Attapulgite-based permeable reactive barrier and method for repairing halogenated hydrocarbon polluted site

Abstract

The invention provides an attapulgite-based permeable reactive barrier and method for repairing a halogenated hydrocarbon polluted site, and belongs to the technical field of underground water treatment. Comprising a reaction wall main body which is distributed perpendicular to the water flow direction, a front guide wall which is arranged at a water flow inlet of the reaction wall main body, a rear guide wall which is arranged at a water flow outlet of the reaction wall main body and is symmetrical to the front guide wall, and a plurality of attapulgite filter material modules which are arranged on the reaction wall main body, through the first mounting racks and the second mounting racks which are of a wave-shaped structure, the water flow path can be prolonged, the contact time of pollutants and the attapulgite filter material modules is prolonged, meanwhile, the second mounting rack is arranged on the water outlet side of each first mounting rack, and a rotary mounting frame used for mounting the attapulgite filter material modules is arranged on each second mounting rack; and when the water body passes through the reactive barrier main body, the water flow can be accelerated to pass through under the action of rotating the mounting frame, so that the whole treatment efficiency of the permeable reactive barrier can be improved while the purification effect is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater treatment, and in particular relates to an attapulgite-based permeable reaction wall and a method for repairing a halogenated hydrocarbon contaminated site. Background Art

[0002] The survival and development of human society are inseparable from water resources, of which groundwater is one of the most important resources currently available to humanity. Groundwater resources are characterized by excellent water quality and wide distribution, making them a common water supply source. Groundwater is in great demand for agricultural irrigation and daily life. However, in modern times, the rapid development and disorderly expansion of petrochemical production, as well as the excessive use of pesticides, have led to increasing contamination of groundwater, rendering it unusable.

[0003] Chlorinated hydrocarbons are widely used in the chemical industry and are currently the most polluting type of volatile organic pollutants to groundwater and soil. They are highly volatile, difficult to degrade under natural conditions, and the products of the degradation process are diverse and most of them are also highly harmful.

[0004] Traditional remediation technologies (such as extraction and chemical oxidation) have drawbacks such as high cost and the tendency to generate secondary pollution. However, permeable reactive wall technology has attracted widespread attention due to its passive remediation properties. However, existing permeable reactive wall technology still has the following problems:

[0005] First, groundwater velocity fluctuations or sudden impacts can easily cause deformation of the reaction wall structure or loss of filler, making it difficult to ensure repair efficiency;

[0006] Second, traditional fixed filter media is difficult to replace, requiring frequent excavation and repair, which increases operation and maintenance costs;

[0007] Third, single fillers (such as zero-valent iron) mainly rely on reductive dechlorination and have insufficient synergistic treatment capabilities for multi-component halogenated hydrocarbons and co-pollutants. Summary of the Invention

[0008] In response to the above-mentioned problems, the present invention provides a attapulgite-based permeable reaction wall and method for repairing halogenated hydrocarbon contaminated sites.

[0009] The technical solution of the present invention is: a attapulgite-based permeable reaction wall for repairing halogenated hydrocarbon contaminated sites, comprising a reaction wall body distributed perpendicular to the water flow direction, a front guide wall provided at the water inlet of the reaction wall body, a rear guide wall provided at the water outlet of the reaction wall body and symmetrically distributed with the front guide wall, and a plurality of attapulgite filter material modules installed on the reaction wall body;

[0010] The reaction wall body includes horizontal mounting plates parallel to the front and rear sides of the river bank, and a plurality of first mounting frames and a plurality of second mounting frames vertically mounted between the two horizontal mounting plates and parallel to each other, wherein the first mounting frames are staggered with the second mounting frames.

[0011] The first mounting frame is composed of a plurality of first mounting frames that are staggered end to end and form a wave-shaped structure, and the side walls of the first mounting frames are provided with first engaging recesses. The second mounting frame is composed of a plurality of second mounting frames that are staggered end to end and form a wave-shaped structure, and the inclination angles of the second mounting frames on the same second mounting frame are symmetrically distributed with the inclination angles of the first mounting frames on the adjacent first mounting frames. A rotating mounting frame is connected to the second mounting frame via a rotating shaft, and the side walls of the rotating mounting frame are provided with second engaging recesses.

[0012] A plurality of the attapulgite filter material modules are respectively installed at each of the first clamping recesses and each of the second clamping recesses.

[0013] Furthermore, a sedimentation well is provided at the water inlet of the reaction wall body and at the lower end of the front guide wall. The inner wall of the sedimentation well is provided with several vertically arranged aeration pipes, and each of the aeration pipes is provided with several microporous aeration heads.

[0014] Description: The function of the sedimentation injection well is to collect sediment at the bottom of the water body to prevent it from directly entering the main body of the reaction wall and clogging the attapulgite filter material module, affecting the permeability. At the same time, an aeration pipe with a microporous aeration head is set on the inner wall of the sedimentation injection well. Compressed air is released from the bottom to generate an upward bubble flow, which drives the water in the sedimentation injection well to produce vertical convection circulation to achieve effective mixing of sediment water and surface water. It can maintain the aerobic state of the water in the sedimentation injection well, inhibit the activity of anaerobic microorganisms, and reduce odor generation and secondary release of pollutants.

[0015] Furthermore, buffer sliding openings corresponding to the first mounting frame and the second mounting frame are respectively provided on opposite sides of the two horizontal mounting plates, the two first mounting frames located at the ends of the first mounting frame are slidably connected to the corresponding buffer sliding openings, and the two second mounting frames located at the ends of the second mounting frame are slidably connected to the corresponding buffer sliding openings.

[0016] Description: When water flows into the main body of the reaction wall, under the impact force of the water flow, each first mounting frame and each second mounting frame can slide slightly in the corresponding buffer sliding opening on the horizontal mounting plate, so that the impact force of the water flow is dispersed and buffered, reducing the direct impact on the first mounting frame and the second mounting frame, reducing the vibration and deformation of the structure caused by the impact of the water flow, improving the stability and safety of the first mounting frame and the second mounting frame, so that the main body of the reaction wall can work normally under different water flow conditions, and improving the adaptability of the project to complex water flow environments.

[0017] Furthermore, each of the second installation frames located on the same second installation rack and spaced apart is connected to the first installation frames adjacent to the left and right sides via a buffer support rod.

[0018] Description: While each first mounting frame and each second mounting frame slides slightly in the corresponding buffer sliding openings on the horizontal mounting plate to disperse and buffer the impact force of the water flow, the buffer support rod also elastically supports the first mounting frame and the second mounting frame, which can absorb and dissipate part of the impact force of the water flow and improve the seismic resistance of the permeable reaction wall under the impact of water flow.

[0019] Furthermore, the attapulgite filter material module includes two buckling frames that are relatively distributed and hinged at the bottom ends, an attapulgite filter material bag with an elastic metal mesh installed on the side walls of the buckling frames and placed between the two buckling frames, and the upper ends of the two buckling frames are buckled with each other.

[0020] Description: Two snap-fit frames that are hinged to each other at the bottom and snap-fitted at the upper end are used as external support parts, and elastic metal meshes are installed on the side walls of each snap-fit frame. The attapulgite filter media bag is placed in the space between the two snap-fit frames. When water flows through the attapulgite filter media bag for processing, the two snap-fit frames can protect the internal attapulgite filter media bag, and can effectively prevent the filter media from being lost due to the erosion of water flow. At the same time, the elastic metal mesh can produce elastic deformation to a certain extent as the pressure of the water flow changes. At the same time, the snap-fit frames ensure the stability of the overall structure, so that the attapulgite filter media bag can be effectively protected under different working conditions.

[0021] Furthermore, the surface of the attapulgite filter material bag is coated with a corrosion-resistant grid, and the material of the attapulgite filter material bag is a mixture of attapulgite, nano zero-valent iron and activated carbon in a mass ratio of 4:2:1.

[0022] Description: The corrosion-resistant grid coated on the surface can protect the attapulgite, nano-zero-valent iron and activated carbon inside the attapulgite filter media bag, further preventing them from being lost or becoming ineffective due to factors such as water erosion and chemical corrosion during long-term use. At the same time, attapulgite, nano-zero-valent iron and activated carbon are all environmentally friendly materials. During use, they can absorb organic matter and some halogenated hydrocarbons in water without causing secondary pollution, and are environmentally friendly.

[0023] Furthermore, the cross-sections of the front guide wall and the rear guide wall are trapezoidal or arc-shaped, the angles between the inclined surfaces of the front guide wall and the rear guide wall and the direction of water flow are 30°-60°, and the front guide wall and the rear guide wall are both provided with inclined porous guide plates, the hole diameter of the porous guide plates is 5-10 mm, which further disperses the impact force of the water flow.

[0024] Description: By limiting the angle between the inclined surface of the front guide wall and the rear guide wall and the water flow direction to 30°-60°, it is used to reduce turbulence and evenly distribute the water flow. The porous guide plate can further disperse the impact force of the water flow, reduce local stress concentration, and avoid cracking or deformation of the front guide wall and the rear guide wall.

[0025] A method for repairing a halogenated hydrocarbon contaminated site, based on the above-mentioned attapulgite-based permeable reactive wall for repairing a halogenated hydrocarbon contaminated site, comprises the following steps:

[0026] S1. The contaminated water at the halogenated hydrocarbon contaminated site flows through the front guide wall, which guides the flow of the contaminated water into the main body of the reaction wall;

[0027] S2. The polluted water first flows through the first first installation frame, where the organic matter and some halogenated hydrocarbons in the polluted water are first adsorbed and degraded by the attapulgite filter material modules installed on each first installation frame, which is staggered end to end and forms a wave-like structure;

[0028] S3. When the water body that has completed the first adsorption and degradation passes through the first second mounting frame and passes through the second mounting frames that are staggered end to end and form a wave-like structure, the rotating mounting frame will rotate under the impact of the water flow. On the one hand, the attapulgite filter material modules on the rotating mounting frame adsorb and degrade organic matter and some halogenated hydrocarbons in the local water body. On the other hand, the rotating mounting frame can accelerate the flow rate of the water body;

[0029] S4. After the water passes through the first second mounting rack, it enters the second first mounting rack again and is again subjected to a second adsorption and degradation of organic matter and some halogenated hydrocarbons in the water by the attapulgite filter material modules installed on the first mounting frames that are staggered end to end and form a wave-like structure. The water that has completed the second adsorption and degradation passes through the second second mounting rack and repeats step S3. While adsorbing and degrading organic matter and some halogenated hydrocarbons in the local water, the water is accelerated to flow into the third first mounting rack.

[0030] S5. Repeat step S4 until the water flows through the last first mounting rack, completes several adsorption and degradation of organic matter and some halogenated hydrocarbons in the water, and then flows out through the last second mounting rack, and the outflow of the water is guided.

[0031] Furthermore, in steps S2-S5, the attapulgite filter material modules at each of the first clamping recesses and each of the second clamping recesses are replaced every 4-5 months.

[0032] Note: Regular replacement of the attapulgite filter media module can ensure that the reaction wall always maintains good filtration and adsorption effects, improve the removal capacity of pollutants such as halogenated hydrocarbons, and ensure that the effluent water quality is stable and meets the standards.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] When in use, the attapulgite-based permeable reaction wall for repairing halogenated hydrocarbon contaminated sites of the present invention can extend the water flow path and increase the contact time between pollutants and the attapulgite filter material module through the first and second mounting frames of the wavy structure. The attapulgite filter material module is buckled in the first and second mounting frames, which shortens the replacement time and improves work efficiency. At the same time, a second mounting frame is provided on the water outlet side of each first mounting frame, and a rotating mounting frame for mounting the attapulgite filter material module is provided on the second mounting frame. When the water body passes through the reaction wall body, the rotating mounting frame can accelerate the water flow. While ensuring the purification effect, it can also improve the overall treatment efficiency of the permeable reaction wall. The first and second mounting frames in the reaction wall body can effectively disperse and buffer the impact force of the water flow through the design of the buffer sliding port, reduce the direct impact on the first and second mounting frames, and reduce the vibration and deformation of the structure caused by the water flow impact. The buffer support rod also elastically supports the first and second mounting frames, which can absorb and dissipate part of the water flow impact force, thereby improving the seismic resistance of the permeable reaction wall under water flow impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a first top view of the present invention;

[0036] Figure 2 is a second top view of the present invention;

[0037] Figure 3 is a structural schematic diagram of a first mounting frame of the present invention;

[0038] Figure 4 2. It is a structural schematic diagram of the first mounting frame when the attapulgite filter material module of the present invention is installed;

[0039] Figure 5 is a schematic structural diagram of a second mounting frame of the present invention;

[0040] Figure 6 This is a schematic structural diagram of the second mounting frame when the attapulgite filter material module of the present invention is installed;

[0041] Figure 7 It is a schematic diagram of the partial connection structure of the first mounting bracket, the second mounting bracket and the horizontal mounting plate of the present invention;

[0042] Figure 8 is a side view of the attapulgite filter material module of the present invention;

[0043] Figure 9 It is a structural schematic diagram of the buckle frame of the present invention.

[0044] Among them, 1-reaction wall body, 10-horizontal mounting plate, 11-first mounting frame, 110-first mounting frame, 111-first snap-in recess, 12-second mounting frame, 120-second mounting frame, 121-rotating shaft, 122-rotating mounting frame, 123-second snap-in recess, 124-buffer support rod, 13-sedimentation injection well, 130-aeration pipe, 131-microporous aeration head, 14-buffer sliding port, 2-front guide wall, 3-rear guide wall, 4-attached rod filter material module, 40-snap-in frame, 41-elastic metal mesh, 42-attached rod filter material bag, 5-porous guide plate. DETAILED DESCRIPTION

[0045] In order to further understand the content of the present invention, the present invention is described in detail below through examples.

[0046] Example 1: Figure 1 、 2 As shown, a attapulgite-based permeable reaction wall for repairing a halogenated hydrocarbon contaminated site comprises a reaction wall body 1 perpendicular to the water flow direction, a front guide wall 2 provided at the water inlet of the reaction wall body 1, a rear guide wall 3 provided at the water outlet of the reaction wall body 1 and symmetrically distributed with the front guide wall 2, and a plurality of attapulgite filter material modules 4 installed on the reaction wall body 1;

[0047] The reaction wall body 1 includes horizontal mounting plates 10 parallel to the front and rear sides of the river bank, four first mounting frames 11 and four second mounting frames 12 vertically mounted between the two horizontal mounting plates 10 and parallel to each other, and each first mounting frame 11 is staggered with each second mounting frame 12.

[0048] like Figure 3 、 4 As shown in Figures 5 and 6, the first mounting frame 11 is composed of six first mounting frames 110 that are staggered end to end and form a wave-like structure, and the side walls of the first mounting frames 110 are provided with first engaging recesses 111. The second mounting frame 12 is composed of six second mounting frames 120 that are staggered end to end and form a wave-like structure, and the inclination angles of the second mounting frames 120 on the same second mounting frame 12 are symmetrically distributed with the inclination angles of the first mounting frames 110 on the adjacent first mounting frames 11. A rotating mounting frame 122 is connected to the second mounting frame 120 via a rotating shaft 121, and a second engaging recess 123 is provided on the side walls of the rotating mounting frame 122.

[0049] Several attapulgite filter material modules 4 are respectively installed at each first clamping recess 111 and each second clamping recess 123;

[0050] like Figure 8 、 9 As shown, the attapulgite filter material module 4 includes two buckling frames 40 that are relatively distributed and hinged at the bottom ends, an elastic metal mesh 41 is installed on the side walls of the buckling frames 40, and a attapulgite filter material bag 42 is placed between the two buckling frames 40. The upper ends of the two buckling frames 40 are buckled with each other, and the two buckling frames 40 that are hinged to each other at the bottom ends and buckled at the upper ends serve as external support members, and an elastic metal mesh 41 is installed on the side walls of each buckling frame 40, and the attapulgite filter material bag 42 is placed in the space between the two buckling frames 40. When water flows through the attapulgite filter material bag 42 for processing, the two buckling frames 40 can protect the internal attapulgite filter material bag 42, and can effectively prevent the filter material from being lost due to the scouring of the water flow. At the same time, the elastic metal mesh 41 can produce elastic deformation to a certain extent as the pressure of the water flow changes. At the same time, the buckling frame 40 ensures the stability of the overall structure, so that the attapulgite filter material bag 42 can be effectively protected under different working conditions.

[0051] The surface of the attapulgite filter bag 42 is coated with a corrosion-resistant grid. The material of the attapulgite filter bag 42 is a mixture of attapulgite, nano-zero-valent iron and activated carbon in a mass ratio of 4:2:1. The corrosion-resistant grid coated on the surface can protect the attapulgite, nano-zero-valent iron and activated carbon inside the attapulgite filter bag 42, and further prevent them from being lost or failing due to factors such as water erosion and chemical corrosion during long-term use. At the same time, attapulgite, nano-zero-valent iron and activated carbon are all environmentally friendly materials. During use, they can absorb organic matter and some halogenated hydrocarbons in water without causing secondary pollution, and are environmentally friendly.

[0052] Example 2: This example discloses a method for repairing a halogenated hydrocarbon contaminated site, based on the attapulgite-based permeable reaction wall for repairing a halogenated hydrocarbon contaminated site in Example 1, comprising the following steps:

[0053] S1, the contaminated water at the halogenated hydrocarbon contaminated site flows through the front guide wall 2, and the contaminated water is guided to flow into the reaction wall body 1 through the front guide wall 2;

[0054] S2: The polluted water first flows through the first first mounting frame 11, and the attapulgite filter material modules 4 installed on the first mounting frames 110 that are staggered and arranged end to end to form a wave-like structure perform a first adsorption and degradation of organic matter and some halogenated hydrocarbons in the polluted water;

[0055] S3. When the water body that has completed the first adsorption and degradation passes through the first second mounting frame 12 and the six second mounting frames 120 that are staggered and arranged end to end to form a wave-like structure, the rotating mounting frame 122 rotates under the impact of the water flow. On the one hand, the attapulgite filter material module 4 on the rotating mounting frame 122 adsorbs and degrades organic matter and some halogenated hydrocarbons in the local water body. On the other hand, the rotating mounting frame 122 can accelerate the flow rate of the water body.

[0056] S4, after the water passes through the first second mounting rack 12, it enters the second first mounting rack 11 again, and again undergoes a second adsorption and degradation of organic matter and some halogenated hydrocarbons in the water by the attapulgite filter material modules 4 installed on the first mounting frames 110 that are staggered end to end and form a wave-like structure. The water that has completed the second adsorption and degradation flows through the second second mounting rack 12, and the contents of step S3 are repeated. While adsorbing and degrading organic matter and some halogenated hydrocarbons in the local water, the water is accelerated to flow into the third first mounting rack 11;

[0057] S5, repeat step S4 until the water flows through the last first mounting rack 11, completes several adsorption and degradation of organic matter and some halogenated hydrocarbons in the water, and then flows out through the last second mounting rack 12, and the outflow of the water is guided;

[0058] In steps S2 to S5 , the attapulgite filter material modules 4 at each first engaging recess 111 and each second engaging recess 123 are replaced every four months.

[0059] Example 3: This example differs from Example 1 in that:

[0060] like Figure 1 、 2 As shown, a sediment injection well 13 is provided at the water inlet of the reaction wall body 1 and at the lower end of the front guide wall 2. The inner wall of the sediment injection well 13 is provided with 5 vertically arranged aeration pipes 130, and each aeration pipe 130 is provided with 8 microporous aeration heads 131. The function of the sediment injection well 13 is to collect sediment at the bottom of the water body to prevent it from directly entering the reaction wall body 1 and clogging the attapulgite filter material module 4, affecting the permeability. At the same time, an aeration pipe 130 with a microporous aeration head 131 is provided on the inner wall of the sediment injection well 13, and compressed air is released from the bottom to generate an ascending bubble flow, which drives the water in the sediment injection well to generate a vertical convection circulation to achieve effective mixing of the sediment water and the surface water, which can maintain the sediment injection well. 13, inhibiting the activity of anaerobic microorganisms and reducing the generation of odor and the secondary release of pollutants. The aeration pipe 130 and the microporous aeration head 131 both adopt existing technologies. For example, the aeration pipe 130 can adopt existing UPVC pipes, ABS pipes, stainless steel pipes, etc., and the microporous aeration head 131 can adopt a 215-type diaphragm microporous aeration head. In actual applications, air is usually provided by an external blower, and compressed air is released into the sediment injection well 13 through the aeration pipe 130 and the microporous aeration head 131. The blower can adopt an existing power supply method, such as an external power supply or a solar power supply device, as long as it meets the use requirements, which will not be repeated here.

[0061] Example 4: This example differs from Example 2 in that:

[0062] In step 1, the contaminated water body at the halogenated hydrocarbon contaminated site collects sediments at the bottom of the water body in the sediment injection well 13. At the same time, an aeration pipe 130 with a microporous aeration head 131 is set on the inner wall of the sediment injection well 13. Compressed air is released from the bottom to generate an upward bubble flow, driving the water body in the sediment injection well to generate vertical convection circulation to achieve effective mixing of sediment water and surface water.

[0063] Example 5: This example differs from Example 3 in that:

[0064] like Figure 7As shown, buffer sliding openings 14 corresponding to the first mounting frame 11 and the second mounting frame 12 are respectively provided on opposite sides of the two horizontal mounting plates 10. The two first mounting frames 110 located at the end of the first mounting frame 11 are slidably connected to the corresponding buffer sliding openings 14, and the two second mounting frames 120 located at the end of the second mounting frame 12 are slidably connected to the corresponding buffer sliding openings 14.

[0065] The second mounting frames 120 located on the same second mounting frame 12 and spaced apart are connected to the first mounting frames 110 adjacent on the left and right sides by buffer support rods 124. While each first mounting frame 11 and each second mounting frame 12 slightly slides in the corresponding buffer sliding openings 14 on the horizontal mounting plate 10 to disperse and buffer the impact force of the water flow, the buffer support rods 124 also elastically support the first mounting frame 110 and the second mounting frame 120, thereby absorbing and dissipating part of the impact force of the water flow and improving the seismic resistance of the permeable reaction wall under the impact of water flow.

[0066] Example 6: This example differs from Example 4 in that:

[0067] In steps 2-4, when the water flows into the reaction wall body 1, under the impact force of the water flow, each first mounting frame 11 and each second mounting frame 12 can slide slightly in the corresponding buffer sliding opening 14 on the horizontal mounting plate 10, so that the impact force of the water flow is dispersed and buffered. The buffer support rod 124 also elastically supports the first mounting frame 110 and the second mounting frame 120, which can absorb and dissipate part of the impact force of the water flow.

[0068] Example 7: This example differs from Example 5 in that:

[0069] like Figure 1 、 2 As shown, the cross-sections of the front guide wall 2 and the rear guide wall 3 are trapezoidal or arc-shaped, the angle between the inclined surfaces of the front guide wall 2 and the rear guide wall 3 and the direction of water flow is 30°, and the front guide wall 2 and the rear guide wall 3 are both provided with inclined porous guide plates 5, and the hole diameter of the porous guide plates 5 is 5 mm, which further disperses the impact force of the water flow.

[0070] Example 8: This example differs from Example 7 in that:

[0071] The cross-sections of the front guide wall 2 and the rear guide wall 3 are trapezoidal or arc-shaped, and the angle between the inclined surfaces of the front guide wall 2 and the rear guide wall 3 and the direction of water flow is 60°. The front guide wall 2 and the rear guide wall 3 are both provided with inclined porous guide plates 5. The diameter of the holes of the porous guide plates 5 is 10 mm, which further disperses the impact force of the water flow.

[0072] Example 9: This example differs from Example 6 in that:

[0073] In step 1, the angle between the inclined surfaces of the front guide wall 2 and the rear guide wall 3 and the direction of the water flow is limited to reduce turbulence and evenly distribute the water flow. The porous guide plate 5 can further disperse the impact force of the water flow.

[0074] Example 10: This example differs from Example 9 in that:

[0075] In steps S2 to S5 , the attapulgite filter material modules 4 at each first engaging recess 111 and each second engaging recess 123 are replaced every five months.

Claims

1. A attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites, characterized in that: The invention comprises a reaction wall body (1) distributed perpendicular to the water flow direction, a front guide wall (2) provided at the water flow inlet of the reaction wall body (1), a rear guide wall (3) provided at the water flow outlet of the reaction wall body (1) and distributed symmetrically with the front guide wall (2), and a plurality of attapulgite filter material modules (4) installed on the reaction wall body (1); The reaction wall body (1) comprises horizontal mounting plates (10) parallel to the front and rear sides of the river bank, a plurality of first mounting frames (11) and a plurality of second mounting frames (12) vertically mounted between the two horizontal mounting plates (10) and parallel to each other, and each first mounting frame (11) and each second mounting frame (12) are staggered. The first mounting frame (11) is composed of a plurality of first mounting frames (110) staggered and arranged end to end to form a wave-shaped structure, and the side wall of the first mounting frame (110) is provided with a first clamping recess (111); the second mounting frame (12) is composed of a plurality of second mounting frames (120) staggered and arranged end to end to form a wave-shaped structure, and the inclination angles of the second mounting frames (120) on the same second mounting frame (12) are symmetrically distributed with the inclination angles of the first mounting frames (110) on the adjacent first mounting frame (11); a rotating mounting frame (122) is connected to the second mounting frame (120) via a rotating shaft (121), and the side wall of the rotating mounting frame (122) is provided with a second clamping recess (123); Several attapulgite filter material modules (4) are respectively installed at each of the first clamping recesses (111) and each of the second clamping recesses (123).

2. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 1, characterized in that: A sedimentation injection well (13) is provided at the water inlet of the reaction wall body (1) and located directly below the front guide wall (2). The inner wall of the sedimentation injection well (13) is provided with a plurality of vertically arranged aeration pipes (130), and each of the aeration pipes (130) is provided with a plurality of microporous aeration heads (131).

3. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 1, characterized in that: Buffer sliding openings (14) corresponding to the first mounting frame (11) and the second mounting frame (12) are respectively provided on opposite sides of the two horizontal mounting plates (10); the two first mounting frames (110) located at the end of the first mounting frame (11) are slidably connected to the corresponding buffer sliding openings (14); and the two second mounting frames (120) located at the end of the second mounting frame (12) are slidably connected to the corresponding buffer sliding openings (14).

4. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 3, characterized in that: Each of the second mounting frames (120) located on the same second mounting frame (12) and spaced apart is connected to the first mounting frames (110) adjacent to the left and right sides via a buffer support rod (124).

5. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 1, characterized in that: The attapulgite filter material module (4) comprises two buckling frames (40) that are relatively distributed and hinged at their bottom ends, an elastic metal mesh (41) installed on the side walls of the buckling frames (40), and a attapulgite filter material bag (42) placed between the two buckling frames (40), wherein the upper ends of the two buckling frames (40) are buckled with each other.

6. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 5, characterized in that: The surface of the attapulgite filter material bag (42) is coated with a corrosion-resistant grid, and the material of the attapulgite filter material bag (42) is a mixture of attapulgite, nano zero-valent iron and activated carbon in a mass ratio of 4:2:

1.

7. The attapulgite-based permeable reactive wall for repairing halogenated hydrocarbon contaminated sites according to claim 1, characterized in that: The cross-sections of the front guide wall (2) and the rear guide wall (3) are trapezoidal or arc-shaped, and the angle between their inclined surfaces and the direction of water flow is 30°-60°. The front guide wall (2) and the rear guide wall (3) are both provided with inclined porous guide plates (5) inside, and the hole diameter of the porous guide plates (5) is 5-10 mm.

8. A method for repairing a halogenated hydrocarbon contaminated site, comprising: a attapulgite-based permeable reactive wall for repairing a halogenated hydrocarbon contaminated site according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the contaminated water at the halogenated hydrocarbon contaminated site flows through the front guide wall (2), and the contaminated water is guided by the front guide wall (2) to flow into the reaction wall body (1); S2, the polluted water first flows through the first first installation frame (11), and the organic matter and some halogenated hydrocarbons in the polluted water are first adsorbed and degraded by the attapulgite filter material modules (4) installed on each first installation frame (110) that is staggered and arranged end to end to form a wave-shaped structure; S3, when the water body that has completed the first adsorption and degradation flows through the first second mounting frame (12), and passes through a plurality of second mounting frames (120) that are staggered and arranged end to end to form a wave-shaped structure, the rotating mounting frame (122) rotates under the impact of the water flow. On the one hand, the attapulgite filter material module (4) on the rotating mounting frame (122) adsorbs and degrades organic matter and some halogenated hydrocarbons in the local water body. On the other hand, the rotating mounting frame (122) can accelerate the flow rate of the water body; S4, after the water body passes through the first second mounting frame (12), it enters the second first mounting frame (11) again, and again undergoes a second adsorption and degradation of organic matter and some halogenated hydrocarbons in the water body through the attapulgite filter material modules (4) installed on the first mounting frames (110) that are staggered and arranged end to end and form a wave-shaped structure. The water body that has completed the second adsorption and degradation flows through the second second mounting frame (12) and repeats the content of step S3, while adsorbing and degrading the organic matter and some halogenated hydrocarbons in the local water body, accelerating the water body to flow into the third first mounting frame (11); S5. Repeat step S4 until the water flows through the last first mounting rack (11) and completes several adsorption and degradation of organic matter and some halogenated hydrocarbons in the water. The water then flows out through the last second mounting rack (12) and the outflow of the water is guided.

9. The method for remediating a halogenated hydrocarbon contaminated site according to claim 8, wherein: In steps S2-S5, the attapulgite filter material modules (4) at each of the first clamping recesses (111) and each of the second clamping recesses (123) are replaced every 4-5 months.

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