An electrokinetic remediation reactor for cadmium-contaminated soil

Abstract

The present invention discloses an electrokinetic remediation reactor for cadmium-contaminated soil, and the present invention relates to the technical field of soil remediation. The present invention includes an intermediate ring, which is connected to the anode chamber in a limited sliding manner. An outer ring is arranged on the side of the intermediate ring away from the inner ring, and the outer ring is connected to the anode chamber in a limited sliding manner. A cathode assembly is arranged at the interval between the inner ring and the cathode chamber, and the cathode assembly is fixedly connected to the outer side surface of the cathode chamber. An installation assembly is fixedly connected to the top of the inner ring, and an insertion assembly is fixedly connected to the side of the cathode chamber away from the installation assembly. Under the action of an electric field, electroosmotic flow is generated, cadmium ions are dissolved in the soil pore water, and the electroosmotic flow can drive the cadmium ions to move together, further promoting the removal of cadmium from the contaminated soil. The detachable structure of the intermediate ring and the outer ring can change the remediation range by disassembling the intermediate ring and the outer ring, that is, increasing the soil at the original positions of the intermediate ring and the outer ring. By changing the remediation range, the influence of different remediation ranges on the experimental results can be explored.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and particularly relates to an electrokinetic remediation reactor for cadmium-contaminated soil. Background Art

[0002] Soil electrokinetic remediation is a technology for remediating contaminated soil using the principle of electrokinetics. By inserting electrodes into the contaminated soil and applying a direct current electric field, the pollutants in the soil migrate under the action of the electric field, including processes such as electromigration and electroosmotic flow. At the same time, the acid-base changes caused by electrode reactions can promote the desorption of pollutants from the soil particle surface, thereby achieving the purpose of removing pollutants. It can be used to treat various types of contaminated soil, such as heavy metal pollution and organic pollutant pollution. This technology can be used for in-situ remediation, is effective for low-permeability soil, and can treat multiple pollutants.

[0003] When remediating cadmium-contaminated soil, soil electrokinetic remediation is usually adopted. Cadmium ions are more easily desorbed in an acidic environment. However, when cadmium ions move in the soil, they gradually transfer from the acidic environment generated by reduction at the positive electrode to the alkaline environment generated by oxidation at the negative electrode, which easily causes cadmium ions to be adsorbed again, resulting in incomplete remediation. Therefore, we propose an electrokinetic remediation reactor for cadmium-contaminated soil. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an electrokinetic remediation reactor for cadmium-contaminated soil, including:

[0005] An inner ring, the outer side surface of the inner ring is fixedly connected with an anode chamber, and a cathode chamber is arranged at the center of the inner ring;

[0006] A remediation mechanism, the bottom of the remediation mechanism is fixedly connected with the inner ring, the cathode chamber is fixedly connected to the bottom of the remediation mechanism, and the inner ring, the anode chamber, and the cathode chamber are all arranged inside the remediation mechanism;

[0007] Among them, the remediation mechanism includes:

[0008] An intermediate ring, the intermediate ring is arranged outside the inner ring, and the intermediate ring is in limit sliding connection with the anode chamber;

[0009] An outer ring, the outer ring is arranged on the side of the intermediate ring away from the inner ring, and the outer ring is in limit sliding connection with the anode chamber;

[0010] A cathode assembly, the cathode assembly has a collection structure for collecting the electroosmotic flow and cadmium ions generated by the reaction, the cathode assembly is arranged at the interval between the inner ring and the cathode chamber, and the cathode assembly is fixedly connected to the outer side surface of the cathode chamber;

[0011] An installation assembly, the installation assembly is fixedly connected to the top of the inner ring;

[0012] An insertion component with a serrated structure for cutting rhizomes in the soil, the insertion component is fixedly connected to the side of the cathode chamber away from the mounting component;

[0013] Insert the cathode through the mounting component and into the interior of the cathode chamber. Then insert the anode into the interior of the mounting component, adjust the position of the anode inside the mounting component, insert this reactor into the ground. The soil to be repaired enters between the inner ring and the cathode assembly. Finally, both the anode and the cathode enter the ground. After power-on, cadmium ions in the soil generate electro-migration and move towards the electrode with the opposite charge, that is, towards the cathode chamber. At the same time, under the action of the electric field, electro-osmotic flow is generated. Cadmium ions dissolve in the pore water of the soil, and the electro-osmotic flow can drive the cadmium ions to move together, further promoting the removal of cadmium from the contaminated soil. The detachable structure of the middle ring and the outer ring can change the repair range by disassembling the middle ring and the outer ring, that is, adding the soil at the original positions of the middle ring and the outer ring, and exploring the influence of different repair ranges on the experimental results.

[0014] Furthermore, a plurality of anode chambers are evenly distributed along the circumferential direction of the cathode chamber, and a middle ring and an outer ring are arranged at the intervals between adjacent anode chambers. Both sides of the middle ring and the outer ring are limited and slidably connected to the outer side surface of the anode chamber through dovetail grooves. Setting multiple anode chambers can uniformly form a positive electric field outside the soil to be repaired. In the soil near the anode, its moisture undergoes a reduction reaction to generate hydrogen ions, and the negative electrode undergoes an oxidation reaction to generate hydroxide ions, making the soil near the outermost side form a uniform acidic environment. Under the acidic environment, cadmium ions adsorbed on the soil surface are more likely to desorb and thus dissolve into the electro-osmotic flow, realizing a more uniform cadmium pollution repair.

[0015] Furthermore, circular holes are formed on the surface of the inner ring, and there are several groups of the circular holes. Each group of circular holes is distributed on the surface of the inner ring close to the middle ring, and each group of circular holes is evenly distributed with several. The circular holes are provided to allow the electro-osmotic flow and cadmium ions to pass through.

[0016] Furthermore, the cathode assembly includes an insertion cylinder. A groove is formed on the side of the insertion cylinder close to the mounting component. The inner side surface of the groove of the insertion cylinder is fixedly connected with a plurality of seepage plates evenly distributed along the circumferential direction of the insertion cylinder, and the parts of the plurality of seepage plates located outside the insertion cylinder form a cylinder shape. The electro-osmotic flow and cadmium ions pass through the soil, finally contact the seepage plates, then enter the seepage plates, and finally converge at the interval between the insertion cylinder and the cathode chamber, completing the removal of cadmium ion pollution in the soil.

[0017] Furthermore, on one side of the seepage plate close to the cathode chamber, there is a fixed elbow. The elbow is bent towards the side away from the installation component, and several elbows are evenly distributed on the side of the seepage plate close to the cathode chamber. On the side of the cathode chamber close to the elbow, there is an arc groove, and the elbow is in contact with the arc groove. Electroosmotic flow enters the seepage plate and then enters the elbow. The elbow is bent towards the side away from the installation component, that is, bent in the direction of gravity. Cooperating with gravity, it can make the electroosmotic flow converge faster. Then, cooperating with the arc groove in contact with the elbow, it can quickly make the electroosmotic flow converge to the bottom of the insertion cylinder, ensuring the rapid collection of electroosmotic flow and ensuring the treatment effect on cadmium pollution.

[0018] Furthermore, the installation component includes an installation plate. The bottom of the installation plate is fixedly connected to the end surface of the cathode chamber. On the side of the installation plate close to the cathode chamber, there is a fixed partition. The two sides of the partition are respectively slidably connected to the inner ring and the side of the seepage plate close to each other. Several partitions are evenly distributed along the circumference of the installation plate. The several partitions divide the soil inside the inner ring into several fan-shaped parts. When the electroosmotic flow passes through, the contact with the soil gradually decreases, which can reduce the adsorption of cadmium ions in the alkaline environment of the cathode chamber, thereby improving the removal effect of cadmium ions in the soil.

[0019] Furthermore, on the inner side surface of the installation plate, there is a fixed installation block. On one side of the installation block close to the center of the installation plate, there are symmetrically arranged sliding rods. The end surface of the sliding rod is fixedly connected to the side of the installation block close to the installation plate. The side of the sliding rod away from the installation block is fixedly connected to the inner side surface of the installation plate. Inside the installation plate, there is a collar. The sliding rod passes through the collar, and the collar is slidably connected to the sliding rod. On the inner side surface of the installation plate, there is a fixed plate. The fixed plate is bent towards the center of the installation plate and is made of an elastic material. The fixed plates are circumferentially distributed along the inner side surface of the installation plate. Insert the positive electrode into the inside of the collar. The positive electrode presses the fixed plate, and the fixed plate deforms. Under the elastic force of the fixed plate recovering its deformation, the positive electrode is clamped, thereby ensuring the stable position of the positive electrode. Drive the collar to slide on the surface of the sliding rod, thereby adjusting the insertion position of the positive electrode, so as to ensure that the soil is completely located between the positive electrode and the negative electrode when removing the middle ring and the outer ring.

[0020] Furthermore, extraction tubes are provided at the intervals between several of the seepage plates. One end of the extraction tube close to the mounting plate penetrates through the mounting plate, and the outer side surface of the mounting plate is fixedly connected to the inner side surface of the mounting plate. A ring body is fixedly connected to the side of the mounting plate away from the inner ring, and one end of the extraction tube away from the seepage plate is located inside the ring body. A tube body is fixedly connected to the inner side surface of the ring body. One end of the tube body away from the ring body is fixedly connected to a pump body. The surface of the pump body is fixedly connected to the side of the mounting plate away from the inner ring. A connecting tube is fixedly connected to the side of the pump body away from the tube body, and the connecting tube is controlled by a valve. When the pump body is started, the electroosmotic flow sequentially passes through the extraction tube, the ring body, the tube body, the pump body, and the connecting tube, and finally the removal of the electroosmotic flow and cadmium ions is completed.

[0021] Furthermore, the insertion assembly includes a connecting frame fixedly connected to the side of the cathode chamber away from the mounting plate. A drill bit is fixedly connected to the side of the connecting frame away from the cathode chamber. By rotating the mounting plate, the mounting plate drives the cathode chamber to rotate, drives the connecting frame to rotate, and finally drives the drill bit to rotate. The drill bit drills into the ground to determine the repair position, achieving a positioning effect, thereby facilitating the insertion of the entire reactor into the ground.

[0022] Furthermore, a first knife rest is fixedly connected to the side of the connecting frame close to the drill bit. A first ring knife is fixedly connected to the side of the first knife rest away from the connecting frame by bolts. A second knife rest is also fixedly connected to the side of the connecting frame close to the drill bit, and the second knife rest is arranged on the side of the first knife rest close to the drill bit. A second ring knife is fixedly connected to the side of the second knife rest away from the connecting frame by bolts. When the mounting plate rotates, it drives the first knife rest and the second knife rest to rotate, and finally drives the first ring knife and the second ring knife to rotate to cut the ground, thereby determining the repair position. When there are plant roots underground, it can also cut the roots to avoid the roots hindering the device from entering the underground, facilitating in-situ repair. The first ring knife and the second ring knife connected by bolts can be disassembled when adjusting the repair range.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. By setting up a repair mechanism, the present invention generates electroosmotic flow under the action of an electric field. Cadmium ions dissolve in the soil pore water, and the electroosmotic flow can drive the cadmium ions to move together, further promoting the removal of cadmium from contaminated soil. The detachable structure of the middle ring and the outer ring can change the repair range by disassembling the middle ring and the outer ring, that is, increasing the soil in the original positions of the middle ring and the outer ring. By changing the repair range, the influence of different repair ranges on the experimental results can be explored.

[0025] 2. By providing an anode chamber, multiple anode chambers, a positive electric field can be uniformly formed outside the soil to be repaired. In the soil near the anode, a reduction reaction occurs to the moisture, generating hydrogen ions, and an oxidation reaction occurs at the negative electrode to generate hydroxide ions, making the soil near the outermost side form a uniform acidic environment. Under the acidic environment, the cadmium ions adsorbed on the soil surface are more likely to desorb and thus dissolve into the electroosmotic flow, achieving a more uniform cadmium pollution remediation.

[0026] 3. By providing a cathode assembly, the electroosmotic flow enters the seepage plate and then enters the elbow. The elbow is bent away from the installation assembly, that is, bent in the direction of gravity. Cooperating with gravity, the electroosmotic flow can be gathered faster. Then, cooperating with the arc groove in contact with the elbow, the electroosmotic flow can be quickly converged to the bottom of the insertion cylinder, ensuring the rapid collection of the electroosmotic flow and ensuring the treatment effect on cadmium pollution.

[0027] 4. By providing a partition, several partitions, the soil inside the inner ring is divided into several fan-shaped parts. When the electroosmotic flow passes through, the contact with the soil gradually decreases, which can reduce the adsorption of cadmium ions in the alkaline environment of the cathode chamber, thereby improving the removal effect of cadmium ions in the soil.

[0028] 5. By providing an insertion assembly, the drill bit drills into the ground to determine the repair position, achieving a positioning effect, thus facilitating the insertion of the entire reactor into the ground. When there are plant roots underground, it can also cut off the roots to avoid the roots hindering the device from entering the ground, facilitating in-situ repair. The first ring cutter and the second ring cutter connected by bolts can be disassembled when adjusting the repair range. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the electrokinetic remediation reactor for cadmium-contaminated soil of the present invention;

[0030] Figure 2 Schematic diagram of the assembly structure of the present invention;

[0031] Figure 3 Schematic diagram of the inner ring structure of the present invention;

[0032] Figure 4 Schematic diagram of the cathode assembly structure of the present invention;

[0033] Figure 5 Schematic diagram of the elbow structure of the present invention;

[0034] Figure 6 Schematic diagram of the installation assembly structure of the present invention;

[0035] Figure 7 For the present invention Figure 6 Enlarged view of part A;

[0036] Figure 8Schematic cross-sectional structure diagram of the ring body of the present invention;

[0037] Figure 9 Schematic structure diagram of the insertion component of the present invention;

[0038] Figure 10 Schematic structure diagram of the drill bit of the present invention.

[0039] In the figure: 1, inner ring; 2, anode chamber; 3, repair mechanism; 31, intermediate ring; 32, outer ring; 33, cathode component; 331, insertion cylinder; 332, seepage plate; 333, elbow; 334, arc groove; 34, installation component; 341, installation plate; 342, partition board; 343, pipe taking; 344, installation block; 345, sliding rod; 346, collar; 347, fixing plate; 348, ring body; 349, pipe body; 3410, pump body; 3411, connecting pipe; 35, insertion component; 351, connecting frame; 352, drill bit; 353, first tool rest; 354, first ring cutter; 355, second tool rest; 356, second ring cutter; 36, round hole; 4, cathode chamber. Detailed implementation manners

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0041] Example 1, please refer to Figures 1-9 , the present invention is an electric repair reactor for cadmium-polluted soil, including:

[0042] Inner ring 1, the outer side surface of the inner ring 1 is fixedly connected with the anode chamber 2, and the cathode chamber 4 is arranged at the center of the inner ring 1;

[0043] Repair mechanism 3, the bottom of the repair mechanism 3 is fixedly connected with the inner ring 1, the cathode chamber 4 is fixedly connected to the bottom of the repair mechanism 3, and the inner ring 1, the anode chamber 2, and the cathode chamber 4 are all arranged inside the repair mechanism 3;

[0044] Among them, the repair mechanism 3 includes:

[0045] Intermediate ring 31, the intermediate ring 31 is arranged outside the inner ring 1, and the intermediate ring 31 is in limit sliding connection with the anode chamber 2;

[0046] Outer ring 32, the outer ring 32 is arranged on the side of the intermediate ring 31 away from the inner ring 1, and the outer ring 32 is in limit sliding connection with the anode chamber 2;

[0047] A cathode assembly 33, which has a collection structure for collecting the electroosmotic flow and cadmium ions generated by the reaction. The cathode assembly 33 is arranged at the interval between the inner ring 1 and the cathode chamber 4, and the cathode assembly 33 is fixedly connected to the outer side surface of the cathode chamber 4;

[0048] An installation assembly 34, which is fixedly connected to the top of the inner ring 1;

[0049] An insertion assembly 35, which has a serrated structure for cutting the rhizomes in the soil. The insertion assembly 35 is fixedly connected to the side of the cathode chamber 4 away from the installation assembly 34;

[0050] Insert the cathode through the installation assembly 34 and into the interior of the cathode chamber 4. Then insert the anode into the interior of the installation assembly 34, adjust the position of the anode inside the installation assembly 34, insert this reactor into the ground, the soil to be repaired enters between the inner ring 1 and the cathode assembly 33, and finally both the anode and the cathode enter the ground. After power-on, the cadmium ions in the soil generate electromigration and move towards the electrode with the opposite charge, that is, towards the cathode chamber 4. At the same time, an electroosmotic flow is generated under the action of the electric field. The cadmium ions dissolve in the soil pore water, and the electroosmotic flow can drive the cadmium ions to move together, further promoting the removal of cadmium from the contaminated soil. The detachable structure of the middle ring 31 and the outer ring 32 can change the repair range by disassembling the middle ring 31 and the outer ring 32, that is, adding the soil at the original positions of the middle ring 31 and the outer ring 32, and explore the influence of different repair ranges on the experimental results.

[0051] A number of anode chambers 2 are evenly distributed along the circumferential direction of the cathode chamber 4, and intermediate rings 31 and outer rings 32 are arranged at the intervals between adjacent anode chambers 2. Both sides of the intermediate ring 31 and the outer ring 32 are connected to the outer side surface of the anode chamber 2 in a limiting sliding manner through dovetail grooves. By arranging multiple anode chambers 2, a positive electric field can be uniformly formed outside the soil to be repaired. In the soil near the anode, the moisture undergoes a reduction reaction to generate hydrogen ions, and the negative electrode undergoes an oxidation reaction to generate hydroxide ions, so that a uniform acidic environment is formed near the outermost side of the soil. Under the acidic environment, the cadmium ions adsorbed on the soil surface are more likely to desorb and thus dissolve into the electroosmotic flow, realizing a more uniform cadmium pollution repair.

[0052] Round holes 36 are formed on the surface of the inner ring 1. There are several groups of round holes 36, and each group of round holes 36 is distributed on the surface of the inner ring 1 close to the intermediate ring 31, and each group of round holes 36 is evenly distributed with several. The round holes 36 are provided to allow the electroosmotic flow and cadmium ions to pass through.

[0053] The cathode assembly 33 includes an insertion cylinder 331. A groove is formed on one side of the insertion cylinder 331 close to the installation assembly 34. A seepage plate 332 is fixedly connected to the inner side surface of the groove of the insertion cylinder 331. A number of seepage plates 332 are evenly distributed along the circumferential direction of the insertion cylinder 331, and the parts of the number of seepage plates 332 located outside the insertion cylinder 331 form a cylinder. Electroosmotic flow and cadmium ions pass through the soil, finally contact the seepage plate 332, then enter the seepage plate 332, and finally converge at the interval between the insertion cylinder 331 and the cathode chamber 4, completing the removal of cadmium ion pollution in the soil.

[0054] A bent head 333 is fixedly connected to the side of the seepage plate 332 close to the cathode chamber 4. The bent head 333 is bent away from the installation assembly 34, and a number of bent heads 333 are evenly distributed on the side of the seepage plate 332 close to the cathode chamber 4. An arc groove 334 is formed on the side of the cathode chamber 4 close to the bent head 333, and the bent head 333 is in contact with the arc groove 334. The electroosmotic flow enters the seepage plate 332 and then enters the bent head 333. The bent head 333 is bent away from the installation assembly 34, that is, bent in the direction of gravity. With the cooperation of gravity, the electroosmotic flow can be converged faster. With the cooperation of the arc groove 334 in contact with the bent head 333, the electroosmotic flow can be quickly converged to the bottom of the insertion cylinder 331, ensuring the rapid collection of the electroosmotic flow and ensuring the treatment effect of cadmium pollution.

[0055] Example 2, please refer to Figures 1-10 , the installation assembly 34 includes an installation plate 341. The bottom of the installation plate 341 is fixedly connected to the end surface of the cathode chamber 4. A partition plate 342 is fixedly connected to the side of the installation plate 341 close to the cathode chamber 4. The two sides of the partition plate 342 are respectively slidably connected to the side of the inner ring 1 and the seepage plate 332 close to each other. A number of partition plates 342 are evenly distributed along the circumferential direction of the installation plate 341. The number of partition plates 342 divides the soil inside the inner ring 1 into several fan-shaped parts. When the electroosmotic flow passes through, the contact with the soil gradually decreases, which can reduce the adsorption of cadmium ions in the alkaline environment of the cathode chamber 4, thereby improving the removal effect of cadmium ions in the soil.

[0056] The inner side surface of the mounting plate 341 is fixedly connected with a mounting block 344. On one side of the mounting block 344 close to the center of the mounting plate 341, sliding rods 345 are symmetrically arranged. The end surface of the sliding rod 345 is fixedly connected with one side of the mounting block 344 close to the mounting plate 341. The side of the sliding rod 345 away from the mounting block 344 is fixedly connected with the inner side surface of the mounting plate 341. A collar 346 is arranged inside the mounting plate 341. The sliding rod 345 penetrates through the collar 346, and the collar 346 is slidably connected with the sliding rod 345. The inner side surface of the mounting plate 341 is fixedly connected with a fixing plate 347. The fixing plate 347 bends towards the center of the mounting plate 341, and the fixing plate 347 is made of an elastic material. The fixing plates 347 are distributed circumferentially along the inner side surface of the mounting plate 341. Insert the positive electrode into the inside of the collar 346. The positive electrode presses the fixing plate 347, and the fixing plate 347 deforms. Under the elastic force of the fixing plate 347 recovering from deformation, the positive electrode is clamped, thereby ensuring the stable position of the positive electrode. Drive the collar 346 to slide on the surface of the sliding rod 345, thereby adjusting the insertion position of the positive electrode, so as to ensure that the soil is completely located between the positive electrode and the negative electrode when removing the middle ring 31 and the outer ring 32.

[0057] Absorbing pipes 343 are arranged at intervals between several seepage plates 332. One end of the absorbing pipe 343 close to the mounting plate 341 penetrates through the mounting plate 341 and the outer side surface of the mounting plate 341 is fixedly connected with the inner side surface of the mounting plate 341. A ring body 348 is fixedly connected to the side of the mounting plate 341 away from the inner ring 1, and one end of the absorbing pipe 343 away from the seepage plate 332 is located inside the ring body 348. A pipe body 349 is fixedly connected to the inner side surface of the ring body 348. One end of the pipe body 349 away from the ring body 348 is fixedly connected with a pump body 3410. The surface of the pump body 3410 is fixedly connected to the side of the mounting plate 341 away from the inner ring 1. One side of the pump body 3410 away from the pipe body 349 is fixedly connected with a connecting pipe 3411, and the connecting pipe 3411 is controlled by a valve. Start the pump body 3410, and the electroosmotic flow passes through the absorbing pipe 343, the ring body 348, the pipe body 349, the pump body 3410, and the connecting pipe 3411 in sequence, and finally the electroosmotic flow and cadmium ions are removed.

[0058] The insertion assembly 35 includes a connecting frame 351. The connecting frame 351 is fixedly connected to the side of the cathode chamber 4 away from the mounting plate 341. A drill bit 352 is fixedly connected to the side of the connecting frame 351 away from the cathode chamber 4. Rotate the mounting plate 341. The mounting plate 341 drives the cathode chamber 4 to rotate, drives the connecting frame 351 to rotate, and finally drives the drill bit 352 to rotate. The drill bit 352 drills into the ground to determine the repair position, achieving a positioning effect, so as to facilitate the insertion of the entire reactor into the ground.

[0059] On one side of the connecting frame 351 close to the drill bit 352, a first tool rest 353 is fixedly connected. On the side of the first tool rest 353 away from the connecting frame 351, a first ring cutter 354 is fixedly connected by bolts. On one side of the connecting frame 351 close to the drill bit 352, a second tool rest 355 is also fixedly connected, and the second tool rest 355 is arranged on the side of the first tool rest 353 close to the drill bit 352. On the side of the second tool rest 355 away from the connecting frame 351, a second ring cutter 356 is fixedly connected by bolts. When the mounting plate 341 rotates, it drives the first tool rest 353 and the second tool rest 355 to rotate, and finally drives the first ring cutter 354 and the second ring cutter 356 to rotate to cut the ground, thereby determining the repair position. When there are plant roots underground, it can also cut off the roots to prevent the roots from hindering the device from entering the underground, facilitating in-situ repair. The first ring cutter 354 and the second ring cutter 356 connected by bolts can be disassembled when adjusting the repair range.

[0060] During use, rotate the mounting plate 341. The mounting plate 341 drives the cathode chamber 4 to rotate, drives the connecting frame 351 to rotate, and finally drives the drill bit 352 to rotate. The drill bit 352 drills into the ground to determine the repair position, achieving a positioning effect. The mounting plate 341 rotates, drives the first tool rest 353 and the second tool rest 355 to rotate, and finally drives the first ring cutter 354 and the second ring cutter 356 to rotate to cut the ground, thereby determining the repair position. When there are plant roots underground, it can also cut off the roots to prevent the roots from hindering the device from entering the underground. Insert the cathode through the mounting assembly 34 and into the cathode chamber 4. Subsequently, insert the anode into the mounting assembly 34. After power-on, cadmium ions in the soil generate electro-migration and move towards the electrode with the opposite charge, that is, towards the cathode chamber 4. Under the action of the electric field, an electro-osmotic flow is generated. Cadmium ions dissolve in the soil pore water, and the electro-osmotic flow drives the cadmium ions to move together. The electro-osmotic flow and cadmium ions pass through the soil and finally contact the seepage plate 332, and then enter the seepage plate 332. The electro-osmotic flow enters the seepage plate 332 and then enters the elbow 333. The electro-osmotic flow converges at the tip of the elbow 333 under the action of gravity. The electro-osmotic flow converges towards the bottom of the insertion cylinder 331. Start the pump body 3410, and the electro-osmotic flow passes through the extraction pipe 343, the ring body 348, the pipe body 349, the pump body 3410, and the connecting pipe 3411 in sequence, and finally completes the removal of the electro-osmotic flow and cadmium ions.

[0061] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art without special instructions and limitations.

Claims

1. An electrokinetic remediation reactor for cadmium-contaminated soil, characterized in that: include: An inner ring (1), the outer side surface of the inner ring (1) being fixedly connected to an anode chamber (2), and the center of the inner ring (1) being provided with a cathode chamber (4); A repair mechanism (3), wherein the bottom of the repair mechanism (3) is fixedly connected to the inner ring (1), the cathode chamber (4) is fixedly connected to the bottom of the repair mechanism (3), and the inner ring (1), the anode chamber (2), and the cathode chamber (4) are all arranged inside the repair mechanism (3); Wherein, the repair mechanism (3) comprises: An intermediate ring (31), the intermediate ring (31) being arranged outside the inner ring (1), and the intermediate ring (31) being connected to the anode chamber (2) in a position-limiting sliding manner; An outer ring (32), the outer ring (32) being arranged on a side of the middle ring (31) away from the inner ring (1), and the outer ring (32) being connected to the anode chamber (2) in a limited sliding manner; A cathode assembly (33), the cathode assembly (33) having a collection structure for collecting the electroosmotic flow and cadmium ions generated by the reaction, the cathode assembly (33) being arranged at the interval between the inner ring (1) and the cathode chamber (4), and the cathode assembly (33) being fixedly connected to the outer side surface of the cathode chamber (4); A mounting assembly (34), wherein the mounting assembly (34) is fixedly connected to the top of the inner ring (1); An insertion component (35) having a sawtooth structure for cutting off roots and stems in the soil, wherein the insertion component (35) is fixedly connected to a side of the cathode chamber (4) away from the mounting component (34); A plurality of anode chambers (2) are evenly distributed along the circumference of the cathode chamber (4), and intermediate rings (31) and outer rings (32) are provided at intervals between adjacent anode chambers (2); A circular hole (36) is provided on the surface of the inner ring (1); The cathode assembly (33) comprises an insert tube (331), a groove is provided on one side of the insert tube (331) close to the mounting assembly (34), a seepage plate (332) is fixedly connected to the inner side surface of the groove of the insert tube (331), a plurality of the seepage plates (332) are evenly distributed along the circumference of the insert tube (331), and the portions of the plurality of the seepage plates (332) located outside the insert tube (331) form a cylindrical shape.

2. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 1, characterized in that: Both sides of the intermediate ring (31) and the outer ring (32) are connected to the outer side surface of the anode chamber (2) in a limited sliding manner through dovetail grooves.

3. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 2, characterized in that: The circular holes (36) are arranged in a plurality of groups, each group of the circular holes (36) is distributed on the surface of the inner ring (1) close to the middle ring (31), and each group of the circular holes (36) has a plurality of evenly distributed holes.

4. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 1, characterized in that: An elbow (333) is fixedly connected to the side of the seepage plate (332) close to the cathode chamber (4); the elbow (333) is bent toward the side away from the mounting assembly (34); and a plurality of elbows (333) are evenly distributed on the side of the seepage plate (332) close to the cathode chamber (4); an arc groove (334) is provided on the side of the cathode chamber (4) close to the elbow (333); and the elbow (333) is in contact with the arc groove (334).

5. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 4, characterized in that: The mounting assembly (34) comprises a mounting plate (341), the bottom of which is fixedly connected to the end surface of the cathode chamber (4), a partition (342) is fixedly connected to the side of the mounting plate (341) close to the cathode chamber (4), and both sides of the partition (342) are respectively slidably connected to the inner ring (1) and the side of the seepage plate (332) close to each other, and a plurality of partitions (342) are evenly distributed along the circumference of the mounting plate (341).

6. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 5, characterized in that: The inner side surface of the mounting plate (341) is fixedly connected to a mounting block (344); a sliding rod (345) is symmetrically arranged on one side of the mounting block (344) close to the center of the mounting plate (341); an end surface of the sliding rod (345) is fixedly connected to the side of the mounting block (344) close to the mounting plate (341); a side of the sliding rod (345) away from the mounting block (344) is fixedly connected to the inner side surface of the mounting plate (341); and the mounting plate (341) is fixedly connected to the inner side surface of the mounting plate (341). A collar (346) is arranged inside, the slide bar (345) passes through the collar (346), and the collar (346) is slidably connected to the slide bar (345), the inner side surface of the mounting plate (341) is fixedly connected with a fixing plate (347), the fixing plate (347) is bent toward the center of the mounting plate (341), and the fixing plate (347) is made of elastic material, and the fixing plates (347) are distributed along the circumference of the inner side surface of the mounting plate (341).

7. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 6, characterized in that: A suction tube (343) is provided at intervals between the plurality of seepage plates (332); one end of the suction tube (343) close to the mounting plate (341) penetrates the mounting plate (341), and the outer side surface of the mounting plate (341) is fixedly connected to the inner side surface of the mounting plate (341); a ring body (348) is fixedly connected to the side of the mounting plate (341) away from the inner ring (1), and one end of the suction tube (343) away from the seepage plate (332) is located at the ring body (3 48), the inner side surface of the ring body (348) is fixedly connected to a tube body (349), one end of the tube body (349) away from the ring body (348) is fixedly connected to a pump body (3410), the surface of the pump body (3410) is fixedly connected to a side of the mounting plate (341) away from the inner ring (1), the side of the pump body (3410) away from the tube body (349) is fixedly connected to a connecting pipe (3411), and the connecting pipe (3411) is controlled by a valve.

8. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 7, characterized in that: The insertion assembly (35) comprises a connecting frame (351), the connecting frame (351) being fixedly connected to a side of the cathode chamber (4) away from the mounting plate (341), and a drill bit (352) being fixedly connected to a side of the connecting frame (351) away from the cathode chamber (4).

9. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 8, characterized in that: A first tool holder (353) is fixedly connected to a side of the connecting frame (351) close to the drill bit (352); a first ring cutter (354) is fixedly connected to a side of the first tool holder (353) away from the connecting frame (351) via bolts; a second tool holder (355) is also fixedly connected to a side of the connecting frame (351) close to the drill bit (352); the second tool holder (355) is arranged on a side of the first tool holder (353) close to the drill bit (352); and a second ring cutter (356) is fixedly connected to a side of the second tool holder (355) away from the connecting frame (351) via bolts.

Images