Groundwater remediation agent release device and method

Abstract

This invention belongs to the field of groundwater remediation technology, specifically disclosing a groundwater remediation agent release device and method. The agent release device includes a sleeve, a sealing component, a piston, and an agent release pipe. The sleeve has a water intake chamber and a mixing chamber. The water intake chamber is divided into a first inlet chamber and a first outlet chamber and equipped with a one-way valve. The sealing component forms a closed cavity between the shaft and the sleeve and is divided into a second inlet chamber and a second outlet chamber. The piston slides back and forth in the mixing chamber, drawing groundwater downwards and discharging the mixed liquid upwards. The agent release pipe synchronously adds the agent along with the piston. This invention achieves active pumping, forced mixing, and directional reinjection through piston drive, solving problems such as uneven mixing, agent enrichment, and remediation blind spots in traditional remediation methods. The water flow path is closed and controllable, the addition is precise and adjustable, the structure is highly integrated, easy to install, and highly adaptable, significantly improving agent utilization and in-situ groundwater remediation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of groundwater remediation technology, and specifically relates to a groundwater remediation agent release device and method. Background Technology

[0002] In-situ chemical remediation has become the mainstream technology for groundwater pollution control due to its rapid effectiveness and wide applicability. The in-situ addition and release of chemicals are the core factors determining the remediation effect; however, existing addition devices and processes generally suffer from poor adaptability, uneven mixing, and low control precision, severely limiting remediation efficiency and engineering application results.

[0003] Traditional groundwater remediation agents are mainly administered by gravity injection, direct pressure injection, or simple well injection. Once the agent enters the aquifer, it relies solely on natural diffusion and concentration gradient migration, which cannot form forced mixing. This easily leads to localized enrichment of the agent and remediation blind spots, resulting in insufficient degradation of pollutants, prolonged remediation cycles, and increased engineering costs.

[0004] For example, Chinese invention patent CN118221196B proposes a groundwater remediation agent release device. This device uses an inlet pump to pump water into the lowest release chamber to dissolve the remediation agent blocks, and then discharges the dissolved agent for application. However, this device relies solely on the passive dissolution of the agent blocks by water flow, lacking a forced stirring and dynamic mixing mechanism. This makes it difficult for the agent to mix thoroughly with the contaminated groundwater, leading to incomplete degradation and uneven remediation. Another example is a groundwater remediation agent delivery device CN116553653B, which uses aeration to rupture a sealed membrane and release the agent. While this allows for some control over the release timing, it still relies on natural groundwater seepage to dissolve the agent, lacking active mixing and directional delivery. This also results in defects such as localized agent accumulation, incomplete contamination plume coverage, and remediation blind spots. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a groundwater remediation agent release device and method.

[0006] The technical solution of the present invention is: a groundwater remediation agent release device, comprising a sleeve, a sealing component, a piston, and an agent release pipe.

[0007] The sleeve is a cylindrical structure that is closed at one end and open at the other end. When in use, the sleeve is placed in the vertical shaft with the opening facing upwards. The sleeve has two horizontal partitions inside, which together with the closed end of the sleeve form an adjacent water intake chamber and a mixing chamber from top to bottom. The water intake chamber is equipped with a vertical partition, which divides the water intake chamber into a first water inlet chamber and a first water outlet chamber. The interior of the first water inlet chamber and the first water outlet chamber are connected to the mixing chamber, and a valve body is provided at each connection point.

[0008] The sealing component includes two first sealing components and two second sealing components; the two first sealing components are arranged at intervals along the axial direction of the outer wall of the sleeve, and the two first sealing components form a longitudinal closed cavity with the sleeve in the vertical shaft; the two second sealing components are set in the longitudinal closed cavity, dividing the closed cavity into a second water inlet cavity and a second water outlet cavity, the second water inlet cavity is connected to the first water inlet cavity, and the second water outlet cavity is connected to the first water outlet cavity.

[0009] The piston is slidably positioned inside the mixing chamber. The piston is connected to an external drive device via a connecting rod, which drives the piston to slide within the mixing chamber. When the piston moves downward, groundwater enters the mixing chamber from the vertical shaft through the second outlet chamber and the first inlet chamber. When the piston moves upward, the groundwater in the mixing chamber is discharged through the first outlet chamber and the second outlet chamber.

[0010] The drug release tube is located inside the connecting rod, with one end connected to an external drug supply device and the other end used to add repair drugs to the mixing chamber located above the piston.

[0011] Furthermore, it also includes a vertical shaft pipe and a horizontal shaft pipe installed inside the vertical shaft. The vertical shaft pipe is coaxial with the sleeve. The first sealing element is an annular structure that fills the annular gap between the vertical shaft pipe and the sleeve. The second sealing element is a rectangular structure that fills the space between the vertical shaft pipe and the sleeve along the direction perpendicular to the groundwater flow. The second water inlet chamber is distributed in the direction of groundwater flow, and the second water outlet chamber is in the direction of groundwater flow.

[0012] There are two horizontal well pipes. When in use, the two horizontal well pipes are distributed opposite each other on both sides of the vertical well pipe along the direction of groundwater flow. One horizontal well pipe is located on the side of the vertical well pipe facing the direction of groundwater flow, and one end of the horizontal well pipe is connected to the second water inlet chamber. The other horizontal well pipe is located on the side of the vertical well pipe against the direction of groundwater flow, and one end of the horizontal well pipe is connected to the second water outlet chamber.

[0013] Furthermore, the axes of the two horizontal well pipes are located on the same straight line.

[0014] Furthermore, the angle between the axis of the horizontal well pipe and the horizontal line is 5° to 15°, and the horizontal height of the side of the horizontal well pipe closer to the water-facing end is higher than the horizontal height of the side opposite to the groundwater flow direction.

[0015] Furthermore, the horizontal well pipe is provided with perforated slots on its sidewalls. These perforated slots are used for groundwater to enter and exit the horizontal well pipe, and are distributed on the sidewall sections of the horizontal well pipe away from the vertical well pipe.

[0016] Furthermore, the sleeve includes a sleeve body and an adjusting arc plate slidably disposed on the sleeve body. The sleeve body has an arc groove at the height of the water inlet chamber. There are two arc grooves, which correspond one-to-one with the positions of the first water inlet chamber and the first water outlet chamber, respectively. Multiple first water inlet holes are arranged on the arc groove. There are two adjusting arc plates, which are slidably disposed one-to-one on the arc groove. Each adjusting arc plate has multiple second water inlet holes with the same structure as the first water inlet holes and corresponding one-to-one. The second water inlet holes and the first water inlet holes form a water inlet channel. The first water inlet chamber is connected to the second water inlet chamber through the water inlet channel, and the first water outlet chamber is connected to the second water outlet chamber through the water inlet channel. An adjusting rod is provided on the adjusting arc plate. The adjusting rod passes through the sleeve body. The adjusting rod drives the adjusting arc plate to slide on the arc groove, thereby adjusting the effective overlap area between the second water inlet hole and the first water inlet hole to adjust the effective passage area of ​​the water inlet channel.

[0017] Furthermore, the transverse partition near the closed end of the sleeve is provided with two through holes, which are respectively located in the first inlet chamber and the first outlet chamber; the valve body includes a cover plate, a connecting rod, and a limiting ring, the cover plate being connected to the limiting ring via the connecting rod, and the outer diameters of both the cover plate and the limiting ring being larger than the diameter of the through holes; the cover plate of the valve body controlling the communication between the first inlet chamber and the mixing chamber is located below the through holes, and the limiting ring of the valve body is located above the through holes; the cover plate of the valve body controlling the communication between the first outlet chamber and the mixing chamber is located above the through holes, and the limiting ring of the valve body is located below the through holes.

[0018] Furthermore, the valve body also includes a compression spring, which is arranged between the limiting ring and the transverse partition. One end of the compression spring is fixed to the transverse partition, and the other end is fixed to the limiting ring. In the initial state, the compression spring causes the cover plate to be tightly pressed against the transverse partition to seal the through hole, thereby achieving one-way water stop, preventing backflow of water, and ensuring stable pressure and mixing effect in the mixing chamber.

[0019] A method for releasing groundwater remediation agents, comprising the steps described above, using the agent release device to release the remediation agent into groundwater: Drilling creates a vertical shaft; a casing is placed inside the shaft, and a first sealing element is installed below the height of the groundwater to be repaired. Two second sealing elements are installed perpendicular to the direction of groundwater flow, and another first sealing element is installed above the second sealing elements. A connecting rod drives a piston to move within the mixing chamber. When the piston moves downward, groundwater enters the mixing chamber from the shaft through the second outlet chamber and the first inlet chamber. During this process, repair agents are added to the mixing chamber through the agent release pipe. When the piston moves upward, the groundwater in the mixing chamber is discharged through the first outlet chamber and the second outlet chamber.

[0020] Furthermore, the amount of repair agent added to the mixing chamber by the agent release tube is based on formula... Calculate; where, This indicates the dosage per unit time, expressed in mg / min. Indicates the drug ratio coefficient, mg / L; This indicates the pumping volume of the mixing chamber in a single stroke, expressed in L / stroke. This indicates the piston's operating frequency, in cycles per minute.

[0021] The drug ratio coefficient is based on the formula ;in, This indicates the molar / mass ratio of the reaction between the reagent and the contaminant; This indicates the initial concentration of pollutants in groundwater, in mg / L. This indicates the required concentration after repair, in mg / L.

[0022] Compared with existing technologies, the advantages of this invention are as follows: This invention utilizes a sleeve, sealing element, piston, and agent release pipe in synergy to construct a closed, directional, and controllable groundwater remediation agent release system within a vertical shaft. The system boasts a rational structure and outstanding practicality. The sleeve contains a water intake chamber and a mixing chamber. The water intake chamber is divided into a first inlet chamber and a first outlet chamber by a vertical partition, achieving unidirectional water flow control in conjunction with the valve body. Structurally, it prevents backflow and cross-contamination, ensuring stable and reliable operation. The sealing element forms a longitudinally closed cavity between the vertical shaft and the sleeve, further divided into a second inlet chamber and a second outlet chamber. This ensures that the water flow strictly circulates along a preset path, preventing disordered agent diffusion and significantly improving agent utilization.

[0023] The piston, driven by a connecting rod, slides back and forth, pumping water downwards and refilling upwards, achieving active pumping, forced disturbance, and dynamic mixing. This changes the traditional passive diffusion mode and solves problems such as uneven mixing, local enrichment, and repair blind spots. The agent release pipe adds the agent synchronously with the piston, and pumping and agent addition are carried out simultaneously. Mixing and agent release are matched in real time, greatly improving the uniformity of mixing and the sufficiency of the reaction.

[0024] The device is highly integrated and easy to install, requiring no complex auxiliary structures. It is highly adaptable to downhole conditions and operates stably. It can efficiently achieve the directional, uniform, and precise release of in-situ remediation agents, significantly improving the groundwater remediation effect and engineering economy. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 yes Figure 1 Enlarged view at point A; Figure 3 This is a top sectional view of the present invention; Figure 4 This is a partial structural schematic diagram of the sleeve of the present invention; Figure 5 This is an exploded view of the adjusting arc plate and sleeve of the present invention; Figure 6 This is a partial structural schematic diagram of the water intake cavity of the present invention; Figure 7 This is a flow diagram of groundwater during the operation of this invention; Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0026] Among them, 1-vertical shaft, 10-longitudinal closed cavity, 101-second water inlet cavity, 102-second water outlet cavity, 11-vertical shaft pipe, 12-horizontal shaft pipe, 2-sleeve, 20-arc groove, 200-first water inlet hole, 201-water inlet cavity, 202-mixing cavity, 203-first water inlet cavity, 204-first water outlet cavity, 21-horizontal diaphragm, 201-through hole, 22-vertical diaphragm, 23-adjusting arc plate, 230-second water inlet hole, 231-adjusting rod, 3-sealing component, 31-first sealing component, 32-second sealing component, 4-piston, 40-connecting rod, 5-valve body, 51-cover plate, 52-connecting rod, 53-limiting ring. Detailed Implementation

[0027] The following is combined Figures 1 to 8 The specific embodiments of the present invention will be described in detail below. In the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] It should be noted that the circuit connections involved in this invention all adopt conventional circuit connection methods and do not involve any innovation.

[0030] Example 1 like Figure 1 , Figure 2 , Figure 3 As shown, a groundwater remediation agent release device includes a sleeve 2, a sealing component 3, a piston 4, and an agent release pipe.

[0031] The sleeve 2 is a cylindrical structure with one end closed and the other end open. When in use, the sleeve 2 is placed inside the vertical shaft 1 with the opening facing upward. In addition, a through hole is provided at the closed end of the sleeve 2. The sleeve 2 is provided with two horizontal partitions 21. The two horizontal partitions 21 and the closed end of the sleeve 2 form adjacent water inlet chamber 201 and mixing chamber 202 from top to bottom. The water inlet chamber 201 is provided with a vertical partition 22, which divides the water inlet chamber 201 into a first water inlet chamber 203 and a first water outlet chamber 204. The interior of the first water inlet chamber 203 and the first water outlet chamber 204 are connected to the mixing chamber 202, and a valve body is provided at each connection point.

[0032] The sealing component 3 includes two first sealing components 31 and two second sealing components 32; the two first sealing components 31 are arranged at intervals along the axial direction of the outer wall of the sleeve 2, and the two first sealing components 31 form a longitudinal closed cavity 10 in the vertical shaft 1 and the sleeve 2; the two second sealing components 32 are arranged in the longitudinal closed cavity 10, dividing the closed cavity 10 into a second water inlet cavity 101 and a second water outlet cavity 102. The second water inlet cavity 101 is connected to the first water inlet cavity 203, and the second water outlet cavity 102 is connected to the first water outlet cavity 204.

[0033] Piston 4 is slidably disposed within mixing chamber 202. Piston 4 is connected to an external drive device via connecting rod 40, which drives piston 4 to slide within mixing chamber 202. When piston 4 moves downward, groundwater enters mixing chamber 202 from shaft 1 through second outlet chamber 102 and first inlet chamber 203. When piston 4 moves upward, groundwater in mixing chamber 202 is discharged through first outlet chamber 204 and second outlet chamber 102. It should be noted that when piston 4 moves upward within mixing chamber 202, the through hole is used to introduce air (or groundwater) into mixing chamber 202 located below piston 4 to balance the pressure in mixing chamber 202 located below piston 4. When piston 4 moves downward within mixing chamber 202, air (or groundwater) in mixing chamber 202 located below piston 4 is discharged through the through hole.

[0034] The agent release tube is located inside the connecting rod 40, with one end connected to an external agent supply device and the other end used to add repair agent to the mixing chamber 202 located above the piston 4. It should be noted that: Figure 6 As shown, in this embodiment, the piston 4 is provided with a discharge channel inside, and the upper surface of the piston 4 is provided with a discharge port that communicates with the discharge channel. The drug release tube passes through the connecting rod 40 and its lower end communicates with the discharge channel.

[0035] Through the coordinated operation of sleeve 2, sealing component 3, piston 4 and agent release pipe, a closed, directional and controllable groundwater remediation agent release system is constructed inside shaft 1, which has significant structural rationality and technical superiority.

[0036] The sleeve 2 is arranged in the vertical shaft 1 with one end closed and the other end open. The interior is divided by two horizontal partitions 21 to form a water inlet chamber 201 and a mixing chamber 202. The water inlet chamber 201 is further divided into a first water inlet chamber 203 and a first water outlet chamber 204 by a vertical partition 22. A valve body is installed at the connection position of the chambers so that the groundwater can only enter and exit the mixing chamber 202 in a single direction. This structurally prevents backflow of water and cross-contamination of the chambers, ensuring that the device operates stably and reliably.

[0037] The sealing component 3 consists of two first sealing components 31 and two second sealing components 32. The first sealing components 31 are arranged at intervals along the axial direction of the sleeve 2 to form a longitudinal closed cavity 10 between the shaft 1 and the sleeve 2. The second sealing components 32 further divide the longitudinal closed cavity 10 into a second water inlet cavity 101 and a second water outlet cavity 102, so that the groundwater and the chemical mixture are strictly confined to the circulation within the preset flow channel and will not spread disorderly to the non-repair area, effectively avoiding chemical waste and ineffective diffusion, and greatly improving the chemical utilization efficiency.

[0038] Piston 4 is driven by connecting rod 40 to slide back and forth in mixing chamber 202. When it moves downward, it creates negative pressure, which draws groundwater from shaft 1 into mixing chamber 202 located above piston 4 through second inlet chamber 101 and first inlet chamber 203. When it moves upward, it creates positive pressure, which pushes the mixture back into the aquifer through first outlet chamber 204 and second outlet chamber 102. Relying on piston drive, active pumping, forced disturbance, and dynamic mixing are achieved, which completely changes the passive state of traditional remediation that relies on natural diffusion and solves problems such as insufficient mixing of reagents and groundwater, excessively high local concentrations, and blind spots in remediation.

[0039] The agent release tube is built inside the connecting rod 40 and its end passes through the piston 4. It can move synchronously with the piston 4 and accurately add the remediation agent at the same time as the groundwater enters the mixing chamber 202. This achieves synchronization of water pumping and dosing, and synchronization of mixing and release, so that the agent and the polluted groundwater are matched and added according to the real-time water volume, thereby improving the mixing uniformity and reaction sufficiency.

[0040] The overall device has a high degree of integration, with each component closely fitted. It can be directly lowered into the vertical shaft 1 for installation without the need for additional complex auxiliary structures. It has strong adaptability to underground conditions, stable operation, and can efficiently complete the directional, uniform, and precise release of groundwater in-situ remediation agents.

[0041] Preferably, the system further includes a vertical shaft pipe 11 and a horizontal shaft pipe 12 installed inside the vertical shaft 1. The vertical shaft pipe 11 is coaxial with the sleeve 2. The first sealing member 31 is an annular structure that fills the annular gap between the vertical shaft pipe 11 and the sleeve 2. The second sealing member 32 is a rectangular structure that fills the space between the vertical shaft pipe 11 and the sleeve 2 along a direction perpendicular to the groundwater flow. The second water inlet chamber 101 is distributed in the direction of groundwater flow, and the second water outlet chamber 102 is distributed in the direction of groundwater flow. In actual use, this embodiment has a through hole for groundwater to enter on the side wall of the horizontal shaft pipe 12 away from the vertical shaft pipe 11.

[0042] There are two horizontal well pipes 12. When in use, the two horizontal well pipes 12 are distributed opposite each other on both sides of the vertical well pipe 11 along the direction of groundwater flow. One of the horizontal well pipes 12 is located on the side of the vertical well pipe 11 facing the direction of groundwater flow, and one end of the horizontal well pipe 12 is connected to the second water inlet chamber 101. The other horizontal well pipe 12 is located on the side of the vertical well pipe 11 against the direction of groundwater flow, and one end of the horizontal well pipe 12 is connected to the second water outlet chamber 102.

[0043] Based on the structural optimization of the vertical shaft pipe 11, horizontal shaft pipe 12, and sealing component 3, the sealing reliability, water flow directionality, and repair coverage of the device are significantly improved. The vertical shaft pipe 11 and the sleeve 2 are arranged coaxially, allowing the first sealing component 31 to uniformly fill the annular gap between the vertical shaft pipe 11 and the sleeve 2 in a ring structure, achieving circumferential full enclosure. The sealing effect is stable and the stress is uniform, effectively isolating longitudinal water flow and ensuring the sealing performance of the longitudinal closed cavity 10. The second sealing component 32 adopts a rectangular structure and is filled along the direction perpendicular to the groundwater flow. It can form a stable lateral partition between the vertical shaft pipe 11 and the sleeve 2, reliably dividing the longitudinal closed cavity 10 into a second inlet cavity 101 facing the water flow and a second outlet cavity 102 facing the water flow. Structurally, it achieves complete isolation between the inlet and outlet areas, avoiding water flow short-circuiting and premature diffusion of the agent. Two horizontal well pipes 12 are distributed opposite each other on both sides of the vertical well pipe 11 along the direction of groundwater flow. The horizontal well pipe 12 facing the water flow is connected to the second inlet chamber 101, which can directly collect undisturbed contaminated groundwater, ensuring that the water entering the mixing chamber 202 is representative. The horizontal well pipe 12 facing the water flow is connected to the second outlet chamber 102, which can directionally reinject the uniformly mixed reagent solution downstream of the aquifer, forming a directional flow field of "water intake facing the water flow and reagent release against the water flow", expanding the diffusion range and coverage area of ​​the reagent in the aquifer. This structure forms a complete directional path for groundwater extraction, reagent mixing, and solution reinjection, which not only improves mixing efficiency and remediation uniformity, but also precisely controls the direction of reagent migration, eliminates remediation blind spots, and significantly improves the in-situ remediation effect.

[0044] Preferably, the axes of the two horizontal well pipes 12 are located on the same straight line. Positioning the axes of the two horizontal well pipes 12 on the same straight line ensures that the horizontal well pipes 12 in the direction of water flow and the direction of water flow opposite are arranged in a straight line, maintaining a high degree of consistency with the natural seepage direction of groundwater. This structure can significantly reduce the overall flow resistance of groundwater entering the horizontal well pipe 12, flowing through the second inlet chamber 101 and the mixing chamber 202, and being discharged from the second outlet chamber 102, making the water flow path straighter and smoother, reducing local eddies and head loss, and improving the pumping and reinjection efficiency driven by the piston 4. Simultaneously, the straight-through arrangement ensures that the chemical mixture, after being discharged from the horizontal well pipe 12, diffuses linearly along the direction of groundwater flow, forming a stable and uniform chemical migration channel. This avoids water flow deviation, uneven chemical diffusion, and repair blind zones caused by misalignment of the horizontal well pipes 12, further expanding the repair influence range and improving the uniformity and effectiveness of in-situ repair.

[0045] Preferably, the sidewall of the horizontal well pipe 12 is provided with perforated slots for groundwater to enter and exit the horizontal well pipe 12. These perforated slots are distributed on the sidewall section of the horizontal well pipe 12 away from the vertical well pipe 11. Providing perforated slots on the sidewall of the horizontal well pipe 12 and arranging them on the sidewall section away from the vertical well pipe 11 significantly improves the coverage and uniformity of groundwater collection and reagent reinjection. The perforated slots provide multiple, decentralized entry and exit channels for groundwater in the aquifer, avoiding problems such as excessive local flow velocity and aquifer blockage caused by concentrated water inflow or outflow at a single point, thus ensuring long-term water flow stability. By placing the perforated slot on the side away from the shaft pipe 11, the water inlet and outlet positions can be closer to the far end of the polluted aquifer. On the one hand, this allows for more complete extraction of the original polluted groundwater far from shaft 1, improving the representativeness and authenticity of the water samples. On the other hand, the reagent mixture can be directly added to the deep and far end of the aquifer, expanding the radial diffusion distance and remediation coverage of the reagent in the aquifer. This effectively avoids the defects of reagent enrichment around shaft 1 and insufficient remediation at the far end, significantly improving the overall coverage and uniformity of the remediation.

[0046] Preferred, such as Figure 4 , Figure 5As shown, the sleeve 2 includes a sleeve body and an adjusting arc plate 23 slidably disposed on the sleeve body. The sleeve body has an arc groove 20 at the height of the water inlet chamber 201. There are two arc grooves 20, corresponding one-to-one with the positions of the first water inlet chamber 203 and the first water outlet chamber 204, respectively. Multiple first water inlet holes 200 are arranged on the arc grooves 20. There are two adjusting arc plates 23, each slidably disposed on the arc groove 20. Each adjusting arc plate 23 has multiple second water inlet holes 200 with the same structure as the first water inlet holes 200 and corresponding one-to-one with each other. 30. The second water inlet hole 230 and the first water inlet hole 200 form a water inlet channel. The first water inlet chamber 203 is connected to the second water inlet chamber 101 through the water inlet channel, and the first water outlet chamber 204 is connected to the second water outlet chamber 102 through the water inlet channel. An adjusting rod 231 is provided on the adjusting arc plate 23. The adjusting rod 231 passes through the sleeve body. The adjusting rod 231 drives the adjusting arc plate 23 to slide on the arc groove 20, thereby adjusting the effective overlapping area of ​​the second water inlet hole 230 and the first water inlet hole 200 to adjust the effective passage area of ​​the water inlet channel.

[0047] The sleeve 2 adopts an adjustable structure combining the sleeve body and the adjusting arc plate 23. An arc groove 20 and a first water inlet 200 are set at the corresponding position in the water inlet chamber 201, and together with the second water inlet 230 on the adjusting arc plate 23, an adjustable water inlet channel is formed. It can accurately, continuously, and steplessly adjust the inlet and outlet flow rates according to different hydrogeological conditions of aquifers. By driving the adjusting arc plate 23 to slide in the arc groove 20 through the adjusting rod 231, the effective overlapping area of ​​the first water inlet 200 and the second water inlet 230 is changed, thereby adjusting the effective flow cross-sectional area of ​​the water inlet channel in real time. This adapts to the pumping and reinjection needs of aquifers with different permeability coefficients (high, medium, and low), avoiding aquifer blockage due to excessive water inlet or low repair efficiency due to insufficient water inlet. This adjustment structure can complete downhole flow regulation without disassembling the device or lifting the sleeve 2. It is easy to operate, has good sealing performance, and high adjustment accuracy. It makes the water flow matching between the first water inlet chamber 203 and the second water inlet chamber 101, and between the first water outlet chamber 204 and the second water outlet chamber 102 stronger. It significantly improves the device's adaptability to different sites and geological conditions, ensures the stability and efficiency of the entire process of pumping, mixing and releasing drugs driven by the piston 4, and greatly expands the engineering application range of the device.

[0048] Preferred, such as Figure 6As shown, the transverse partition 21 near the closed end of the sleeve 2 is provided with two through holes 210, which are located in the first water inlet chamber 203 and the first water outlet chamber 204, respectively. The valve body includes a cover plate 51, a connecting rod 52, and a limiting ring 53. The cover plate 51 is connected to the limiting ring 53 through the connecting rod 52. The outer diameters of the cover plate 51 and the limiting ring 53 are both larger than the diameter of the through holes 210. The cover plate 51 of the valve body that controls the communication between the first water inlet chamber 203 and the mixing chamber 202 is located below the through holes 210, and the limiting ring 53 of the valve body is located above the through holes 210. The cover plate 51 of the valve body that controls the communication between the first water outlet chamber 204 and the mixing chamber 202 is located above the through holes 210, and the limiting ring 53 of the valve body is located below the through holes 210.

[0049] Two through holes 210 are provided on the transverse partition 21 near the closed end of the sleeve 2, and valve bodies with corresponding structures are configured for the first water inlet chamber 203 and the first water outlet chamber 204, respectively, which can realize stable water flow switching with strict unidirectional conduction, automatic opening and closing, and no power control. The valve body is composed of a cover plate 51, a connecting rod 52, and a limiting ring 53, and the outer diameters of the cover plate 51 and the limiting ring 53 are both larger than the diameter of the through holes 210, which can ensure that the opening and closing are in place and the sealing is reliable. The valve body controlling the connection between the first inlet chamber 203 and the mixing chamber 202 has a cover plate 51 positioned below the through hole 210 and a limiting ring 53 positioned above the through hole 210. It opens only when the piston 4 moves downward and creates negative pressure, allowing groundwater to enter the mixing chamber 202 in one direction. The valve body controlling the connection between the first outlet chamber 204 and the mixing chamber 202 has a cover plate 51 positioned above the through hole 210 and a limiting ring 53 positioned below the through hole 210. It opens only when the piston 4 moves upward and creates positive pressure, allowing the mixed liquid to be discharged in one direction. The two valve bodies are arranged in opposite directions and work in tandem, automatically switching between inlet and outlet water during the reciprocating motion of the piston 4. This eliminates the need for external control, electric drive, and crossflow or backflow, ensuring stable pressure and thorough mixing of the reagents within the mixing chamber 202, while also improving the stability and reliability of long-term downhole operation.

[0050] Preferably, the valve body also includes a compression spring, which is arranged between the limiting ring 53 and the transverse partition 21. One end of the compression spring is fixed to the transverse partition 21, and the other end is fixed to the limiting ring 53. In the initial state, the compression spring causes the cover plate 51 to be tightly attached to the transverse partition 21 to close the through hole 210.

[0051] A compression spring is added between the limiting ring 53 and the transverse partition 21. One end of the compression spring is fixed to the transverse partition 21, and the other end is fixed to the limiting ring 53. This allows the valve body to rely on the spring preload to tightly fit the cover plate 51 against the transverse partition 21 in the initial state, achieving a normally closed seal of the through hole 210. This structure can avoid the problems of premature leakage of reagents and water short circuit caused by the free flow of groundwater and the interconnection of chambers in the non-working state, ensuring the sealing performance during the start-up and shutdown of the device. When piston 4 moves downward to pump water or moves upward to drain water, the water pressure overcomes the spring force to automatically open the corresponding valve body, completing the water inlet or outlet action; when piston 4 stops moving or the pressure disappears, the compression spring quickly rebounds, causing cover plate 51 to immediately reset and seal through hole 210. The opening and closing response is faster, the sealing is more reliable, there is no lag, and there is no leakage. This effectively improves the accuracy of unidirectional water flow control and the pressure stability in mixing chamber 202, ensuring that the agent and groundwater are fully mixed in the closed chamber. At the same time, it greatly improves the sealing performance and service life of the valve body during long-term underground operation and reduces the probability of failure.

[0052] A method for releasing groundwater remediation agents, utilizing the agent release device proposed in this embodiment to release the remediation agent into groundwater, specifically includes the following steps: Step 1: Site Survey and Shaft 1 Construction Conduct hydrogeological surveys of the contaminated site to determine the groundwater level, flow direction, permeability coefficient, and pollutant distribution; drill wells to form a vertical shaft 1 at the designed depth, and install vertical shaft pipe 11 and horizontal shaft pipe 12 in the vertical shaft 1, so that the horizontal shaft pipe 12 is laid out in opposite directions along the groundwater flow direction, with the water-facing end being higher than the water-repelling end.

[0053] Step 2: Lowering Sleeve 2 and Installing Sealing Part 3 Slowly lower the sleeve 2 with its opening facing upwards to a predetermined depth inside the shaft 1, so that the sealed end is located at the aquifer to be repaired; install the first sealing element 31 in the annular gap between the shaft pipe 11 and the sleeve 2 below the aquifer to be repaired; arrange two second sealing elements 32 along the direction perpendicular to the groundwater flow to divide the longitudinal sealed cavity 10 into a second inlet cavity 101 and a second outlet cavity 102; install another first sealing element 31 above the second sealing element 32 to form a complete sealing structure.

[0054] Step 3: Connect the drive and drug supply system Connect piston 4's connecting rod 40 to the ground drive device, and connect the upper end of the drug release pipe to the external drug supply device; check the smoothness of piston 4's sliding, the sealing of the pipeline, and the initial closed state of the valve body.

[0055] Step 4: Pumping – Chemical Dosing – Mixing – Recharge Cycle The drive unit is activated, and the piston 4 is driven by the connecting rod 40 to move within the mixing chamber 202: When piston 4 moves downward, the mixing chamber 202 above piston 4 forms a negative pressure, the inlet valve opens and the outlet valve closes; groundwater enters the mixing chamber 202 above piston 4 through horizontal well pipe 12, second inlet chamber 101 and first inlet chamber 203; during this process, the agent is added synchronously through the agent release pipe, and forced mixing is achieved under the disturbance of the piston.

[0056] When piston 4 moves upward, the mixing chamber 202 above piston 4 forms positive pressure, the outlet valve body opens and the inlet valve body closes; the mixed liquid is directionally reinjected into the aquifer through the first outlet chamber 204, the second outlet chamber 102 and the horizontal well pipe 12.

[0057] In this process, according to the formula Calculate the dosage per unit time; where, This indicates the dosage per unit time, expressed in mg / min. Indicates the drug ratio coefficient, mg / L; This indicates the pumping capacity of mixing chamber 202 in a single stroke, in L / stroke; This indicates the working frequency of piston 4, in cycles / min.

[0058] The drug ratio coefficient is based on the formula ;in, This indicates the molar / mass ratio of the reaction between the reagent and the contaminant; This indicates the initial concentration of pollutants in groundwater, in mg / L. This indicates the required concentration after repair, in mg / L.

[0059] Step 5: Operation Monitoring and Well Sealing Real-time monitoring of groundwater pollutant concentration, water level, and remediation effect; once the water quality meets the standards, operation is stopped, surface equipment is dismantled, shaft 1 is sealed, and remediation is completed.

[0060] Example 2 Unlike Example 1, preferred embodiment, such as Figure 8As shown, the angle between the axis of the horizontal well pipe 12 and the horizontal line is 5° to 15°, and the horizontal height of the side of the horizontal well pipe 12 near the water-facing end is higher than the horizontal height of the side against the groundwater flow direction. Setting the angle between the axis of the horizontal well pipe 12 and the horizontal line to 5° to 15°, and making the horizontal height of the side near the water-facing end higher than the side against the groundwater flow direction, can assist the groundwater flow with the help of gravitational potential energy, significantly optimizing the water intake and reinjection efficiency of the device. This inclined structure can reduce the frictional resistance of groundwater entering the horizontal well pipe 12 from the aquifer and flowing to the second water intake chamber 101, reduce water flow stagnation and local air accumulation, and improve the smoothness and efficiency of water intake when the piston 4 pumps water; at the same time, when the chemical mixture is reinjected into the second water outlet chamber 102 and discharged into the horizontal well pipe 12, it can diffuse along the inclined pipe body to the far end of the aquifer, avoiding the accumulation of chemicals near the vertical well 1, and expanding the radial delivery distance of the chemicals and the repair coverage area. The tilt angle range of 5° to 15° balances water flow assistance and structural stability. It avoids the problem of insufficient gravity assistance due to an angle that is too small, and the problem of increased installation difficulty and pipe blockage risk due to an angle that is too large. It can significantly improve the water flow response speed and repair uniformity in low-permeability aquifers, and ensure the long-term stable operation of the device.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A groundwater remediation agent release device, characterized by, include: The sleeve is a cylindrical structure that is closed at one end and open at the other. When in use, the sleeve is placed in the vertical shaft with the opening facing upward. The sleeve has two horizontal partitions inside, which together with the closed end of the sleeve form an adjacent water intake chamber and a mixing chamber from top to bottom. The water intake chamber is equipped with a vertical partition, which divides the water intake chamber into a first water inlet chamber and a first water outlet chamber. The interior of the first water inlet chamber and the first water outlet chamber are connected to the mixing chamber, and a valve body is provided at each connection point. The sealing component includes: two first sealing components, which are arranged at intervals along the axial direction of the outer wall of the sleeve, and the two first sealing components form a longitudinal closed cavity in the shaft and the sleeve; two second sealing components are set in the longitudinal closed cavity, dividing the closed cavity into a second water inlet cavity and a second water outlet cavity, the second water inlet cavity being connected to the first water inlet cavity and the second water outlet cavity being connected to the first water outlet cavity; The piston is slidably disposed in the mixing chamber. The piston is connected to an external drive device through a connecting rod, which drives the piston to slide in the mixing chamber. When the piston moves downward, groundwater enters the mixing chamber from the vertical shaft through the second outlet chamber and the first inlet chamber. When the piston moves upward, the groundwater in the mixing chamber is discharged through the first outlet chamber and the second outlet chamber. The agent release tube is located inside the connecting rod. One end of it is connected to an external drug supply device, and the other end is used to add repair agent to the mixing chamber located above the piston.

2. A groundwater remediation reagent release device according to claim 1, wherein It also includes vertical shaft pipes and horizontal shaft pipes installed inside the vertical shaft. The vertical shaft pipes are coaxial with the sleeve. The first sealing element is a ring-shaped structure that fills the annular gap between the vertical shaft pipe and the sleeve. The second sealing element is a rectangular structure that fills the space between the vertical shaft pipe and the sleeve along the direction perpendicular to the groundwater flow. The second water inlet chamber is distributed in the direction of groundwater flow, and the second water outlet chamber is distributed in the direction of groundwater flow. There are two horizontal well pipes. When in use, the two horizontal well pipes are distributed opposite each other on both sides of the vertical well pipe along the direction of groundwater flow. One of the horizontal well pipes is located on the side of the vertical well pipe facing the direction of groundwater flow, and one end of the horizontal well pipe is connected to the second water inlet chamber. The other horizontal well pipe is located on the side of the vertical well pipe against the direction of groundwater flow, and one end of the horizontal well pipe is connected to the second water outlet chamber.

3. A groundwater remediation reagent release device as claimed in claim 2, wherein The axes of the two horizontal well pipes are located on the same straight line.

4. A groundwater remediation reagent releasing apparatus according to claim 2, wherein The angle between the axis of the horizontal well pipe and the horizontal line is 5° to 15°, and the horizontal height of the side of the horizontal well pipe closer to the water-facing end is higher than the horizontal height of the side opposite to the groundwater flow direction.

5. A groundwater remediation reagent releasing apparatus according to claim 2, wherein The horizontal well pipe has perforated slots on its sidewalls. These perforated slots are used for groundwater to enter and exit the horizontal well pipe. The perforated slots are distributed on the sidewall sections of the horizontal well pipe that are away from the vertical well pipe.

6. A groundwater remediation reagent releasing apparatus according to claim 1, wherein The sleeve includes a sleeve body and an adjusting arc plate slidably disposed on the sleeve body. The sleeve body is provided with an arc groove at the height of the water inlet cavity. There are two arc grooves, which correspond one-to-one with the positions of the first water inlet cavity and the first water outlet cavity, and a plurality of first water inlet holes are arranged on the arc grooves. There are two adjusting arc plates, which are slidably arranged on the arc groove in a one-to-one correspondence. Each adjusting arc plate has multiple second water inlets with the same structure as the first water inlet and corresponding to it. The second water inlets and the first water inlets form a water inlet channel. The first water inlet chamber is connected to the second water inlet chamber through the water inlet channel, and the first water outlet chamber is connected to the second water outlet chamber through the water inlet channel. An adjusting rod is provided on the adjusting arc plate, which passes through the sleeve body. The adjusting rod drives the adjusting arc plate to slide on the arc groove, thereby adjusting the effective overlap area between the second water inlet and the first water inlet to adjust the effective passage area of ​​the water inlet channel.

7. A groundwater remediation reagent release device as claimed in claim 1, wherein Two through holes are provided on the transverse partition near the closed end of the sleeve, and the two through holes are respectively located in the first water inlet chamber and the first water outlet chamber; the valve body includes a cover plate, a connecting rod and a limiting ring, the cover plate is connected to the limiting ring through the connecting rod, and the outer diameter of the cover plate and the limiting ring are both larger than the diameter of the through holes; the cover plate of the valve body that controls the communication between the first water inlet chamber and the mixing chamber is located below the through holes, and the limiting ring of the valve body is located above the through holes; the cover plate of the valve body that controls the communication between the first water outlet chamber and the mixing chamber is located above the through holes, and the limiting ring of the valve body is located below the through holes.

8. The groundwater remediation agent release device as described in claim 7, characterized in that, The valve body also includes a compression spring, which is arranged between the limiting ring and the transverse partition. One end of the compression spring is fixed to the transverse partition, and the other end is fixed to the limiting ring. In the initial state, the compression spring causes the cover plate to be tightly attached to the transverse partition to close the through hole.

9. A method for releasing a groundwater remediation agent, characterized in that, The process of releasing the remediation agent into groundwater using the agent release device described in claim 1 specifically includes the following steps: Drilling creates a vertical shaft; The sleeve is placed into the vertical shaft, and the first sealing element is installed below the height of the groundwater to be repaired. Two second sealing elements are installed perpendicular to the direction of groundwater flow. Then, another first sealing element is installed above the second sealing elements. The piston is driven by a connecting rod to move within the mixing chamber. When the piston moves downward, groundwater enters the mixing chamber from the vertical shaft through the second outlet chamber and the first inlet chamber. During this process, a repair agent is added to the mixing chamber through the agent release pipe. When the piston moves upward, the groundwater in the mixing chamber is discharged through the first outlet chamber and the second outlet chamber.

10. A method for releasing groundwater remediation agents as described in claim 9, characterized in that, The amount of repair agent added to the mixing chamber by the agent release tube is based on the formula... Calculate; where, This indicates the dosage per unit time, expressed in mg / min. Indicates the drug ratio coefficient, mg / L; This indicates the pumping volume of the mixing chamber in a single stroke, expressed in L / stroke. This indicates the piston's operating frequency, in cycles per minute. The drug ratio coefficient is based on the formula ;in, This indicates the molar / mass ratio of the reaction between the reagent and the contaminant; This indicates the initial concentration of pollutants in groundwater, in mg / L. This indicates the required concentration after repair, in mg / L.

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