Electrokinetic remediation reactor for cadmium-contaminated soil

Abstract

The invention discloses an electrokinetic remediation reactor for cadmium-contaminated soil, and relates to the technical field of soil remediation. The middle ring is in limited sliding connection with an anode chamber, an outer ring is arranged on the side, away from an inner ring, of the middle ring, the outer ring is in limited sliding connection with the anode chamber, a cathode assembly is arranged at the interval between the inner ring and a cathode chamber, the cathode assembly is fixedly connected with the outer side face of the cathode chamber, and a mounting assembly is fixedly connected to the top of the inner ring. The inserting assembly is fixedly connected with the side, away from the mounting assembly, of the cathode chamber, electroosmotic flow is generated under the action of an electric field, cadmium ions are dissolved in soil pore water, the electroosmotic flow can drive the cadmium ions to move together, removal of cadmium from the contaminated soil is further promoted, and the middle ring and the outer ring are of a detachable structure. The remediation range can be changed, namely, soil at the original positions of the middle ring and the outer ring is increased, and the influence of different remediation ranges on experimental results is explored by changing the remediation range.

Description

Technical Field

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

[0002] Soil electrokinetic remediation is a technology that uses the principle of electrodynamics to remediate contaminated soil. By inserting electrodes into the contaminated soil and applying a DC electric field, the pollutants in the soil migrate under the action of the electric field, including electromigration, electroosmosis and other processes. At the same time, the acid-base changes caused by the electrode reaction can promote the desorption of pollutants from the surface of soil particles, thereby achieving the purpose of removing pollutants. It can be used to treat various types of contaminated soils such as heavy metal pollution and organic pollutant pollution. This technology can be repaired in situ, is also effective for low-permeability soils and can treat a variety of pollutants;

[0003] When repairing cadmium-contaminated soil, soil electrokinetic remediation is usually used. Cadmium ions are easier to desorb in an acidic environment, but when cadmium ions move in the soil, they will gradually transfer from the acidic environment produced by positive electrode reduction to the alkaline environment produced by negative electrode oxidation, which can easily cause cadmium ions to be adsorbed again, resulting in incomplete remediation. Therefore, we proposed an electrokinetic remediation reactor for cadmium-contaminated soil. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an electrokinetic remediation reactor for cadmium-contaminated soil, comprising:

[0005] An inner ring, wherein the outer side of the inner ring is fixedly connected to the anode chamber, and the center of the inner ring is provided with a cathode chamber;

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

[0007] Wherein, the repair mechanism comprises:

[0008] An intermediate ring, which is arranged outside the inner ring and is limitedly and slidably connected to the anode chamber;

[0009] An outer ring, which is arranged on a side of the middle ring away from the inner ring and is limitedly and slidably connected to the anode chamber;

[0010] A cathode assembly having a collecting structure for collecting the electroosmotic flow and cadmium ions generated by the reaction, wherein 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 of the cathode chamber;

[0011] A mounting assembly, wherein the mounting assembly is fixedly connected to the top of the inner ring;

[0012] An insertion component having a sawtooth structure for cutting off roots in the soil, wherein the insertion component is fixedly connected to a side of the cathode chamber away from the mounting component;

[0013] The cathode is passed through the installation component and inserted into the cathode chamber, and then the anode is inserted into the installation component. The position of the anode inside the installation component is adjusted, and the reactor is inserted into the ground. The soil to be repaired enters between the inner ring and the cathode component. Finally, both the anode and the cathode enter the ground. After power is turned on, the cadmium ions in the soil undergo electrical migration and move toward the electrode with the opposite charge, that is, toward the cathode chamber. At the same time, electroosmosis is generated under the action of the electric field, and the cadmium ions dissolve in the soil pore water. The electroosmosis 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, increase the soil at the original position of the middle ring and the outer ring. By changing the repair range, the influence of different repair ranges on the experimental results is explored.

[0014] Furthermore, a plurality of anode chambers are evenly distributed along the circumference of the cathode chamber, and intermediate rings and outer rings are provided at the intervals between adjacent anode chambers. Both sides of the intermediate ring and the outer ring are limitedly and slidably connected to the outer side surfaces of the anode chambers through dovetail grooves. By providing multiple anode chambers, a positive electric field can be evenly formed outside the soil to be repaired. The moisture in the soil close to the anode 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 in the soil close to the outermost side. In the acidic environment, cadmium ions adsorbed on the soil surface are more easily desorbed, thereby dissolving into the electroosmotic flow, thereby achieving more uniform cadmium pollution repair.

[0015] Furthermore, circular holes are opened on the surface of the inner ring, and the circular holes are arranged in several groups. 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 has several evenly distributed holes. The circular holes are arranged to allow electricity to seep and cadmium ions to pass through.

[0016] Furthermore, the cathode assembly includes an insert tube, a groove is provided on one side of the insert tube close to the mounting assembly, a seepage plate is fixedly connected to the inner side surface of the groove of the insert tube, a plurality of seepage plates are evenly distributed along the circumference of the insert tube, and the portions of the plurality of seepage plates located outside the insert tube form a cylindrical shape, the electroosmotic flow and cadmium ions pass through the soil, eventually contact the seepage plates, then enter the seepage plates, and finally converge at the gap between the insert tube and the cathode chamber, thereby completing the removal of cadmium ion pollution in the soil.

[0017] Furthermore, an elbow is fixedly connected to the side of the seepage plate close to the cathode chamber, the elbow is bent toward the side away from the mounting assembly, and a plurality of elbows are evenly distributed on the side of the seepage plate close to the cathode chamber, an arc groove is provided on the side of the cathode chamber close to the elbow, and the elbow is in contact with the arc groove, the electroosmotic flow enters the seepage plate and then enters the elbow, the elbow is bent toward the side away from the mounting assembly, that is, it is bent toward the direction of gravity, and in combination with gravity, the electroosmotic flow can be gathered faster, and in combination with the arc groove in contact with the elbow, the electroosmotic flow can be quickly gathered to the bottom of the insert, thereby ensuring the rapid collection of the electroosmotic flow and the treatment effect of cadmium pollution.

[0018] Furthermore, the mounting assembly includes a mounting plate, the bottom of which is fixedly connected to the end surface of the cathode chamber, a partition is fixedly connected to the side of the mounting plate close to the cathode chamber, both sides of the partition are slidingly connected to the inner ring and the side of the seepage plate close to each other, and a number of partitions are evenly distributed along the circumference of the mounting plate, and the soil inside the inner ring is divided into a number of fan-shaped parts. When the electroosmotic flow passes through, the contact with the soil is gradually reduced, 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] The cam is secured to the bottom of the mounting plate and is designed to engage the cam on a side of the mounting plate, the cam being secured to the bottom of the mounting plate and being rotatable thereon.

[0020] Furthermore, a suction tube is provided at the intervals between several of the seepage plates, an end of the suction tube close to the mounting plate passes 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 side of the mounting plate away from the inner ring is fixedly connected to a ring body, and an end of the suction tube away from the seepage plate is located inside the ring body, an inner side surface of the ring body is fixedly connected to a tube body, an end of the tube body away from the ring body is fixedly connected to a pump body, a surface of the pump body is fixedly connected to a side of the mounting plate away from the inner ring, a side of the pump body away from the tube body is fixedly connected to a connecting pipe, and the connecting pipe is controlled by a valve, the pump body is started, and the electroosmotic flow passes through the suction tube, the ring body, the tube body, the pump body and the connecting pipe in sequence, and finally the electroosmotic flow and the removal of cadmium ions are completed.

[0021] Furthermore, the insertion component includes a connecting frame, which is 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. The mounting plate is rotated, and 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 and achieve a positioning effect, thereby facilitating the insertion of the entire reactor into the ground.

[0022] Furthermore, a first tool holder is fixedly connected to a side of the connecting frame close to the drill bit, a first ring cutter is fixedly connected to a side of the first tool holder away from the connecting frame by bolts, a second tool holder is also fixedly connected to a side of the connecting frame close to the drill bit, and the second tool holder is arranged on a side of the first tool holder close to the drill bit, a second ring cutter is fixedly connected to a side of the second tool holder away from the connecting frame by bolts, the mounting plate rotates, driving the first tool holder and the second tool holder to rotate, and finally driving the first ring cutter and the second ring cutter to rotate, cutting the ground, thereby determining the repair position, and when there are plant roots underground, the roots can also be cut off to prevent the roots from obstructing the device from entering the underground, thereby facilitating in-situ repair, and the first ring cutter and the second ring cutter connected by bolts can be disassembled when adjusting the repair range.

[0023] The present invention has the beneficial effects:

[0024] 1. The present invention sets a repair mechanism to generate electroosmosis under the action of an electric field. Cadmium ions are dissolved in the soil pore water. The electroosmosis 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, increase the soil at the original position of the middle ring and the outer ring. By changing the repair range, the influence of different repair ranges on the experimental results is explored.

[0025] 2. The present invention can form a positive electric field uniformly outside the soil to be repaired by setting up an anode chamber or multiple anode chambers. The moisture in the soil close to the anode produces a reduction reaction to generate hydrogen ions, and the negative electrode produces an oxidation reaction to generate hydroxide ions, so that a uniform acidic environment is formed near the outermost side of the soil. In the acidic environment, the cadmium ions adsorbed on the soil surface are more easily desorbed and dissolved into the electroosmotic flow, thereby achieving more uniform cadmium pollution remediation.

[0026] 3. The present invention sets a cathode assembly, and the electroosmotic flow enters the seepage plate and then enters the elbow. The elbow is bent to the side away from the mounting assembly, that is, it is bent in the direction of gravity. Combined with gravity, the electroosmotic flow can be gathered faster. Combined with the arc groove in contact with the elbow, the electroosmotic flow can be quickly gathered to the bottom of the insert, ensuring the rapid collection of the electroosmotic flow and the treatment effect of cadmium pollution.

[0027] 4. The present invention divides the soil inside the inner ring into several fan-shaped parts by setting a partition, and 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. The present invention provides an insertion component, and the drill bit drills into the ground to determine the repair position and achieve a positioning effect, thereby facilitating the insertion of the entire reactor into the ground. When there are plant roots underground, the roots can also be cut off to prevent the roots from obstructing the device from entering the ground, thereby facilitating in-situ repair. The first ring knife and the second ring knife connected by bolts can be disassembled when adjusting the repair range. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of an electrokinetic remediation reactor for cadmium-contaminated soil according to the present invention;

[0030] Figure 2 It is a schematic diagram of the assembly structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the inner ring structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the cathode assembly structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the elbow structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the installation assembly of the present invention;

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

[0036] Figure 8It is a schematic diagram of the cross-sectional structure of the ring body of the present invention;

[0037] Fig. 9 It is a schematic diagram of the structure of the insertion assembly of the present invention;

[0038] Fig.10 It is a schematic diagram of the drill bit structure of the present invention.

[0039] In the figure: 1, inner ring; 2, anode chamber; 3, repair mechanism; 31, middle ring; 32, outer ring; 33, cathode assembly; 331, insert tube; 332, seepage plate; 333, elbow; 334, arc groove; 34, installation assembly; 341, installation plate; 342, partition; 343, take-up tube; 344, installation block; 345, slide rod; 346, sleeve ring; 347, fixing plate; 348, ring body; 349, tube body; 3410, pump body; 3411, connecting pipe; 35, insertion assembly; 351, connecting frame; 352, drill bit; 353, first tool holder; 354, first ring knife; 355, second tool holder; 356, second ring knife; 36, circular hole; 4, cathode chamber. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0041] Example 1, please refer to Figure 1-Figure 9 The present invention is an electrokinetic remediation reactor for cadmium-contaminated soil, comprising:

[0042] An inner ring 1, an anode chamber 2 is fixedly connected to the outer side of the inner ring 1, and a cathode chamber 4 is arranged at the center of the inner ring 1;

[0043] 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;

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

[0045] The middle ring 31 is arranged outside the inner ring 1, and the middle ring 31 is connected to the anode chamber 2 in a limited sliding manner;

[0046] The outer ring 32 is arranged on a side of the middle ring 31 away from the inner ring 1, and the outer ring 32 is limitedly slidably connected with the anode chamber 2;

[0047] 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;

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

[0049] An insertion component 35, the insertion component 35 having a sawtooth structure, used to cut off roots in the soil, and the insertion component 35 is fixedly connected to a side of the cathode chamber 4 away from the mounting component 34;

[0050] The cathode is passed through the installation component 34 and inserted into the cathode chamber 4, and then the anode is inserted into the installation component 34. The position of the anode inside the installation component 34 is adjusted, and the reactor is inserted into the ground. The soil to be repaired enters between the inner ring 1 and the cathode component 33. Finally, the anode and the cathode both enter the ground. After power is turned on, the cadmium ions in the soil undergo electrical migration and move toward the electrode with the opposite charge, that is, move toward the cathode chamber 4. At the same time, electroosmosis is generated under the action of the electric field, and the cadmium ions dissolve in the soil pore water. The electroosmosis 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, increase the soil at the original position of the middle ring 31 and the outer ring 32. By changing the repair range, the influence of different repair ranges on the experimental results is explored.

[0051] There are several anode chambers 2 evenly distributed along the circumference of the cathode chamber 4, and the intervals between adjacent anode chambers 2 are provided with intermediate rings 31 and outer rings 32. Both sides of the intermediate ring 31 and the outer ring 32 are connected to the outer side surface of the anode chamber 2 by dovetail grooves. By providing multiple anode chambers 2, a positive electric field can be evenly formed outside the soil to be repaired. The moisture in the soil near the anode produces a reduction reaction to generate hydrogen ions, and the negative electrode produces an oxidation reaction to generate hydroxide ions, so that a uniform acidic environment is formed near the outermost side of the soil. In the acidic environment, cadmium ions adsorbed on the soil surface are more easily desorbed, thereby dissolving into the electroosmotic flow, thereby achieving more uniform cadmium pollution remediation.

[0052] The inner ring 1 has circular holes 36 on its surface. The circular holes 36 are arranged in several groups. Each group of circular holes 36 is distributed on the surface of the inner ring 1 close to the middle ring 31, and each group of circular holes 36 has several evenly distributed holes. The circular holes 36 are arranged to allow electricity to seep and cadmium ions to pass through.

[0053] The cathode assembly 33 includes an insert tube 331, and 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 seepage plates 332 are evenly distributed along the circumference of the insert tube 331, and the portions of the plurality of seepage plates 332 located outside the insert tube 331 form a cylindrical shape. The electroosmotic flow and cadmium ions pass through the soil and eventually contact the seepage plates 332, then enter the seepage plates 332, and finally converge at the gap between the insert tube 331 and the cathode chamber 4, thereby completing the removal of cadmium ion pollution in the soil.

[0054] 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. The electroosmotic flow enters the seepage plate 332 and then enters the elbow 333. The elbow 333 is bent toward the side away from the mounting assembly 34, that is, it is bent toward the direction of gravity. With the help of gravity, the electroosmotic flow can be gathered faster. With the help of the arc groove 334 in contact with the elbow 333, the electroosmotic flow can be quickly gathered to the bottom of the insert 331, thereby ensuring the rapid collection of the electroosmotic flow and the treatment effect of cadmium pollution.

[0055] Example 2, please refer to Figure 1-Figure 10 The mounting assembly 34 includes 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 slidingly connected to the inner ring 1 and the side of the seepage plate 332 close to each other, and a number of partitions 342 are evenly distributed along the circumference of the mounting plate 341, and the several partitions 342 divide the soil inside the inner ring 1 into a number of fan-shaped parts. When the electroosmotic flow passes through, the contact with the soil is gradually reduced, 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, and a sliding rod 345 is symmetrically provided on one side of the mounting block 344 close to the center of the mounting plate 341. The end surface of the sliding rod 345 is fixedly connected to the side of the mounting block 344 close to the mounting plate 341, and the 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. A collar 346 is provided inside the mounting plate 341, and the sliding rod 345 passes through the collar 346, and the collar 346 is slidably connected to 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 is bent toward the center of the mounting plate 341, and the fixing plate 347 is made of an elastic material. The fixing plate 347 is distributed along the circumference of the inner side surface of the mounting plate 341. The positive electrode is inserted into the inside of the sleeve ring 346, and the positive electrode squeezes the fixing plate 347, and the fixing plate 347 is deformed. Under the elastic force of the fixing plate 347 to restore the deformation, the positive electrode is clamped to ensure the stability of the position of the positive electrode, and the driving sleeve ring 346 slides on the surface of the slide rod 345 to adjust 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 the middle ring 31 and the outer ring 32 are taken out.

[0057] A suction tube 343 is provided at the intervals of the plurality of seepage plates 332. The end of the suction tube 343 close to the mounting plate 341 penetrates the mounting plate 341 and the outer side of the mounting plate 341 is fixedly connected to the inner side of the mounting plate 341. The side of the mounting plate 341 away from the inner ring 1 is fixedly connected to a ring body 348. The end of the suction tube 343 away from the seepage plate 332 is located inside the ring body 348. The inner side of the ring body 348 is fixedly connected to a tube body 349. The tube body 349 is away from the inner ring 1. One end of the ring body 348 is fixedly connected to the 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, the side of the pump body 3410 away from the tube body 349 is fixedly connected to the connecting pipe 3411, and the connecting pipe 3411 is controlled by a valve. The pump body 3410 is started, and the electroosmotic flow passes through the suction tube 343, the ring body 348, the tube body 349, the pump body 3410, and the connecting pipe 3411 in sequence, and finally the electroosmotic flow and the removal of cadmium ions are completed.

[0058] The insertion component 35 includes a connecting frame 351, which is fixedly connected to the side of the cathode chamber 4 away from the mounting plate 341. The side of the connecting frame 351 away from the cathode chamber 4 is fixedly connected with a drill bit 352. The mounting plate 341 is rotated, and 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 and achieve a positioning effect, thereby facilitating the insertion of the entire reactor into the ground.

[0059] A first tool holder 353 is fixedly connected to a side of the connecting frame 351 close to the drill bit 352, and a first ring cutter 354 is fixedly connected to a side of the first tool holder 353 away from the connecting frame 351 by bolts. A second tool holder 355 is also fixedly connected to a side of the connecting frame 351 close to the drill bit 352, and 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 by bolts. The mounting plate 341 rotates, driving the first tool holder 353 and the second tool holder 355 to rotate, and finally driving the first ring cutter 354 and the second ring cutter 356 to rotate, cutting the ground to determine the repair position. When there are plant roots underground, the roots can also be cut off to prevent the roots from obstructing the device from entering the underground, thereby 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] When in use, the mounting plate 341 is rotated, and 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 and achieve the positioning effect. The mounting plate 341 rotates, drives the first knife holder 353 and the second knife holder 355 to rotate, and finally drives the first ring knife 354 and the second ring knife 356 to rotate to cut the ground, so as to determine the repair position. When there are plant roots underground, the roots can also be cut off to prevent the roots from hindering the device from entering the ground. The cathode is passed through the mounting assembly 34 and inserted into the cathode chamber 4. Then the anode is inserted into the mounting assembly 34. After power is turned on, the cadmium in the soil is separated. The ions generate electromigration and move toward the electrode with the opposite charge, that is, move toward the cathode chamber 4. Under the action of the electric field, electroosmosis is generated, and the cadmium ions are dissolved in the soil pore water. The electroosmosis drives the cadmium ions to move together. The electroosmosis and cadmium ions pass through the soil and finally contact the seepage plate 332 and then enter the seepage plate 332. The electroosmosis enters the seepage plate 332 and then enters the elbow 333. The electroosmosis is gathered at the tip of the elbow 333 under the action of gravity. The electroosmosis converges to the bottom of the insert 331, and the pump body 3410 is started. The electroosmosis passes through the suction tube 343, the ring body 348, the tube body 349, the pump body 3410, and the connecting tube 3411 in sequence, and finally the electroosmosis and the removal of cadmium ions are completed.

[0061] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

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 limited 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) has a sawtooth structure and is used to cut off roots and stems in the soil. The insertion component (35) is fixedly connected to a side of the cathode chamber (4) away from the mounting component (34).

2. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 1, characterized in that: 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), and both sides of the intermediate rings (31) and the outer rings (32) are limitedly slidably connected to the outer side surfaces of the anode chambers (2) via dovetail grooves.

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

4. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 3, characterized in that: 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.

5. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 4, 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).

6. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 5, 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).

7. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 6, 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).

8. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 7, 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.

9. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 8, 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).

10. The electrokinetic remediation reactor for cadmium-contaminated soil according to claim 9, 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.

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