A mobile remediation device for the electrokinetic remediation of heavy metal contaminated soil

Abstract

The application discloses a mobile treatment equipment for electrically repairing heavy metal contaminated soil, which comprises a mobile carrier and an electric repair mechanism arranged on the mobile carrier; the mobile carrier comprises a supporting chassis, and a plurality of groups of caterpillar drive wheels are arranged on the bottom of the supporting chassis; the electric repair mechanism comprises an outer cylinder shell arranged horizontally on the top of the supporting chassis, an inner cylinder shell coaxially arranged in the outer cylinder shell, and an annular channel formed between the inner side wall of the outer cylinder shell and the outer side wall of the inner cylinder shell; a plurality of heavy metal concentration sensors are arranged on the inner side wall of the annular channel; the equipment has high repair performance, can generate a stable and high-strength electric field, and can improve the distribution uniformity of the electric field in the soil, so that the heavy metals in the repair area can be effectively migrated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil remediation, in particular to a mobile treatment equipment for electrically repairing heavy metal contaminated soil. BACKGROUND

[0002] Soil is the resource for human society to survive, but with the development of industry and agriculture, the soil has been contaminated by heavy metals to varying degrees. At the same time, the soluble state heavy metals in the soil can migrate to groundwater, polluting the groundwater resources and threatening the health of human beings. Therefore, how to treat heavy metal contaminated soil has become a research hotspot.

[0003] At present, the heavy metal contaminated soil remediation technology mainly has the following three kinds: (1) removing heavy metals from contaminated soil, including soil leaching technology, plant remediation technology, thermal desorption technology, etc.; (2) fixing heavy metals in the soil, mainly including solidification and stabilization technology, vitrification technology, etc.; (3) isolating heavy metal contaminated soil from the outside world, mainly including the method of replacing soil, barrier landfill technology, etc. However, the existing remediation equipment generally has the problems of low remediation efficiency and incomplete remediation, which needs to be further improved and optimized. SUMMARY

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

[0005] To achieve the above purpose, the present application provides the following technical scheme:

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

[0007] The mobile carrier comprises a support chassis, and a plurality of caterpillar drive wheels are installed at the bottom of the support chassis;

[0008] The electric remediation mechanism comprises an outer cylinder shell arranged horizontally on the top of the support chassis, an inner cylinder shell coaxially arranged in the outer cylinder shell, and an annular channel 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 side wall of the annular channel;

[0010] The outer side of the outer cylinder shell is provided with an annular and hollow first containing shell, and a plurality of first electrode plates extending in the direction parallel to the axis of the outer cylinder shell are arranged in the first containing shell;

[0011] The inner side of the inner cylinder shell is provided with an annular and hollow second containing shell, and a plurality of second electrode plates extending in the direction parallel to the axis of the inner cylinder shell are arranged in the second containing shell;

[0012] A plurality of material input pipes are arranged on the outer side of the outer cylinder shell and extend radially along the outer cylinder shell and are connected to the annular channel;

[0013] A plurality of first ion filter membranes are arranged on the side wall of the outer cylinder shell and are connected to the interior of the first containing shell;

[0014] A plurality of second ion filter membranes are arranged on the side wall of the inner cylinder shell and are connected to the interior of the second containing shell.

[0015] Preferably, a plurality of first through-slots are arranged on the side wall of the outer cylinder shell and extend radially along the outer cylinder shell and are connected to the interior of the first containing shell, two first support plates are arranged in each first through-slot, and a first ion filter membrane is arranged between the two first support plates in each first through-slot;

[0016] A plurality of first micropores are arranged on the first support plate and extend radially along the outer cylinder shell;

[0017] A plurality of second through-slots are arranged on the side wall of the inner cylinder shell and extend radially along the inner cylinder shell and are connected to the interior of the second containing shell, two second support plates are arranged in each second through-slot, and a second ion filter membrane is arranged between the two second support plates in each second through-slot;

[0018] A plurality of second micropores are arranged on the second support plate and extend radially along the inner cylinder shell.

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

[0020] Preferably, a plurality of first partition plates are arranged in the first containing shell and extend radially along the outer cylinder shell, and the first partition plates divide the first containing shell into a plurality of independent first partition chambers;

[0021] At least one first electrode plate is arranged in each first partition chamber;

[0022] A first electrolyte input pipe and a first electrolyte output pipe are arranged on the first containing shell and are connected to the first partition chambers;

[0023] A plurality of second partition plates are arranged in the second containing shell and extend radially along the inner cylinder shell, and the second partition plates divide the second containing shell into a plurality of independent second partition chambers;

[0024] At least one second electrode plate is arranged in each second partition chamber;

[0025] A second electrolyte input pipe and a second electrolyte output pipe are arranged on the second containing shell and are connected to the second partition chambers.

[0026] The plurality of first partition chambers and the plurality of second partition chambers facilitate more accurate partition control of the heavy metal contaminated soil, the plurality of heavy metal concentration sensors are used to monitor the concentration of heavy metal ions in the heavy metal contaminated soil in real time, the power supply parameters of each power supply are flexibly adjusted according to the concentration distribution of the heavy metal ions, and then the electric field strength between each group of first electrode plates and second electrode plates is adjusted.

[0027] Preferably, the input end of the annular channel is provided with a pushing mechanism for continuously pushing the material, the pushing mechanism comprising a plurality of sector rings slidingly connected in the annular channel, the plurality of sector rings collectively forming an annular structure coaxial with the outer cylinder shell;

[0028] The sector ring moves 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 connection holes penetrating through parallel to its axis, and a connecting rod is slidingly connected in the connection hole, and the plurality of sector rings are fixedly connected to the respective connecting rods one by one;

[0030] The end of the outer cylinder shell is provided with a plurality of accommodating cylinders extending parallel to its axis, and the plurality of connecting rods extend into the respective accommodating cylinders one by one, and the accommodating cylinders are provided with telescopic rods for driving the connecting rods to move.

[0031] The pushing mechanism is used to continuously push the heavy metal contaminated soil input into the annular channel from the input end to the output end.

[0032] Preferably, the output end of the annular channel is provided with a material output mechanism, the material output mechanism comprising a first constraint ring arranged coaxially with the outer cylinder shell at the output end of the outer cylinder shell, the output end of the outer cylinder shell is provided with a second constraint ring arranged coaxially with the first constraint ring, 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 connected with the output end of the annular channel;

[0033] The top of the support base plate is provided with a first material receiving box with an opening facing upward below the first material output channel.

[0034] The heavy metal contaminated soil after the last electrodynamic repair is discharged through the first material output channel and falls into the first material receiving box for temporary storage.

[0035] Preferably, the output end of the outer cylinder shell is provided with a third constraint ring arranged coaxially with the second constraint ring, 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] The top of the support base plate is provided with a second material receiving box with an opening facing upward below the second material output channel.

[0037] Explanation: There may still be some heavy metal ions remaining in the soil near the edge of the annular channel, which is discharged separately through the second material output channel and transported into the annular channel for further treatment, which helps to more thoroughly remove heavy metal pollutants in the soil.

[0038] Preferably, a material soaking mechanism is arranged in the annular channel, which comprises a plurality of material soaking plates arranged in the annular channel along the radial plane of the outer cylinder shell, the material soaking plates are hollow inside, and the side surfaces of the material soaking plates have a plurality of output holes connected with the interiors 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 interiors of the material soaking plates through the through holes arranged on the side wall of the outer cylinder shell;

[0040] A conveying pipe is arranged outside the conveying shell and connected with the interior thereof.

[0041] Explanation: By using the material soaking mechanism to input the buffer solution into the ceramsite-heavy metal contaminated soil mixture, the pH of the solution can be maintained within a certain range, avoiding the drastic change of the pH of the soil during the electric remediation process.

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

[0043] 1、The structure of the present application is reasonable in design, has high remediation performance, can generate a stable and high-strength electric field, and can improve the uniformity of the electric field in the soil, so as to ensure that the heavy metals in the remediation area can be effectively migrated;

[0044] 2、The present application optimizes the mass transfer process, by injecting an appropriate amount of electrolyte into the soil, improving the electrical conductivity of the soil, which can accelerate the migration speed of heavy metal ions in the soil, and at the same time, during the treatment process, the ceramsite and the powdered heavy metal contaminated soil are uniformly mixed 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 application has rapid deployment capability and mobility design, which improves the emergency response capability of the equipment, and 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 operation;

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

[0047] 5、The application has good heavy metal pollution treatment capacity, has the ability of cooperative repair for multiple heavy metals, and can dynamically adjust the repair parameters by monitoring the concentration change of multiple heavy metals in the soil in real time, to ensure the pertinence and effectiveness of the repair process. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is the front view of the application;

[0049] Figure 2 is the left view of the electric repair mechanism of the application;

[0050] Figure 3 is the left view of the first support plate of the application;

[0051] Figure 4 is the left view of the second support plate of the application;

[0052] Figure 5 is the structural schematic view of the advancing mechanism of the application;

[0053] Figure 6 is the left view of Figure 5 ;

[0054] Figure 7 is the structural schematic view of the material output mechanism of the application;

[0055] Figure 8 is the structural schematic view of the material soaking mechanism of the application;

[0056] Figure 9 is the left view of the material soaking mechanism of the application;

[0057] Figure 10 is the left view of the material soaking plate of the application.

[0058] In the diagram, 10-Mobile vehicle, 11-Support chassis, 12-Crawler drive wheel assembly, 20-Electric repair mechanism, 200-Annular channel, 201-Material input pipe, 202-Heavy metal concentration sensor, 21-Outer shell, 210-First channel, 211-First support plate, 2110-First micropore, 212-First ion filter membrane, 22-Inner shell, 220-Second channel, 221-Second support plate, 222-Second ion filter membrane, 23-First receiving 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 receiving 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-Containing cylinder, 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 impregnation mechanism, 31-Material impregnation plate, 311-Output hole, 32-Conveying shell, 320-Conveying pipe, 321-Through hole. Detailed Implementation

[0059] The following is combined Figures 1-10 The present invention will be described in detail below. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of the respective main view or structural schematic diagram.

[0060] Example 1: A mobile remediation device for electrically powered heavy metal contaminated soil, such as... Figure 1 As shown, it includes a mobile vehicle 10 and an electric repair mechanism 20 mounted on the mobile vehicle 10;

[0061] The mobile vehicle 10 includes a support chassis 11, and multiple sets of tracked drive wheel sets 12 are mounted on the bottom of the support chassis 11;

[0062] The tracked drive wheel set 12 is a tracked drive wheel set driven by an electric motor in the prior art, and the suspension of the tracked drive wheel set 12 is fixedly connected to the bottom of the supporting chassis 11.

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

[0064] like Figure 1As shown, the electric repair mechanism 20 includes an outer shell 21 that is located on top of the support chassis 11 and placed horizontally. An inner shell 22 is arranged coaxially with the outer shell 21. An annular channel 200 is formed between the inner wall of the outer shell 21 and the outer wall of the inner shell 22.

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

[0066] The heavy metal concentration sensor 202 is existing technology; for example, it could be an X-ray fluorescence spectroscopy sensor.

[0067] like Figure 1 As shown, an annular and hollow first receiving shell 23 is provided on the outer side of the outer cylinder shell 21, and a plurality of first electrode plates 230 extending in a direction parallel to the axis of the outer cylinder shell 21 are provided inside the first receiving shell 23.

[0068] The first electrode plate 230 is based on existing technology; for example, a titanium-plated platinum electrode can be used.

[0069] The inner cylinder shell 22 has an annular and hollow second receiving shell 24 inside, and the second receiving shell 24 has a plurality of second electrode plates 240 extending along the axis parallel to the inner cylinder shell 22.

[0070] The second electrode plate 240 is existing technology; for example, an aluminum electrode can be used.

[0071] Multiple material input pipes 201 extending radially along the outer shell 21 and connected to the annular channel 200 are provided on the outer side of the outer shell 21;

[0072] like Figure 3 As shown, multiple first ion filter membranes 212 communicating with the interior of the first receiving shell 23 are provided on the side wall of the outer shell 21.

[0073] like Figure 4 As shown, multiple second ion filter membranes 222 communicating with the interior of the second receiving shell 24 are provided on the side wall of the inner cylinder shell 22.

[0074] According to the flow direction of 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 shell 21 is also divided into an input end near the material input pipe 201 and an output end far away from the material input pipe 201.

[0076] like Figure 3As shown, the outer cylinder shell 21 has a plurality of first through-slots 210 penetrating through the sidewall of the outer cylinder shell 21 in the radial direction and communicating with the interior of the first containing shell 23, and two first support plates 211 are arranged in each first through-slot 210, and a first ion filter membrane 212 is arranged between the two first support plates 211 in each first through-slot 210;

[0077] The first ion filter membrane 212 is a composite membrane composed of an ultrafiltration membrane and an ion exchange membrane of 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 micropores 2110 penetrating through the outer cylinder shell 21 in the radial direction;

[0079] The first micropore 2110 is a micropore with a diameter of 0.1-0.5 mm;

[0080] As shown, Figure 4 The inner cylinder shell 22 has a plurality of second through-slots 220 penetrating through the sidewall of the inner cylinder shell 22 in the radial direction and communicating with the interior of the second containing shell 24, and two second support plates 221 are arranged in each second through-slot 220, and a second ion filter membrane 222 is arranged between the two second support plates 221 in each second through-slot 220;

[0081] The second ion filter membrane 222 is a composite membrane composed of an ultrafiltration membrane and an ion exchange membrane of 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 micropores 2210 penetrating through the inner cylinder shell 22 in the radial direction;

[0083] The second micropore 2210 is a micropore with a diameter of 0.1-0.5 mm.

[0084] As shown, Figure 2 The first containing shell 23 has a plurality of first partition plates 231 arranged in the radial plane of the outer cylinder shell 21, and the first partition plates 231 divide the interior of the first containing 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;

[0086] As shown, Figure 1The first accommodating shell 23 is provided with a first electrolyte input pipe 232 and a first electrolyte output pipe 233 which are in communication with the first partition chamber 2310.

[0087] The second accommodating shell 24 is provided with a plurality of second partition plates 241 which are arranged along the radial plane of the inner cylinder shell 22, and the second partition plates 241 divide the second accommodating shell 24 into a plurality of independent second partition chambers 2410.

[0088] Each second partition chamber 2410 is provided with at least one second electrode plate 240.

[0089] As shown in Figure 1 The second accommodating 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.

[0090] As shown in Figure 1 The input end of the annular channel 200 is provided with a pushing mechanism 25 for continuously pushing the material, as shown in Figure 5 The pushing mechanism 25 includes a plurality of sector rings 251 which are slidingly connected in the annular channel 200, as shown in Figure 6 The plurality of sector rings 251 jointly form an annular structure which is coaxial with the outer cylinder shell 21.

[0091] The sector rings 251 slide in the direction parallel to the axis of the outer cylinder shell 21.

[0092] The input end of the outer cylinder shell 21 is provided with a plurality of connecting holes 2520 which are through the axis of the outer cylinder shell 21, and the connecting holes 2520 are slidingly connected with connecting rods 252, and the plurality of sector rings 251 are one-to-one fixedly connected with the connecting rods 252.

[0093] The end of the outer cylinder shell 21 is provided with a plurality of accommodating cylinders 253 which extend parallel to the axis of the outer cylinder shell 21, and the plurality of connecting rods 252 are one-to-one extended into the inner part of the accommodating cylinders 253, and the accommodating cylinders 253 are provided with telescopic rods 254 for driving the connecting rods 252 to move.

[0094] The telescopic rod 254 is an electric control telescopic rod driven by a servo motor which is a prior art, and the outer rod end of the telescopic rod 254 is fixedly connected with the inner end of the accommodating cylinder 253, and the inner rod end of the telescopic rod 254 is fixedly connected with the connecting rod 252.

[0095] As shown in Figure 1 The output end of the annular channel 200 is provided with a material output mechanism 26, as shown in Figure 7As shown, the material output mechanism 26 comprises a first constraint ring 261 arranged coaxially at the output end of the outer cylinder shell 21, and the output end of the outer cylinder shell 21 is provided with a second constraint ring 262 arranged coaxially with the first constraint ring 261, and 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 connected to the output end of the annular channel 200;

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

[0097] The top of the support base plate 11 is provided with a first material receiving box 264 with an upward opening below the first material output channel 260.

[0098] Embodiment 2: based on embodiment 1, as shown in Figure 7 The output end of the outer cylinder shell 21 is provided with a third constraint ring 263 arranged coaxially with the second constraint ring 262, 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, and the second material output channel 2601 forms a concentric circular ring structure outside the first material output channel 260,

[0100] The top of the support base plate 11 is provided with a second material receiving box 265 with an upward opening below the second material output channel 2601.

[0101] Embodiment 3: based on embodiment 2, as shown in Figure 1 The annular channel 200 is provided with a material infiltration mechanism 30, as shown in Figure 8 、 Figure 9 and Figure 10 The material infiltration mechanism 30 comprises a plurality of material infiltration plates 31 arranged in the annular channel 200 and arranged along the radial plane of the outer cylinder shell 21, the inside of the material infiltration plate 31 is hollow, and the side of the material infiltration plate 31 has a plurality of output holes 311 connected to the inside thereof;

[0102] The outer side of the outer cylinder shell 21 is provided with an annular and hollow conveying shell 32, and the inside of the conveying shell 32 is connected to the inside of the material infiltration plate 31 through the through hole 321 arranged on the side wall of the outer cylinder shell 21;

[0103] The outer side of the conveying shell 32 is provided with a conveying pipe 320 connected to the inside thereof.

[0104] In the actual application process, 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 of the annular channel 200, the annular channel 200 is sequentially divided into a material input pipe 201 and an input pushing chamber at the pushing mechanism 25, an infiltration chamber at the material infiltration mechanism 30, and an electric repair chamber at the first containing shell 23 and the second containing shell 24.

[0105] In the actual application process, the heavy metal contaminated soil to be repaired is first naturally aired to remove the water in the heavy metal contaminated soil, so that the water in the heavy metal contaminated soil is reduced to below 5%;

[0106] The heavy metal contaminated soil is then crushed to make the heavy metal contaminated soil into a powder. The ceramsite with a particle size of 5mm±1mm is uniformly mixed with the powder-shaped heavy metal contaminated soil at a volume ratio of 1:1 to form a ceramsite-heavy metal contaminated soil mixture, which is ready for use.

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

[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 the pushing mechanism 25.

[0109] The inner rods of the plurality of telescopic rods 254 are synchronously extended or retracted, which can drive the plurality of fan rings 251 to reciprocally move along the axis direction of the outer cylindrical shell 21 in the annular channel 200.

[0110] The movement process of the plurality of fan rings 251 from the input end to the output end is a pushing stroke, and the movement process of the plurality of fan rings 251 from the output end to the input end is a reset stroke.

[0111] In the pushing stroke, the plurality of fan rings 251 can push the ceramsite-heavy metal contaminated soil mixture in the annular channel 200 to move from the input end to the output end, and in the pushing stroke, the transportation of the ceramsite-heavy metal contaminated soil mixture into the annular channel 200 is stopped.

[0112] In the reset stroke, the transportation of the ceramsite-heavy metal contaminated soil mixture into the annular channel 200 is continued, and the ceramsite-heavy metal contaminated soil mixture input into the annular channel 200 is continuously pushed from the input end to the output end in this way.

[0113] The ceramic heavy metal contaminated soil mixture is infiltrated into the infiltration chamber, and the buffer solution is input into the ceramic heavy metal contaminated soil mixture by 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, avoid the sharp change of the pH of the soil in the electrodynamic repair process, and at the same time, the citrate ions can form a complex with some heavy metal ions, increase the solubility and migration of the heavy metal ions in the solution, and help to improve the repair effect;

[0114] The buffer solution is input into the inside of the conveying shell 32 by the conveying pump of the prior art, and the buffer solution in the inside of the conveying shell 32 enters the inside of each material infiltration plate 31 through the through hole 321, and finally the buffer solution in the inside of the material infiltration plate 31 is discharged through the plurality of output holes 311 and mixed in the ceramic heavy metal contaminated soil mixture;

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

[0116] The ceramic heavy metal contaminated soil mixture continues to move in the annular channel 200 and passes through the electrodynamic repair chamber, and the inside of the first containing shell 23 and the second containing shell 24 is filled with an electrolyte solution, which is specifically a 0.1 mol / L sodium chloride solution;

[0117] The first electrode plate 230 and the second electrode plate 240 are connected to the positive and negative poles of the external direct current power supply respectively, and the specification of the external direct current power supply is 110V, 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 ceramic heavy metal contaminated soil mixture will migrate along the radial direction of the outer cylinder shell 21, and finally pass through the first ion filter membrane 212 into the inside of the first containing shell 23, or pass through the second ion filter membrane 222 into the inside of the second containing shell 24;

[0120] The cations in the ceramic heavy metal contaminated soil mixture, such as lead ions Pb 2+ , cadmium ions Cd 2+ , copper ions Cu 2+ , and zinc ions Zn 2+ will migrate towards the negative pole of the electric field, and finally pass through the second ion filter membrane 222 into the inside of the second containing shell 24;

[0121] The anions in the ceramic heavy metal contaminated soil mixture, such as chromate ions CrO4 2- , dichromate ions Cr2O72- arsenate ions AsO4 3- arsenite ions AsO3 3- Will migrate to the positive direction of the electric field, and finally pass through the first ion filter membrane 212 into the first containing shell 23 inside;

[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, each group of the first electrode plate 230 and the second electrode plate 240 is powered by an independent power supply, and the plurality of 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. According to the concentration distribution of heavy metal ions, the power supply parameters of each power supply are flexibly adjusted, and then the electric field strength between each group of the first electrode plate 230 and the second electrode plate 240 is adjusted;

[0123] For the area with high concentration of heavy metal ions, the electric field strength is increased, and for the area with high concentration of heavy metal ions, the electric field strength is decreased;

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

[0125] Part of the 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 transported again through the material input pipe 201 into the annular channel 200 for further treatment, which is conducive to more thoroughly removing heavy metal pollutants in the ceramsite-heavy metal contaminated soil mixture.

[0126] The ceramsite-heavy metal contaminated soil mixture after repair can be screened out by using the existing screening machine, and clean and uncontaminated soil can be obtained.

Claims

1. A mobile remediation device for electrically powered heavy metal contaminated soil, characterized in that, The utility model relates to a mobile carrier (10), electric repair mechanism (20) is arranged on the mobile carrier (10); The mobile carrier (10) includes a support chassis (11) having a plurality of track drive wheel sets (12) mounted on the bottom of the support chassis (11); The electric repair mechanism (20) includes an outer cylinder shell (21) arranged horizontally on the top of the support chassis (11), and an inner cylinder shell (22) coaxially arranged in 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); A plurality of heavy metal concentration sensors (202) are arranged on the inner side wall of the annular channel (200); The outer side of the outer cylinder shell (21) is provided with a first containing shell (23) which is annular and hollow, and a plurality of first electrode plates (230) extending along the axis direction of the outer cylinder shell (21) are arranged in the first containing shell (23); The inner side of the inner cylinder shell (22) is provided with a second containing shell (24) which is annular and hollow, and a plurality of second electrode plates (240) extending along the axis direction of the inner cylinder shell (22) are arranged in the second containing shell (24); The outer side of the outer cylinder shell (21) is provided with a plurality of material input pipes (201) extending along the radial direction of the outer cylinder shell (21) and communicating with the annular channel (200); A plurality of first ion filter membranes (212) are arranged on the side wall of the outer cylinder shell (21) and communicate with the inside of the first containing shell (23); A plurality of second ion filter membranes (222) are arranged on the side wall of the inner cylinder shell (22) and communicate with the inside of the second containing shell (24); The side wall of the outer cylinder shell (21) has a plurality of first through grooves (210) extending along the radial direction of the outer cylinder shell (21) and communicating with the inside of the first containing 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); The first support plates (211) have a plurality of first micropores (2110) extending along the radial direction of the outer cylinder shell (21); The side wall of the inner cylinder shell (22) has a plurality of second through grooves (220) extending along the radial direction of the inner cylinder shell (22) and communicating with the inside of the second containing 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); The second support plates (221) have a plurality of second micropores (2210) extending along the radial direction of the inner cylinder shell (22); A plurality of first partition plates (231) extending along the radial plane of the outer cylinder shell (21) are arranged in the first containing shell (23), and the first containing shell (23) is divided into a plurality of independent first partition chambers (2310) by the first partition plates (231); Each first partition chamber (2310) has at least one first electrode plate (230). The first accommodating shell (23) is provided with a first electrolyte input pipe (232) and a first electrolyte output pipe (233) which are in communication with the first partition chamber (2310); The second accommodating shell (24) is provided with a plurality of second partition plates (241) which are arranged along the radial plane of the inner cylinder shell (22) and extend in the radial direction of the inner cylinder shell (22), and the second partition plates (241) divide the second accommodating shell (24) into a plurality of independent second partition chambers (2410); Each of the second partition chambers (2410) is provided with at least one second electrode plate (240); The second accommodating 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 chambers (2410); The input end of the annular channel (200) is provided with a pushing mechanism (25) for continuously pushing the material, and the pushing mechanism (25) comprises a plurality of fan rings (251) which are slidingly connected in the annular channel (200), and the plurality of fan rings (251) jointly form an annular structure which is coaxial with the outer cylinder shell (21); The fan rings (251) slide in the direction parallel to the axis of the outer cylinder shell (21); The input end of the outer cylinder shell (21) is provided with a plurality of connecting holes (2520) which penetrate through the axis of the outer cylinder shell (21), and the connecting holes (2520) are slidingly connected with connecting rods (252), and each of the plurality of fan rings (251) is fixedly connected with a connecting rod (252); The end of the outer cylinder shell (21) is provided with a plurality of accommodating cylinders (253) which extend in parallel with the axis of the outer cylinder shell (21), and each of the plurality of connecting rods (252) extends into the inside of each of the accommodating cylinders (253), and the accommodating cylinders (253) are provided with telescopic rods (254) for driving the connecting rods (252) to move.

2. The mobile remediation apparatus for electrically remediating heavy metal contaminated soil of claim 1, wherein, The output end of the annular channel (200) is provided with a material output mechanism (26), and the material output mechanism (26) comprises a first constraint ring (261) which is arranged coaxially with the outer cylinder shell (21) at the output end of the outer cylinder shell (21), the output end of the outer cylinder shell (21) is provided with a second constraint ring (262) which is 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 in communication with the output end of the annular channel (200); The top of the support base plate (11) is provided with a first material receiving box (264) which is open upward and located below the first material output channel (260).

3. The mobile remediation apparatus for electrically remediating heavy metal contaminated soil of claim 2, wherein, The output end of the outer cylinder shell (21) is provided with a third constraint ring (263) which is arranged coaxially with the second constraint ring (262), 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); The top of the support base plate (11) is provided with a second material receiving box (265) which is open upward and located below the second material output channel (2601).

4. The mobile remediation apparatus for electrically remediating heavy metal contaminated soil of claim 1, wherein, The annular channel (200) is internally provided with a material soaking mechanism (30), which comprises a plurality of material soaking plates (31) arranged in the annular channel (200) and along the radial plane of the outer cylinder shell (21), the material soaking plate (31) is internally hollow, and the side of the material soaking plate (31) is provided with a plurality of output holes (311) in communication with the inside of the material soaking plate (311); The outer side of the outer cylinder shell (21) is provided with an annular and hollow conveying shell (32), and the inside of the conveying shell (32) is in communication with the inside of the material soaking plate (31) through the through hole (321) provided on the side wall of the outer cylinder shell (21); The outer side of the conveying shell (32) is provided with a conveying pipe (320) in communication with the inside of the conveying shell (320).

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