CN114751472A - Groundwater circulation well device and remediation method for in-situ remediation of contaminated sites - Google Patents

Abstract

The invention belongs to the technical field of groundwater and soil restoration, and relates to a groundwater circulation well device and a restoration method for in-situ restoration of polluted sites. The device includes a circulation well, which has a permeable layer and a sealing layer from top to bottom; the waste gas treatment device, the ozone generator and the saponin solution storage tank are connected to the sealing layer; the sealing layer is equipped with a groundwater suction pipe and a bubble water extraction pipe. A vadose zone is formed between the ground and the water level line of the groundwater; the circulation well is equipped with a micro-nano bubble water output pipeline. The method includes: pumping the groundwater into the closed layer through the groundwater suction pipe; transporting the ozone and the saponin solution of the ozone generator and the saponin solution storage tank into the closed layer; outputting the liquid in the closed layer through the bubble water extraction pipeline to the closed layer. In groundwater; turn on the micro-nano bubble water pump, and transport the liquid in the closed layer to the vadose zone through the micro-nano bubble water output pipeline. The repairing area of the invention is more comprehensive and the repairing effect is good.

Description

Groundwater circulation well device and remediation method for in-situ remediation of contaminated sites

technical field

The invention belongs to the technical field of groundwater and soil restoration, and in particular relates to a groundwater circulation well device and a restoration method for in-situ restoration of polluted sites.

Background technique

At present, the problem of soil and groundwater pollution caused by human activities such as urban landfill, agricultural chemical use, and industrial production is not optimistic. The main pollutants in soil and groundwater are generally divided into inorganic pollutants, organic pollutants, etc., and most polluted areas show compound pollution of multiple pollutants to a certain extent.

Existing remediation technologies for contaminated soil and groundwater can generally be divided into in-situ remediation and ex-situ remediation according to the treatment location. In situ remediation has been widely used due to its advantages of less disturbance to polluted areas, less engineering volume, and better economic benefits. However, the in-situ remediation of polluted soil and polluted groundwater usually takes the two as the main research subjects, and the remediation of the two is carried out separately.

As an in-situ remediation technology for groundwater that can comprehensively utilize chemical, physical, and biological processes, groundwater circulation wells have the potential to be combined with other remediation technologies. It is usually used in combination with the aeration method. By forming a three-dimensional circulating flow field around the circulating well, the circulating flow scours and drives the pollutants into the well, and removes volatile or gas-phase organics through aeration stripping and extraction. The gas process can increase the oxygen content in groundwater and strengthen the degradation of organic pollutants by indigenous microorganisms, thereby realizing the removal of organic pollutants in groundwater and soil.

However, there are still some problems in the combined use of groundwater circulation well technology and aeration method. Problems such as effective treatment, small circulating flow field area or no effective circulation, and short residence time of bubbles in water still exist.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a groundwater circulation well device and a repairing method for in-situ repairing of polluted sites, which can repair soil and groundwater with good repairing effect.

For this purpose, the present invention adopts the following technical solutions:

A groundwater circulation well device for in-situ remediation of polluted sites, comprising a waste gas treatment device on the ground, an ozone generator, a saponin solution storage tank, and a circulation well located below the ground, the circulation wells are staggered from top to bottom. The water-permeable layer and the sealing layer; the waste gas treatment device, the ozone generator and the saponin solution storage tank are connected to the sealing layer;

The closed layer is equipped with a groundwater suction pipe and a bubble water extraction pipe, the groundwater suction pipe is used to input groundwater into the closed layer, and the bubble water extraction pipe is used to output the liquid in the closed layer to groundwater middle;

A vadose zone is formed between the ground and the water level of the groundwater;

The circulation well is equipped with a micro-nano bubble water output pipeline, and the micro-nano bubble water output pipeline is equipped with a micro-nano bubble water pump and extends into the closed layer through the connected micro-nano bubble water extraction pipeline; the The micro-nano bubble water output pipeline is used to transport the liquid of the closed layer to the vadose zone area.

Preferably, the micro-nano bubble water output pipe is installed on the water-permeable layer, and both ends extend through the sidewall of the water-permeable layer to the vadose zone region.

Preferably, the ozone generator is connected with an ozone transportation pipeline, the ozone transportation pipeline is formed with at least two branch pipelines, and each branch pipeline of the ozone transportation pipeline extends into each of the closed layers respectively.

Preferably, an aeration head is respectively installed at the outlet end of each branch pipe of the ozone transport pipe.

Preferably, the aeration head can generate micro-nano bubbles with diameters below 200 nm.

Preferably, the groundwater circulation well device for in-situ restoration of the polluted site further includes a groundwater treatment device, and the groundwater treatment device is a heavy metal pollutant treatment device.

Preferably, the groundwater circulation well device for in-situ remediation of contaminated sites further comprises a dual-purpose transportation pipeline, the dual-purpose transportation pipeline includes a main pipeline, and one end of the main pipeline of the dual-purpose transportation pipeline forms two branch pipelines on the ground , the other end of the main pipeline of the dual-purpose transportation pipeline forms at least two branch pipelines underground; a branch pipeline on the ground of the dual-purpose transportation pipeline is installed with a pipeline valve and the saponin solution storage tank, and the other The groundwater treatment device is installed on the branch pipeline on the ground; the underground branch pipeline of the dual-purpose transportation pipeline extends downward into the closed layer.

Preferably, an infusion pump is detachably installed on the main pipeline of the dual-purpose transportation pipeline, and the direction of the infusion pump is adjustable.

A groundwater remediation method for in-situ remediation of contaminated sites, comprising the above-mentioned groundwater circulation well device for in-situ remediation of contaminated sites and the steps:

drawing groundwater into the sealing layer through the groundwater suction pipe;

transporting the ozone and the saponin solution of the ozone generator and the saponin solution storage tank into the sealing layer;

outputting the liquid in the closed layer to the groundwater through the bubble water extraction pipeline;

The micro-nano bubble water pump is turned on, and the liquid in the sealing layer is transported to the vadose zone region through the micro-nano bubble water output pipe.

Preferably, the liquid in the closed layer is pumped to a groundwater treatment device for heavy metal pollutant treatment, and then the treated water is re-transported into the closed layer.

The beneficial effect of the groundwater circulation well device and the repairing method for in-situ repair of polluted sites of the present invention is that: by setting the micro-nano bubble water output pipeline, the liquid in the sealing layer is transported to the vadose zone area, so that the vadose water can also be treated. The soil and sewage in the belt area are repaired, the repair area is more comprehensive, and the repair effect is good.

Description of drawings

FIG. 1 is a schematic structural diagram of a groundwater circulation well device for in-situ remediation of contaminated sites according to an embodiment of the present invention.

The names and labels of the parts in the figure are as follows:

Exhaust gas treatment device (1); ozone generator (2); air pump (3); ozone transportation pipeline (4); exhaust gas extraction pump (5); exhaust gas extraction pipeline (6); dual-purpose transportation pipeline (7) ; Suction pump (8); Pipe valve (9); Saponin solution storage tank (10); Groundwater treatment device (11); The second permeable layer (13b); the third permeable layer (13c); the packer (14); the groundwater extraction pump (15); the bubble water extraction pump (16); the water level sensor (17); the aeration head (18) ); the first sealing layer (19); the second sealing layer (20); the micro-nano bubble water output pipe (21); the groundwater suction pipe (22); the upper short pipe (22a); the bubble water extraction pipe (23); The lower short pipe (23a); the micro-nano bubble water extraction pipe (24); the impermeable cement wall (25); the water level line (100); the vadose zone (200).

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

As shown in FIG. 1 , this embodiment discloses a groundwater circulation well device for in-situ repair of a polluted site. The groundwater circulation well device for in-situ remediation of the polluted site includes a ground part and a part below the ground. A vadose zone 200 is formed between the ground and the water level line 100 of the groundwater.

The ground part includes exhaust gas treatment device 1, ozone generator 2, air pump 3, ozone transportation pipeline 4, exhaust gas extraction pump 5, exhaust gas extraction pipeline 6, dual-purpose transportation pipeline 7, suction pump 8, pipeline valve 9, soap Elemental solution storage tank 10 and groundwater treatment device 11.

The part below the ground is provided with a circulation well. The circulating well includes a micro-nano bubble water pump 12, a micro-nano bubble water extraction pipeline 24, a micro-nano bubble water output pipeline 21, a groundwater suction pipe 22, a groundwater extraction pump 15, a bubble water extraction pipeline 23, and a bubble water extraction pump 16. Water level sensor 17.

The circulation well has a permeable layer and a sealing layer from top to bottom. In this embodiment, three permeable layers and two closed layers are used to illustrate the groundwater circulation well device for in-situ restoration of contaminated sites in this embodiment. In other embodiments, the number and arrangement of the water-permeable layer and the sealing layer can be set as required.

As shown in FIG. 1 , the sealing layer in this embodiment is divided into a first sealing layer 19 and a second sealing layer 20 . The water-permeable layers are the first water-permeable layer 13a, the second water-permeable layer 13b, and the third water-permeable layer 13c, respectively. From top to bottom, the circulation well is a first permeable layer 13a, a first closed layer 19, a second permeable layer 13b, a second closed layer 20, and a third permeable layer 13c. The first water permeable layer 13a extends downward from the ground, and extends below the water level 100 through the vadose zone 200 . The first sealing layer 19 , the second water-permeable layer 13 b , the second sealing layer 20 , and the third water-permeable layer 13 c are all located below the water level 100 .

The side walls of the first water-permeable layer 13a, the second water-permeable layer 13b, and the third water-permeable layer 13c in this embodiment are made of quartz sand. In this embodiment, the first permeable layer 13a, the second permeable layer 13b, and the third permeable layer 13c can make the groundwater circulate better under the action of the circulation well, so as to improve the repair effect.

The side walls of the first sealing layer 19 and the second sealing layer 20 are respectively impermeable cement walls 25 . Packers 14 are respectively provided above and below the first sealing layer 19 and the second sealing layer 20 . Specifically, the first sealing layer 19 is a closed cavity surrounded by the upper and lower packers 14 and the impermeable cement wall 25 . The second sealing layer 20 is a closed cavity surrounded by two upper and lower packers 14 and an impermeable cement wall 25 . The first sealing layer 19 and the second sealing layer 20 are respectively capable of blocking water, so as to provide a basis for the control of the cyclic repairing process.

An exhaust gas extraction pipe 6 is connected to the exhaust gas treatment device 1 of this embodiment. Specifically, the exhaust gas extraction pipeline 6 includes a main pipeline, one end of the main pipeline of the exhaust gas extraction pipeline 6 is connected to the exhaust gas treatment device 1, and the other end of the main pipeline of the exhaust gas extraction pipeline 6 is formed with two branch pipelines. The exhaust gas extraction pump 5 is installed on the main pipe of the exhaust gas extraction pipe 6 . One branch pipe of the exhaust gas extraction pipe 6 extends downward into the first closed layer 19 , and another branch pipe of the exhaust gas extraction pipe 6 extends downward into the second closed layer 20 .

The ozone generator 2 in this embodiment is connected with an ozone transport pipeline 4 . Specifically, the ozone transportation pipeline 4 includes a main pipeline, one end of the main pipeline of the ozone transportation pipeline 4 is connected to the ozone generator 2 , and an air pump 3 is installed on the main pipeline of the ozone transportation pipeline 4 . The other end of the main pipe of the ozone transport pipe 4 is formed with two branch pipes. A branch pipe of the ozone transport pipe 4 extends downward into the first sealing layer 19 and an aeration head 18 is installed at the end of the branch pipe. Another branch pipe of the ozone transport pipe 4 extends downward into the second sealing layer 20 and an aeration head 18 is installed at the end of the branch pipe.

The dual-purpose transportation pipeline 7 in this embodiment includes a main pipeline. One end of the main pipeline of the dual-purpose transportation pipeline 7 forms two branch pipelines on the ground, and the other end of the main pipeline for the dual-purpose transportation pipeline 7 forms two underground branch pipelines.

A pipeline valve 9 and a saponin solution storage tank 10 are installed on one ground branch pipe of the dual-purpose transportation pipeline 7 , and a groundwater treatment device 11 is installed on the other ground branch pipe. The direction of the infusion pump 8 in this embodiment is adjustable, and the infusion pump 8 can be detachably installed on the dual-purpose transportation pipeline 7 . Specifically, the infusion pump 8 is detachably installed on the main pipeline of the dual-purpose transportation pipeline 7 .

One underground branch pipe of the dual-purpose transport pipeline 7 protrudes downward into the first closed layer 19 , and another underground branch pipeline of the dual-purpose transport pipeline 7 extends downward into the second closed layer 20 .

The groundwater treatment device 11 of this embodiment is a pollutant treatment device such as heavy metals, and can treat heavy metals and other pollutants.

A horizontal micro-nano bubble water output pipe 21 is installed on the first water-permeable layer 13a in this embodiment. The micro-nano bubble water output pipe 21 is located below the ground and above the water level 100 . Both ends of the micro-nano bubble water output pipe 21 protrude from the side wall of the first water permeable layer 13 a to enter the vadose zone 200 . The micro-nano bubble water pump 12 is installed in the middle of the micro-nano bubble water output pipe 21 . The micro-nano bubble water pump 12 is a submersible pump. The middle of the micro-nano bubble water output pipe 21 is also connected with a micro-nano bubble water extraction pipe 24 . The micro-nano bubble water extraction pipe 24 extends downward from the micro-nano bubble water output pipe 21 to the closed layer. The sealing layer in this embodiment is the first sealing layer 19 . In other embodiments, the micro-nano bubble water extraction pipeline 24 may also extend downward to other closed layers.

At present, the soil in the 200 part of the vadose zone has not been repaired, and the treatment area is not comprehensive. In this embodiment, the soil in the vadose zone 200 can also be repaired, and the pollution treatment area is more comprehensive.

A horizontal groundwater suction pipe 22 is attached to the side wall of the first permeable layer 13a below the water level 100 . The two ends of the groundwater suction pipe 22 respectively protrude from the side wall of the first permeable layer 13a to enter the groundwater. A groundwater extraction pump 15 and an upper short pipe 22 a are installed in the middle of the groundwater suction pipe 22 , and the upper short pipe 22a extends downward from the groundwater suction pipe 22 to the top inner cavity of the first sealing layer 19 . A water level sensor 17 is installed on the upper short pipe 22a to detect whether the water in the inner cavity of the first sealing layer 19 is at a high water level.

A horizontal bubble water extraction pipe 23 is installed on the side wall of the second water permeable layer 13b. Both ends of the bubble water extraction pipe 23 respectively protrude from the side wall of the first permeable layer 13a to enter the groundwater. The bubble water extraction pump 16 and the lower short pipeline 23a are installed in the middle of the bubble water extraction pipe 23 . The lower short pipe 23a extends upward from the sparkling water extraction pipe 23 to the bottom inner cavity of the first sealing layer 19 . A water level sensor 17 is installed on the lower short pipe 23a to detect whether the water in the inner cavity of the first sealing layer 19 is at a low water level.

Similarly, the second closed layer 20 is also provided with a groundwater suction pipe 22 , a groundwater extraction pump 15 , a bubble water extraction pipe 23 , a bubble water extraction pump 16 , and a water level sensor 17 . The groundwater suction pipe 22 disposed in the second sealing layer 20 is installed at the bottom of the second permeable layer 13b. The bubble water extraction pipe 23 disposed in the second sealing layer 20 is located in the third water permeable layer 13c.

The groundwater remediation method for in-situ remediation of contaminated sites in this embodiment is based on the above-mentioned groundwater circulation well device for in-situ remediation of contaminated sites. Methods as below:

The groundwater is pumped into the closed layer through the groundwater suction pipe 22;

The ozone and the saponin solution of the ozone generator 2 and the saponin solution storage tank 10 are transported into the sealing layer;

The liquid in the closed layer is output to the groundwater through the bubble water extraction pipeline 23;

The micro-nano bubble water pump 12 is turned on, and the liquid in the closed layer is transported to the area of the vadose zone 200 through the micro-nano bubble water output pipe 21 .

The liquid in the closed layer is pumped to the groundwater treatment device 11 for heavy metal pollutant treatment, and then the treated water is re-transported into the closed layer.

The specific method is:

Step 1: The groundwater extraction pump 15 starts to work, and the groundwater is pumped into the first sealing layer 19 and the second sealing layer 20 through the groundwater suction pipe 22 and the upper short pipe 22a. When the water level sensor 17 senses that the water level is about to reach a preset height, that is, when the water level is about to reach the capacity of the sealing layer, the groundwater extraction pump 15 stops working.

Step 2: The pipeline valve 9 is opened, and the infusion pump 8, the ozone generator 2 and the air pump 3 start to operate. The ozone and high-concentration saponin solution are delivered to the first sealing layer 19 and the second sealing layer 20 . The aeration head 18 starts to work, continuously aerates the groundwater in the first closed layer 19 and the second closed layer 20, and generates micro-nano bubbles with a particle size below 200 nm. At the same time, the exhaust gas extraction pump 5 starts to work to extract the aeration process. The waste gas generated in the waste gas is pumped to the waste gas treatment device 1 for treatment. After a period of time, the input of ozone and high-concentration saponin solution to the first sealing layer 19 and the second sealing layer 20 is stopped.

Step 3: Turn on the micro-nano bubble water pump 12 , and transport the liquid in the closed layer to the area of the vadose zone 200 through the micro-nano bubble water output pipe 21 . The sparkling water pump 16 is turned on, and the liquids in the first sealing layer 19 and the second sealing layer 20 are transported into the groundwater. When the water level sensor 17 detects that the liquid level of the first sealing layer 19 and the second sealing layer 20 is approaching the bottom, both the micro-nano bubble water pump 12 and the bubble water pump 16 stop working. At this point, a cycle ends.

Repeat steps 1 to 3 for the next cycle.

When the circulation of groundwater is completed, pollutants such as heavy metals washed out from the soil need to be treated. The groundwater needs to be pumped into the groundwater treatment device 11 . Specifically, the suction pump 8 is reversely installed, the pipeline valve 9 is closed, the suction pump 8 is operated, the groundwater extraction pump 15 is turned on, and the groundwater is continuously pumped to the groundwater treatment device 11 . After treatment, the treated fluid is re-delivered to the circulation well.

In this embodiment, the liquid in the sealing layer is transported to the area of the vadose zone 200 through the micro-nano bubble water output pipe 21 . The liquid is micro-nano bubble water containing two components, saponin and ozone, and can remediate soil and groundwater in the vadose zone 200 area. In the process of multiple cycles, the soil and groundwater in the vadose zone 200 area can be fully repaired.

In this embodiment, the concentration of the saponin solution in the saponin solution storage tank 10 can be set as required. A higher concentration and smaller volume of saponin solution can be appropriately configured, mainly because the saponin solution will be automatically diluted after being injected into the groundwater. Saponin solution is a bio-friendly surfactant, which can remove inorganic pollutants and organic pollutants. The concentration of the saponin solution used in this example was 125 mg/L.

In this embodiment, groundwater circulation well technology, aeration technology, and in-situ leaching technology are combined to perform in-situ restoration of a site where both groundwater and soil are polluted. Only a single well can achieve better repair function and save costs.

The circulating water in this embodiment flows smoothly, and the residence time of the micro-nano bubbles in the polluted area can be increased, thereby enhancing the removal effect of pollutants.

In this embodiment, the polluted soil in the vadose zone 200 can be rinsed through the circulation well to realize the circulatory rinsing, so as to increase the seepage velocity of the eluent, and it is not necessary to build a separate extraction well.

In this embodiment, the multi-level aeration head 18 can expand the circulating flow field area of the groundwater circulating well, so as to expand the remediation scope of groundwater and soil pollution areas below the groundwater level, and can increase the content of strong oxidizing substances in groundwater, improve Contaminant removal effect. By introducing the bio-friendly surfactant saponin, the in-situ rinsing process for polluted soil below the groundwater level is directly nested into the groundwater circulation well, which can not only reduce water consumption, saponin consumption, and environmental pollution, but also Completely abandoning the extraction wells directly related to the in-situ leaching process can achieve simultaneous restoration of soil and groundwater, and can also increase the total residence time of the leaching agent in the soil and improve the leaching effect. In addition, by adding ozone gas source and generating micro-nano bubbles with a particle size below 200nm, the residence time of strong oxidizing substances in groundwater can be increased, thereby improving the removal rate of organic pollutants in groundwater and soil.

In this embodiment, the aeration head 18 directly aerates groundwater at different levels, saves water consumption, reduces transmission distance, and can generate micro-nano bubbles with a diameter of less than 200 nm, so that small bubbles containing strong oxidants can exist in groundwater for a longer time time, so as to have a better removal effect on pollutants.

The aeration head 18 of this embodiment can generate more micro-nano bubbles per unit time, thereby increasing the content of the fortifier per unit time and unit volume in the entire groundwater area.

This embodiment can provide stronger circulation power for the groundwater circulation flow field area through multiple independent closed layers and multi-level pumping and pumping, and build a smoother groundwater circulation flow field.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. The underground water circulating well device for in-situ remediation of the polluted site is characterized by comprising an exhaust gas treatment device (1) positioned on the ground, an ozone generator (2), a saponin solution storage tank (10) and a circulating well positioned below the ground, wherein the circulating well is provided with a permeable layer and a sealing layer which are arranged in a staggered mode from top to bottom; the waste gas treatment device (1), the ozone generator (2) and the saponin solution storage tank (10) are communicated to the sealing layer;

the closed layer is provided with a groundwater suction pipe (22) and a bubble water pumping pipeline (23), the groundwater suction pipe (22) is used for inputting groundwater into the closed layer, and the bubble water pumping pipeline (23) is used for outputting liquid in the closed layer to groundwater;

an aeration zone (200) is formed between the ground and a water level line (100) of the underground water;

the circulation well is provided with a micro-nano bubble water output pipeline (21), the micro-nano bubble water output pipeline (21) is provided with a micro-nano bubble water pumping and injecting pump (12) and extends into the sealing layer through a connected micro-nano bubble water extraction pipeline (24); the micro-nano bubble water output pipeline (21) is used for conveying the liquid of the closed layer to the area of the aeration zone (200).

2. A groundwater circulating well device for in-situ remediation of a contaminated site as claimed in claim 1, wherein: micro-nano bubble water output pipeline (21) are installed on the permeable layer and both ends pass the lateral wall on permeable layer stretches out to it is regional to bordure area (200).

3. A groundwater circulating well device for in situ remediation of a contaminated site as claimed in claim 1, wherein: ozone transport pipe way (4) are connected with on ozone generator (2), ozone transport pipe way (4) are formed with two at least branch pipelines just each branch pipeline of ozone transport pipe way (4) stretches into each respectively the seal coat.

4. A groundwater circulating well device for in situ remediation of a contaminated site as claimed in claim 3, wherein: and the outlet ends of all branch pipelines of the ozone conveying pipeline (4) are respectively provided with an aeration head (18).

5. A groundwater circulating well device for in-situ remediation of a contaminated site as claimed in claim 4, wherein: the aeration head (18) can generate micro-nano bubbles with the diameter of less than 200 nm.

6. A groundwater circulating well device for in situ remediation of a contaminated site as claimed in claim 1, wherein: the underground water circulating well device for in-situ remediation of the polluted site further comprises an underground water treatment device (11), wherein the underground water treatment device (11) is a heavy metal pollutant treatment device.

7. A groundwater circulating well device for in-situ remediation of a contaminated site as claimed in claim 6, wherein: the underground water circulating well device for in-situ remediation of the polluted site further comprises a dual-purpose conveying pipeline (7), wherein the dual-purpose conveying pipeline (7) comprises a main pipeline, one end of the main pipeline of the dual-purpose conveying pipeline (7) forms two branch pipelines on the ground, and the other end of the main pipeline of the dual-purpose conveying pipeline (7) forms at least two branch pipelines underground; a pipeline valve (9) and the saponin solution storage tank (10) are arranged on a branch pipeline on one ground of the dual-purpose transport pipeline (7), and the underground water treatment device (11) is arranged on a branch pipeline on the other ground; and underground branch pipelines of the double-purpose transport pipeline (7) extend downwards into the closed layer.

8. A groundwater circulating well device for in-situ remediation of a contaminated site as claimed in claim 7, wherein: the main pipeline of the double-purpose transport pipeline (7) is detachably provided with a pumping and injection pump (8), and the direction of the pumping and injection pump (8) is adjustable.

9. A groundwater remediation method for in-situ remediation of a contaminated site, comprising the groundwater circulation well device for in-situ remediation of a contaminated site according to any one of claims 1 to 8 and the steps of:

pumping groundwater into the enclosure through the groundwater pumping pipe (22);

conveying the ozone of the ozone generator (2) and the saponin solution storage tank (10) and the saponin solution into the sealing layer;

outputting the liquid in the closed layer to underground water through the bubble water extraction pipeline (23);

and (3) opening the micro-nano bubble water pumping and injecting pump (12), and conveying the liquid in the closed layer to the area of the aeration zone (200) through the micro-nano bubble water output pipeline (21).

10. A groundwater remediation method of in situ remediation of a contaminated site as claimed in claim 9, wherein: pumping the liquid in the sealing layer into a groundwater treatment device (11) for heavy metal pollutant treatment, and then delivering the treated water into the sealing layer again.

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