Apparatus and method for repairing heavy metal contaminated soil based on humic acid leaching

Abstract

To provide a restoration apparatus and a restoration method for heavy metal contaminated soil which yield improved removal rates of As and Cd, and which are convenient to operate and have a high degree of automation.SOLUTION: A sludge outlet pipe provided on a bottom side of the vibrating screen is docked with a feeding hopper provided on a top side of the leaching barrel. A material distributing opening is provided in an inner wall of the feeding hopper. A main slot is provided in a top portion of the leaching barrel directly under the material distributing opening. A sampling bottle is slidably provided in the main slot. A restoration method includes four steps: screening (S1); distributing (S2), in which humic acid solution and soil are added into the sampling bottle; leaching (S3), in which the soil and the humic acid solution are sufficiently brought into contact with each other; and parameter adjustment (S4), in which a pH value of the humic acid solution and a solid-liquid ratio of the soil and the humic acid solution are adjusted.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of soil heavy metal pollution remediation, and specifically to a device and method for remediating heavy metal polluted soil based on humic acid elution.

Background Art

[0002] Co - pollution of heavy metals such as arsenic (As) and cadmium (Cd) in soil is not only refractory but also very complex and difficult to remove. Therefore, it has become an urgent task to research and optimize the purification method of industrial waste soil to make it suitable for reuse. . Soil elution can quickly remove heavy metal pollutants in soil and complete the treatment of polluted soil in a short period. Humic acid is a kind of organic substance generated and accumulated by the decomposition and transformation of animal and plant remains by microorganisms and a series of geochemical processes. It is an organic acid, a chelating agent, and also a surfactant, and is an ideal raw material for the preparation of soil eluents. In the soil heavy metal elution remediation process using humic acid, it is necessary to select the optimal elution conditions, carry out the whole process in a short time, and obtain high elution efficiency. Existing technologies lack an implementation device that can accurately adjust the humic acid concentration, humic acid pH, and the solid - liquid ratio of polluted soil to humic acid solution.

Summary of the Invention

[0003] In view of the above problems, the present invention provides a device and method for remediating heavy metal polluted soil based on humic acid elution. The technical solution of the present invention is as follows. The device for remediating heavy metal polluted soil based on humic acid elution is composed of a vibrating screen and an elution bucket. The mud discharge pipe provided on the bottom side of the vibrating screen is provided on the top side of the elution bucket ​ is docked with the provided salary hopper, and the mud discharge pipe is located above the salary hopper. A dispensing port is provided in the middle of the inner wall of the salary hopper on the side where the mud discharge pipe is located. A main slot is provided at the top of the elution bucket directly below the dispensing port. A sampling bottle is slidably provided inside the main slot. A main spring shaft is provided on the side of the edge of the top of the sampling bottle where the mud discharge pipe is located. Auxiliary spring shafts are symmetrically provided on both sides of the edge of the top of the sampling bottle with respect to the main spring shaft. A sealing plate for sealing and docking the opening at the top of the sampling bottle is fixedly provided on the main spring shaft. A fixing plate for fixing the sampling bottle inside the main slot is provided on the auxiliary spring shaft. Auxiliary slots for arranging the fixing plates are respectively provided on both sides of the main slot corresponding to the top of the elution bucket. A stirring motor is provided at the center of the top of the elution bucket. A stirring shaft passing through the elution bucket is provided at the bottom output end of the stirring motor. A plurality of sets of stirring rod sets are provided on the stirring shaft from top to bottom. A connecting rod is provided above the uppermost set of stirring rod sets on the stirring shaft. A rotating shaft is rotatably connected to the end of the connecting rod. A placement slot for placing the sampling bottle is provided at the end of the rotating shaft. When the sampling bottle is fixed inside the main slot, the sampling bottle is located directly above the placement slot. A gear shaft is provided on the side of the outer wall of the placement slot where the mud discharge pipe is located. The gear shaft is engaged with a gear disk provided on the inner wall of the elution bucket. The sampling bottle is made of iron and has an anti-corrosion layer on its surface. -tinged, the bottom of the inner wall of the placement slot is made of magnet, and the sampling bottle is used to fix the sampling bottle after it has fallen in, At the top of the elution bucket, an acid replenishing pipe, a deionized water replenishing pipe, an alkali liquid replenishing pipe, and a humic acid replenishing pipe are provided. As one aspect of the present invention, columns are respectively provided at the four bottom corners of the vibrating sieve, and the four columns A movable base is connected to the bottom, the elution bucket is located on the movable base, and a sand discharge pipe is provided at the bottom of one side wall of the vibrating sieve. The cross-sectional shapes of the sampling bottle, the main slot , and the placement slot are all circular. A sampling ring port is provided on the side wall of the elution bucket. When the sampling bottle moves to the position of the sampling port under the combined action of the stirring shaft and the gear shaft , the opening direction of the sampling bottle is vertically upward, and a sealing plug is provided on the inner wall of the sealing plate. By providing a movable base, the entire device can be easily moved, and by providing a sampling port, the operator can easily take out the sampling bottle. By providing a movable base, the entire device can be easily moved, and by providing a sampling port, the operator can easily take out the sampling bottle. As one aspect of the present invention, the dispensing port is opened or sealed by a sliding stopper, and fixing blocks are respectively provided on both sides of the outer wall of the feeding hopper corresponding to the dispensing port , A sliding groove is provided on the inner wall of the fixed block. Sliders are respectively provided on both sides of the sliding stopper, and the slider is slidably connected to the sliding groove in a one-to-one correspondence , A first limiting block is provided between the tops of the two fixed blocks, and a second limiting block is provided between the bottoms of the two fixed blocks. The sliding stopper is made of iron and has an anti-corrosion layer coated on the surface. The first limiting block is made of magnet, and the sliding stopper is made of iron and has an anti-corrosion layer coated on the surface. The first limiting block is made of magnet, and the sliding stopper - is used to be docked and fixed. By providing a sliding stopper, the dispensing port is opened or sealed, and together with the installation of the first limiting block, the sliding stopper and the first limiting b lock are magnetically fixed and maintained in an open state at all times. As another aspect of the present invention, an L-shaped rod is provided at a lower position corresponding to the mud discharge pipe on the top side wall of the elution bucket, and when the sampling bottle is fixed inside the main slot, the end of the L-shaped rod contacts the end of the sealing plate to open the sealing plate and a limiting rod is provided at the center of the bottom of the sliding stopper. When the sampling bottle is fixed inside the main slot, the limiting rod is positioned on one side of the sealing plate, and 600 - 800 ml of humic acid solution is put into the sampling bottle. When the soil falls into the sampling bottle and the solid-liquid ratio of the soil and the humic acid solution reaches 1 g:16 mL, the total weight of the sampling bottle reaches the weight limit of the auxiliary spring shaft, and the sampling bottle drops When the sampling bottle drops, the sealing plate rebounds under the action of the main spring shaft and collides with the limiting rod, separating the sliding stopper from the first limiting block and sliding the sliding stopper to contact the second limiting block. By providing the L-shaped rod, when the sampling bottle reaches a predetermined weight and drops, the opening is automatically sealed, and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. As one aspect of the present invention, there are 3 - 6 sets of the stirring rod sets, each set of the stirring rod sets includes 2 - 5 stirring rods, and a discharge pipe is provided on the side wall of the elution bucket. By providing the discharge pipe and when the soil falls into the sampling bottle and the solid-liquid ratio of the soil and the humic acid solution reaches 1 g:16 mL, the total weight of the sampling bottle reaches the weight limit of the auxiliary spring shaft, and the sampling bottle drops When the sampling bottle drops, the sealing plate rebounds under the action of the main spring shaft and collides with the limiting rod, separating the sliding stopper from the first limiting block and sliding the sliding stopper to contact the second limiting block. By providing the L-shaped rod, when the sampling bottle reaches a predetermined weight and drops, the opening is automatically sealed, and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. and sliding the sliding stopper to contact the second limiting block. By providing the L-shaped rod, when the sampling bottle reaches a predetermined weight and drops, the opening is automatically sealed, and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. and sliding the sliding stopper to contact the second limiting block. By providing the L-shaped rod, when the sampling bottle reaches a predetermined weight and drops, the opening is automatically sealed, and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. By providing the L-shaped rod, when the sampling bottle reaches a predetermined weight and drops, the opening is automatically sealed, and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. and together with the limiting rod, the sliding stopper automatically slides downward to seal the dispensing port, and the synchronization of functions can be realized. and the synchronization of functions can be realized. As one aspect of the present invention, there are 3 - 6 sets of the stirring rod sets, each set of the stirring rod sets includes 2 - 5 stirring rods, and a discharge pipe is provided on the side wall of the elution bucket. By doing so, the soil and humic acid solution after elution in the elution bucket can be conveniently discharged. . The present invention further provides a method for repairing heavy metal contaminated soil based on the above-mentioned humic acid elution of the humic acid elution-based heavy metal contaminated soil repair device. This method includes: S1, Screening: Crushing and screening the heavy metal contaminated soil by the vibrating screen, discharging the soil with a particle size <5 mm through the mud discharge pipe, and dropping the soil into the feed hopper; S2, Dispensing: During the process of the soil dropping into the elution bucket through the feed hopper, a part of the soil drops into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; S3, Elution: Until the internal soil of the elution bucket and the humic acid solution reach the preset solid-liquid ratio of 1 g:16 mL, the soil continues to drop into the elution bucket through the feed hopper. Then, the stirring motor is started to rotate the stirring shaft, and at the same time, the stirring rod set is driven to stir the internal soil of the elution bucket and the humic acid solution to realize the elution of the internal soil of the elution bucket. At the same time, under the rotation of the connecting rod, the placement slot and the sampling bottle drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; drop into the sampling bottle from the dispensing port. The humic acid solution prepared in the elution bucket and the sampling bottle is pre-added. The pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle reaches the preset 1 g:16 mL, the total weight of the sampling bottle also reaches the weight limit of the auxiliary spring shaft, and the sampling bottle begins to drop. The two auxiliary spring shafts drive the two fixing plates to contract, and the main spring shaft repels the sealing plate to seal the opening of the sampling bottle. Then, the sampling bottle drops into and is fixed in the placement slot; Drive to move the sampling bottle so that the gear shaft meshes with the gear disk and rotate, continuously invert the sampling bottle, and sufficiently contact the internal soil of the sampling bottle with the humic acid solution to realize the elution of the internal soil of the sampling bottle. The steps and, In order to achieve uniform elution, it is necessary to optimally adjust the particle size of the soil. At the same time, the preset solid-liquid ratio of the soil and the humic acid solution inside the elution bucket and the prepared humic acid solution pH value and mass concentration are optimized, so that the adjustment of the subsequent parameter optimization can be facilitated, S4. Parameter adjustment: After the elution process in step S3 is executed for 30 minutes, take out the soil after elution in the sampling bottle, detect the heavy metals in the soil after elution, and adjust the pH value of the humic acid solution and the solid-liquid ratio of the soil and the humic acid solution based on the detection results. If it is necessary to adjust the pH value of the internal humic acid solution of the elution bucket, add acid or alkaline solution. If it is necessary to adjust the solid-liquid ratio of the internal soil of the elution bucket and the humic acid solution, add humic acid solution. If it is necessary to adjust the mass concentration of the internal humic acid solution of the elution bucket, add deionized water. After the adjustment is completed, elute the internal fine-grained soil of the elution bucket for 1-2 hours to complete the repair of heavy metal contaminated soil. The steps include The present invention has the following beneficial effects (1) The heavy metal contaminated soil repair device based on humic acid elution of the present invention optimally adjusts the elution parameters in the soil elution process based on the theory of D-optimal design analysis method to improve the removal rate of heavy metal pollutants, and the removal rates of arsenic and cadmium in the soil are significantly improved. The operation of the device ​​​​It is convenient, highly automated, collects a small amount of samples through a sampling bottle, and simultaneously completes rapid elution, providing a guarantee for the implementation of the D-optimal design analysis method, and achieving better economic effects. (2) The heavy metal contaminated soil remediation device based on humic acid elution of the present invention is provided with a sliding stopper to open or seal the dispensing port, and the dispensing port can be automatically controlled according to the position of the sampling bottle, greatly improving convenience and realizing automatic sampling of the sampling bottle , avoiding soil overflow, and at the same time realizing the rotation and stirring of the sampling bottle during the stirring elution process through a dedicated placement slot, realizing function synchronization and achieving high-level integration of the device.

Brief Description of the Drawings

[0004]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

[0005] [Explanation of symbols] 1 Vibration sieve 11 Mud discharge pipe 12 Sand discharge pipe 13 Support column 2 Elution bucket 21 Main slot 22 Sub-slot 23 Gear disk 24 Acid supply pipe 25 Deionized water supply pipe 26 Alkali solution supply pipe 27 Humic acid supply pipe 28 Sampling port 29 L-shaped rod 3 Feeding hopper 31 Dispensing port 32 Fixed block 33 Sliding groove 34 First limiting block 35 Second limiting block 4 Sampling bottle 41 Main spring shaft 42 Sub-spring shaft 43 Sealing plate 44 Fixed plate 45 Sealing plug 5 Stirring motor 51 Stirring shaft 52 Stirring rod set 53 Connecting rod 54 Rotating shaft 55 Placing slot 56 Gear shaft 6 Sliding stopper 61 Slider 62 Limiting rod 7 Discharge pipe 8 Movable base

Embodiments for carrying out the invention

[0006] Example 1 As shown in Fig. 1, the heavy metal contaminated soil remediation device based on humic acid elution comprises a vibrating screen 1 and an elution bucket 2. Support columns 13 are respectively provided at the four corners of the bottom of the vibrating screen 1, and a movable base 8 is connected to the bottoms of the 4 support columns 13. The elution bucket 2 is located on the movable base 8, and a mud discharge pipe 11 provided on the bottom side of the vibrating screen 1 is docked with a feed hopper 3 provided on the top side of the elution bucket 2. The mud discharge pipe 11 is located above the feed hopper 3. A sand discharge pipe 12 is provided at the bottom of the side wall of the vibrating screen 1. An acid supply pipe 24, a deionized water supply pipe 25, an alkali liquid supply pipe 26 and a humic acid supply pipe 27 are provided at the top of the elution bucket 2. A discharge pipe 7 is provided on the opposite side of the side wall of the elution bucket 2 corresponding to the vibrating screen 1. As shown in Figs. 3 to 6 and Fig. 9, a dispensing port 31 is provided in the middle of the inner wall of the feed hopper 3 on the side where the mud discharge pipe 11 is located. A main slot 21 is provided at the top of the elution bucket 2 directly below the dispensing port 31. A sampling bottle 4 is slidably provided inside the main slot 21. A main spring shaft 41 is provided on the side of the top edge of the sampling bottle 4 where the mud discharge pipe 11 is located. Auxiliary spring shafts 42 are symmetrically provided on both sides of the top edge of the sampling bottle 4 with respect to the main spring shaft 41. A sealing plate 43 that seals and docks the opening at the top of the sampling bottle 4 is fixed on the main spring shaft 41. A sealing plug 45 is provided on the inner wall of the sealing plate 43. A fixing plate 44 for fixing the sampling bottle 4 inside the main slot 21 is provided on the auxiliary spring shaft 42. Auxiliary slots 22 for arranging the fixing plates 44 are respectively provided on both sides of the main slot 21 at the top of the elution bucket 2. As shown in FIGS. 1 to 4 and FIG. 8, a stirring motor 5 is provided at the center of the top of the elution bucket 2. The stirring motor 5 is a commercially available industrial stirring motor. A stirring shaft 51 penetrating the elution bucket 2 is provided at the bottom output end of the stirring motor 5. On the stirring shaft 51, three sets of stirring rod sets 52 are provided from top to bottom. On each set of stirring rod sets 52, three stirring rods are provided at equal intervals in the circumferential direction. Above the uppermost set of stirring rod sets 52 of the stirring shaft 51, a connecting rod 53 is provided. A rotating shaft 54 is rotatably connected to the end of the connecting rod 53. At the end of the rotating shaft 54, a placement slot 55 for placing the sampling bottle 4 is provided. When the sampling bottle 4 is fixed inside the main slot 21, the sampling bottle 4 is located directly above the placement slot 55. On the side where the mud discharge pipe 11 is located on the outer wall of the placement slot 55, a gear shaft 56 is provided. The gear shaft 56 is engaged with a gear disk 23 provided on the inner wall of the elution bucket 2. The sampling bottle 4 is made of iron and its surface is coated with an anti-corrosion layer paint. The bottom of the inner wall of the placement slot 55 is made of a magnet and is used to fix the sampling bottle 4 after it has fallen in. The cross-sectional shapes of the sampling bottle 4, the main slot 21, and the placement slot 55 are all circular. A sampling port 28 is provided on the side wall of the elution bucket 2. When the sampling bottle 4 moves to the position of the sampling port 28 under the combined action of the stirring shaft 51 and the gear shaft 56, the opening direction of the sampling bottle 4 is vertically upward. As shown in FIGS. 4 to 7, the dispensing port 31 is opened or sealed by a sliding stopper 6. Fixed blocks 32 are respectively provided on both sides of the outer wall of the feed hopper 3 corresponding to the dispensing port 31. The fixed block 32 has a sliding groove 33 on its inner wall, and the sliding stopper 6 has a sliding groove 33 on both sides. A slider 61 is provided for each of the slide grooves 33, and the slider 61 is slidable in one-to-one correspondence with the slide groove 33. A first limiting block 34 is provided between the tops of the two fixed blocks 32. A second limiting block 35 is provided between the bottoms of the fixed blocks 32, and the sliding stopper 6 is made of iron. The surface is coated with a corrosion prevention layer paint, and the first limiting block 34 is made of a magnet. The elution bucket 2 is docked with the sliding stopper 6 and fixed in place, and the mud discharge portion of the top side wall of the elution bucket 2 is An L-shaped rod 29 is provided below the tube 11, and the sampling bottle 4 is inserted into the main slot. When the L-shaped rod 29 is fixed inside the sealing plate 43, the end of the L-shaped rod 29 contacts the end of the sealing plate 43. The seal plate 43 is kept open by the rod 62, which is provided at the center of the bottom of the slide stopper 6. When the sampling bottle 4 is fixed inside the main slot 21, the limiting rod 6 2 is located on one side of the sealing plate 43, and 640 ml of humic acid solution is placed in the sampling bottle 4. The soil was dropped into sampling bottle 4, and the solid-liquid ratio of the soil to the humic acid solution was 1g:16. When the total weight of the sampling bottle 4 reaches the weight limit of the secondary spring shaft 42, When the sampling bottle 4 falls, the sealing plate 43 contacts the main Under the action of the shaft 41, the rod collides with the limiting rod 62 while rebounding, and the sliding stopper 6 becomes the first limiting rod. The sliding stopper 6 is separated from the block 34 so as to come into mutual contact with the second limiting block 35. Slide it in. Example 2 Unlike Example 1, in this example, Four stirring rod sets 52 are provided on the stirring shaft 51 from top to bottom. The set 52 includes two stirring rods, and 600 ml of fulvic acid solution is put into the sampling bottle 4. therein. Example 3 Different from Example 1, in this example, six sets of stirring rod sets 52 are provided on the stirring shaft 51 from top to bottom, and each set of stirring rods The set 52 includes five stirring rods, and 800 ml of fulvic acid solution is put into the sampling bottle 4. therein. Example 4 This example is a method for repairing heavy metal contaminated soil based on fulvic acid elution, based on the repair device for heavy metal contaminated soil based on fulvic acid elution in Example 1. As shown in FIG. 10, S1, screening: crushing and screening the heavy metal contaminated soil by the vibrating screen 1, discharging the soil with a particle size <5 mm through the mud discharge pipe 11, and dropping the soil into the feed hopper 3. S2, dispensing: In the process of the soil dropping into the elution bucket 2 through the feed hopper 3, part of the soil drops into the sampling bottle 4 from the dispensing port 31, and the fulvic acid solution prepared in the elution bucket 2 and the sampling bottle 4 is added in advance, and the pH value of the prepared fulvic acid solution is 7 and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the fulvic acid solution in the sampling bottle 4 reaches the preset 1 g:16 mL, the total weight of the sampling bottle 4 also reaches the weight limit of the secondary spring shaft 42, and the sampling bottle 4 begins to fall. The two secondary spring shafts 42 drive the two fixing plates 44 to contract, and the main spring shaft 41 repels the sealing plate 43 to seal the opening of the sampling bottle 4, and then the sampling bottle 4 drops into and is fixed in the placement slot 55. S3, elution: The internal soil and fulvic acid solution in the elution bucket 2 reach the preset solid-liquid ratio of 1 g:1 16 mL, and the stirring rod set 52 stirs the mixture in the sampling bottle 4 at a speed of 120 r / min for 20 minutes, and then the stirring rod set 52 stirs the mixture in the sampling bottle 4 at a speed of 180 r / min for 15 minutes, and then the stirring rod set 52 stirs the mixture in the sampling bottle 4 at a speed of 240 r / min for 10 minutes, and then the stirring rod set 52 stirs the mixture in the sampling bottle 4 at a speed of 300 r / min for 5 minutes, and then S3, elution: The internal soil and fulvic acid solution in the elution bucket 2 reach the preset solid-liquid ratio of 1 g:1 The soil continues to fall into the elution bucket 2 through the feed hopper 3 until it reaches 6 mL, and subsequently, the stirring motor 5 is started to rotate the stirring shaft 51, and at the same time, the stirring rod set 52 is driven to stir the internal soil of the elution bucket 2 and the humic acid solution, and while realizing the elution of the internal soil of the elution bucket 2, under the rotation of the connecting rod 53, the placement slot 55 and the sampling bottle 4 are driven to move, the gear shaft 56 meshes with the gear disk 23 and rotates, the sampling bottle 4 is continuously inverted, the internal soil of the sampling bottle 4 and the humic acid solution are sufficiently contacted, and the step of realizing the elution of the internal soil of the sampling bottle 4, S4, parameter adjustment: After the elution process in step S3 is performed for 30 min, the eluted soil in the sampling bottle 4 is taken out, the heavy metals in the eluted soil are detected, and based on the detection results subsequently, the pH value of the humic acid solution and the solid-liquid ratio of the soil and the humic acid solution are adjusted. If it is necessary to adjust the pH value of the internal humic acid solution of the elution bucket 2, an acid or alkali solution is added. If it is necessary to adjust the solid-liquid ratio of the internal soil of the elution bucket 2 and the humic acid solution, humic acid solution is added. If it is necessary to adjust the mass concentration of the internal humic acid solution of the elution bucket 2, deionized water is added. After the adjustment is completed, the internal fine-grained soil of the elution bucket 2 is eluted for 1.5 h to complete the repair of the heavy metal contaminated soil, including the step of and. Example 5 Different from Example 4, in this example, in step S4, after the adjustment of the internal parameters of the elution bucket 2 is completed, the soil inside the elution bucket 2 continues to be eluted for 1 h to complete the elution repair of the heavy metal contaminated soil. Example 6 Different from Example 4, in this example, In step S4, after adjusting the internal parameters of the elution bucket 2, the soil inside the elution bucket 2 is continuously eluted for 2 h to complete the elution and repair of the heavy metal contaminated soil. Working principle: The working principle of the device of the present invention will be further described below in combination with the method of the present invention . When step S2 is executed, first, the sampling bottle 4 is fixed in the main slot 21, and at this time, the sliding stopper 6 is located at the uppermost position and is magnetically docked and fixed with the first limiting block 34, the opening of the dispensing port 31 is maintained, and when the sampling bottle 4 drops, the two fixing plates 44 drop through the main slot 21 under the action of the auxiliary spring shaft 42, and at the same time, the sealing plate 43 rebounds under the action of the main spring shaft 41. At this time, a sufficient rebound force of the main spring shaft 41 is required to rebound and pull the limiting rod 62 during the dropping process of the sampling bottle 4, causing the sliding stopper 6 to slide, the slider 61 to slide in the sliding groove 33, and the sliding stopper 6 to slide until it contacts the second limiting block 35. At this time, the sliding stopper 6 seals the dispensing port 31, and at the same time, the sampling bottle 4 is also automatically sealed and drops into the inside of the placement slot 5 5 and is magnetically fixed to the bottom of the placement slot 55. When step S3 is executed, as the connecting rod 53 rotates, the gear shaft 56 meshes with the gear disc 23 and moves, and the sampling bottle 4 continuously rotates in the reverse direction under the action of the rotating shaft 54. It should be noted that the length of the gear shaft 56 should be sufficient so that the edge does not touch the gear disc 23 during the reverse rotation of the sampling bottle 4. When the connecting rod 53 rotates one turn, the sampling bottle 4 rotates about 30 to 40 revolutions, improving the internal stirring efficiency of the sampling bottle 4 and reducing the soil sample inside the sampling bottle 4 should be noted. When the connecting rod 53 rotates one turn, the sampling bottle 4 rotates about 30 to 40 revolutions, improving the internal stirring efficiency of the sampling bottle 4, and the soil sample inside the sampling bottle 4 is less ​ Since there is no shortage, stirring is sufficient, and elution is uniform, the soil inside the sampling bottle 4 elutes It completes the elution process earlier than the soil inside the bucket 2 and performs the step of step S4 so that it can be taken out earlier.

[0007] Experimental example Hereinafter, the feasibility of the device and method of the present invention is verified through specific experiments, and the soil used in the experiment is black soil, and the amount of humic acid solution initially added to the sampling bottle 4 is 640 mL. When 40 g of fine-grained black soil dropped into the sampling bottle 4, the secondary spring shaft 4 reached the weight limit, the sampling bottle 4 began to drop, and after the elution of the fine-grained black soil inside the sampling bottle 4 was completed, the sampling bottle 4 was taken out and step S4 was performed and the detected data was substituted into the fitting model formula based on the D-optimal design: Y Y 黒土-ヒ素 =41.69 - 7.73X1 - 40.07X2 + 15.79X3 - 9.23X1 2 +29.63X2 2 -10.24X3 2 -4.33X1X2 + 1.93X1X3 - 1.61 X2X3, Y 黒土-カドミウム =47.48 + 24.6X1 - 40.87X2 + 3.82X3 - 16.4 6X1 2 +16.91X2 2 -14.22X3 2 -7.28X1X2 + 0.61X1X3 - 0 .56X2X3, Perform a P-value test on the fitting model and goodness of fit based on the D-optimal design, and ANOVA analysis results and significance test results are obtained, and all the P-values obtained from the fitting of this experimental example are 0.0001 less than, and the removal rates of arsenic (As) and cadmium (Cd) in black soil and the relationship between the three factors The system generally shows very significant results, The measured removal rate of arsenic (As) obtained by eluting black soil with humic acid solution and the predicted value of the removal rate of arsenic (As) corresponding to the fitting model formula based on the D-optimal design The goodness-of-fit R of the predicted value of the removal rate of cadmium (Cd) corresponding to the fitting model formula based on the D-optimal design 2 is 0.898 9, and the measured value of the removal rate of cadmium (Cd) obtained by eluting black soil with humic acid solution and the predicted value of the removal rate of cadmium (Cd) corresponding to the fitting model formula based on the D-optimal design The goodness-of-fit R 2 is 0.9204, and the predicted and measured values of the removal rates of arsenic (As ) and cadmium (Cd) in the removal of black soil by eluting with humic acid solution have a good linear relationship. The statistical validity of the fitting model based on the D-optimal design is tested by the goodness-of-fit R 2 , and R 2 is an important parameter for judging the validity of the regression equation . R 2 = 0.8285 - 0.9500 In the case of, it indicates that the fitting effect of the empirical model is good. As can be seen from the analysis of variance and model diagnosis , the model has a high significance and can effectively simulate and predict the response value . After the single-factor experiment of humic acid elution treatment, regarding the elution efficiency of arsenic (As) and cadmium (Cd) in the three soils , the absolute value of the β i of the solid-liquid ratio (S / L) of the contaminated soil and the humic acid solution is higher than the absolute values of the β of the other two i elution process parameters (humic acid concentration, humic acid pH). Therefore, the solid-liquid ratio (S / L) of the contaminated soil and the humic acid solution is the main control parameter with the strongest effect in the process parameters for eluting and removing arsenic (As) and cadmium (Cd) in the single-factor experiment of humic acid elution. The solid-liquid ratio (S / L) of the contaminated soil and the humic acid solution The negative sign of the linear coefficient of (L) is almost the same as the decrease in the solid-liquid ratio (S / L) of the contaminated soil and humic acid solution, that is, the higher the volume of the humic acid solution, the higher the removal efficiency of arsenic (As) and cadmium (Cd). There is a certain interaction among the three factors, and the independent variable of a single factor is restricted by other factors. Specifically, for the removal efficiency of arsenic (As) and cadmium (Cd), no obvious synergistic effect was found between the solid-liquid ratio (S / L) of the contaminated soil and humic acid solution and the other two factors. The improvement of the removal efficiency is mainly dominated by the solid-liquid ratio (S / L) of the contaminated soil and humic acid solution, which is consistent with the single-factor effect. The humic acid concentration and the humic acid pH value jointly affect the removal efficiency of arsenic. The removal efficiency of arsenic increases with the increase of the humic acid pH value, and the favorable concentration range for black soil is 7.5-8.5 mg / L. The ellipse in the two-dimensional contour map shows the removal rate of cadmium, and there is a strong interaction between the humic acid concentration and the humic acid pH value. The appropriate pH value is around 7.0. With the increase of the solid-liquid ratio, that is, as the volume of the humic acid eluent increases, the removal efficiency reaches the highest level. However, if the amount of the eluent is further increased, a large amount of leachate containing heavy metals will be generated, and the cost of using humic acid and treating the leachate will increase. Therefore, from a practical perspective, the solid-liquid ratio was selected as 1:20. As can be seen from the above conclusions, inside the elution bucket 2, it is necessary to appropriately increase the solid-liquid ratio, keep the pH value unchanged, and decrease the concentration of the humic acid solution. Therefore, an appropriate amount of humic acid solution with a pH value of 7 can be added inside the elution bucket 2. The parameter adjustment can be realized by adding the humic acid solution that meets the requirements through the deionized water replenishment pipe 25 and the humic acid replenishment pipe 27. As can be seen from the above conclusions, inside the elution bucket 2, it is necessary to appropriately increase the solid-liquid ratio, keep the pH value unchanged, and decrease the concentration of the humic acid solution. Therefore, an appropriate amount of humic acid solution with a pH value of 7 can be added inside the elution bucket 2. The parameter adjustment can be realized by adding the humic acid solution that meets the requirements through the deionized water replenishment pipe 25 and the humic acid replenishment pipe 27. If an appropriate amount of humic acid solution with a pH value of 7 is added, the parameter adjustment can be realized by adding the humic acid solution that meets the requirements through the deionized water replenishment pipe 25 and the humic acid replenishment pipe 27. Continue to elute the internal soil of the outlet bucket 2 for 1.5 h to complete the elution and repair of the heavy metal contaminated soil. Finally, the arsenic removal rate of the black soil in the sampling bottle 4 is 58%, and the arsenic removal rate of the black soil in the elution bucket 2 after parameter adjustment is 64%. The cadmium removal rate of the black soil in the sampling bottle 4 is 61%, and the arsenic removal rate of the black soil in the elution bucket 2 after parameter adjustment is 67%. The device and method of the present invention can effectively improve the removal rates of heavy metals arsenic and cadmium in the soil. ​

Claims

1. It is composed of a vibrating sieve (1) and a dissolution bucket (2), The mud discharge pipe (11) provided on the bottom side of the vibrating screen (1) is The mud discharge pipe (11) is docked with the supply hopper (3) provided on the top side. Located above the feeding hopper (3), the mud discharge pipe (1) on the inner wall of the feeding hopper (3) A dispensing port (31) is provided in the center of the side where the nozzle 1) is located, and the A main slot (21) is provided at the top of the elution bucket (2), and the main slot ( A sampling bottle (4) is slidably provided inside the sampling bottle (21), and the sampling bottle A main spring shaft (41) is provided on the side of the top edge of the tank (4) where the mud discharge pipe (11) is located. , a secondary spring is provided on both sides of the top edge of the sampling bottle (4) relative to the main spring shaft (41). The main spring shaft (41) is provided symmetrically with the sampling bottle (42). A seal plate (43) is fixedly provided for sealing and docking the top opening of the (4). The sampling bottle (4) is inserted into the main slot on the secondary spring shaft (42). A fixing plate (44) for fixing the elution bucket (2) to the inside of the elution bucket (21) is provided. The fixing plates (44) are arranged on both sides corresponding to the main slot (21) at the top. A secondary slot (22) is provided for placing the A stirring motor (5) is provided at the top center of the elution bucket (2), and the stirring motor (5 The bottom output end of the stirring bucket (51) is provided with a stirring shaft (51) penetrating the elution bucket (2), A plurality of stirring rod sets (52) are provided on the stirring shaft (51) from top to bottom, A connecting rod (53) is provided above the uppermost stirring rod set (52) of (51). and a rotary shaft (54) is rotatably connected to an end of the connecting rod (53), and the rotary shaft (54) is provided with a mounting slot (5 5) for placing the sampling bottle (4), and when the sampling bottle (4) is fixed inside the main slot (21), the sampling bottle (4) is positioned directly above the mounting slot (55), and a gear shaft (56) is provided on the side of the outer wall of the mounting slot (55) where the mud discharge pipe (11) is located. The gear shaft (56) meshes with a gear disk (23) provided on the inner wall of the elution bucket (2). The sampling bottle (4) is made of iron and is coated with an anti-corrosion layer on the surface. The bottom of the inner wall of the mounting slot (55) is made of a magnet. At the top of the elution bucket (2), an acid replenishing pipe (24), a deionized water replenishing pipe (25), an alkali solution replenishing pipe (26) and a humic acid replenishing pipe (27) are provided. A heavy metal contaminated soil remediation device based on humic acid elution, characterized in that.

2. Support columns (13) are respectively provided at the four bottom corners of the vibrating screen (1), and a movable base (8) is connected to the bottom of the four support columns (13). The elution bucket (2) is located on the movable base (8). A sand discharge pipe (12) is provided at the bottom of one side wall of the vibrating screen (1). The cross-sectional shapes of the sampling bottle (4), the main slot (21), and the mounting slot (55) are all circular. A sampling port (28) is provided on the side wall of the elution bucket (2). When the sampling bottle (4) moves to the position of the sampling port (28) under the combined action of the stirring shaft (51) and the gear shaft ( 56), the sampling bottle (4) The opening direction of the sampling bottle (4) is vertically upward, and a sealing plug (45) is provided on the inner wall of the sealing plate (43). The heavy metal contaminated soil remediation device based on humic acid elution according to claim 1, characterized in that is provided.

3. A sliding stopper (6) is provided at the dispensing port (31), and fixed blocks (32) are respectively provided on both sides of the outer wall of the feed hopper (3) corresponding to the dispensing port (31). A sliding groove (33) is provided on the inner wall of the fixed block (32), and sliders (61) are respectively provided on both sides of the sliding stopper (6). The slider (61) is slidably connected to the sliding groove (33) in a one-to-one correspondence. A first limiting block (34) is provided between the tops of the two fixed blocks (32). A second limiting block (35) is provided between the bottoms of the two fixed blocks (32). The sliding stopper (6) is made of iron and has a corrosion prevention layer coated on its surface. The first limiting block (34) is made of a magnet. The heavy metal contaminated soil remediation device based on humic acid elution according to claim 1, characterized in that is provided.

4. An L-shaped rod (29) is provided at a position below the side wall at the top of the elution bucket (2) corresponding to the mud discharge pipe (11). When the sampling bottle (4) is fixed inside the main slot (21), the end of the L-shaped rod (29) contacts the end of the sealing plate (43) to open the sealing plate (43). A limiting rod (62) is provided at the center of the bottom of the sliding stopper (6). When the sampling bottle (4) is fixed inside the main slot (21), the limiting rod (62) is on one side of the sealing plate (43).

5.

6.

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8.

9. Positioned, 600 - 800 ml of humic acid solution is placed in the sampling bottle (4), and soil falls into the said sampling bottle (4), and when the solid - liquid ratio of the soil and the humic acid solution reaches 1 g:16 m L, the total weight of the sampling bottle (4) reaches the weight limit of the auxiliary spring shaft (42), and the sampling bottle (4) falls. When the sampling bottle (4) falls, the sealing plate (43) rebounds under the action of the main spring shaft (41) and collides with the limiting rod (62 ), separating the sliding stopper (6) from the first limiting block (34) and sliding the sliding stopper (6) so as to be in mutual contact with the second limiting block (35). The heavy - metal - contaminated soil remediation device based on humic acid elution according to claim 3 is characterized by this, device.

5. There are 3 - 6 sets of the stirring rod sets (52), each set of the stirring rod sets (52) includes 2 - 5 stirring rods, and a discharge pipe (7) is provided on the side wall of the elution bucket (2). The heavy - metal - contaminated soil remediation device based on humic acid elution according to claim 1 is characterized by this,

6. A heavy - metal - contaminated soil remediation method based on humic acid elution using the heavy - metal - contaminated soil remediation device according to any one of claims 1 - 5, comprising: S1, Screening: Crushing and screening the heavy - metal - contaminated soil by the vibrating screen (1), discharging the soil with a particle size < 5 mm through the mud discharge pipe (11), and letting the soil fall into the feed hopper (3). Step; S2, Dispensing: During the process that the soil falls into the elution bucket (2) through the feed hopper (3), part of the soil falls into the sampling bottle (4) from the dispensing port (31), and the ​​​​​The humic acid solution prepared in the dissolution bucket (2) and the sampling bottle (4) is added in advance and the pH value of the prepared humic acid solution is 7, and the mass concentration is 10 g / L. When the solid-liquid ratio of the soil and the humic acid solution in the sampling bottle (4) reaches the preset 1 g:1 6 mL, the total weight of the sampling bottle (4) also reaches the weight limit of the auxiliary spring shaft (42), and the sampling bottle (4) begins to fall, and the two auxiliary spring shafts (4 2) drive to contract the two fixing plates (44), and the main spring shaft (41) repels the sealing plate (43) to seal the opening of the sampling bottle (4), and then the sampling bottle (4) falls into and is fixed in the placement slot (55) in the above steps and, S3. Dissolution: Until the solid-liquid ratio of the internal soil of the dissolution bucket (2) and the humic acid solution reaches the preset 1 g:16 mL, the soil continues to fall into the dissolution bucket (2) through the feeding hopper (3), and then the stirring motor (5) is started to rotate the stirring shaft (51), and at the same time, the stirring rod set (52) is driven to stir the internal soil of the dissolution bucket (2) and the humic acid solution, to realize the dissolution of the internal soil of the dissolution bucket (2), and at the same time, under the rotation of the connecting rod (53), the placement slot (55) and the sampling bottle (4) are driven to move, the gear shaft (56) meshes with the gear disk (23 ) and rotates, continuously reversing the sampling bottle (4), and making the internal soil of the sampling bottle (4) and the humic acid solution come into sufficient contact to realize the dissolution of the internal soil of the sampling bottle (4) step, and S4. Parameter adjustment: After performing the elution step of step S3 for 30 minutes, the soil after elution in the sampling bottle (4) is taken out, the heavy metals in the soil after elution are detected, and based on the detection results, the pH value of the humic acid solution and the solid-liquid ratio of the soil and the humic acid solution are adjusted. If it is necessary to adjust the pH value of the internal humic acid solution in the elution bucket (2), an acid or an alkali solution is added. If it is necessary to adjust the solid-liquid ratio of the internal soil and the humic acid solution in the elution bucket (2), a humic acid solution is added. If it is necessary to adjust the mass concentration of the internal humic acid solution in the elution bucket (2), deionized water is added. After the adjustment is completed, the fine-grained soil inside the elution bucket (2) is eluted for 1 to 2 hours to complete the repair of the heavy metal contaminated soil, including the steps of, and is characterized by a method for repairing heavy metal contaminated soil based on humic acid elution. The soil after elution in the sampling bottle (4) is taken out, the heavy metals in the soil after elution are detected, and based on the detection results, the pH value of the humic acid solution and the solid-liquid ratio of the soil and the humic acid solution are adjusted. If it is necessary to adjust the pH value of the internal humic acid solution in the elution bucket (2), an acid or an alkali solution is added. If it is necessary to adjust the solid-liquid ratio of the internal soil and the humic acid solution in the elution bucket (2), a humic acid solution is added. If it is necessary to adjust the mass concentration of the internal humic acid solution in the elution bucket (2), deionized water is added. After the adjustment is completed, the fine-grained soil inside the elution bucket (2) is eluted for 1 to 2 hours to complete the repair of the heavy metal contaminated soil. The steps of, and are characterized by a method for repairing heavy metal contaminated soil based on humic acid elution. Including the steps of, and is characterized by a method for repairing heavy metal contaminated soil based on humic acid elution.

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