Long-term groundwater prb reaction wall

Abstract

The application discloses a long-acting groundwater PRB reaction wall, which comprises a filler well, a flushing pipe, a filler layer, a water injection device and a water pumping device, the filler well is arranged in a stratum, the flushing pipe is arranged in the filler well and extends vertically, a filling cavity is formed between the inner circumferential wall of the filler well and the outer circumferential wall of the flushing pipe, the filler layer is filled in the filling cavity, the water injection device is connected with the top end of the filling cavity and the top end of the flushing pipe, and the water pumping device is connected with the top end of the filling cavity and the top end of the flushing pipe, wherein the water injection device injects water into the flushing pipe, and the water pumping device pumps water from the filling cavity; the water injection device injects water into the filling cavity, and the water pumping device pumps water from the flushing pipe. The long-acting groundwater PRB reaction wall can periodically perform positive flushing and reverse flushing on the filler, avoids excessive adhesion of pollutants to the filler, prevents blockage and reduction of the contact reaction effect with the pollutants, and thus improves the in-situ groundwater remediation effect of the PRB reaction wall.

Description

Technical Field

[0001] This application relates to the field of in-situ groundwater remediation technology, and in particular to a long-lasting groundwater PRB reactive barrier. Background Technology

[0002] Permeable reactive barrier technology is an in-situ groundwater remediation technology. Its principle involves setting up a filler well in the direction of groundwater flow, filling the well with fillers such as activated carbon. Wastewater to be treated preferentially passes through the filler material, whose permeability coefficient is greater than that of the surrounding soil and rock, and reacts with the filler material to remove pollutants.

[0003] However, after long-term use, a large number of pollutants will adhere to the filler, which will not only easily cause blockage of the filler and affect the entry of groundwater, but also reduce the contact reaction effect between the filler and the pollutants, thereby reducing the in-situ remediation effect of the PRB reactive wall on groundwater. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a long-lasting groundwater PRB reactive barrier that can periodically perform forward and reverse flushing of the packing material, avoiding excessive contaminant adhesion that could cause blockage and reduce the contact reaction efficiency with contaminants, thereby improving the in-situ remediation effect of the PRB reactive barrier on groundwater.

[0005] According to an embodiment of this application, a long-lasting groundwater PRB reactive barrier includes a filling well, a flushing pipe, a filling layer, a water injection device, and a water pumping device. The filling well is located in the stratum, the flushing pipe is located within the filling well and extends vertically, a filling cavity is formed between the inner peripheral wall of the filling well and the outer peripheral wall of the flushing pipe, the filling layer fills the filling cavity, the water injection device connects the top end of the filling cavity with the top end of the flushing pipe, and the water pumping device connects the top end of the filling cavity with the top end of the flushing pipe. When the water injection device injects water into the flushing pipe, the water pumping device pumps water from the filling cavity; when the water injection device injects water into the filling cavity, the water pumping device pumps water from the flushing pipe.

[0006] The long-lasting groundwater PRB reactive barrier according to the embodiments of this application has at least the following beneficial effects: In this application, the packing well, flushing pipe, and packing layer constitute a PRB reactive wall. When underground sewage flows through the PRB reactive wall, it can react with the activated carbon and other packing materials in the packing layer, thereby removing pollutants from the underground sewage and achieving in-situ groundwater remediation. Furthermore, the water injection unit can periodically inject water into the flushing pipe, and the corresponding pumping unit can pump water from the top of the packing cavity. Thus, the injected flushing water flows out from the bottom of the flushing pipe and enters the surrounding packing layer, then flows upward to flush the packing material, and is finally extracted by the pumping unit, completing the bottom-to-top flushing of the packing material. Alternatively, the water injection unit can periodically inject water into the packing cavity, and the corresponding pumping unit can pump water from the top of the flushing pipe. Thus, the injected flushing water flows downward to reverse-flushing the packing material, then enters the flushing pipe from the bottom and is finally extracted by the pumping unit, completing the top-to-bottom flushing of the packing material. By regularly flushing the packing material in both forward and reverse directions, excessive contaminants adhering to the packing material can be avoided, which could cause blockage. This also prevents the packing material from reducing its contact reaction efficiency with contaminants, thus improving the in-situ remediation effect of the permeable reactive barrier on groundwater.

[0007] According to some embodiments of this application, the long-lasting groundwater PRB reactive barrier further includes a first connecting pipe and a second connecting pipe. The first connecting pipe is located at the top of the filling cavity and connects the water injection component and the water pumping component. The first connecting pipe has a first through hole. The second connecting pipe is located at the top of the flushing pipe and connects the water injection component and the water pumping component. The second connecting pipe has a second through hole that can be raised or lowered. The second through hole can be raised above the first through hole and lowered below the first through hole.

[0008] According to some embodiments of this application, a first sealing ring is provided on the outer peripheral wall of the bottom end of the second connecting pipe, and a liftable lifting sleeve is sleeved on the outer side of the second connecting pipe. The bottom end of the lifting sleeve forms a second through hole, and a second sealing ring is provided on the inner peripheral wall of the top end of the lifting sleeve. The outer peripheral wall of the first sealing ring is attached to the inner peripheral wall of the lifting sleeve, and the inner peripheral wall of the second sealing ring is attached to the outer peripheral wall of the second connecting pipe to form a sealing cavity. A guide pipe is provided between the sealing cavity and the second connecting pipe. When the water injection component injects water through the second connecting pipe, part of the water in the second connecting pipe flows into the sealing cavity through the guide pipe, causing the lifting sleeve to rise. When the water pumping component pumps water through the second connecting pipe, the water in the sealing cavity flows into the second connecting pipe through the guide pipe, causing the lifting sleeve to fall.

[0009] According to some embodiments of this application, the outer peripheral wall of the second connecting pipe is provided with a limiting part, the limiting part being located above the second sealing ring; and / or, the end of the connecting pipe away from the sealing cavity is connected to the second connecting pipe through a three-way regulating valve.

[0010] According to some embodiments of this application, the first connecting pipe includes an inner ring pipe and an outer ring pipe. The inner ring pipe is sleeved and fitted to the outer peripheral wall of the flushing pipe, and the outer ring pipe is sleeved on the outside of the inner ring pipe and located on the outside of the filling cavity. The outer ring pipe communicates with the inner ring pipe. Both the inner ring pipe and the outer ring pipe are provided with a plurality of first through holes arranged circumferentially, and the plurality of first through holes of the inner ring pipe and the plurality of first through holes of the outer ring pipe are circumferentially offset.

[0011] According to some embodiments of this application, the long-lasting groundwater PRB reactive wall further includes an outer well pipe, which is disposed inside the filling well and sleeved outside the flushing pipe. The bottom end of the outer well pipe is provided with a sealing plate, and the pipe wall of the outer well pipe is provided with multiple water passage holes. The filling cavity is formed between the inner peripheral wall of the outer well pipe and the outer peripheral wall of the flushing pipe.

[0012] According to some embodiments of this application, the outer well pipe has an annular cavity with a through top end on its borehole wall. A sliding spacer is inserted into the annular cavity. The spacer has multiple third through holes. During the raising and lowering of the spacer, the third through holes can communicate with the water passage hole or block the water passage hole.

[0013] According to some embodiments of this application, the bottom end of the flushing pipe is through-hole, the bottom surface of the flushing pipe is higher than the sealing plate, a support block is provided between the bottom surface of the flushing pipe and the sealing plate, and a plurality of fourth through holes are provided at the bottom end of the pipe wall of the flushing pipe.

[0014] According to some embodiments of this application, the water injection component includes a water injection pipe and a water injection pump. The water injection pipe has multiple water injection ends, which are respectively connected to the top end of the filling cavity and the top end of the flushing pipe. Each water injection end is equipped with a first shut-off valve. The water injection pump is connected to the water injection pipe; and / or, The water pumping component includes a water pumping pipe and a water pump. The water pumping pipe has multiple water pumping ends, which are respectively connected to the top of the filling cavity and the top of the flushing pipe. Each water pumping end is equipped with a second shut-off valve, and the water pump is connected to the water pumping pipe.

[0015] According to some embodiments of this application, the packing wells are provided in a plurality of locations arranged in a matrix, and the flushing pipes are provided in a plurality of locations located within the plurality of packing wells; or, the packing wells are configured as cuboid structures, and the flushing pipes are provided in a plurality of locations located within the packing wells.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and some advantages will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the long-lasting groundwater PRB reactive barrier according to an embodiment of this application; Figure 2 A schematic diagram showing the water injection component injecting water into the filling cavity and the water extraction component drawing water from the flushing pipe; Figure 3 A schematic diagram showing the water injection component injecting water into the flushing pipe and the water pumping component drawing water from the filling chamber. Figure 4 This is a schematic diagram of one method for adjusting the height of the second through hole; Figure 5 Another schematic diagram for adjusting the lifting of the second through hole; Figure 6 This is a schematic diagram showing the connection between the PRB reaction wall and the sedimentation tank 900.

[0018] Icon labels: Filled well 100; Quartz sand layer 101; Flushing pipe 200; Fourth through hole 201; Connecting plate 202; Screw 203; Nut 204; 300mm filler layer; Water injection component 400; water injection pipe 401; first shut-off valve 402; water injection pump 403; 500 pumping unit; 501 pumping pipe; 502 second shut-off valve; 503 pump; First connecting pipe 600; inner ring pipe 601; outer ring pipe 602; Second connecting pipe 700; second through hole 701; first sealing ring 702; lifting sleeve 703; second sealing ring 704; sealing cavity 705; guide pipe 706; limiting part 707; three-way regulating valve 708; External well casing 800; sealing plate 801; water passage hole 802; annular cavity 803; spacer sleeve 804; third through hole 805; Sedimentation tank 900. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] The following is for reference. Figures 1 to 6 Describes a long-lasting groundwater PRB reactive barrier according to an embodiment of this application.

[0024] According to the long-lasting groundwater PRB reactive barrier of the embodiments of this application, refer to Figures 1 to 6 As shown, it includes a packing well 100, a flushing pipe 200, a packing layer 300, a water injection component 400, and a pumping component 500.

[0025] Among them, the filling well 100 is opened in the stratum. For example, the filling well 100 can be cylindrical, and there can be multiple filling wells 100 distributed in a matrix. The filling layer 300 and flushing pipe 200 in multiple filling wells 100 together form a wall-like structure. Of course, there can also be only one filling well 100, which is set as a cuboid structure. After the filling layer 300 is filled, it directly forms a wall structure.

[0026] The flushing pipe 200 is installed inside the packing well 100 and extends vertically. Both the top and bottom ends of the flushing pipe 200 can be installed through it to facilitate the entry and exit of flushing water.

[0027] A filling cavity is formed between the inner peripheral wall of the filling well 100 and the outer peripheral wall of the flushing pipe 200. The filling layer 300 fills the filling cavity. The filling layer 300 can be activated carbon, zero-valent iron or other suitable fillers, which will not be described in detail here.

[0028] The water injection component 400 connects the top end of the filling cavity to the top end of the flushing pipe 200, and the water extraction component 500 connects the top end of the filling cavity to the top end of the flushing pipe 200. When the water injection component 400 injects water into the flushing pipe 200, the water extraction component 500 extracts water from the filling cavity.

[0029] In this application, the packing well 100, flushing pipe 200, and packing layer 300 constitute a PRB reactive wall. When underground sewage flows through the PRB reactive wall, it can react with the activated carbon and other packing materials in the packing layer 300, thereby removing pollutants from the underground sewage and achieving in-situ groundwater remediation. In addition, the water injection device 400 can periodically inject water into the flushing pipe 200, and the water extraction device 500 correspondingly extracts water from the top of the packing cavity. Thus, the injected flushing water flows out from the bottom of the flushing pipe 200 and enters the surrounding packing layer 300, then flows upward to flush the packing materials, and is finally extracted by the water extraction device 500, thereby completing the bottom-up flushing of the packing materials. In addition, the water injection unit 400 can periodically inject water into the filling cavity, while the water extraction unit 500 correspondingly extracts water from the top of the flushing pipe 200. Thus, the injected flushing water flows downwards, providing reverse flushing to the packing material. It then enters the flushing pipe 200 from the bottom and is finally extracted by the water extraction unit 500, completing the top-to-bottom flushing of the packing material. By periodically performing forward and reverse flushing of the packing material, excessive contaminants adhering to it and causing blockages are avoided, as is the reduced effectiveness of the contact reaction between the packing material and contaminants. This results in better in-situ remediation of groundwater in the permeable reactive barrier.

[0030] It should be noted that, depending on the type of pollution to be removed, corresponding cleaning agents can be added to the flushing water. For example, when the wastewater contains a large amount of heavy metals, acidic agents can be added to the flushing water. When the packing material is flushed, the acidic agents react with the heavy metal pollutants, thereby achieving the purpose of pollution removal.

[0031] refer to Figures 1 to 5 As shown, in some embodiments of this application, the long-lasting groundwater PRB reactive barrier further includes a first connecting pipe 600 and a second connecting pipe 700. The first connecting pipe 600 is located at the top of the filling cavity and connects the water injection component 400 and the water pumping component 500. The first connecting pipe 600 has a first through hole. The second connecting pipe 700 is located at the top of the flushing pipe 200 and connects the water injection component 400 and the water pumping component 500. The second connecting pipe 700 has a second through hole 701 that can be raised or lowered. The second through hole 701 can be raised above the first through hole and lowered below the first through hole.

[0032] In this application, both the water injection component 400 and the water extraction component 500 are connected to the first connecting pipe 600 at the top of the filling cavity. Through the first connecting pipe 600 and its first through hole, the water injection component 400 and the water extraction component 500 can conveniently inject and extract water into the filling cavity. Both the water injection component 400 and the water extraction component 500 are connected to the second connecting pipe 700 at the top of the flushing pipe 200. Through the second connecting pipe 700 and its second through hole 701, the water injection component 400 and the water extraction component 500 can conveniently inject and extract water into the flushing pipe 200.

[0033] Furthermore, the second through hole 701 of the second connecting pipe 700 can be raised and lowered. The second through hole 701 can rise above the first through hole and fall below the first through hole. Thus, when the water injection component 400 injects water into the flushing pipe 200 and the water extraction component 500 extracts water from the filling cavity, the second through hole 701 is raised above the first through hole. That is, the height at which the water injection component 400 injects water into the flushing pipe 200 is higher than the height at which the water extraction component 500 extracts water from the filling cavity. This facilitates the flow of flushing water to the extraction position at the top of the filling cavity after it is injected from the top of the flushing pipe 200, making extraction easier. When the water injection component 400 injects water into the filling cavity and the water extraction component 500 extracts water from the flushing pipe 200, the second through hole 701 is lowered to below the first through hole. That is, the height at which the water injection component 400 injects water into the filling cavity is higher than the height at which the water extraction component 500 extracts water from the flushing pipe 200. After the flushing water is injected from the top of the filling cavity, it is convenient for the flushing water to flow from the bottom of the flushing pipe 200 to the extraction position at the top of the flushing pipe 200, so as to facilitate extraction and avoid dry extraction that could damage the water extraction component 500.

[0034] refer to Figure 4As shown, in some embodiments of this application, the bottom end of the second connecting pipe 700 can extend into the flushing pipe 200 and extend vertically. The outer peripheral wall of the bottom end of the second connecting pipe 700 is provided with a first sealing ring 702, which surrounds the second connecting pipe 700. A liftable lifting sleeve 703 is sleeved on the outside of the second connecting pipe 700. The bottom end of the lifting sleeve 703 is provided to form a second through hole 701. The inner peripheral wall of the top end of the lifting sleeve 703 is provided with a second sealing ring 704, which surrounds the second connecting pipe 700. The outer peripheral wall of the first sealing ring 702 is attached to the inner peripheral wall of the lifting sleeve 703 and can slide relative to it vertically. The inner peripheral wall of the second sealing ring 704 is attached to the outer peripheral wall of the second connecting pipe 700 and can slide relative to it vertically. The first sealing ring 702, the second sealing ring 704, the outer peripheral wall of the second connecting pipe 700, and the inner peripheral wall of the lifting sleeve 703 form a sealing cavity 705. A guide pipe 706 is provided between the sealing cavity 705 and the second connecting pipe 700. For example, one end of the guide pipe 706 can be connected to the lifting sleeve 703 and communicate with the sealing cavity 705, and the other end can be connected to the end of the second connecting pipe 700 near the water injection component 400 and the water pumping component 500. When the water injection component 400 injects water through the second connecting pipe 700, some of the water in the second connecting pipe 700 flows into the sealing cavity 705 through the guide pipe 706, causing the lifting sleeve 703 to rise; when the water extraction component 500 extracts water through the second connecting pipe 700, the water in the sealing cavity 705 flows into the second connecting pipe 705 through the guide pipe 706, causing the lifting sleeve 703 to fall.

[0035] In this embodiment, when the water injection component 400 injects water through the second connecting pipe 700, the flushing water in the second connecting pipe 700 forms a positive pressure, which forces some of the flushing water into the guide pipe 706 and flows into the sealing cavity 705 through the guide pipe 706. The hydraulic pressure of the flushing water pushes the second sealing ring 704 upward, thereby causing the lifting sleeve 703 to rise, and thus causing the second through hole 701 at the bottom of the lifting sleeve 703 to rise above the first through hole. When the water pumping component 500 pumps water through the second connecting pipe 700, the flushing water in the second connecting pipe 700 forms a negative pressure, which draws water from the sealing cavity 705 through the guide pipe 706. This causes the second sealing ring 704 to move downward, thereby causing the lifting sleeve 703 to descend, and thus causing the second through hole 701 at the bottom of the lifting sleeve 703 to descend below the first through hole.

[0036] Thus, when the water injection component 400 injects water through the second connecting pipe 700 and the water pumping component 500 pumps water through the second connecting pipe 700, the second through hole 701 can rise or fall accordingly. The structure is simple and does not require manual operation, making it very convenient to operate. In addition, no additional drive structure is needed, resulting in lower costs.

[0037] refer to Figure 5As shown, in some embodiments of this application, the bottom end of the second connecting pipe 700 may form a second through hole 701, and the top end of the flushing pipe 200 may be provided with a connecting plate 202. The connecting plate 202 has a through mounting hole, through which a screw 203 passes. The bottom end of the screw 203 is connected to the bottom end of the second connecting pipe 700, and the screw 203 is threadedly connected with two nuts 204. The two nuts 204 abut against the top and bottom ends of the connecting plate 202, respectively. By rotating and adjusting the two nuts 204, the screw 203 can be raised and lowered, thereby driving the second through hole 701 at the bottom end of the second connecting pipe 700 to rise and fall.

[0038] refer to Figure 4 As shown, in some embodiments of this application, the outer peripheral wall of the second connecting pipe 700 is provided with a limiting part 707, which is located above the second sealing ring 704.

[0039] In this embodiment, a limiting part 707 is provided to prevent the lifting sleeve 703 from rising too high and causing the sealing cavity 705 to be eliminated.

[0040] refer to Figure 4 As shown, in some embodiments of this application, the end of the guide tube 706 away from the sealing cavity 705 is connected to the second connecting tube 700 through a three-way regulating valve 708.

[0041] In this embodiment, the end of the guide pipe 706 away from the sealing cavity 705 is connected to the second connecting pipe 700 through a three-way regulating valve 708. The three-way regulating valve 708 can regulate and distribute the flow rate and hydraulic pressure, thus making it easier for the guide pipe 706 to inject flushing water into the sealing cavity 705 or extract flushing water from the sealing cavity 705.

[0042] refer to Figures 1 to 3 As shown, in some embodiments of this application, the first connecting pipe 600 includes an inner ring pipe 601 and an outer ring pipe 602. The inner ring pipe 601 is sleeved and fitted to the outer peripheral wall of the flushing pipe 200, and the outer ring pipe 602 is sleeved on the outside of the inner ring pipe 601 and located on the outside of the filling cavity. The outer ring pipe 602 communicates with the inner ring pipe 601. Both the inner ring pipe 601 and the outer ring pipe 602 are provided with a plurality of first through holes arranged circumferentially, and the plurality of first through holes of the inner ring pipe 601 and the plurality of first through holes of the outer ring pipe 602 are staggered circumferentially.

[0043] In this embodiment, the first connecting pipe 600 includes an inner ring pipe 601 and an outer ring pipe 602 that are nested together. The multiple first through holes of the inner ring pipe 601 and the multiple first through holes of the outer ring pipe 602 are staggered in the circumferential direction. In this way, when the water injection component 400 injects water, the first connecting pipe 600 can inject water more comprehensively and evenly into the larger area of ​​the packing layer 300, thereby making the flushing effect of the packing better.

[0044] refer toFigures 1 to 3 As shown, in some embodiments of this application, the long-lasting groundwater PRB reactive wall also includes an outer well pipe 800, which is disposed inside the filling well 100 and sleeved outside the flushing pipe 200. The bottom end of the outer well pipe 800 is provided with a sealing plate 801, and the pipe wall of the outer well pipe 800 is provided with multiple water passage holes 802. A filling cavity is formed between the inner peripheral wall of the outer well pipe 800 and the outer peripheral wall of the flushing pipe 200.

[0045] In this embodiment, an outer well pipe 800 is installed inside the filling well 100, and the outer well pipe 800 is sleeved outside the flushing pipe 200. The filling layer 300 fills the space between the inner peripheral wall of the outer well pipe 800 and the outer peripheral wall of the flushing pipe 200. This prevents the filling material from moving freely within the formation and reducing the decontamination effect. Furthermore, the outer well pipe 800 has a sealing plate 801 at its bottom end, which prevents the flushing water injected by the water injection unit 400 from flowing freely into the formation from all sides, thus improving the flushing effect on the filling material. In addition, the outer well pipe 800 has multiple water passage holes 802 on its wall, facilitating the passage of groundwater through the wall of the outer well pipe 800 into the filling layer 300 to react with the filling material, or facilitating the flow of decontaminated groundwater from the filling layer 300 out of the wall of the outer well pipe 800, thereby improving the decontamination effect.

[0046] refer to Figures 1 to 3 As shown, in some embodiments of this application, the outer well pipe 800 has an annular cavity 803 with a through top end on the borehole wall. A sliding spacer 804 is inserted in the annular cavity 803. The spacer 804 has multiple third through holes 805. During the raising and lowering of the spacer 804, the third through holes 805 can communicate with the water passage hole 802 or block the water passage hole 802.

[0047] Because of the presence of the water passage hole 802, when the water injection component 400 injects flushing water, some of the flushing water will flow out from the water passage hole 802, resulting in waste of flushing water and reducing the flushing effect. When the water extraction component 500 extracts flushing water, it will also extract groundwater from the outside, which will also affect the flushing effect. In this embodiment, during the injection and extraction of flushing water, the partition sleeve 804 is slid up and down to block the water passage hole 802, preventing flushing water from flowing out of the water passage hole 802 at will or external groundwater from entering through the water passage hole 802, thus improving the flushing effect. After flushing is completed, the partition sleeve 804 can be slid up and down to connect the third through hole 805 on the partition sleeve 804 with the water passage hole 802, thereby facilitating the entry of external underground sewage into the packing layer 300 for decontamination treatment.

[0048] It should be noted that after the spacer 804 slides up and down to the desired position, it can be restricted from further sliding by a limit pin. Alternatively, the lifting and lowering can also be directly controlled by a hydraulic cylinder, which will not be elaborated here.

[0049] refer toFigures 1 to 3 As shown, in some embodiments of this application, the bottom end of the flushing pipe 200 is provided through, the bottom surface of the flushing pipe 200 is higher than the sealing plate 801, a support block is provided between the bottom surface of the flushing pipe 200 and the sealing plate 801, and a plurality of fourth through holes 201 are provided at the bottom end of the pipe wall of the flushing pipe 200.

[0050] In this embodiment, the bottom surface of the flushing pipe 200 is higher than the sealing plate 801. This facilitates the entry of flushing water from the bottom end of the flushing pipe 200 into the packing layer 300 or into the flushing pipe 200 itself, preventing blockage. A support block is provided between the bottom surface of the flushing pipe 200 and the sealing plate 801 to prevent the flushing pipe 200 from arbitrarily descending to fit against the sealing plate 801 and blocking the bottom end of the flushing pipe 200. In addition, the bottom end of the flushing pipe 200 has multiple fourth through holes 201. Even if the bottom end of the flushing pipe 200 is blocked, flushing water can still pass through the fourth through holes 201, thereby improving the flushing effect.

[0051] refer to Figures 1 to 3 As shown, in some embodiments of this application, a layer of quartz sand 101 is filled between the outer peripheral wall of the outer well pipe 800 and the inner peripheral wall of the filling well. This reduces the chance of underground soil randomly passing through the water passage 802 and entering the outer well pipe 800.

[0052] refer to Figures 1 to 3 and Figure 6 As shown, in some embodiments of this application, the water injection component 400 includes a water injection pipe 401 and a water injection pump 403. The water injection pipe 401 has multiple water injection ends, which are respectively connected to the top of the filling cavity and the top of the flushing pipe 200. Each water injection end is equipped with a first shut-off valve 402. The water injection pump 403 is connected to the water injection pipe 401. For example, the number of water injection ends can be the same as the number of filling cavities and flushing pipes 200, with some water injection ends connected to the top of the filling cavity and some water injection ends connected to the top of the flushing pipe 200.

[0053] In this embodiment, the water injection pump 403 injects flushing water through the water injection pipe 401. By opening or closing the first shut-off valve 402 on different water injection ends, the water injection pump 403 can inject flushing water into the flushing pipe 200 or the filling cavity, which is convenient to use.

[0054] refer to Figures 1 to 3 and Figure 6 As shown, in some embodiments of this application, the pumping component 500 includes a pumping pipe 501 and a pumping pump 503. The pumping pipe 501 has multiple pumping ends, which are respectively connected to the top of the filling chamber and the top of the flushing pipe 200. Each pumping end is equipped with a second shut-off valve 502. The pumping pump 503 is connected to the pumping pipe 501. For example, the number of pumping ends can be the same as the number of filling chambers and flushing pipes 200, with some pumping ends connected to the top of the filling chamber and some pumping ends connected to the top of the flushing pipe 200.

[0055] In this embodiment, the water pump 503 draws flushing water through the water pumping pipe 501. By opening or closing the second shut-off valve 502 on different water pumping ends, the water pump 503 can draw water from the flushing pipe 200 or the filling cavity, which is convenient to use.

[0056] refer to Figure 6 As shown in some embodiments of this application, a sedimentation tank 900 can be set up near the long-term groundwater PRB reaction wall. Both the water injection pipe 401 and the water extraction pipe 501 can be connected to the sedimentation tank 900. The water extraction pipe 501 pumps out the flushing water after rinsing the packing material and injects it into the sedimentation tank 900 for sedimentation and sludge removal. The water injection pipe 401 can use the water injection pump 403 to extract the flushing water after sludge removal in the sedimentation tank 900 for recycling, thereby reducing the waste of flushing water.

[0057] In some embodiments of this application, multiple packing wells 100 are provided and arranged in a matrix, and multiple flushing pipes 200 are provided and located in multiple packing wells 100 respectively.

[0058] Of course, in some other embodiments of this application, only one packing well 100 may be provided and configured as a cuboid structure. Multiple flushing pipes 200 are provided and all are located inside the packing well 100. After the packing layer 300 is filled, a wall structure is formed.

[0059] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A long-lasting groundwater PRB reactive barrier, characterized in that, include: Filler wells are constructed within the formation. A flushing pipe is disposed in the packing well and extends vertically, and a filling cavity is formed between the inner peripheral wall of the packing well and the outer peripheral wall of the flushing pipe; A filler layer is used to fill the filling cavity; Water injection component, connecting the top end of the filling cavity to the top end of the flushing pipe; A pumping unit that connects the top end of the filling cavity to the top end of the flushing pipe; When the water injection component injects water into the flushing pipe, the water pumping component draws water from the filling cavity; when the water injection component injects water into the filling cavity, the water pumping component draws water from the flushing pipe.

2. The long-lasting groundwater PRB reactive barrier according to claim 1, characterized in that, Also includes: A first connecting pipe is provided at the top of the filling cavity and connects the water injection component and the water pumping component. The first connecting pipe is provided with a first through hole. The second connecting pipe is located at the top of the flushing pipe and connects the water injection component and the water pumping component. The second connecting pipe has a second through hole that can be raised or lowered. The second through hole can be raised to a position higher than the first through hole and lowered to a position lower than the first through hole.

3. The long-lasting groundwater PRB reactive barrier according to claim 2, characterized in that, The outer peripheral wall at the bottom end of the second connecting pipe is provided with a first sealing ring, and a liftable lifting sleeve is sleeved on the outer side of the second connecting pipe. The bottom end of the lifting sleeve forms a second through hole, and the inner peripheral wall at the top end of the lifting sleeve is provided with a second sealing ring. The outer peripheral wall of the first sealing ring is attached to the inner peripheral wall of the lifting sleeve, and the inner peripheral wall of the second sealing ring is attached to the outer peripheral wall of the second connecting pipe to form a sealing cavity. A connecting pipe is provided between the sealing cavity and the second connecting pipe. When the water injection component injects water through the second connecting pipe, some of the water in the second connecting pipe flows into the sealing cavity through the guide pipe, causing the lifting sleeve to rise; when the water pumping component pumps water through the second connecting pipe, the water in the sealing cavity flows into the second connecting pipe through the guide pipe, causing the lifting sleeve to fall.

4. The long-lasting groundwater PRB reactive barrier according to claim 3, characterized in that, The outer peripheral wall of the second connecting pipe is provided with a limiting part, which is located above the second sealing ring; and / or, The end of the conductive tube furthest from the sealed cavity is connected to the second connecting tube via a three-way regulating valve.

5. The long-lasting groundwater PRB reactive barrier according to claim 2, characterized in that, The first connecting pipe includes: The inner ring tube is fitted and attached to the outer peripheral wall of the flushing tube; An outer ring tube is sleeved on the outside of the inner ring tube and located outside the filling cavity. The outer ring tube is connected to the inner ring tube. Both the inner ring tube and the outer ring tube are provided with a plurality of first through holes arranged circumferentially. The plurality of first through holes of the inner ring tube and the plurality of first through holes of the outer ring tube are staggered circumferentially.

6. The long-lasting groundwater PRB reactive barrier according to claim 1, characterized in that, Also includes: An outer well pipe is installed inside the filling well and sleeved outside the flushing pipe. The bottom end of the outer well pipe is provided with a sealing plate. The pipe wall of the outer well pipe is provided with multiple water passage holes. The filling cavity is formed between the inner peripheral wall of the outer well pipe and the outer peripheral wall of the flushing pipe.

7. The long-lasting groundwater PRB reactive barrier according to claim 6, characterized in that, The outer well casing has an annular cavity with a through top on the borehole wall. A sliding spacer is inserted into the annular cavity. The spacer has multiple third through holes. During the raising and lowering of the spacer, the third through holes can communicate with the water passage or block the water passage.

8. The long-lasting groundwater PRB reactive barrier according to claim 6, characterized in that, The bottom end of the flushing pipe is through-hole, the bottom surface of the flushing pipe is higher than the sealing plate, a support block is provided between the bottom surface of the flushing pipe and the sealing plate, and multiple fourth through holes are provided at the bottom end of the pipe wall of the flushing pipe.

9. The long-lasting groundwater PRB reactive barrier according to claim 1, characterized in that, The water injection component includes: The water injection pipe is provided with multiple water injection ends, and the multiple water injection ends are respectively connected to the top end of the filling cavity and the top end of the flushing pipe. Each water injection end is provided with a first shut-off valve. A water pump is connected to the water injection pipe; and / or, The pumping component includes: The water pump pipe has multiple water pumping ends, and the multiple water pumping ends are respectively connected to the top of the filling cavity and the top of the flushing pipe. Each water pumping end is equipped with a second shut-off valve. A water pump is connected to the water pumping pipe.

10. The long-lasting groundwater PRB reactive barrier according to claim 1, characterized in that, The packing wells are provided in multiple locations arranged in a matrix, and the flushing pipes are provided in multiple locations, each located within one of the packing wells; or... The packing well is configured as a cuboid structure, and multiple flushing pipes are provided, all of which are located inside the packing well.

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