In-situ simultaneous remediation system and method for soil and groundwater

Abstract

This invention discloses a system and method for in-situ synchronous remediation of soil and groundwater, relating to the field of soil and groundwater remediation technology. It includes a remediation well, a water injection / extraction assembly, an active reaction assembly, a leaching assembly, and a control assembly. The water injection / extraction assembly extracts groundwater from the upper or lower aquifer to the active reaction assembly, where it is mixed and reacted with a remediation agent. The assembly can also reinject the reacted groundwater from the active reaction assembly back into the upper or lower aquifer. The leaching assembly extracts the reacted groundwater from the active reaction assembly to leach the soil. The control assembly is communicatively connected to the water injection / extraction assembly, the active reaction assembly, and the leaching assembly, and is used to control their operation. The in-situ synchronous remediation system and method for soil and groundwater provided by this invention can achieve synchronous in-situ remediation of soil and groundwater, improving remediation efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil and groundwater remediation, in particular to a soil and groundwater in-situ synchronous remediation system and method. BACKGROUND

[0002] With the continuous advancement of urbanization, industrialization and agricultural modernization, soil and groundwater pollution problems caused by human activities such as industrial and mining activities and agriculture are becoming increasingly serious. Due to the influence of leakage, irrigation, rainfall leaching and other effects, the pollutants in the soil migrate to the groundwater, causing groundwater pollution; the fluctuation of groundwater level, runoff and discharge cause the further spread of groundwater pollutants, causing greater range of groundwater pollution, so the problem of coexistence of soil and groundwater pollution is common in contaminated sites. China pays more attention to soil environmental management than groundwater, and the soil pollution remediation technology is much stronger than groundwater, and there is a significant technical gap in groundwater pollution remediation. Moreover, the commonly used remediation technology often only focuses on solving the problem of soil or groundwater pollution, and the overall remediation effect, cost, time consumption and long-term stability of the contaminated site are difficult to meet the remediation requirements, and the simultaneous treatment of soil and groundwater pollution is difficult.

[0003] With the continuous development of the environmental protection industry towards economic and environmental benefits, in-situ remediation technology has obvious advantages; in-situ soil leaching technology is one of the more economical technologies for in-situ soil remediation, but it is easy to cause secondary pollution of groundwater; the extraction-treatment technology is the most widely used groundwater remediation technology, which is characterized by quick effect and low cost in high-concentration pollution area treatment, but has the disadvantages of tailing, rebound, and large burden on surface water treatment in long-term use, and may cause safety hazards such as ground subsidence when used alone; the groundwater circulation well technology can create three-dimensional hydraulic circulation of groundwater through water power regulation, effectively control the range of groundwater pollution, cooperate with injection of remediation reagents, promote mass transfer and distribution in the aquifer, and realize in-situ rapid removal of pollutants; but when soil and groundwater are both contaminated, the above technologies cannot realize in-situ synchronous remediation of soil and groundwater. SUMMARY

[0004] The purpose of the present application is to provide a soil and groundwater in-situ synchronous remediation system and method to solve the problems existing in the prior art and to realize in-situ synchronous remediation of soil and groundwater and improve remediation efficiency.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] This invention provides an in-situ synchronous remediation system for soil and groundwater, comprising a remediation well, a water injection / extraction assembly, an active reaction assembly, a leaching assembly, and a control assembly. The remediation well is installed within the soil, its bottom is sealed, and it is positioned within a lower aquifer. The remediation well contains, from top to bottom, a first chamber, a second chamber, a third chamber, and a fourth chamber, separated by partitions. The first and second chambers are connected to the upper aquifer, and the third and fourth chambers are connected to the lower aquifer. The water injection / extraction assembly is connected to all four chambers. The active reaction assembly is connected to the water injection / extraction assembly and contains a remediation agent. The remediation agent is described in the following: the water pumping and injection assembly can pump groundwater from the upper or lower aquifer to the active reaction assembly and mix it with the remediation agent; the water pumping and injection assembly can also reinject the groundwater from the active reaction assembly back into the upper or lower aquifer; the leaching assembly is connected to the active reaction assembly, is arranged around the remediation well and can be buried in the soil layer, and is used to pump the groundwater from the active reaction assembly and leach the soil; the control assembly is communicatively connected to the water pumping and injection assembly, the active reaction assembly and the leaching assembly, and is used to control the operation of the water pumping and injection assembly, the active reaction assembly and the leaching assembly.

[0007] Preferably, a first barrier, a second barrier, and a third barrier are sequentially arranged from top to bottom inside the repair well. The first barrier is flush with the middle of the upper aquifer, the second barrier is flush with the upper part of the impermeable layer, and the third barrier is flush with the middle of the lower aquifer. The outer peripheral walls of the first, second, and third barriers can be sealed and fitted to the inner wall of the repair well to form the first cavity, the second cavity, the third cavity, and the fourth cavity. Furthermore, the first, second, and third barriers are all connected to the control component, which is used to individually control the deformation of the first, second, and third barriers to seal and fit or detach them from the inner wall of the repair well.

[0008] Preferably, the system further includes a gas supply assembly, wherein the first barrier, the second barrier, and the third barrier are all configured as gas barriers; the gas supply assembly includes a gas pipeline, one end of which is connected to an external gas source, and the other end extends into the repair well and is connected to the first barrier, the second barrier, and the third barrier; the gas pipeline is equipped with a first gas valve, a second gas valve, and a third gas valve that are communicatively connected to the control assembly, the first gas valve, the second gas valve, and the third gas valve being used to control the connection and disconnection between the first barrier, the second barrier, and the third barrier and the gas pipeline; the gas pipeline is equipped with a gas pressure monitoring component that is communicatively connected to the control assembly, and the gas pipeline is used to pressurize or depressurize the first barrier, the second barrier, and the third barrier.

[0009] Preferably, the inner walls of the first cavity, the second cavity, the third cavity, and the fourth cavity are respectively provided with a first permeable section, a second permeable section, a third permeable section, and a fourth permeable section, so that the first cavity and the second cavity can be connected to the upper aquifer, and the third cavity and the fourth cavity can be connected to the lower aquifer.

[0010] Preferably, the upper part of the first permeable section is lower than the water level of the upper aquifer, and the first and second permeable sections are symmetrical about the first barrier in the axial direction of the repair well; the upper part of the third permeable section is lower than the water level of the lower aquifer, and the third and fourth permeable sections are symmetrical about the third barrier in the axial direction of the repair well.

[0011] Preferably, the water injection assembly includes a first connecting component, a second connecting component, a third connecting component, and a fourth connecting component, all of which are communicatively connected to the control component. The first connecting component is connected at both ends to the first cavity and the active reaction component, the second connecting component is connected at both ends to the second cavity and the active reaction component, the third connecting component is connected at both ends to the third cavity and the active reaction component, and the fourth connecting component is connected at both ends to the fourth cavity and the active reaction component. The control component is used to control the operation of the first connecting component, the second connecting component, the third connecting component, and the fourth connecting component to enable groundwater flow between the active reaction component and the first cavity, the second cavity, the third cavity, or the fourth cavity.

[0012] Preferably, the active reaction assembly includes an active reaction tank, a liquid level monitoring component, and a contaminant concentration monitoring component. The active reaction tank contains the remediation agent. The active reaction tank is connected to the water injection component and the rinsing component. The liquid level monitoring component is communicatively connected to the control component and is used to monitor the liquid level information of the active reaction tank. The contaminant concentration monitoring component is communicatively connected to the control component and is used to monitor the contaminant concentration information in the active reaction tank.

[0013] Preferably, the rinsing assembly includes a main pipeline assembly and multiple circumferentially distributed branch pipelines. One end of the main pipeline assembly is connected to the active reaction assembly, and the other end is connected to all of the multiple branch pipelines. The main pipeline assembly is equipped with a flow monitoring component that is communicatively connected to the control component. Each of the branch pipelines is equipped with a flow control component that is communicatively connected to the control component, and the portion of each branch pipeline used for burying in the soil layer is equipped with multiple spray heads along its length. The main pipeline assembly is communicatively connected to the control component, and the control component is used to control the operation of the main pipeline assembly to control the connection and disconnection between each of the branch pipelines and the active reaction assembly.

[0014] Preferably, the system further includes a first water level monitoring component and a second water level monitoring component respectively disposed at the bottom of the first cavity and the third cavity. Both the first water level monitoring component and the second water level monitoring component are communicatively connected to the control component and are used to monitor the water level information in the first cavity and the third cavity.

[0015] The present invention also provides a method based on the above-mentioned in-situ synchronous remediation system for soil and groundwater, comprising the following steps:

[0016] Under the control of the control component, the water injection component draws groundwater from the fourth chamber into the active reaction component to mix and react with the remediation agent. The leaching component leaches the soil with the groundwater mixed and reacted in the active reaction component. After the leaching liquid flows into the upper aquifer, the water injection component draws groundwater from the first chamber into the active reaction component, so that the groundwater in the upper aquifer can be drawn into the first chamber. At the same time, the water injection component draws the groundwater mixed and reacted in the active reaction component and injects it into the second chamber, so that the groundwater in the second chamber can be reinjected into the upper aquifer, forming a hydraulic cycle in the upper aquifer. Under the control of the control component, the groundwater mixed with the remediation agent is added to the third injection chamber to mix with the groundwater in the lower aquifer.

[0017] The present invention achieves the following technical effects compared to the prior art:

[0018] The soil and groundwater in-situ synchronous remediation system provided by this invention includes remediation wells. Each well contains a first and a second cavity communicating with the upper aquifer, allowing groundwater from the upper aquifer to flow through these cavities. It also contains a third and a fourth cavity communicating with the lower aquifer, allowing groundwater from the lower aquifer to flow through these cavities as well. This facilitates groundwater circulation. During the remediation process, under the control of a control component, a water injection component can pump water through either the first or second cavity, and through either the third or fourth cavity. The system extracts groundwater from the upper or lower aquifer and injects it into the active reaction component to mix with remediation agents for treatment, achieving extraction-treatment. Simultaneously, the groundwater mixed with the remediation agents can leach the soil under the action of the leaching component. Since the leaching solution is groundwater mixed with remediation agents, it can remediate the soil, achieving in-situ soil leaching remediation. The leaching solution flows to the upper aquifer under gravity, and the pumping and injection component draws water from the first or second chamber, promoting the vertical migration of the leaching solution, thereby shortening the remediation cycle. Furthermore, the extraction... After the water injection component extracts groundwater and mixes it with the remediation agent for treatment, the groundwater mixed with the remediation agent in the active reaction component can be directly injected into the corresponding cavity. By regulating the water injection and extraction in different cavities, groundwater hydraulic circulation is achieved, thereby remediating groundwater pollution in the lower or upper aquifers. In other words, this invention constructs an integrated soil and water remediation system by coupling in-situ soil leaching technology and groundwater extraction-treatment technology, realizing in-situ simultaneous remediation of soil and groundwater pollution. The use of in-situ soil leaching combined with hydraulic circulation regulation fully utilizes the advantages of each component. This technological advantage leverages the strengths of both approaches to mitigate the risks of groundwater pollution associated with in-situ soil leaching. Vertically-based hydraulic circulation control enhances pollutant removal efficiency, mitigates the tailing-rebound side effects during aquifer remediation, and significantly strengthens mass transfer of remediation agents within the aquifer, shortening the remediation cycle and achieving efficient in-situ simultaneous remediation of soil and water pollution. The integrated in-situ soil leaching and groundwater circulation treatment remediation technology system allows for the replacement of remediation agents based on the target pollutant type and remediation objectives, offering high flexibility in technology combinations.

[0019] This invention also provides a method for in-situ remediation of soil and groundwater. Under the control of a control component, a water injection component extracts groundwater from the lower aquifer and mixes it with a remediation agent in an active reaction component. A leaching component uses the groundwater mixed in the active reaction component to leach the soil. Once the leaching solution flows into the upper aquifer, the water injection component extracts groundwater from the upper aquifer and returns it to the active reaction component. Simultaneously, the water injection component extracts the groundwater mixed in the active reaction component and reinjects it into the upper aquifer, forming a hydraulic cycle in the upper aquifer. Under the control of the control component, groundwater mixed with the remediation agent is added to the lower aquifer for further mixing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the in-situ synchronous remediation system for soil and groundwater provided in Example 1;

[0022] Figure 2 This is a schematic diagram of the branch piping distribution of the rinsing assembly provided in Example 1.

[0023] Icons: 10-Repair Well; 11-First Cavity; 111-First Permeable Section; 12-Second Cavity; 121-Second Permeable Section; 13-Third Cavity; 131-Third Permeable Section; 14-Fourth Cavity; 141-Fourth Permeable Section; 15-First Barrier; 16-Second Barrier; 17-Third Barrier; 20-Water Pumping / Injection Assembly; 21-First Connecting Assembly; 211-First Pipeline; 212-First Valve; 213-First Pump Body; 22-Second Connecting Assembly; 221-Second Pipeline; 222-Second Valve; 223-Second Pump Body; 23-Third Connecting Assembly; 231-Third Pipeline; 232-Third Valve; 233-Third Pump Body; 24-Fourth Connecting Assembly; 241-Fourth Pipeline ; 242-Fourth valve; 243-Fourth pump body; 30-Active reaction component; 31-Active reaction tank; 32-Liquid level monitoring component; 33-Contaminant concentration monitoring component; 40-Scrubbing component; 41-Main pipeline component; 411-Fifth pipeline; 412-Fifth valve; 413-Fifth pump body; 42-Branch pipeline; 43-Flow control component; 44-Spray head; 45-Flow monitoring component; 50-Control component; 60-Gas supply component; 61-Gas pipeline; 62-First gas valve; 63-Second gas valve; 64-Third gas valve; 65-Gas pressure monitoring component; 70-First water level monitoring component; 80-Second water level monitoring component; 2-Lower aquifer; 3-Upper aquifer; 4-Soil layer; 5-Imperitive layer. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a soil and groundwater in-situ synchronous remediation system and method to solve the problems existing in the prior art, realize in-situ synchronous remediation of soil and groundwater, and improve remediation efficiency.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] This embodiment provides a system for simultaneous in-situ remediation of soil and groundwater. Please refer to [link / reference]. Figure 1 The system includes a remediation well 10, a water injection / extraction assembly 20, an active reaction assembly 30, a leaching assembly 40, and a control assembly 50. The remediation well 10 is installed within the soil, with its bottom sealed and positioned within the lower aquifer 2. The remediation well 10 has four chambers arranged from top to bottom: a first chamber 11, a second chamber 12, a third chamber 13, and a fourth chamber 14. The first and second chambers 11 and 12 are connected to the upper aquifer 3, and the third and fourth chambers 13 and 14 are connected to the lower aquifer 2. The water injection / extraction assembly 20 is connected to all four chambers. The active reaction assembly 30 is connected to the water injection / extraction assembly 20 and contains a remediation agent. The water injection component 20 can extract groundwater from the first cavity 11 or the fourth cavity 14 to the active reaction component 30 and mix it with the remediation agent. The water injection component 20 can also inject the groundwater mixed and reacted in the active reaction component 30 into the second cavity 12 or the third cavity 13. The rinsing component 40 is connected to the active reaction component 30. The rinsing component 40 is arranged around the remediation well 10 and can be buried in the soil layer 4. The rinsing component 40 is used to extract the groundwater mixed and reacted in the active reaction component 30 and rinsing the soil. The control component 50 is communicatively connected to the water injection component 20, the active reaction component 30 and the rinsing component 40, and is used to control the operation of the water injection component 20, the active reaction component 30 and the rinsing component 40.

[0029] The first cavity 11 and the second cavity 12 can be used for pumping water and injecting water to achieve hydraulic circulation, respectively. The third cavity 13 and the fourth cavity 14 can be used for injecting water and pumping water to achieve hydraulic circulation, respectively. Similarly, the first cavity 11 and the second cavity 12 can be used for injecting water and pumping water to achieve hydraulic circulation, respectively. The third cavity 13 and the fourth cavity 14 can be used for pumping water and injecting water to achieve hydraulic circulation. This embodiment is described with the first cavity 11 and the second cavity 12 used for pumping water and injecting water, respectively, and the third cavity 13 and the fourth cavity 14 used for injecting water and pumping water, respectively.

[0030] By setting up a remediation well 10, which has a first cavity 11 and a second cavity 12 communicating with the upper aquifer 3, and a third cavity 13 and a fourth cavity 14 communicating with the lower aquifer 2, groundwater flow is facilitated. During the remediation process, under the control of the control component 50, the pumping and injection component 20 can pump groundwater through the first cavity 11 or the fourth cavity 14 and introduce it into the active reaction component 30 to mix with the remediation agent for treatment, thus achieving extraction-treatment. At the same time, the groundwater mixed with the remediation agent... Water can also be leached into the soil layer 4 by the leaching component 40. Since the leaching fluid is groundwater mixed with remediation agents, it can remediate the soil, achieving in-situ soil leaching remediation. The leaching fluid can flow to the upper aquifer 3 under the action of gravity, and the water pumping component 20 can pump water from the first cavity 11 to promote the vertical migration of the leaching fluid, thereby shortening the remediation cycle. In addition, after the water pumping component 20 pumps out groundwater and mixes it with the remediation agents for treatment, it can also be mixed with the remediation agents in the active reaction component 30. The mixed groundwater is directly injected into the second cavity 12 or the third cavity 13. Groundwater hydraulic circulation is achieved through water injection and extraction control in different cavities, thereby remediating groundwater pollution in the lower aquifer 2 or the upper aquifer 3. In other words, this invention constructs an integrated soil and water remediation system by coupling in-situ soil washing technology and groundwater extraction-treatment technology, realizing simultaneous in-situ remediation of soil and groundwater pollution. The combination of in-situ soil washing and hydraulic circulation control fully leverages the advantages of each technology, mitigating their weaknesses and avoiding the risk of groundwater pollution that can easily result from in-situ soil washing. Vertically-oriented hydraulic circulation control improves pollutant removal efficiency, mitigates the tailing-rebound side effects during aquifer remediation, and significantly enhances mass transfer of remediation agents in the aquifer, shortening the remediation cycle and achieving efficient in-situ remediation of soil and water pollution. The integrated in-situ soil washing and groundwater circulation treatment remediation technology system allows for the replacement of remediation agents according to the type of target pollutant and remediation requirements, offering high flexibility in technology combination.

[0031] In a preferred embodiment, the repair well 10 is provided with a first barrier 15, a second barrier 16, and a third barrier 17 arranged sequentially from top to bottom. The first barrier 15 is flush with the middle of the upper aquifer 3, the second barrier 16 is flush with the upper part of the impermeable layer 5, and the third barrier 17 is flush with the middle of the lower aquifer 2, facilitating the circulation of groundwater. The outer walls of the first barrier 15, the second barrier 16, and the third barrier 17 can be sealed to the inner wall of the repair well 10 to form a first cavity 11, a second cavity 12, a third cavity 13, and a fourth cavity 14. Furthermore, the first barrier 15, the second barrier 16, and the third barrier 17 are all connected to the control component 50. The control component 50 is used to individually control the deformation of the first barrier 15, the second barrier 16, and the third barrier 17 to seal or detach from the inner wall of the repair well 10. By setting the deformable first barrier 15, the second barrier 16, and the third barrier 17, it is easy to adjust the connectivity between the first cavity 11, the second cavity 12, the third cavity 13, and the fourth cavity 14. When it is necessary to replenish the groundwater mixed with the repair agent in the upper aquifer 3 into the third cavity 13 to mix with the groundwater in the lower aquifer 2, the first barrier 15 and the second barrier 16 can be controlled to detach from the inner wall of the repair well 10, so that the groundwater in the upper aquifer 3 can automatically flow into the lower aquifer 2 under the action of gravity, which is easy to control.

[0032] In a preferred embodiment, the soil and groundwater in-situ synchronous remediation system provided in this embodiment further includes a gas supply component 60. The first barrier 15, the second barrier 16, and the third barrier 17 are all conventional gas barrier devices capable of being filled and released to achieve volume changes. The gas supply component 60 includes a gas pipeline 61, one end of which is connected to an external gas source, and the other end extends into the remediation well 10 and is connected to the first barrier 15, the second barrier 16, and the third barrier 17. The gas pipeline 61 is also equipped with a communication device with the control component 50. The first air valve 62, the second air valve 63, and the third air valve 64 are connected. The first air valve 62, the second air valve 63, and the third air valve 64 are used to control the opening and closing of the first isolator 15, the second isolator 16, and the third isolator 17 with the gas pipeline 61. The gas pipeline 61 is equipped with a gas pressure monitoring component 65 that is communicatively connected to the control component 50. By controlling the opening and closing of the first air valve 62, the second air valve 63, and the third air valve 64, the gas pipeline 61 is used to charge or release gas to the first isolator 15, the second isolator 16, and the third isolator 17, which facilitates control.

[0033] Specifically, the air pressure monitoring component 65 is configured as an air pressure sensor.

[0034] In the optional scheme of this embodiment, more preferably, the inner walls of the first cavity 11, the second cavity 12, the third cavity 13 and the fourth cavity 14 are respectively provided with a first permeable section 111, a second permeable section 121, a third permeable section 131 and a fourth permeable section 141, so that the first cavity 11 and the second cavity 12 can be connected to the upper aquifer 3, and the third cavity 13 and the fourth cavity 14 can be connected to the lower aquifer 2.

[0035] Specifically, the first permeable section 111, the second permeable section 121, the third permeable section 131, and the fourth permeable section 141 are all configured with multiple sieve holes. The top of the first permeable section 111 should be 0.5-1m lower than the stable water level of the upper aquifer 3. The lengths of the first permeable section 111 and the second permeable section 121 in the axial direction of the repair well 10 are consistent. The ratio of the sum of the lengths of the first permeable section 111 and the second permeable section 121 to the length of the interval between the first permeable section 111 and the second permeable section 121 is 1 / 3-2 / 3. Correspondingly, the third permeable section 131 and the fourth permeable section 141 are configured in the same way. The top of the third permeable section 131 should be 0.5-1m lower than the stable water level of the lower aquifer 2 to ensure the stability of hydraulic circulation.

[0036] In an optional embodiment, more preferably, the water injection / extraction assembly 20 includes a first connecting assembly 21, a second connecting assembly 22, a third connecting assembly 23, and a fourth connecting assembly 24, all of which are communicatively connected to the control assembly 50. The first connecting assembly 21 is connected at both ends to the first cavity 11 and the active reaction assembly 30, the second connecting assembly 22 is connected at both ends to the second cavity 12 and the active reaction assembly 30, the third connecting assembly 23 is connected at both ends to the third cavity 13 and the active reaction assembly 30, and the fourth connecting assembly 24 is connected at both ends to the fourth cavity 14 and the active reaction assembly 30. The control assembly 50 is used to control the operation of the first connecting assembly 21, the second connecting assembly 22, the third connecting assembly 23, and the fourth connecting assembly 24 to enable groundwater flow between the active reaction assembly 30 and the first cavity 11, the second cavity 12, the third cavity 13, or the fourth cavity 14.

[0037] Specifically, the first connecting component 21 includes a first pipeline 211 and a first valve 212 and a first pump body 213 disposed on the first pipeline 211 and communicatively connected to the control component 50; the second connecting component 22 includes a second pipeline 221 and a second valve 222 and a second pump body 223 disposed on the second pipeline 221 and communicatively connected to the control component 50; the third connecting component 23 includes a third pipeline 231 and a third valve 232 and a third pump body 233 disposed on the third pipeline 231 and communicatively connected to the control component 50; and the fourth connecting component 24 includes a fourth pipeline 241 and a fourth valve 242 and a fourth pump body 243 disposed on the fourth pipeline 241 and communicatively connected to the control component 50. The control component 50 controls the corresponding valves and pumps to achieve water pumping or water injection. Specifically, the first connecting component 21 and the fourth connecting component 24 are set for water pumping. Correspondingly, the first pump body 213 and the fourth pump body 243 are set as submersible pumps for water pumping. The first pipeline 211 and the fourth pipeline 241 can both be connected to a water pumping pipe connected to the active reaction component 30 to achieve water pumping. The lower end is 0.5-1.0m away from the bottom of the corresponding cavity. The second connecting component 22 and the third connecting component 23 are set for water injection. Correspondingly, the second pump body 223 and the third pump body 233 are set as pneumatic diaphragm pumps for water injection. The second pipeline 221 and the third pipeline 231 can both be connected to a water injection pipe connected to the active reaction component 30 to achieve water injection.

[0038] In the optional embodiments of this example, more preferably, the active reaction component 30 includes an active reaction tank 31, a liquid level monitoring component 32, and a pollutant concentration monitoring component 33. The active reaction tank 31 contains a remediation agent and is connected to the water injection component 20 and the rinsing component 40. The liquid level monitoring component 32 is communicatively connected to the control component 50 and is used to monitor the liquid level information of the active reaction tank 31 for timely adjustment. The pollutant concentration monitoring component 33 is communicatively connected to the control component 50 and is used to monitor the pollutant concentration information of the mixed groundwater in the active reaction tank 31 for easy assessment of the degree of remediation.

[0039] Specifically, both the liquid level monitoring component 32 and the pollutant concentration monitoring component 33 are configured as sensors for monitoring.

[0040] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 1 and Figure 2The rinsing assembly 40 includes a main pipeline assembly 41 and multiple circumferentially distributed branch pipelines 42. One end of the main pipeline assembly 41 is connected to the active reaction assembly 30, and the other end is connected to multiple branch pipelines 42. The main pipeline assembly 41 is equipped with a flow monitoring component 45 that is communicatively connected to the control component 50 to facilitate monitoring the water flow rate of the main pipeline assembly 41. Each branch pipeline 42 is equipped with a flow control component 43 that is communicatively connected to the control component 50. The portion of each branch pipeline 42 that is buried in the soil layer 4 is equipped with multiple spray heads 44 along its length. The branch pipelines 42 are buried at a depth of less than 0.5m below the ground. The multiple branch pipelines 42 and spray heads 44 improve the remediation efficiency. The flow control component 43 facilitates monitoring and regulating the spray flow rate. The main pipeline assembly 41 is communicatively connected to the control component 50, which is used to control the operation of the main pipeline assembly 41 to control the connection and disconnection between each branch pipeline 42 and the active reaction assembly 30.

[0041] Specifically, the main pipeline assembly 41 includes a fifth pipeline 411, a fifth valve 412 and a fifth pump body 413 disposed on the fifth pipeline 411 and communicatively connected to the control assembly 50, to facilitate control of the rinsing action. The fifth pipeline 411 can also be connected to the water injection pipe. A flow monitoring component 45 is disposed on the fifth pipeline 411. The flow monitoring component 45 is a flow meter, the flow control component 43 is a solenoid valve, and the fifth pump body 413 is a pneumatic diaphragm pump.

[0042] In the optional scheme of this embodiment, more preferably, the soil and groundwater in-situ synchronous remediation system provided in this embodiment further includes a first water level monitoring component 70 and a second water level monitoring component 80 respectively disposed at the bottom of the first cavity 11 and the third cavity 13. The first water level monitoring component 70 and the second water level monitoring component 80 are both communicatively connected to the control component 50 and are used to monitor the water level information in the first cavity 11 and the third cavity 13. By monitoring the information in the first cavity 11 and the third cavity 13, the water level of the upper aquifer 3 and the lower aquifer 2 can be determined in a timely manner. Specifically, the first water level monitoring component 70 and the second water level monitoring component 80 are both configured as liquid level sensors.

[0043] Example 2

[0044] This embodiment also provides a method for in-situ remediation of soil and groundwater, including the following steps:

[0045] Under the control of the control component 50, the water injection component 20 extracts groundwater from the lower aquifer 2 and mixes it with the remediation agent in the active reaction component 30. The leaching component 40 leaches the soil with the groundwater mixed and reacted in the active reaction component 30. When the leaching liquid flows into the upper aquifer 3, the water injection component 20 extracts groundwater from the upper aquifer 3 and mixes it with the active reaction component 30. At the same time, the water injection component 20 extracts the groundwater mixed and reacted in the active reaction component 30 and injects it into the upper aquifer 3, forming a hydraulic cycle between soil leaching and the upper aquifer 3. Under the control of the control component 50, the groundwater mixed with the remediation agent is added to the lower aquifer 2 for mixing.

[0046] Specifically, the following description is based on the scenario where the first chamber 11 and the second chamber 12 are used for pumping and injection, respectively, and the third chamber 13 and the fourth chamber 14 are used for injection and pumping, respectively. The second air valve 63 and the third air valve 64 are opened to inject high-pressure gas into the second barrier 16 and the third barrier 17, causing them to expand and isolate the upper aquifer 3 and the lower aquifer 2. The inflation pressure is calculated based on the depth of the aquifer. The second air valve 63 and the third air valve 64 are closed. The fourth pump body 243 and the fourth valve 242 are opened, while other pump bodies and valves remain closed. Pumping is started, and the pumping flow rate is determined based on the actual site conditions. The contaminated groundwater in the lower aquifer 2 is pumped to the activated reaction tank 31 for treatment by the extraction action of the fourth pump body 243. The fifth pump body 413 and... The fifth valve 412 injects the treated groundwater into the fifth pipeline 411, which is then evenly distributed to each branch pipeline 42. The treated groundwater flows into the soil layer 4 under gravity, leaching contaminants from the soil layer 4. The leaching intensity should be set and adjusted according to the soil lithology and pumping flow rate. The leaching solution carrying contaminants and remediation reagents enters the upper aquifer 3. The first gas valve 62 is opened, and high-pressure gas is injected into the first barrier 15 through the control component 50 to expand it, isolating the first cavity 11 and the second cavity 12. The first gas valve 62 is closed, and the first pump body 213, the second pump body 223, the first valve 212, and the second valve 222 are opened, initiating the water circulation in the upper aquifer 3. The first pump body 213 extracts water from the first cavity 11... Groundwater extraction lowers the groundwater level. Under the influence of the pressure difference, the leachate and groundwater outside the upper aquifer 3 flow into the first cavity 11 through the first permeable section 111. The first pump 213 creates a vacuum at the first cavity 11, promoting the vertical migration of the leachate in the soil. The second pump 223 then injects the extracted leachate and groundwater from the first contaminated aquifer, after mixing and treatment in the active reaction tank 31, into the second cavity 12, raising the water head at that location. The groundwater then flows out through the second permeable section 121, replenishing the upper aquifer 3. This forms a hydraulic circulation pattern of soil leaching, pumping from the first cavity 11, and injection into the second cavity 12. This hydraulic circulation promotes mass transfer of the remediation reagent in the upper aquifer 3, increasing... The system enhances the removal of pollutants from the first contaminated aquifer, shortening the remediation cycle. During the hydraulic circulation process, the control component 50 monitors the groundwater level of the lower aquifer 2 in real time via the second water level monitoring component 80. When the water level drops to the position of the third barrier 17, the fourth pump body 243 and the fourth valve 242 are closed, stopping the extraction of groundwater from the lower aquifer 2. The control component 50 controls the flow rates of the first pump body 213, the fifth pump body 413, and the second pump body 223 to generate a stable hydraulic circulation within the upper aquifer 3. The control component 50 obtains the pollutant concentration monitoring component 33 to monitor the pollutant concentration in the mixture of leaching solution and groundwater in the active reaction tank 31 in real time. When the pollutant concentration reaches the set standard, it is considered that the pollutants in the upper aquifer 3 have been treated.Close the first pump body 213, the fifth pump body 413, the second pump body 223, the first valve 212, the fifth valve 412, and the second valve 222 to stop soil leaching and hydraulic circulation in the upper aquifer 3.

[0047] During the remediation of the lower aquifer 2, the first gas valve 62 and the second gas valve 63 are opened. The high-pressure gas in the first barrier 15 and the second barrier 16 is released by the control component 50, reducing their volume and thus connecting the upper aquifer 3 and the lower aquifer 2. The first gas valve 62 and the second gas valve 63 are then closed. Under the action of gravity, the groundwater in the upper aquifer 3 flows into the lower aquifer 2, causing the groundwater level in the upper aquifer 3 to drop and the water level in the lower aquifer 2 to rise. At the same time, the remaining remediation reagent in the groundwater of the upper aquifer 3 is replenished to the lower aquifer 2 along with the groundwater in the upper aquifer 3, assisting in the removal of pollutants in the lower aquifer 2.

[0048] In addition, this embodiment can also utilize the pumping and injection assembly 20 to form a hydraulic circulation in the lower aquifer 2 to remove pollutants from the lower aquifer 2: The fourth pump body 243, the third pump body 233, the fourth valve 242, and the third valve 232 are opened. Through the action of the third pump body 233, the mixture of soil leaching solution from the active reaction tank 31 and groundwater from the upper aquifer 3 is injected into the lower aquifer 2. The pumping and injection circulation formed by the fourth pump body 243 and the third pump body 233 in the lower aquifer 2 further enhances the effect of the pollution remediation agent in the lower aquifer. Mass transfer in layer 2; due to the extraction of groundwater from the lower aquifer 2 for leaching during the remediation stage of the upper aquifer 3, the groundwater level in the lower aquifer 2 drops. The first pump body 213 and the first valve 212 are opened to extract groundwater from the upper aquifer 3 to replenish the lower aquifer 2. The water level of the lower aquifer 2 is obtained in real time by the control component 50 and the second water level monitoring component 80. When the water level rises to the initial water level height, it is considered that one cycle of remediation is completed. This cycle of remediation is repeated until the concentration of pollutants in the soil and groundwater reaches the standard.

[0049] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A soil and groundwater in-situ synchronous remediation system, characterized in that: include: Repair well (10) is set in the soil. The bottom of the repair well (10) is closed and placed in the lower aquifer (2). The repair well (10) is provided with a first cavity (11), a second cavity (12), a third cavity (13) and a fourth cavity (14) arranged from top to bottom. The first cavity (11) and the second cavity (12) are connected to the upper aquifer (3). The third cavity (13) and the fourth cavity (14) are connected to the lower aquifer (2). The water pumping and injection assembly (20) is connected to the first cavity (11), the second cavity (12), the third cavity (13), and the fourth cavity (14); the first cavity (11) is used for pumping or injecting water, and correspondingly, the second cavity (12) is used for injecting or pumping water; the third cavity (13) is used for pumping or injecting water, and correspondingly, the fourth cavity (14) is used for injecting or pumping water. The active reaction component (30) is connected to the pumping and injection component (20), and the active reaction component (30) contains a remediation agent. The pumping and injection component (20) can pump groundwater from the upper aquifer (3) or the lower aquifer (2) to the active reaction component (30) and mix it with the remediation agent. The pumping and injection component (20) can also reinject the groundwater mixed and reacted in the active reaction component (30) back into the upper aquifer (3) or the lower aquifer (2). A leaching assembly (40) is connected to the active reaction assembly (30). The leaching assembly (40) is arranged around the remediation well (10) and can be buried in the soil layer (4). The leaching assembly (40) is used to extract the groundwater mixed and reacted in the active reaction assembly (30) and leach the soil. The control component (50) is communicatively connected to the water injection component (20), the active reaction component (30), and the leaching component (40). Under the control of the control component (50), the water injection component (20) draws groundwater from the lower aquifer (2) into the active reaction component (30) to mix and react with the remediation agent. The leaching component (40) uses the groundwater mixed and reacted in the active reaction component (30) to leach the soil. After the leaching liquid flows to the upper aquifer (2), the soil is leached. Within the aquifer (3), the pumping and injection assembly (20) extracts groundwater from the upper aquifer (3) into the active reaction assembly (30), while the pumping and injection assembly (20) also extracts groundwater from the active reaction assembly (30) after mixing and reaction and reinjects it into the upper aquifer (3), forming a hydraulic cycle in the upper aquifer (3). Under the control of the control assembly (50), groundwater mixed with the remediation agent can also be added to the lower aquifer (2) for mixing.

2. The soil and groundwater in-situ synchronous remediation system according to claim 1, characterized in that: The repair well (10) is provided with a first barrier (15), a second barrier (16), and a third barrier (17) arranged sequentially from top to bottom. The first barrier (15) is located at the middle height of the upper aquifer (3), the second barrier (16) is flush with the upper part of the water-resistant layer (5), and the third barrier (17) is located at the middle height of the lower aquifer (2). The outer peripheral walls of the first barrier (15), the second barrier (16), and the third barrier (17) can be sealed and fitted to the repair well. The inner wall of the well (10) forms the first cavity (11), the second cavity (12), the third cavity (13), and the fourth cavity (14); and the first barrier (15), the second barrier (16), and the third barrier (17) are all connected to the control assembly (50), which is used to individually control the deformation of the first barrier (15), the second barrier (16), and the third barrier (17) to seal or detach from the inner wall of the repair well (10).

3. The soil and groundwater in-situ synchronous remediation system according to claim 2, characterized in that: It also includes a gas supply assembly (60), wherein the first barrier (15), the second barrier (16), and the third barrier (17) are all configured as gas barriers; the gas supply assembly (60) includes a gas pipeline (61), one end of which is connected to an external gas source, and the other end extends into the repair well (10) and is connected to the first barrier (15), the second barrier (16), and the third barrier (17), and the gas pipeline (61) is provided with a first gas valve (62) and a second gas valve that are communicatively connected to the control assembly (50). (63) and the third gas valve (64), the first gas valve (62), the second gas valve (63) and the third gas valve (64) are respectively used to control the opening and closing of the first barrier (15), the second barrier (16) and the third barrier (17) with the gas pipeline (61); the gas pipeline (61) is provided with a gas pressure monitoring component (65) that is communicatively connected to the control component (50), and the gas pipeline (61) is used to charge or release gas to the first barrier (15), the second barrier (16) and the third barrier (17).

4. The soil and groundwater in-situ synchronous remediation system according to claim 2, characterized in that: The inner walls of the first cavity (11), the second cavity (12), the third cavity (13), and the fourth cavity (14) are respectively provided with a first permeable section (111), a second permeable section (121), a third permeable section (131), and a fourth permeable section (141), so that the first cavity (11) and the second cavity (12) can be connected to the upper aquifer (3), and the third cavity (13) and the fourth cavity (14) can be connected to the lower aquifer (2).

5. The soil and groundwater in-situ synchronous remediation system according to claim 4, characterized in that: The upper part of the first permeable section (111) is lower than the water level of the upper aquifer (3), and the first permeable section (111) and the second permeable section (121) are symmetrical about the first barrier (15) in the axial direction of the repair well (10); the upper part of the third permeable section (131) is lower than the water level of the lower aquifer (2), and the third permeable section (131) and the fourth permeable section (141) are symmetrical about the third barrier (17) in the axial direction of the repair well (10).

6. The soil and groundwater in-situ synchronous remediation system according to claim 1, characterized in that: The water injection assembly (20) includes a first connecting component (21), a second connecting component (22), a third connecting component (23), and a fourth connecting component (24), all of which are communicatively connected to the control assembly (50). The first connecting component (21) is connected at both ends to the first cavity (11) and the active reaction assembly (30), respectively. The second connecting component (22) is connected at both ends to the second cavity (12) and the active reaction assembly (30), respectively. The third connecting component (23) is connected at both ends to the third cavity (13) and the active reaction assembly (30), respectively. The active reaction component (30) is described above, and the two ends of the fourth connecting component (24) are respectively connected to the fourth cavity (14) and the active reaction component (30); the control component (50) is used to control the operation of the first connecting component (21), the second connecting component (22), the third connecting component (23) and the fourth connecting component (24) so ​​that groundwater can flow between the active reaction component (30) and the first cavity (11), the second cavity (12), the third cavity (13) or the fourth cavity (14).

7. The soil and groundwater in-situ synchronous remediation system according to claim 1, characterized in that: The active reaction component (30) includes an active reaction tank (31), a liquid level monitoring component (32), and a pollutant concentration monitoring component (33). The active reaction tank (31) contains the remediation agent. The active reaction tank (31) is connected to the water injection component (20) and the rinsing component (40). The liquid level monitoring component (32) is communicatively connected to the control component (50) and is used to monitor the liquid level information of the active reaction tank (31). The pollutant concentration monitoring component (33) is communicatively connected to the control component (50) and is used to monitor the pollutant concentration information in the active reaction tank (31).

8. The soil and groundwater in-situ synchronous remediation system according to claim 1, characterized in that: The rinsing assembly (40) includes a main pipeline assembly (41) and multiple branch pipelines (42) distributed circumferentially. One end of the main pipeline assembly (41) is connected to the active reaction assembly (30), and the other end is connected to multiple branch pipelines (42). The main pipeline assembly (41) is provided with a flow monitoring component (45) that is communicatively connected to the control component (50). Each branch pipeline (42) is provided with a flow control component (43) that is communicatively connected to the control component (50), and multiple spray heads (44) are provided along the length of the portion of each branch pipeline (42) buried in the soil layer (4). The main pipeline assembly (41) is communicatively connected to the control component (50), and the control component (50) is used to control the operation of the main pipeline assembly (41) to control the connection and disconnection between each branch pipeline (42) and the active reaction assembly (30).

9. The soil and groundwater in-situ synchronous remediation system according to claim 1, characterized in that: It also includes a first water level monitoring component (70) and a second water level monitoring component (80) respectively disposed at the bottom of the first cavity (11) and the third cavity (13). The first water level monitoring component (70) and the second water level monitoring component (80) are both communicatively connected to the control component (50) and are used to monitor the water level information in the first cavity (11) and the third cavity (13).

10. A remediation method based on the soil and groundwater in-situ synchronous remediation system as described in any one of claims 1-9, characterized in that: Includes the following steps: Under the control of the control component (50), the pumping and injection component (20) pumps groundwater from the lower aquifer (2) into the active reaction component (30) to mix and react with the remediation agent. The rinsing component (40) rinses the soil with the groundwater after the reaction in the active reaction component (30). When the rinsing liquid flows into the upper aquifer (3), the pumping and injection component (20) pumps groundwater from the upper aquifer (3) into the active reaction component (30). At the same time, the pumping and injection component (20) pumps groundwater after the reaction in the active reaction component (30) and reinjects it into the upper aquifer (3), forming a hydraulic cycle in the upper aquifer (3). Under the control of the control component (50), groundwater mixed with the remediation agent is added to the lower aquifer (2) for mixing.

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