Multi-layer aeration type underground water circulation well

Abstract

The utility model relates to a multilayer aeration type underground water circulation well which comprises a well pipe and a well lid arranged in a matched mode, the well pipe comprises at least two aeration spaces arranged in the vertical direction, and every two adjacent aeration spaces are separated through a packer; an aeration unit and a treatment unit are arranged to be matched with any aeration space. According to the device, the underground water circulating well technology is fully utilized, and multi-layer aeration is added, so that the in-situ remediation effect of underground water is effectively enhanced, the gas stripping efficiency is greatly improved, the treatment period is shortened, and the cost is reduced; and meanwhile, compared with a traditional circulating well process, through the dosing device, chemical agents or biological agents can be added, the remediation range is expanded, and the good removal effect on semi-volatile organic compounds can be achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of water, wastewater, sewage or sludge treatment, and in particular to a multi-layer aeration groundwater circulation well. Background Technology

[0002] Groundwater is an important component of water resources. Due to its stable quantity and good quality, it has become one of the important water sources for agricultural irrigation, mining, and cities.

[0003] To strengthen groundwater management, prevent over-extraction and pollution, ensure groundwater quality and sustainable utilization, and promote ecological civilization, the requirements for groundwater management are becoming increasingly detailed, and the groundwater remediation industry is receiving more and more attention. However, practical technologies and methods for effectively remediating and treating groundwater pollution still need to be tested in practice and accumulated with experience. Meanwhile, with the implementation of groundwater control projects in chemical industrial parks, how operating enterprises can dispose of polluted groundwater without affecting normal production are issues that urgently need to be addressed.

[0004] Groundwater remediation technologies include extraction, airlift, air stripping, bioremediation, permeable reactive barrier (PRB) technology, and in-situ chemical remediation. Among these, in-situ groundwater remediation, as a method that directly remediates groundwater in the contaminated area, eliminates the need to extract the contaminated groundwater to the surface. Instead, it treats pollutants directly underground using various physical, chemical, or biological methods. This reduces the need for surface remediation space for ex-situ treatment of extracted groundwater and offers advantages such as targeted remediation and wide applicability, leading to its increasing application in remediation projects. Groundwater Circulation Wells (GCWs), another in-situ groundwater remediation technology, overcomes the drawbacks of high energy consumption and significant disturbance associated with conventional methods. It does not disrupt normal production by coupling multiple remediation technologies such as air stripping, air injection, gas-phase extraction, bioremediation, and chemical oxidation. It fully utilizes the well space to install treatment devices, effectively avoiding the limitations of traditional extraction methods. Furthermore, GCW technology is particularly effective in treating volatile organic compounds (VOCs).

[0005] However, traditional circulating well technology uses pumps to extract groundwater, causing it to circulate within a single well. Volatile gases are separated into water and gas in the upper space, thus removing pollutants from the groundwater. This method is inefficient and time-consuming, leading to increased costs. Utility Model Content

[0006] This invention solves the problems existing in the prior art and provides a multi-layer aerated groundwater circulation well.

[0007] The technical solution adopted by this utility model is a multi-layer aerated groundwater circulation well, including a well pipe and a matching well cover. The well pipe includes at least two aeration spaces arranged in a vertical direction, with two adjacent aeration spaces separated by a packer. An aeration unit and a treatment unit are provided in each aeration space.

[0008] Preferably, a plurality of perforations are distributed on the well pipe corresponding to the lower side wall of any aeration space, and the aeration unit that cooperates with the perforations includes an aeration component.

[0009] Preferably, all aeration holes are located below the groundwater level.

[0010] Preferably, the aeration assembly includes aeration heads that are arranged one-to-one with the aeration spaces, and each aeration head is connected to the aeration device through a corresponding aeration pipe; except for the aeration pipe corresponding to the uppermost aeration space, the other aeration pipes pass through one or more packers in sequence and are fixed by one or more packers in sequence.

[0011] Preferably, the processing unit includes a gas processing unit and a liquid processing unit.

[0012] Preferably, the gas treatment unit includes a gas conduit disposed in the upper part of the aeration space except for the uppermost aeration space. The input end of the gas conduit is disposed in the upper part of the corresponding aeration space, and the output end is disposed in the previous aeration space, and is fixed by a corresponding packer. The gas treatment unit also includes a gas output end and a gas treatment mechanism disposed in conjunction with the uppermost aeration space.

[0013] Preferably, the output end of the gas duct in the uppermost aeration space is located on the side of the gas output end; a gas outlet pipe and a blower are sequentially arranged between the gas output end and the gas treatment mechanism.

[0014] Preferably, the liquid treatment unit includes a liquid extraction pipe that is arranged in conjunction with other aeration spaces except the uppermost aeration space, and the liquid extraction pipe sequentially passes through one or more packers and is fixed in place by one or more packers in turn.

[0015] Preferably, all the pumping pipes are connected to the spray head via a pump outside the well pipe, and the spray head is located at the top inner side of the uppermost aeration space; a dosing channel is also provided in conjunction with the uppermost aeration space.

[0016] Preferably, any of the packers includes an adjustable airbag, the top and bottom of which are disposed between the ends of two adjacent aeration spaces via a fixed panel; the adjustable airbag is configured to cooperate with an air source via an air guide pipe.

[0017] This utility model relates to a multi-layer aerated groundwater circulation well, including a well pipe and a matching well cover. The well pipe includes at least two aeration spaces arranged vertically, with two adjacent aeration spaces separated by a packer. An aeration unit and a treatment unit are provided in each aeration space.

[0018] The beneficial effects of this invention are that it makes full use of groundwater circulation well technology and effectively enhances the in-situ remediation effect of groundwater by adding multi-layer aeration, which greatly improves the gas stripping efficiency, shortens the treatment cycle, and reduces costs. At the same time, compared with the traditional circulation well process, the chemical dosing device can be used to add chemical or biological agents, which expands the remediation range and can also have a better removal effect on semi-volatile organic compounds. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model, taking a two-layer aeration space as an example;

[0020] Figure 2 This is a schematic diagram of the packer in this utility model. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments, but the scope of protection of the present invention is not limited thereto.

[0022] This utility model relates to a multi-layer aerated groundwater circulation well, including a well pipe 1 and a well cover 2. The well pipe 1 includes at least two aeration spaces 3 arranged in a vertical direction, and two adjacent aeration spaces 3 are separated by a packer 4. An aeration unit and a treatment unit are provided in each aeration space 3.

[0023] In this utility model, the circulation well includes a well pipe 1 and a well cover 2. The well cover 2 includes a flange, a pressure gauge 5, and through holes for the aeration unit and the treatment unit. The flange ensures the sealing of the entire circulation well, and the pressure gauge 5 accurately reflects the pressure inside the well.

[0024] Unlike existing technologies, this utility model utilizes a packer 4 to create a "partition" within the well pipe 1, allowing a single well pipe 1 to form at least two aeration spaces 3. These spaces can be used to extract and treat groundwater at different depths, significantly improving treatment efficiency. Obviously, each aeration space 3 is equipped with an aeration unit and a treatment unit at the well pipe 1. The aeration unit is used to complete the aeration treatment within the different aeration spaces 3, while the treatment unit is used to obtain and process the gas and liquid within the different aeration spaces 3.

[0025] In this embodiment, the gas and liquid in different aeration spaces 3 are ultimately led to the uppermost aeration space 3 for centralized treatment.

[0026] A plurality of perforated holes 6 are distributed on the lower sidewall of any aeration space 3 corresponding to the well pipe 1, and the aeration unit that cooperates with the perforated holes 6 includes an aeration component.

[0027] All the holes 6 in the aeration space 3 are located below the groundwater level.

[0028] The aeration assembly includes aeration heads 7 that are arranged one-to-one with the aeration spaces 3. Each aeration head 7 is connected to the aeration device 9 through a corresponding aeration pipe 8. Except for the aeration pipe 8 corresponding to the uppermost aeration space 3, the other aeration pipes 8 pass through one or more packers 4 in sequence and are fixed by one or more packers 4 in sequence.

[0029] In the specific implementation process, each aeration space 3 achieves the connection between the groundwater inside and outside the pipe through the perforated holes 6, and then forces gas into the groundwater through the aeration components to strip off volatile organic pollutants in the liquid and convert them into gas phase. The gas is then extracted and removed by the gas treatment mechanism 12. Under the premise of multi-layer aeration space 3, the groundwater in the lower layer is repeatedly extracted to the upper layer, and the groundwater in the upper layer diffuses to both sides through the upper perforated holes 6 to form a large radius of influence, realizing the circulation of groundwater and accelerating the stripping off of volatile organic compounds in the groundwater, which are then adsorbed and removed by the gas treatment mechanism 12.

[0030] In this invention, gas is generated by the aeration device 9 and output in each aeration space 3 via the corresponding aeration pipe 8 and aeration head 7. Generally, the aeration head 7 is set in the middle and lower area of ​​the corresponding aeration space 3 so that it can fully contact the groundwater.

[0031] During implementation, the gas and liquid treatment operations after aeration are carried out through the gas treatment unit 12 and the liquid treatment unit.

[0032] The gas treatment unit includes a gas conduit 10 that is disposed at the upper part of the aeration space 3 except for the uppermost aeration space 3. The input end of the gas conduit 10 is disposed at the upper part of the corresponding aeration space 3, and the output end is disposed in the previous aeration space 3, and is fixed by a corresponding packer 4. The gas treatment unit also includes a gas output end 11 and a gas treatment mechanism 12 disposed in conjunction with the uppermost aeration space 3.

[0033] The output end of the gas conduit 10 in the uppermost aeration space 3 is located on the side of the gas output end 11; a gas outlet pipe 13 and a blower 14 are arranged sequentially between the gas output end 11 and the gas treatment mechanism 12.

[0034] The liquid treatment unit includes a liquid extraction pipe 15 that is arranged in conjunction with other aeration spaces 3 except for the uppermost aeration space 3. The liquid extraction pipe 15 passes through one or more packers 4 in sequence and is fixed by one or more packers 4 in sequence.

[0035] All of the pumping pipes 15 are connected to the spray head 17 via the pumping pump 16 outside the well pipe 1. The spray head 17 is located on the top inner side of the uppermost aeration space 3. The uppermost aeration space 3 is also equipped with a chemical dosing channel 18.

[0036] In this invention, theoretically, the gas will overflow from each aeration space 3 during the disposal stage after aeration treatment. Therefore, the input end (bottom of the gas conduit 10) of the gas conduit 10 can be set at the upper part of the aeration space 3. These gas conduits 10 are fixed by the packer 4 and finally output gas to the next aeration space 3. The output end of the gas conduit 10 is generally set at the top inside of the previous aeration space 3 to facilitate the gas to be output to the next aeration space 3. In specific implementation, the final gas needs to be treated by the gas treatment mechanism 12 to meet the standards before being discharged.

[0037] In this invention, the gas conduit 10 in the uppermost aeration space 3 has at least two embodiments:

[0038] Firstly, the gas conduit 10 is a straight pipe, with its top set on the side of the gas output end 11 of the uppermost aeration space 3 and kept at a certain distance, ensuring that the gas can be output through the gas output end 11 while the liquid carried out does not overflow through the gas output end 11. At this time, the gas conduit 10 has one fixed force point, namely the corresponding packer 4.

[0039] Secondly, this gas conduit 10 includes an integrally formed and connected straight pipe section and an inverted U-shaped pipe section (such as...). Figure 1 As shown), the bottom of the straight pipe section is connected to the next aeration space 3, and gas is introduced from the next aeration space 3. The existence of the inverted U-shaped pipe section facilitates the overall installation of the gas conduit 10 (at this time there are 2 points of force, namely the corresponding packer 4 and well cover 2), and the gas is output through the bottom output end of the inverted U-shaped pipe section and the gas output end 11, so there is no risk of liquid overflow.

[0040] In this invention, the liquid to be treated in the aeration spaces 3 other than the first aeration space 3 is extracted by the extraction pipe 15. At the same time, the extraction pipe 15 is connected to the extraction pump 16 on the ground. The output end of the extraction pump 16 is connected to the spray head 17 in the first aeration space 3 through the pipe, so that the polluted groundwater extracted from the lower layer is sprayed into the upper space (the first aeration space 3) as fine and dense water droplets. The dosing channel 18 is connected to the dosing pump 19 and the preparation tank 20 and other equipment for preparing and storing the chemical reagents required to react with the pollutants and to dosing the reagents, so that they can react with the output liquid (mist) of the spray head 17.

[0041] Each of the packers 4 includes an adjustable airbag 21, the top and bottom of which are disposed between the ends of two adjacent aeration spaces 3 via a fixed panel 22; the adjustable airbag is configured in conjunction with an air source via an air guide pipe.

[0042] In the specific implementation process, in order to better and more flexibly adjust, the packer 4 can be realized by an adjustable airbag 21. Specifically, it includes at least two fixed panels 22, which are used to confirm the fixed position of its ends with the two adjacent aeration spaces 3. Then, by injecting air into the adjustable airbag 21, the packer 4 is assembled. Its essence is to quickly realize the setting of the aeration space 3 in the well casing 1. Obviously, the fixed panel 22 of the adjustable airbag 21 is a rigid plate with a connector 23 on it for docking with, but not limited to, the gas conduit 10, the liquid extraction pipe 15, and the inflation pipe. The adjustable airbag 21 is connected to the gas source (not shown in the figure) through the gas guide pipe (not shown in the figure) to realize the inflation and deflation of the adjustable airbag 21 and adjust the inflation volume of the adjustable airbag 21.

[0043] The installation of the device of this utility model includes the following steps:

[0044] a. Determine the location and depth of the circulation well based on the hydrogeological conditions of the groundwater pollution area, and drill circulation well holes using a drilling rig, with the final hole located at the bottom of the polluted groundwater aquifer.

[0045] b. Determine the length of well pipe 1 according to the well depth, and set the perforated hole 6 in well pipe 1. Set the specific length and position of the perforated hole 6 according to the pollution conditions.

[0046] c. Install the chemical dosing channel 18, aeration unit, treatment unit and packer 4 in the well casing 1 on the ground and hoist them into the well casing 1;

[0047] d. Connect the wellhead facilities to the well casing 1 facility, and at the same time connect the surface auxiliary equipment to the wellhead facilities;

[0048] e. Regularly maintain and service the equipment and pipelines.

[0049] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A multi-layer aeration groundwater circulation well, comprising a well pipe and a matching well cover, characterized in that: The well casing includes at least two aeration spaces arranged vertically, with adjacent aeration spaces separated by packers; each aeration space is equipped with an aeration unit and a treatment unit.

2. The multi-layer aerated groundwater circulation well according to claim 1, characterized in that: Several perforations are distributed on the lower sidewall of any aeration space corresponding to the well pipe, and the aeration unit that cooperates with the perforations includes an aeration component.

3. A multi-layer aerated groundwater circulation well according to claim 2, characterized in that: All the aeration holes in the aeration spaces are located below the groundwater level.

4. A multi-layer aerated groundwater circulation well according to claim 2, characterized in that: The aeration assembly includes aeration heads that are arranged one-to-one with the aeration spaces. Each aeration head is connected to the aeration device through a corresponding aeration pipe. Except for the aeration pipe corresponding to the uppermost aeration space, the other aeration pipes pass through one or more packers in sequence and are fixed by one or more packers in sequence.

5. A multi-layer aerated groundwater circulation well according to claim 1, characterized in that: The processing unit includes a gas processing unit and a liquid processing unit.

6. A multi-layer aerated groundwater circulation well according to claim 5, characterized in that: The gas treatment unit includes a gas conduit located at the upper part of the aeration space except for the uppermost aeration space. The input end of the gas conduit is located at the upper part of the corresponding aeration space, and the output end is located in the previous aeration space. The conduit is fixed with a corresponding packer. The gas treatment unit also includes a gas output end and a gas treatment mechanism located in conjunction with the uppermost aeration space.

7. A multi-layer aerated groundwater circulation well according to claim 6, characterized in that: The output end of the gas duct in the uppermost aeration space is located on the side of the gas output end; a gas outlet pipe and a blower are arranged sequentially between the gas output end and the gas treatment mechanism.

8. A multi-layer aerated groundwater circulation well according to claim 5, characterized in that: The liquid treatment unit includes a liquid extraction pipe that is configured to cooperate with other aeration spaces except for the uppermost aeration space. The liquid extraction pipe passes through one or more packers in sequence and is fixed by one or more packers in sequence.

9. A multi-layer aerated groundwater circulation well according to claim 8, characterized in that: All of the aforementioned pumping pipes are connected to the spray head via a pump outside the well pipe. The spray head is located on the inner top of the uppermost aeration space. A chemical dosing channel is also provided in conjunction with the uppermost aeration space.

10. A multi-layer aerated groundwater circulation well according to claim 1, characterized in that: Each of the packers includes an adjustable airbag, the top and bottom of which are disposed between the ends of two adjacent aeration spaces via a fixed panel; the adjustable airbag is configured to cooperate with an air source via an air guide pipe.

Images