface of the hollow ball (11) as an electrode.

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