A device for remediation of heavy metal contaminated soil

Abstract

The utility model relates to the field of contaminated soil remediation technology, and disclose a kind of flat type heavy metal contaminated soil remediation device, including flat type advancing component, soil recycling component, electrode repair component, feeding component and leaching solution recycling component.The contaminated soil is poured into filter screen to carry out first rough filtration into soil conveying pipeline, under the action of helical conveying blade, soil is conveyed to electrode repair component, and in the conveying process, leaching solution is poured into leaching solution at inlet, soil is cleaned once, and the leaching solution after cleaning is guided to leaching solution storage tank along with the inclined soil conveying pipeline, leaching solution is recycled by recycling tank, then the rotating door at the top of shell is opened, soil enters shell, anode and cathode cover contaminated area, soil washed by leaching solution is cleaned twice by electrodeposition method, then soil recycling tank in soil recycling component recycles soil after secondary cleaning, and is conveyed by screw rod mechanism.

Description

Technical Field

[0001] This utility model relates to the field of contaminated soil remediation technology, specifically a tank-type heavy metal contaminated soil remediation device. Background Technology

[0002] Northeast my country is an important grain production base and a region rich in mineral resources. Long-term mining and smelting activities have generated large amounts of heavy metal waste, such as tailings and slag. If not properly handled during storage and disposal, this waste can easily enter the soil through rainwater runoff and wind dispersion, causing heavy metal pollution. Soil heavy metal pollution directly affects the quality and safety of agricultural products. Heavy metal pollution is characterized by its insidious nature, long duration, and difficulty in remediation. Once it enters the soil environment, it will accumulate over a long period and may enter the human body through the food chain, posing a potential threat to human health.

[0003] To improve the efficiency of treating heavy metal pollution in soil, a comprehensive analysis and research of relevant soil remediation technologies is necessary. The patent document CN110052490B, entitled "A Circulating Chemical Leaching Soil Remediation System and Remediation Method Thereof," points out that the main remediation technologies for heavy metal-contaminated soil include physical remediation methods, chemical leaching, and phytoremediation.

[0004] Existing remediation technologies have certain limitations. For example, chemical remediation methods are prone to secondary pollution, which not only affects soil stability but also results in some devices having only a single filtration or leaching function, failing to achieve comprehensive soil remediation. Some devices are poorly designed for resource recovery, leading to significant waste of resources such as leaching solutions. Furthermore, some devices have deficiencies in the coordinated operation of their components, affecting overall remediation efficiency and quality. Therefore, those skilled in the art have provided a tank-type heavy metal contaminated soil remediation device to address the problems mentioned in the background section. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a tank-type heavy metal contaminated soil remediation device. This addresses the limitations of current remediation technologies, such as the tendency for chemical remediation to cause secondary pollution, potentially altering soil pH and affecting soil stability. Furthermore, some devices only offer single filtration or leaching functions, failing to achieve comprehensive soil remediation. Additionally, some devices suffer from poor resource recovery designs, leading to significant waste of resources like leaching solutions. Finally, some devices exhibit deficiencies in component coordination, impacting overall remediation efficiency and quality.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a tank-type heavy metal contaminated soil remediation device, comprising a tank-type traveling component, a soil recovery component, an electrode remediation component, a feeding component, and a leachate recovery component. The soil recovery component is installed on the upper part of the tank-type traveling component, the electrode remediation component is positioned above the soil recovery component, the feeding component is positioned on the upper side of the electrode remediation component, and the leachate recovery component is positioned on one side of the electrode remediation component. The soil recovery component includes a first fixing plate and a screw mechanism. The screw mechanism is installed on the upper side of the first fixing plate, and a support plate is mounted on the screw mechanism. A soil recovery trough is mounted on the support plate. The electrode remediation component includes a shell, and a collection trough is provided inside the shell. A partition plate is vertically installed inside the collection trough, and a partition plate is provided on one side of the partition plate. The device has an anode and a cathode on the other side of the isolation plate. A power supply is installed on the upper part of the outer shell. Rotary doors are installed on the upper and lower parts of the outer shell, and a rotary motor is installed on one side of each rotating door. The feeding component includes a soil conveying pipe with a leachate inlet. A spiral conveying blade is installed inside the soil conveying pipe. A leachate recovery port is installed on the lower side of the end of the soil conveying pipe away from the spiral conveying blade. A filter screen is installed at the upper opening of the leachate recovery port. The leachate recovery component includes a second fixing plate and a leachate storage tank. The leachate storage tank is installed on the second fixing plate. A leachate recovery inlet is installed on the upper part of the leachate storage tank. A recovery tank is installed on one side of the leachate storage tank. A recovery tank inlet valve is connected to one side of the recovery tank, and a recovery tank outlet valve is connected to the other side of the recovery tank.

[0009] Preferably, the tank-type traveling component is in the shape of a tank chain, which can adapt to various complex traveling environments and has strong terrain adaptability.

[0010] Preferably, the output end of the rotary motor is connected to a rotating plate, and the rotary motor is connected to the rotating door drive through the rotating plate, so that the rotary motor drives the rotating door to flip and achieve the opening and closing effect.

[0011] Preferably, the soil recycling tank is aligned with the rotating door on the bottom side of the housing, and the bottom side of the soil conveying pipe near the spiral conveying blade is aligned with the rotating door on the top of the housing.

[0012] Preferably, the upper side of the rinsing fluid storage tank has a rinsing fluid recovery inlet connected to the rinsing fluid recovery outlet. The recovery tank is connected to the rinsing fluid storage tank through a recovery tank inlet valve. When the soil after the first cleaning is about to be transported to the electrode repair component, the upper rotating door opens and the soil enters the outer shell. After the soil is cleaned a second time by the electrodeposition method, the lower rotating door opens and the soil falls into the soil recovery tank.

[0013] Preferably, the portion of the soil conveying pipe that encloses the spiral conveying blades is inclined, which can guide the leaching liquid during the first soil cleaning, so that the used leaching liquid can be guided along the inclined soil conveying pipe to the leaching liquid storage tank connected to it.

[0014] Preferably, a rotating shaft is connected to one side of the filter screen.

[0015] Preferably, an observation window is provided on the front side wall of the eluent storage tank to facilitate observation of the liquid inside the eluent storage tank.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a tank-type heavy metal contaminated soil remediation device, which has the following beneficial effects:

[0018] The tank-type heavy metal contaminated soil remediation device in this utility model consists of a tank-type traveling component, a soil recovery component, an electrode repair component, a feeding component, and a leachate recovery component. The contaminated soil is poured into a filter screen for initial coarse filtration before entering the soil conveying pipe. Under the action of the spiral conveyor blades, the soil is transported to the electrode repair component. During this transport process, leachate is poured into the leachate inlet to clean the soil. The cleaned leachate is then guided through the inclined soil conveying pipe to the leachate storage tank. The leachate is recovered through the recovery tank. Subsequently, the rotating door on the top of the outer casing opens, allowing the soil to enter the casing, where the anode and cathode... Covering the contaminated area, the soil, after being washed with leaching solution, undergoes a secondary cleaning via electrodeposition. Subsequently, the soil recovery tank within the soil recovery unit recovers the soil after the secondary cleaning and transports it via a screw mechanism. In this equipment, through the precise coordinated work of various components such as the tank-type traveling component, soil recovery component, electrode repair component, feeding component, and leaching solution recovery component, the entire process of contaminated soil treatment—from coarse filtration, primary leaching cleaning, secondary cleaning via electrodeposition, to final recovery and transportation—is achieved with high efficiency. This not only significantly improves the quality and efficiency of soil remediation but also effectively recycles and utilizes leaching solution, reducing resource waste and lowering remediation costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a tank-type heavy metal contaminated soil remediation device provided in an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the soil recovery component in a tank-type heavy metal contaminated soil remediation device provided in this application embodiment.

[0021] Figure 3 This is a structural cross-sectional view of the electrode repair component in a tank-type heavy metal contaminated soil remediation device provided in this application embodiment.

[0022] Figure 4 This is a schematic diagram of the feeding component in a tank-type heavy metal contaminated soil remediation device provided in this application embodiment.

[0023] Figure 5 This is a schematic diagram of the leachate recovery component in a tank-type heavy metal contaminated soil remediation device provided in this application embodiment.

[0024] In the diagram: 1. Tank-type traveling component; 2. Soil recovery component; 3. Electrode repair component; 4. Feeding component; 5. Leachate recovery component; 201. First fixed plate; 202. Screw mechanism; 203. Support plate; 204. Soil recovery tank; 301. Outer shell; 302. Rotary motor; 303. Rotating plate; 304. Rotating door; 305. Anode; 306. Isolation plate; 307. Collection tank; 308. Cathode; 309. Power supply; 401. Soil conveying pipe; 402. Leachate inlet; 403. Spiral conveyor blade; 404. Rotating shaft; 405. Filter screen; 406. Leachate recovery port; 501. Second fixed plate; 502. Leachate storage tank; 503. Leachate recovery inlet; 504. Recovery tank inlet valve; 505. Recovery tank; 506. Recovery tank outlet valve; 507. Observation window. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution: a tank-type heavy metal contaminated soil remediation device. (Please refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The device includes a tank-type traveling component 1, a soil recovery component 2, an electrode repair component 3, a feeding component 4, and a leachate recovery component 5. The soil recovery component 2 is installed on the upper part of the tank-type traveling component 1. The tank-type traveling component 1 is tank-like and chain-like, which can adapt to various complex traveling environments and has strong terrain adaptability. The electrode repair component 3 is located above the soil recovery component 2, the feeding component 4 is located on the upper side of the electrode repair component 3, and the leachate recovery component 5 is located on one side of the electrode repair component 3. The soil recovery component 2 includes a first fixing plate 201 and a screw mechanism 202. The screw mechanism 202 is installed on the upper side of the first fixing plate 201. A support plate 203 is installed on the screw mechanism 202, and a soil recovery trough 204 is installed on the support plate 203. The electrode repair component 3 includes a housing 301. A collection trough 307 is provided inside the housing 301. An isolation plate 306 is vertically installed inside the collection trough 307. An anode 305 is provided on one side of the isolation plate 306, and an electrode repair trough 305 is provided on the other side of the isolation plate 306. The cathode 308 and the upper part of the outer casing 301 are equipped with a power supply 309. Rotary doors 304 are located on the upper and lower sides of the outer casing 301. A rotary motor 302 is located on one side of each rotary door 304. The feeding component 4 includes a soil conveying pipe 401. A leaching liquid inlet 402 is provided on the soil conveying pipe 401. A spiral conveying blade 403 is installed inside the soil conveying pipe 401. A leaching liquid recovery port 406 is located on the lower side of the end of the soil conveying pipe 401 away from the spiral conveying blade 403. (The last sentence appears to be incomplete and possibly refers to leaching.) A filter screen 405 is provided at the upper opening of the liquid recovery port 406. The rinsing liquid recovery component 5 includes a second fixing plate 501 and a rinsing liquid storage tank 502. The rinsing liquid storage tank 502 is installed on the second fixing plate 501. A rinsing liquid recovery inlet 503 is opened at the upper part of the rinsing liquid storage tank 502. A recovery tank 505 is provided on one side of the rinsing liquid storage tank 502. A recovery tank inlet valve 504 is connected to one side of the recovery tank 505. A recovery tank outlet valve 506 is connected to the other side of the recovery tank 505.

[0027] Please see Figure 2 , Figure 3 , Figure 4 , Figure 5The output end of the rotary motor 302 is connected to a rotating plate 303. The rotary motor 302 is driven by the rotating plate 303 to drive the rotating door 304 to rotate, thus achieving the opening and closing effect. The soil recovery tank 204 is aligned with the rotating door 304 on the bottom side of the outer casing 301. The bottom side of one end of the soil conveying pipe 401 near the spiral conveying blade 403 is aligned with the rotating door 304 on the top of the outer casing 301. The leachate recovery inlet 503 on the upper side of the leachate storage tank 502 is connected to the leachate recovery port 406. The recovery tank 505 is connected to the leachate storage tank 502 through the recovery tank inlet valve 504. The soil that has been cleaned for the first time is about to be transported to the electric... When the upper rotating door 304 is opened during the repair of component 3, the soil enters the outer shell 301. After the soil is cleaned a second time by the electrodeposition method, the lower rotating door 304 opens and the soil falls into the soil recovery tank 204. The part of the soil conveying pipe 401 that wraps around the spiral conveying blade 403 is inclined, which can guide the leaching liquid during the first soil cleaning. The used leaching liquid can be guided by the inclined soil conveying pipe 401 to the leaching liquid storage tank 502 connected to it. A rotating shaft 404 is connected to one side of the filter screen 405. An observation window 507 is opened on the front side wall of the leaching liquid storage tank 502, which facilitates the observation of the liquid inside the leaching liquid storage tank 502.

[0028] The tank-type heavy metal contaminated soil remediation device in this utility model consists of a tank-type traveling component 1, a soil recovery component 2, an electrode repair component 3, a feeding component 4, and a leaching solution recovery component 5.

[0029] The tank-type traveling component 1 is tank-like and chain-like, adaptable to various complex traveling environments. The feeding component 4 includes a soil conveying pipe 401, a leaching liquid inlet 402, a spiral conveyor blade 403, a rotating shaft 404, a filter screen 405, and a leaching liquid recovery port 406. The contaminated soil is manually poured into the filter screen 405 for initial coarse filtration before entering the soil conveying pipe 401. Under the action of the spiral conveyor blade 403, the soil is conveyed to the electrode repair component 3. During the conveying process, leaching liquid is poured into the leaching liquid inlet 402. This component conveys the contaminated soil to the electrode repair component 3 through the pipe, injecting leaching liquid during the conveying process to clean the soil.

[0030] The electrode remediation component 3 includes an anode 305, a cathode 308, an electrode liquid collection tank 307, and an upper and lower rotating door 304. When the soil that has undergone the first cleaning is about to be transported to this component, the upper rotating door 304 opens, and the soil enters the electrode remediation tank. Both the anode 305 and the cathode 308 cover the contaminated area, spaced 20-50 cm apart. The anode 305 solution in the electrode liquid collection tank 307 is enriched with cationic pollutants (such as Pb2+), and the cathode 308 solution is enriched with anionic pollutants (such as CrO42-). Charged pollutant ions (such as heavy metals Cd2+, Pb2+, etc.) are also present.2 Under the influence of a DC electric field, ions (+ or anions CrO42-) move directionally towards the opposite electrode. Soil particles, carrying a negative charge, adsorb cations under the electric field, forming an electrical double layer. This propels pore water towards the cathode 308, causing dissolved pollutants to migrate. The cathode 308 and collection tank 307 are used for precipitation and electrodeposition (e.g., Cu2++2e-). - →Cu↓) or ion exchange resin capture; Anode 305 collection tank 307: Anions are treated by adsorption or chemical precipitation;

[0031] The recovery components include a soil recovery component 2 and a leachate recovery component 5. The soil recovery component 2 includes a screw mechanism 202, a support plate 203, and a soil recovery tank 204. After the soil is cleaned twice by the electrodeposition method, the lower rotating door 304 opens, and the soil falls into the soil recovery tank 204. It is then transported to the end of the device by the screw mechanism 202. The leachate recovery component 5 includes a leachate storage tank 502, a leachate recovery inlet 503, a recovery tank inlet valve 504, a recovery tank 505, a recovery tank outlet valve 506, and an observation window 507. The leachate that flows out during the first soil cleaning process enters the leachate storage tank 502 through the leachate recovery inlet 503. The recovery tank inlet valve 504 opens, and the leachate enters the recovery tank 505. The recovery tank outlet valve 506 opens, and the leachate flows out of the recovery tank 505. The mixed liquid discharged from the leaching unit flows into the recovery tank 505 through pipes or gravity. The recovery tank 505 is equipped with a filter screen 405, which rapidly separates large soil particles from the contaminated liquid through gravity sedimentation. The treated water undergoes multi-layer filtration (sand filtration, membrane filtration) to remove residual particles and contaminants. The purified water is then pumped back into the leaching unit for recycling, reducing water consumption. The recovery tank 505 is linked to a PLC control system, automatically adjusting flow rate, dosage, and separation parameters. By monitoring the contaminant concentration and leaching effect in the soil in real time, the remediation strategy can be adjusted promptly to improve remediation efficiency and quality. The system can automatically adjust the flow rate, concentration, and electric field intensity of the leaching solution according to the degree of soil contamination and remediation goals, achieving precise control.

[0032] This device combines dynamic rinsing technology with electric coupling technology to achieve efficient rinsing and electro-migration in the soil remediation process, improving remediation efficiency. By optimizing the flow pattern of the rinsing fluid and the distribution of the electric field, it achieves precise removal of pollutants from the soil, reducing resource waste and environmental pollution. The system adopts a modular design, which is convenient for assembly, disassembly and transportation, improving the system's flexibility and portability. The modular design also facilitates system maintenance and upgrades, reducing maintenance costs and cycles. Furthermore, by mounting the entire system on a tracked vehicle, it has strong terrain adaptability and expands its applicable range.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] In this document, unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for remediating heavy metal contaminated soil in a tank, comprising a tank traveling part (1), a soil recycling part (2), an electrode remediation part (3), a feeding part (4), and a leaching solution recycling part (5), wherein the soil recycling part (2) is installed on the upper part of the tank traveling part (1), the electrode remediation part (3) is disposed above the soil recycling part (2), the feeding part (4) is disposed on the upper side of the electrode remediation part (3), and the leaching solution recycling part (5) is disposed on one side of the electrode remediation part (3). The soil recycling component (2) includes a first fixing plate (201) and a screw mechanism (202). The screw mechanism (202) is installed on the upper side of the first fixing plate (201). A support plate (203) is installed on the screw mechanism (202), and a soil recycling trough (204) is installed on the support plate (203). The electrode repair component (3) includes a housing (301), a collection groove (307) is provided inside the housing (301), an isolation plate (306) is vertically installed inside the collection groove (307), an anode (305) is provided on one side of the isolation plate (306), a cathode (308) is provided on the other side of the isolation plate (306), a power supply (309) is installed on the upper part of the housing (301), a rotating door (304) is provided on the upper and lower side walls of the housing (301), and a rotating motor (302) is provided on one side of the rotating door (304). The feeding component (4) includes a soil conveying pipe (401), a leaching liquid inlet (402) is provided on the soil conveying pipe (401), a spiral conveying blade (403) is provided inside the soil conveying pipe (401), a leaching liquid recovery port (406) is provided on the lower side of the end of the soil conveying pipe (401) away from the spiral conveying blade (403), and a filter screen (405) is provided at the upper opening of the leaching liquid recovery port (406); The rinsing fluid recovery component (5) includes a second fixing plate (501) and a rinsing fluid storage tank (502). The rinsing fluid storage tank (502) is installed on the second fixing plate (501). A rinsing fluid recovery inlet (503) is provided on the upper part of the rinsing fluid storage tank (502). A recovery tank (505) is provided on one side of the rinsing fluid storage tank (502). A recovery tank inlet valve (504) is connected to one side of the recovery tank (505), and a recovery tank outlet valve (506) is connected to the other side of the recovery tank (505).

2. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The tank-type traveling component (1) is in the shape of a tank chain.

3. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The soil recycling tank (204) is aligned with the revolving door (304) on the bottom side of the outer casing (301).

4. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The output end of the rotary motor (302) is connected to a rotating plate (303), and the rotary motor (302) is driven to the rotating door (304) through the rotating plate (303).

5. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The bottom side of one end of the soil conveying pipe (401) adjacent to the spiral conveying blade (403) is aligned with the rotating door (304) on the top of the housing (301).

6. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: A rotating shaft (404) is connected to one side of the filter screen (405).

7. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The portion of the soil conveying pipe (401) that encloses the spiral conveying blade (403) is inclined.

8. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: The rinsing fluid storage tank (502) has a rinsing fluid recovery inlet (503) on its upper side connected to the rinsing fluid recovery port (406), and the recovery tank (505) is connected to the rinsing fluid storage tank (502) through the recovery tank inlet valve (504).

9. The apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein: An observation window (507) is provided on the front side wall of the rinsing fluid storage tank (502).

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