An in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar

Abstract

The present invention discloses an in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar, comprising a vehicle-mounted drive structure, a grooving mechanism, a biochar adsorption mechanism and a backfilling mechanism arranged on the vehicle-mounted drive structure; the vehicle-mounted drive structure comprises a vehicle-mounted support plate and a plurality of crawler-type drive wheel groups connected to the bottom of the vehicle-mounted support plate; the grooving mechanism comprises a sprocket support frame connected to the side of the vehicle-mounted support plate, two grooving drive sprockets rotatably connected to the sprocket support frame, a grooving drive chain is transmission-connected between the two grooving drive sprockets, and a plurality of grooving buckets are fixed to the outside of the grooving drive chain; the biochar adsorption mechanism comprises a positive pressure circulation mechanism and a split module adsorption mechanism; the positive pressure circulation mechanism can force the Cd and As elements remaining in the soil to dissolve and migrate horizontally, and then the split module adsorption mechanism is used to adsorb and filter the solvent containing the Cd and As, thereby removing the Cd and As elements in the soil.

Description

Technical Field

[0001] The present invention relates to the technical field of contaminated soil remediation, and in particular to an in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar. Background Art

[0002] Cd-As co-contaminated soils are characterized by complex pollutant morphologies. Cd can exist in various forms in soil, including exchangeable, carbonate-bound, iron-manganese oxide-bound, organically bound, and residual. Exchangeable Cd is the most active and is most readily absorbed and leached by plants. For example, in acidic soils, the proportion of exchangeable Cd may increase because the acidic environment releases Cd from other bound forms. As in soils exists in two main valence states: trivalent (As(III)) and pentavalent (As(V)). As(III) exists primarily as arsenite (H3AsO3) and its salts, which are relatively mobile. As(V) exists primarily as arsenic acid (H3AsO4) and its salts, which are more readily adsorbed by soil particles. Furthermore, As can form complex compounds with iron, aluminum, manganese, and other oxides in the soil. The stability of these compounds varies depending on the soil environment. In co-contaminated soils, the toxicity of Cd and As may have a cumulative effect, causing even greater harm to soil organisms and surrounding ecosystems.

[0003] At present, the remediation process for Cd-As composite contaminated soil is not ideal, the remediation effect is unsatisfactory, and the relevant remediation equipment of existing technology needs to be further improved and optimized. Summary of the Invention

[0004] The purpose of the present invention is to provide an in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar, which can effectively remove Cd and As remaining in the soil.

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

[0006] An in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar, comprising a vehicle-mounted drive structure, a grooving mechanism, a biochar adsorption mechanism, and a backfilling mechanism arranged on the vehicle-mounted drive structure;

[0007] The vehicle-mounted driving structure includes a vehicle-mounted support plate and a plurality of crawler-type driving wheel sets connected to the bottom of the vehicle-mounted support plate;

[0008] The grooving mechanism includes a sprocket support frame connected to the side of the vehicle support plate, two grooving drive sprockets rotatably connected to the sprocket support frame, a grooving drive chain is transmission-connected between the two grooving drive sprockets, and a plurality of grooving buckets are fixed on the outside of the grooving drive chain;

[0009] The biochar adsorption mechanism includes a positive pressure circulation mechanism connected to the top of the vehicle-mounted support plate through a positive pressure lifting mechanism;

[0010] The positive pressure circulation mechanism includes a positive pressure circulation support square shell with two through-holes, the two open ends of the positive pressure circulation support square shell are respectively slidably connected to a positive pressure circulation close shell with openings facing each other, a partition support plate is fixed in the positive pressure circulation support square shell, and a plurality of positive pressure steam nozzles are fixed on the side of the partition support plate;

[0011] The side of the vehicle-mounted support plate is connected to a split module adsorption mechanism via an adsorption lifting mechanism. The split module adsorption mechanism comprises a split adsorption shell, a plurality of module adsorption accommodating shells fixed in the split adsorption shell, and a plurality of adsorption carrier accommodating shells (323) fixed in the module adsorption accommodating shell.

[0012] Preferably, the sprocket support frame includes a sprocket upper support frame and a sprocket lower support frame fixed to the lower end of the sprocket upper support frame, the upper sprocket support frame is fixed with an upper sprocket rotating shaft, the lower sprocket support frame is fixed with a lower sprocket rotating shaft, one of the grooved drive sprockets is rotatably connected to the upper sprocket rotating shaft, the other grooved drive sprocket is rotatably connected to the lower sprocket rotating shaft, the two grooved drive sprockets are arranged in a vertical direction, and the two grooved drive sprockets are in the same vertical plane.

[0013] Description: Using a continuously rotating trenching drive sprocket to drive multiple trenching buckets can achieve continuous and efficient trenching work, and the trenches dug are smoother.

[0014] Preferably, the sprocket upper support frame is connected to the vehicle-mounted support plate through a grooved lifting mechanism, the grooved lifting mechanism includes a grooved lifting fixed cylinder fixed on the top of the vehicle-mounted support plate and with an opening facing upward, a grooved lifting movable cylinder with an opening facing downward being slidably connected to the outer side of the grooved lifting fixed cylinder, and the sprocket upper support frame is fixedly connected to the outer side of the grooved lifting movable cylinder;

[0015] A groove lifting driving rod for driving the groove lifting movable cylinder to move up and down is arranged in the groove lifting fixed cylinder.

[0016] Description: The trenching lifting mechanism controls the position height of the entire trenching drive chain, thereby controlling the depth of the excavated trench.

[0017] Preferably, the positive pressure circulation close housing is driven to slide by an outward-extending close mechanism provided on the side of the partition support plate, the outward-extending close mechanism comprising an outward-extending drive fixed cylinder fixed to the side of the partition support plate, an outward-extending drive sliding cylinder slidably connected in the outward-extending drive fixed cylinder, and an outer end of the outward-extending drive sliding cylinder is fixedly connected to the positive pressure circulation close housing;

[0018] An outward drive rod for driving the outward drive sliding cylinder to move is arranged in the outward drive fixed cylinder.

[0019] Description: The outward-extending close mechanism can ensure that the positive pressure flow is close to the shell and fits more closely with the soil, which is conducive to more effective injection of solvent vapor into the soil, so as to effectively dissolve the residual Cd and As elements in the soil.

[0020] Preferably, the vehicle-mounted support plate is provided with a vertically penetrating positive pressure lifting through-hole, the positive pressure lifting mechanism comprises a positive pressure lifting fixed inner shell fixed on the top of the vehicle-mounted support plate at the positive pressure lifting through-hole and with an opening facing upward, a positive pressure lifting sliding outer shell with an opening facing upward is slidably connected to the outer side of the positive pressure lifting fixed inner shell, the positive pressure lifting sliding outer shell is fixedly connected to the top of the positive pressure circulation support square shell through a positive pressure lifting connecting frame, and the positive pressure circulation support square shell is arranged directly below the positive pressure lifting through-hole;

[0021] A positive pressure lifting driving rod for driving the positive pressure lifting sliding outer shell to move up and down is arranged in the positive pressure lifting fixed inner shell.

[0022] Description: The positive pressure lifting mechanism can control the position height of the positive pressure circulation support square shell and the positive pressure circulation close to the shell as a whole, and according to the depth of the groove, the positive pressure circulation support square shell and the positive pressure circulation close to the shell are accurately placed in the groove.

[0023] Preferably, the module adsorption containment shell is closely fixed on the side wall of the split adsorption shell near the positive pressure circulation support square shell, and the side wall of the split adsorption shell has a plurality of adsorption input through holes connected to the interior of the module adsorption containment shell;

[0024] An exhaust gas converging and conveying shell is fixed on the other side of the module adsorption accommodating shell. The side wall of the module adsorption accommodating shell has multiple adsorption output through holes connected to the exhaust gas converging and conveying shell. An exhaust gas converging and conveying pipe connected to the inside of the exhaust gas converging and conveying shell is fixed on the outside of the exhaust gas converging and conveying shell.

[0025] The adsorption lifting mechanism includes an adsorption lifting fixed inner shell fixed at the top side edge of the vehicle support plate and with an opening facing upwards, an adsorption lifting sliding outer shell with an opening facing downwards being slidably connected to the outer side of the adsorption lifting fixed inner shell, and the adsorption lifting sliding outer shell is fixedly connected to the top of the split adsorption outer shell through an adsorption lifting connecting frame;

[0026] An adsorption lifting driving rod for driving the adsorption lifting sliding outer shell to move up and down is arranged in the adsorption lifting fixed inner shell.

[0027] Description: The position height of the split adsorption shell is controlled by the adsorption lifting mechanism so that the split adsorption shell can be accurately placed deep into the groove.

[0028] Preferably, multiple exhaust gas concentration filter boxes are fixed on the top of the vehicle support plate, and each exhaust gas collection and delivery pipe is connected to the exhaust gas concentration filter box. The exhaust gas concentration filter box is connected to the input end of an exhaust pump through a pipe, and the exhaust pump is used to vacuum the inside of the exhaust gas concentration filter box.

[0029] Note: The exhaust gas after iron-modified biochar adsorption filtration is then filtered and treated in a centralized exhaust gas filter box to avoid exhaust gas being discharged into the air and causing secondary pollution to the atmosphere.

[0030] Preferably, a plurality of solvent storage boxes are fixed on the top of the vehicle support plate, and a solvent delivery pump is provided in the solvent storage box;

[0031] A solvent heating furnace and a solvent vapor delivery pump are fixed on the top of the vehicle support plate. The output end of the solvent delivery pump is connected to the input end of the solvent heating furnace through a pipeline. The steam output pipe of the solvent heating furnace is connected to the input end of the solvent vapor delivery pump. The output end of the solvent vapor delivery pump is connected to each positive pressure steam nozzle through a pipeline.

[0032] Description: The solvent used to repair contaminated soil is heated into high-temperature steam using a solvent heating furnace. The steamed solvent can be well injected into the contaminated soil.

[0033] Preferably, the backfill mechanism comprises a backfill mechanism support plate connected to the vehicle-mounted support plate via a steering connection mechanism, and a plurality of crawler-type drive wheel sets are installed at the bottom of the backfill mechanism support plate;

[0034] The backfill mechanism support plate has a plurality of backfill connection holes arranged in pairs and vertically penetrating therethrough, a vertically extending backfill support shaft is rotatably connected in the backfill connection holes, and a backfill guide constraint plate is fixed to the lower end of the backfill support shaft;

[0035] A backfill steering mechanism is provided at the top of the backfill mechanism support plate at the backfill support shaft. The backfill steering mechanism includes a steering drive accommodating shell fixed at the top of the backfill mechanism support plate at the backfill connecting through hole. The upper end of the backfill support shaft extends into the interior of the steering drive accommodating shell. A steering drive worm gear is fixed to the upper end of the backfill support shaft. A steering drive motor is fixed in the steering drive accommodating shell. The output shaft of the steering drive motor is connected to the steering drive worm through a coupling, and the steering drive worm is meshed with the steering drive worm gear.

[0036] Description: The backfill mechanism can be used to backfill the soil generated by trenching into the trench, so that the repaired soil area can be restored to a flat surface.

[0037] Preferably, the steering connection mechanism includes a first steering connection seat fixed to the right end of the vehicle-mounted support plate, a vertically extending steering connection shaft is fixed to the first steering connection seat, a second steering connection seat is fixed to the left end of the backfill mechanism support plate, the second steering connection seat has a vertically through steering connection hole, and the steering connection shaft is rotatably connected to the steering connection hole;

[0038] A steering drive rod is provided between the right end of the vehicle-mounted support plate and the left end of the backfill mechanism support plate.

[0039] Description: The steering connection mechanism can drive the backfill mechanism support plate to deflect relative to the vehicle support plate around the steering connection axis, so as to control the relative position of each backfill guide constraint plate, so as to facilitate more accurate backfilling work.

[0040] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0041] 1. The present invention has a reasonable structural design. First, a trenching mechanism is used to dig parallel trenches in the area to be repaired, thereby dividing the area to be repaired into multiple small areas, so that each small area can be purified separately.

[0042] 2. The present invention utilizes a positive pressure circulation mechanism to force the Cd and As elements remaining in the soil to migrate horizontally, uses environmentally friendly and pollution-free solvent vapor to dissolve the Cd and As elements remaining in the soil, and then uses a split module adsorption mechanism to adsorb and filter the solvent containing the Cd and As, thereby achieving the removal of Cd and As elements in the soil;

[0043] 3. The present invention is easy to operate, wherein the outwardly extending close mechanism can ensure positive pressure circulation and a closer fit between the shell and the soil, which is conducive to more effective injection of solvent vapor into the soil, so as to effectively dissolve the residual Cd and As elements in the soil;

[0044] 4. The backfill mechanism of the present invention can backfill the soil generated by trenching into the trench, so that the repaired soil area can be restored to a flat surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a front view of the present invention;

[0046] Figure 2 yes Figure 1 Left view of;

[0047] Figure 3 yes Figure 1 Right view of;

[0048] Figure 4 yes Figure 1 A top view of

[0049] Figure 5 yes Figure 1 Bottom view of

[0050] Figure 6 It is a structural schematic diagram of the sprocket support frame of the present invention;

[0051] Figure 7 yes Figure 6 Left view of;

[0052] Figure 8It is a right side view of the positive pressure circulation mechanism of the present invention;

[0053] Figure 9 It is a right side view of the split module adsorption mechanism of the present invention;

[0054] Figure 10 It is a left side view of the backfill mechanism of the present invention;

[0055] Figure 11 It is a left side view of the backfill steering mechanism of the present invention;

[0056] Figure 12 yes Figure 11 Top view of .

[0057] In the figure, 10-vehicle drive structure, 11-vehicle support plate, 12-crawler drive wheel group, 20-grooving mechanism, 21-sprocket support frame, 211-sprocket upper support frame, 2110-upper sprocket shaft, 212-sprocket lower support frame, 2120-lower sprocket shaft, 22-grooving drive sprocket, 23-grooving drive chain, 24-grooving bucket, 25-grooving lifting mechanism, 251-grooving lifting fixed cylinder, 252-grooving lifting movable cylinder, 253-grooving lifting drive rod, 30-biochar adsorption mechanism , 31-positive pressure circulation mechanism, 310-positive pressure steam nozzle, 311-positive pressure circulation support square shell, 312-positive pressure circulation close to the shell, 313-partition support plate, 32-split module adsorption mechanism, 321-split adsorption shell, 3210-adsorption input through hole, 322-module adsorption containing shell, 3220-adsorption output through hole, 323-adsorption carrier containing shell, 324-exhaust gas convergence and delivery shell, 325-exhaust gas convergence and delivery pipe, 33-extending close mechanism, 331-extending drive fixing cylinder, 332- Outward drive sliding cylinder, 333-outward drive rod, 34-exhaust gas centralized filter box, 35-solvent storage box, 351-solvent delivery pump, 36-solvent heating furnace, 37-solvent vapor delivery pump, 40-backfill mechanism, 41-backfill mechanism support plate, 410-backfill connection through hole, 42-backfill support shaft, 43-backfill guide constraint plate, 44-backfill steering mechanism, 441-steering drive housing, 442-steering drive worm gear, 443-steering drive motor, 444-steering drive worm, 51-positive pressure riser Lowering mechanism, 511-positive pressure lifting fixed inner shell, 512-positive pressure lifting sliding outer shell, 513-positive pressure lifting connecting frame, 514-positive pressure lifting driving rod, 52-adsorption lifting mechanism, 521-adsorption lifting fixed inner shell, 522-adsorption lifting sliding outer shell, 523-adsorption lifting connecting frame, 524-adsorption lifting driving rod, 53-steering connecting mechanism, 531-first steering connecting seat, 532-steering connecting shaft, 533-second steering connecting seat, 5330-steering connecting hole, 534-steering driving rod. DETAILED DESCRIPTION

[0058] The following combination Figures 1-12 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 each main view or structural schematic diagram itself.

[0059] Example 1:

[0060] An in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar, such as Figure 1 As shown, it includes a vehicle-mounted driving structure 10, a grooving mechanism 20 and a biochar adsorption mechanism 30 provided on the vehicle-mounted driving structure 10;

[0061] like Figure 1 、 Figure 2 As shown, the vehicle-mounted driving structure 10 includes a vehicle-mounted support plate 11 and a plurality of crawler-type driving wheel sets 12 connected to the bottom of the vehicle-mounted support plate 11;

[0062] The crawler drive wheel set 12 is a crawler drive wheel set driven by a motor in the prior art;

[0063] The grooving mechanism 20 includes a sprocket support frame 21 connected to the side of the vehicle support plate 11, two grooving drive sprockets 22 rotatably connected to the sprocket support frame 21, a grooving drive chain 23 is transmission-connected between the two grooving drive sprockets 22, and a plurality of grooving buckets 24 are fixed to the outside of the grooving drive chain 23;

[0064] like Figure 6 、 Figure 7 As shown, the sprocket support frame 21 includes an upper sprocket support frame 211 and a lower sprocket support frame 212 fixed to the lower end of the upper sprocket support frame 211, an upper sprocket rotating shaft 2110 is fixed on the upper sprocket support frame 211, and a lower sprocket rotating shaft 2120 is fixed on the lower sprocket support frame 212, one of the grooved drive sprockets 22 is rotatably connected to the upper sprocket rotating shaft 2110, and the other grooved drive sprocket 22 is rotatably connected to the lower sprocket rotating shaft 2120, the two grooved drive sprockets 22 are arranged in the vertical direction, and the two grooved drive sprockets 22 are in the same vertical plane.

[0065] like Figure 2 As shown, the sprocket upper support frame 211 is connected to the vehicle support plate 11 through a groove lifting mechanism 25. The groove lifting mechanism 25 includes a groove lifting fixed cylinder 251 fixed to the top of the vehicle support plate 11 and with an opening facing upward. The outer side of the groove lifting fixed cylinder 251 is slidably connected to a groove lifting movable cylinder 252 with an opening facing downward. The sprocket upper support frame 211 is fixedly connected to the outer side of the groove lifting movable cylinder 252.

[0066] A groove lifting drive rod 253 for driving the groove lifting movable cylinder 252 to lift and move is provided in the groove lifting fixed cylinder 251. The groove lifting drive rod 253 is an electrically controlled telescopic rod of the prior art. The outer rod end of the groove lifting drive rod 253 is fixedly connected to the bottom of the groove lifting fixed cylinder 251, and the inner rod end of the groove lifting drive rod 253 is fixedly connected to the top of the groove lifting movable cylinder 252.

[0067] like Figure 3 As shown, the biochar adsorption mechanism 30 includes a positive pressure circulation mechanism 31 connected to the top of the vehicle support plate 11 through a positive pressure lifting mechanism 51;

[0068] The positive pressure circulation mechanism 31 includes a positive pressure circulation support square shell 311 with two through-holes. The two open ends of the positive pressure circulation support square shell 311 are slidably connected to a positive pressure circulation close shell 312 with openings facing each other. A partition support plate 313 is fixed in the positive pressure circulation support square shell 311, and multiple positive pressure steam nozzles 310 are fixed to the side of the partition support plate 313.

[0069] The positive pressure flow is close to the side wall of the housing 312 and is a porous hollow structure;

[0070] like Figure 3 As shown, the positive pressure flow close to the housing 312 is driven to slide by the outward extension close mechanism 33 provided on the side of the partition support plate 313, as shown in FIG. Figure 8 As shown, the outward extension close mechanism 33 includes an outward extension drive fixed cylinder 331 fixed to the side of the partition support plate 313, an outward extension drive sliding cylinder 332 is slidably connected to the outward extension drive fixed cylinder 331, and the outer end of the outward extension drive sliding cylinder 332 is fixedly connected to the positive pressure flow close housing 312;

[0071] An outward drive rod 333 for driving the outward drive sliding cylinder 332 to move is provided in the outward drive fixed cylinder 331. The outward drive rod 333 is an electrically controlled telescopic rod of the prior art. The outer rod end of the outward drive rod 333 is fixedly connected to the outward drive fixed cylinder 331, and the inner rod end of the outward drive rod 333 is fixedly connected to the outward drive sliding cylinder 332.

[0072] like Figure 4 As shown, the vehicle-mounted support plate 11 has a vertically penetrating positive pressure lifting hole 510, as shown in FIG. Figure 3 As shown, the positive pressure lifting mechanism 51 includes a positive pressure lifting fixed inner shell 511 fixed to the top of the vehicle support plate 11 at the positive pressure lifting through hole 510 and with an opening facing upward. A positive pressure lifting sliding outer shell 512 with an opening facing upward is slidably connected to the outer side of the positive pressure lifting fixed inner shell 511. The positive pressure lifting sliding outer shell 512 is fixedly connected to the top of the positive pressure circulation support square shell 311 through a positive pressure lifting connecting frame 513. The positive pressure circulation support square shell 311 is arranged directly below the positive pressure lifting through hole 510.

[0073] A positive pressure lift drive rod 514 is provided in the positive pressure lift fixed inner shell 511 for driving the positive pressure lift sliding outer shell 512 to move up and down. The positive pressure lift drive rod 514 is an electrically controlled telescopic rod of the prior art. The outer rod end of the positive pressure lift drive rod 514 is fixedly connected to the bottom of the positive pressure lift fixed inner shell 511, and the inner rod end of the positive pressure lift drive rod 514 is fixedly connected to the top of the positive pressure lift sliding outer shell 512.

[0074] There is a partial gap near the top of the positive pressure circulation shell 312 so that the lower end of the positive pressure lifting connecting frame 513 can be fixedly connected to the top of the positive pressure circulation supporting square shell 311.

[0075] like Figure 3 As shown, the side of the vehicle support plate 11 is connected to the split module adsorption mechanism 32 through the adsorption lifting mechanism 52, as shown in FIG. Figure 9 As shown, the split module adsorption mechanism 32 includes a split adsorption shell 321. A plurality of module adsorption accommodating shells 322 are closely fixed on the side wall of the split adsorption shell 321 near the positive pressure circulation support square shell 311. The side wall of the split adsorption shell 321 has a plurality of adsorption input through holes 3210 connected to the interior of the module adsorption accommodating shell 322.

[0076] A plurality of adsorption carrier accommodating shells 323 are fixed in the module adsorption accommodating shell 322;

[0077] The adsorption carrier accommodating shell 323 is a shell structure with hollow interior and exterior. The adsorption carrier accommodating shell 323 is filled with iron-modified biochar, which is commercially available iron-modified biochar in the prior art.

[0078] An exhaust gas converging and conveying shell 324 is fixed to the other side of the module adsorption accommodating shell 322. The side wall of the module adsorption accommodating shell 322 has multiple adsorption output through holes 3220 connected to the exhaust gas converging and conveying shell 324. An exhaust gas converging and conveying pipe 325 connected to the interior of the exhaust gas converging and conveying shell 324 is fixed to the outside of the exhaust gas converging and conveying shell 324.

[0079] like Figure 3 As shown, the adsorption lifting mechanism 52 includes an adsorption lifting fixed inner shell 521 fixed at the top side edge of the vehicle support plate 11 and with an opening facing upward. The outer side of the adsorption lifting fixed inner shell 521 is slidably connected to an adsorption lifting sliding outer shell 522 with an opening facing downward. The adsorption lifting sliding outer shell 522 is fixedly connected to the top of the split adsorption shell 321 through an adsorption lifting connecting frame 523.

[0080] An adsorption lifting fixed inner shell 521 is provided with an adsorption lifting drive rod 524 for driving the adsorption lifting sliding outer shell 522 to lift and move. The adsorption lifting drive rod 524 is an electrically controlled telescopic rod in the prior art. The outer rod end of the adsorption lifting drive rod 524 is fixedly connected to the bottom of the adsorption lifting fixed inner shell 521, and the inner rod end of the adsorption lifting drive rod 524 is fixedly connected to the top of the adsorption lifting sliding outer shell 522.

[0081] like Figure 4 As shown, a plurality of exhaust gas concentration filter boxes 34 are fixed on the top of the vehicle support plate 11, and each exhaust gas collection and delivery pipe 325 is connected to the exhaust gas concentration filter box 34. The exhaust gas concentration filter box 34 is connected to the input end of an exhaust pump through a pipeline, and the exhaust pump is used to vacuum the inside of the exhaust gas concentration filter box 34.

[0082] A plurality of solvent storage boxes 35 are fixed on the top of the vehicle support plate 11, and a solvent delivery pump 351 is provided in the solvent storage box 35;

[0083] The solvent delivery pump 351 is a liquid delivery pump in the prior art;

[0084] A solvent heating furnace 36 and a solvent vapor delivery pump 37 are fixed on the top of the vehicle support plate 11. The output end of the solvent delivery pump 351 is connected to the input end of the solvent heating furnace 36 through a pipeline. The steam output pipe of the solvent heating furnace 36 is connected to the input end of the solvent vapor delivery pump 37. The output end of the solvent vapor delivery pump 37 is connected to each positive pressure steam nozzle 310 through a pipeline.

[0085] The solvent heating furnace 36 is a liquid heating furnace in the prior art, and the solvent vapor delivery pump 37 is a gas delivery pump in the prior art.

[0086] Example 2:

[0087] On the basis of Example 1, Figure 10 As shown, a backfill mechanism 40 is provided at the rear of the vehicle-mounted support plate 11. The backfill mechanism 40 includes a backfill mechanism support plate 41 connected to the vehicle-mounted support plate 11 through a steering connection mechanism 53. A plurality of crawler drive wheel sets 12 are installed at the bottom of the backfill mechanism support plate 41.

[0088] The backfill mechanism support plate 41 has a plurality of backfill connection holes 410 arranged in pairs and vertically passing therethrough. A vertically extending backfill support shaft 42 is rotatably connected in the backfill connection hole 410, and a backfill guide constraint plate 43 is fixed to the lower end of the backfill support shaft 42.

[0089] A backfill steering mechanism 44 is provided at the top of the backfill support plate 41 at the backfill support shaft 42. Figure 11 、 Figure 12As shown, the backfill steering mechanism 44 includes a steering drive accommodating shell 441 fixed on the top of the backfill mechanism support plate 41 at the backfill connecting through hole 410, the upper end of the backfill support shaft 42 extends to the interior of the steering drive accommodating shell 441, and a steering drive worm gear 442 is fixed to the upper end of the backfill support shaft 42. A steering drive motor 443 is fixed in the steering drive accommodating shell 441. The steering drive motor 443 is a servo motor in the prior art. The output shaft of the steering drive motor 443 is connected to the steering drive worm 444 through a coupling transmission, and the steering drive worm 444 is meshed with the steering drive worm gear 442.

[0090] like Figure 4 As shown, the steering connection mechanism 53 includes a first steering connection seat 531 fixed to the right end of the vehicle support plate 11, and a vertically extending steering connection shaft 532 is fixed to the first steering connection seat 531. A second steering connection seat 533 is fixed to the left end of the backfill mechanism support plate 41, and the second steering connection seat 533 has a vertically through-going steering connection hole 5330. The steering connection shaft 532 is rotatably connected to the steering connection hole 5330.

[0091] A steering drive rod 534 is provided between the right end of the vehicle support plate 11 and the left end of the backfill mechanism support plate 41. The steering drive rod 534 is a technologically advanced electrically controlled telescopic rod. The outer rod end of the steering drive rod 534 is connected to the right end of the vehicle support plate 11 in the form of a fixed hinge, and the inner rod end of the steering drive rod 534 is connected to the left end of the backfill mechanism support plate 41 in the form of a fixed hinge.

[0092] Attached with instruction manual Figure 1 To establish a spatial coordinate system for reference, set the Figure 1 The left and right directions are x-axis, and the setting instructions are attached. Figure 1 The up and down direction is the z axis, which is perpendicular to the Figure 1 The direction of the plane is the y-axis, and the positive pressure circulation supporting square shell 311 is penetrated along the y-axis direction. The rotation plane of the two slotting drive sprockets 22 in each slotting mechanism 20 is parallel to the plane where the x-axis and the z-axis are located;

[0093] A groove-cutting mechanism 20 is installed on the left end of the vehicle support plate 11 along the x-axis and on both the front and rear sides along the y-axis;

[0094] A split module adsorption mechanism 32 is installed on each of the front and rear sides of the vehicle support plate 11 along the y-axis;

[0095] The driving direction of the crawler-type driving wheel set 12 is parallel to the x-axis direction.

[0096] Assume that the length of the positive pressure circulation supporting shell 311 along the x-axis is L Z ;

[0097] In actual application, the overall operating principle of the present invention is to use the crawler drive wheel set 12 to drive the entire device to move on the ground of the area to be repaired, use three independent trenching mechanisms 20 to dig three parallel trenches along the travel direction of the entire device, use the positive pressure circulation mechanism 31 to inject high-pressure repair agent vapor into the middle trench, use the repair agent vapor to dissolve and remove Cd and As pollutants in the soil, and use the split module adsorption mechanism 32 to filter and adsorb the repair agent vapor carrying pollutants;

[0098] The grooves dug by the grooving mechanism 20 installed on the left end of the vehicle support plate 11 along the x-axis are set as the "middle groove A", and the grooves dug by the grooving mechanisms 20 installed on the front and rear sides of the vehicle support plate 11 along the y-axis are set as the "side grooves B" and "side grooves C" respectively;

[0099] In the slotting mechanism 20, the slotting drive sprocket 22 rotatably connected to the upper sprocket shaft 2110 is driven by a motor fixedly mounted on the sprocket upper support frame 211 through a gear transmission structure. The two slotting drive sprockets 22 on the same sprocket support frame 21 rotate synchronously under the drive of the slotting drive chain 23.

[0100] In the initial state, the inner rod of the trenching lifting drive rod 253 is in an extended state, and the trenching lifting moving cylinder 252 together with the entire sprocket support frame 21 is in the highest position along the vertical stroke;

[0101] During the trenching process of the trenching mechanism 20, the inner rod of the trenching lifting drive rod 253 is retracted to drive the trenching lifting movable cylinder 252 to move downward in the vertical direction. The trenching lifting movable cylinder 252 drives the entire sprocket support frame 21, the two trenching drive sprockets 22 and the trenching drive chain 23 to move downward together, and the soil is excavated by using the multiple trenching buckets 24 that move together with the trenching drive chain 23.

[0102] When the entire sprocket support frame 21 is at the lowest point of its vertical travel, the crawler drive wheel set 12 is used to drive the entire equipment to move, so that the three digging mechanisms 20 dig out continuous "middle groove A", "side groove B" and "side groove C" respectively;

[0103] Crawler drive wheel set 12 drives the entire equipment to travel every L Z After the distance is reached, the contaminated soil is adsorbed and purified by the biochar adsorption mechanism 30 during the pause.

[0104] In the initial state, the inner rod of the positive pressure lifting drive rod 514 is in an extended state, so that the positive pressure lifting sliding housing 512 drives the entire positive pressure circulation mechanism 31 to the highest position along the vertical stroke through the positive pressure lifting connecting frame 513;

[0105] The inner rod of the positive pressure lift driving rod 514 retracts, driving the positive pressure lift sliding housing 512 to move downward in the vertical direction. The positive pressure lift sliding housing 512 drives the positive pressure circulation support square housing 311 to move downward through the positive pressure lift connecting frame 513 and extend into the "middle groove A";

[0106] Driven by the outward-extending approach mechanism 33, the two positive-pressure circulation approach housings 312 move away from each other and press against the side walls of the "middle groove A" respectively. The inner rod of the outward-extending drive rod 333 extends, driving the outward-extending drive slide cylinder 332 and the positive-pressure circulation approach housing 312 to move along the through-going direction of the positive-pressure circulation support square shell 311, so that the two positive-pressure circulation approach housings 312 move away from each other and press against the side walls of the "middle groove A" respectively.

[0107] The solvent storage box 35 is filled with a citric acid aqueous solution with a mass concentration of 5%. The solvent delivery pump 351 is used to deliver the citric acid aqueous solution to the solvent heating furnace 36. The solvent heating furnace 36 heats the citric acid aqueous solution to turn it into "citric acid aqueous solution vapor". The solvent vapor delivery pump 37 then delivers the "citric acid aqueous solution vapor" to each positive pressure steam nozzle 310. The positive pressure steam nozzle 310 sprays the "citric acid aqueous solution vapor" into the positive pressure circulation close shell 312. The side wall of the positive pressure circulation close shell 312 is a porous hollow structure. The "citric acid aqueous solution vapor" in the positive pressure circulation close shell 312 will pass through the side wall of the positive pressure circulation close shell 312 and enter the soil. The "citric acid aqueous solution vapor" that has entered the soil will migrate toward the "side groove B" and "side groove C" close to both sides.

[0108] When the "citric acid aqueous solution vapor" passes through the soil between the "middle trench A" and the "side trench B" and between the "middle trench A" and the "side trench C", it will dissolve the Cd and As remaining in the soil. When the "citric acid aqueous solution vapor" carrying Cd and As elements migrates to the "side trench B" and "side trench C",

[0109] In the initial state, the inner rod of the adsorption lifting driving rod 524 is in an extended state, so that the adsorption lifting sliding housing 522 drives the entire split module adsorption mechanism 32 to the highest position along the vertical stroke through the adsorption lifting connecting frame 523;

[0110] The inner rod of the adsorption lifting drive rod 524 retracts, driving the adsorption lifting sliding housing 522 to move downward in the vertical direction. The adsorption lifting sliding housing 522 drives the split adsorption housing 321 to move downward together through the adsorption lifting connecting frame 523, so that the split adsorption housings 321 installed in the split module adsorption mechanisms 32 on the front and rear sides of the vehicle support plate 11 along the y-axis are extended into the "side groove B" and "side groove C" respectively;

[0111] The interior of the exhaust gas centralized filter box 34 is vacuumed by a vacuum pump. The exhaust gas centralized filter box 34 is connected to the interior of the split adsorption shell 321 and the interior of each module adsorption containment shell 322 through the exhaust gas converging and conveying pipe 325. Under the action of negative pressure, the "citric acid aqueous solution vapor" carrying Cd and As elements will enter the interior of each module adsorption containment shell 322 through the adsorption input through-hole 3210 on the side wall of the split adsorption shell 321. The "citric acid aqueous solution vapor" carrying Cd and As elements then passes through each adsorption carrier containment shell 323. The Cd and As in the "citric acid aqueous solution vapor" carrying Cd and As elements are adsorbed and removed by the iron-modified biochar filled in the adsorption carrier containment shell 323.

[0112] The "citric acid aqueous solution vapor" that passes through each adsorption carrier housing 323 then enters the exhaust gas collection and delivery housing 324 through the adsorption output through-hole 3220, and is transported along the exhaust gas collection and delivery pipe 325 to the exhaust gas centralized filter box 34. After being filtered by the filter element in the exhaust gas centralized filter box 34, the "citric acid aqueous solution vapor" is discharged into the atmosphere.

[0113] During the entire process of the equipment moving, the soil generated by excavating the "middle trench A", "side trench B" and "side trench C" is backfilled into each trench using the backfill mechanism 40;

[0114] Taking the "middle trench A" as an example, the backfill diversion constraint plates 43 corresponding to the "middle trench A" are arranged in pairs. The end of the backfill diversion constraint plate 43 close to the vehicle support plate 11 is away from the "middle trench A", and the other end of the backfill diversion constraint plate 43 is close to the "middle trench A". The two backfill diversion constraint plates 43 arranged in pairs are arranged in a triangular shape. By utilizing the diversion and constraint effect of the backfill diversion constraint plates 43, the soil generated by excavation and accumulated on the surface can be backfilled into the "middle trench A". The same applies to the "side trenches B" and "side trenches C".

[0115] The deflection of the backfill guide constraint plate 43 is controlled by the backfill steering mechanism 44. The output shaft of the steering drive motor 443 drives the steering drive worm 444 to rotate through the coupling, and the steering drive worm 444 drives the steering drive worm gear 442 to rotate. The steering drive worm gear 442 then drives the backfill support shaft 42 together with the backfill guide constraint plate 43 to deflect around the vertical axis of the backfill support shaft 42, thereby realizing the adjustment of the inclination angle of the backfill guide constraint plate 43.

[0116] The steering connection mechanism 53 can drive the backfill mechanism support plate 41 to deflect relative to the vehicle-mounted support plate 11 around the steering connection shaft 532, so as to control the relative position of each backfill guide constraint plate 43, so as to facilitate more accurate backfilling work. The extension or retraction of the inner rod of the steering drive rod 534 can drive the backfill mechanism support plate 41 to rotate clockwise or counterclockwise around the steering connection shaft 532, thereby controlling the position of each backfill guide constraint plate 43 relative to each "middle groove A", "side groove B" and "side groove C", so that the backfill guide constraint plates 43 arranged in pairs in a triangular arrangement are accurately located directly above the groove.

[0117] In the process of backfilling the soil produced by excavating the "middle trench A", "side trench B" and "side trench C" back into each trench by the backfilling mechanism 40, granular iron-modified biochar is filled in the "middle trench A", "side trench B" and "side trench C" at the same time, and the granular iron-modified biochar is mixed with the original soil and backfilled into each trench. The iron-modified biochar filled in each trench is used to continuously adsorb and remove the Cd and As elements remaining in the soil. Since the iron-modified biochar is only filled in the specified "middle trench A", "side trench B" and "side trench C", it is convenient to subsequently dig out the iron-modified biochar that adsorbs and carries the Cd and As elements separately and then carry out harmless treatment;

[0118] Specifically, a storage box is set on the top of the backfill mechanism support plate 41 for storing granular iron-modified biochar. At the position where the original soil backfill falls into the groove, the granular iron-modified biochar is uniformly transported to each "middle groove A", "side groove B" and "side groove C" using a screw conveyor with existing technology.

Claims

1. An in-situ remediation device for Cd-As composite contaminated soil based on iron-modified biochar, characterized in that: It comprises a vehicle-mounted drive structure (10), a grooving mechanism (20), a biochar adsorption mechanism (30), and a backfilling mechanism (40) arranged on the vehicle-mounted drive structure (10); The vehicle-mounted driving structure (10) comprises a vehicle-mounted support plate (11) and a plurality of crawler-type driving wheel sets (12) connected to the bottom of the vehicle-mounted support plate (11); The grooving mechanism (20) comprises a sprocket support frame (21) connected to the side of the vehicle-mounted support plate (11), two grooving drive sprockets (22) rotatably connected to the sprocket support frame (21), a grooving drive chain (23) being transmission-connected between the two grooving drive sprockets (22), and a plurality of grooving buckets (24) being fixed to the outside of the grooving drive chain (23); The biochar adsorption mechanism (30) includes a positive pressure circulation mechanism (31) connected to the top of the vehicle-mounted support plate (11) via a positive pressure lifting mechanism (51); The positive pressure circulation mechanism (31) comprises a positive pressure circulation support square shell (311) with two through-holes, the two open ends of the positive pressure circulation support square shell (311) are respectively slidably connected to a positive pressure circulation close shell (312) with openings facing each other, a partition support plate (313) is fixed in the positive pressure circulation support square shell (311), and a plurality of positive pressure steam nozzles (310) are fixed on the side of the partition support plate (313); The side of the vehicle-mounted support plate (11) is connected to a split module adsorption mechanism (32) via an adsorption lifting mechanism (52), and the split module adsorption mechanism (32) comprises a split adsorption shell (321), a plurality of module adsorption accommodating shells (322) fixed in the split adsorption shell (321), and a plurality of adsorption carrier accommodating shells (323) fixed in the module adsorption accommodating shell (322); The positive pressure circulation close housing (312) is driven to slide by an outward-extending close mechanism (33) provided on the side of the partition support plate (313), the outward-extending close mechanism (33) comprising an outward-extending drive fixed cylinder (331) fixed on the side of the partition support plate (313), an outward-extending drive sliding cylinder (332) being slidably connected in the outward-extending drive fixed cylinder (331), and an outer end of the outward-extending drive sliding cylinder (332) being fixedly connected to the positive pressure circulation close housing (312); An outward drive rod (333) for driving the outward drive sliding cylinder (332) to move is provided in the outward drive fixed cylinder (331).

2. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1 is characterized in that: The sprocket support frame (21) comprises an upper sprocket support frame (211) and a lower sprocket support frame (212) fixed to the lower end of the upper sprocket support frame (211); an upper sprocket rotating shaft (2110) is fixed to the upper sprocket support frame (211); and a lower sprocket rotating shaft (2120) is fixed to the lower sprocket support frame (212); one of the grooved drive sprockets (22) is rotatably connected to the upper sprocket rotating shaft (2110), and the other grooved drive sprocket (22) is rotatably connected to the lower sprocket rotating shaft (2120); the two grooved drive sprockets (22) are arranged in a vertical direction, and the two grooved drive sprockets (22) are located in the same vertical plane.

3. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1 is characterized in that: The sprocket upper support frame (211) is connected to the vehicle-mounted support plate (11) via a slotting lifting mechanism (25), wherein the slotting lifting mechanism (25) comprises a slotting lifting fixed cylinder (251) fixed to the top of the vehicle-mounted support plate (11) and with an opening facing upward, a slotting lifting movable cylinder (252) with an opening facing downward is slidably connected to the outer side of the slotting lifting fixed cylinder (251), and the sprocket upper support frame (211) is fixedly connected to the outer side of the slotting lifting movable cylinder (252); A grooving lifting drive rod (253) for driving the grooving lifting movable cylinder (252) to move upward and downward is provided in the grooving lifting fixed cylinder (251).

4. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1, characterized in that: The vehicle-mounted support plate (11) is provided with a vertically penetrating positive pressure lifting through hole (510), the positive pressure lifting mechanism (51) comprises a positive pressure lifting fixed inner shell (511) fixed to the top of the vehicle-mounted support plate (11) at the positive pressure lifting through hole (510) and with an opening facing upwards, a positive pressure lifting sliding outer shell (512) with an opening facing upwards is slidably connected to the outer side of the positive pressure lifting fixed inner shell (511), the positive pressure lifting sliding outer shell (512) is fixedly connected to the top of the positive pressure circulation support square shell (311) via a positive pressure lifting connecting frame (513), and the positive pressure circulation support square shell (311) is arranged directly below the positive pressure lifting through hole (510); A positive pressure lifting drive rod (514) for driving the positive pressure lifting sliding outer shell (512) to move upward and downward is provided in the positive pressure lifting fixed inner shell (511).

5. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1, characterized in that: The module adsorption accommodating shell (322) is closely fixed on the side wall of the split adsorption shell (321) near the positive pressure circulation supporting square shell (311), and the side wall of the split adsorption shell (321) has a plurality of adsorption input through holes (3210) connected to the interior of the module adsorption accommodating shell (322); An exhaust gas converging and conveying shell (324) is fixed to the other side of the module adsorption accommodating shell (322); a plurality of adsorption output through-holes (3220) communicating with the exhaust gas converging and conveying shell (324) are provided on the side wall of the module adsorption accommodating shell (322); an exhaust gas converging and conveying pipe (325) communicating with the interior of the exhaust gas converging and conveying shell (324) is fixed to the outside of the exhaust gas converging and conveying shell (324); The adsorption lifting mechanism (52) comprises an adsorption lifting fixed inner shell (521) fixed at the top side edge of the vehicle-mounted support plate (11) and with an opening facing upwards, an adsorption lifting sliding outer shell (522) with an opening facing downwards being slidably connected to the outer side of the adsorption lifting fixed inner shell (521), and the adsorption lifting sliding outer shell (522) being fixedly connected to the top of the split adsorption outer shell (321) via an adsorption lifting connecting frame (523); An adsorption lifting fixed inner shell (521) is provided with an adsorption lifting driving rod (524) for driving the adsorption lifting sliding outer shell (522) to move upward and downward.

6. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 5, characterized in that: A plurality of exhaust gas concentration filter boxes (34) are fixed on the top of the vehicle-mounted support plate (11), and each of the exhaust gas collection and delivery pipes (325) is connected to the exhaust gas concentration filter box (34). The exhaust gas concentration filter box (34) is connected to the input end of an exhaust pump through a pipe, and the exhaust pump is used to vacuum the interior of the exhaust gas concentration filter box (34).

7. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1, characterized in that: A plurality of solvent storage boxes (35) are fixed on the top of the vehicle-mounted support plate (11), and a solvent delivery pump (351) is provided in the solvent storage box (35); A solvent heating furnace (36) and a solvent vapor delivery pump (37) are fixed on the top of the vehicle-mounted support plate (11); the output end of the solvent delivery pump (351) is connected to the input end of the solvent heating furnace (36) through a pipeline; the steam output pipe of the solvent heating furnace (36) is connected to the input end of the solvent vapor delivery pump (37); and the output end of the solvent vapor delivery pump (37) is connected to each of the positive pressure steam nozzles (310) through a pipeline.

8. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 1, characterized in that: The backfilling mechanism (40) comprises a backfilling mechanism support plate (41) connected to the vehicle-mounted support plate (11) via a steering connection mechanism (53), and a plurality of the crawler-type drive wheel sets (12) are mounted on the bottom of the backfilling mechanism support plate (41); The backfill mechanism support plate (41) has a plurality of backfill connection holes (410) arranged in pairs and vertically penetrating therethrough. A vertically extending backfill support shaft (42) is rotatably connected in the backfill connection hole (410), and a backfill guide constraint plate (43) is fixed to the lower end of the backfill support shaft (42). A backfill steering mechanism (44) is provided at the top of the backfill mechanism support plate (41) at the backfill support shaft (42). The backfill steering mechanism (44) includes a steering drive accommodating shell (441) fixed at the top of the backfill mechanism support plate (41) at the backfill connection through hole (410). The upper end of the backfill support shaft (42) extends into the interior of the steering drive accommodating shell (441). A steering drive worm gear (442) is fixed at the upper end of the backfill support shaft (42). A steering drive motor (443) is fixed in the steering drive accommodating shell (441). The output shaft of the steering drive motor (443) is connected to a steering drive worm gear (444) through a coupling transmission. The steering drive worm gear (444) is meshed with the steering drive worm gear (442).

9. The in-situ remediation equipment for Cd-As composite contaminated soil based on iron-modified biochar according to claim 8, characterized in that: The steering connection mechanism (53) comprises a first steering connection seat (531) fixed to the right end of the vehicle-mounted support plate (11), a vertically extending steering connection shaft (532) being fixed to the first steering connection seat (531), a second steering connection seat (533) being fixed to the left end of the backfill mechanism support plate (41), the second steering connection seat (533) having a vertically penetrating steering connection hole (5330), and the steering connection shaft (532) being rotatably connected to the steering connection hole (5330); A steering drive rod (534) is provided between the right end of the vehicle-mounted support plate (11) and the left end of the backfill mechanism support plate (41).

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