An electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil

Abstract

The application discloses a kind of electroosmosis leaching-electrodehydration coupling repair systems for composite contaminated soil, including electroosmosis reaction chamber, central control device, the reaction cavity is opened inside the electroosmosis reaction chamber, the anode assembly is horizontally slidably arranged at one end of the reaction cavity, the cathode assembly is horizontally slidably arranged at the other end of the reaction cavity, the first wastewater collection structure is arranged at the outer side of the electroosmosis reaction chamber close to anode assembly one end;The integrated scheme of the present application is combined by electrically driven leaching and electro-dehydration, wherein the anode assembly and the cathode assembly integrate injection, water pumping, aeration, gas discharge and multi-parameter real-time sensing functions, and are intelligently cooperatively controlled by the central control device. This design enables the system to add reagents in stages and as needed during the repair process, remove enriched pollutants and reaction gases in a timely manner, and specifically treat composite pollution, forming a complete treatment process that is low in energy consumption, good in drying effect, free of secondary pollution and highly adaptable.

Description

Technical Field

[0001] This invention relates to the field of soil remediation technology, specifically to an electro-osmotic leaching-electro-dehydration coupled remediation system for complex contaminated soil. Background Technology

[0002] Among numerous soil remediation technologies, leaching remediation is widely used due to its high treatment efficiency and relatively short remediation cycle. This technology mainly involves adding leaching agents to the soil and using physical agitation or hydraulic flushing to desorb pollutants from soil particles and transfer them into the liquid phase, thereby purifying the soil. However, traditional leaching technology has revealed a series of inherent defects when treating soils rich in fine particles such as clay and silt. Fine-particle soils, due to their large specific surface area, high surface charge, and abundant adsorption sites, exhibit strong adsorption and fixation effects on pollutants, making conventional hydraulic leaching ineffective in separating and washing away pollutants from the particles. This not only leads to a significant reduction in remediation efficiency but also consumes large amounts of leaching agents, increasing remediation costs and creating a technical bottleneck. To overcome this challenge, electrodynamic remediation technology has been introduced and combined with leaching technology to form electrodynamic leaching technology. This technology applies a low-voltage DC electric field to both sides of the contaminated soil, utilizing electrodynamic effects such as electrodialysis, electromigration, and electrophoresis to drive the directional migration of soil pore water and pollutant ions or charged particles within it. When synergistic with suitable leaching agents, electrokinetic processes can significantly enhance the desorption and mass transfer efficiency of pollutants (especially those present in fine pores and on particle surfaces), allowing them to be more effectively enriched in the electrode region and extracted and removed, thereby greatly improving the remediation effect on small-particle soils. However, current remediation technologies combining electrokinetic remediation and leaching still have the following drawbacks:

[0003] Although electro-hydraulic leaching technology effectively solves the problem of removing contaminants from fine-particle soils, the continuous electroosmotic flow and leaching agent injection under the influence of an electric field result in extremely high water content in the treated soil, forming a near-plastic slurry. This high water content not only makes the soil volume enormous, making transportation and subsequent disposal extremely difficult, but also hinders subsequent solidification / stabilization processes, severely impacting the efficiency and effectiveness of the entire remediation chain. Therefore, rapid and effective dehydration of the small-particle soil after electro-hydraulic leaching is a crucial step in determining the successful engineering application of this technology. Currently, conventional natural drying or mechanical dehydration methods are ineffective for such fine-particle soils. Natural dehydration has a long cycle, which cannot meet the time requirements of engineering projects; while mechanical dehydration suffers from low dehydration efficiency and high energy consumption due to the low permeability and high compressibility of fine-particle soils.

[0004] To address these issues, we propose an electro-osmotic leaching-electro-dehydration coupled remediation system for complex contaminated soils. Summary of the Invention

[0005] The purpose of this invention is to provide an electro-osmotic leaching-electro-dehydration coupled remediation system for complex contaminated soils, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an electroosmotic leaching-electrodehydration coupled remediation system for composite contaminated soil, comprising an electroosmotic reaction chamber and a central control device, wherein a reaction chamber is opened inside the electroosmotic reaction chamber, an anode assembly is horizontally slidably disposed at one end of the reaction chamber, a cathode assembly is horizontally slidably disposed at the other end of the reaction chamber, a first wastewater collection structure is disposed outside the electroosmotic reaction chamber near the anode assembly, a second wastewater collection structure is disposed outside the electroosmotic reaction chamber near the cathode assembly, and a stirring structure is disposed on the top surface of the electroosmotic reaction chamber;

[0007] The anode assembly includes an anode plate, a first sealing frame fixedly sleeved on the outer side of the anode plate, a first surface filter fixedly connected to the inner side of the first sealing frame near the cathode assembly, the first sealing frame slidably sleeved in the reaction chamber, a first hollow cavity opened inside the anode plate, a plurality of first injection tubes uniformly fixedly connected to the upper part of the first hollow cavity, a plurality of first air circulation ports fixedly connected to the anode plate above the plurality of first injection tubes, a plurality of first water inlets fixedly connected to the anode plate below the plurality of first injection tubes, a plurality of first aeration ports fixedly connected to the anode plate below the plurality of first water inlets, a first sensor group fixedly embedded on the anode plate near the first surface filter, a first injection port fixedly connected to and connected to the bottom side wall of the first injection tube, and the end of the first injection port penetrating the side wall of the anode plate;

[0008] The cathode assembly includes a cathode plate, a second sealing frame fixedly sleeved on the outer side of the cathode plate, a second surface filter fixedly attached to the inner side of the second sealing frame near the anode assembly, the second sealing frame slidably sleeved in the reaction chamber, a second hollow cavity opened inside the cathode plate, a plurality of second injection tubes uniformly fixedly attached to the upper part of the second hollow cavity, a plurality of second air circulation ports fixedly attached to the cathode plate above the plurality of second injection tubes, a plurality of second water inlets fixedly attached to the cathode plate below the plurality of second injection tubes, a plurality of third water inlets fixedly attached to the cathode plate on both sides of the second injection tubes, a plurality of second aeration ports fixedly attached to the cathode plate below the plurality of second water inlets, a second sensor group fixedly embedded on the side of the cathode plate near the second surface filter, a second injection port fixedly attached to and connected to the bottom side wall of the second injection tube, the end of the second injection port penetrating the side wall of the cathode plate.

[0009] Preferably, a first controller is fixedly connected to the first hollow cavity near the first air circulation port, a second controller is fixedly connected to the first injection tube, a third controller is fixedly connected to the first hollow cavity near the first water intake port, a fourth controller is fixedly connected to the first hollow cavity near the first aeration port, a fifth controller is fixedly connected to the second hollow cavity near the second air circulation port, a sixth controller is fixedly connected to the second injection tube, a seventh controller is fixedly connected to the second hollow cavity near the second water intake port, an eighth controller is fixedly connected to the second hollow cavity near the second aeration port, and a heating plate is fixedly embedded on the side of the cathode plate away from the second hollow cavity.

[0010] The first wastewater collection structure includes a first pollutant collection tank, a first pollutant monitoring sensor group is fixedly connected inside the first pollutant collection tank, two wastewater pipes are fixedly connected to and connected to the side wall of the first pollutant collection tank, the ends of the wastewater pipes pass through the side wall of the electroosmosis reaction chamber and are fixedly connected to the side wall of the anode plate, and the two wastewater pipes are connected to multiple first water inlets.

[0011] Preferably, the second wastewater collection structure includes a second pollutant collection tank and a side chamber. The side chamber is fixedly connected to the side wall of the electroosmosis reaction chamber. A second pollutant monitoring sensor group is fixedly connected inside the second pollutant collection tank. The second pollutant collection tank is fixedly connected to and connected to four wastewater hoses. The wastewater hoses pass through the side chamber and the side wall of the electroosmosis reaction chamber and are fixedly connected to a cathode plate. The two upper wastewater hoses are connected to multiple third water inlets, and the two lower wastewater hoses are connected to multiple second water inlets. Four power components are provided on the side chamber corresponding to the positions of the four wastewater hoses.

[0012] Preferably, the power assembly includes an outer sleeve, an inner sleeve that is horizontally slidably sleeved on the inner side of the outer sleeve, the end of the wastewater hose that is fixedly sleeved on the inner side of the inner sleeve, the outer sleeve that is fixedly sleeved on the side wall of the side chamber and the electroosmosis reaction chamber, a side block that is fixedly embedded at the upper part of one end of the outer sleeve outside the electroosmosis reaction chamber, a lead screw that is horizontally rotatably connected to the middle of the side wall at the bottom end of the side block, a cylindrical cavity that is formed on the top surface of the inner sleeve corresponding to the position of the lead screw, a threaded sleeve that is fixedly connected to the end of the cylindrical cavity, and the lead screw that is threadedly connected to the threaded sleeve.

[0013] Preferably, two long guide posts are horizontally fixed to the bottom sidewall of the side block at both sides of the lead screw. The inner sleeve has long guide holes corresponding to the long guide posts. The long guide posts are slidably fitted into the long guide holes. A first servo reduction motor is fixed to the top surface of the outer sleeve end. The shaft end of the first servo reduction motor is located inside the side block and fixed to a first active synchronous pulley. A horizontal shaft is horizontally rotatably fitted to the bottom of the inner side block. The end of the horizontal shaft is fixed to the end of the lead screw. A first driven synchronous pulley is fixedly fitted on the horizontal shaft. A first synchronous belt is fitted on the first active synchronous pulley and the first driven synchronous pulley. A sealing ring is fixedly embedded in the inner side of the outer sleeve end. The sealing ring is fitted into the inner sleeve.

[0014] Preferably, the stirring structure includes a top chamber, four columns are fixedly connected between the four corners of the bottom surface of the top chamber and the four corners of the top surface of the electroosmosis reaction chamber, the bottom surface of the top chamber is fixedly connected to and connected to the feed inlet, the bottom end of the feed inlet is fixedly connected to the electroosmosis reaction chamber, the feed inlet is connected to the reaction chamber, the center of the bottom surface inside the top chamber is rotatably connected to the lower stirring shaft, the top end of the lower stirring shaft is rotatably connected to the upper stirring sleeve shaft, and multiple stirring blades are uniformly fixed to the periphery of the lower stirring shaft and the upper stirring sleeve shaft.

[0015] Preferably, the top surface of the top chamber is fixedly connected to the power chamber, the top surface of the power chamber is fixedly connected to the second servo reduction motor, the inner shaft is rotatably sleeved inside the upper stirring sleeve shaft, the bottom end of the inner shaft is fixedly connected to the top surface of the lower stirring shaft, the top end of the upper stirring sleeve shaft is located inside the power chamber, the top end of the inner shaft is located outside the upper stirring sleeve shaft, the drive shaft is vertically rotatably connected to the side of the power chamber away from the upper stirring sleeve shaft, the shaft end of the second servo reduction motor is fixedly connected to the top end of the drive shaft, the upper part of the drive shaft is fixedly sleeved with the second active synchronous pulley, the lower part of the drive shaft is fixedly sleeved with the third active synchronous pulley, the top end of the upper stirring sleeve shaft is fixedly sleeved with the first gear, the top end of the inner shaft is fixedly sleeved with the second driven synchronous pulley, the middle part of the power chamber is vertically rotatably connected to the central shaft, the lower part of the central shaft is fixedly sleeved with the second gear, the upper part of the central shaft is fixedly sleeved with the third driven synchronous pulley, the first gear meshes with the second gear, the second active synchronous pulley and the second driven synchronous pulley are sleeved with the second synchronous belt, and the third active synchronous pulley and the third driven synchronous pulley are sleeved with the third synchronous belt.

[0016] Preferably, the inlet is fixedly connected to and connected to the valve and the pump body, and the top surface of the top hopper is fixedly connected to and connected to the feeding port.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention achieves efficient and precise remediation and dehydration of highly water-content, complex-contaminated soil through a highly integrated and intelligent design. The system employs an integrated solution combining electrically driven rinsing and electro-dehydration. The anode and cathode components integrate chemical injection, water pumping, aeration, gas discharge, and multi-parameter real-time sensing functions, all intelligently and collaboratively controlled by a central control unit. This design allows the system to add chemicals in stages and as needed during the remediation process, promptly remove accumulated pollutants and reactive gases, effectively prevent electrode passivation and soil compaction, and specifically treat complex pollution. Simultaneously, the central control unit dynamically optimizes operating parameters based on feedback from various sensors and pollutant detection data, utilizing built-in numerical simulation to achieve intelligent operation and precise control throughout the entire process. Ultimately, this system organically combines the deep purification advantages of electroosmotic rinsing with the efficient drying advantages of electro-dehydration, forming a complete treatment process with low energy consumption, good drying effect, no secondary pollution, and strong adaptability. Attached Figure Description

[0019] Figure 1 These are schematic diagrams of the main body structure in the first and second embodiments of the present invention;

[0020] Figure 2 These are schematic diagrams of the cross-sectional structure of the electroosmosis reaction chamber in the first and second embodiments of the present invention;

[0021] Figure 3 These are exploded structural diagrams of the anode assembly in the first and second embodiments of the present invention;

[0022] Figure 4 These are schematic diagrams of the cross-sectional structure at the anode plate in the first and second embodiments of the present invention;

[0023] Figure 5 These are schematic diagrams of the exploded structure of the cathode assembly in the first and second embodiments of the present invention;

[0024] Figure 6 These are schematic diagrams of the cross-sectional structure at the cathode plate in the first and second embodiments of the present invention;

[0025] Figure 7 This is a cross-sectional view of the second wastewater collection structure in the first and second embodiments of the present invention;

[0026] Figure 8 These are schematic diagrams of the cross-sectional structure of the power component in the first and second embodiments of the present invention;

[0027] Figure 9 For the present invention Figure 8 Enlarged structural diagram of point A in the middle;

[0028] Figure 10 This is a cross-sectional view of the first wastewater collection structure in the first and second embodiments of the present invention;

[0029] Figure 11 These are cross-sectional structural diagrams of the stirring structure in the first and second embodiments of the present invention;

[0030] Figure 12 This is a cross-sectional structural diagram of the power compartment in the first and second embodiments of the present invention.

[0031] In the diagram: 1. Electroosmosis reaction chamber; 2. Central control device; 3. Anode assembly; 4. Cathode assembly; 5. First wastewater collection structure; 6. Second wastewater collection structure; 7. Stirring structure; 11. Reaction chamber; 31. Anode plate; 32. First sealing frame; 33. First surface filter; 34. First hollow cavity; 35. First injection pipe; 36. First air circulation port; 37. First water intake port; 38. First aeration port; 39. First sensor group; 310. First controller; 311. Second controller; 312. Third controller; 313. Fourth controller Device; 314, First injection port; 41, Cathode plate; 42, Second sealing frame; 43, Second surface filter; 44, Second hollow cavity; 45, Second injection pipe; 46, Second air circulation port; 47, Second water intake port; 48, Third water intake port; 49, Second aeration port; 410, Second sensor group; 411, Fifth controller; 412, Sixth controller; 413, Seventh controller; 414, Eighth controller; 415, Second injection port; 416, Heating plate; 51, First pollutant collection tank; 52, Wastewater pipe; 53, First pollutant monitoring... 61. Second pollutant collection tank; 62. Side compartment; 63. Wastewater hose; 64. Second pollutant monitoring sensor group; 65. Power assembly; 651. Outer sleeve; 652. Inner sleeve; 653. Sealing ring; 654. Side block; 655. Lead screw; 656. Cylindrical cavity; 657. Threaded sleeve; 658. Long guide post; 659. Long guide hole; 6510. First servo geared motor; 6511. First active synchronous pulley; 6512. Horizontal shaft; 6513. First driven synchronous pulley; 6514. First synchronous belt; 71. Top 71. Silo; 72. Feed inlet; 73. Lower stirring shaft; 74. Upper stirring sleeve shaft; 75. Stirring blade; 76. Power silo; 77. Inner shaft; 78. Second servo geared motor; 79. Drive shaft; 710. Second active synchronous pulley; 711. Third active synchronous pulley; 712. First gear; 713. Second driven synchronous pulley; 714. Central shaft; 715. Second gear; 716. Third driven synchronous pulley; 717. Feed port; 718. Pump body; 719. Valve; 720. Column; 721. Second synchronous belt; 722. Third synchronous belt. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] Please see Figure 1-12 This invention provides a technical solution: an electroosmotic leaching-electrodehydration coupled remediation system for composite contaminated soil, comprising an electroosmotic reaction chamber 1 and a central control device 2. The central control device 2 consists of a control module, an analysis module, and an operation module. It is responsible for coordinating the work of all execution components and can also optimize the operation strategy by analyzing the data detected by the sensor group and the pollutant sensor group and using the built-in numerical simulation system to achieve intelligent feedback regulation. A reaction chamber 11 is opened inside the electroosmotic reaction chamber 1. An anode assembly 3 is horizontally slidably arranged at one end of the reaction chamber 11, and a cathode assembly 4 is horizontally slidably arranged at the other end of the reaction chamber 1. A first wastewater collection structure 5 is arranged on the outside of the electroosmotic reaction chamber 1 near the anode assembly 3, and a second wastewater collection structure 6 is arranged on the outside of the electroosmotic reaction chamber 1 near the cathode assembly 4. A stirring structure 7 is arranged on the top surface of the electroosmotic reaction chamber 1.

[0035] The anode assembly 3 includes an anode plate 31. A first sealing frame 32 is fixedly sleeved on the outer side of the anode plate 31. A first surface filter 33 is fixedly connected to the inner side of the first sealing frame 32 near the cathode assembly 4. The first sealing frame 32 is slidably sleeved in the reaction chamber 11. A first hollow cavity 34 is opened inside the anode plate 31. Multiple first injection tubes 35 are uniformly fixed to the upper part of the first hollow cavity 34. Multiple first air circulation ports 36 are fixedly connected to the anode plate 31 above the multiple first injection tubes 35. Multiple first water inlets 37 are fixedly connected to the anode plate 31 below the multiple first injection tubes 35. Multiple first aeration ports 38 are fixedly connected to the anode plate 31 below the multiple first water inlets 37. A first sensor group 39 is fixedly embedded on the side of the anode plate 31 near the first surface filter 33. The bottom side wall of the first injection tube 35 is fixedly connected to and connected to the first injection port 314. The end of the first injection port 314 penetrates through the side wall of the anode plate 31.

[0036] The cathode assembly 4 includes a cathode plate 41. A second sealing frame 42 is fixedly sleeved on the outer side of the cathode plate 41. A second surface filter 43 is fixedly connected to the inner side of the second sealing frame 42 near the anode assembly 3. The second sealing frame 42 is slidably sleeved in the reaction chamber 11. A second hollow cavity 44 is opened inside the cathode plate 41. A plurality of second injection tubes 45 are uniformly fixed to the upper part of the second hollow cavity 44. A plurality of second air circulation ports 46 are fixedly connected to the cathode plate 41 above the plurality of second injection tubes 45. A plurality of second water inlets 47 are fixedly connected to the cathode plate 41 below the plurality of second injection tubes 45. A plurality of third water inlets 48 are fixedly connected to the cathode plate 41 on both sides of the second injection tubes 45. A plurality of third water inlets 49 are fixedly connected to the cathode plate 41 below the plurality of second water inlets 47. The second aeration port 49 and the second sensor group 410 are fixedly embedded on the side of the cathode plate 41 near the second surface filter 43. The bottom side wall of the second injection tube 45 is fixedly connected to and connected to the second injection port 415. The end of the second injection port 415 penetrates the side wall of the cathode plate 41. The anode assembly 3 and the cathode assembly 4 integrate the functions of injection, water pumping, aeration, gas discharge and real-time sensing of multiple parameters. The central control device 2 performs intelligent collaborative control, which enables the system to add agents in stages and as needed during the remediation process, remove the enriched pollutants and reactive gases in a timely manner, effectively prevent the electrode plate passivation and soil compaction, and treat compound pollution in a targeted manner. The first sensor group 39 and the second sensor group 410 are used to monitor key parameters such as temperature, pH value, conductivity and moisture content.

[0037] The first hollow cavity 34 is fixed to the first controller 310 near the first air circulation port 36. The second controller 311 is fixed to the first injection pipe 35. The first hollow cavity 34 is fixed to the third controller 312 near the first water intake port 37. The first hollow cavity 34 is fixed to the fourth controller 313 near the first aeration port 38. The second hollow cavity 44 is fixed to the fifth controller 411 near the second air circulation port 46. The second injection pipe 45 is fixed to the sixth controller 412. The second hollow cavity 44 is fixed to the seventh controller 413 near the second water intake port 47. The second hollow cavity 44 is fixed to the eighth controller 413 near the second aeration port 49. 14. A heating plate 416 is fixedly embedded on the side of the cathode plate 41 away from the second hollow cavity 44. The first controller 310 is used to control multiple first air circulation ports 36, the second controller 311 is used to control the first drug injection pipe 35, the third controller 312 is used to control multiple first water intake ports 37, the fourth controller 313 is used to control multiple first aeration ports 38, the fifth controller 411 is used to control multiple second air circulation ports 46, the sixth controller 412 is used to control the second drug injection pipe 45, the seventh controller 413 is used to control multiple second water intake ports 47 and multiple third water intake ports 48, and the eighth controller 414 is used to control the second aeration port 49.

[0038] The first wastewater collection structure 5 includes a first pollutant collection tank 51. A first pollutant monitoring sensor group 53 is fixedly connected inside the first pollutant collection tank 51. Two wastewater pipes 52 are fixedly connected to and connected to the side wall of the first pollutant collection tank 51. The ends of the wastewater pipes 52 pass through the side wall of the electroosmosis reaction chamber 1 and are fixedly connected to the side wall of the anode plate 31. The two wastewater pipes 52 are connected to multiple first water inlets 37. A pump body is installed on the wastewater pipes 52 to cooperate in suction.

[0039] The second wastewater collection structure 6 includes a second pollutant collection tank 61 and a side chamber 62. The side chamber 62 is fixed to the side wall of the electroosmosis reaction chamber 1. The second pollutant collection tank 61 is fixed to a second pollutant monitoring sensor group 64. The second pollutant collection tank 61 is fixed to and connected to four wastewater hoses 63. A pump body is installed on the wastewater hoses 63 to cooperate in suction. The wastewater hoses 63 pass through the side chamber 62 and the side wall of the electroosmosis reaction chamber 1 and are fixed to a cathode plate 41. The two upper wastewater hoses 63 are connected to multiple third water inlets 48, and the two lower wastewater hoses 63 are connected to multiple second water inlets 47. Four power units 65 are installed on the side chamber 62 corresponding to the positions of the four wastewater hoses 63.

[0040] The power assembly 65 includes an outer sleeve 651, an inner sleeve 652 that is horizontally slidably connected to the inner side of the outer sleeve 651, a wastewater hose 63 that is fixedly connected to the inner side of the inner sleeve 652 at its end, and an outer sleeve 651 that is fixedly connected to the side wall of the side chamber 62 and the electroosmotic reaction chamber 1. A side block 654 is fixedly embedded at the upper part of one end of the outer sleeve 651 outside the electroosmotic reaction chamber 1. A screw rod 655 is horizontally rotatably connected to the middle of the side wall at the bottom end of the side block 654. A cylindrical cavity 656 is opened on the top surface of the inner sleeve 652 corresponding to the position of the screw rod 655. A threaded sleeve 657 is fixedly connected to the end of the cylindrical cavity 656, and the screw rod 655 is threadedly connected to the threaded sleeve 657.

[0041] Two long guide posts 658 are horizontally fixed to the bottom side wall of the side block 654 on both sides of the lead screw 655. The inner sleeve 652 has a long guide hole 659 corresponding to the position of the long guide post 658. The long guide post 658 slides into the long guide hole 659. The top surface of the end of the outer sleeve 651 is fixed to the first servo reduction motor 6510. The shaft end of the first servo reduction motor 6510 is located inside the side block 654 and fixed to the first active synchronous pulley 6511. The bottom of the side block 654 is horizontally rotated and sleeved to the horizontal shaft 6512. The end of the horizontal shaft 6512 is fixed to the end of the lead screw 655. The first driven synchronous pulley 6513 is fixedly sleeved on the horizontal shaft 6512. The first synchronous belt 6514 is sleeved on the first active synchronous pulley 6511 and the first driven synchronous pulley 6513. The power component 65 is used to drive the cathode component 4 to move, so as to realize mechanical compression dehydration.

[0042] The stirring structure 7 includes a top chamber 71, with four columns 720 fixedly connected between the four corners of the bottom surface of the top chamber 71 and the four corners of the top surface of the electroosmosis reaction chamber 1. The bottom surface of the top chamber 71 is fixedly connected to and connected to the feed inlet 72. The bottom end of the feed inlet 72 is fixedly connected to the electroosmosis reaction chamber 1 and the feed inlet 72 is connected to the reaction chamber 11. The center of the bottom surface inside the top chamber 71 is rotatably connected to the lower stirring shaft 73. The top end of the lower stirring shaft 73 is rotatably connected to the upper stirring sleeve shaft 74. Multiple stirring blades 75 are evenly fixed to the periphery of the lower stirring shaft 73 and the upper stirring sleeve shaft 74.

[0043] A power chamber 76 is fixedly connected to the top surface of the top chamber 71. A second servo reduction motor 78 is fixedly connected to the top surface of the power chamber 76. An inner shaft 77 is rotatably sleeved inside the upper stirring sleeve shaft 74. The bottom end of the inner shaft 77 is fixedly connected to the top surface of the lower stirring shaft 73. The top end of the upper stirring sleeve shaft 74 is located inside the power chamber 76, and the top end of the inner shaft 77 is located outside the upper stirring sleeve shaft 74. A drive shaft 79 is vertically rotatably connected to the side of the power chamber 76 away from the upper stirring sleeve shaft 74. The shaft end of the second servo reduction motor 78 is fixedly connected to the top end of the drive shaft 79. A second active synchronous pulley 710 is fixedly sleeved on the upper part of the drive shaft 79, and a third active synchronous pulley 711 is fixedly sleeved on the lower part of the drive shaft 79. A first active synchronous pulley 710 is fixedly sleeved on the top end of the upper stirring sleeve shaft 74. Gear 712, the top of the inner shaft 77 is fixedly sleeved with the second driven synchronous pulley 713, the middle of the power chamber 76 is vertically rotatably connected to the central shaft 714, the lower part of the central shaft 714 is fixedly sleeved with the second gear 715, the upper part of the central shaft 714 is fixedly sleeved with the third driven synchronous pulley 716, the first gear 712 meshes with the second gear 715, the second driving synchronous pulley 710 and the second driven synchronous pulley 713 are sleeved with the second synchronous belt 721, the third driving synchronous pulley 711 and the third driven synchronous pulley 716 are sleeved with the third synchronous belt 722, the soil and the leaching agent are mixed in the top chamber 71, the stirring structure 7 adopts bidirectional stirring to ensure the uniformity of mixing.

[0044] The inlet 72 is fixedly connected to and connected to the valve 719 and the pump body 718, and the top surface of the top chamber 71 is fixedly connected to and connected to the feed port 717.

[0045] Example 2:

[0046] Please see Figure 1-12 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment. This embodiment takes high-moisture soil contaminated by petroleum hydrocarbons and copper as an example. In practice, the contaminated soil is first mixed with a specially prepared leaching agent, such as a compound solution of 0.1 mol / L citric acid and 0.3% sodium dodecyl sulfate, in the stirring structure 7 to form a slurry. Then, it is injected into the reaction chamber 11 through the feed inlet 72 to the highest liquid level, and the valve 719 is closed.

[0047] Subsequently, the fourth controller 313 and the eighth controller 414 are activated, controlling the first aeration port 38 on the anode plate 31 and the second aeration port 49 on the cathode plate 41 to perform aeration and stirring for 10 minutes, so that the soil and leaching agent are fully mixed. After completion, the aeration is turned off. Then, a DC electric field of 25V / m is applied to the anode plate 31 and the cathode plate 41 to start the electroosmotic leaching process. At this time, the first controller 310 and the fifth controller 411 simultaneously open the first air circulation port 36 and the second air circulation port 46 to promptly discharge the hydrogen and oxygen generated by electrolysis from the reaction chamber 11. Throughout the electroosmosis process, the first sensor group 39 and the second sensor group 410 work continuously, transmitting data such as temperature, pH, and conductivity to the central control device 2 in real time. If the central control device 2 detects that the pH value in the anode area is less than 3 or the pH value in the cathode area exceeds 11, it will instruct the system to briefly reverse the electrode polarity for 2 minutes to alleviate acid-base polarization. Every half hour, the first aeration port 38 and the second aeration port 49 are activated for 1 minute to uniformly disperse the soil particles that have settled and adsorbed on the first surface filter screen 33 and the second surface filter screen 43 in the reaction chamber 11. After about 5 hours of electroosmosis, the third controller 312 and the seventh controller 413 are activated, intermittently pumping the liquid containing high concentrations of pollutants near the two poles through 14 first pumping ports 37 and a total of 30 second pumping ports 47 and third pumping ports 48, respectively. The liquid is then introduced into the second pollutant collection tank 61 and the first pollutant collection tank 51 through the wastewater hose 63 and the wastewater pipe 52. The first pollutant monitoring sensor group 53 and the second pollutant monitoring sensor group 64 feed back the pollutant concentration data to the central control device 2. When the data shows that the petroleum hydrocarbon removal rate has slowed down, it will instruct the second controller 311 and the sixth controller 412 to activate the first injection port 314 and the second injection port 415 to inject a certain amount of sodium persulfate solution into the reaction chamber 11 to initiate the advanced oxidation process to enhance the degradation of organic pollutants.

[0048] When the central control device 2 determines that the concentration of pollutants in the soil is lower than the target value, the system enters the dehydration stage: First, the second wastewater collection structure 6 is activated and the suction function of the seventh controller 413 is strengthened to quickly remove most of the free water; after the free water is significantly reduced, the inner sleeve 652 in the power component 65 moves, pushing the cathode component 4 to squeeze the mud cake, while the heating plate 416 is activated to maintain 50°C, and the electro-osmotic dehydration is strengthened in a coordinated manner. During this process, the second sensor group 410 continuously monitors. When the average soil moisture content drops to about 35%, the central control device 2 commands the system to stop all dehydration operations. Finally, the anode component 3 is removed, and the repaired and dehydrated soil can be taken out.

[0049] Example 3:

[0050] Please see Figure 1-12This is the third embodiment of the present invention. This embodiment is based on the above two embodiments. This embodiment takes the high moisture content soil of a chemical plant site that is contaminated by a combination of hexavalent chromium and chlorinated hydrocarbons as the treatment object. At the beginning of the implementation process, the contaminated soil is mixed with a specially configured chemical remediation agent in the stirring structure 7. The remediation agent used in this case is a compound of 0.2 mol / L sodium acid pyrophosphate and 0.1% zero-valent iron nanoparticle suspension. The former is used to complex and dissolve chromium, and the latter is used to provide a reducing environment.

[0051] After the uniformly mixed slurry is pumped into the reaction chamber 11 through the feed inlet 72 to the predetermined liquid level, the valve 719 is closed. Unlike the oxidizing environment for treating petroleum hydrocarbons, this scheme first creates a reducing environment. Therefore, while applying a 15V / m DC electric field to start the electroosmosis process, the first injection port 314 and the second injection port 415 are activated through the second controller 311 and the sixth controller 412 to inject sodium dithionite solution into the reaction chamber 11 as a strong reducing agent, directly acting on and reducing hexavalent chromium. Every half hour, the first air circulation port 36 and the second air circulation port 46 are opened for exhaust, and at the same time, the first aeration port 38 and the second aeration port 49 are activated for 1 minute (the aeration gas is an inert gas such as nitrogen), so that the soil particles precipitated and adsorbed on the first surface filter screen 33 and the second surface filter screen 43 are uniformly dispersed in the reaction chamber 11. During the remaining time, the first air circulation port 36 and the second air circulation port 46, controlled by the first controller 310 and the fifth controller 411 respectively, remain closed to maintain the reducing atmosphere in the reaction chamber and prevent oxygen from entering and re-oxidizing the trivalent chromium.

[0052] After about 3 hours of electroosmosis, the central control device 2, based on the redox potential data fed back by the first sensor group 39 and the second sensor group 410, as well as the monitoring data of the second pollutant monitoring sensor group 64, determines that the reduction of hexavalent chromium is basically complete. At this time, the system strategy undergoes a key switch: the second controller 311 and the sixth controller 412 shut down the injection of reducing agent and instead inject a small amount of sodium hydroxide solution to adjust the soil pH to 8-9, so as to promote the formation of stable hydroxide precipitates of the generated trivalent chromium. At the same time, in order to enhance the degradation of chlorinated hydrocarbons, the system activates the heating plate 416 to maintain the temperature of the reaction zone at 40°C to activate the dechlorination activity of zero-valent iron. During this stage, the third controller 312 and the seventh controller 413 are activated, and the liquid containing excess reducing agent and some degradation intermediates is drawn through the first pump 37, the second pump 47 and the third pump 48 and discharged into the first pollutant collection tank 51 and the second pollutant collection tank 61.

[0053] When the detector data shows that the concentration of chlorinated hydrocarbons has dropped below the target, the system enters the dehydration stage. The dehydration operation in this stage is similar to that in the previous embodiment: the second wastewater collection structure 6 is activated and the suction function of the seventh controller 413 is enhanced. The inner sleeve 652 in the power component 65 moves, pushing the cathode component 4 to squeeze the mud cake. At the same time, the temperature of the heating plate 416 is raised to 60°C to accelerate the evaporation and migration of water. During the entire dehydration process, the system performs two brief electrode polarity reversals, each lasting 1 minute. This operation helps to disrupt the formed capillary channels and destroy the bound water, thereby enhancing the dehydration effect. When the second sensor group 410 detects that the soil moisture content has dropped to about 30%, the dehydration stops. Finally, the anode component 3 is removed and the stabilized and remediated soil is taken out.

[0054] This invention achieves efficient and precise remediation and dehydration of highly water-content, complex-contaminated soil through a highly integrated and intelligent design. The system adopts an integrated solution combining electrically driven rinsing and electro-dehydration. The anode assembly 3 and cathode assembly 4 integrate functions such as chemical injection, water pumping, aeration, gas discharge, and real-time multi-parameter sensing, and are intelligently coordinated and controlled by a central control device 2. This design enables the system to add chemicals in stages and as needed during the remediation process, promptly remove accumulated pollutants and reactive gases, effectively prevent electrode passivation and soil compaction, and specifically treat complex pollution. At the same time, based on feedback from various sensors and pollutant detection data, the central control device 2 uses built-in numerical simulation to dynamically optimize operating parameters, realizing intelligent operation and precise control throughout the entire process. Ultimately, the system organically combines the deep purification advantages of electroosmotic rinsing with the efficient drying advantages of electro-dehydration, forming a complete treatment process with low energy consumption, good drying effect, no secondary pollution, and strong adaptability.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electro-osmotic leaching-electro-dehydration coupled remediation system for complex contaminated soil, comprising an electro-osmotic reaction chamber and a central control device, characterized in that: An electroosmosis reaction chamber is opened inside. An anode assembly is horizontally slidably installed at one end of the reaction chamber, and a cathode assembly is horizontally slidably installed at the other end of the reaction chamber. A first wastewater collection structure is installed on the outer side of the electroosmosis reaction chamber near the anode assembly, and a second wastewater collection structure is installed on the outer side of the electroosmosis reaction chamber near the cathode assembly. A stirring structure is installed on the top surface of the electroosmosis reaction chamber. The anode assembly includes an anode plate, a first sealing frame fixedly sleeved on the outer side of the anode plate, a first surface filter fixedly connected to the inner side of the first sealing frame near the cathode assembly, the first sealing frame slidably sleeved in the reaction chamber, a first hollow cavity opened inside the anode plate, a plurality of first injection tubes uniformly fixedly connected to the upper part of the first hollow cavity, a plurality of first air circulation ports fixedly connected to the anode plate above the plurality of first injection tubes, a plurality of first water inlets fixedly connected to the anode plate below the plurality of first injection tubes, a plurality of first aeration ports fixedly connected to the anode plate below the plurality of first water inlets, a first sensor group fixedly embedded on the anode plate near the first surface filter, a first injection port fixedly connected to and connected to the bottom side wall of the first injection tube, and the end of the first injection port penetrating the side wall of the anode plate; The cathode assembly includes a cathode plate, a second sealing frame fixedly sleeved on the outside of the cathode plate, a second surface filter fixedly connected to the inside of the second sealing frame near the anode assembly, the second sealing frame slidably sleeved in the reaction chamber, a second hollow cavity opened inside the cathode plate, a plurality of second drug injection tubes uniformly fixedly connected to the upper part of the second hollow cavity, a plurality of second air circulation ports fixedly connected to the cathode plate above the plurality of second drug injection tubes, a plurality of second water inlets fixedly connected to the cathode plate below the plurality of second drug injection tubes, a plurality of third water inlets fixedly connected to the cathode plate on both sides of the second drug injection tubes, a plurality of second aeration ports fixedly connected to the cathode plate below the plurality of second water inlets, a second sensor group fixedly embedded on the side of the cathode plate near the second surface filter, a second drug injection port fixedly connected to and connected to the bottom side wall of the second drug injection tube, the end of the second drug injection port penetrating the side wall of the cathode plate, and a heating plate fixedly embedded on the side of the cathode plate away from the second hollow cavity; The second wastewater collection structure includes a second pollutant collection tank and a side chamber. The second pollutant collection tank is fixedly connected to and connected to four wastewater hoses. Four power components are installed on the side chamber corresponding to the positions of the four wastewater hoses. The power unit is used to drive the cathode assembly to move, thereby achieving mechanical compression and dehydration; The system integrates chemical injection, water pumping, aeration, gas discharge, and multi-parameter real-time sensing functions using anode and cathode components, and is intelligently coordinated and controlled by a central control device, enabling the system to add chemicals in stages and as needed during the repair process. When the central control device determines that the concentration of pollutants in the soil has fallen below the target value, the system enters the dehydration stage: first, the second wastewater collection structure is activated and the suction function is enhanced; after the free water is significantly reduced, the power component pushes the cathode component to squeeze the mud cake, and at the same time, the heating plate is activated to enhance electro-osmotic dehydration; finally, the anode component is removed, and the repaired and dehydrated soil can be taken out.

2. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 1, characterized in that: A first controller is fixedly connected to the first hollow cavity near the first air circulation port. A second controller is fixedly connected to the first injection pipe. A third controller is fixedly connected to the first hollow cavity near the first water intake port. A fourth controller is fixedly connected to the first hollow cavity near the first aeration port. A fifth controller is fixedly connected to the second hollow cavity near the second air circulation port. A sixth controller is fixedly connected to the second injection pipe. A seventh controller is fixedly connected to the second hollow cavity near the second water intake port. An eighth controller is fixedly connected to the second hollow cavity near the second aeration port.

3. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 1, characterized in that: The first wastewater collection structure includes a first pollutant collection tank, a first pollutant monitoring sensor group fixedly connected inside the first pollutant collection tank, two wastewater pipes fixedly connected and connected to the side wall of the first pollutant collection tank, the ends of the wastewater pipes passing through the side wall of the electroosmosis reaction chamber and fixedly connected to the side wall of the anode plate, and the two wastewater pipes connected to multiple first water inlets.

4. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 1, characterized in that: The side chamber is fixed to the side wall of the electroosmosis reaction chamber. The second pollutant monitoring sensor group is fixed in the second pollutant collection tank. The wastewater hose passes through the side chamber and the side wall of the electroosmosis reaction chamber and is fixed to the cathode plate. The two wastewater hoses located at the top are connected to multiple third water inlets, and the two wastewater hoses located at the bottom are connected to multiple second water inlets.

5. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 1, characterized in that: The power assembly includes an outer sleeve, an inner sleeve that slides horizontally on the inner side of the outer sleeve, a wastewater hose that is fixedly sleeved on the inner side of the inner sleeve, an outer sleeve that is fixedly sleeved on the side wall of the side chamber and the electroosmotic reaction chamber, a side block that is fixedly embedded at the upper part of one end of the outer sleeve outside the electroosmotic reaction chamber, a screw rod that is horizontally rotatably connected at the middle of the side wall at the bottom end of the side block, a cylindrical cavity that is opened on the top surface of the inner sleeve corresponding to the screw rod position, a threaded sleeve that is fixedly connected to the end of the cylindrical cavity, and the screw rod that is threadedly connected to the threaded sleeve.

6. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 5, characterized in that: Two long guide posts are horizontally fixed to the bottom sidewall of the side block at the positions on both sides of the lead screw. The inner sleeve has a long guide hole corresponding to the position of the long guide post. The long guide post slides into the long guide hole. The top surface of the outer sleeve is fixed to the first servo reduction motor. The shaft end of the first servo reduction motor is located inside the side block and fixed to the first active synchronous pulley. The bottom of the side block is horizontally rotated and sleeved to the horizontal shaft. The end of the horizontal shaft is fixed to the end of the lead screw. The first driven synchronous pulley is fixedly sleeved on the horizontal shaft. The first synchronous belt is sleeved on the first active synchronous pulley and the first driven synchronous pulley. A sealing ring is fixedly embedded on the inner side of the outer sleeve. The sealing ring is sleeved on the inner sleeve.

7. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 1, characterized in that: The mixing structure includes a top chamber, with four columns fixed between the four corners of the bottom surface of the top chamber and the four corners of the top surface of the electroosmosis reaction chamber. The bottom surface of the top chamber is fixed and connected to the feed inlet, the bottom end of the feed inlet is fixed to the electroosmosis reaction chamber, and the feed inlet is connected to the reaction chamber. The center of the bottom surface inside the top chamber is rotatably connected to the lower mixing shaft, the top of the lower mixing shaft is rotatably connected to the upper mixing sleeve shaft, and multiple mixing blades are evenly fixed around the lower mixing shaft and the upper mixing sleeve shaft.

8. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 7, characterized in that: The top surface of the top chamber is fixed to the power chamber, and the top surface of the power chamber is fixed to the second servo reduction motor. The inner shaft is rotatably sleeved inside the upper stirring sleeve shaft. The bottom end of the inner shaft is fixed to the top surface of the lower stirring shaft. The top end of the upper stirring sleeve shaft is located inside the power chamber, and the top end of the inner shaft is located outside the upper stirring sleeve shaft. The drive shaft is vertically rotatably connected to the side of the power chamber away from the upper stirring sleeve shaft. The shaft end of the second servo reduction motor is fixedly connected to the top end of the drive shaft. The upper part of the drive shaft is fixedly sleeved with the second active synchronous pulley, and the lower part of the drive shaft is fixedly sleeved with the third active synchronous pulley. The top end of the upper stirring sleeve shaft is fixedly sleeved with the first gear, and the top end of the inner shaft is fixedly sleeved with the second driven synchronous pulley. The middle part of the power chamber is vertically rotatably connected to the central shaft. The lower part of the central shaft is fixedly sleeved with the second gear, and the upper part of the central shaft is fixedly sleeved with the third driven synchronous pulley. The first gear meshes with the second gear. The second synchronous belt is sleeved on the second active synchronous pulley and the second driven synchronous pulley, and the third synchronous belt is sleeved on the third active synchronous pulley and the third driven synchronous pulley.

9. The electro-osmotic leaching-electro-dehydration coupled remediation system for composite contaminated soil according to claim 7, characterized in that: The feed inlet is fixedly connected to the valve and pump body, and the top surface of the top silo is fixedly connected to the feeding port.

Images