Permeable reactive barrier for groundwater treatment

Abstract

The present application belongs to the technical field of underground sewage treatment, and provides a permeable reaction wall for underground water treatment, comprising: a wall frame, which is sequentially and spacedly provided with mutually-communicating filling cavities and operation cavities along the length direction, and the filling cavities are respectively provided with windows on both sides in the thickness direction of the wall frame; a filling assembly, which is arranged in the filling cavities and detachably connected with the wall frame, and the filling assembly is provided with a plurality of liquid-permeable channels in the thickness direction of the wall frame, and the liquid-permeable channels are communicated with the windows; and an operation assembly, which is arranged in the operation cavities and detachably connected with the wall frame, and the operation assembly is adapted to fill the filling assembly with medicaments or to dredge the filling assembly when the filling assembly is blocked. The detachable connection design of the wall frame, the filling assembly and the operation assembly makes the replacement of the filling material and the dredging of the wall more convenient, improves the efficiency, and the operation assembly is used to fill the necessary medicaments in the filling assembly, so that the reaction wall is not easy to be blocked.

Description

Technical Field

[0001] This invention belongs to the field of underground wastewater treatment technology, and specifically relates to a permeable reactive barrier for groundwater treatment. Background Technology

[0002] A permeable reactive barrier (PRB) is an underground wastewater treatment device used for in-situ removal of pollutants from groundwater and soil. A PRB consists of an underground wall made of activated material that intercepts pollutant plumes. As the pollutant plumes pass through a reaction medium, the pollutants are transformed into an environmentally acceptable form, thereby achieving the goal of bringing pollutant concentrations down to environmental standards.

[0003] Permeable reactive barriers used for groundwater treatment are typically installed at the depth of the aquifer and are usually concealed works. When applying this technology, a one-time chemical treatment and wall aggregate are primarily used for backfilling. Once the entire groundwater plume has flowed through the reactive barrier, all pollutants are reacted and removed, achieving the remediation goal.

[0004] In related technologies, the design of permeable reactive barriers for groundwater treatment has requirements on the permeability coefficient. As the service life of the reactive barrier increases, localized disturbances in the formation water flow or the scouring of fine particles from unstable formations into the reactive barrier area, as well as the accumulation of sediment or other insoluble substances in the aggregate pores of permeable reactive barriers primarily used for stabilization or sedimentation as the pollutant treatment volume increases, can all lead to blockage. Once blockage occurs, the entire reactive barrier usually needs to be replaced, resulting in a decrease in wastewater treatment efficiency. Summary of the Invention

[0005] In view of this, the present invention provides a permeable reactive barrier for groundwater treatment to solve the problem that reactive barriers in the prior art are prone to blockage over a long period of time, and require complete replacement after blockage, resulting in low sewage treatment efficiency.

[0006] This invention provides a permeable reactive wall for groundwater treatment, comprising: a wall frame having interconnected filling cavities and operating cavities arranged sequentially at intervals along its length, wherein the filling cavities have windows on both sides of the wall frame in the thickness direction; a filling assembly disposed in the filling cavity and detachably connected to the wall frame, the filling assembly having multiple permeable channels in the thickness direction of the wall frame, the permeable channels communicating with the windows; and an operating assembly disposed in the operating cavity and detachably connected to the wall frame, the operating assembly being adapted to fill the filling assembly with a reagent or to clear the blockage of the filling assembly when it is blocked.

[0007] In some alternative embodiments, the filling assembly includes a plurality of filling units, which are sequentially overlapped in the height direction of the wall frame, wherein each filling unit is provided with the plurality of liquid permeable channels.

[0008] In some alternative embodiments, the packing unit includes a packing skeleton and a protective mesh, the packing skeleton and the protective mesh forming a packing space adapted to be filled with a reaction medium, and the protective mesh forming a plurality of liquid permeation channels.

[0009] In some alternative embodiments, two adjacent packing skeletons have concave and convex structures that fit together, the convex structure having a lifting hole; and / or at least one partition mesh is provided in the packing space to divide the packing space into multiple subspaces.

[0010] In some optional embodiments, the operating component includes: an operating box having a first inlet and outlet; a first pipeline located at the top of the operating box, the first pipeline extending into the interior of the operating box, the first pipeline having a first opening opposite to the first inlet and outlet, such that the first opening communicates with the first inlet and outlet; and a first switch located at the top of the operating box, the first switch being adapted to open the first inlet and outlet, such that liquid flows between the filling cavity and the first pipeline through the first inlet and outlet and the first opening; or the first switch being adapted to close the first inlet and outlet.

[0011] In some alternative embodiments, the operating component further includes an observation tube disposed at the top of the operating box, the observation tube extending into the interior of the operating box and having an opening communicating with the first pipeline, so that liquid entering the first pipeline enters the observation tube.

[0012] In some optional embodiments, the wall frame corresponding to the operating cavity is provided with a permeation hole, the operating box is provided with a second inlet and outlet, the second inlet and outlet are arranged opposite to the permeation hole, and the second inlet and outlet are located on different sides of the operating box from the first inlet and outlet. The operating component further includes: a second pipeline, located at the top of the operating box, extending into the interior of the operating box, the second pipeline having a second opening, the second opening being opposite to the second inlet and outlet so that the second opening communicates with the second inlet and outlet; a second switch, located at the top of the operating box, the second switch being adapted to open the second inlet and outlet so that liquid flows between the filling cavity and the second pipeline through the second inlet and outlet and the second opening; or the second switch being adapted to close the second inlet and outlet.

[0013] In some optional embodiments, the first pipeline and the first switch are each provided in pairs, with the two first pipelines arranged opposite each other so that the first pipelines can communicate or disconnect with the filling cavities on the corresponding sides; and / or the wall frame corresponding to the operating cavity is provided with the permeation holes on opposite sides, and the second pipeline and the second switch are each provided in pairs, with the two second pipelines arranged opposite each other.

[0014] In some alternative embodiments, the permeable reactive wall for groundwater treatment further includes a flow guiding structure located at the bottom of the wall frame, the flow guiding structure being adapted to guide liquid to the wall frame.

[0015] In some alternative embodiments, the flow guiding structure includes a curtain with multiple grooves on its water-facing surface.

[0016] The beneficial effects of this invention are as follows: 1. The present invention, through the detachable connection design of the wall frame, filling component and operating component, makes the replacement of filling material and the unblocking of the wall more convenient and improves efficiency. The operating component is used to fill the filling component with necessary agents, so that the reaction wall is less likely to be blocked.

[0017] 2. The filling assembly consists of multiple detachable and connectable filling units. Each filling unit can independently contain the reaction medium, which enhances its adaptability to wastewater treatment. It can be quickly assembled, easy to construct, and supports various reaction methods, expanding the treatment range. It also allows for the convenient replacement of only the clogged filling unit while the other filling units can continue to be used, overcoming the shortcomings of existing reaction walls that require overall excavation and replacement for permeability repair and routine maintenance.

[0018] 3. By setting up an observation tube that can be connected to the first pipeline, the groundwater can be extracted through the observation tube, thus achieving the invention's purpose of observing the groundwater level and collecting samples within the permeable reactive wall.

[0019] 4. This invention can simultaneously meet the equipment requirements of methods such as chemical precipitation reaction grids, redox reaction grids, adsorption reaction grids, and biodegradation reaction grids, while also providing multiple maintenance and repair methods.

[0020] 5. This invention can fix ions in polluted water by injecting solid or liquid reaction solutions to provide a weak acid, weak base, or neutral environment. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0022] Figure 1 This is a three-dimensional structural schematic diagram of a permeable reactive barrier for groundwater treatment according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the wall frame of a permeable reactive wall for groundwater treatment according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the assembly of the filling component of a permeable reactive wall for groundwater treatment according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the filling component of a permeable reactive wall for groundwater treatment according to an embodiment of the present invention. Figure 5 This is a three-dimensional structural schematic diagram of a packing unit for a permeable reactive wall used for groundwater treatment according to an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the convex structure of a permeable reactive wall for groundwater treatment according to an embodiment of the present invention; Figure 7 This is a three-dimensional structural schematic diagram of a packing unit for a permeable reactive wall used for groundwater treatment according to an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of a permeable reactive barrier for groundwater treatment according to another embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures: 110. Wall frame; 1101. Permeation hole; 111. Filling cavity; 112. Operating cavity; 120. Filling assembly; 121. Filling unit; 1211. Filling skeleton; 1212. Protective net; 1213. Convex structure; 1214. Lifting hole; 1215. Separator net; 130. Operating assembly; 131. Operating box; 1311. First inlet / outlet; 1312. Second inlet / outlet; 132. First pipeline; 133. First switch; 134. Observation tube; 135. Second pipeline; 136. Second switch; 140. Flow guiding structure. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The reactive walls used in related technologies still have the following shortcomings in practical applications: 1. Aggregates and reagents are placed in underground aquifers. Aquifer composition is complex, and reagents are often depleted due to the influence of in-situ substances. Therefore, when designing reagent dosage, overdosing is usually considered. However, in many cases, the treatment effect is affected by uncertainties in the actual domestic survey work or highly specific local geological conditions.

[0028] 2. After the permeable reactive barrier for groundwater treatment is installed, daily monitoring methods are limited, primarily relying on sampling from monitoring wells on both sides of the barrier. When anomalies are detected, almost no maintenance measures are taken other than excavation and re-layout.

[0029] 3. When a permeable reactive barrier is used for groundwater treatment, it is prone to uneven distribution of the agent due to uneven formation permeability, resulting in uneven barrier zones. Additionally, the agent can only be injected in one go.

[0030] 4. After blockage occurs, a dominant seepage channel for groundwater will be formed, which will increase the local consumption of reagents and may even cause short-flows to cross the reaction wall, forming a pollution plume that spreads to the surrounding area.

[0031] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0033] like Figure 1 and Figure 2 As shown, according to an embodiment of the invention, a permeable reactive wall for groundwater treatment is provided, comprising: a wall frame 110, wherein a filling cavity 111 and an operating cavity 112 are sequentially and intermittently arranged along the length direction, the filling cavity 111 having windows on both sides of the wall frame 110 in the thickness direction; a filling component 120, disposed in the filling cavity 111 and detachably connected to the wall frame 110, the filling component 120 having multiple permeable channels in the thickness direction of the wall frame 110, the permeable channels connecting to the pipe windows; and an operating component 130, disposed in the operating cavity 112 and detachably connected to the wall frame 110, the operating component 130 being adapted to fill the filling component 120 with a reagent or to unclog the filling component 120 when it is blocked.

[0034] In this embodiment, the permeable reactive wall for groundwater treatment is installed entirely in the groundwater and mainly includes a wall frame 110, a filling component 120, and an operating component 130.

[0035] The wall frame 110 is made of high-strength, corrosion-resistant materials to ensure the stability and durability of the wall. The size and location of the wall frame 110 can be determined according to the actual conditions of the groundwater treatment site. The installation of the wall frame 110 must ensure its stability to prevent displacement of the wall due to groundwater pressure or geological changes.

[0036] Continue to combine Figure 2As shown, the wall frame 110 includes two bottom beams, two top beams, and three side plates, forming a cubic frame structure and creating chambers within it. Four partitions are installed within each chamber, with two partitions spaced apart to form operating chambers 112. Each spaced-apart operating chamber 112 forms a filling chamber 111. The filling chambers 111 and operating chambers 112 are interconnected along the length of the wall frame 110. The filling chambers 111 have windows on opposite sides along the thickness of the wall frame 110, forming permeable windows. High-strength steel mesh is installed at the side wall openings of the wall frame 110, providing overall structural strength while preventing impurities from entering the steel frame. This steel mesh has a multi-layered structure, with larger mesh sizes on the outer sides and smaller mesh sizes on the inner sides.

[0037] like Figure 3 As shown, the filling component 120 is filled with various reactive materials, such as activated carbon, iron powder, and biological fillers, allowing for the selection of appropriate reactive materials based on the type of groundwater pollution. The filling component 120 is detachably connected to the wall frame 110, facilitating replacement in case of blockage or other forms of damage. The permeable channel allows groundwater to flow smoothly through the filling component 120, ensuring full contact with the reactive materials.

[0038] The operating component 130 is located inside the operating chamber 112 and can also be detachably connected to the wall frame 110. The operating component 130 is used to fill the filling component 120 with necessary agents to enhance the water treatment effect, or to perform unblocking work when the filling component 120 is blocked, ensuring the smooth operation of the system.

[0039] The detachable connection design of the wall frame 110, the filling component 120 and the operating component 130 makes it easier to replace the filling material and unclog the wall, facilitates daily maintenance by operators, reduces maintenance costs and improves the removal efficiency of pollutants.

[0040] Both the filling component 120 and the operating component 130 have airtight measures between themselves and the wall frame 110, which can effectively prevent the formation of dominant seepage channels due to gaps and avoid the phenomenon that polluted water flows through without fully reacting with the reactive wall filler.

[0041] The permeable reactive wall can be unblocked or reactivated with chemicals, and the filling components can be lifted out and replaced as a whole, saving costs and time while maximizing the pollution remediation effect.

[0042] Furthermore, such as Figure 4As shown, the filling assembly 120 includes multiple filling units 121, which are sequentially overlapped in the height direction of the wall frame 110. Each filling unit 121 is provided with multiple liquid permeation channels.

[0043] The filling assembly 120 consists of multiple filling units 121, which are sequentially overlapped along the height of the wall frame 110 to form a continuous reaction zone. Each filling unit 121 is an independent treatment unit with a complete structure and function, capable of independently treating groundwater. By stacking multiple filling units 121, the filling assembly 120 can provide a larger treatment area and a longer treatment path, thereby improving the efficiency and effectiveness of groundwater treatment.

[0044] Multiple packing units 121 are sequentially overlapped along the height of the wall frame 110, forming a detachable connection structure. This facilitates the replacement of the reaction medium and the maintenance of the packing units 121, reducing operating costs and extending the service life of the wall. Different aggregates can be filled into the multiple packing units 121 to meet various needs. Both the filling assembly 120 and the operating assembly 130 have airtight seals between themselves and the wall frame 110, effectively preventing gaps from creating dominant seepage channels and avoiding the phenomenon of contaminated water flowing through without fully reacting with the reaction wall packing.

[0045] Furthermore, such as Figure 5 As shown, the packing unit 121 includes a packing skeleton 1211 and a protective mesh 1212. The packing skeleton 1211 and the protective mesh 1212 constitute a packing space, which is suitable for filling the reaction medium. The protective mesh 1212 constitutes multiple liquid permeation channels.

[0046] In this embodiment, the packing unit 121 mainly consists of two parts: a packing skeleton 1211 and a protective mesh 1212. These two parts together construct a packing space for containing the reaction medium. The packing skeleton 1211 is the basic structure of the packing unit 121, serving a supporting and fixing function. The packing skeleton 1211 can be configured into a cubic structure; for example, the packing skeleton 1211 includes six uprights. The packing skeleton 1211 is typically made of high-strength, corrosion-resistant materials, such as stainless steel or engineering plastics, to ensure long-term stable operation in the groundwater environment. The shape and size of the packing skeleton 1211 are designed according to the filling cavity 111 of the wall frame 110 to achieve a tight fit and effective filling with the wall frame 110. The protective mesh 1212 connects between two adjacent uprights, together forming the packing space. The permeable channels formed by the packing mesh improve the permeability of the packing unit 121, allowing groundwater to flow smoothly through the wall and avoiding a decrease in treatment efficiency due to blockage. Various reaction media, such as activated carbon, iron powder, and biological fillers, can be filled into the packing space. These reaction media can chemically react with or biodegrade pollutants in the groundwater, thereby removing the pollutants. Wastewater can enter the packing space through the permeable channels formed by the protective net 1212, ensuring the high efficiency of the packing unit 121 during the reaction process.

[0047] Furthermore, such as Figure 5 and Figure 6 As shown, two adjacent packing skeletons 1211 have a concave structure and a convex structure 1213 with a concave-convex fit, and the convex structure 1213 is provided with a lifting hole 1214; and / or at least one partition net 1215 is provided in the packing space to divide the packing space into multiple subspaces.

[0048] In this embodiment, various overlapping methods can be adopted. The selection of the overlapping method should take into account the convenience of installation, maintenance and replacement of the filling unit 121, as well as the structural stability and sealing of the wall frame 110. The plug-in method involves designing the upper or lower part of the filling unit 121 as a plug shape, and designing the corresponding position on the wall frame 110 as a socket shape. The filling unit 121 is overlapped by inserting the plug into the socket.

[0049] Specifically, the packing frame 1211 is provided with a groove or a lifting joint. The lifting joint is a column structure, which allows two adjacent packing units 121 to be inserted into each other through the groove and the column. The column is provided with a lifting hole 1214, into which a bolt is inserted to fix two adjacent packing frames 1211.

[0050] When the packing unit 121 is assembled, it can be connected by steel cable to the lifting hole 1214 located at the lifting joint for installation and movement.

[0051] Furthermore, such as Figure 7As shown, the operation component 130 includes: an operation box 131, which has a first inlet / outlet 1311; A first pipe 132 is located at the top of the control box 131, extending into the interior of the control box 131. The first pipe 132 has a first opening opposite to a first inlet / outlet 1311, allowing the first opening to communicate with the first inlet / outlet 1311. A first switch 133 is located at the top of the control box 131, adapted to open the first inlet / outlet 1311, allowing liquid to flow between the filling chamber 111 and the first pipe 132 through the first inlet / outlet 1311 and the first opening; or the first switch 133 is adapted to close the first inlet / outlet 1311. The control box 131 is a sealed box.

[0052] In this embodiment, the operating component 130 mainly includes an operating box 131, a first pipeline 132, and a first switch 133. The operating box 131 includes two first side plates and two second side plates, which are arranged opposite each other and connected to form a sealed structure. Each of the first and second side plates is provided with a first inlet / outlet 1311, and multiple first inlets / outlets 1311 are sequentially arranged along the height of the operating box 131. Similarly, multiple first openings can be provided on the first pipeline 132, with each first opening corresponding to a first inlet / outlet 1311, allowing liquid to flow out from the first opening of the first pipeline 132 and then into the first inlet / outlet 1311; or liquid can enter the first pipeline 132 from both the first inlet / outlet 1311 and the first opening. The first switch 133 can open or close the first opening, thereby opening or closing the liquid passage between the first opening and the first pipeline 132.

[0053] The first opening faces the filling cavity 111, thus allowing the filling agent to be filled into the filling cavity 111 through the first pipe 132, improving efficiency. High-pressure gas or liquid can also be introduced into the filling cavity 111 through the first pipe 132 to clear the seepage channels blocked by reaction deposition between aggregates, thereby allowing the filling cavity 111 to have dominant seepage channels, preventing contaminated water from passing through the reaction wall via these dominant seepage channels. The first pipe 132 can also be used to extract injected high-pressure water and gas, and remove contaminants. This unblocking of the filling component 120 prevents blockage and can prevent or mitigate the formation of groundwater. The main active material of the permeable reactive wall can be filled by the filling component 120 or formed by the material injected through the first pipeline 132. Staged and targeted injection through the first pipeline 132 can increase the effective reaction concentration of the reagent in the reactive zone, extend the lifespan of the reactive zone, and overcome the shortcomings of well construction injection, such as uneven reagent distribution due to uneven formation permeability leading to an uneven reactive zone, and the limitation of single-shot injection.

[0054] The active component filled in the filling component 120 can be activated or restored by the material injected through the first conduit 132, or by the injection of an agent that regulates the chemical environment, thereby extending the service life of the permeable reactive wall.

[0055] When the packing becomes clogged, the following measures can be taken as appropriate: inject high-pressure water or high-pressure air through the first pipe 132 on one side, while simultaneously extracting high-pressure water or high-pressure air through the first pipe 132 on the other side. This will clear the blocked passage. If the blockage is severe, the clogged packing assembly 120 can be lifted out, replaced with a completely new packing, and then put back in.

[0056] Furthermore, continue to combine Figure 7 As shown, the operating assembly 130 also includes an observation tube 134, which is located at the top of the operating box 131. The observation tube 134 extends into the interior of the operating box 131 and has an opening that communicates with the first pipeline 132, so that the liquid entering the first pipeline 132 enters the observation tube 134.

[0057] In this embodiment, when groundwater enters the first pipeline 132 through the first inlet / outlet 1311, since the observation pipe 134 has an opening that connects to the first pipeline 132, some liquid can flow into the observation pipe 134 through the opening. Operators can visually monitor and check the flow of liquid through the observation pipe 134. Groundwater can also be extracted through the observation pipe 134 to observe the groundwater level in the permeable reactive wall and collect samples.

[0058] During routine monitoring, the first inlet / outlet 1311 is opened by operating the first switch 133, thus establishing communication with the groundwater layer of the reactive barrier. Groundwater extraction tests, precipitation tests, or simple observations can be conducted through the observation pipe 134, enabling intuitive and efficient routine monitoring. By observing at a certain frequency, groundwater samples are collected and analyzed within the barrier to determine its energy efficiency.

[0059] In addition, depending on the specific type of reagents added to the permeable reactive barrier, reagents can be reactivated by injecting reagents that easily form deposits and coatings on the aggregates, or reagents that regulate and maintain the geophysical and chemical environment of the reactive barrier can be injected to extend the reagent life of the reactive barrier.

[0060] Furthermore, the wall frame 110 corresponding to the operating chamber 112 is provided with a permeation hole 1101, and the operating box 131 is provided with a second inlet and outlet 1312. The second inlet and outlet 1312 is arranged opposite to the permeation hole 1101, and the second inlet and outlet 1312 and the first inlet and outlet 1311 are located on different sides of the operating box 131. The operating assembly 130 also includes: a second pipe 135, located at the top of the operating box 131, extending into the interior of the operating box 131, and having a second opening on the second pipe 135, which is opposite to the second inlet and outlet 1312 so that the second opening and the second inlet and outlet 1312 are interconnected; and a second switch 136, located at the top of the operating box 131, which is adapted to open the second inlet and outlet 1312 so that liquid flows between the filling chamber 111 and the second pipe 135 through the second inlet and outlet 1312 and the second opening; or the second switch 136 is adapted to close the second inlet and outlet 1312.

[0061] In this embodiment, the permeation holes 1101 are arranged opposite each other in the thickness direction of the wall frame 110. During installation, the second inlet / outlet 1312 of the operating assembly 130 faces the permeation holes 1101, ensuring that liquid or gas can smoothly flow into or out of the second pipe 135 from the wall permeation holes 1101. To control the flow of liquid or gas, a second switch 136 is also provided on the top of the operating box 131. The function of the second switch 136 is to open or close the second inlet / outlet 1312, thereby controlling the flow of liquid or gas into and out of the second pipe 135. When the second switch 136 is in the open state, liquid or gas can flow freely through the second inlet / outlet 1312 and the second opening; while when the second switch 136 is in the closed state, it can effectively prevent the flow of liquid or gas.

[0062] Specifically, the second inlet / outlet 1312 corresponds to the permeation hole 1101 of the wall frame 110. High-pressure water or high-pressure air can be injected through the second pipe 135 for applications such as hydraulic fracturing or pumping. After the permeable reactive wall is installed, high-pressure water can be injected through the second pipe 135 and the second inlet / outlet 1312. The high-pressure water enters the soil layer through the permeation hole 1101, opening up existing fissures and creating new fissures in areas with low permeability, allowing groundwater to flow more smoothly to the permeable reactive wall. At the same time, during the impact process, pollutants adsorbed in the original soil layer dissolve in the water and flow to the permeable reactive wall, thereby increasing the pollutant removal rate and improving the pollutant removal efficiency.

[0063] The filling component 120 can be filled with fillers of low permeability, such as bentonite, to transform the permeable reactive wall into a non-permeable barrier. Then, the second inlet / outlet 1312 on the water-facing side is opened, and the water pump is connected to the second pipeline 135 to extract groundwater. After the extraction is completed, the filling component 120 is lifted out, the filler is replaced, and the function is restored to that of a permeable reactive wall.

[0064] Furthermore, two first pipes 132 and two first switches 133 are provided, with the two first pipes 132 arranged opposite each other so that the first pipes 132 can be connected or disconnected from the filling cavities 111 on the corresponding side; and / or the wall frame 110 corresponding to the operating cavity 112 is provided with permeation holes 1101 on opposite sides respectively, and two second pipes 135 and two second switches 136 are provided, with the two second pipes 135 arranged opposite each other.

[0065] In this embodiment, both the first pipe 132 and the second pipe 135 can be configured as two separate pipes, which can flexibly control the flow path of the fluid, thereby improving the operating efficiency and reliability of the system, and enhancing the overall performance and safety.

[0066] Correspondingly, there are two first inlet / outlet 1311 and two second inlet / outlet 1312, with the two first inlet / outlet 1311 facing each other and the two second inlet / outlet 1312 facing each other. Anti-clogging screens are installed inside both the first inlet / outlet 1311 and the second inlet / outlet 1312. An anti-clogging screen is also installed inside the permeation hole 1101.

[0067] Furthermore, such as Figure 8 As shown, the permeable reactive wall for groundwater treatment also includes a flow guiding structure 140, which is located at the bottom of the wall frame 110 and is adapted to guide liquid to the wall frame 110.

[0068] In this embodiment, the permeable reactive wall for groundwater treatment has a flow guiding structure 140 located at the bottom of the wall frame 110. Its main function is to effectively guide the liquid and distribute it evenly throughout the wall frame 110. Therefore, it ensures that the liquid can fully contact the reactive materials within the wall as it passes through, thereby improving treatment efficiency and purification effect.

[0069] Furthermore, the flow guiding structure 140 includes a curtain, the water-facing surface of which is provided with multiple grooves.

[0070] Understandably, the curtain is L-shaped and connected to the bottom of the wall frame 110, with the water-facing side of the curtain located below the wall frame 110. Multiple grooves on the water-facing side not only help to disperse the water flow and reduce its direct impact on the curtain, but also effectively control the water flow path, ensuring that the water flows along a predetermined trajectory to the filling component 120 located within the wall frame 110.

[0071] The curtain can also be flexibly selected from pile banks, sheet piles, etc., depending on the site conditions.

[0072] When groundwater has seepage channels under the weakly weathered layer, the water flow can be intercepted by the grooves set on the water-facing side of the curtain, allowing the water to flow upwards and enter the permeable reactive wall for treatment.

[0073] This invention can also simultaneously meet the equipment requirements of methods such as chemical precipitation reaction grids, redox reaction grids, adsorption reaction grids, and biodegradation reaction grids. It also features multiple maintenance and repair methods, solving the problem that existing permeable reaction walls require overall excavation and replacement for permeability repair and daily maintenance.

[0074] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation.

[0075] For those skilled in the art, various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this invention.

Claims

1. A permeable reactive barrier for groundwater treatment, characterized in that, include: The wall frame has interconnected filling cavities and operating cavities arranged at intervals along its length. The filling cavities have windows on both sides of the wall frame in the thickness direction. A filling component is disposed in the filling cavity and detachably connected to the wall frame. The filling component has multiple liquid permeable channels in the thickness direction of the wall frame, and the liquid permeable channels communicate with the window. An operating component is disposed in the operating cavity and detachably connected to the wall frame. The operating component is adapted to fill the filling component with a chemical agent or to unclog the filling component when it is blocked. The filling assembly includes multiple filling units, which are sequentially overlapped in the height direction of the wall frame. Each filling unit is provided with multiple liquid permeable channels. The packing unit includes a packing skeleton and a protective mesh, the packing skeleton and the protective mesh forming a packing space, the packing space being suitable for filling a reaction medium, and the protective mesh forming multiple liquid permeation channels; Two adjacent packing skeletons have concave and convex structures that fit together, and the convex structure is provided with a lifting hole; and / or the packing space is provided with at least one partition mesh to divide the packing space into multiple subspaces; The operating components include: The control box is equipped with a first inlet and outlet; A first pipeline is provided at the top of the control box and extends into the interior of the control box. The first pipeline has a first opening, which is opposite to the first inlet and outlet, so that the first opening and the first inlet and outlet are interconnected. A first switch is located on the top of the control box. The first switch is adapted to open the first inlet / outlet so that liquid flows between the filling chamber and the first pipeline through the first inlet / outlet and the first opening; or the first switch is adapted to close the first inlet / outlet. The operating chamber is provided with a permeation hole on the wall frame, and the operating box is provided with a second inlet and outlet. The second inlet and outlet are arranged opposite to the permeation hole, and the second inlet and outlet are located on different sides of the operating box from the first inlet and outlet. The operating component also includes: The second pipeline is located at the top of the control box and extends into the interior of the control box. The second pipeline has a second opening, which is opposite to the second inlet and outlet, so that the second opening and the second inlet and outlet are interconnected. A second switch is located on the top of the control box. The second switch is adapted to open the second inlet / outlet so that liquid flows between the filling chamber and the second pipeline through the second inlet / outlet and the second opening; or the second switch is adapted to close the second inlet / outlet.

2. The permeable reactive barrier for groundwater treatment according to claim 1, characterized in that, The operating component also includes an observation tube, which is located at the top of the operating box and extends into the interior of the operating box. The observation tube has an opening that communicates with the first pipeline, so that liquid entering the first pipeline can enter the observation tube.

3. The permeable reactive barrier for groundwater treatment according to claim 1, characterized in that, The first pipeline and the first switch are each configured in pairs, with the two first pipelines arranged opposite each other so that the first pipelines can communicate or disconnect with the filling cavities on the corresponding sides; and / or the wall frame corresponding to the operating cavity is provided with the permeation holes on opposite sides respectively, and the second pipeline and the second switch are each configured in pairs, with the two second pipelines arranged opposite each other.

4. The permeable reactive barrier for groundwater treatment according to claim 1, characterized in that, The permeable reactive wall for groundwater treatment also includes a flow guiding structure located at the bottom of the wall frame, which is adapted to guide liquid to the wall frame.

5. The permeable reactive barrier for groundwater treatment according to claim 4, characterized in that, The flow guiding structure includes a curtain, and the water-facing surface of the curtain has multiple grooves.

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