A soil and groundwater remediation system and method

Abstract

The present application relates to a kind of soil and groundwater remediation system and method, system includes remediation medium conveying device, remediation medium injection device and groundwater extraction dynamic sensing device;Remediation medium conveying device includes medicament delivery unit and compressed air delivery unit;Remediation medium injection device includes pressure hose, porous pipe and propelling injector, pressure hose one end is connected medicament delivery unit and compressed air delivery unit, the other end is connected propelling injector, porous pipe is inserted into the contaminated underground soil layer area to be repaired, propelling injector is arranged in porous pipe;Groundwater extraction dynamic sensing device includes groundwater extraction well, dry contact liquid level meter and integrated online detection control cabinet.Compared with prior art, the present application realizes soil groundwater in-situ medicament injection repair, aeration repair and other multi-method switching, can dynamically perceive groundwater quality and hydrogeological condition, realizes the balanced circulation repair of soil and groundwater.

Description

Technical Field

[0001] This invention relates to the field of groundwater remediation technology, specifically to a soil and groundwater remediation system and method. Background Technology

[0002] Continuous dynamic remediation technology for soil and groundwater is a soil and groundwater remediation technology, but there are currently few related application cases in China. Domestic soil and groundwater remediation equipment systems are generally outdated, with low levels of automation, requiring manual operation by on-site technicians. Existing processes have significant loopholes in safety and reliability, with serious equipment leaks and spills, and lack the technical means for automatic on-site detection and operation. At present, there are few complete automated sets of equipment that integrate dynamic monitoring, remediation treatment, and multi-media high-pressure injection processes.

[0003] Currently, the commonly used methods for soil and groundwater remediation are ex-situ remediation and in-situ remediation. Ex-situ remediation mainly involves the removal of contaminated soil and the extraction of contaminated groundwater for remediation. In-situ remediation methods include microbial remediation, groundwater aeration remediation, chemical redox remediation, extraction remediation, and thermal treatment remediation. Current remediation processes and equipment can only support one of these methods, resulting in poor process adjustability and an inability to achieve efficient and low-cost adjustments to the remediation approach.

[0004] At present, domestic in-situ groundwater and soil remediation agents mainly rely on vertical injection well technology. The diffusion effect of the remediation agents in contaminated soil and groundwater is unstable and greatly affected by hydrogeological conditions. If the agents are not diffused in time, they are prone to solidification in soil crevices.

[0005] Traditional injection remediation schemes employ vertical wells, which have the following disadvantages: 1. They require the deployment of numerous vertical wells, resulting in high investment and severe environmental damage; 2. The diffusion effect of the reagents is uncontrollable, passively relying on the slow hydraulic gradient diffusion within the soil, leading to significant uncertainty in the process; 3. Because the diffusion of the medium heavily depends on the hydrogeological conditions of the contaminated soil layer, the project remediation cycle is long and the remediation effect is unstable; 4. Due to the complex composition of the soil, many uncontrollable changes occur, leading to changes in hydrogeological conditions. At this point, the original remediation scheme reaches its remediation limit and can no longer function. In such cases, adjusting or replacing traditional processes is difficult and costly; 5. Traditional remediation processes require the deployment of numerous monitoring wells, resulting in low monitoring frequency and high costs. Referring to HJ25.6-2019 groundwater remediation testing, the method of monthly manual sampling and laboratory testing is time-consuming and labor-intensive, and the low-frequency sampling and testing cannot achieve dynamic monitoring and real-time understanding of the changing trends of groundwater quality and hydraulic gradient. Summary of the Invention

[0006] The purpose of this invention is to provide a soil and groundwater remediation system and method that enables switching between multiple methods such as in-situ agent injection remediation and aeration remediation of soil and groundwater, and can dynamically sense groundwater quality.

[0007] The objective of this invention can be achieved through the following technical solution: a soil and groundwater remediation system, comprising a remediation medium delivery device, a remediation medium injection device, and a groundwater extraction dynamic sensing device;

[0008] The repair medium delivery device includes a reagent delivery unit and a compressed air delivery unit;

[0009] The remediation medium injection device includes a pressure-bearing hose, a porous jacking pipe, and a propulsion injector. One end of the pressure-bearing hose is connected to the agent delivery unit and the compressed air delivery unit, and the other end is connected to the propulsion injector. The porous jacking pipe is pushed into the contaminated underground soil layer area to be remediated, and the propulsion injector is installed inside the porous jacking pipe.

[0010] The aforementioned groundwater extraction dynamic sensing device includes a groundwater extraction well, a dry contact level gauge for sensing the groundwater level, and an integrated online detection and control cabinet for monitoring groundwater indicators. The groundwater extraction well is located in the area of ​​the contaminated underground soil layer to be remediated. The dry contact level gauge is installed inside the well, and the integrated online detection and control cabinet is installed outside the well.

[0011] Preferably, the drug delivery unit includes a water tank, a drug tank, a drug storage box, a low-pressure pump, a high-pressure pump, and an electromagnetic flow meter;

[0012] The input end of the temporary storage tank is connected to a water tank and a medicine tank, and the output end is connected to a repair medium injection device after passing through a low-pressure pump, an electromagnetic flow meter and a high-pressure pump in sequence.

[0013] More preferably, the output end of the reagent storage tank is connected to a repair medium injection device via a low-pressure pump, an electromagnetic flow meter, a plate heat exchanger, a security filter, a high-pressure pump, and an electric valve in sequence.

[0014] More preferably, the agent delivery unit further includes a recycled water tank and an agent delivery pump. The recycled water tank, clean water tank, and agent tank are connected to the input end of the agent temporary storage tank via the agent delivery pump. The recycled water tank is connected to a groundwater extraction well or a groundwater treatment device.

[0015] Preferably, the groundwater treatment device includes a groundwater buffer tank, a reaction tank, an inclined plate sedimentation tank, an air flotation tank, and a clear water buffer tank arranged in sequence. The groundwater buffer tank is connected to a groundwater extraction well, and the clear water buffer tank is connected to a recycled water tank.

[0016] More preferably, the drug delivery pump is a drug delivery metering pump.

[0017] Preferably, the compressed air delivery unit includes an air compressor, a compressed air cylinder, and an electric valve. The air compressor compresses the air, which then passes through the compressed air cylinder and the electric valve before being connected to the repair medium injection device.

[0018] Preferably, the repair medium delivery device further includes a control unit, which uses a PLC module to control the agent delivery unit and the compressed air delivery unit.

[0019] Preferably, the repair medium injection device further includes an automatic hose winch and a hose protection elbow;

[0020] During the forward movement of the injector, the automatic hose winch releases the pressure hose in coordination with its propulsion action. After the injection is completed, the automatic hose winch retracts the hose and drives the injector back to its original position.

[0021] The hose protection elbow is located at the boundary between the remediation agent injection well and the contaminated underground soil layer to be remediated, and the pressure-bearing hose passes through the hose protection elbow and extends into the porous jacking pipe.

[0022] More preferably, the remediation agent injection well is vertically located on the ground surface, penetrating deep into the contaminated underground soil layer.

[0023] Preferably, the propulsion injector is a reaction force spin propulsion injector.

[0024] More preferably, the propulsion injector includes an integral support and a multi-link support component, a power propulsion component, and a reaction force spin injection component disposed on the integral support.

[0025] This invention uses a reaction force self-propelled injection head. The front nozzle rotates 360° through the reaction force to inject compressed air or agents. Compared with the traditional injection well process, this method has concentrated injection pressure and does not produce pressure decay.

[0026] Preferably, the groundwater extraction dynamic sensing device further includes a submersible pump, a groundwater extraction platform, an electric hoist, and a disc filter.

[0027] The groundwater extraction platform is set above the groundwater extraction well. An electric hoist is installed on the support above the platform. The electric hoist lifts and controls the submersible pump to the height required by the repair plan. The groundwater is transported to the disc filter through the submersible pump, and the filtered groundwater enters the integrated online detection and control cabinet.

[0028] Preferably, the integrated online detection and control cabinet is equipped with an online pH monitoring probe, an online conductivity monitoring probe, an online redox potential monitoring probe, and an online TOC monitoring probe;

[0029] The integrated online detection and control cabinet is also equipped with a PLC module and a communication TPU module.

[0030] A method for soil and groundwater remediation, using the above-mentioned system, involves injecting compressed air into the contaminated underground soil layer area to be remediated through a compressed air delivery unit and a remediation medium injection device; injecting clean water into the contaminated underground soil layer area to be remediated through a chemical delivery unit and a remediation medium injection device; and injecting chemicals into the contaminated underground soil layer area to be remediated through a chemical delivery unit and a remediation medium injection device.

[0031] The soil and groundwater remediation method described in this invention can select corresponding steps and adjust processes based on the hydrogeological conditions of underground soil, the characteristics of groundwater pollution, and the determined remediation and risk management model, taking into account the characteristics of the applicable target pollutants, environmental risks, efficiency, and costs.

[0032] Preferably, the pressure range of the injected medium is determined according to the repair plan, and the pressure range is 0-20 MPa. The injection volume per injection is calculated within its effective range according to the properties of the soil layer using the following formula:

[0033] Q = Vnd N1 α and Q represent the cumulative amount of medium used in a single application, V represents the effective range of medium injection, n represents the average porosity of the contaminated soil layer, and d represents the average porosity of the soil layer. N1 The relative density of the injected medium is represented by α, and the coefficient by which the injected medium fills the voids is represented by α.

[0034] More preferably, the concentration of the reagent is determined according to the repair plan, and to ensure stable operation of the equipment, the content of undissolved suspended particulate matter in the reagent shall not exceed 1%.

[0035] Preferably, the soil and groundwater remediation method includes the following steps:

[0036] S1: High-pressure air is injected into the contaminated underground soil layer area to be remediated through the air delivery unit and the remediation medium injection device;

[0037] S2: High-pressure clean water is injected into the contaminated underground soil layer area to be remediated through the agent delivery unit and the remediation medium injection device;

[0038] S3: High-pressure agents are injected into the contaminated underground soil layer area to be remediated through the agent delivery unit and the remediation medium injection device;

[0039] S4: High-pressure clean water is injected into the contaminated underground soil layer area to be remediated through the agent delivery unit and the remediation medium injection device;

[0040] S5: High-pressure air is injected into the contaminated underground soil layer to be remediated via an air delivery unit and a remediation medium injection device. This method is suitable for the remediation of non-volatile contaminated soil or groundwater.

[0041] Alternatively, the soil and groundwater remediation method may include the following steps:

[0042] S1: Inject clean water into the contaminated underground soil layer area to be remediated through the agent delivery unit and the remediation medium injection device;

[0043] S2: Injecting agents into the contaminated underground soil layer area to be remediated through the agent delivery unit and the remediation medium injection device;

[0044] S3: Inject clean water into the contaminated underground soil layer to be remediated via a reagent delivery unit and a remediation medium injection device. This method is suitable for the remediation of soil or groundwater that may contain volatile pollutants.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. This invention provides a complete treatment system and method for soil and groundwater remediation that can switch between multiple methods such as in-situ agent injection remediation (microorganisms, chemical oxidizing agents, chemical reducing agents) and aeration remediation. The equipment can dynamically sense groundwater quality and hydrogeological conditions, thereby achieving balanced circulation remediation of soil and groundwater.

[0047] 2. This invention, through the injection and extraction process of the injection well, forms a dynamic hydraulic circulation between the injection well and the extraction well, thereby creating an effective change in soil hydraulic gradient, significantly improving the diffusion effect of the agent in the contaminated soil layer, shortening the remediation cycle, and timely sensing and predicting the remediation trend through the extraction dynamic sensing device, thus reducing operation and maintenance costs.

[0048] 3. In this invention, both the injection volume of the medium and the extraction volume of groundwater are precisely measured using flow meters. By analyzing the real-time data on the extraction and injection volumes, the hydrogeological conditions and hydraulic gradient of the site can be understood, allowing for timely adjustments to the injection strategy. For example, when entering a dry season or when the hydraulic gradient significantly decreases, the injection volume can be increased to intervene in the hydraulic gradient within a specific range, thereby improving the driving force for the diffusion of the agent in the soil.

[0049] 4. This invention integrates the injection of both gas and liquid media, and the injection pressure is precisely controllable. In contrast, traditional processes have limited functionality and uncontrollable injection pressure.

[0050] 5. The present invention injects fluid at appropriate pressure generated by the repair medium delivery device. The system uses a low-pressure pump to drive the high-pressure pump impeller and then starts the high-pressure pump to pressurize and inject the fluid. This can remove impurities and air that may exist in the pipeline in advance, ensuring the safety and stability of the high-pressure impeller assembly and reducing the probability of damage to the high-pressure pump.

[0051] 6. The repair medium delivery device of this invention incorporates a heat exchanger, which can ensure that the liquid injected underground is within a precise and controllable temperature range, avoiding the crystallization and precipitation of agent particles caused by low temperature that would block soil pores, and ensuring the effectiveness of agent diffusion.

[0052] 7. The repair medium conveying device of the present invention incorporates a filter, which can prevent the crystallization of the agent particles from entering the impeller assembly of the high-pressure pump, thus protecting the high-pressure pump assembly. It can also prevent the agent crystallization from entering the soil particles and clogging the soil pores, ensuring the effect of agent diffusion.

[0053] 8. This invention, through the combined control of the propulsion injector and the automatic hose winch, can precisely control the injection position of the agent, thereby achieving efficient mixing and reaction between the agent and the contaminated soil layer, and thus achieving precise remediation of the groundwater area of ​​the contaminated soil layer.

[0054] 9. This invention uses pipe jacking technology to penetrate horizontally into underground contaminated soil layers. Compared with the traditional vertical shaft technology, the injection range of the reagent medium covered by a single well is greatly increased, which can reduce the number of injection wells and thus reduce surface soil disturbance and environmental damage.

[0055] 10. This invention employs a deep-penetration agent injection method into the contaminated soil layer, which is less affected by soil hydrogeological conditions. The agent can rapidly contact and react with the target pollutants in the contaminated soil layer. Especially in oxidation or reduction remediation processes, this invention enables the agent to quickly contact the target pollutants in the contaminated soil layer or groundwater, reducing the possibility of agent failure in traditional methods due to slow hydraulic gradient diffusion. The residence time of the agent in contact with contaminated soil and groundwater directly determines the agent's effectiveness. Traditional oxidation-reduction agents are often easily interfered with by underground microorganisms and other factors under slow hydraulic gradient diffusion conditions. By the time they contact the target pollutant, the effective concentration of the agent may no longer be sufficient to achieve the remediation effect.

[0056] 11. The groundwater dynamic sensing device of the present invention can monitor the groundwater quality in a timely and dynamic manner. With the optimized arrangement of the probes, at least four important groundwater indicators can be monitored simultaneously. Through trend analysis of the monitoring data, the diffusion of the agent in the contaminated soil layer and the remediation effect can be accurately predicted. Thus, the remediation plan can be adjusted and optimized in a timely manner based on the data analysis, thereby maximizing the remediation efficiency, shortening the remediation cycle and reducing the remediation cost.

[0057] 12. This invention can be applied to a variety of different soil and groundwater remediation schemes with one system, including ex-situ extraction remediation, in-situ microbial remediation, in-situ groundwater aeration remediation, in-situ chemical oxidation remediation, in-situ chemical reduction remediation, and in-situ dual extraction remediation, which can effectively reduce the investment in soil and groundwater remediation facilities. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0059] Figure 2 This is a schematic diagram of the repair medium conveying device of the present invention;

[0060] Figure 3 This is a schematic diagram of the repair medium injection device of the present invention;

[0061] Figure 4 This is a schematic diagram of the structure of the groundwater extraction dynamic sensing device of the present invention;

[0062] Figure 5 This is a schematic diagram of the integrated online detection control cabinet of the present invention;

[0063] Figure 6 This is a schematic diagram of the overall structure of the repair medium delivery device, repair medium injection device, groundwater extraction dynamic sensing device, and groundwater treatment device of the present invention.

[0064] Figure 7 This is a schematic diagram of the structure of the groundwater treatment device of the present invention;

[0065] Figure 8 This is a schematic diagram of the propulsion injector of the present invention;

[0066] Figure 9 This is a front view of the propulsion injector of the present invention;

[0067] In the diagram: 1-Repair media conveying device, 11-Chemical delivery unit, 111-Clean water tank, 112-Chemical tank, 113-Chemical storage tank, 114-Low-pressure pump, 115-High-pressure pump, 116-Security filter, 117-Plate heat exchanger, 118-Recycled water tank, 119-Chemical delivery pump, 12-Compressed air delivery unit, 121-Air compressor, 122-Compressed air cylinder, 2-Repair media injection device, 21-Hose, 22 - Multi-hole jacking pipe, 23- Propulsion injector, 231- Integral support, 232- Multi-link support component, 2321- Driving rod, 2322- Driven rod, 2323- Slider, 233- Power propulsion component, 2331- Connecting plate, 2332- Servo motor, 2333- Reducer, 2334- Pulley, 234- Reaction force spin injection component, 2341- Reaction force spin nozzle, 2342- Medium delivery pipe, 2343- Pressure bearing 24-Automatic hose reel; 25-Hose protection elbow; 3-Groundwater extraction dynamic sensing device; 31-Groundwater extraction well; 32-Dry contact level gauge; 33-Integrated online detection and control cabinet; 331-pH online monitoring probe; 332-Conductivity online monitoring probe; 333-Oxidation-reduction potential online monitoring probe; 334-Sampling port; 34-Submersible pump; 35-Groundwater extraction platform; 36-Electric hoist; 37-Disc plate 4-Remediation agent injection well; 5-Contaminated underground soil layer area to be remediated; 6-Groundwater treatment device; 61-Groundwater buffer tank; 62-Reaction tank; 63-Inclined plate sedimentation tank; 64-Air flotation tank; 65-Clear water buffer tank; 66-Groundwater treatment agent metering pump; 67-Groundwater treatment agent tank; 68-Sludge tank; 69-Diaphragm pump; 610-Sludge dewatering filter press; a-Electromagnetic flow meter; b-Electric valve; c-Transfer pump. Detailed Implementation

[0068] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0069] Example 1

[0070] A soil and groundwater remediation system includes a remediation medium delivery device 1, a remediation medium injection device 2, and a groundwater extraction dynamic sensing device 3.

[0071] The remediation medium delivery device 1 includes a reagent delivery unit 11 and a compressed air delivery unit 12; the remediation medium injection device 2 includes a pressure-bearing hose 21, a porous jacking pipe 22, and a propulsion injector 23; and the groundwater extraction dynamic sensing device 3 includes a groundwater extraction well 31, a dry contact level gauge 32, and an integrated online monitoring and control cabinet 33. One end of the pressure-bearing hose 21 is connected to the reagent delivery unit 11 and the compressed air delivery unit 12, and the other end is connected to the propulsion injector 23. The porous jacking pipe 22 is inserted into the contaminated underground soil layer area 5 to be remediated. The propulsion injector 23 is installed inside the porous jacking pipe 22. The groundwater extraction well 31 is installed in the contaminated underground soil layer area to be remediated. A dry contact level gauge 32 for sensing the groundwater level is installed inside the well, and an integrated online monitoring and control cabinet 33 for monitoring groundwater indicators is installed outside the well.

[0072] Example 2

[0073] A soil and groundwater remediation system, such as Figure 1 As shown, it includes a repair medium delivery device 1, a repair medium injection device 2, and a groundwater extraction dynamic sensing device 3.

[0074] like Figure 2As shown, the repair medium delivery device 1 includes a chemical delivery unit 11, a compressed air delivery unit 12, and a control unit. The chemical delivery unit 11 includes a recycled water tank 118, a clean water tank 111, at least three chemical tanks 112, a chemical storage tank 113, a low-pressure pump 114, an electromagnetic flowmeter a, a security filter 116, a plate heat exchanger 117, a high-pressure pump 115, and related pipes, an electric valve b, a pressure gauge, and a level gauge. The chemical tanks 112 pass through an output water pipe sequentially through the electric valve b and the chemical delivery pump 119 before entering the chemical storage tank 113. Here, the electric valve b can be used to switch the type of chemical to be delivered. The repair chemical passes through the output end of the chemical storage tank 113 sequentially through the low-pressure pump 114, the electromagnetic flowmeter a, the plate heat exchanger 117, the security filter 116, the high-pressure pump 115, and the electric valve b, and then connects to the repair medium injection device 2. The compressed air delivery unit 12 includes an air compressor 121, a compressed air cylinder 122, and related pipelines and electric valves b. The air compressor 121 compresses the air, which then passes through the compressed air cylinder 122 and electric valve b before being fed into the repair medium injection device 2. The chemical delivery unit 11 and the compressed air delivery unit 12 are connected to the repair medium injection device 2 via their respective electric valves b. The control unit uses a PLC module to collect the status of equipment such as chemical level gauges, electric valves, electromagnetic flow meters, pressure sensors, pumps, high-pressure pumps, and air compressors within the system. Based on the level gauge signal, it determines the chemical inventory and whether the remaining chemical can meet the requirements of this repair task. Based on the pressure sensor signal, it synchronously adjusts the parameters of the high-pressure pump frequency converter to ensure that the pressure meets the repair process requirements. It switches the electric valves of the chemical output pipeline according to the process requirements to achieve the switching of different chemicals. It switches the electric valves according to the set process route to achieve the switching between high-pressure chemicals and high-pressure air for high-pressure injection. As a preferred technical solution of the present invention: the valves in the repair medium conveying device 1 are electric ball valves, and each ball valve is controlled by a PLC module to switch the valves on and off according to process requirements.

[0075] like Figure 3As shown, the remediation medium injection device 2 includes an automatic hose winch 24, a pressure-bearing hose 21, a porous jacking pipe 22, a propulsion injector 23, and a hose protection elbow 25. The porous jacking pipe 22 is jacked into the contaminated underground soil layer area 5 to be remediated according to the requirements of the soil and groundwater remediation plan. The remediation medium delivery device 1 delivers the remediation agent to the remediation medium injection device 2 under high pressure, which is then carried by the pressure-bearing hose 21 into the propulsion injector 23. The injector propels forward within the porous jacking pipe 22 using the reaction force of the high-pressure medium injection, and rotates 360° tangentially to inject the remediation agent under high pressure. During the forward propulsion of the propulsion injector 23, the automatic hose winch 24 coordinates with its propulsion action to release the hose. After injection is completed, the automatic hose winch 24 automatically retracts the hose and drives the injector back to its original position. The hose protection elbow 25 is located at the boundary between the remediation agent injection well 4 and the contaminated underground soil layer area to be remediated. The pressure-bearing hose 21 passes through the hose protection elbow 25 and extends into the porous jacking pipe 22.

[0076] like Figure 4 As shown, the groundwater extraction dynamic sensing device 3 includes a groundwater extraction well 31, a submersible pump 34, a dry contact level gauge 32, a groundwater extraction platform 35, an electric hoist 36, a disc filter 37, an integrated online monitoring and control cabinet 33, an electric valve b, an electromagnetic flow meter a, and the necessary pipelines. The groundwater extraction well 31 is installed in the contaminated underground soil layer area to be remediated according to the requirements of the soil and groundwater remediation plan. The groundwater extraction platform 35 is placed above the extraction well 31, and an electric hoist 36 is installed on a support above the platform. The electric hoist 36 hoists and controls the submersible pump 34 to the height required by the remediation plan. Four to six dry contact level gauges 32 are arranged inside the extraction well to sense the groundwater level. Further, the groundwater is pumped by the submersible pump 34 to the disc filter 37. The filtered groundwater enters the integrated online monitoring and control cabinet 33, which is equipped with an online pH monitoring probe 331, an online conductivity monitoring probe 332, an online oxidation-reduction potential monitoring probe 333, and an online TOC monitoring probe. Furthermore, the control cabinet is equipped with a PLC module and a communication TPU module. The PLC module controls the submersible pump 34, the electric hoist 36, and the electric valve b, and collects online monitoring data at a set frequency. This data is then transmitted to a cloud server via the communication TPU module, enabling remote real-time monitoring of groundwater data. When the groundwater level reaches a high level, the electric valve b automatically switches to transport the groundwater to the groundwater treatment device. The rest is the same as in Example 1.

[0077] A soil and groundwater remediation method employs a five-step injection process: ① high-pressure air → ② high-pressure water → ③ high-pressure chemicals → ④ high-pressure water → ⑤ high-pressure air. The injection process is as follows:

[0078] Air, water, medicine, water, air:

[0079] ① Air is used to create soil pores, which helps subsequent agents diffuse;

[0080] ② Water is used to lubricate the injector and track, and to perform self-testing.

[0081] ③ The reagents are used for the remediation of characteristic contamination of soil and groundwater;

[0082] ④ Water is used to clean the pipes and push the pesticide into the soil pores, creating a stronger hydraulic gradient to help the pesticide diffuse;

[0083] ⑤ Air is used to dry and flush the pipes and further aids in the diffusion of the agent.

[0084] Example 3

[0085] A soil and groundwater remediation system, wherein the arrangement of pH online monitoring probe 331, conductivity online monitoring probe 332, redox potential online monitoring probe 333, and TOC online monitoring probe in the control cabinet is as follows: Figure 5 As shown, the entire structure is arranged in an "N" shape through pipes and threaded tees, and a sampling port 334 is provided. The rest is the same as in Example 2.

[0086] Traditional groundwater quality monitoring facilities involve submerging probes into wells. This method suffers from high failure rates due to the probes being constantly exposed to a humid environment, significant signal interference over long transmission distances, and limited space within the well, restricting the number of probes that can be installed. This invention optimizes the probe installation process by innovatively employing an "N"-shaped cyclic online monitoring device installation mode. This allows for the simultaneous installation of multiple probes, with the probe sensors aligned with the water flow direction, ensuring sufficient contact between the sensors and the fluid and guaranteeing monitoring accuracy. The use of threaded tees for quick probe installation and removal improves the convenience of probe cleaning, calibration, and maintenance, while simultaneously reducing the probability of probe damage caused by disassembly and reassembly.

[0087] Example 4

[0088] A soil and groundwater remediation system, such as Figures 6-7 As shown, the device includes a repair medium delivery device 1, a repair medium injection device 2, a groundwater extraction dynamic sensing device 3, and a groundwater treatment device 6. The groundwater treatment device 6 comprises, in sequence, a groundwater buffer tank 61, a reaction tank 62, an inclined plate sedimentation tank 63, an air flotation tank 64, and a clear water buffer tank 65. The groundwater buffer tank 61 is connected to the groundwater extraction dynamic sensing device 3, and the clear water buffer tank 65 is connected to the recycled water tank 118 of the repair medium delivery device 1.

[0089] Furthermore, reaction tank 62 is connected to groundwater treatment agent tank 67 via groundwater treatment agent metering pump 66, and sludge tank 68 is connected to inclined plate sedimentation tank 63 and air flotation tank 64. Sludge tank 68 is connected to sludge dewatering filter press 610 via diaphragm pump 69. Transfer pumps c are installed between groundwater buffer tank 61 and reaction tank 62, and between clear water buffer tank 65 and recycled water tank 118. The rest is the same as in Example 3.

[0090] The process of groundwater treatment device 6 is as follows: groundwater extracted by groundwater extraction dynamic sensing device 3 → groundwater buffer tank 61 → reaction tank 62 → inclined plate sedimentation tank 63 → air flotation tank 64 → clear water buffer tank 65 → recycled water tank 118.

[0091] The sludge produced is buffered in sludge tank 68, pressurized by diaphragm pump 69, and then dewatered in sludge dewatering filter press 610 before being transported out.

[0092] Advantages of this process:

[0093] 1. Among them, reaction tank 68 can be added 1-2 times according to process requirements. The reagents can be switched according to process requirements, such as adding oxidizing agents, reducing agents, coagulation and sedimentation agents, etc.

[0094] 2. After treatment in the inclined plate sedimentation tank 63 and the air flotation tank 64, heavy metal pollutants in the groundwater are effectively removed;

[0095] 3. The treatment by the inclined plate sedimentation tank 63 and the air flotation tank 64 can intercept particulate pollutants in the groundwater and protect the equipment of the subsequent remediation medium conveying device 1 and remediation medium injection device 2 (the high pressure injection and conveying equipment has high requirements for the particulate matter content in the medium).

[0096] This embodiment provides a complete soil and groundwater remediation system and method that can switch between multiple methods such as in-situ agent injection remediation (microorganisms, chemical oxidizing agents, chemical reducing agents), aeration remediation, and groundwater extraction remediation. The equipment can dynamically sense groundwater quality and hydrogeological conditions, thereby achieving balanced circulation remediation of soil and groundwater.

[0097] Example 5

[0098] A soil and groundwater remediation system, such as Figures 8-9As shown, the propulsion injector 23 includes an integral support 231 and a multi-link support component 232, a power propulsion component 233, and a reaction force spin injection component 234, all mounted on the integral support 231. The multi-link support component 232 includes a driving rod 2321, a driven rod 2322, and a slider 2323. The driving rod 2321 is connected to the integral support 231 via the slider 2323. The driven rod 2322 is fixed to the integral support 231 and moves in conjunction with the driving rod 2321. The power propulsion component 233 includes a connecting plate 2331, a servo motor 2332, a reducer 2333, and a pulley 2334. The connecting plate 2331 connects to the driving rod 2321. The servo motor 2332, in conjunction with the reducer 2333, drives the pulley 2334 to inject power into the entire propulsion system. The injector provides forward and backward propulsion; the reaction force spin injection component 234 includes a reaction force spin nozzle 2341, a medium delivery pipe 2342, and a pressure-bearing hose connector 2343. The pressure-bearing hose connector 2343 is used to connect to the hose 21. The high-pressure medium in the hose 21 is transported to the reaction force spin nozzle 2341 through the medium delivery pipe 2342. The reaction force spin nozzle 2341 injects compressed high-pressure medium through a 360° rotation of the reaction force. The multi-link support component 232 ensures that the pulley 2334 is in close contact with the outer sleeve (perforated jacking pipe 22). In this embodiment, three sets of multi-link support components 232 and power propulsion components 233 are arranged around the integral support 231. The rest is the same as in embodiment 1.

[0099] This embodiment provides a novel groundwater remediation medium injection component, which, in conjunction with other devices, can ensure the precise injection of the remediation medium.

[0100] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A method for soil and groundwater remediation, characterized in that, The soil and groundwater remediation system is used, which includes a remediation medium delivery device (1), a remediation medium injection device (2), and a groundwater extraction dynamic sensing device (3). The repair medium delivery device (1) includes a drug delivery unit (11) and a compressed air delivery unit (12). The drug delivery unit (11) includes a clean water tank (111), a drug tank (112), a drug storage box (113), a low-pressure pump (114), a high-pressure pump (115), and an electromagnetic flow meter; The input end of the medicine storage tank (113) is connected to the water tank (111) and the medicine tank (112), and the output end is connected to the repair medium injection device (2) after passing through the low pressure pump (114), the electromagnetic flow meter and the high pressure pump (115) in sequence. The remediation medium injection device (2) includes a pressure hose (21), a porous jacking pipe (22), and a propulsion injector (23). One end of the pressure hose (21) is connected to the agent delivery unit (11) and the compressed air delivery unit (12), and the other end is connected to the propulsion injector (23). The porous jacking pipe (22) is jacked into the contaminated underground soil layer area to be remediated, and the propulsion injector (23) is installed inside the porous jacking pipe (22). The propulsion injector (23) is a reaction force spin propulsion injector, including an integral support (231) and a multi-link support component (232), a power propulsion component (233) and a reaction force spin injection component (234) disposed on the integral support (231). The reaction force spin injection component (234) includes a reaction force spin nozzle (2341), a medium delivery pipe (2342), and a pressure-bearing hose connector (2343). The pressure-bearing hose connector (2343) is used to connect the hose (21). The high-pressure medium in the hose (21) is transported to the reaction force spin nozzle (2341) through the medium delivery pipe (2342). The reaction force spin nozzle (2341) injects the compressed high-pressure medium by rotating 360° with the reaction force. The repair medium injection device (2) also includes an automatic hose winch (24) and a hose protection elbow (25). During the forward movement of the injector (23), the automatic hose winch (24) releases the pressure hose (21) in coordination with its propulsion action. After the injection is completed, the automatic hose winch (24) retracts the hose and drives the injector (23) back to its original position. The hose protection elbow (25) is set at the junction of the remediation agent injection working well (4) and the contaminated underground soil layer area to be remediated. The pressure hose (21) passes through the hose protection elbow (25) and extends into the porous jacking pipe (22). The groundwater extraction dynamic sensing device (3) includes a groundwater extraction well (31), a dry contact level gauge (32) for sensing the groundwater level height, and an integrated online detection and control cabinet (33) for monitoring groundwater indicators. The groundwater extraction well (31) is set in the area of ​​the polluted underground soil layer to be remediated. The dry contact level gauge (32) is set inside the well, and the integrated online detection and control cabinet (33) is set outside the well. Compressed air is injected into the contaminated underground soil layer area to be remediated through the compressed air delivery unit (12) and the remediation medium injection device (2); Clean water is injected into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); agents are injected into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); The soil and groundwater remediation method includes the following steps: S1: High-pressure air is injected into the contaminated underground soil layer area to be repaired through the compressed air delivery unit (12) and the repair medium injection device (2); S2: High-pressure clean water is injected into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); S3: High-pressure agents are injected into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); S4: High-pressure clean water is injected into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); S5: High-pressure air is injected into the contaminated underground soil layer area to be remediated through the compressed air delivery unit (12) and the remediation medium injection device (2); this method is suitable for remediation of non-volatile contaminated soil or groundwater. Alternatively, the soil and groundwater remediation method may include the following steps: S1: Inject clean water into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); S2: Inject the agent into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); S3: Inject clean water into the contaminated underground soil layer area to be remediated through the agent delivery unit (11) and the remediation medium injection device (2); this method is suitable for the remediation of soil or groundwater containing volatile pollutants.

2. The soil and groundwater remediation method according to claim 1, characterized in that, The output end of the medicine storage tank (113) is connected to the repair medium injection device (2) via a low-pressure pump (114), an electromagnetic flow meter, a plate heat exchanger (117), a security filter (116), a high-pressure pump (115), and an electric valve.

3. The soil and groundwater remediation method according to claim 1, characterized in that, The drug delivery unit (11) further includes a recycled water tank (118) and a drug delivery pump (119). The recycled water tank (118), the clean water tank (111), and the drug tank (112) are connected to the input end of the drug storage tank (113) via the drug delivery pump (119). The recycled water tank (118) is connected to the groundwater extraction well (31) or the groundwater treatment device.

4. The soil and groundwater remediation method according to claim 1, characterized in that, The compressed air delivery unit (12) includes an air compressor (121), a compressed air cylinder (122) and an electric valve. The air compressor (121) compresses the air and then connects to the repair medium injection device (2) after passing through the compressed air cylinder (122) and the electric valve.

5. The soil and groundwater remediation method according to claim 1, characterized in that, The repair medium delivery device (1) also includes a control unit, which uses a PLC module to control the agent delivery unit (11) and the compressed air delivery unit (12).

6. The soil and groundwater remediation method according to claim 1, characterized in that, The groundwater extraction dynamic sensing device (3) also includes a submersible pump (34), a groundwater extraction platform (35), an electric hoist (36), and a disc filter (37). The groundwater extraction platform (35) is set above the groundwater extraction well (31). An electric hoist (36) is installed on the support above the platform. The electric hoist (36) lifts and controls the submersible pump (34) to the height required by the repair plan. The groundwater is transported to the disc filter (37) through the submersible pump (34). The filtered groundwater enters the integrated online detection and control cabinet (33).

7. The soil and groundwater remediation method according to claim 1, characterized in that, The integrated online detection control cabinet (33) is equipped with an online pH monitoring probe, an online conductivity monitoring probe, an online oxidation-reduction potential monitoring probe, and an online TOC monitoring probe; The integrated online detection control cabinet (33) is also equipped with a PLC module and a communication TPU module.

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