An in-situ groundwater treatment device for horizontal and vertical wells

Abstract

The utility model discloses a horizontal well vertical well combined groundwater in situ treatment device, horizontal well one end is provided with screen pipe section, and screen pipe section and the bottom of vertical well intercommunication, and the bottom of vertical well is provided with the bulkhead, and the bulkhead is installed with the extraction pump, and the water outlet pipe top end of extraction pump passes through the bulkhead and is located the top of bulkhead, and the upper surface of bulkhead is provided with a plurality of aerators through pipeline, and vertical well is provided with the support grating through the boss, and the modular treatment bin is movably arranged in the vertical well and is supported on the support grating at the bottom, and the modular treatment bin is filled with activated carbon adsorption layer, bamboo charcoal fiber layer and biological membrane reaction layer from bottom to top in turn, and a plurality of screen holes are radially arranged in the upper part of vertical well, the utility model discloses reasonable structure, and the contaminated groundwater is extracted accurately through horizontal well, and after multilayer treatment in vertical well, the in situ backflow is solved, and the problem that the treatment efficiency of pollution plume core area is low and the pollutants are not removed completely in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of groundwater pollution remediation technology, specifically a groundwater in-situ treatment device that combines horizontal and vertical wells. Background Technology

[0002] With the intensification of industrial development and human activities, groundwater pollution has become increasingly prominent, posing a serious threat to the ecological environment and human health. Therefore, the research and application of groundwater pollution remediation technologies are of significant practical importance. Currently, groundwater pollution remediation technologies mainly include two categories: ex-situ treatment and in-situ treatment. Among them, in-situ treatment technology has received widespread attention because it does not require the large-scale discharge of polluted groundwater, reducing transportation costs and the risk of secondary pollution. In existing in-situ remediation technologies, the application of single-well types is more common. Although horizontal wells can cover a large area of ​​polluted area, they often cannot accurately target the core area of ​​the pollution plume for efficient treatment. The uneven concentration of pollutants extracted from the groundwater leads to limited subsequent treatment efficiency. Vertical wells, although capable of deep treatment in local areas, have limited coverage and cannot comprehensively treat diffusely distributed pollution plumes, especially lacking targeted treatment of the core area of ​​the pollution plume.

[0003] For example, Chinese patent CN115849617B discloses a groundwater remediation system and method for low-permeability formations based on a groundwater circulation well, including a groundwater circulation well, a pumping unit, a surface treatment unit, and a reinjection unit. The pumping unit includes a pumping pipe and a pump, located at the bottom of the pumping well; the packing section of the water circulation well is divided into upper and lower layers, with the upper layer above the groundwater level and the lower layer located at the bottom of the pumping well. The technical solution of this patent separates the pumping and reinjection operations in the circulation well and expands the radius of influence of groundwater through a gas injection unit. However, it is not effective for targeted treatment of contaminated areas with large pollution ranges and diffuse pollution plumes. Furthermore, existing in-situ treatment devices often have relatively simple treatment units or poor coordination between units, making it difficult to achieve efficient, step-by-step removal of different types of pollutants, often resulting in incomplete pollutant removal. At the same time, most devices lack flexible reaction condition control mechanisms, failing to adjust treatment parameters according to changes in pollutant type and concentration, further limiting remediation efficiency.

[0004] For example, Chinese Patent CN 219341926 U discloses an in-situ bio-enhancing coupled groundwater circulation well remediation system, including a groundwater circulation well system and in-situ bio-enhancing systems respectively located upstream and downstream of the circulation well. The in-situ bio-enhancing system comprises an aeration well near the groundwater circulation well system and an injection well away from the groundwater circulation well system; the circulation well system includes an outer well pipe, an inner well pipe, and a baffle plate dividing the well pipe into upper and lower well pipes; the upper and lower well pipes are respectively provided with upper and lower perforations; the inner well pipe is provided with a circulation well aeration head; the outer well pipe is provided with a well cover; the circulation well aeration head is connected to an aeration device through an aeration pipe; the upper perforation is located below the groundwater surface; the portion of the outer well pipe above ground level is provided with a tail gas outlet; the aeration well includes a body, aeration well perforations, and an aeration head, the aeration head being connected to an ozone generator through an aeration pipe; the injection well includes a body, injection well perforations, and an injection pipe, the injection pipe being connected to a medicine tank. The technical solutions of the aforementioned patents focus on enhancing the in-situ bioremediation of groundwater and improving remediation efficiency, but they are difficult to achieve efficient, stepwise removal of different types of pollutants.

[0005] Therefore, there is an urgent need for an in-situ groundwater treatment device that can precisely target the core area of ​​the pollution plume, achieve multi-unit collaborative treatment, flexibly adjust reaction conditions, and avoid secondary pollution, in order to overcome the shortcomings of existing technologies. Utility Model Content

[0006] The purpose of this invention is to provide a groundwater in-situ treatment device that combines horizontal and vertical wells to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a groundwater in-situ treatment device combining horizontal and vertical wells, comprising a horizontal well, a vertical well, a pump, and a modular treatment chamber. One end of the horizontal well is provided with a screen section, which is connected to the bottom of the vertical well. A baffle plate is provided at the bottom of the vertical well, and a pump is installed on the baffle plate. The inlet of the pump extends to the screen section via a pumping pipe, and the outlet of the pump is connected to an outlet pipe. The top of the outlet pipe passes through the baffle plate and is located above it. Several aerators are installed on the upper surface of the baffle plate via pipes. A supporting grid is provided inside the vertical well via a boss. The modular treatment chamber is movably disposed inside the vertical well and supported at its bottom on the supporting grid. The modular treatment chamber is filled from bottom to top with an activated carbon adsorption layer, a bamboo charcoal fiber layer, and a biofilm reaction layer. Several sieve holes are radially opened at the upper part of the vertical well.

[0008] Preferably, the present invention provides a groundwater in-situ treatment device for the combined use of horizontal and vertical wells, wherein a wiring hole is provided on the side wall of the vertical well below the boss, and the extension section of the pipeline and the connecting line of the extraction pump pass through the wiring hole and are sealed at the wiring hole.

[0009] Preferably, the present invention provides a groundwater in-situ treatment device for the combined use of horizontal and vertical wells, wherein the top of the modular treatment chamber is provided with a chamber cover, the upper surface of the chamber cover is provided with a lifting ring, and the bottom of the chamber cover and the modular treatment chamber are densely covered with through holes.

[0010] Preferably, the present invention provides a groundwater in-situ treatment device that combines horizontal and vertical wells, wherein the outer surface of the modular treatment chamber is movably connected to the inner wall of the vertical well.

[0011] Preferably, the present invention provides a groundwater in-situ treatment device that combines horizontal and vertical wells, wherein the vertical well is surrounded by filler material.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) The horizontal well screen pipe section is precisely aligned with the core area of ​​the pollution plume, and the extraction pump is used to directionally extract high-concentration sewage, thereby improving the treatment targeting.

[0014] (2) A modular treatment chamber is set up inside the vertical well. The activated carbon adsorption layer, bamboo charcoal fiber layer and biofilm reaction layer in the modular treatment chamber work together to remove hydrophobic organic matter, residual pollutants and biodegradable substances in sequence, making the treatment more thorough. In addition, the modular structure makes it easy to lift the whole unit out of the vertical well, which facilitates the maintenance of equipment such as aerators and extraction pumps.

[0015] (3) Several aerators are installed on the upper surface of the sealing plate. The biological reaction conditions can be flexibly adjusted through the aerators to meet the degradation requirements of different pollutants.

[0016] (4) The whole process is in-situ treatment, which does not require the arrangement of groundwater surface treatment units, reducing the cost of groundwater discharge and transportation. After the repair, the groundwater is returned through the screen holes to realize the vertical dynamic circulation of groundwater, so that the groundwater circulation is repaired through the treatment chamber, solving the problem of incomplete groundwater repair. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of a vertical shaft;

[0019] Figure 3 This is a schematic diagram of the external structure of a vertical shaft.

[0020] In the diagram: 1. Horizontal well; 2. Vertical well; 3. Extraction pump; 4. Modular treatment chamber; 5. Screen pipe section; 6. Seal plate; 7. Pumping pipe; 8. Outlet pipe; 9. Pipe; 10. Aerator; 11. Boss; 12. Support grid; 13. Activated carbon adsorption layer; 14. Bamboo charcoal fiber layer; 15. Biofilm reaction layer; 16. Screen hole; 17. Wiring hole; 18. Chamber cover; 19. Lifting ring; 20. Packing material. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0023] Please see Figure 1-3This utility model provides a technical solution: an in-situ groundwater treatment device combining horizontal and vertical wells, comprising a horizontal well 1, a vertical well 2, a pump 3, and a modular treatment chamber 4. A screen section 5 is provided at one end of the horizontal well 1, and the screen section 5 is interconnected with the bottom of the vertical well 2. The horizontal well 1 and the vertical well 2 are made of UPVC. A baffle plate 6 is provided at the bottom of the vertical well 2, and the pump 3 is installed on the baffle plate 6. The inlet end of the pump 3 extends to the screen section 5 through a pumping pipe 7, and the outlet end of the pump 3 is connected to an outlet pipe 8. The top of the outlet pipe 8 passes through the baffle plate 6 and is located above the baffle plate 6. Several aerators 10 are provided on the upper surface of the baffle plate 6 through pipes 9. A supporting grid 12 is provided inside the vertical well 2 through a boss 11. The modular treatment chamber 4 is movably disposed inside the vertical well 2 and supported at the bottom by the supporting grid 12. The outer surface of the modular treatment chamber 4 is movably connected to the inner wall of the vertical well 2 to ensure that polluted water cannot escape from the modular treatment chamber 4. The gap between the vertical well 2 and the inner wall is moved upward to ensure that the polluted water passes through the activated carbon adsorption layer 13, bamboo charcoal fiber layer 14 and biofilm reaction layer 15 in the modular treatment chamber 4. The top of the modular treatment chamber 4 is equipped with a chamber cover 18, and the upper surface of the chamber cover 18 is equipped with a lifting ring 19. The bottom of the chamber cover 18 and the modular treatment chamber 4 are densely covered with through holes. The chamber cover 18 is used to facilitate the replacement of the activated carbon adsorption layer 13, bamboo charcoal fiber layer 14 and biofilm reaction layer 15. The lifting ring 19 is used to facilitate the cooperation with the hoisting equipment, so as to lift the modular treatment chamber 4 out of the vertical well 2. The modular treatment chamber 4 is filled with the activated carbon adsorption layer 13, bamboo charcoal fiber layer 14 and biofilm reaction layer 15 from bottom to top. The upper part of the vertical well 2 has several sieve holes 16 radially opened. The vertical well 2 is wrapped with packing material 20. The packing material 20 is made of 2-4mm quartz sand to achieve further water filtration. The treated water flows back to the groundwater layer after passing through the packing material 20.

[0024] A wiring hole 17 is provided on the side wall of the vertical shaft 2 and below the boss 11. The extension section of the pipe 9 and the connection line of the extraction pump 3 pass through the wiring hole 17 and are sealed at the wiring hole 17. The wiring hole 17 is provided so that the extension section of the pipe 9 and the connection line of the extraction pump 3 can be laid along the periphery of the vertical shaft 2 without affecting the installation of the modular processing chamber 4. The extension section of the pipe 9 and the connection line of the extraction pump 3 pass through the wiring hole 17 and can be laid upward along the packing 20.

[0025] Installation method and operating principle: First, connect the extraction pump 3 to the baffle plate 6, and pass the outlet pipe 8 of the extraction pump 3 through the baffle plate 6. Seal the connections between the baffle plate 6, the extraction pump 3, and the outlet pipe 8. Install the baffle plate 6 at the bottom of the vertical well 2. Then, install the pipe 9 with the aerator 10 on the baffle plate 6. Next, pass the extension section of the pipe 9 and the connecting wire of the extraction pump 3 through the wiring hole 17 and seal it. Finally, place the support grid 12 inside the vertical well 2 and support it on the boss 11. The activated carbon adsorption layer 13, bamboo charcoal fiber layer 14, and biofilm reaction layer 15 are sequentially filled into the modular treatment chamber 4. The thickness and particle size of the activated carbon adsorption layer 13 can be adjusted according to the groundwater pollution situation, efficiently adsorbing most hydrophobic organic pollutants and some heavy metals. The bamboo charcoal fiber layer 14 is composed of interwoven bamboo charcoal fiber filaments, which can further adsorb the remaining pollutants and provide an attachment substrate for microorganisms, realizing the transition from adsorption to biological treatment. The biofilm reaction layer 15 is filled with porous ceramic filler to increase the attachment area for microorganisms. After the chamber cover 18 is closed, the modular treatment chamber 4 is hoisted into the vertical well 2 using a winch or electric hoist, and the bottom of the modular treatment chamber 4 is supported on the support grid 12. At this time, the upper part of the vertical well is connected to the groundwater layer through the screen holes and is located above the groundwater level, completing the installation. In use, the extraction pump 3 is started to continuously extract groundwater from the core area of ​​the pollution plume through the screen section 5. The extraction rate is adjusted by the flow control valve. The polluted groundwater is transported through the outlet pipe 8 to the top of the baffle plate 6 and located at the bottom of the modular treatment chamber 4. It flows upward through the activated carbon adsorption layer 13, where most of the hydrophobic organic pollutants and heavy metals are adsorbed and removed. The water continues to flow upward into the bamboo charcoal fiber layer 14, where the remaining pollutants are further adsorbed. At the same time, the bamboo charcoal fiber provides attachment sites for microorganisms. The water flows into the biofilm reaction layer 15, and the aeration system is turned on. The functional microorganisms attached to the biofilm reaction layer 15 and the bamboo charcoal fiber oxidize and decompose dissolved organic matter, ammonia nitrogen, etc. If treating polluted water containing nitrates, the aeration system can be turned off to create an anaerobic environment. Nitrates are reduced and converted by denitrifying bacteria. Finally, the purified water is filtered through the screen holes 16 above the modular treatment chamber 4 and then returned to the groundwater layer to complete the in-situ remediation.This utility model has a reasonable structure. The screen pipe section 5 of the horizontal well 1 is precisely aligned with the core area of ​​the pollution plume. The extraction pump 3 directionally pumps high-concentration sewage, improving the treatment targeting. The activated carbon adsorption layer 13, bamboo charcoal fiber layer 14, and biofilm reaction layer 15 in the modular treatment chamber 4 work together to remove hydrophobic organic matter, residual pollutants, and biodegradable substances in sequence, resulting in more thorough treatment. The modular structure also makes it easy to pull out the whole unit from the vertical well 2, which facilitates the maintenance and repair of equipment such as aerators 10 and extraction pumps 3. Several aerators 10 are set on the upper surface of the baffle plate 6, which can flexibly adjust the biological reaction conditions to adapt to the degradation requirements of different pollutants. The whole system is an in-situ treatment, which does not require the layout of a groundwater surface treatment unit, reducing the cost of groundwater discharge and transportation. After the treatment, the groundwater is returned through the screen holes 16 to achieve vertical dynamic circulation of groundwater, so that the groundwater is circulated through the treatment chamber for treatment, solving the problem of incomplete groundwater treatment.

[0026] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0027] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A groundwater in-situ treatment device combining horizontal and vertical wells, characterized in that: The system includes a horizontal well (1), a vertical well (2), a pump (3), and a modular processing chamber (4). One end of the horizontal well (1) is equipped with a screen pipe section (5), which is connected to the bottom of the vertical well (2). A baffle plate (6) is installed at the bottom of the vertical well (2), and the pump (3) is mounted on the baffle plate (6). The inlet of the pump (3) extends to the screen pipe section (5) via a pumping pipe (7). The outlet of the pump (3) is connected to an outlet pipe (8), the top of which passes through the baffle plate (6) and is located at... Above the sealing plate (6), several aerators (10) are provided on the upper surface of the sealing plate (6) through pipes (9). A support grid (12) is provided in the vertical well (2) through a boss (11). The modular treatment chamber (4) is movably installed in the vertical well (2) and supported on the support grid (12) at the bottom. The modular treatment chamber (4) is filled from bottom to top with an activated carbon adsorption layer (13), a bamboo charcoal fiber layer (14) and a biofilm reaction layer (15). Several sieve holes (16) are opened radially at the upper part of the vertical well (2).

2. The groundwater in-situ treatment device combining horizontal and vertical wells according to claim 1, characterized in that: The vertical well (2) has a wiring hole (17) on its side wall and below the boss (11). The extension section of the pipe (9) and the connecting line of the extraction pump (3) pass through the wiring hole (17) and are sealed at the wiring hole (17).

3. The groundwater in-situ treatment device combining horizontal and vertical wells according to claim 1, characterized in that: The top of the modular processing chamber (4) is provided with a chamber cover (18), and a lifting ring (19) is provided on the upper surface of the chamber cover (18). Both the chamber cover (18) and the bottom of the modular processing chamber (4) are densely covered with through holes.

4. The groundwater in-situ treatment device combining horizontal and vertical wells according to claim 1, characterized in that: The outer surface of the modular processing chamber (4) is in contact with the inner wall of the vertical well (2).

5. A groundwater in-situ treatment device combining horizontal and vertical wells according to claim 1, characterized in that: The vertical well (2) is surrounded by filler (20).

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