A combined remediation device and method for vadose zone soil in contaminated sites

Abstract

This invention belongs to the field of soil and groundwater pollution remediation technology, specifically relating to a combined remediation device and method for vadose zone soil in contaminated sites. It includes at least four swing arms and a sampling and remediation mechanism located at the end of each swing arm. The sampling and remediation mechanism is perpendicular to the ground and includes a drilling section and a sampling monitoring system. The drilling section includes a longitudinal remediation chamber and a sample chamber inside, a telescopic sampling component located at the center of the remediation chamber, and several injection components located on the sidewalls of the remediation chamber. The telescopic sampling component transports soil samples to the sample chamber. After monitoring and analyzing the soil samples through the sampling monitoring system, monitoring results are generated. Based on the monitoring results, a remediation agent is injected into the contaminated vadose zone soil. This invention provides an in-situ remediation device and method that does not require moving the soil, offering high flexibility. The injection depth and injection pressure can be adjusted according to the soil pollution level in the vadose zone, enabling targeted remediation of soil layers in different spatial longitudinal or transverse directions.

Description

Technical Field

[0001] This invention belongs to the field of soil and groundwater pollution remediation technology, specifically relating to a combined remediation device and method for vadose zone soil in contaminated sites. Background Technology

[0002] Above the groundwater level, the soil is not saturated with water and exists as a three-phase system containing soil particles, water, and air, known as the vadose zone. Below the groundwater level, the soil is saturated with water and exists as a two-phase system consisting of soil particles and water, known as the saturated zone and water-saturated zone. Due to the different environments in polluted areas, different pollutants diffuse or migrate to different depths below the soil surface. Sampling depths for vadose zone pollution surveys are generally 25–80 cm below the ground surface.

[0003] Current technologies for treating vadose zone contamination often employ in-situ drilling, which involves drilling equipment to treat the contaminated area without disturbing the soil, thereby reducing the migration and diffusion of pollutants. However, in in-situ drilling, when injecting remediation agents into the contaminated soil via a grouting system, existing remediation equipment struggles to target specific longitudinal or transverse soil layers due to the varying sizes of contaminant areas at different depths within the vadose zone. Furthermore, the presence of solid phases in the contaminated soil leads to uneven treatment, limiting remediation efficiency and resulting in high operating costs. Summary of the Invention

[0004] The purpose of this invention is to provide a combined remediation device and method for vadose zone soil in contaminated sites, in order to solve the problems mentioned in the background art.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] In a first aspect, the present invention provides a combined remediation device for vadose zone soil in contaminated sites, comprising a fixing part disposed on a movable device, and further comprising:

[0007] At least four swing arms and a sampling and repair mechanism at the end of each swing arm. The front end of the swing arm is hinged to the upper end face of the fixed part. The upper end face of the fixed part is provided with a drive mechanism for driving the swing arm to rotate around its hinge point.

[0008] The sampling and repair mechanism is perpendicular to the ground. The sampling and repair mechanism includes a lifting slide, a fixed frame that moves along the lifting slide, a drilling part installed in the fixed frame, a motor installed on the side of the fixed frame for driving the drilling part to rotate, and a sampling and monitoring system installed on the top of the fixed frame.

[0009] The drilling section includes a longitudinal repair cavity and a sample cavity inside it, a telescopic sampling component located at the center of the repair cavity, and several injection components located on the side wall of the repair cavity.

[0010] The telescopic sampling component delivers soil samples to the sample chamber. The soil samples are monitored and analyzed by the sampling monitoring system to generate monitoring results. Based on the monitoring results, the injection component is controlled to inject remediation agent into the contaminated vadose zone soil.

[0011] Furthermore, the lifting slide is provided with a lifting drive component, which is used to drive the fixed frame to move longitudinally along the lifting slide.

[0012] Furthermore, the motor output end is provided with a first gear, and the top of the fixing frame is provided with a second gear that meshes with the first gear. The second gear is used to drive the drilling part to rotate.

[0013] Furthermore, the drive mechanism includes an electric telescopic component disposed on the upper end face of the fixed part and a sliding plate component disposed on the output end of the electric telescopic component. A top rod is vertically disposed on the sliding plate component, and the front ends of the two swing arms are hinged to both ends of the top rod through connecting rods.

[0014] Furthermore, the upper end face of the fixing part is provided with a pressure part, and the pressure part is provided with two piston plates, the ends of which extend to the outside of the pressure part and are fixedly connected to the sliding plate.

[0015] The drilling section is provided with a second pressurizing section, which is connected to the cavity between the two piston plates in the first pressurizing section. The second piston plate is movably provided in the second pressurizing section, and a guide rod is fixedly provided at one end of the second piston plate. The end of the guide rod extends to the outside of the second pressurizing section and is fixedly provided with a fixing sleeve corresponding to the number of injection components.

[0016] The injection assembly includes an injection chamber fixed to the inner wall of the repair cavity by a mounting bracket. A piston plate three is movably disposed in the injection chamber. One end of the piston plate three extends to the outside of the injection chamber and is hinged to the fixed sleeve by a connecting rod. An injection head inclined below the repair cavity is connected to the end of the injection chamber away from the piston plate three.

[0017] Furthermore, the upper end face of the fixing part is provided with a repair fluid tank, the drilling part is provided with a transfer box that communicates with the repair fluid tank, a plurality of injection chambers are connected with a liquid guide pipe, the liquid guide pipe is connected with the transfer box, the connection between the liquid guide pipe and the injection chamber is located between the piston plate and the injection head, and a pressure relief valve is provided at the connection between the injection chamber and the injection head.

[0018] Secondly, the present invention proposes a method for the combined remediation of vadose zone soil at contaminated sites, implemented based on the aforementioned remediation device, the method comprising:

[0019] S1. The fixed part is placed on the contaminated site by the movable device, the drive mechanism is controlled to drive the swing arms to form a set angle between each other, and the fixed frame on the upgrade slide is controlled to move so that the drilling part abuts the target drilling ground.

[0020] S2. Control the telescopic sampling component inside the repair cavity to take samples at different depths of the target drilled ground, transport the soil samples to the sample cavity, and generate monitoring results after monitoring and analyzing the soil samples through the sampling monitoring system;

[0021] S3. Based on the monitoring results, control the drilling depth of the drilling unit into the corresponding vadose zone, and inject the remediation agent into the contaminated vadose zone soil through the injection component 200.

[0022] Compared with existing technologies, the advantages of the solution provided by this invention are as follows:

[0023] 1. This invention provides an in-situ remediation device and method that does not require moving the soil. It is highly flexible and can adjust the injection depth and injection pressure according to the soil pollution level in the vadose zone, so as to achieve targeted remediation of soil layers in different spatial longitudinal or transverse directions.

[0024] 2. In this invention, the repair device pressurizes the injection chamber during the sampling process before repair. Compared with other injection repair methods, the pressurized repair agent is easier to inject into the vadose zone when targeting the solid phase. This device does not require other electrically controlled pressurizing components and has a lower cost. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a cross-sectional structural diagram of the connection between the pressure part, the sliding plate, and the electric telescopic part in this invention.

[0027] Figure 3 This is a schematic diagram of the sampling and repair mechanism in this invention.

[0028] Figure 4 This is a schematic diagram of the internal structure of the drilling section in this invention.

[0029] Figure 5 This is a schematic diagram of the injection component in this invention.

[0030] Figure 6 This is a schematic diagram of the process by which the swing arm drives the sampling and repair mechanism to move in this invention.

[0031] Figure 1-6In the middle section: 100, fixing part; 110, controller; 120, swing arm; 121, infusion tube; 130, sampling and repair mechanism; 131, lifting slide; 132, fixing frame; 133, lifting drive component; 134, drilling part; 135, motor; 136, gear one; 137, gear two; 138, bracket; 139, sampling and monitoring system; 140, pressurizing part one; 141, piston plate one; 150, sliding plate component; 160, electric telescopic component; 170. Top rod; 180. Repair fluid tank; 190. Connecting rod; 200. Injection assembly; 201. Mounting bracket; 202. Injection chamber; 203. Connecting rod; 204. Piston plate three; 205. Injection head; 1341. Repair chamber; 1342. Telescopic sampling component; 1343. Sample chamber; 1344. Pressurization section two; 1345. Transfer box; 1346. Piston plate two; 1347. Guide rod; 1348. Fixing sleeve; 1349. Fluid guide tube. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0033] Example 1

[0034] like Figure 1-6 As shown, this embodiment proposes a combined remediation device for vadose zone soil of contaminated sites, including a fixed part 100 mounted on a movable device, and further including: at least four swing arms 120, and a sampling and remediation mechanism 130 disposed at the end of each swing arm 120. The front end of each swing arm 120 is hinged to the upper end face of the fixed part 100, and the upper end face of the fixed part 100 is provided with a drive mechanism for driving the swing arm 120 to rotate around its hinge point; the sampling and remediation mechanism 130 is perpendicular to the ground, and includes a lifting slide 131, a fixed frame 132 that moves along the lifting slide 131, a drilling part 134 disposed within the fixed frame 132, and a drilling part 134 disposed within the fixed frame 132. The mounting frame 132 includes a motor 135 on its side for driving the rotation of the drilling section 134, and a sampling and monitoring system 139 on its top. The drilling section 134 includes a longitudinal remediation chamber 1341 and a sample chamber 1343 inside it, a telescopic sampling member 1342 located at the center of the remediation chamber 1341, and several injection components 200 located on the side wall of the remediation chamber 1341. The telescopic sampling member 1342 transports soil samples to the sample chamber 1343. After monitoring and analyzing the soil samples through the sampling and monitoring system 139, monitoring results are generated. Based on the monitoring results, the injection components 200 are controlled to inject remediation agent into the contaminated vadose zone soil.

[0035] Combination Figure 1In this embodiment, the driving mechanism can drive two adjacent swing arms 120 to form a set angle, and then control the drilling part 134 on the sampling and remediation mechanism 130 to move along the lifting slide 131 to the ground of the sampling point. The telescopic sampling member 1342 at the center of the remediation cavity 1341 is used to sample and monitor the vadose zone at different depths of the sampling point. Then, based on the monitoring results obtained by the sampling and monitoring system 139, that is, the soil pollution status of the vadose zone at the sampling point, the injection component 200 is controlled to inject the remediation agent into the polluted vadose zone soil.

[0036] It is understood that in this embodiment, the telescopic sampling component 1342 can be a telescopic soil sampler, and the sampling monitoring system 139 includes sensors for detecting soil pollution in the vadose zone and data analysis equipment. Furthermore, the remediation agent can be a chemical agent, microbial agent, etc., used for remediating vadose zone soil.

[0037] It should be noted that before the injection assembly 200 injects the remediation agent into the contaminated vadose zone soil, the present invention also includes driving the drilling part 134 downward as a whole. During this process, the telescopic sampling member 1342 is in a fully retracted state, and then the remediation cavity 1341 in the drilling part 134 is filled with vadose zone soil before the remediation agent is injected.

[0038] Combination Figure 3 Further preferably, the lifting slide 131 is provided with a lifting drive component 133, which is used to drive the fixed frame 132 to move longitudinally along the lifting slide 131; for example, the lifting drive component 133 can be a cylinder, hydraulic cylinder, electric push rod, linear motor or lead screw drive component, etc., mainly used to drive the lifting of the fixed frame 132.

[0039] Combination Figure 3 In a further preferred embodiment, the output end of the motor 135 is provided with a gear 136, and the top of the fixing frame 132 is provided with a gear 137 that meshes with the gear 136. The gear 137 is used to drive the drilling part 134 to rotate.

[0040] In this embodiment, the motor 135 drives the drilling section 134 to rotate, and in conjunction with the lifting drive component 133, the drilling section 134 rotates downward to the depth where the repair agent needs to be injected before the repair is performed.

[0041] Combination Figures 1-5More preferably, the drive mechanism includes an electric telescopic member 160 (similar in type to the lifting drive member 133 described above) disposed on the upper end face of the fixed part 100, and a sliding plate member 150 disposed on the output end of the electric telescopic member 160. A top rod 170 is vertically disposed on the sliding plate member 150, and the front ends of the two swing arms 120 are hinged to both ends of the top rod 170 through a connecting rod 190. The upper end face of the fixing part 100 is provided with a pressure part 140. Two piston plates 141 are provided inside the pressure part 140, with the ends of the two piston plates 141 extending to the outside of the pressure part 140 and fixedly connected to the sliding plate 150. A second pressure part 1344 is provided inside the drilling part 1344. The second pressure part 1344 communicates with the cavity between the two piston plates 141 in the pressure part 140. A second piston plate 1346 is movably disposed inside the second pressure part 1344. A guide rod 1347 is fixedly provided at one end of the second piston plate 1346. The end extends to the outside of the second pressurizing part 1344 and is fixedly provided with a fixed sleeve 1348 corresponding to the number of injection components 200; the injection component 200 includes an injection cavity 202 fixed to the inner wall of the repair cavity 1341 by a mounting bracket 201, a piston plate 204 is movably provided in the injection cavity 202, one end of the piston plate 204 extends to the outside of the injection cavity 202 and is hinged to the fixed sleeve 1348 by a connecting rod 203, and an injection head 205 inclined below the repair cavity 1341 is connected to the end of the injection cavity 202 away from the piston plate 204.

[0042] In a further preferred embodiment, the upper end face of the fixing part 100 is provided with a repair fluid tank 180, the drilling part 134 is provided with a transfer box 1345 that communicates with the repair fluid tank 180, a plurality of injection chambers 202 are connected with a liquid guide pipe 1349, the liquid guide pipe 1349 communicates with the transfer box 1345, the connection between the liquid guide pipe 1349 and the injection chamber 202 is located between the piston plate 204 and the injection head 205, and a pressure relief valve is provided at the connection between the injection chamber 202 and the injection head 205.

[0043] The fixing part 100 of the present invention is also provided with a controller 190, which is used to control the operation of the electric telescopic component 160, the lifting drive component 133, the motor 135, and the pressure relief valve.

[0044] In practice, after completing the above-mentioned multiple sampling of the soil sample (during the sampling process, the angle between the two swing arms needs to be adjusted multiple times via the drive component, such as...), Figure 6 The two swing arms on the left and right sides gradually move closer together, and the two piston plates 141 in the drive section move closer together to gradually pressurize the second pressure section 1344. According to the monitoring results, the controller 190 controls the drilling section 134 to move down to the depth to be repaired. Based on the pressure value of the second pressure section 1344 after pressurization, the controller controls the pressure relief valve to release the pressure. Under the action of the pressure value, the repair agent in the injection chamber 202 is injected into the soil to be repaired through the injection head 205.

[0045] According to an embodiment of the present invention, when multiple soil samples are taken in the target area, the pressurization part 140 and the pressurization part 1344 are gradually pressurized by a drive assembly, and the remediation agent is injected into the remediation area by the pressure after the pressurization is applied.

[0046] In some embodiments, after one sampling, such as Figure 1 The four sampling and remediation mechanisms 130 of the remediation equipment detected very low pollutant levels in the vadose zone of the target area, indicating that the pollution level within the range of the four sampling and remediation mechanisms 130 in the target area is low. This allows for a reduction in the number of samplings, resulting in smaller angle changes between the two swing arms 120 and a smaller pressure amplitude of the drive assembly on the pressurization section 140. Consequently, the driving force during remediation agent injection is smaller, making the amount of injected remediation agent more consistent with the pollutant level in the target area.

[0047] It is understood that, in this invention, after the injection chamber 202 is pressurized, the pressure is released through the pressure relief valve and the repair agent can be injected in multiple times based on the level of contaminants.

[0048] This embodiment also proposes a method for the combined remediation of vadose zone soil at contaminated sites, implemented based on the aforementioned remediation device, and the method includes:

[0049] S1. The fixed part 100 is placed on the contaminated site by the movable device, the drive mechanism is controlled to drive the swing arms 120 to form a set angle between each other, and the fixed frame 132 on the upgrade slide 131 is controlled to move so that the drilling part 134 comes into contact with the target drilling ground.

[0050] S2. The telescopic sampling component 1342 inside the control repair cavity 1341 takes samples at different depths of the target drilling ground, transports the soil samples to the sample cavity 1343, and generates monitoring results after monitoring and analyzing the soil samples through the sampling monitoring system 139.

[0051] S3. Based on the monitoring results, control the drilling depth of the drilling section 134 into the corresponding depth of the vadose zone, and inject the remediation agent into the contaminated vadose zone soil through the injection component 200.

[0052] It will be apparent to those skilled in the art that the embodiments of the present invention are not limited to the details of the exemplary embodiments described above, and that the embodiments of the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the embodiments of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the embodiments of the present invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be encompassed within the embodiments of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units, modules, or devices recited in the system, apparatus, or terminal claims may also be implemented by the same unit, module, or device through software or hardware. The terms "first," "second," etc., are used to indicate names and do not indicate any particular order.

[0053] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A combined remediation device for vadose zone soil at contaminated sites, comprising a fixing part (100) mounted on a movable device, characterized in that, Also includes: At least four swing arms (120) and a sampling and repair mechanism (130) provided at the end of each swing arm (120). The front end of the swing arm (120) is hinged to the upper end face of the fixed part (100). The upper end face of the fixed part (100) is provided with a driving mechanism for driving the swing arm (120) to rotate around its hinge point. The sampling and repair mechanism (130) is perpendicular to the ground. The sampling and repair mechanism (130) includes a lifting slide (131), a fixed frame (132) that moves along the lifting slide (131), a drilling part (134) located in the fixed frame (132), a motor (135) located on the side of the fixed frame (132) and used to drive the drilling part (134) to rotate, and a sampling monitoring system (139) located on the top of the fixed frame (132). The drilling section (134) includes a longitudinal repair cavity (1341) and a sample cavity (1343) inside it, a telescopic sampling component (1342) located at the center of the repair cavity (1341), and a number of injection components (200) located on the side wall of the repair cavity (1341). The telescopic sampling component (1342) transports the soil sample to the sample chamber (1343), and the soil sample is monitored and analyzed by the sampling monitoring system (139) to generate monitoring results. Based on the monitoring results, the injection component (200) is controlled to inject remediation agent into the contaminated vadose zone soil. The drive mechanism includes an electric telescopic member (160) disposed on the upper end face of the fixed part (100) and a sliding plate member (150) disposed on the output end of the electric telescopic member (160). A top rod (170) is vertically disposed on the sliding plate member (150). The front ends of the two swing arms (120) are hinged to both ends of the top rod (170) through a connecting rod (190). The upper end face of the fixing part (100) is provided with a pressure part (140), and the pressure part (140) is provided with two piston plates (141), the ends of the two piston plates (141) extend to the outside of the pressure part (140) and are fixedly connected to the sliding plate (150); The drilling section (134) is provided with a second pressurizing section (1344), which is connected to the cavity between the two piston plates (141) in the first pressurizing section (140). The second piston plate (1346) is movably provided in the second pressurizing section (1344), and a guide rod (1347) is fixedly provided at one end of the piston plate (1346). The end of the guide rod (1347) extends to the outside of the second pressurizing section (1344) and is fixedly provided with a fixing sleeve (1348) corresponding to the number of injection components (200). The injection assembly (200) includes an injection chamber (202) fixed to the inner wall of the repair cavity (1341) by a mounting bracket (201). A piston plate (204) is movably disposed in the injection chamber (202). One end of the piston plate (204) extends to the outside of the injection chamber (202) and is hinged to the fixing sleeve (1348) by a connecting rod (203). An injection head (205) inclined below the repair cavity (1341) is connected to the end of the injection chamber (202) away from the piston plate (204).

2. The combined remediation device for vadose zone soil of a contaminated site according to claim 1, characterized in that: The lifting slide (131) is provided with a lifting drive (133), which is used to drive the fixed frame (132) to move longitudinally along the lifting slide (131).

3. The combined remediation device for vadose zone soil of a contaminated site according to claim 1, characterized in that: The output end of the motor (135) is provided with a gear one (136), and the top of the fixed frame (132) is provided with a gear two (137) that meshes with the gear one (136). The gear two (137) is used to drive the drilling part (134) to rotate.

4. The combined remediation device for vadose zone soil of a contaminated site according to claim 1, characterized in that: The upper end face of the fixed part (100) is provided with a repair fluid tank (180), and the drilling part (134) is provided with a transfer box (1345) that communicates with the repair fluid tank (180). A plurality of injection chambers (202) are connected with a liquid guide pipe (1349). The liquid guide pipe (1349) is connected to the transfer box (1345). The connection between the liquid guide pipe (1349) and the injection chamber (202) is located between the piston plate three (204) and the injection head (205). A pressure relief valve is provided at the connection between the injection chamber (202) and the injection head (205).

5. A method for co-remediation of vadose zone soil at a contaminated site, implemented based on the co-remediation apparatus described in any one of claims 1-4, characterized in that, The methods include: S1. The fixed part (100) is placed on the contaminated site by the movable device, and the drive mechanism is controlled to drive the swing arms (120) to form a set angle between each other. The fixed frame (132) on the lifting slide (131) is controlled to move so that the drilling part (134) abuts against the target drilling ground. S2. The telescopic sampling component (1342) inside the control repair cavity (1341) takes samples at different depths of the target drilling ground, and transports the soil samples to the sample cavity (1343). The soil samples are monitored and analyzed by the sampling monitoring system (139) to generate monitoring results. S3. Based on the monitoring results, control the drilling section (134) to drill into the corresponding depth of the vadose zone, and inject the remediation agent into the contaminated vadose zone soil through the injection component (200).

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