Underground water pollution management and control system based on vertical curtain

Abstract

The utility model discloses an underground water pollution management and control system based on a vertical curtain, which comprises an interception wall, the vertical curtain, a water seepage and pumping well and a downstream control well, the vertical curtain is used for separating the water seepage and pumping well from the downstream control well, and the interception wall is used for guiding underground polluted water to flow into the water seepage and pumping well. Liquid level sensing devices are arranged in the water seepage pumping well and the downstream control well, a submersible pump is arranged in the water seepage pumping well, and the submersible pump is started and stopped according to the liquid level monitored by the liquid level sensing devices, so that the liquid level in the water seepage pumping well is lower than the liquid level in the downstream control well. The water pumping basis is provided for the upstream water seepage and pumping well through the liquid level height of the downstream control well, it is ensured that the upstream underground water level is lower than the downstream underground water level, the upstream and the downstream do not form the positive water head difference, it is ensured that the vertical curtain plays a normal blocking effect, and the upstream pollutant diffusion risk of the curtain can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of groundwater pollution prevention and control, in particular to a groundwater pollution control system based on a vertical curtain. Background Technique

[0002] With the development of industrial technology, it is inevitable to cause certain damage to the environment and pollute groundwater to a certain extent. To ensure groundwater safety and slow down the diffusion rate of pollutants in groundwater, a closed circle is generally formed around the pollution source by using a vertical curtain and the surrounding terrain. This treatment method changes the seepage path of groundwater; however, polluted water forms a high water head upstream of the vertical curtain, and the water head difference between the high water head and the downstream groundwater level will weaken the barrier effect of the vertical curtain. In addition, water infiltration extraction wells are arranged at intervals within the closed circle. Through their water infiltration function, the water infiltration extraction wells attract and collect the groundwater flowing through their peripheries. Due to the limited number of water infiltration extraction wells, it is difficult for the water infiltration extraction wells to collect the polluted water whose flow path does not pass through the water infiltration extraction wells. Content of the Utility Model

[0003] The purpose of the utility model is to improve and innovate in view of the disadvantages and problems in the background technique, and provide a groundwater pollution control system based on a vertical curtain.

[0004] A groundwater pollution control system based on a vertical curtain includes an interception wall, a vertical curtain, a water infiltration extraction well and a downstream control well. The vertical curtain is used to separate the water infiltration extraction well and the downstream control well. The interception wall is used to guide the underground polluted water into the water infiltration extraction well. The interception wall extends along the direction perpendicular to the flow of the underground polluted water. The water infiltration extraction well is arranged in the middle of the interception wall. Liquid level sensing devices are arranged in both the water infiltration extraction well and the downstream control well. A submersible pump is also arranged in the water infiltration extraction well. The submersible pump starts and stops according to the liquid level monitored by the liquid level sensing device, so that the liquid level height in the water infiltration extraction well is lower than the liquid level height in the downstream control well.

[0005] A further scheme is that the interception wall includes a gravel layer, the gravel layer is made of graded gravel, and a geotextile separation layer is arranged outside the gravel layer. The geotextile separation layer is used to prevent clay from blocking the gravel pores.

[0006] A further scheme is that the water infiltration extraction well is made of HDPE pipe or reinforced concrete. Holes are reserved in the middle section of the well body of the water infiltration extraction well, and the middle section of the well body of the water infiltration extraction well corresponds to the gravel layer.

[0007] A further solution is that when the liquid level sensing device monitors that the liquid level height in the seepage pumping well reaches the liquid level height in the downstream reference well, the submersible pump is controlled to pump water from the seepage pumping well; when the liquid level sensing device monitors that the liquid level height in the seepage pumping well is lower than the liquid level height in the downstream reference well by a first preset height, the submersible pump is controlled to stop pumping water from the seepage pumping well.

[0008] A further solution is that the well body of the downstream reference well is made of PVC-U pipe, the outside of the well body of the downstream reference well is filled with gravel, the bottom of the downstream reference well extends to a second preset height below the stable groundwater level during the dry season, and the bottom of the downstream reference well is perforated.

[0009] A further solution is that a geotextile separation layer is provided outside the bottom of the downstream reference well.

[0010] A further solution is that the bottoms of the vertical curtain and the seepage pumping well both reach the moderately weathered bedrock layer.

[0011] A further solution is that the seepage pumping well is 3 - 5 m away from the vertical curtain.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model uses the liquid level height of the reference well located downstream to provide a basis for pumping water from the seepage pumping well located upstream, ensuring that the groundwater level upstream is lower than the groundwater level downstream, and no positive water head difference is formed between the upstream and downstream, so as to ensure that the vertical curtain plays a normal blocking effect; in addition, the seepage pumping well is arranged in the middle of the interception wall, and the interception wall extends along the direction perpendicular to the flow direction of the underground polluted water. The main body of the interception wall is a gravel layer. Under the guiding action of the interception wall, the polluted water can conveniently enter the seepage pumping well, so that the seepage pumping well can collect the polluted water whose flow path does not pass through the seepage pumping well; the above measures can greatly reduce the risk of pollutant diffusion upstream of the vertical curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a plan view of a groundwater pollution control system based on a vertical curtain provided by an embodiment of the present utility model;

[0015] Figure 2 It is a cross-sectional view of a seepage pumping well and an interception wall provided by an embodiment of the present utility model;

[0016] Figure 3 This is a schematic cross-sectional view of the downstream control well provided by the embodiment of the present utility model.

[0017] Reference numerals: water infiltration pumping well 1, interception wall 2, vertical curtain 3, downstream control well 4, submersible pump 5, bottom cover 6, top cover 7, geotextile separation layer 8, backfill clay layer 9, gravel layer 10, fixing pier 11, moderately weathered bedrock layer 12. Specific embodiments

[0018] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the accompanying drawings.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] Please refer to Figures 1 - 3 , the present utility model provides a groundwater pollution control system based on a vertical curtain, including an interception wall 2, a vertical curtain 3, a water infiltration pumping well 1, and a downstream control well 4. The vertical curtain 3 is used to separate the water infiltration pumping well 1 and the downstream control well 4. The vertical curtain 3 is made of self-setting mortar and HDPE geomembrane. The bottom of the vertical curtain 3 reaches the moderately weathered bedrock layer 12, and the bottom of the vertical curtain 3 penetrates into the moderately weathered bedrock layer 12 by 8 m. The vertical curtain 3 is used for physical isolation of the polluted site. Among them, the water infiltration pumping wells 1 are arranged at intervals upstream of the vertical curtain 3, and the downstream control wells 4 are arranged at intervals downstream of the vertical curtain 3.

[0022] A liquid level sensing device is provided in each of the seepage pumping well 1 and the downstream control well 4 for monitoring the liquid level height. A submersible pump 5 is also provided in the seepage pumping well 1. The submersible pump 5 starts and stops automatically according to the liquid level monitored by the liquid level sensing device, so that the liquid level height in the seepage pumping well 1 is lower than the liquid level height in the downstream control well 4. When the liquid level sensing device monitors that the liquid level height in the seepage pumping well 1 reaches the liquid level height in the downstream control well 4, the submersible pump 5 is controlled to pump water in the seepage pumping well 1, and the polluted water in the seepage pumping well 1 can be pumped through a pipeline to a sewage treatment tank, which is convenient for centralized treatment of the polluted water; when the liquid level sensing device monitors that the liquid level height in the seepage pumping well 1 is lower than the liquid level height in the downstream control well 4 by a first preset height, the submersible pump 5 is controlled to stop pumping water in the seepage pumping well 1. The first preset height is set to 2m in this embodiment. Thus, using the liquid level height of the downstream control well 4 located downstream to provide a pumping basis for the seepage pumping well 1 located upstream can ensure that the upstream groundwater level is lower than the downstream groundwater level, and no positive head difference will be formed between the upstream and downstream, ensuring that the vertical curtain 3 plays a normal blocking effect, thereby reducing the risk of pollutant diffusion upstream of the vertical curtain 3.

[0023] It should be noted that since the seepage pumping well 1 is at a certain distance from the vertical curtain 3, it is generally set to 3 - 5m. Using the liquid level height of the downstream control well 4 located downstream to provide a pumping basis for the seepage pumping well 1 located upstream, after ensuring that the upstream groundwater level is lower than the downstream groundwater level, a micro-negative pressure is formed between the upstream and downstream of the vertical curtain 3, and then the polluted water between the seepage pumping well 1 and the vertical curtain 3 will also flow into the seepage pumping well 1.

[0024] The interception wall 2 is used to guide the underground polluted water into the seepage pumping well 1. Preferably, the interception wall 2 extends along a direction perpendicular to the flow direction of the underground polluted water, and the seepage pumping well 1 is arranged in the middle of the interception wall 2. It should be noted that in the prior art, since the number of seepage pumping wells 1 is often limited, it is difficult for the seepage pumping well 1 to collect the polluted water whose flow path does not pass through the seepage pumping well 1. Among them, the flow path is as Figure 1 shown by the arrow direction; in this application, by setting the interception wall 2 and the interception wall 2 extending along a direction perpendicular to the flow direction of the underground polluted water, the polluted water whose flow path does not pass through the seepage pumping well 1 will first flow into the interception wall 2, and then under the guiding action of the interception wall 2, it will smoothly enter the seepage pumping well 1, so that the seepage pumping well 1 can collect the polluted water whose flow path does not pass through the seepage pumping well 1, and further reduce the risk of pollutant diffusion upstream of the vertical curtain 3.

[0025] Specifically, the interception wall 3 includes a crushed stone layer 10 made of graded gravel. A geotextile separation layer 8 is arranged outside the crushed stone layer 10 to prevent clay from clogging the pores of the gravel. The upper part of the crushed stone layer 10 is a backfilled clay layer 9, and the lower part of the crushed stone layer 10 is a moderately weathered bedrock layer 12. The well body of the seepage water extraction well 1 is made of HDPE pipe or reinforced concrete. There are reserved holes in the middle section of the well body of the seepage water extraction well 1, and the hole diameter is set to 16 - 20 mm as the seepage water collection channel, and the middle section of the well body of the seepage water extraction well 1 corresponds to the crushed stone layer 10. When the underground polluted water flows along the interception wall 3, it will enter the seepage water extraction well 1 through the reserved holes in the middle section of the well body of the seepage water extraction well 1. In addition, a bottom cover 6 and a top cover 7 are respectively arranged at the bottom and top of the seepage water extraction well 1 to block the seepage water extraction well 1 and prevent sewage from entering from the bottom of the seepage water extraction well 1. In addition, the bottom of the seepage water extraction well 1 also reaches the moderately weathered bedrock layer 12.

[0026] The well body of the downstream control well 4 is made of PVC-U pipe. The downstream control well 4 is fixed to the ground through a fixed pier 11. A bottom cover 6 and a top cover 7 are also respectively arranged at the bottom and top of the downstream control well 4. The middle and lower parts of the outer side of the well body of the downstream control well 4 are filled with crushed stones. The upper part of the outer side of the well body of the downstream control well 4 within 1.0 m from the ground surface is strictly sealed with clay balls, that is, a backfilled clay layer 9 is arranged on the upper part of the outer side of the well body of the downstream control well 4. The bottom of the downstream control well 4 extends to a second preset height below the stable groundwater level during the dry season, so that the downstream control well 4 also has a certain liquid level height during the dry season. The second preset height is also set to 2 m in this embodiment. The bottom of the downstream control well 4 is perforated, and a geotextile separation layer 8 is arranged outside the bottom of the downstream control well 4 to enable groundwater to flow into the downstream control well 4.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

[0028] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0029] Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. The mention of "embodiment" in this article means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0030] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A groundwater pollution control system based on a vertical curtain, characterized in that: It includes an interception wall, a vertical curtain, a seepage pumping well and a downstream control well. The vertical curtain is used to separate the seepage pumping well and the downstream control well. The interception wall is used to guide the underground polluted water into the seepage pumping well. The interception wall extends along the direction perpendicular to the flow of the underground polluted water. The seepage pumping well is arranged in the middle of the interception wall. Liquid level sensing devices are arranged in both the seepage pumping well and the downstream control well. A submersible pump is also arranged in the seepage pumping well. The submersible pump starts and stops according to the liquid level monitored by the liquid level sensing device, so that the liquid level height in the seepage pumping well is lower than the liquid level height in the downstream control well.

2. The groundwater pollution control system based on a vertical curtain according to claim 1, wherein: The interception wall includes a gravel layer, which is made of graded gravel. A geotextile separation layer is arranged outside the gravel layer, and the geotextile separation layer is used to prevent clay from blocking the gravel pores.

3. The groundwater pollution control system based on a vertical curtain according to claim 2, characterized in that: The seepage pumping well is made of HDPE pipe or reinforced concrete. There are reserved holes in the middle section of the well body of the seepage pumping well, and the middle section of the well body of the seepage pumping well corresponds to the gravel layer.

4. A groundwater pollution control system based on a vertical curtain according to claim 1, characterized in that: When the liquid level sensing device monitors that the liquid level height in the seepage pumping well reaches the liquid level height in the downstream control well, the submersible pump is controlled to pump water in the seepage pumping well; when the liquid level sensing device monitors that the liquid level height in the seepage pumping well is lower than the liquid level height in the downstream control well by a first preset height, the submersible pump is controlled to stop pumping water in the seepage pumping well.

5. A groundwater pollution control system based on a vertical curtain according to claim 1, characterized in that: The well body of the downstream control well is made of PVC-U pipe. The outside of the well body of the downstream control well is filled with gravel. The bottom of the downstream control well extends to a second preset height below the stable underground water level during the dry season. The bottom of the downstream control well is perforated.

6. The groundwater pollution control system based on a vertical curtain according to claim 5, characterized in that: A geotextile separation layer is arranged outside the bottom of the downstream control well.

7. A groundwater pollution control system based on a vertical curtain according to claim 1, characterized in that: The bottoms of the vertical curtain and the seepage pumping well both reach the moderately weathered bedrock layer.

8. The groundwater pollution control system based on a vertical curtain according to claim 1, characterized in that: The seepage pumping well is 3 - 5m away from the vertical curtain.

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