WO2021093235A1

WO2021093235A1 - External field repair device for heavy metal contaminated soil

Info

Publication number: WO2021093235A1
Application number: PCT/CN2020/079219
Authority: WO
Inventors: 高莹; 孙英杰
Original assignee: 青岛理工大学
Priority date: 2019-11-14
Filing date: 2020-03-13
Publication date: 2021-05-20
Also published as: CN110773560B; CN110773560A

Abstract

An external field repair device for heavy metal contaminated soil, comprising: a treatment pool (52); a stirring device, which is mounted in the treatment pool and comprises a fixing frame (24), a guide block (23) mounted on a frame, and three push-pull rods (8) at the top, in the middle and at the bottom of the frame, the push-pull rods pass through the guide block, and each push-pull rod is installed with a number of stirring rods (44) perpendicular thereto; a driving device, which is used to drive the push-pull rods to move horizontally along the guide block; a screening device; and a spray device, which lifts the liquid at the bottom of the treatment pool to the top of the treatment pool and sprays it to the treatment pool through a sprayer (18). The device can realize horizontal counter-mixing in actual engineering, and is especially suitable for solid-liquid mixed state and solid substances such as heavy metal contaminated soil, the counter-mixing is more uniform and the treatment effect is better. The device as a whole is detachable, which is convenient for cleaning and washing the bottom of the treatment pool, and the operation is simple and the washing cost is lower.

Description

An outdoor repairing device for heavy metal contaminated soil

Technical field

The invention belongs to the field of remediation of heavy metal contaminated soil, and in particular relates to an outdoor remediation device for heavy metal contaminated soil.

Background technique

The heavy metals in heavy metal polluted soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) with certain toxicity , Copper (Cu), nickel (Ni) and other elements. Excessive heavy metals can cause plant physiological dysfunction and nutritional imbalance. The enrichment coefficient of cadmium, mercury and other elements in crop seeds is relatively high. Even if they exceed food hygiene standards, they will not affect crop growth, development and yield. In addition, mercury and arsenic can weaken Inhibit the activity of nitrifying and ammonifying bacteria in the soil and affect the supply of nitrogen. When there are too many harmful substances in the soil, exceeding the self-purification capacity of the soil, it will cause changes in the composition, structure and function of the soil. The activity of microorganisms will be inhibited. The harmful substances or their decomposition products will gradually accumulate in the soil through the "soil → plant → Human body", or indirectly absorbed by the human body through "soil → water → human body", to the extent that it is harmful to human health. Heavy metal pollutants have very little mobility in the soil, are not easy to leach with water, and are not degraded by microorganisms. After entering the human body through the food chain, they have great potential harm.

The invention with application number 201710440404.6 discloses a heavy metal contaminated soil remediation device, including a kettle body, the kettle body is arranged through a fixing plate, the lower end of the fixing plate is provided with a number of support legs, the lower end of the kettle body is provided with an opening, and one side of the opening It is hinged with a sealing support plate, and the upper end of the kettle body is provided with a soil inlet and a modifier inlet; the upper side of the fixed plate is provided with a top plate through a number of support columns, and the upper side of the top plate is provided with a drive motor, and the drive shaft of the drive motor is set downwards and A rotating shaft is connected. The lower end of the rotating shaft extends to the inside of the kettle body and is connected with a number of stirring rods. The upper side of the top plate is provided with a soil input mechanism and an amendment input mechanism. The soil input mechanism and the amendment input mechanism respectively include a first belt conveyor and a second belt conveyor. For the belt conveyor, a flat plate is arranged on the upper side of the first belt conveyor, and a number of nail teeth are evenly distributed on the lower surface of the flat plate. The invention can not only accelerate the mixing speed of the soil and the amendment, but also can recover the fine metal iron particles in the soil.

The above-mentioned device adopts a kettle structure, which has high cost and large loss. The volume of the kettle body is small and the processing capacity is limited; in the case of large batch processing, the number of the kettle body is large, the cleaning workload is large, and the cleaning cost is high. Its rotating stirring mode is not uniform for solid-liquid mixing and solid materials. And there is no filtrate recovery and sprinkling system, and the microorganisms in the repaired treatment solution cannot be reused, and only new reagents can be added, which is easy to cause waste and secondary pollution, and the treatment cost increases.

Summary of the invention

The present invention proposes a heavy metal contaminated soil field remediation device with convenient cleaning, uniform mixing, and low processing cost, which is realized by adopting the following technical solutions, including: a processing tank located in the processing pit; a stirring device installed in the processing tank, including a fixed machine Rack, a guide block installed on the rack, and three upper, middle and lower push-pull rods, the push-pull rods pass through the guide block, and each push-pull rod is installed with a number of stirring rods perpendicular to it; the drive device is installed in the processing On the side wall of the pit, it is used to drive the push-pull rod to move horizontally along the guide block; the filter device is installed below the stirring device in the treatment tank, and the spray device includes sprayers arranged at intervals above the treatment tank. The liquid outlet pipe at the bottom of the tank and the pressurizing pump, when the pressurizing pump works, the liquid at the bottom of the treatment tank is lifted to the top of the treatment tank to spray to the treatment tank through the sprayer.

Further, the filter screen device includes two layers, the upper layer is a fine sieve plate, the lower layer is a coarse sieve plate, the coarse sieve plate is provided with protrusions to support the fine sieve plate, and the coarse sieve plate is opened with Several percolation holes with a diameter of 5 cm and an inclination angle of 75° are opened on the fine sieve plate with a number of percolation holes with a diameter of 3 cm and an inclination angle of 75°.

Further, the driving device includes a motor installed on the side wall of the processing pit, and a rotating wheel installed on the motor shaft, and the rotating wheel is connected to the push-pull rod through a power converter.

Further, the power steering gear includes a connecting rod, one end of the connecting rod is fixed on the runner, and the other section has a U-shaped groove. The U-shaped groove is installed with a rotatable horizontal shaft, which is rigidly connected to the push-pull rod. .

Further, the pool wall of the treatment pool is composed of a brick layer, a waterproof layer, and a reinforced concrete layer from outside to inside, and the bottom of the treatment pool is composed of a reinforced concrete layer, a waterproof layer, and a brick layer from top to bottom.

Further, the treatment pit has a length of 1000 cm, a width of 300 cm, and a depth of 200 cm, and the treatment tank has a length of 800 cm, a width of 200 cm, and a height of 180 cm.

Further, a layer of triangular reinforced concrete support blocks with a width of 5 cm is set on the inner walls of both sides of the treatment tank with a height of 30 cm, and the coarse screen is placed on the support blocks.

Further, a filter is installed at the end of the liquid outlet pipe.

Compared with the prior art, the advantages and positive effects of the present invention are:

The invention independently develops a set of engineering-level horizontal counter-mixing system. It can realize horizontal counter-mixing in actual engineering, and is especially suitable for solid-liquid mixed state and solid substances such as heavy metal contaminated soil. Counter-mixing is more uniform and the treatment effect is better.

The invention independently develops a set of detachable, double-layer filtering system. It can successfully carry out solid-liquid separation and prevent clogging. At the same time, the filter system is a detachable design, which facilitates the cleaning and cleaning of the bottom of the treatment pool, and the operation is simple and the cleaning cost is lower.

The invention independently develops a set of filtrate recovery and re-sprinkling system. The leachate collected at the bottom of the pool can be re-elevated and sprinkled onto the surface of the processing pool, and the heavy metal processing microorganisms in the processing liquid can be recycled and reused, reducing the amount of reagents added, saving costs, and being more environmentally friendly.

Description of the drawings

Figure 1 is a schematic diagram of the structure of an outdoor remediation device for heavy metal contaminated soil according to an embodiment of the present invention;

Figure 2 is a cross-sectional view of the treatment tank A-A;

Figure 3 is a top view of the treatment tank;

Figure 4 is a top view of the spray device;

Figure 5 is a top view of the stirring device;

Figure 6 is a top view of the coarse sieve plate;

Figure 7 is a top view of the fine sieve plate;

Figure 8 is a schematic diagram of the main structure of the power steering gear;

Figure 9 is a B-B sectional view of the power steering gear;

Figure 10 is a partial enlarged view of zone C of the treatment tank;

Figure 11 is a partial enlarged view of the D area of the runner;

The above figures have: pit wall 1, runner 2, fixed shaft 3, motor shaft 4, motor 5, connecting rod 6, power steering gear 7, push rod 8, fixed block 9, brick layer 10, waterproof layer 11 , Concrete layer 12, support frame 13, top beam 14, fixed buckle 15, tee 16, liquid distributor 17, sprayer 18, processing pit 19, gas-liquid interface 20, solid-liquid interface 21, guide block 22 , Guide block 23, fixed base frame 24, fine sieve plate 25, percolation hole 26, coarse sieve plate 27, percolation hole 28, interlayer area 29, protrusion 30, support block 31, foundation pillar 32, concrete layer 33, Waterproof layer 34, brick layer 35, liquid outlet pipe 36, pressure pump 37, main liquid pipe 38, branch liquid pipe 39, filter 40, pit bottom 41, sealing layer 42, sealing layer 43, stirring rod 44, horizontal The tube 45, the bearing 46, the branch 47, the Y-shaped groove 48, the fixing bolt 49, the horizontal shaft 50, the bearing 51, the treatment tank 52, the bracket 53, the three-way 54 and the eye 55.

Detailed ways

In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Figure 1, Figure 2 and Figure 3, this embodiment proposes a heavy metal contaminated soil field remediation device including a processing pit 19, a processing tank 52, a stirring device, a driving device, a filter device and a spray device.

The treatment tank 52 is located in the treatment pit 19. In this embodiment, the treatment pit 19 has a length of 1000 cm, a width of 300 cm, and a depth of 200 cm. A treatment pit 19 with a length of 800 cm and a width of 200 cm and a height of 180 cm is set in the middle of the bottom 41 of the deep pit 19 Pool 52, referring to Figure 11, the wall of the treatment tank 52 is composed of a brick layer 10, a waterproof layer 11, and a reinforced concrete layer 12 from the outside to the inside. The bottom of the treatment tank 52 is composed of a reinforced concrete layer 33 and a waterproof layer from top to bottom. 34. The brick layer 35 consists of the brick layer 10 and the brick layer 35 each having a thickness of 25cm, the waterproof layer 11 and the waterproof layer 34 both having a thickness of 5cm, and the reinforced concrete layer 12 and the reinforced concrete layer 33 have both thicknesses. It is 10 cm, the brick layer 10 and the brick layer 35, the waterproof layer 11 and the waterproof layer 34, and the reinforced concrete layer 12 and the reinforced concrete layer 33 are exactly corresponding and seamlessly connected. A series of reinforced concrete foundation pillars 32 with a length of 15cm, a width of 15cm and a height of 30cm are set at the bottom of the treatment tank 52, and the distance between two adjacent reinforced concrete foundation columns 32 is 100cm; the reinforced concrete layer on both sides of the treatment tank 52 is 12 high A layer of triangular reinforced concrete support blocks 31 with a width of 5 cm is set at 30 cm.

6 and 7, the filter device includes a coarse sieve plate 27 and a fine sieve plate 25. In this embodiment, a steel coarse sieve plate 27 with a length of 760 cm and a width of 160 cm and a thickness of 2 cm is placed in the treatment tank 52. The coarse sieve plate 27 is just right. Supported by the support block 31 and the base column 32, the coarse sieve 27 can be freely taken out of the treatment tank 52; the coarse sieve 27 is provided with a percolation hole 28 with a diameter of 5 cm and an inclination angle of 75°, and two adjacent percolation holes The spacing between 28 is 5cm; a series of steel protrusions 30 with a length of 3cm, a width of 3cm and a height of 4cm are arranged on the top surface of the coarse screen 27, and the spacing between two adjacent protrusions 30 is 100cm; A steel fine sieve plate 25 with a length of 760 cm and a width of 160 cm and a thickness of 1.5 cm is placed on the plate 27. The fine sieve plate 25 is just supported by the protrusions 30 on the coarse sieve plate 27. The fine sieve plate 25 can be taken out freely from the treatment tank 52; The sieve plate 25 is provided with percolation holes 26 with a diameter of 3 cm and an inclination angle of 75°, and the distance between two adjacent percolation holes 26 is 3 cm; the coarse sieve plate 27 and the fine sieve plate 25 form a height 1.5 cm The mezzanine area 29; on the top surface of the fine sieve plate 25, four vertical steel fixed base frames 24 with a height of 120 cm are fixedly installed. The four fixed pedestals 24 form a group in pairs, respectively located on the top surface of the fine sieve plate 25 On both sides; three orifices 43 with a diameter of 1.5 cm are opened on the side wall of the treatment tank 52, of which, two orifices 43 are on one side, the remaining one orifice 43 is on one side, and the other two orifices 43 are on the same side. The heights of the holes are 70cm and 130cm respectively, and the height of the orifice 43 on one side is 100cm; the cross-section centers of the two orifices 43 on the same side are on a vertical line, and at the same time, the two orifices 43 on the same side are connected to the fine sieve plate. The two fixed base frames 24 on the same side on the 25 are on the same plane, and the aperture 43 on a single side is on the same plane as the two fixed base frames 24 on the same side on the fine screen 25; A rubber sealing block 22 with a diameter of 5 cm and a thickness of 3 cm is fixed at the opening 43.

Referring to Figure 5, the stirring device is installed in the treatment tank. In this embodiment, a steel fixed block 9 with a diameter of 10 cm and a thickness of 5 cm is fixed at all the orifices 43 on the outer wall of the treatment tank 52. The fixed block 9 and the sealing block 22 are located at the center of the circle. A hole with a diameter of 1cm is reserved; three steel push rods 8 with a length of 800cm and a diameter of 1cm are set, and a push rod 8 is placed in each hole 43. The push rod 8 can be at the center of the fixed block 9 and the sealing block 22 Free horizontal movement in the reserved gap; a steel guide block 23 with a diameter of 3cm and a thickness of 2cm is set on the fixed base frame 24, and a hole with a diameter of 1cm is reserved at the center of the guide block 23, and the push rod 8 is fixed by the guide block 23 On the fixed base frame 24, the push rod 8 can freely move horizontally in the gap reserved at the center of the guide block 23, and each push rod 8 can freely reciprocate horizontally under the constraints of the corresponding fixed block 9 and the guide block 23 Movement; A series of steel stirring rods 44 with a length of 80cm and a diameter of 1cm are set on each pushing rod 8. The distance between two adjacent stirring rods 44 is 30cm. All stirring rods on the same pushing rod 8 44 are all located on the same horizontal surface, and the setting positions of the guide block 23 and the stirring rod 44 do not affect the horizontal free reciprocating movement of the pushing rod 8. The horizontal counter-mixing system can realize horizontal counter-mixing in actual projects. It is especially suitable for solid-liquid mixing and solid substances such as heavy metal contaminated soil. The counter-mixing is more uniform and the treatment effect is better.

The driving device is used to drive the push-pull rod to move horizontally along the guide block. In this embodiment, all the ends of the push rod 8 outside the treatment tank 52 are connected by a power steering gear 7. With reference to Figures 8 and 9, the power steering gear 7 includes a steel connecting rod 6 with a length of 30 cm and a diameter of 1 cm, a U-shaped groove 48, a fixing bolt 49, a horizontal shaft 50, a bearing 51 and a hole 55, and a steel connecting rod 6 with a diameter of 1 cm. A steel Y-shaped groove 48 with a length of 4 cm, a width of 2 cm and a height of 5 cm is set on the upper rigidity. A pair of holes 55 with a diameter of 1.2 cm are arranged at the end of the U-shaped groove 48. Each hole 55 is provided with an outer diameter of 1.2 cm and an inner diameter of 0.7 cm. Bearing 51, a steel horizontal shaft 50 with a diameter of 0.7 cm and a length of 6 cm is installed in the bearing 51. The two ends of the horizontal shaft 50 are fixed by a fixing bolt 49. The horizontal shaft 50 is placed to slide in the bearing 51 from the Y-shaped groove 48 The horizontal shaft 50 is rigidly connected with the push rod 8 in the direction of the opening. In this embodiment, a steel runner 2 with a diameter of 15 cm and a thickness of 1.5 cm is set at each upper connecting rod 6. Referring to Fig. 11, a steel runner 2 with a diameter of 0.8 cm and a height of 2 cm is set at the edge of each runner 2 Fix the shaft 3, install a bearing 46 with an inner diameter of 0.8cm and an outer diameter of 1.5cm on the fixed shaft 3. The bearing 46 is rigidly connected with the connecting rod 6; the inner wall of the deep pit 19 at the position of each runner 2 passes through a steel bracket 53. A motor 5 with a length of 10cm, a width of 10cm and a height of 10cm is fixedly installed. The motor shaft 4 of the motor 5 is rigidly connected with the center of the runner 2; when the motor 5 rotates, the motor shaft 4 drives the runner 2 to rotate, and the runner 2 drives The pushing rod 8 performs horizontal free reciprocating motion under the constraints of the fixed block 9 and the guide block 23, thereby driving the horizontal free reciprocating motion of the stirring rod 44, thereby achieving the effect of mixing.

Referring to Figure 4, the spray device includes a sprayer and a pressure pump. In this embodiment, four steel support frames 13 with a height of 30 cm and a diameter of 1 cm are set on the top concrete layer 12 on both short sides of the treatment tank 52, and the distance between two adjacent support frames 13 on the concrete layer 12 on the same side is 40cm; four hollow steel roof beams 14 with a length of 800cm and a diameter of 5cm are arranged on the top of the treatment tank 52 along the longitudinal direction, and the top beams 14 are respectively fixed to the support brackets 13 on the short sides of the treatment tank 52; distance from the bottom of the treatment tank 52 A rubber outlet pipe 36 with a diameter of 10cm is set at the bottom 12cm. The outlet pipe 36 penetrates the brick layer 10, the waterproof layer 11, and the reinforced concrete layer 12 and extends from the inside of the treatment tank 52 to the outside. The masonry layer 10, the waterproof layer 11, and the reinforced concrete layer 12 are waterproofed and sealed by a sealing layer 42; a filter 40 with a diameter of 12 cm is installed at one end of the liquid outlet pipe 36 inside the treatment tank 52 to filter impurities; One end of the liquid outlet pipe 36 inside the treatment tank 52 is connected to the inlet end of a pressure pump 37 with a length of 30 cm, a width of 30 cm and a height of 30 cm, and a vertical main liquid pipe 38 with a diameter of 10 cm is installed at the outlet end of the pressure pump 37. The end of the main liquid pipe 38 is connected to a horizontal horizontal pipe 45 with a diameter of 10 cm and a length of 120 cm through a three-way connector 54. The horizontal horizontal pipe 45 is divided into four branch pipes 39 with a diameter of 8 cm through a branch 47. The four branch pipes 39 are respectively Parallel to the four top beams 14, the branch pipe 39 is fixed on the corresponding top beam 14 with the fixing buckle 15; each branch pipe 39 is divided into a series of 5cm in diameter and 5cm in length by a three-way device 16 The distance between the two adjacent pipes 17 on the same branch pipe 39 is 100 cm; a sprayer 18 with a diameter of 10 cm is installed at the end of each pipe 17 for spraying liquid.

When the heavy metal contaminated soil is repaired in the field, the soil to be repaired is filled into the treatment tank 52, and treatment chemicals, microorganisms and water are added to form a gas-liquid interface 20 and a solid-liquid interface 21 in the treatment pool 52. The gas-liquid interface 20 can prevent air from entering the treatment tank 52 to serve as a water seal and create a relatively anaerobic environment for the reaction under the solid-liquid interface 21; start the motor 4, the booster pump 37, and the motor 4 Drive the stirring rod 44 to reciprocate horizontally to achieve the effect of anaerobic stirring and mixing; the treatment agent and the microbial leachate sequentially pass through the percolation hole 26, the interlayer area 29 and the percolation hole 28 into the bottom of the treatment tank 52, and then pass through the filter 40. The liquid outlet pipe 36, the pressurizing pump 37, and the main liquid pipe 38 reach the branch liquid pipe 39 at the top of the treatment tank 52, and then are evenly sprayed on the gas-liquid interface 20 in the treatment tank 52 through the liquid distribution pipe 17 and the sprayer 18, Carry out cyclic reaction treatment, and finally complete the field remediation of heavy metal contaminated soil. After the field remediation of heavy metal contaminated soil is completed, remove the anaerobic mixing device such as the push rod 8 and the fixed base frame 24 of the treatment tank 52, remove the reconditioned soil in the treatment tank 52, and repeat the next round of field remediation of heavy metal contaminated soil .

When cleaning the treatment tank 52, remove the anaerobic stirring device such as the push rod 8 and the fixed base frame 24 of the treatment tank 52, remove the fine sieve plate 25 and the coarse sieve plate 27 in turn to clean the treatment tank 52 After cleaning, install coarse sieve plate 27, fine sieve plate 25, fixed base frame 24, push rod 8 and other anaerobic mixing devices in sequence to carry out a new round of heavy metal contaminated soil field repair operations.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person familiar with the profession may use the technical content disclosed above to change or modify the equivalent of equivalent changes. The embodiments are applied to other fields, but any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention still fall within the protection scope of the technical solutions of the present invention.

Claims

An outdoor remediation device for heavy metal contaminated soil, which is characterized in that it comprises:

Treatment tank, located in the treatment pit;

The mixing device is installed in the treatment tank, and includes a fixed frame, a guide block installed on the frame, and three upper, middle and lower push-pull rods. The push-pull rod passes through the guide block, and each push-pull rod is installed perpendicular to it. A number of stirring sticks;

The driving device is installed on the side wall of the processing pit to drive the push-pull rod to move horizontally along the guide block; the filter device is installed under the stirring device in the processing tank;

The spray device includes a sprayer arranged at intervals above the treatment tank, a liquid outlet pipe at the bottom of the treatment tank, and a pressurizing pump. When the pressurizing pump works, the liquid at the bottom of the treatment tank is lifted to the treatment tank The top is sprayed to the treatment tank through the sprayer.
The heavy metal contaminated soil field remediation device according to claim 1, characterized in that the filter device comprises two layers, the upper layer is a fine sieve plate, the lower layer is a coarse sieve plate, and the coarse sieve plate is provided with protrusions for To support the fine sieve plate, a plurality of percolation holes with a diameter of 5 cm and an inclination angle of 75° are opened on the coarse sieve plate, and a plurality of percolation holes with a diameter of 3 cm and an inclination angle of 75° are opened on the fine sieve plate.
The heavy metal contaminated soil field remediation device according to claim 1, wherein the driving device comprises a motor installed on the side wall of the processing pit, a runner installed on the motor shaft, and the runner is powered by The converter is connected to the push-pull rod.
The heavy metal contaminated soil field remediation device according to claim 1, wherein the power steering gear includes a connecting rod, one end of the connecting rod is fixed on the runner, and the other section has a U-shaped groove, and the U-shaped groove can be installed A rotating horizontal axis, which is rigidly connected to the push-pull rod.
The field remediation device for heavy metal contaminated soil according to claim 1, characterized in that the pool wall of the treatment pool is composed of a brick layer, a waterproof layer, and a reinforced concrete layer from the outside to the inside, and the bottom of the treatment pool is from top to bottom. Reinforced concrete layer, waterproof layer, brick layer.
The heavy metal contaminated soil field remediation device according to claim 5, wherein the treatment pit is 1000 cm long, 300 cm wide, and 200 cm deep, and the treatment tank is 800 cm long, 200 cm wide, and 180 cm high.
The field remediation device for heavy metal contaminated soil according to claim 5, characterized in that a layer of triangular reinforced concrete support blocks with a width of 5 cm is set on the inner walls of both sides of the treatment tank at a height of 30 cm, and the coarse screen is placed on the support Block on.
The device for outfield remediation of heavy metal contaminated soil according to claim 7, wherein a filter is installed at the end of the outlet pipe.