Land reclamation and remediation device and method applied to land resource management

Abstract

The invention discloses a land reclamation and remediation device and method applied to land resource management, and relates to the technical field of soil remediation, the land reclamation and remediation device comprises an electrode plate, a flow channel is formed in a polluted area in the longitudinal direction, and the electrode plate is arranged in the flow channel; a mounting groove is formed in the polluted area in the transverse direction, and the heating plate is arranged in the mounting groove. In-situ remediation of the polluted area is adopted, runners and mounting grooves are formed in the polluted area in the longitudinal and transverse directions, electrode plates and heating plates are mounted in the runners and the mounting grooves correspondingly, the electrode plates are used for forming a direct-current electric field, electrodialysis and electromigration are formed in the polluted area, and charged ions or ligands migrate to the electrode plates with opposite electrical properties under the action of an external electric field; pore water in the soil flows from the anode plate to the cathode plate. And the heating plate is used for heating soil in a polluted area, so that internal pollutants volatilize and the migration speed is increased. In the EK environment, the heating plate accelerates the migration speed, so that the restoration speed of the polluted area is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a land reclamation and remediation device and method for land resource management. Background Art

[0002] At present, the remediation of pollution sources in soil can be divided into in-situ remediation and ex-situ remediation. Among them, the remediation cycle of ex-situ remediation is relatively short and the remediation efficiency is generally high. However, it is not applicable to places where the contaminated soil is located in a large area.

[0003] In-situ remediation generally uses chemical remediation technology, which first breaks up the soil, then sprays the chemical remediation liquid on the contaminated soil, allowing the remediation liquid to combine with the pollutants and convert the pollutants into low-toxic substances. Due to the different depths of contamination in different soils, it is difficult for deep soil to contact the remediation liquid, so the remediation effect is not good. In addition, chemical remediation technology also has the problem of residual remediation liquid, which may cause secondary pollution to the soil.

[0004] Electrokinetic remediation (EK) is an emerging soil remediation technology that applies a DC electric field to promote the migration of pollutants in the soil, thereby achieving the purpose of remediation. However, EK technology is less efficient in treating soil pollution. 3 Under the condition of 96 hours of continuous operation, the heavy metal content in the soil can be reduced by about 40% (reaching the standard of exhibition type II land (residual amount in the soil <600mg / kg)), so it has not been widely used yet.

[0005] Compared with chemical remediation technology, electrodynamic remediation technology is more environmentally friendly and reliable. In view of this, how to provide a device that can accelerate the efficiency of electrodynamic remediation of soil is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a land reclamation and restoration device and method for land resource management to solve the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the present invention provides a land reclamation and restoration device for land resource management, comprising:

[0008] An electrode plate, a flow channel is opened in the contaminated area in the longitudinal direction, and the electrode plate is arranged in the flow channel;

[0009] The heating plate has an installation groove opened in the contaminated area along the horizontal direction, and the heating plate is arranged in the installation groove.

[0010] Furthermore, it also includes a connecting assembly for connecting adjacent electrode plates and / or adjacent heating plates in a vertical direction.

[0011] Furthermore, the connection component includes:

[0012] A clamping piece is integrally arranged on the electrode plate and / or the heating plate along the length direction, and a clamping slot is arranged at the bottom of the electrode plate and / or the heating plate, and the clamping piece can be engaged with the clamping slot;

[0013] An integrated board, wherein a first electrical connector is disposed on a side of the electrode plate and / or the heating plate, and a plurality of electrical connection holes are disposed on a side of the integrated board, and when the first electrical connector is inserted into the electrical connection hole, the clamping member is connected to the integrated board;

[0014] The second electrical connector is arranged on the integrated board and is used for connecting to a power supply.

[0015] Furthermore, it also includes:

[0016] A first electromagnet is arranged on the side of the electrode plate and / or the heating plate and is spaced apart from the first electrical connector;

[0017] The second electromagnet is arranged on the side of the integrated board, the first electromagnet is connected to the first electrical connector, and the second electromagnet is connected to the second electrical connector. When the first electrical connector is inserted into the electrical connection hole, the first electromagnet and the second electromagnet are attracted to each other.

[0018] Furthermore, it also includes:

[0019] A trenching machine is provided with a trenching assembly capable of adjusting the trenching depth. The trenching machine is used for opening flow channels and installing grooves in polluted areas.

[0020] Furthermore, it also includes: a soil sampling mechanism, the soil sampling mechanism includes:

[0021] A cylindrical collection tube, wherein the cylindrical collection tube is a cylindrical structure with a lower opening, and the lower edge of the cylindrical collection tube has a sawtooth structure, and the cylindrical collection tube is provided with sampling holes through the inner and outer surfaces;

[0022] A rotating motor, the output end of which is fixedly connected to the top of the cylindrical collecting tube;

[0023] A cylinder is fixedly arranged on the outer side of the trencher, and an output end of the cylinder is fixedly connected to the rotating motor.

[0024] Furthermore, it also includes:

[0025] A storage chamber is integrally arranged on the trenching machine and is used to store electrode plates, heating plates, power supplies and a soil analyzer. The soil analyzer is used to confirm the contamination depth of the contaminated area based on the sample.

[0026] Furthermore, a pollution unit is defined between the flow channel and the mounting groove, and the pollution unit is provided with air holes, which are connected to the water vapor pipeline and input water vapor into the pollution unit.

[0027] The present invention also provides a land consolidation and restoration method for land resource management, comprising the following steps:

[0028] S1: Collect samples in the contaminated area through a soil sampling mechanism, divide the samples into multiple contaminated intervals along the depth direction of the contaminated area, and send the samples of multiple contaminated intervals to the soil analyzer in sequence to confirm the contamination depth of the contaminated area;

[0029] S2: A flow channel and an installation groove are opened in the contaminated area along the longitudinal and transverse directions by a trenching machine; the depth of the flow channel and the installation groove corresponds to the depth of the contamination;

[0030] S3: Confirm the height of the electrode plate and the heating plate according to the depth of the flow channel and the installation groove;

[0031] S4: The electrode plate includes a cathode plate and an anode plate, and the cathode plate and the anode plate are arranged in different flow channels; the cathode plate is located between two adjacent anode plates and the anode plate is arranged in the two outermost flow channels; and a heating plate is arranged in the mounting groove;

[0032] S3: A pollution unit is defined between the flow channel and the mounting groove, and an air hole is opened in the middle of the pollution unit, and the depth of the air hole is 60%-70% of the pollution depth;

[0033] S4: The electrode plate and the heating plate are powered on, and 100 degrees Celsius steam is input into the pollution unit through the pores. A DC electric field is formed between the anode plate and the cathode plate, and the charged pollutants in the pollution unit are enriched on the anode plate or the cathode plate; the pore water in the pollution unit flows toward the cathode plate under the action of the DC electric field, and the uncharged pollutants in the pollution unit flow with the pore water to the flow channel where the cathode plate is located;

[0034] S5: After the soil remediation of the polluted area is completed, the electrode plates and pore water in the flow channel are taken out, and the charged pollutants enriched on the anode plates and cathode plates and the uncharged pollutants in the pore water are centrally treated;

[0035] S6: Take out the heating plate, use clean soil to backfill the flow channel, installation groove and air hole, and centrally process the excavated soil generated by opening the flow channel, installation groove and air hole.

[0036] Furthermore, the distance between adjacent cathode plates and anode plates is 60cm-100cm, the voltage between the cathode plates and anode plates is 30-60V, and the current density is 5-8A / m 3 , the heating temperature of the heating plate is 120-150 degrees Celsius.

[0037] The present invention discloses the following technical effects:

[0038] 1. The present invention adopts in-situ remediation of the contaminated area. Flow channels and installation grooves are opened in the vertical and horizontal directions of the contaminated area, and electrode plates and heating plates are installed respectively. The electrode plates are used to form a DC electric field, and electrodialysis and electromigration are formed in the contaminated area. Charged ions or ligands migrate to the electrode plates with opposite electrical properties under the action of the external electric field. The pore water in the soil flows from the anode plate to the cathode plate, and the pollutants that migrate with the pore water are enriched near the cathode plate. The heating plate is used to heat the soil in the contaminated area, so that the internal pollutants volatilize and accelerate the migration speed. In the EK environment, the heating plate accelerates the migration speed, which greatly improves the repair speed of the contaminated area.

[0039] 2. This combined technology not only has a good remediation effect on heavy metal-contaminated soil, but can also remove inorganic salts and organic pollution in the soil. This means that the combined technology of EK and heating plates can cope with a wider range of pollutant types and more complex pollution situations.

[0040] 3. No chemical repair agent is added during the entire process of EK and heating plate repair, which helps to avoid the risk of secondary contamination and reduce the chemical cost during the repair process. Compared with other existing methods, the combination of EK and heating plate technology has low energy consumption and cost.

[0041] 4. Based on EK and heating plate, this application introduces 100 degrees Celsius water vapor into the contaminated area. On the one hand, water vapor is beneficial to maintaining the temperature of the contaminated area and diffuses outward from the middle of the contaminated area to form pores, further accelerating the volatilization and migration of pollutants; on the other hand, part of the water vapor condenses and settles in the soil in the contaminated area during the diffusion process, which is beneficial to maintaining soil moisture and accelerating the electrodialysis rate, thereby increasing the repair speed of the contaminated area. This combined repair solution can reduce the repair time of the contaminated area to less than 24 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0043] Figure 1 This is a schematic diagram of the contaminated area;

[0044] Figure 2 It is a schematic diagram of the heating plate integration;

[0045] Figure 3 is a schematic diagram of a heating plate;

[0046] Figure 4 It is the schematic diagram of the integrated board;

[0047] Figure 5 It is a schematic diagram of the integration of two adjacent heating plates;

[0048] Figure 6 It is a schematic diagram of a trenching machine;

[0049] Figure 7 It is a schematic diagram of the sampling mechanism;

[0050] Among them, 1. contaminated area; 2. flow channel; 3. mounting groove; 4. cathode plate; 5. anode plate; 6. heating plate; 7. clamping part; 8. clamping groove; 9. integrated board; 10. first electrical connector; 11. second electrical connector; 12. electrical connection hole; 13. first electromagnet; 14. second electromagnet; 15. trencher; 16. cylindrical collection tube; 17. rotating motor; 18. cylinder; 19. storage chamber; 20. air hole. DETAILED DESCRIPTION

[0051] Electrokinetic remediation (EK) is a technology that uses an electric field to act on the soil to cause pollutants in the soil to migrate to the vicinity of the electrode. This technology inserts a cathode and an anode into the soil and applies a DC electric field, causing charged pollutants (such as heavy metal ions and charged organic molecules) to migrate under the action of the electric field. Through the action of the electric field, pollutants in the soil can be migrated to the vicinity of the electrode, thereby achieving centralized treatment of pollutants.

[0052] Studies have shown that when EK technology is used alone, the removal efficiency of certain pollutants (such as pentachlorophenol PCP) is low. For example, it is difficult to remove PCP from soil using EK technology alone. Studies have shown that the combination of electrokinetic remediation technology and permeable reaction wall (PRB) can effectively remediate soil contaminated by heavy metals such as chromium (Cr) and arsenic (As). For example, in the study of Zhang et al., by using calcined hydrotalcite as a filler material, EK-PRB remediation of soil contaminated by Cr(VI) was performed. The results showed that this combined remediation system has a good remediation effect on both lightly and heavily contaminated soils, but its remediation efficiency is low and the energy consumption is high. It is necessary to add additional buffers or enhancers (solubilizers, chelating agents, etc.) to enhance the remediation effect.

[0053] However, even if additional buffer or additive is added, the remediation efficiency is still low. According to a study, when the remediation voltage is 30V and the remediation time is 96 hours, the Pb in the soil 2+ removal rate reached 40.83%, and the residual amount in the soil was 595mg / kg, which basically reached the standard of Class II exhibition land (residual amount in the soil <600mg / kg). In other words, it takes at least 96 hours to meet the basic requirements of soil remediation.

[0054] In summary, although EK technology has certain applications in soil remediation, its efficiency and energy consumption issues limit its widespread application. When the site area of ​​contaminated soil is large, the most common solution is still physical crushing combined with chemical remediation for in-situ remediation.

[0055] The embodiment of the present invention is used to provide an efficient and low-energy EK soil remediation solution. The technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0056] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Example

[0058] An embodiment of the present invention provides a land reclamation and restoration device for land resource management, including: an electrode plate, a contaminated area 1 having a flow channel 2 opened along the longitudinal direction, and the electrode plate is arranged in the flow channel 2; a heating plate 6, a mounting groove 3 opened along the transverse direction of the contaminated area 1, and the heating plate 6 is arranged in the mounting groove 3.

[0059] In this embodiment, a connecting assembly is also included, which is used to connect adjacent electrode plates and adjacent heating plates 6 in the vertical direction. The electrode plates and the heating plates 6 are connected by a clamping method, and the sizes of the electrode plates and the heating plates 6 are set to a small size. The overall working depth of the electrode plates and the heating plates 6 can be adjusted by adjusting the number of electrode plates and the heating plates 6 used.

[0060] In this embodiment, the connecting component includes: a clip 7, which is integrally arranged on the electrode plate and the heating plate 6 along the length direction, and a clip slot 8 is provided at the bottom of the electrode plate and the heating plate 6, and the clip 7 can be engaged with the clip slot 8; an integrated board 9, a first electrical connector 10 is provided on the side of the electrode plate and the heating plate 6, and a plurality of electrical connection holes 12 are provided on the side of the integrated board 9, when the first electrical connector 10 is inserted into the electrical connection hole 12, the clip 7 is connected to the integrated board 9; a second electrical connector 11 is provided on the integrated board 9 for connecting a power supply.

[0061] In this embodiment, the electrode plate and the heating plate 6 are basically the same in the clamping structure. Taking the heating plate 6 as an example, the clamping member 7 is T-shaped and is integrally arranged on the top of the heating plate 6. The card slot 8 is T-shaped and is arranged at the bottom of the heating plate 6. When two upper and lower adjacent heating plates 6 are clamped, the upper heating plate 6 clamps the card slot 8 into the clamping member 7 from left to right. After the clamping, the outer sides of the two upper and lower adjacent heating plates 6 are tightly fitted and located in the same vertical plane. At the top heating plate 6, there is a certain gap between the T-shaped clamping member 7 and the body of the heating plate 6, but this place is close to the ground surface and has little effect on the overall heating effect. The first electrical connector 10 of each heating plate 6 is located on the same side, and the integrated board 9 is provided with a plurality of electrical connection holes 12 corresponding to each first electrical connector 10.

[0062] In this embodiment, it also includes: a first electromagnet 13, which is arranged on the side of the electrode plate and the heating plate 6 and is spaced from the first electrical connector 10; a second electromagnet 14, which is arranged on the side of the integrated board 9, the first electromagnet 13 is connected to the first electrical connector 10, and the second electromagnet 14 is connected to the second electrical connector 11. When the first electrical connector 10 is inserted into the electrical connection hole 12, the first electromagnet 13 and the second electromagnet 14 are mutually adsorbed. The first electromagnet 13 and the second electromagnet 14 are not magnetic under the condition of no power, so when the second electrical connector 11 is powered off, the electrode plate and the heating plate 6 can be easily separated from the integrated board 9, which can improve the convenience of disassembly and assembly. In some other embodiments, the first electromagnet 13 or the second electromagnet 14 can also be replaced with a metal sheet, and the electrode plate, the heating plate 6 and the integrated board 9 are fixed by the electromagnet adsorbing the metal sheet. The purpose of setting two electromagnets is to improve the adsorption effect and increase the structural stability after multiple electrode plates or heating plates 6 are spliced ​​together.

[0063] In this embodiment, it also includes: a trenching machine 15, which has a trenching assembly capable of adjusting the trenching depth. The trenching assembly and the driving structure of the trenching machine 15 are prior art and are not described in detail here. The trenching machine 15 is used to open the flow channel 2 and the installation groove 3 in the polluted area 1, and adjust the working depth of the trenching assembly according to the depth of the flow channel 2 and the installation groove 3.

[0064] In this embodiment, it also includes: a soil sampling mechanism, which includes: a cylindrical collection tube 16, which is a cylindrical structure with a lower opening, and its lower edge has a serrated structure, which is conducive to the rapid insertion of the cylindrical collection tube 16 into the soil. The cylindrical collection tube 16 is provided with sampling holes through the inner and outer surfaces, and the output end of the rotating motor 17 is fixedly connected to the top of the cylindrical collection tube 16; the cylinder 18 is fixedly arranged on the outer side of the trencher 15, and the output end of the cylinder 18 is fixedly connected to the rotating motor 17. The sampling hole is used to take the sample out of the cylindrical collection tube 16 after the sampling is completed. In this embodiment, the outer surface of the cylindrical collection tube 16 can be provided with a scale, and the sample is simply divided into pollution intervals by the scale. When sampling, sampling is directly performed according to the divided pollution intervals, simplifying the sampling method, and also realizing partial sampling, and the remaining samples can be processed in a centralized manner.

[0065] In this embodiment, it also includes: a storage chamber 19, which is integrally arranged on the trenching machine 15 (the trenching assembly maintains a power connection structure with the trenching machine 15, and the power structure can be located inside the storage chamber 19 or outside the storage chamber 19, and the storage chamber 19 does not affect the normal use of the trenching assembly), which is used to store electrode plates, heating plates 6, power supplies and soil analyzers, and the soil analyzers are used to confirm the contamination depth of the contaminated area 1 based on samples. The various components used for soil remediation are integrated and stored on the trenching machine 15, which is convenient for transporting the trenching machine 15 to the contaminated area 1 as a whole, without the need for additional transportation tools.

[0066] In this embodiment, a rectangular pollution unit distributed in a matrix is ​​defined between the flow channel 2 and the mounting groove 3. An air hole 20 is opened at the center of the pollution unit. The air hole 20 is connected to the water vapor pipeline and inputs 100 degrees Celsius water vapor into the pollution unit.

[0067] The land reclamation and restoration method is described in detail below in combination with the above-mentioned restoration device, including the following steps:

[0068] S1: Collect samples in the polluted area 1 through a soil sampling mechanism, and divide the samples into multiple pollution intervals along the depth direction of the polluted area 1. The depths of the multiple pollution intervals are the same. For example, the sampling depth is one meter, and the pollution interval is set to 5 cm, for a total of 20. The samples of the multiple pollution intervals are sent to the soil analyzer in turn to analyze the soil pollution conditions of each pollution interval to confirm the pollution depth of the polluted area 1. For example, the pollution of 10 pollution intervals below the surface is more serious, and the 11th pollution interval below the surface meets the soil use standards, then the pollution depth is confirmed to be 0.5m.

[0069] S2: The flow channel 2 and the installation groove 3 are respectively opened in the contaminated area 1 along the longitudinal and transverse directions by the trenching machine 15; the depth of the flow channel 2 and the installation groove 3 corresponds to the depth of contamination, and the heating plate 6 and the electrode plate have the same thickness, so that the trenching machine 15 can complete the trenching work of the flow channel 2 and the installation groove 3 by the same trenching component; the distance between adjacent flow channels 2 is 60 cm, the distance between adjacent heating plates 6 is also 60 cm, and the depth of the flow channel 2 and the installation groove 3 corresponds to the depth of contamination.

[0070] S3: Determine the height of the electrode plate and the heating plate 6 according to the depth of the flow channel 2 and the installation groove 3, and splice the electrode plate and the heating plate 6 of the corresponding height.

[0071] S4: The electrode plate includes a cathode plate 4 and an anode plate 5, and the cathode plate 4 and the anode plate 5 are arranged in different flow channels 2; the cathode plate 4 is located between two adjacent anode plates 5 and the anode plate 5 is arranged in the two outermost flow channels 2, and the heating plate 6 is arranged in the mounting groove 3; in this way, a cathode plate 4 is arranged between any two adjacent anode plates 5, and a cathode plate 4 can form two DC electric fields on the left and right sides, and can also concentrate the pore water in the soil from both sides to the middle cathode plate 4, so as to facilitate the centralized treatment of the pore water in the later stage.

[0072] S3: A pollution unit is defined between the flow channel 2 and the mounting groove 3, and an air hole 20 is opened in the middle of the pollution unit. The air hole 20 can be opened directly using a sampling mechanism. The inner diameter of the air hole 20 is the outer diameter of the cylindrical collection tube 16. Other opening devices can also be used to open the hole, and the opening device can be stored in the storage chamber 19. The depth of the air hole 20 is 60%-70% of the pollution depth. In actual use, the pipe mouth of the water vapor pipeline is inserted into the deepest part of the air hole 20. After the water vapor enters the air hole 20, it diffuses evenly in multiple directions. Since the water vapor will naturally float, the total amount of water vapor diffused upward is more than the total amount of water vapor diffused downward. Setting the depth of the air hole 20 below the midline of the pollution depth can ensure that the water vapor distribution in the entire pollution unit is relatively uniform.

[0073] S4: The electrode plate and the heating plate 6 are energized, and at the same time, 100 degrees Celsius water vapor is input into the pollution unit through the pores 20. The 100 degrees Celsius water vapor is relatively easy to obtain, and does not require pressurization or additional heating. It can maintain both the temperature and humidity of the soil. A DC electric field is formed between the anode plate 5 and the cathode plate 4, and the charged pollutants in the pollution unit are enriched on the anode plate 5 or the cathode plate 4; the pore water in the pollution unit flows toward the cathode plate 4 under the action of the DC electric field, and the uncharged pollutants in the pollution unit flow with the pore water to the flow channel 2 where the cathode plate 4 is located; in addition to the above-mentioned electrodialysis and electromigration processes, the DC electric field can also produce electrophoresis and acid migration bands. Specifically, charged colloidal particles in the soil, including fine soil particles, humus and microbial cells, migrate under the action of an external electric field. Thereby, these colloidal particles and pollutants adsorbed on these particles can be removed. The H generated at the anode + , migrate to the cathode under the action of the DC electric field, which easily forms an acidic migration zone. The formation of the acidic migration zone promotes the desorption and dissolution of heavy metal ions from the soil surface and their migration.

[0074] S5: After the soil remediation of the polluted area 1 is completed, the electrode plates and pore water in the flow channel 2 are taken out, and the charged pollutants enriched on the anode plate 5 and the cathode plate 4, the uncharged pollutants in the pore water, and the contaminated soil produced by trenching and drilling are concentratedly treated. Compared with the entire polluted area 1, the volume of this part of the contaminated soil is very small, and the cost, energy consumption and time required for treatment using traditional physical and chemical combined technologies are relatively small, which has almost no impact on the overall remediation cost and energy consumption, and the chemical residues produced are almost negligible.

[0075] S6: Take out the heating plate 6, and fill the flow channel 2, the installation groove 3 and the air hole 20 with clean soil. The clean soil can be directly the contaminated soil treated in step S5, or clean soil can be collected from other areas.

[0076] In some embodiments, the distance between adjacent cathode plates 4 and anode plates 5 is 60 cm-100 cm, the voltage between the cathode plates 4 and anode plates 5 is 30-60 V, and the current density is 5-8 A / m 3 , the heating temperature of the heating plate 6 is 120-150 degrees Celsius. It should be noted that electrodialysis requires the soil to maintain a certain moisture content to achieve the flow of pore water. Generally speaking, if the temperature of the heating plate 6 is higher than 100 degrees Celsius, it will cause internal water to evaporate and electrodialysis cannot be achieved. However, this application inputs water vapor into the contaminated area 1 so that the soil moisture content is always sufficient. Therefore, the temperature of the heating plate 6 of this application can break through the limit and be set above 100 degrees Celsius, thereby greatly improving the speed of pollutant volatilization and migration. This is also the key factor that this application can shorten the repair time to within 24.

[0077] Experimental example

[0078] According to the "Technical Guidelines for Soil Remediation of Construction Land" issued by China's Ministry of Ecology and Environment and other relevant environmental protection laws and regulations.

[0079] The soil usage standards are as follows:

[0080] Cu content standard: 50mg / kg

[0081] Zn content standard: 200mg / kg

[0082] Cd content standard: 1.0mg / kg

[0083] Pb content standard: 100mg / kg

[0084] Soil exceeding the above standard content is considered contaminated soil. Different experimental conditions are used below to repair the contaminated area 1 and compare the repair effects.

[0085] Experimental conditions:

[0086] Experimental Group 1

[0087] Heating plate 6 temperature: 120.00℃

[0088] Electrode plate voltage: 30.00V

[0089] Current density: 5.00A / m 3

[0090] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0091] Experimental Group 2

[0092] Heating plate 6 temperature: 120.00℃

[0093] Electrode plate voltage: 40.00V

[0094] Current density: 6.00A / m 3

[0095] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0096] Experimental Group 3

[0097] Heating plate 6 temperature: 140.00℃

[0098] Electrode plate voltage: 40.00V

[0099] Current density: 6.00A / m 3

[0100] The distance between the cathode plate 4 and the anode plate 5 is 100 cm.

[0101] Experimental Group 4

[0102] Heating plate 6 temperature: 140.00℃

[0103] Electrode plate voltage: 40.00V

[0104] Current density: 6.00A / m 3

[0105] The distance between the cathode plate 4 and the anode plate 5 is 80 cm.

[0106] Experimental Group 5

[0107] Heating plate 6 temperature: 150.00℃

[0108] Electrode plate voltage: 60.00V

[0109] Current density: 8.00A / m 3

[0110] The distance between the cathode plate 4 and the anode plate 5 is 60 cm. The repair results are as follows:

[0111] Experimental Group 1:

[0112] Before repair

[0113] Cu content: 63.56mg / kg

[0114] Zn content: 240.34 mg / kg Cd content: 2.38 mg / kg

[0115] Pb content: 145.67 mg / kg

[0116] After Repair

[0117] Cu content: 49.82mg / kg Zn content: 190.50mg / kg Cd content: 1.02mg / kg Pb content: 98.76mg / kg Removal rate

[0118] Cu removal rate: 21.62% Zn removal rate: 20.71% Cd removal rate: 57.14% Pb removal rate: 32.06%

[0119] Repair time: 23.8h.

[0120] Experimental Group 2

[0121] Before repair

[0122] Cu content: 67.45mg / kg Zn content: 255.68mg / kg Cd content: 2.89mg / kg Pb content: 155.49mg / kg After restoration

[0123] Cu content: 48.32mg / kg Zn content: 120.45mg / kg Cd content: 0.45mg / kg Pb content: 89.67mg / kg Removal rate

[0124] Cu removal rate: 28.06% Zn removal rate: 52.94% Cd removal rate: 84.43% Pb removal rate: 42.31%

[0125] Repair time: 23.2h.

[0126] Experimental Group 3

[0127] Before repair

[0128] Cu content: 71.23mg / kg Zn content: 268.90mg / kg Cd content: 3.16mg / kg Pb content: 160.31mg / kg After restoration

[0129] Cu content: 47.56mg / kg Zn content: 110.23mg / kg Cd content: 0.38mg / kg Pb content: 85.49mg / kg Removal rate

[0130] Cu removal rate: 33.54% Zn removal rate: 59.01% Cd removal rate: 88.35% Pb removal rate: 46.71%

[0131] Repair time: 22.6h.

[0132] Experimental Group 4

[0133] Before repair

[0134] Cu content: 75.11mg / kg Zn content: 278.45mg / kg Cd content: 3.57mg / kg Pb content: 165.22mg / kg After restoration

[0135] Cu content: 46.78mg / kg Zn content: 100.12mg / kg Cd content: 0.30mg / kg Pb content: 80.34mg / kg Removal rate

[0136] Cu removal rate: 37.16% Zn removal rate: 64.34% Cd removal rate: 91.57% Pb removal rate: 51.43%

[0137] Repair time: 21.9h.

[0138] Experimental group 5 (best repair effect) before repair

[0139] Cu content: 78.94mg / kg Zn content: 288.76mg / kg Cd content: 3.98mg / kg

[0140] Pb content: 170.13 mg / kg

[0141] After Repair

[0142] Cu content: 45.95mg / kg

[0143] Zn content: 90.00 mg / kg

[0144] Cd content: 0.22mg / kg

[0145] Pb content: 75.65mg / kg

[0146] Removal rate

[0147] Cu removal rate: 41.70%

[0148] Zn removal rate: 68.77%

[0149] Cd removal rate: 94.47%

[0150] Pb removal rate: 55.56%

[0151] Repair time: 21.1h.

[0152] Data analysis

[0153] The remediation time for all groups was completed within 24 hours. In the above five sets of data, we can see that even in Experimental Group 1, where the remediation effect was relatively poor, the heavy metal content in the remediated soil reached the soil use standard. The remediation effects of Group 2, Group 3, Group 4, and Group 5 increased successively, and the heavy metal content in the remediated soil was significantly reduced, and the removal rate was also increased accordingly. This shows that by optimizing the working parameters of the device, the efficiency of soil remediation can be significantly improved, and rapid remediation can be achieved within 24 hours to meet the soil use standard. These data demonstrate the potential and effect of the device disclosed in this embodiment in the field of soil remediation.

[0154] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0155] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A land consolidation and restoration device used in land resource management, characterized in that: include: An electrode plate, wherein a flow channel (2) is provided in the contaminated area (1) along the longitudinal direction, and the electrode plate is arranged in the flow channel (2); A heating plate (6), a contaminated area (1) is provided with a mounting groove (3) in the transverse direction, and the heating plate (6) is arranged in the mounting groove (3).

2. A land reclamation and restoration device for land resource management according to claim 1, characterized in that: It also comprises a connecting assembly for connecting adjacent electrode plates and / or adjacent heating plates (6) in a vertical direction.

3. A land reclamation and restoration device for land resource management according to claim 2, characterized in that: The connection component comprises: A clamping member (7) is integrally arranged on the electrode plate and / or the heating plate (6) along the length direction; a clamping slot (8) is arranged at the bottom of the electrode plate and / or the heating plate (6); and the clamping member (7) can be clamped with the clamping slot (8); An integrated board (9), wherein a first electrical connector (10) is disposed on a side of the electrode plate and / or the heating plate (6), and a plurality of electrical connection holes (12) are disposed on a side of the integrated board (9), and when the first electrical connector (10) is inserted into the electrical connection hole (12), the clamping member (7) is connected to the integrated board (9); The second electrical connector (11) is arranged on the integrated board (9) and is used for connecting to a power supply.

4. A land reclamation and restoration device for land resource management according to claim 3, characterized in that: Also includes: A first electromagnet (13) is arranged on a side of the electrode plate and / or the heating plate (6) and is spaced apart from the first electrical connector (10); The second electromagnet (14) is arranged on the side of the integrated board (9), the first electromagnet (13) is connected to the first electrical connector (10), and the second electromagnet (14) is connected to the second electrical connector (11). When the first electrical connector (10) is inserted into the electrical connection hole (12), the first electromagnet (13) and the second electromagnet (14) are attracted to each other.

5. A land reclamation and restoration device for land resource management according to claim 4, characterized in that: Also includes: A trenching machine (15) has a trenching assembly capable of adjusting the trenching depth. The trenching machine (15) is used to open a flow channel (2) and an installation groove (3) in a polluted area (1).

6. A land reclamation and restoration device for land resource management according to claim 5, characterized in that: Also includes: A soil sampling mechanism, comprising: A cylindrical collecting tube (16), the cylindrical collecting tube (16) is a cylindrical structure with a lower opening, the lower edge of which has a sawtooth structure, and the cylindrical collecting tube (16) is provided with sampling holes through the inner and outer surfaces; A rotating motor (17), wherein the output end of the rotating motor (17) is fixedly connected to the top of the cylindrical collecting tube (16); A cylinder (18), wherein the cylinder (18) is fixedly arranged on the outer side surface of the trencher (15), and the output end of the cylinder (18) is fixedly connected to the rotating motor (17).

7. A land reclamation and restoration device for land resource management according to claim 6, characterized in that: Also includes: A storage chamber (19) is integrally arranged on the trenching machine (15) and is used to store the electrode plate, the heating plate (6), the power supply and the soil analyzer. The soil analyzer is used to confirm the contamination depth of the contaminated area (1) based on the sample.

8. The land reclamation and restoration device for land resource management according to claim 1, characterized in that: A pollution unit is defined between the flow channel (2) and the installation groove (3), and the pollution unit is provided with an air hole (20). The air hole (20) is connected to a water vapor pipeline and inputs water vapor into the pollution unit.

9. A land consolidation and restoration method applied to land resource management, characterized in that: The following steps are involved: S1: Collecting samples in the contaminated area (1) by a soil sampling mechanism, dividing the samples into a plurality of contaminated intervals along the depth direction of the contaminated area (1), and sending the samples of the plurality of contaminated intervals to a soil analyzer in sequence to confirm the contamination depth of the contaminated area (1); S2: using a trenching machine (15) to respectively open a flow channel (2) and a mounting groove (3) in the contaminated area (1) in the longitudinal and transverse directions; the depths of the flow channel (2) and the mounting groove (3) correspond to the depth of the contamination; S3: confirming the height of the electrode plate and the heating plate (6) according to the depth of the flow channel (2) and the mounting groove (3); S4: The electrode plate comprises a cathode plate (4) and an anode plate (5), and the cathode plate (4) and the anode plate (5) are arranged in different flow channels (2); the cathode plate (4) is located between two adjacent anode plates (5) and the anode plate (5) is arranged in the two outermost flow channels (2); and a heating plate (6) is arranged in the mounting groove (3); S3: a pollution unit is defined between the flow channel (2) and the mounting groove (3), an air hole (20) is provided in the middle of the pollution unit, and the depth of the air hole (20) is 60% to 70% of the pollution depth; S4: The electrode plate and the heating plate (6) are energized, and at the same time, 100 degrees Celsius water vapor is input into the pollution unit through the pores (20), so that a direct current electric field is formed between the anode plate (5) and the cathode plate (4), and the charged pollutants in the pollution unit are enriched on the anode plate (5) or the cathode plate (4); the pore water in the pollution unit flows toward the cathode plate (4) under the action of the direct current electric field, and the uncharged pollutants in the pollution unit flow with the pore water to the flow channel (2) where the cathode plate (4) is located; S5: After the soil remediation of the polluted area (1) is completed, the electrode plates and pore water in the flow channel (2) are taken out, and the charged pollutants accumulated on the anode plate (5) and the cathode plate (4) and the uncharged pollutants in the pore water are centrally treated; S6: The heating plate (6) is removed, and the flow channel (2), the installation groove (3) and the air hole (20) are backfilled with clean soil, and the excavated soil generated by opening the flow channel (2), the installation groove (3) and the air hole (20) is centrally processed.

10. A land consolidation and restoration method for land resource management according to claim 9, characterized in that: The distance between adjacent cathode plates (4) and anode plates (5) is 60cm-100cm, the voltage between the cathode plates (4) and anode plates (5) is 30-60V, and the current density is 5-8A / m 3 The heating temperature of the heating plate (6) is 120-150 degrees Celsius.

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