Mobile treatment equipment for electrokinetic remediation of heavy metal contaminated soil

Abstract

The invention discloses mobile treatment equipment for electrokinetic remediation of heavy metal contaminated soil. The mobile treatment equipment comprises a mobile carrier and an electrokinetic remediation mechanism arranged on the mobile carrier. The moving carrier comprises a supporting chassis, and a plurality of crawler-type driving wheel sets are installed at the bottom of the supporting chassis. The electric repairing mechanism comprises an outer barrel shell which is arranged at the top of the supporting chassis and is horizontally placed, an inner barrel shell which is coaxial with the outer barrel shell is arranged in the outer barrel shell, and an annular channel is formed between the inner side wall of the outer barrel shell and the outer side wall of the inner barrel shell; a plurality of heavy metal concentration sensors are distributed on the inner side wall of the annular channel; the equipment disclosed by the invention has efficient remediation performance, can generate a stable and high-strength electric field, improves the distribution uniformity of the electric field in soil, and ensures that heavy metals in a remediation area can be effectively migrated.

Description

Technical Field

[0001] The present invention relates to the technical field of soil regeneration, and in particular to a mobile treatment device for electrically repairing heavy metal contaminated soil. Background Art

[0002] Soil is a resource that human society depends on for survival. However, with the development of industry and agriculture, soil has been contaminated by heavy metals to varying degrees. At the same time, soluble heavy metals in the soil can migrate to groundwater, pollute groundwater resources, and threaten human survival and health. Therefore, how to treat heavy metal-contaminated soil has become a research hotspot.

[0003] At present, there are three main technologies for remediation of heavy metal contaminated soil: (1) Removing heavy metals from contaminated soil, including soil leaching technology, plant remediation technology, thermal desorption technology, etc.; (2) Fixing heavy metals in soil, mainly including solidification stabilization technology, vitrification technology, etc.; (3) Isolating heavy metal contaminated soil from the outside world, mainly including imported soil method, barrier landfill technology, etc. However, the remediation equipment of existing technologies generally has the problems of low remediation efficiency and incomplete remediation, which needs further improvement and optimization. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile treatment device for electrically repairing heavy metal contaminated soil, which can efficiently remove various heavy metal pollutants in the contaminated soil.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A mobile treatment device for electrically repairing heavy metal contaminated soil, comprising a mobile carrier and an electric repair mechanism arranged on the mobile carrier;

[0007] The mobile vehicle comprises a supporting chassis, and a plurality of sets of tracked driving wheels are installed at the bottom of the supporting chassis;

[0008] The electric repair mechanism comprises an outer cylinder shell arranged on the top of the supporting chassis and placed horizontally, an inner cylinder shell arranged coaxially therewith is arranged inside the outer cylinder shell, and an annular channel is formed between the inner side wall of the outer cylinder shell and the outer side wall of the inner cylinder shell;

[0009] A plurality of heavy metal concentration sensors are arranged on the inner wall of the annular channel;

[0010] An annular and hollow first containing shell is arranged outside the outer cylindrical shell, and a plurality of first electrode plates extending in a direction parallel to the axis of the outer cylindrical shell are arranged inside the first containing shell;

[0011] An annular and hollow second containing shell is arranged inside the inner cylindrical shell, and a plurality of second electrode plates extending parallel to the axis of the inner cylindrical shell are arranged inside the second containing shell;

[0012] A plurality of material input pipes extending in the radial direction and connected to the annular channel are arranged on the outer side of the outer cylinder shell;

[0013] A plurality of first ion filter membranes communicating with the interior of the first containing shell are arranged on the side wall of the outer cylindrical shell;

[0014] A plurality of second ion filter membranes communicating with the interior of the second containing shell are arranged on the side wall of the inner cylindrical shell.

[0015] Preferably, the side wall of the outer cylinder shell has a plurality of first through grooves which penetrate in the radial direction and are connected to the interior of the first accommodating shell, two first support plates are arranged in each first through groove, and a first ion filter membrane is arranged between the two first support plates in each first through groove;

[0016] The first support plate has a plurality of first micro holes extending radially through the outer cylinder shell;

[0017] The inner cylindrical shell side wall is provided with a plurality of second through grooves which penetrate in the radial direction and are connected with the interior of the second containing shell, each second through groove is provided with two second support plates, and a second ion filter membrane is provided between the two second support plates in each second through groove;

[0018] The second support plate is provided with a plurality of second micro holes which penetrate radially through the inner cylindrical shell.

[0019] Note: According to the pollution type of heavy metal contaminated soil, the types of the first ion filter membrane and the second ion filter membrane are flexibly selected to obtain better remediation effect and higher remediation efficiency.

[0020] Preferably, a plurality of first partition plates extending along the radial plane of the outer cylinder shell are provided in the first accommodating shell, and the first partition plates divide the interior of the first accommodating shell into a plurality of independent first partition chambers;

[0021] Each first separated chamber has at least one first electrode plate;

[0022] The first containing shell is provided with a first electrolyte input pipe and a first electrolyte output pipe which are connected with the first separation chamber;

[0023] A plurality of second partition plates extending along the radial plane of the inner cylindrical shell are arranged in the second containing shell, and the second partition plates divide the interior of the second containing shell into a plurality of independent second partition chambers;

[0024] Each second partition chamber has at least one second electrode plate;

[0025] The second containing shell is provided with a second electrolyte input pipe and a second electrolyte output pipe which are communicated with the second separation chamber.

[0026] Description: Multiple first separation chambers and multiple second separation chambers facilitate more precise zoning control of heavy metal contaminated soil. The concentration of heavy metal ions in the heavy metal contaminated soil is monitored in real time through multiple heavy metal concentration sensors. According to the concentration distribution of heavy metal ions, the power supply parameters of each power supply are flexibly adjusted, thereby adjusting the electric field strength between each group of first electrode plates and second electrode plates.

[0027] Preferably, a propulsion mechanism for continuously propulsing the material is provided at the input end of the annular channel, and the propulsion mechanism comprises a plurality of fan rings slidably connected in the annular channel, and the plurality of fan rings together form an annular structure coaxial with the outer cylinder shell;

[0028] The fan ring slides in a direction parallel to the axis of the outer cylinder shell;

[0029] The input end of the outer cylinder shell has a plurality of connecting holes that are parallel to the axis thereof and penetrate therethrough, and connecting rods are slidably connected in the connecting holes, and a plurality of fan rings are fixedly connected to each connecting rod in a one-to-one correspondence;

[0030] The end of the outer cylinder shell is provided with a plurality of accommodating cylinders extending parallel to its axis, and a plurality of connecting rods extend into each accommodating cylinder in a one-to-one correspondence manner. A telescopic rod for driving the connecting rod to move is provided in the accommodating cylinder.

[0031] Description: The heavy metal contaminated soil input into the annular channel is continuously pushed from the input end to the output end using a propulsion mechanism.

[0032] Preferably, a material output mechanism is provided at the output end of the annular channel, the material output mechanism comprises a first constraint ring provided at the output end of the outer cylinder shell and arranged coaxially therewith, a second constraint ring coaxially arranged with the first constraint ring is provided at the output end of the outer cylinder shell, a first material output channel is formed between the inner side of the second constraint ring and the outer side of the first constraint ring, and the first material output channel is communicated with the output end of the annular channel;

[0033] A first material receiving box with an upward opening is arranged on the top of the supporting chassis and below the first material output channel.

[0034] Note: Finally, the heavy metal contaminated soil after electric repair is discharged through the first material output channel and falls into the first material receiving box for temporary storage.

[0035] Preferably, a third constraint ring coaxially arranged with the second constraint ring is provided at the output end of the outer cylinder shell, and a second material output channel is formed between the inner side of the third constraint ring and the outer side of the second constraint ring;

[0036] A second material receiving box with an upward opening is arranged on the top of the supporting chassis and below the second material output channel.

[0037] Note: There may still be some heavy metal ions remaining in the soil near the edge of the annular channel. This part will be discharged separately through the second material output channel and transported to the annular channel for further treatment, which is conducive to more thorough removal of heavy metal pollutants in the soil.

[0038] Preferably, a material infiltration mechanism is provided in the annular channel, and the material infiltration mechanism comprises a plurality of material infiltration plates provided in the annular channel and arranged along the radial plane of the outer cylinder shell, the interior of the material infiltration plate is a hollow structure, and the side of the material infiltration plate has a plurality of output holes connected to the interior thereof;

[0039] An annular and hollow conveying shell is arranged outside the outer cylinder shell, and the interior of the conveying shell is connected with the interior of the material infiltration plate through a through hole arranged on the side wall of the outer cylinder shell;

[0040] A conveying pipe communicating with the inside of the conveying shell is arranged on the outside of the conveying shell.

[0041] Note: By using a material infiltration mechanism to input a buffer solution into the ceramsite-heavy metal contaminated soil mixture, the pH of the solution can be maintained stable within a certain range, avoiding drastic changes in soil pH during the electrokinetic remediation process.

[0042] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0043] 1. The present invention has a reasonable structural design, high-efficiency repair performance, can generate a stable and high-intensity electric field, and improve the uniformity of the electric field distribution in the soil, ensuring that heavy metals in the repair area can be effectively migrated;

[0044] 2. The present invention optimizes the mass transfer process. By injecting an appropriate amount of electrolyte into the soil, the conductivity of the soil is improved, which can accelerate the migration speed of heavy metal ions in the soil. At the same time, during the treatment process, the ceramsite is evenly mixed with the powdered heavy metal contaminated soil to form a ceramsite-heavy metal contaminated soil mixture, which increases the porosity of the soil and provides more channels for the migration of heavy metal ions.

[0045] 3. The present invention has the capability of rapid deployment and the design of mobility, which improves the emergency response capability of the equipment. After the equipment arrives at the remediation site, it can complete installation, debugging and trial operation in a short time and quickly put into soil remediation operations;

[0046] 4. The present invention has good adaptability. The physical and chemical properties of soil vary greatly due to factors such as region and geological conditions. The equipment of the present invention can flexibly adjust the repair parameters according to the characteristics of different soil types to ensure the stability and effectiveness of the repair process;

[0047] 5. The present invention has good ability to treat pollution from multiple heavy metals and has the ability to synergistically repair multiple heavy metals. It can also dynamically adjust the repair parameters by real-time monitoring of the concentration changes of multiple heavy metals in the soil to ensure the pertinence and effectiveness of the repair process. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a front view of the present invention;

[0049] Figure 2 It is a left side view of the electric repair mechanism of the present invention;

[0050] Figure 3 is a left side view of the first support plate of the present invention;

[0051] Figure 4 is a left side view of the second support plate of the present invention;

[0052] Figure 5 It is a structural schematic diagram of the propulsion mechanism of the present invention;

[0053] Figure 6 yes Figure 5 Left view of;

[0054] Figure 7 It is a structural schematic diagram of the material output mechanism of the present invention;

[0055] Figure 8 It is a structural schematic diagram of the material infiltration mechanism of the present invention;

[0056] Fig. 9 It is a left side view of the material infiltration mechanism of the present invention;

[0057] Fig.10 It is a left view of the material impregnation plate of the present invention.

[0058] In the figure, 10-mobile carrier, 11-support chassis, 12-tracked driving wheel set, 20-electric repair mechanism, 200-annular channel, 201-material input pipe, 202-heavy metal concentration sensor, 21-outer cylinder shell, 210-first through groove, 211-first support plate, 2110-first micropore, 212-first ion filter membrane, 22-inner cylinder shell, 220-second through groove, 221-second support plate, 222-second ion filter membrane, 23-first accommodating shell, 230-first electrode plate, 231-first partition plate, 2310-first partition chamber, 232-first electrolyte input pipe, 233-first electrolyte output pipe, 24-second accommodating shell, 240-second Electrode plate, 241-second partition plate, 2410-second partition chamber, 242-second electrolyte input pipe, 243-inner electrolyte output pipe, 25-propulsion mechanism, 251-fan ring, 252-connecting rod, 2520-connecting hole, 253-accommodating tube, 254-telescopic rod, 26-material output mechanism, 260-first material output channel, 261-first constraint ring, 262-second constraint ring, 263-third constraint ring, 2601-second material output channel, 264-first material receiving box, 265-second material receiving box, 30-material infiltration mechanism, 31-material infiltration plate, 311-output hole, 32-conveying shell, 320-conveying pipe, 321-through hole. DETAILED DESCRIPTION

[0059] Combine the following Figures 1 to 10 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of the respective main views or structural schematic diagrams themselves.

[0060] Example 1: A mobile treatment device for electrically repairing heavy metal contaminated soil, such as Figure 1 As shown, it includes a mobile carrier 10 and an electric repair mechanism 20 disposed on the mobile carrier 10;

[0061] The mobile vehicle 10 includes a supporting chassis 11, and a plurality of track-type driving wheel sets 12 are installed at the bottom of the supporting chassis 11;

[0062] The crawler-type driving wheel set 12 is a crawler-type driving wheel set driven by a motor in the prior art, and the suspension of the crawler-type driving wheel set 12 is fixedly connected to the bottom of the supporting chassis 11;

[0063] The entire mobile vehicle 10 is an unmanned remote control structure, which can move freely on the ground. The specific remote control principle is the existing technology;

[0064] like Figure 1As shown, the electric repair mechanism 20 includes an outer cylinder shell 21 disposed on the top of the supporting chassis 11 and placed horizontally, an inner cylinder shell 22 coaxially arranged therewith is disposed inside the outer cylinder shell 21, and an annular channel 200 is formed between the inner side wall of the outer cylinder shell 21 and the outer side wall of the inner cylinder shell 22;

[0065] like Figure 2 As shown, a plurality of heavy metal concentration sensors 202 are arranged on the inner wall of the annular channel 200;

[0066] The heavy metal concentration sensor 202 is a prior art, for example, it may be an X-ray fluorescence spectrum sensor;

[0067] like Figure 1 As shown, an annular and hollow first containing shell 23 is disposed outside the outer cylindrical shell 21, and a plurality of first electrode plates 230 extending in a direction parallel to the axis of the outer cylindrical shell 21 are disposed inside the first containing shell 23;

[0068] The first electrode plate 230 is a prior art, for example, a titanium-plated platinum electrode may be used;

[0069] An annular and hollow second containing shell 24 is disposed inside the inner cylindrical shell 22, and a plurality of second electrode plates 240 extending parallel to the axis of the inner cylindrical shell 22 are disposed inside the second containing shell 24;

[0070] The second electrode plate 240 is a conventional technology, for example, an aluminum electrode may be used;

[0071] A plurality of material input pipes 201 extending in the radial direction and communicating with the annular channel 200 are disposed on the outer side of the outer cylinder shell 21;

[0072] like Figure 3 As shown, a plurality of first ion filter membranes 212 communicating with the interior of the first containing shell 23 are arranged on the side wall of the outer cylindrical shell 21;

[0073] like Figure 4 As shown, a plurality of second ion filter membranes 222 communicating with the interior of the second containing shell 24 are arranged on the side wall of the inner cylindrical shell 22;

[0074] According to the flow direction of the heavy metal contaminated soil in the annular channel 200, the annular channel 200 is divided into an input end close to the material input pipe 201 and an output end far away from the material input pipe 201;

[0075] The outer cylinder shell 21 is also divided into an input end close to the material input pipe 201 and an output end far away from the material input pipe 201 .

[0076] like Figure 3As shown, the side wall of the outer cylindrical shell 21 has a plurality of first through grooves 210 that penetrate along the radial direction and are connected to the interior of the first accommodating shell 23, and two first support plates 211 are arranged in each first through groove 210, and a first ion filter membrane 212 is arranged between the two first support plates 211 in each first through groove 210;

[0077] The first ion filter membrane 212 is a composite membrane composed of an ultrafiltration membrane and an ion exchange membrane in the prior art, wherein the ultrafiltration membrane is an ultrafiltration membrane made of polyacrylonitrile material, and the ion exchange membrane is selected according to the actual pollution type. For mercury pollution, a sulfonated polysulfone composite membrane is selected, for cadmium pollution, a cation exchange membrane is selected, for lead pollution, an anion exchange membrane is selected, and for chromium pollution, an anion exchange membrane is selected;

[0078] The first support plate 211 has a plurality of first micro holes 2110 extending radially through the outer cylinder shell 21;

[0079] The first micropore 2110 is a micropore of 0.1 to 0.5 mm;

[0080] like Figure 4 As shown, the side wall of the inner cylindrical shell 22 has a plurality of second through grooves 220 that penetrate along the radial direction and communicate with the interior of the second accommodating shell 24, and two second support plates 221 are arranged in each second through groove 220, and a second ion filter membrane 222 is arranged between the two second support plates 221 in each second through groove 220;

[0081] The second ion filter membrane 222 is a composite membrane composed of an ultrafiltration membrane and an ion exchange membrane in the prior art, wherein the ultrafiltration membrane is an ultrafiltration membrane made of polyacrylonitrile material, and the ion exchange membrane is selected according to the actual pollution type. For mercury pollution, a sulfonated polysulfone composite membrane is selected, for cadmium pollution, a cation exchange membrane is selected, for lead pollution, an anion exchange membrane is selected, and for chromium pollution, an anion exchange membrane is selected;

[0082] The second support plate 221 has a plurality of second micro holes 2210 extending radially through the inner cylinder shell 22;

[0083] The second micropores 2210 are micropores with a diameter of 0.1 to 0.5 mm.

[0084] like Figure 2 As shown, a plurality of first partition plates 231 extending along the radial plane of the outer cylinder shell 21 are provided in the first accommodating shell 23, and the first partition plates 231 divide the interior of the first accommodating shell 23 into a plurality of independent first partition chambers 2310;

[0085] Each first partition chamber 2310 has at least one first electrode plate 230 therein;

[0086] like Figure 1As shown, the first containing shell 23 is provided with a first electrolyte input pipe 232 and a first electrolyte output pipe 233 which are connected with the first separation chamber 2310;

[0087] The second accommodating shell 24 is provided with a plurality of second partition plates 241 extending along the radial plane of the inner cylindrical shell 22. The second partition plates 241 divide the interior of the second accommodating shell 24 into a plurality of independent second partition chambers 2410.

[0088] Each second partition chamber 2410 has at least one second electrode plate 240 therein;

[0089] like Figure 1 As shown, the second containing shell 24 is provided with a second electrolyte input pipe 242 and a second electrolyte output pipe 243 which are connected with the second separation chamber 2410 .

[0090] like Figure 1 As shown, the input end of the annular channel 200 is provided with a propulsion mechanism 25 for continuously propulsing the material. Figure 5 As shown, the propulsion mechanism 25 includes a plurality of fan rings 251 slidably connected in the annular channel 200, such as Figure 6 As shown, a plurality of sector rings 251 together form an annular structure coaxial with the outer cylinder shell 21;

[0091] The sector ring 251 slides in a direction parallel to the axis of the outer cylinder shell 21;

[0092] The input end of the outer cylinder shell 21 has a plurality of connecting holes 2520 extending parallel to the axis thereof, and a connecting rod 252 is slidably connected in the connecting hole 2520. The plurality of fan rings 251 are fixedly connected to each connecting rod 252 in a one-to-one correspondence.

[0093] The end of the outer cylinder shell 21 is provided with a plurality of accommodating cylinders 253 extending parallel to the axis thereof, a plurality of connecting rods 252 correspondingly extend into each accommodating cylinder 253, and a telescopic rod 254 for driving the connecting rod 252 to move is provided in the accommodating cylinder 253;

[0094] The telescopic rod 254 is an electrically controlled telescopic rod driven by a servo motor in the prior art. The outer rod end of the telescopic rod 254 is fixedly connected to the inner end of the accommodating tube 253 , and the inner rod end of the telescopic rod 254 is fixedly connected to the connecting rod 252 .

[0095] like Figure 1 As shown, the output end of the annular channel 200 is provided with a material output mechanism 26, such as Figure 7As shown, the material output mechanism 26 includes a first constraint ring 261 provided at the output end of the outer cylinder shell 21 and arranged coaxially therewith, a second constraint ring 262 arranged coaxially with the first constraint ring 261 is provided at the output end of the outer cylinder shell 21, a first material output channel 260 is formed between the inner side of the second constraint ring 262 and the outer side of the first constraint ring 261, and the first material output channel 260 is communicated with the output end of the annular channel 200;

[0096] The first material output channel 260 is an annular channel;

[0097] A first material receiving box 264 with an opening facing upward is provided on the top of the supporting chassis 11 below the first material output channel 260 .

[0098] Embodiment 2: Based on embodiment 1, Figure 7 As shown, a third constraint ring 263 coaxially arranged with the second constraint ring 262 is provided at the output end of the outer cylinder shell 21, and a second material output channel 2601 is formed between the inner side of the third constraint ring 263 and the outer side of the second constraint ring 262;

[0099] The second material output channel 2601 is an annular channel. The second material output channel 2601 is located outside the first material output channel 260 to form a concentric ring structure.

[0100] A second material receiving box 265 with an opening facing upward is provided on the top of the supporting chassis 11 below the second material output channel 2601 .

[0101] Embodiment 3: Based on embodiment 2, Figure 1 As shown, a material infiltration mechanism 30 is provided in the annular channel 200. Figure 8 , Fig. 9 and Fig.10 As shown, the material infiltration mechanism 30 includes a plurality of material infiltration plates 31 disposed in the annular channel 200 and arranged along the radial plane of the outer cylinder shell 21. The material infiltration plates 31 are hollow in structure, and the side surfaces of the material infiltration plates 31 are provided with a plurality of output holes 311 communicating with the interior thereof.

[0102] An annular and hollow conveying shell 32 is disposed outside the outer cylinder shell 21, and the interior of the conveying shell 32 is connected to the interior of the material infiltration plate 31 through a through hole 321 disposed on the side wall of the outer cylinder shell 21;

[0103] A delivery pipe 320 communicating with the interior of the delivery shell 32 is disposed outside the delivery shell 32 .

[0104] In the actual application of the present invention, in order to facilitate understanding and distinction, the internal space of the annular channel 200 is further subdivided. From the input end to the output end, the annular channel 200 is divided into the input pushing chamber at the material input pipe 201 and the pushing mechanism 25, the infiltration chamber at the material infiltration mechanism 30, and the electric repair chamber at the first accommodating shell 23 and the second accommodating shell 24;

[0105] In the actual application process of the present invention, the heavy metal contaminated soil to be repaired is first naturally dried to remove the moisture in the heavy metal contaminated soil, so that the moisture in the heavy metal contaminated soil is reduced to less than 5%;

[0106] The heavy metal contaminated soil is then crushed to make it powdery, and ceramsite with a particle size of 5 mm ± 1 mm and the powdered heavy metal contaminated soil are uniformly mixed in a volume ratio of 1:1 to form a ceramsite-heavy metal contaminated soil mixture for standby use;

[0107] The ceramsite-heavy metal contaminated soil mixture is transported to the input push chamber in the annular channel 200 through the material input pipe 201 by using the screw conveyor of the prior art;

[0108] The ceramsite-heavy metal contaminated soil mixture input into the annular channel 200 is continuously pushed from the input end to the output end by using the propulsion mechanism 25;

[0109] The synchronous extension or retraction of the inner rods of the multiple telescopic rods 254 can drive the multiple fan rings 251 to reciprocate along the axis direction of the outer cylinder shell 21 in the annular channel 200;

[0110] The movement process of the multiple sector rings 251 from the input end to the output end is a push stroke, and the movement process of the multiple sector rings 251 from the output end to the input end is a reset stroke;

[0111] During the pushing stroke, the plurality of fan rings 251 can push the ceramsite-heavy metal contaminated soil mixture in the annular channel 200 from the input end to the output end, and during the pushing stroke, the ceramsite-heavy metal contaminated soil mixture is stopped from being transported into the annular channel 200;

[0112] During the reset stroke, the ceramsite-heavy metal contaminated soil mixture continues to be transported into the annular channel 200, and the cycle repeats in this way, so that the ceramsite-heavy metal contaminated soil mixture input into the annular channel 200 is continuously pushed from the input end to the output end;

[0113] When the ceramsite-heavy metal contaminated soil mixture passes through the infiltration chamber, a buffer solution is input into the ceramsite-heavy metal contaminated soil mixture by means of the material infiltration mechanism 30. The buffer solution is a citric acid-sodium citrate buffer solution, which can maintain the pH of the solution stable within a certain range, thereby avoiding drastic changes in the pH value of the soil during the electrokinetic remediation process. At the same time, the citrate ion can form a complex with some heavy metal ions, thereby increasing the solubility and mobility of the heavy metal ions in the solution, and thus helping to improve the remediation effect.

[0114] The buffer solution is fed into the conveying shell 32 through the conveying pipe 320 by using the conveying pump of the prior art. The buffer solution in the conveying shell 32 then enters each material infiltration plate 31 through the through hole 321. The buffer solution in the material infiltration plate 31 is finally discharged through the multiple output holes 311 and mixed in the ceramsite-heavy metal contaminated soil mixture.

[0115] The concentration of citric acid-sodium citrate buffer solution is 0.1 mol / L, and the amount added is 200 mL / kg;

[0116] The ceramsite-heavy metal contaminated soil mixture continues to move in the annular channel 200 and passes through the electric repair chamber. The first containment shell 23 and the second containment shell 24 are filled with an electrolyte solution, which is specifically a 0.1 mol / L sodium chloride solution.

[0117] Connect the first electrode plate 230 and the second electrode plate 240 to the positive and negative electrodes of an external DC power source, respectively. The external DC power source has a specification of 110V and 0.5A.

[0118] At this time, the first ion filter membrane 212 is set as an anion exchange composite membrane, and the second ion filter membrane 222 is set as a cation exchange composite membrane;

[0119] Under the action of the electric field, the heavy metal ions in the ceramsite-heavy metal contaminated soil mixture will migrate along the radial direction of the outer cylindrical shell 21, and finally pass through the first ion filter membrane 212 to enter the first containing shell 23, or pass through the second ion filter membrane 222 to enter the second containing shell 24;

[0120] Cations in ceramsite-heavy metal contaminated soil mixtures, such as lead ions Pb 2+ 、Cd 2+ 、Copper ion Cu 2+ 、Zn ion Zn 2+ Migrate toward the negative pole of the electric field, and finally pass through the second ion filter membrane 222 and enter the second containing shell 24;

[0121] Anions in ceramsite-heavy metal contaminated soil mixtures, such as chromate ions CrO4 2- 、Dichromate ion Cr2O72- 、Arsenate ion AsO4 3- 、Arsenite ion AsO3 3- Migrate toward the positive pole of the electric field, and finally pass through the first ion filter membrane 212 and enter the first containing shell 23;

[0122] The first electrode plate 230 and the second electrode plate 240 in the same radial direction of the outer cylinder shell 21 are a group, and each group of the first electrode plates 230 and the second electrode plates 240 are powered by an independent power supply. The multiple heavy metal concentration sensors 202 arranged on the inner wall of the annular channel 200 can monitor the concentration of heavy metal ions in the ceramsite-heavy metal contaminated soil mixture in real time, and flexibly adjust the power supply parameters of each power supply according to the concentration distribution of the heavy metal ions, thereby adjusting the electric field strength between each group of the first electrode plates 230 and the second electrode plates 240;

[0123] For areas with high concentrations of heavy metal ions, the electric field strength is increased, and for areas with low concentrations of heavy metal ions, the electric field strength is reduced;

[0124] Finally, the ceramsite-heavy metal contaminated soil mixture after electric repair is discharged through the first material output channel 260 and falls into the first material receiving box 264 for temporary storage;

[0125] Some heavy metal ions may still remain in the ceramsite-heavy metal contaminated soil mixture near the edge of the annular channel 200. The ceramsite-heavy metal contaminated soil mixture near the edge of the annular channel 200 is discharged separately through the second material output channel 2601, and falls into the second material receiving box 265 below for temporary storage. The ceramsite-heavy metal contaminated soil mixture in the second material receiving box 265 is re-transported to the annular channel 200 through the material input pipe 201 for further treatment, which is conducive to more thorough removal of heavy metal pollutants in the ceramsite-heavy metal contaminated soil mixture.

[0126] The repaired ceramsite-heavy metal contaminated soil mixture can be screened out with a screening machine using existing technology to obtain clean and uncontaminated soil.

Claims

1. A mobile treatment device for electric repair of heavy metal contaminated soil, characterized in that: It comprises a mobile carrier (10) and an electric repair mechanism (20) arranged on the mobile carrier (10); The mobile vehicle (10) comprises a supporting chassis (11), and a plurality of groups of crawler-type driving wheel groups (12) are installed at the bottom of the supporting chassis (11); The electric repair mechanism (20) comprises an outer cylindrical shell (21) arranged on the top of the supporting chassis (11) and placed horizontally, an inner cylindrical shell (22) coaxially arranged therewith is arranged inside the outer cylindrical shell (21), and an annular channel (200) is formed between the inner side wall of the outer cylindrical shell (21) and the outer side wall of the inner cylindrical shell (22); A plurality of heavy metal concentration sensors (202) are arranged on the inner side wall of the annular channel (200); An annular and hollow first containing shell (23) is provided outside the outer cylindrical shell (21), and a plurality of first electrode plates (230) extending in a direction parallel to the axis of the outer cylindrical shell (21) are provided inside the first containing shell (23); An annular and hollow second containing shell (24) is provided inside the inner cylindrical shell (22), and a plurality of second electrode plates (240) extending parallel to the axis of the inner cylindrical shell (22) are provided inside the second containing shell (24); The outer side of the outer cylindrical shell (21) is provided with a plurality of material input pipes (201) extending in the radial direction thereof and communicating with the annular channel (200); A plurality of first ion filter membranes (212) communicating with the interior of the first containing shell (23) are arranged on the side wall of the outer cylindrical shell (21); A plurality of second ion filter membranes (222) communicating with the interior of the second containing shell (24) are arranged on the side wall of the inner cylindrical shell (22).

2. According to claim 1, a mobile treatment device for electric repair of heavy metal contaminated soil is characterized in that: The side wall of the outer cylindrical shell (21) is provided with a plurality of first through grooves (210) which penetrate in the radial direction and are connected to the interior of the first containing shell (23); two first support plates (211) are provided in each of the first through grooves (210); and a first ion filter membrane (212) is provided between the two first support plates (211) in each of the first through grooves (210); The first support plate (211) has a plurality of first microholes (2110) radially extending through the outer cylindrical shell (21); The side wall of the inner cylindrical shell (22) is provided with a plurality of second through grooves (220) penetrating in the radial direction and communicating with the interior of the second accommodating shell (24); two second support plates (221) are provided in each of the second through grooves (220); and a second ion filter membrane (222) is provided between the two second support plates (221) in each of the second through grooves (220); The second support plate (221) is provided with a plurality of second micro holes (2210) which penetrate radially through the inner cylindrical shell (22).

3. The mobile treatment equipment for electric repair of heavy metal contaminated soil according to claim 1 is characterized in that: A plurality of first partition plates (231) are arranged in the first containing shell (23) and are arranged to extend along the radial plane of the outer cylindrical shell (21); the first partition plates (231) divide the interior of the first containing shell (23) into a plurality of independent first partition chambers (2310); Each of the first separated chambers (2310) has at least one first electrode plate (230); The first containing shell (23) is provided with a first electrolyte input pipe (232) and a first electrolyte output pipe (233) which are connected to the first partition chamber (2310); The second containing shell (24) is provided with a plurality of second partition plates (241) extending along the radial plane of the inner cylindrical shell (22), and the second partition plates (241) divide the interior of the second containing shell (24) into a plurality of independent second partition chambers (2410); Each of the second separated chambers (2410) has at least one second electrode plate (240); The second containing shell (24) is provided with a second electrolyte input pipe (242) and a second electrolyte output pipe (243) which are in communication with the second partition chamber (2410).

4. The mobile treatment equipment for electric repair of heavy metal contaminated soil according to claim 1 is characterized in that: The input end of the annular channel (200) is provided with a propulsion mechanism (25) for continuously propulsing the material, the propulsion mechanism (25) comprising a plurality of fan rings (251) slidably connected in the annular channel (200), the plurality of fan rings (251) together forming an annular structure coaxial with the outer cylinder shell (21); The sector ring (251) slides in a direction parallel to the axis of the outer cylinder shell (21); The input end of the outer cylindrical shell (21) has a plurality of connecting holes (2520) extending parallel to the axis thereof, a connecting rod (252) is slidably connected in the connecting hole (2520), and the plurality of fan rings (251) are fixedly connected to each connecting rod (252) in a one-to-one correspondence; The end of the outer cylinder shell (21) is provided with a plurality of accommodating cylinders (253) extending parallel to its axis, and the plurality of connecting rods (252) extend one by one into the interior of each of the accommodating cylinders (253). The accommodating cylinders (253) are provided with telescopic rods (254) for driving the connecting rods (252) to move.

5. The mobile treatment equipment for electric repair of heavy metal contaminated soil according to claim 1 is characterized in that: The output end of the annular channel (200) is provided with a material output mechanism (26), the material output mechanism (26) comprising a first constraint ring (261) provided at the output end of the outer cylindrical shell (21) and arranged coaxially therewith, the output end of the outer cylindrical shell (21) is provided with a second constraint ring (262) arranged coaxially with the first constraint ring (261), a first material output channel (260) is formed between the inner side of the second constraint ring (262) and the outer side of the first constraint ring (261), and the first material output channel (260) is communicated with the output end of the annular channel (200); A first material receiving box (264) with an opening facing upward is provided at the top of the supporting chassis (11) and below the first material output channel (260).

6. The mobile treatment equipment for electric repair of heavy metal contaminated soil according to claim 5 is characterized in that: A third constraint ring (263) coaxially arranged with the second constraint ring (262) is provided at the output end of the outer cylindrical shell (21), and a second material output channel (2601) is formed between the inner side of the third constraint ring (263) and the outer side of the second constraint ring (262); A second material receiving box (265) with an opening facing upward is provided at the top of the supporting chassis (11) and below the second material output channel (2601).

7. The mobile treatment equipment for electric repair of heavy metal contaminated soil according to claim 1 is characterized in that: A material impregnation mechanism (30) is provided in the annular channel (200), and the material impregnation mechanism (30) comprises a plurality of material impregnation plates (31) provided in the annular channel (200) and arranged along the radial plane of the outer cylinder shell (21), the interior of the material impregnation plate (31) is a hollow structure, and the side surface of the material impregnation plate (31) has a plurality of output holes (311) communicating with the interior thereof; An annular and hollow conveying shell (32) is disposed outside the outer cylinder shell (21), and the interior of the conveying shell (32) is connected to the interior of the material infiltration plate (31) via a through hole (321) disposed on the side wall of the outer cylinder shell (21); A conveying pipe (320) communicating with the interior of the conveying shell (32) is disposed outside the conveying shell (32).

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