In-situ chemical treatment apparatus and method for soil and groundwater remediation

Abstract

The application discloses the technical field of environmental remediation and relates to an in-situ chemical treatment device and method for soil and underground water remediation, which comprises a mixing device, conveying equipment and a support, the support is provided with a mounting plate and a driving piece for driving the mounting plate to ascend and descend, the mounting plate is provided with an injection assembly, the injection assembly comprises an injection head in communication with the conveying equipment and two cover bodies for covering the bottom end of the injection head, the injection head is provided with a driving assembly for driving the cover bodies to move, the bottom end of the injection head is covered by the two cover bodies, the outlet of the injection head is separated from the outside world, the soil cannot enter the inside of the injection head when the injection head is inserted into the soil, the injection head is prevented from being blocked, and the remediation efficiency is ensured.

Description

An in-situ chemical treatment device and method for soil and groundwater remediation Technical Field

[0001] This invention relates to the field of environmental remediation technology, specifically to an in-situ chemical treatment device and method for soil and groundwater remediation. Background Technology

[0002] With the rapid development of industrialization and urbanization, soil and groundwater pollution problems are becoming increasingly serious, especially the leakage and diffusion of heavy metals, organic pollutants (such as petroleum hydrocarbons, benzene compounds, polycyclic aromatic hydrocarbons, etc.) and recalcitrant chemicals, which pose a serious threat to the ecological environment and human health. In order to ensure that the remediation reagent can reach the pollution source directly and play its role in the most effective area, the injection head of the remediation reagent is usually inserted deep into the soil. However, in the process of inserting the injection head directly into the soil, since the outlet of the injection head is usually exposed to the outside, the soil is easily squeezed into the soil during the process of the injection head entering the soil, which leads to blockage of the injection head and affects the remediation efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an in-situ chemical treatment device and method for soil and groundwater remediation, in order to solve the problem mentioned in the background art, where, during the process of directly inserting the injection head into the soil, the outlet of the injection head is generally exposed to the outside, and the soil is easily squeezed into the soil during the process of the injection head entering the soil, resulting in the blockage of the injection head.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an in-situ chemical treatment device for soil and groundwater remediation, comprising: a mixing device, a conveying device, and a support;

[0005] The bracket is provided with a mounting plate and a drive component for driving the mounting plate to rise and fall; the mounting plate is provided with an injection assembly.

[0006] The injection assembly includes an injection head connected to a delivery device and two covers for covering the bottom of the injection head. The injection head is provided with a drive assembly for moving the covers.

[0007] Preferably, the side wall of the injection head is provided with two mounting holes, the driving assembly includes a push rod slidably disposed in the mounting hole and an elastic reset member connected to the push rod, a fixing member is provided between the two push rods, and the ends of the two push rods that are far apart from each other are respectively connected to two covers.

[0008] Preferably, the fixing component includes a kit, a mounting groove on the inner sidewall of the kit, a limiting block slidably disposed in the mounting groove, and an elastic element connected to the limiting block. The two push rods are a first push rod and a second push rod, the kit is fixedly disposed on the first push rod and sleeved on the outer wall of the second push rod, the inner sidewall of the second push rod is provided with a limiting groove, the limiting block is inserted into the limiting groove, the kit is provided with a slot, a moving block is slidably disposed in the slot, and a flexible connecting component is provided between the moving block and the limiting block.

[0009] Preferably, the injection head includes an upper tube and a lower tube. The upper tube is provided with an annular groove, and the lower tube is provided with an annular block for insertion into the annular groove. The outer side wall of the annular block and the inner side wall of the annular groove are both provided with threads.

[0010] Preferably, the injection head is provided with an airflow channel, and the mounting plate is provided with an air supply device for communicating with the airflow channel.

[0011] Preferably, the gas supply device includes a gas storage tank and a partition disposed inside the gas storage tank. The partition is used to divide the inner cavity of the gas storage tank into a first cavity and a second cavity that are interconnected. A piston plate and an elastic element connected to the piston plate are slidably disposed inside the first cavity. A moving rod is provided on the piston plate. The moving rod extends to the outside of the gas storage tank and is connected to a support plate. A through hole is provided on the side wall of the first cavity. An air outlet is provided on the second cavity for communicating with an airflow channel.

[0012] Preferably, the second cavity is provided with a first baffle and a second baffle for separating the first cavity and the second cavity, and the second baffle is slidably disposed in the second cavity;

[0013] The mounting plate is provided with a storage tank for communicating with the injection head. The storage tank is connected to the outlet of the delivery equipment. A movable plate located at the liquid inlet of the storage tank is slidably provided inside the storage tank. A connecting rod is provided between the movable plate and the second baffle.

[0014] Preferably, the in-situ chemical treatment device further includes a vehicle body, and the mixing device and conveying equipment are both mounted on the vehicle body.

[0015] Preferably, an in-situ chemical treatment method for soil and groundwater remediation, utilizing the aforementioned in-situ chemical treatment device for soil and groundwater remediation, includes the following steps:

[0016] S1: Raw materials are added to a mixing device and mixed to produce a repair solution;

[0017] S2: Place the bracket in the repair area, drive the mounting plate down through the drive unit, insert the injection component into the soil to the predetermined depth, drive the cover to move, expose the bottom of the injection head, and the delivery equipment works to inject the repair fluid inside the mixing device into the soil through the injection head to repair the soil and groundwater.

[0018] Compared with the prior art, the beneficial effects of the present invention are: by covering the bottom end of the injection head with two covers, the outlet of the injection head is isolated from the outside, ensuring that the soil will not enter the interior of the injection head when it is inserted into the soil, so that the injection head will not be blocked and the repair efficiency is guaranteed. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the in-situ chemical treatment device of the present invention;

[0020] Figure 2 is a schematic diagram of the connection structure between the bracket and the mounting plate of the present invention;

[0021] Figure 3 is a schematic cross-sectional view of the connection between the injection head and the cover of the present invention.

[0022] Figure 4 is an enlarged schematic diagram of the structure at point A in Figure 3 of this invention;

[0023] Figure 5 is an enlarged schematic diagram of the structure at point B in Figure 3 of this invention;

[0024] Figure 6 is a cross-sectional view of the connection between the push rod and the fixing component of the present invention.

[0025] Figure 7 is a cross-sectional view of the connection between the mounting plate and the storage tank of the present invention;

[0026] Figure 8 is a cross-sectional view of the gas storage tank of the present invention.

[0027] In the diagram: 1. Vehicle body; 2. Mixing device; 3. Conveying equipment; 4. Bracket; 5. Mounting plate; 6. Injection assembly; 61. Injection head; 611. Upper pipe fitting; 612. Lower pipe fitting; 613. Annular block; 614. Annular groove; 615. Airflow channel; 62. Cover; 63. Push rod; 631. Limiting groove; 64. Elastic reset component; 65. Fixing component; 651. Kit; 652. Slot; 653. Moving block; 654. Limiting block; 655. Flexible connector; 7. Storage tank; 8. Driving component; 9. Gas supply equipment; 91. Gas storage tank; 92. Moving rod; 93. Elastic component; 94. Partition plate; 95. Support plate; 96. Piston plate; 97. Through hole; 98. First baffle; 99. Second baffle; 10. Movable plate. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please refer to Figure 1. An in-situ chemical treatment device for soil and groundwater remediation includes: a vehicle body 1 (such as a mobile trolley), a mixing device 2 (including a mixing tank, a motor located on the top of the mixing tank, and stirring blades mounted on the output shaft of the motor, the stirring blades being located in the inner cavity of the mixing tank, the mixing tank including a tank body and a tank cover detachably connected to the tank body), a conveying device 3 (pump), and a support 4; the mixing device 2 is used to mix raw materials to prepare a remediation solution, and the mixing device 2 also stirs the remediation solution to ensure that the remediation solution does not precipitate;

[0031] It should be noted that the bracket 4 is clamped by the clamp on the top of the vehicle body 1, which is used to fix the unused bracket 4 to the vehicle body 1.

[0032] Please refer to Figures 1 and 2. A mounting plate 5 is slidably mounted on the bracket 4. A driving component 8 is mounted on the bracket 4. The driving component 8 includes a motor, a screw rod mounted on the output shaft of the motor, and a screw sleeve sleeved on the outer wall of the screw rod. The screw sleeve is slidably mounted on the bracket 4 and is connected to the mounting plate 5. The motor drives the screw rod to rotate, causing the screw sleeve to move the mounting plate 5 up or down.

[0033] Please refer to Figure 2. The mounting plate 5 is equipped with an injection assembly 6.

[0034] Referring to Figures 2 and 3, the injection assembly 6 includes an injection head 61 and two covers 62. The two covers 62 form a cylindrical component with a sealed bottom. The cylindrical component is fitted around the bottom of the outer wall of the injection head 61 to block the bottom outlet of the injection head 61. The injection head 61 is installed at the bottom of the mounting plate 5. The inlet of the injection head 61 is connected to the outlet of the delivery device 3 through a pipe. The injection head 61 is equipped with a drive assembly for driving the covers 62 to move.

[0035] It should be noted that the number of injection components 6 can be set according to actual needs, and there can be multiple components.

[0036] An in-situ chemical treatment method for soil and groundwater remediation includes the following steps:

[0037] First, the raw materials required for preparing the repair solution are added into the mixing device 2 and mixed to prepare the repair solution;

[0038] Second, the mixing device 2 and the support 4 are moved to the predetermined position by the moving vehicle 1, and the support 4 is fixed in the repair area. Then, the mounting plate 5 is driven down by the driving component 8 to insert the injection component 6 into the soil until the injection component 6 reaches the predetermined depth. The driving component drives the cover 62 to move, exposing the bottom end of the injection head 61. Then, the conveying device 3 works to inject the repair fluid inside the mixing device 2 into the soil through the injection head 61 to repair the soil and groundwater.

[0039] In this embodiment, as a further optimization, please refer to Figure 3. The driving component can be a telescopic device, such as a hydraulic cylinder. The moving end of the telescopic device is connected to the cover 62 to drive the cover 62 closer to or further away from the injection head 61. The driving component can also be another component, as detailed below:

[0040] Please refer to Figures 2, 3, 5, and 6. The drive assembly includes push rods 63, elastic reset elements 64 (springs), and fixing elements 65. Two mounting holes are provided on the left and right sidewalls of the injection head 61. Two push rods 63 are slidably inserted into the inner cavities of the two mounting holes (the push rods 63 and the mounting holes are sealed). The elastic reset elements 64 are installed between the push rods 63 and the mounting holes. The ends of the two push rods 63 that are far apart from each other are connected to two covers 62. A fixing element 65 is provided between the two push rods 63. The fixing element 65 includes a kit 651, a mounting groove on the inner sidewall of the kit 651, a limiting block 654 slidably disposed in the mounting groove, and an elastic element (spring) connected to the limiting block 654. The two push rods 63 are a first push rod and a second push rod, respectively. The kit 651 is fixed to the end of the first push rod and sleeved on the outer wall of the end of the second push rod. A limiting groove 631 is provided on the inner sidewall of the second push rod, and the limiting block 654 is inserted into the limiting groove 631. Inside the cavity, a slot 652 is provided on the top wall of the kit 651. A movable block 653 is slidably provided in the inner cavity of the slot 652 (the movable block 653 can move up and down, and the outer side wall of the movable block 653 is tightly fitted with the inner side wall of the slot 652 to achieve a sealing effect). A flexible connector 655 (such as a rope) is provided between the movable block 653 and the limiting block 654. After the injection component 6 is inserted into the soil to a predetermined depth, the conveying device 3 inputs the repair fluid from the mixing device 2 into the injection head 61. Since the cover 62 is not moved at this time, the repair fluid will stay inside the injection head 61, increasing the internal pressure of the injection head 61, which is used to squeeze the movable block 653, causing it to move and pull the flexible connector 655, moving the limiting block 654 out of the limiting groove 631, releasing the fixed connection between the kit 651 and the second push rod, thereby disconnecting the connection between the two push rods 63. Under the action of the elastic reset member 64, the push rod 63 moves outward with the cover 62 automatically.

[0041] It should be noted that the side of the limiting block 654 facing the second push rod is arc-shaped; when the cover 62 is pushed closer to the injection head 61, the two push rods 63 come together, so that the second push rod will contact the arc-shaped surface of the limiting block 654, which is used to push the limiting block 654 into the interior of the mounting groove, ensuring that the limiting block 654 will not prevent the two push rods 63 from coming together; after the limiting block 654 is aligned with the limiting groove 631, the elastic element pushes the limiting block 654 into the limiting groove 631, so that the fixing member 65 is connected to the second push rod, which is used to reset the cover 62.

[0042] In this embodiment, as a further optimization, please refer to Figures 3 and 4. The injection head 61 includes an upper tube 611 and a lower tube 612. The bottom end of the upper tube 611 is provided with an annular groove 614, and the top of the lower tube 612 is provided with an annular block 613. The annular block 613 is inserted into the inner cavity of the annular groove 614. The outer side wall of the annular block 613 and the inner side wall of the annular groove 614 are both provided with threads, and the threads of the two are matched with each other. By rotating the lower tube 612, the position of the annular block 613 in the inner cavity of the annular groove 614 is changed, so that the length of the injection head 61 can be adjusted according to the requirements.

[0043] Example 2

[0044] As a further optimization of Embodiment 1, please refer to Figures 2, 3, 4 and 5. An airflow channel 615 is provided inside the injection head 61, and an air blowing port is provided on the outer wall of the injection head 61. The air blowing port is connected to the airflow channel 615 and is located inside the cover 62. An air supply device 9 is provided on the mounting plate 5, and the air outlet of the air supply device 9 is connected to the airflow channel 615. When the air supply device 9 is working, it injects gas into the airflow channel 615, causing the air blowing port to blow air towards the cover 62, which is used to push the cover 62 away from the injection head 61, ensuring that the injection head 61 will disappear when blocked.

[0045] In this embodiment, as a further optimization, the gas supply device 9 can be an air pump; and the gas supply device 9 can also be configured in another way, as follows:

[0046] Please refer to Figures 2, 7, and 8. The gas supply device 9 includes a gas storage tank 91 and a partition 94 disposed within the inner cavity of the gas storage tank 91. The partition 94 divides the inner cavity of the gas storage tank 91 into a first cavity and a second cavity that are interconnected. A piston plate 96 is slidably disposed within the inner cavity of the first cavity. An elastic element 93 (spring) is disposed between the first cavity and the piston plate 96. A moving rod 92 is disposed at the bottom of the piston plate 96. The bottom end of the moving rod 92 extends to the outside of the gas storage tank 91 and is connected to a support plate 95. A through hole 97 is disposed on the side wall of the first cavity. The second cavity... An air outlet is provided on the top, which is connected to the airflow channel 615. When the mounting plate 5, carrying the injection assembly 6, moves down and is inserted into the soil, the support plate 95 will contact the ground and push the piston plate 96 upward, so that the piston plate 96 moves above the through hole 97, compressing the air inside the first chamber into the second chamber, and entering the airflow channel 615 through the air outlet for air supply. When the mounting plate 5 moves up and resets, the elastic member 93 pushes the piston plate 96 down to below the through hole 97, allowing outside air to enter the first chamber.

[0047] In this embodiment, as a further optimized solution, please refer to Figures 7 and 8. A first baffle 98 and a second baffle 99 are provided within the inner cavity of the second cavity. The first baffle 98 and the second baffle 99 separate the first cavity from the second cavity. The second baffle 99 is slidably disposed within the second cavity. A storage tank 7 is provided on the mounting plate 5. The storage tank 7 is connected to the inlet of the injection head 61 and the outlet of the delivery device 3, respectively. A movable plate 10 is slidably disposed within the inner cavity of the storage tank 7. A spring (for resetting the movable plate 10) is installed between the movable plate 10 and the storage tank 7. The movable plate 10 is located at the inlet of the storage tank 7. The movable plate 10 is connected to the second baffle 99 within the second cavity. A connecting rod is provided between the baffles 99; the first cavity and the second cavity are separated by the first baffle 98 and the second baffle 99, so that the piston plate 96 moves and will not immediately introduce compressed air into the airflow channel 615, thus avoiding the protective effect of the cover 62; when the conveying device 3 delivers the repair fluid inside the mixing device 2 into the injection head 61, the repair fluid will first enter the storage tank 7, and the repair will also push the movable plate 10 to move, so that the connecting rod moves the movable plate 10 to connect the first cavity and the second cavity. At this time, the compressed air inside the first cavity will enter the inner cavity of the airflow channel 615.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An in-situ chemical treatment device for soil and groundwater remediation, characterized in that: include: The mixing device (2), the conveying device (3), and the support (4) are provided. The support (4) is provided with a mounting plate (5) and a driving component (8) for driving the mounting plate (5) to rise and fall. The mounting plate (5) is provided with an injection assembly (6). The injection assembly (6) includes an injection head (61) connected to the conveying device (3) and two covers (62) for covering the bottom end of the injection head (61). The injection head (61) is provided with a driving component for driving the covers (62) to move. The side wall of the injection head (61) is provided with two mounting holes. The driving component includes a push rod (63) slidably disposed in the mounting hole and an elastic reset component (64) connected to the push rod (63). A fixed connection is provided between the two push rods (63). The fixing component (65) has two push rods (63) with their ends far apart connected to two covers (62) respectively. The fixing component (65) includes a kit (651), a mounting groove on the inner wall of the kit (651), a limiting block (654) slidably disposed in the mounting groove, and an elastic element connected to the limiting block (654). The two push rods (63) are a first push rod and a second push rod respectively. The kit (651) is fixedly disposed on the first push rod and sleeved on the outer wall of the second push rod. The inner wall of the second push rod is provided with a limiting groove (631). The limiting block (654) is inserted into the limiting groove (631). The kit (651) is provided with a slot (652). A moving block (654) is slidably disposed in the slot (652). 3) A flexible connector (655) is provided between the moving block (653) and the limiting block (654). The push rod (63) and the mounting hole are sealed. The outer wall of the moving block (653) and the inner wall of the slot (652) are tightly fitted to achieve a sealing effect. After the injection assembly (6) is inserted into the soil to a predetermined depth, the conveying device (3) inputs the repair fluid inside the mixing device (2) into the injection head (61). Since the cover (62) does not move at this time, the repair fluid will stay inside the injection head (61), increasing the pressure inside the injection head (61) to squeeze the moving block (653), causing it to move and pull the flexible connector (655), moving the limiting block (654) from the limiting groove (631). The fixed connection between the kit (651) and the second push rod is released, thereby disconnecting the connection between the two push rods (63). Under the action of the elastic reset member (64), the push rod (63) moves automatically outward with the cover (62). An airflow channel (615) is provided inside the injection head (61), and an air blowing port is provided on the outer side wall of the injection head (61). The air blowing port is connected to the airflow channel (615) and is located inside the cover (62). An air supply device (9) is provided on the mounting plate (5), and the air outlet of the air supply device (9) is connected to the airflow channel (615). When the air supply device (9) works, it injects gas into the airflow channel (615) and blows air into the cover (62) through the air blowing port, which is used to push the cover (62) away from the injection head (61).

2. The in-situ chemical treatment device for soil and groundwater remediation according to claim 1, characterized in that: The injection head (61) includes an upper tube (611) and a lower tube (612). The upper tube (611) is provided with an annular groove (614), and the lower tube (612) is provided with an annular block (613) for insertion into the annular groove (614). The outer side wall of the annular block (613) and the inner side wall of the annular groove (614) are both provided with threads.

3. The in-situ chemical treatment device for soil and groundwater remediation according to claim 1, characterized in that: The gas supply device (9) includes a gas storage tank (91) and a partition (94) disposed in the gas storage tank (91). The partition (94) is used to divide the inner cavity of the gas storage tank (91) into a first cavity and a second cavity that are interconnected. A piston plate (96) and an elastic element (93) connected to the piston plate (96) are slidably disposed in the first cavity. A moving rod (92) is provided on the piston plate (96). The moving rod (92) extends to the outside of the gas storage tank (91) and is connected to a support plate (95). A through hole (97) is provided on the side wall of the first cavity. An air outlet is provided on the second cavity for communicating with the airflow channel (615).

4. The in-situ chemical treatment device for soil and groundwater remediation according to claim 3, characterized in that: The second cavity is provided with a first baffle (98) and a second baffle (99) for separating the first cavity and the second cavity. The second baffle (99) is slidably disposed in the second cavity. The mounting plate (5) is provided with a storage tank (7) for communicating with the injection head (61). The storage tank (7) is connected to the outlet of the conveying device (3). A movable plate (10) located at the liquid inlet of the storage tank (7) is slidably disposed in the storage tank (7). A connecting rod is provided between the movable plate (10) and the second baffle (99).

5. The in-situ chemical treatment device for soil and groundwater remediation according to claim 1, characterized in that: The in-situ chemical treatment device also includes a vehicle body (1), and the mixing device (2) and the conveying equipment (3) are both located on the vehicle body (1).

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