JP7182034B1 - Apparatus and method for remediation of cadmium contaminated soil - Google Patents

Abstract

A device and method for remediation of cadmium-contaminated soil are provided that can remediate large-scale cadmium-contaminated soil on-site and improve the quality of soil remediation over conventional techniques. A device includes a hydraulic control device (1) whose one end is connectable to a moving vehicle, a mounting frame (2) provided at the other end of the hydraulic control device (1), a repair device provided on the mounting frame (2), and The remediation device includes a soil desorption assembly 3 fixedly mounted below the mounting frame 2, a soil breaking assembly 4 disposed at the front end of the soil desorption assembly 3, and a joint remediation mounted at the rear end of the soil desorption assembly 4. An assembly 5, wherein the soil desorption assembly 3 includes a desorption chamber, a first crushing assembly, a desorption agent jetting assembly, the method comprising: S1, connecting a mobile vehicle; S2, cadmium desorption; S3, joint remediation of soil. include. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the technical field of cadmium contaminated soil remediation, and in particular to an apparatus and method for remediating cadmium contaminated soil.

Soil contamination with the heavy metal cadmium is highly dangerous, highly toxic, stable and
It is difficult to remove, and causes include leaks from underground storage tanks, overuse of pesticides and insecticides, and leaching of waste from landfill sites. Mainly physical repair, chemical drenching and phytoremediation.
The chemical drenching device provided by the existing technology can only spray the remediation agent on the soil surface,
Due to problems such as soil solidification and high outdoor temperature, it is difficult for soil remediation agents to enter the soil, and the remediation effect is poor. There is a problem that it is inconvenient for repair processing.

The technical problem to be solved by the present invention is that the conventional technology cannot remediate large-scale cadmium-contaminated soil outdoors, and the remediation equipment provided by the prior art has poor soil remediation effects. is.

The technical solution of the present invention is a device for remediation of cadmium-contaminated soil, comprising: a hydraulic control device, one end of which can be connected to a mobile vehicle; a mounting frame provided at the other end of the hydraulic control device; including a repair device fitted to
The remediation device includes a soil desorption assembly fixedly mounted below the mounting frame, a soil breaking assembly disposed at the front end of the soil desorption assembly, and a combined remediation assembly mounted at the rear end of the soil desorption assembly. including
The soil desorption assembly comprises two cylindrical desorption chambers arranged in parallel under the mounting frame, a first crushing assembly arranged at the front end of the desorption chamber, and a crushed soil arranged in the desorption chamber. including a desorption drug ejection assembly for ejecting a drug;
The combined repair assembly comprises a central partition vertically installed between two desorption chambers, two lateral card plates respectively installed on the outer surfaces of the desorption chambers, an electrolytic assembly, and a complexing repair assembly positioned horizontally beneath said central divider;
The front end of the side card plate is fixedly connected to the detachable chamber, the rear end is adjacent to the central partition, and a fixed connection rack is provided between the rear end of the side card plate and the central partition,
The electrolysis assembly includes a plurality of sets of first mounting grooves uniformly and vertically provided on the side surface of the central partition plate, a plurality of sets of second mounting grooves provided uniformly and vertically on the side card plate, the first a cathode electrode provided in the mounting groove and an anode electrode provided in the second mounting groove;
a power source electrically connected to the cathode electrode and the anode electrode is provided on the moving vehicle;
The complexing repair assembly includes a reaction tank fixedly provided below the central partition;
a second ejector provided at the front end of the reaction tank capable of ejecting a complexing agent, a soil outlet provided at the rear end of the reaction tank, and a mixing assembly provided within the reaction tank;
The mixing assembly comprises a rotary shaft provided in the reaction tank, the front end of which is adjacent to the second ejector, and the rear end of which is connected to the soil outlet, a mixing agitator provided in the front half of the rotary shaft; It includes a spiral ejector located on the rear half of the rotating shaft and a power motor that drives the rotating shaft.
As one aspect of the present invention, the reaction tank is a V-shaped groove, both surfaces of the V-shaped groove contacting the soil are arc surfaces,
A soil baffle connected to a central partition is provided at the upper end of said V-shaped groove.
Illustratively, by providing a soil baffle, the electrically remedied soil penetrates into the V-shaped grooves to promote complexing reactions and treat the heavy metal cadmium.
An aspect of the invention includes a side soil breaking device mounted between two said side card plates and a central divider;
The side soil breaking device comprises a fixed connection rack installed in the desorption chamber, a driving rotation shaft installed in the fixed connection rack and parallel to the side card plate, and an axial direction of the driving rotation shaft installed in the driving rotation shaft. a plurality of soil breaking turbofans evenly distributed along the ridge, and a rotary motor provided on said fixed connection rack for driving the soil breaking turbofans.
To explain, the rotation of the soil breaking turbofans of the side soil breaking devices drives the electrically remedied soil into the central partition and forces the soil into the V-shaped grooves, causing the soil to break down in the V-shaped grooves. accelerates the conversion reaction.
In one aspect of the present invention, the desorption agent ejection assembly includes an ejector mounting ring provided on the inner wall of the desorption chamber and having a center axis overlapping the center axis of the desorption chamber, 1 ejector, and a first powered pump disposed between the desorption chambers and in communication with said first ejector;
The first powered pump is connected to a drug reservoir provided on the mobile vehicle.
To explain, by injecting the desorption agent into the soil from the desorption agent ejection assembly, the desorption agent forms cadmium ions with the cadmium adsorbed on the soil, separates the cadmium from the soil, and forms a large amount of electrical remediation. Cadmium ions can be transferred to the cathode electrode of the central partition and finally treated with a complexing agent.
As one aspect of the present invention, the ejection direction of the desorption chemical from the first ejector coincides with the soil movement direction,
In other words, when the direction of movement of the desorbed chemical ejected from the first ejector coincides with that of the soil, it is possible to avoid clogging the first ejector with soil, which is disadvantageous for injecting the desorbed chemical.
In one aspect of the invention, the first crushing assembly includes a rotating ring at the front end material inlet of the desorption chamber and rotating blades within the rotating ring;
The rotating blades can drive soil into the desorption chamber.
To explain, the rotating blades not only crush the soil, but also push the soil into the desorption chamber for desorption.
In one aspect of the invention, the soil breaking assembly includes a truss connection member horizontally between the desorption chambers, a rigid support plate vertically centrally mounted on the truss connection member, and a rigid support plate at the front end of the rigid support plate. Includes soil breaking cone provided.
Illustratively, by providing a rigid support plate, the distance between the soil breaking cone and the truss connection member can be increased to ensure effective breaking of the soil.
In one aspect of the present invention, the soil breaking cone includes a front soil breaking portion provided on a rigid support plate, and a plow blade located at the lower end of the front soil breaking portion for dividing the soil into two sides.
To explain, the plow blade is provided to divide the soil broken up by the soil breaking cone to both sides of the soil breaking cone, and the soil is guided by the plow blade to allow sufficient soil to enter the desorption chambers on both sides of the plow blade. be able to.
The present invention further provides a method for remediation of equipment for remediation of cadmium contaminated soil, the method comprising the steps of:
S1, connecting the mobile vehicle Connect the hydraulic control device to the mobile vehicle, transport the remediation device to the soil site to be remedied by the mobile vehicle, let the remediation device penetrate the soil to a depth of 10-15 cm by the hydraulic control device, and then a remediation device driven by the mobile vehicle to advance through the soil at the remediation site, the soil breaking assembly splitting the soil into two sides and the soil entering the desorption assembly;
S2, crushing the soil by the first crushing assembly of the cadmium desorption soil desorption assembly, allowing the crushed soil to enter the desorption chamber, and then injecting the desorption agent into the soil in the desorption chamber from the desorption agent injection assembly;
wherein the desorbing agent is one of sodium nitrate solution, citric acid,
S3, combined remediation of soil S3-1, electrically remediating the soil treated in step S2 by an electrolytic assembly of the combined remediation assembly;
When the soil passes between the side card plate and the central partition plate, the electrolysis power supply energizes the cathode electrode in the first mounting groove and the anode electrode in the second mounting groove, so that the cathode electrode and the anode electrode are electrically connected. After that, a large amount of cadmium ions in the desorbed soil move toward the central partition, completing the electromigration of cadmium ions,
S3-2, complexing cadmium ions by a complexing repair assembly,
The reaction tank below the central partition collects the cadmium ion-containing soil, the second ejector injects the complexing agent into the soil in the reaction tank, the rotating shaft rotates, and the mixing stirrer mixes the soil and the complexing agent. is stirred and mixed to complex the desorbed cadmium ions with the complexing agent, and finally the complexed soil is discharged by the spiral discharger,
Here, the complexing agent is an ethylenediaminetetraacetic acid solution.

The invention has the following beneficial effects. The present invention provides a device for remediation of cadmium-contaminated soil, which combines a hydraulic control device and a mobile vehicle to enable the remediation device to remediate cadmium contamination of large-scale farmland soil on-site, which is more effective than the non-site remediation methods of the prior art. The present invention has the advantages of being convenient, efficient and easy to implement.
The present invention crushes and divides and guides the soil through the soil breaking assembly, desorbs the soil in the desorption chamber, separates the cadmium adsorbed on the soil with the desorption agent, thereby increasing the mobility of cadmium, and the lateral card plate. and the inclined installation of the central partition plate to change the electrode distance of the electrolysis assembly provided on the side card plate and the central partition plate, so that when the soil passes through the side card plate and the central partition plate, the electrode distance of the electrolysis assembly gradually increases It becomes smaller and the cadmium ion mobility improves.
The present invention rotates the soil to the center by the soil breaking turbofan of the side soil breaking device, and provides a V-shaped groove below the central partition to collect the soil below the central partition and place it in the desorption chamber. A large amount of cadmium ions can be collected in the V-shaped groove by the desorption treatment and electrical restoration of the electrolytic assembly, and the cadmium ions in the V-shaped groove can be efficiently collected by injecting the complexing agent by the second ejector. It complexes effectively and improves the treatment quality of cadmium-contaminated soil compared to the conventional technology.

1 is a structural schematic diagram of an entire embodiment 1 of the present invention; FIG. 1 is a structural schematic diagram of a soil desorption assembly of Embodiment 1 of the present invention; FIG. 1 is a structural schematic diagram of a joint repair assembly according to Embodiment 1 of the present invention; FIG. 1 is a structural schematic diagram of a rotary blade according to Embodiment 1 of the present invention; FIG. FIG. 3 is a structural schematic diagram of a lateral soil breaking device according to Embodiment 3 of the present invention; FIG. 4 is a structural schematic diagram of a soil breaking assembly according to Embodiment 4 of the present invention;

[Description of symbols]
1 Hydraulic Controller 2 Mounting Frame 3 Soil Desorption Assembly 30 Desorption Chamber 31 First Crushing Assembly 310 Rotating Ring 311 Rotating Blades 32 Desorption Agent Ejecting Assembly 320 Ejector Mounting Ring 321 First Ejector 322 First Powered Pump 4 Soil Breaking Assembly 40 Truss connecting member 41 Rigid support plate 42 Soil breaking cone 420 Front soil breaking section 421 Plow blade 5 Union remediation assembly 50 Center divider 51 Lateral card plate 52 Electrolytic assembly 53 Complexing remediation assembly 54 Lateral soil breaking device 520 First mounting groove 521 Second mounting groove 522 Electrolysis power supply 530 Reaction tank 531 Second ejector 532 Soil discharge port 533 Rotating shaft 534 Soil baffle 540 Fixed connection rack 541 Drive rotating shaft 542 Soil breaking turbo fan 543 Rotary motor

Example 1
The apparatus for rehabilitating cadmium-contaminated soil shown in FIG. including
The remediation device comprises a soil desorption assembly 3 fixedly mounted below the mounting frame 2, a soil breaking assembly 4 mounted at the front end of the soil desorption assembly 3, and a soil desorption assembly 3;
including an association repair assembly 5 provided at the posterior end of the
As shown in FIG. 2, the soil desorption assembly 3 consists of two cylindrical desorption chambers 30 provided parallel below the mounting frame 2, a first crushing assembly 31 provided at the front end of the desorption chamber 30, and a desorption including a desorption agent ejection assembly 32 provided in the chamber 31 for ejecting agents into the crushed soil;
The associated repair assembly 5 consists of a central partition 5 mounted vertically between two desorption chambers 30 .
0, two side card plates 51 respectively provided on the outer side of the desorption chamber 30;
comprising an electrolytic assembly 52 mounted on the side card plate 51 and the central divider 50, and a complexing repair assembly 53 mounted horizontally beneath the central divider 50;
The front end of the side card plate 51 is fixedly connected to the loading/unloading chamber 30, the rear end is adjacent to the central partition 50, and a fixed connection rack is provided between the rear end of the side card plate 51 and the central partition 50,
As shown in FIG. 3 , the electrolytic assembly 52 includes a plurality of sets of first mounting grooves 520 uniformly and vertically provided on the side surface of the central partition plate 50 , and a plurality of sets of uniformly and vertically provided side card plates 51 . including a second mounting groove 521, a cathode electrode provided in the first mounting groove 520, and an anode electrode provided in the second mounting groove 521,
a power source 522 electrically connected to the moving vehicle to the cathode and anode electrodes;
The complexing repair assembly 53 includes the reaction tank 5 fixedly provided below the central partition plate 50 .
30, a second ejector 531 provided at the front end of the reaction tank 530 capable of ejecting the complexing agent, a soil outlet 532 provided at the rear end of the reaction tank 530, and a mixing assembly provided within the reaction tank 530; including
The mixing assembly is located within the reaction tank 530 with the front end adjacent to the second ejector 531,
A rotating shaft 533 whose rear end is connected to the soil discharge port 532, a mixing agitator provided on the front half of the rotating shaft 533, a spiral ejector provided on the rear half of the rotating shaft 533, and driving the rotating shaft 533 Includes power motor.
The desorption agent ejection assembly 32 includes an ejector attachment ring 320 and an ejector attachment ring 32 that are provided on the inner wall of the desorption chamber 30 and whose central axis overlaps the central axis of the desorption chamber 30 .
A first ejector 321 provided uniformly at 0 and a first ejector provided between the desorption chambers 30
including a first powered pump 322 in communication with the ejector 321;
The first powered pump 322 is connected to a drug reservoir provided on the mobile vehicle.
The ejection direction of the desorbed chemical from the first ejector 321 coincides with the soil moving direction.
As shown in FIG. 4 , the first crushing assembly 31 includes a rotating ring 310 provided at the front end material inlet of the desorption chamber 30 and rotating blades 311 provided within the rotating ring 310 .
including
Rotating blades 311 can drive soil into the desorption chamber 30 .
Here, soil breaking assembly 4, rotating ring 310, first ejector 321, first power pump 322, power motor, second ejector 531, mixing stirrer, spiral ejector, electrolysis power supply 522,
The hydraulic control device 1 is a product of the prior art, and the specific product model can be selected by those skilled in the art according to their needs.

Example 2
There are the following differences from Example 1,
As shown in FIG. 5, the reaction tank 530 is a V-shaped groove, both surfaces of the V-shaped groove contacting the soil are arc surfaces,
A soil baffle 534 connected to the central partition 50 is provided at the upper end of the V-shaped groove.
comprising a lateral soil breaking device 54 mounted between two lateral card plates 51 and a central divider 50;
The side soil breaking device 54 includes a fixed connection rack 540 provided in the desorption chamber 30, a driving rotation shaft 541 provided in the fixed connection rack 540 and parallel to the side card plate 51,
A plurality of soil breaking turbofans 542 provided on the driving rotary shaft 541 and uniformly distributed along the axial direction of the driving rotary shaft 541, and a rotation provided on the fixed connection rack 540 for driving the soil breaking turbofans 542. Includes motor 543 .
Here, the rotary motor 543 and the soil breaking turbo fan 542 are both conventional products, and the specific product model can be selected by those skilled in the art according to their needs.

Example 3
There are the following differences from Example 2,
As shown in FIG. 6, the soil breaking assembly 4 includes a truss connection member 40 horizontally mounted between the desorption chambers 30, a rigid support plate 41 vertically mounted in the middle of the truss connection member 40, and a rigid support plate 41. includes a soil breaking cone 42 provided at the forward end of the .
The soil breaking cone 42 includes a front soil breaking portion 420 provided on the rigid support plate 41 and a plow blade 421 located at the lower end of the front soil breaking portion 420 for dividing the soil into two sides.

Example 4
In an area in the northwest, select a cadmium-contaminated soil plot with an area of 230 m ² , remediate the cadmium-contaminated soil plot with the device of Example 3,
Specifically includes the following steps:
S1, connecting mobile vehicle S1, connecting mobile vehicle Connect the hydraulic control device 1 to the mobile vehicle, transport the remediation device to the soil site to be remedied by the mobile vehicle, and put the remediation device into the soil by the hydraulic control device 1 to a depth of 10 cm. After entry, the remediation device is driven by the mobile vehicle to advance through the soil at the remediation site, the soil being split into two sides by the soil breaking assembly 4, and the soil entering the desorption assembly 3;
S2, the soil is crushed by the first crushing assembly 31 of the cadmium desorption soil desorption assembly 3, the crushed soil enters the desorption chamber 30, and then desorbed from the desorption agent injection assembly 32 to the soil in the desorption chamber 30; inject the drug
Here, the desorbing agent is a 0.5 mol/L sodium nitrate solution, and the amount injected into the soil is 0.
. 3 L/kg;
S3, the soil joint remediation electrolytic assembly 52 electrically remediates the soil treated in step S2;
Specifically, when the soil passes between the side card plate 51 and the central partition plate 50, the electrolysis power source 522 energizes the cathode electrode in the first mounting groove 520 and the anode electrode in the second mounting groove 521, After the electrode and the anode electrode are electrically connected, a large amount of cadmium ions in the desorbed soil move toward the central partition plate 50 to complete the electromigration of cadmium ions;
The complexing repair assembly 53 then complexes the cadmium ions,
Specifically, the reaction tank 530 below the central partition plate 50 collects the cadmium ion-containing soil, the second ejector 531 injects the complexing agent into the soil in the reaction tank 530, and the rotating shaft 533
rotates, the mixing stirrer stirs and mixes the soil and the complexing agent, complexes the cadmium ions desorbed by the complexing agent, and finally the spiral discharger discharges the complexed soil. ,
The complexing agent is specifically a 0.3 mol/L ethylenediaminetetraacetic acid solution, and the injection amount into the soil is 0.1 L/kg.

Example 5
There are the following differences from Example 4,
In step S1, the depth when the remediation device penetrates the soil is 15 cm.

Example 6
There are the following differences from Example 4,
In step S1, the depth when the remediation device penetrates the soil is 20 cm.

Example 7
There are the following differences from Example 4,
In step S2, the desorbing agent is a 0.5 mol/L citric acid solution.
Comparison of remediation effect Compare the remediation results of the cadmium-contaminated plots of Examples 4-7 and compare with the prior art (the prior art is the cadmium-contaminated soil remediation device and method disclosed in Chinese invention patent CN104226680B), and the remediation results are It is shown in Table 1.
Table 1 Cadmium removal rate when remediating cadmium-contaminated soil according to each example

As can be seen from Table 1, the remediation effect of cadmium-contaminated soil by the remediation apparatus and remediation method of the present invention is much higher than that of the prior art, and Example 5 is the best example. This is because the repair depth is optimal, and according to experiments, cadmium contamination in the soil is mainly concentrated in the range of 0 to 15 cm, and even if the repair depth is deeper than this, the repair effect does not increase much. rather, the energy consumption increases.

Claims (7)

A hydraulic control device (1), one end of which is connectable to a mobile vehicle, a mounting frame (2) provided at the other end of said hydraulic control device (1), and a repair device provided on said mounting frame (2). , including
Said remediation device comprises a soil desorption assembly (3) fixedly mounted below said mounting frame (2), a soil breaking assembly (4) mounted at the front end of said soil desorption assembly (3).
, and an associated remediation assembly (5) provided at the rear end of said soil desorption assembly (3);
Said soil desorption assembly (3) comprises 2 parallel mounted below said mounting frame (2).
two cylindrical desorption chambers (30), a first crushing assembly (31) provided at the front end of said desorption chamber (30), and a desorption agent provided in said desorption chamber (31) for spraying the agent onto crushed soil. including an ejection assembly (32);
Said union repair assembly (5) comprises a central partition plate (50) installed vertically between two desorption chambers (30), two lateral card plates (51) respectively installed on the outer surface of said desorption chamber (30). ), the side card plate (51) and the central partition plate (50)
and a complexing repair assembly (53) horizontally mounted beneath said central divider (50);
the front end of the lateral card plate (51) is fixedly connected to the desorption chamber (30);
The rear end is close to the central partition (50), and a fixed connection rack is provided between the rear end of the side card plate (51) and the central partition (50),
The electrolysis assembly (52) includes a plurality of sets of first mounting grooves (520) uniformly and vertically provided on the side surface of the central partition plate (50), and a plurality of sets of grooves vertically provided on the side card plate (51). a set of second mounting grooves (521), a cathode electrode provided in said first mounting groove (520), and an anode electrode provided in said second mounting groove (521);
a power source (522) electrically connected to the cathode electrode and the anode electrode is provided on the moving vehicle;
The complexing and repairing assembly (53) is a reaction tank (530) fixedly installed under the central partition (50), and is installed at the front end of the reaction tank (530) to eject the complexing agent. a second ejector (531), a soil outlet (532) provided at the rear end of said reaction tank (530), and a mixing assembly provided within said reaction tank (530);
Said mixing assembly is installed in a reaction tank (530) and has a second ejector (531) at its front end.
), the rear end of which is connected to the soil discharge port (532), the rotating shaft (533), the rotating shaft (
533), including a mixing agitator provided in the front half of said rotating shaft (533), a spiral ejector provided in the rear half of said rotating shaft (533), and a power motor driving the rotating shaft (533),
A device for remediating cadmium-contaminated soil, characterized by: The reaction tank (530) is a V-shaped groove, both surfaces of the V-shaped groove contacting the soil are arc surfaces,
2. Apparatus according to claim 1, characterized in that the upper end of said V-shaped groove is provided with a soil baffle (534) connected to a central partition (50). comprising a lateral soil breaking device (54) mounted between two said lateral card plates (51) and a central divider (50);
Said lateral soil breaking device (54) comprises: a fixed connection rack (540) installed in the desorption chamber (30), a drive rotary shaft installed in said fixed connection rack (540) parallel to the lateral card plate (51); (541), a drive rotation shaft (
a plurality of soil breaking turbofans (542) evenly distributed along the axial direction of the soil breaking turbofans (541) and a rotary motor (543) provided on said fixed connection rack (540) for driving the soil breaking turbofans (542). ). Said desorption drug ejection assembly (32) comprises an ejector mounting ring (320) which is provided on the inner wall of said desorption chamber (30) and whose central axis overlaps the central axis of said desorption chamber (30).
), a first ejector (321) evenly provided on said ejector mounting ring (320), and a first power pump provided between the desorption chambers (30) and communicating with said first ejector (321). (322) including
2. The apparatus of claim 1, wherein said first powered pump (322) is connected to a drug reservoir provided on a mobile vehicle. said first crushing assembly (31) comprising a rotating ring (310) provided at the front end material inlet of the desorption chamber (30) and rotating blades (311) provided within said rotating ring (310);
2. Apparatus according to claim 1, characterized in that the rotating blades (311) are capable of driving soil into the desorption chamber (30). Said soil breaking assembly (4) comprises a truss connection member (40) horizontally mounted between desorption chambers (30), a rigid support plate (40) vertically mounted in the middle of said truss connection member (40).
41) and a soil breaking cone (42) provided at the front end of said rigid support plate (41). A method for remediating cadmium-contaminated soil using the device according to any one of claims 1 to 6 ,
S1, connecting the mobile vehicle Connect the hydraulic control device (1) to the mobile vehicle, transport the repair device to the soil site to be repaired by the mobile vehicle, and the hydraulic control device (1) move the repair device to the soil to a depth of 10-15 cm. after entering the remediation assembly (3), driving the remediation device by the mobile vehicle to advance through the soil at the remediation site, splitting the soil into two sides by the soil breaking assembly (4) and entering the soil into the desorption assembly (3); ,
S2, cadmium desorption The soil is crushed by the first crushing assembly (31) of the soil desorption assembly (3), and after the crushed soil enters the desorption chamber (30), the desorption agent ejection assembly (32)
) into the soil in the desorption chamber (30),
wherein the desorption agent is one of sodium nitrate solution, citric acid;
S3, associated remediation of soil S3-1, electrically remediating the soil treated in step S2 by the electrolysis assembly (52) of the associated remediation assembly (5);
When the soil passes between the side card plate (51) and the central partition (50), the electrolysis power source (522) is connected to the cathode electrode in the first mounting groove (520) and the anode electrode in the second mounting groove (521). After the cathode electrode and the anode electrode are electrically connected, a large amount of cadmium ions in the desorbed soil move toward the central partition plate (50), completing electromigration of cadmium ions,
S3-2, complexing cadmium ions by a complexing repair assembly (53),
The reaction tank (530) below the central partition plate (50) collects the cadmium ion-containing soil, the second ejector (531) injects a complexing agent into the soil in the reaction tank (530), and rotates the rotating shaft (
533) rotates, the mixing stirrer stirs and mixes the soil and the complexing agent, complexes the cadmium ions desorbed by the complexing agent, and finally the soil that has been complexed by the spiral discharger. discharging; and
the complexing agent is an ethylenediaminetetraacetic acid solution;
A method characterized by:

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