Contaminated soil and / or underground water bubble in-situ circulation remediation system and application thereof

Abstract

The invention relates to a polluted soil and / or underground water bubble in-situ circulation remediation system and application thereof. The circulation remediation system comprises a circulation remediation well, a bubble remediation liquid generation subsystem, a remediation liquid circulation subsystem and a foam blocking subsystem. The circulating repair well is arranged in a polluted area (7); the bubble repair liquid generation subsystem is used for generating nano and / or micro-nano bubbles through repair liquid and gas so as to adsorb and degrade pollutants in the polluted area (7); the repairing liquid circulation subsystem is used for purifying the bubble repairing liquid and then recycling the bubble repairing liquid; a foam barrier subsystem is connected to the contaminated area (7), the foam barrier subsystem for forming a contaminated foam barrier layer. Compared with the prior art, nano and / or micro-nano bubble repairing, recycling, in-situ blocking and in-situ repairing of polluted soil and / or underground water are achieved through the characteristics of nano and / or micro-nano bubbles, and the method has the advantages of being low in disturbance, low in secondary pollution risk, safe, environmentally friendly in repairing and the like.

Description

Technical Field

[0001] The present invention relates to the field of environmental technologies, and in particular, to an in-situ cyclic remediation system for contaminated soil and / or groundwater by means of air bubbles and its application. Background Art

[0002] With the rapid development of industrialization and urbanization, the problem of soil pollution has become increasingly serious. A large amount of heavy metals and organic pollutants generated by industrial activities enter the soil through atmospheric deposition, sewage irrigation, solid waste stacking and other means. The unreasonable use and residues of chemical fertilizers and pesticides will also accumulate in the soil, causing pollution to farmland soil. Pollutants in the soil can easily penetrate into groundwater. Illegal discharge of industrial wastewater, leakage of landfill leachate, and infiltration of a large amount of chemical fertilizers and pesticides through soil pores will all lead to groundwater pollution. Currently, there are two methods for treating contaminated soil and groundwater: in-situ remediation and ex-situ remediation. Among them, in-situ remediation is considered the future development direction of soil and groundwater remediation in the industry due to its small engineering volume and low investment.

[0003] Patent No. CN105621643B provides "a method for increasing dissolved oxygen in water to supersaturation and a dissolved oxygen increasing system". After releasing the oxygen carried in the supersaturated dissolved oxygen water into micro-nano bubbles through a micro-nano bubble generating device, the sewage carrying the micro-nano bubbles is re-circulated into the water area through a pusher to achieve the supersaturated dissolved oxygen increasing treatment of black and odorous water. This invention mainly aims at aerating surface black and odorous water bodies and provides a method for preparing supersaturated dissolved oxygen water. However, it does not specifically design how to inject oxygen-rich bubbles and solution into a complex underground environment, and the entire system cannot be directly applied to the remediation and disposal of site soil / groundwater.

[0004] Patent No. CN109570212A provides the patent "a method for in-situ soil flushing and remediation". By laying a sprinkler pipeline and a sprinkler device above the contaminated soil, extraction wells are set at the periphery and in the middle of the contaminated soil, and an air extraction device is installed in the extraction wells; a slant well is drilled above the contaminated soil using a drill, and an ultrasonic generating device is installed inside the slant well. The method for in-situ soil flushing and remediation described in this invention reduces the cost of in-situ soil flushing and remediation, and expands the diffusion area of the flushing agent, enabling a wider contact area between the pollutants in the soil and the flushing liquid. However, this method requires the erection of sprinkler pipes and the excavation of extraction wells during the in-situ remediation process, and the subsequent treatment volume of the flushing liquid is large and the workload is large.

[0005] Traditional pollution remediation methods have many limitations, such as high cost, long remediation cycle, secondary environmental pollution, etc. In-situ remediation, as a technology that can comprehensively utilize chemical, physical, biological and other processes to achieve in-situ remediation of groundwater, has the potential to combine with other remediation technologies. By forming a three-dimensional circulating flow field in the surrounding area of the remediation, the circulating flow flushes and drives pollutants into the well, and volatile or gaseous organic compounds are removed through aeration stripping and extraction. At the same time, the aeration process can increase the oxygen content in groundwater and strengthen the degradation of organic pollutants by indigenous microorganisms, so as to achieve the removal of organic pollutants in groundwater and soil. However, there are still some problems in the combined use of soil and groundwater circulation well technology and aeration method at present, such as the inability to effectively treat main pollutants, the small area of its circulating flow field or ineffective circulation, the short residence time of bubbles in water, the secondary pollution caused by direct gas discharge into the atmosphere, and the migration of pollutants in soil or groundwater during the remediation process still exist. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a nano and / or micro-nano bubble in-situ circulation remediation system for polluted soil and / or groundwater and its application. Through the characteristics of nano and / or micro-nano bubbles, the nano and / or micro-nano bubble remediation, recycling, in-situ barrier and in-situ remediation of polluted soil and / or groundwater are realized, which has the advantages of low disturbance, low risk of secondary pollution and safe and green remediation.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The first purpose of the present invention is to provide a nano and / or micro-nano bubble in-situ circulation remediation system for polluted soil and / or groundwater. The circulation remediation system includes a circulation remediation well, a bubble remediation liquid generation subsystem, a remediation liquid circulation subsystem and a foam barrier subsystem;

[0009] The circulation remediation well is connected to the polluted area and is arranged in the polluted area;

[0010] The bubble remediation liquid generation subsystem is connected to the circulation remediation well;

[0011] The remediation liquid circulation subsystem is connected to the circulation remediation well;

[0012] The bubble remediation liquid generation subsystem is connected to the remediation liquid circulation subsystem;

[0013] The bubble remediation liquid generation subsystem is used to generate nano and / or micro-nano bubbles through the remediation liquid and gas to adsorb and degrade pollutants in the polluted area of soil and / or groundwater;

[0014] The remediation liquid circulation subsystem is used to purify the bubble remediation liquid and recycle it;

[0015] The foam barrier subsystem is connected to the contaminated area, and the foam barrier subsystem is used to generate foam in the soil and / or groundwater contaminated area to form a contaminated foam barrier layer.

[0016] Furthermore, the bubble repair liquid generating subsystem includes a gas generating device, a bubble repair liquid generating device, and a pressurizing device;

[0017] The gas generating device is connected to the bubble repair liquid generating device;

[0018] The pressurizing device is connected to the bubble repair liquid generating device, the pressurizing device is connected to the circulation repair well, and the pressurizing device is used to send the bubble repair liquid generated by the bubble repair liquid generating device into the contaminated area through the circulation repair well.

[0019] Furthermore, the repair liquid circulation subsystem includes a circulation extraction device, a first repair liquid detection device, a repair liquid treatment device, a second repair liquid detection device, a purification material recycling device, a solid waste resource utilization device, and a gas purification device;

[0020] The circulation extraction device is connected to the circulation repair well, and the circulation extraction device extracts the bubble repair liquid through the circulation repair well. The circulation extraction device is used to extract the repaired bubble repair liquid from the circulation repair well and then send it to the first repair liquid detection device;

[0021] The first repair liquid detection device is connected to the circulation extraction device, and the first repair liquid detection device is connected to the repair liquid treatment device;

[0022] The repair liquid treatment device is connected to the second repair liquid detection device, the repair liquid treatment device is connected to the purification material recycling device, the repair liquid treatment device is connected to the solid waste resource utilization device, and the repair liquid treatment device is connected to the gas purification device;

[0023] The gas purification device is connected to the bubble repair liquid generating device, the gas purification device is connected to the solid waste resource utilization device, and the gas purification device is used to purify and recycle the gas emitted after repair, that is, the separated gas), reduce production costs, reduce resource waste and environmental pollution;

[0024] The repair liquid treatment device is used to separate the repair liquid, pollutants, and solid impurities, and obtain the first separated solid, separated gas, and purification material. The first separated solid enters the solid waste resource utilization device for recycling. The purification material is reused through the purification material reuse device, and the reused purification material returns to the repair liquid treatment device. After filtration in the purification material reuse device, the solid impurities are dehydrated and dried and enter the solid waste resource utilization device for centralized resource utilization. The separated gas enters the gas purification device for gas purification, and the obtained purified gas enters the bubble repair liquid generating device for gas collection and reuse. The obtained second separated solid enters the solid waste resource utilization device for recycling, and the obtained separated liquid enters the repair liquid treatment device for recycling and reuse.

[0025] Further, the foam barrier subsystem includes a foam generator and a barrier foam.

[0026] The foam generator is connected to the contaminated soil, and the foam generator is used to generate the barrier foam and inject the barrier foam into the contaminated area.

[0027] Further, the outlet of the repair liquid treatment device and the inlet of the purification material reuse device in the circulating repair system are connected by a pipeline, and the inlet of the repair liquid treatment device and the outlet of the purification material reuse device in the circulating repair system are connected by a pipeline, forming a repair liquid purification material regeneration loop for repeatedly using the purification material to purify the bubble repair liquid.

[0028] Further, the bubble repair liquid generating device, pressurizing device, circulating repair well, circulating extraction device, first repair liquid detection device, repair liquid treatment device, and second repair liquid detection device in the circulating repair system are sequentially connected by pipelines, and the second repair liquid detection device is connected to the bubble repair liquid generating device by a pipeline, forming a repair liquid detection circulation loop for detecting whether the bubble repair liquid meets the standards. The qualified repair liquid is recycled, and the unqualified repair liquid is recycled after being re-purified with the purification material.

[0029] Further, the outlet of the repair liquid treatment device and the inlet of the gas purification device in the circulating repair system are connected by a pipeline, and the inlet of the repair liquid treatment device and the outlet of the gas purification device in the circulating repair system are connected by a pipeline, forming a repair liquid disposal and reuse pipeline for repeatedly using the purification material to purify the bubble repair liquid.

[0030] Further, the repair liquid treatment device is used for the purification and recycling of the repair liquid, and the gas purification device is used for the purification and recycling of the post-repair and escaped gas into the bubble repair liquid generating device.

[0031] Further, the first repair liquid detection device is used to detect the pollution concentration and the nano- and / or micro-nano bubble content after the bubble repair liquid completes the repair, and the second repair liquid detection device is used to detect whether the bubble repair liquid meets the requirements for recycling after purification treatment, and to detect whether the pollutant concentration in the repair liquid meets the requirements for recycling.

[0032] Further, the repair liquid is injected horizontally and vertically into the polluted area by the multi-functional repair well (i.e., the circulating repair well), and the repair liquid is extracted from the bottom to form a full-space repair mode. After post-treatment such as extraction treatment, the repair liquid enters the bubble repair liquid generating device for recycling.

[0033] Further, the circulating repair system further includes a monitoring subsystem within the polluted area;

[0034] The monitoring subsystem within the polluted area is arranged within the polluted area and is used to monitor the parameters of the soil and / or groundwater during the repair process in real time. The data obtained through the monitoring system provides a basis for the optimization and adjustment of the circulating repair system; multi-parameter soil sensors: can integrate monitoring modules such as moisture, temperature, conductivity, pH, nitrogen, phosphorus, and potassium; tube-type soil automatic soil moisture monitor: uses highly sensitive sensors to automatically sense changes in soil moisture content, temperature, etc.; soil organic matter on-line detection sensor: uses technologies such as near-infrared spectroscopy, conductivity method, Fourier transform infrared spectroscopy, and impedance spectroscopy to measure the content of organic matter in the soil in real time and continuously; groundwater quality monitor (multi-parameter water quality monitor): can be connected to a variety of parameter sensors at the same time, and can continuously detect indicators such as pH, conductivity, dissolved oxygen, turbidity, temperature, water level, etc. of the water quality, and items such as ORP, residual chlorine, COD, ammonia nitrogen, suspended solids, and microorganisms.

[0035] The monitoring subsystem within the polluted area includes monitoring wells;

[0036] The parameters include pollutant concentration, pH value, redox potential, etc.

[0037] Further, the layout of the monitoring wells comprehensively reflects the repair effect of the polluted area, and the data obtained through monitoring provides a basis for the optimization and adjustment of the repair system.

[0038] Further, the circulating repair system further includes a control device;

[0039] The control device is connected to the bubble repair liquid generating device of the bubble repair liquid generating subsystem;

[0040] The control device is connected to the monitoring wells of the monitoring subsystem within the polluted area;

[0041] The control device is used to automatically adjust the working state of the bubble repair fluid generating device in the bubble repair fluid generating subsystem according to the parameter information feedback by the monitoring wells of the monitoring subsystem in the pollution area, such as the gas-liquid mixing ratio, the bubble generation frequency, etc., so as to achieve precise repair. The control device has data storage, analysis and remote transmission functions, which is convenient for users to grasp the repair progress and effect at any time, and realizes the intelligent management of the repair process.

[0042] Further, the circulating repair system further includes a power supply device; the power supply device is connected to the bubble repair fluid generating device in the bubble repair fluid generating subsystem to provide stable power support for it. The power supply device can adopt a solar power supply device, which converts solar energy into electrical energy by using solar panels, or a storage battery can also be used to ensure the normal operation of the power supply device and the bubble repair fluid generating device in the bubble repair fluid generating subsystem under different working conditions.

[0043] Further, the circulating repair well includes:

[0044] An inner well pipe, which is arranged at the rear end of the circulating repair well;

[0045] An outer well pipe, which is sleeved outside the inner well pipe;

[0046] A well head, which is arranged at the front end of the circulating repair well;

[0047] A porous structure, which is arranged between the well head and the inner well pipe;

[0048] A branch pipe of the circulating repair well, which is connected to the outer well pipe. The outer well pipe injects the bubble repair fluid into the soil or groundwater pollution area through the branch pipe of the circulating repair well;

[0049] A branch pipe connection, which connects the branch pipe of the circulating repair well and the outer well pipe. The branch pipe connection is used to connect the branch pipe of the circulating repair well and the outer well pipe to pass the bubble repair fluid, and to adjust the position and angle of the branch pipe of the circulating repair well according to the change of the repair depth.

[0050] Further, the well head is wedge-shaped and is used to insert into the polluted soil and / or groundwater area.

[0051] Further, the circulating repair well further includes:

[0052] A sedimentation pipe, which is arranged at the lower end of the well head;

[0053] A connecting rod, which is connected to the sedimentation pipe. The connecting rod is used to extract the sedimentation pipe to remove the sediment;

[0054] A well partition, which is used to isolate the repair fluid injection area and the repair fluid recovery area;

[0055] A well partition is provided between the in-well pipe and the porous structure, and a well partition is provided between the well head and the porous structure.

[0056] Further, the circulating repair well further includes:

[0057] A branch well tip, which is connected to the branch pipe of the circulating repair well. The branch well tip is provided at the end of the branch pipe of the circulating repair well and is used to assist the branch pipe of the circulating repair well to enter different repair areas;

[0058] A well top port, which is provided at the rear ends of the outer well pipe and the inner well pipe. The well top port is used to assist in lifting the circulating repair well.

[0059] Further, the end of the branch pipe of the circulating repair well is rotatably connected to the outer well pipe through a branch pipe connection;

[0060] A plurality of groups of branch pipes of the circulating repair well are provided along the axial direction of the outer well pipe;

[0061] In each group of branch pipes of the circulating repair well, multiple branch pipes of the circulating repair well are evenly distributed along the circumferential direction of the outer well pipe;

[0062] The branch pipe connection includes a connecting hose. The two ends of the connecting hose are respectively connected to the branch pipe of the circulating repair well and the outer well pipe. The connecting hose connects the branch pipe of the circulating repair well and the outer well pipe to introduce the bubble repair liquid in the outer well pipe into the branch pipe of the circulating repair well.

[0063] Further, the outer well pipe of the circulating repair well is connected to the branch pipe of the circulating repair well. When the branch pipe of the circulating repair well is pressed into the repair area, after the branch pipe of the circulating repair well is brought together and closely attached to the outer well pipe through the branch pipe connection and inserted into the polluted area, the circulating repair well drives the branch pipe of the circulating repair well to horizontally insert into the repair area during the upward movement process;

[0064] A well top port is provided at the upper end of the circulating repair well. By lifting the well top port of the circulating repair well, the whole circulating repair well moves upward;

[0065] During the upward movement of the circulating repair well, the branch well tip of the branch pipe of the circulating repair well drives the branch pipe of the circulating repair well to horizontally unfold.

[0066] Further, multiple circulating repair wells are combined or used separately according to the scope of the polluted area. The multi-functional main pipe of the circulating repair well (including the outer well pipe and the inner well pipe) and its branch pipes (the branch pipes of the circulating repair well) horizontally unfold to form a longitudinal and transverse spatial three-dimensional repair area network.

[0067] Further, the outlets of the outer well pipe of the circulating repair well, the outlets of the branch pipes of the circulating repair well, and the top of the circulating repair well are of porous structures. The outer well pipe and the branch pipes of the circulating repair well disperse the repair liquid into the repair area, and the porous filtration at the top of the circulating repair well is used to prevent solid impurities in the extracted repair liquid from entering the circulation system.

[0068] Furthermore, the cyclic remediation well is divided into an inner well pipe and an outer well pipe. The outer well pipe is used to inject the remediation liquid into the contaminated area. The inner well pipe extracts the remediation liquid through suction filtration at the bottom of the wellhead. After the remediation liquid remediates the contaminated soil and / or groundwater, the treated remediation liquid is recycled. The branch pipe of the cyclic remediation well is hinged to the outer pipe. When the remediation well drills downward into the soil, the branch pipe drills into the soil in the same direction as the drilling. When the well is lifted, the branch pipe unfolds horizontally to inject the remediation liquid horizontally. The outer well pipe injects the remediation liquid longitudinally. The branch pipe of the cyclic remediation well is connected to the outer well pipe through a branch pipe (hinge). When the cyclic remediation well drills downward into the soil, the branch pipe of the cyclic remediation well drills into the soil in the same direction as the drilling. When the branch pipe of the cyclic remediation well is lifted, the branch pipe of the cyclic remediation well unfolds horizontally to inject the remediation liquid horizontally. The outer well pipe injects the remediation liquid longitudinally. The porous filtration of the cyclic remediation well is used to prevent solid impurities in the extracted remediation liquid from entering the cycle.

[0069] Furthermore, when the cyclic remediation well drills to the remediation depth, the main pipe (including the outer well pipe and the inner well pipe) is vertically inserted into the remediation area for longitudinal remediation, and the branch pipe (the branch pipe of the cyclic remediation well) unfolds horizontally for horizontal remediation. The bottom extraction of the remediation well forms a three-dimensional cyclic remediation system. The cyclic remediation well is divided into an outer well pipe and an inner well pipe. The outer well pipe is used to inject the remediation liquid into the contaminated area. The inner well pipe extracts the remediation liquid through suction filtration at the bottom of the wellhead (well head). After the remediation liquid remediates the soil and groundwater, the treated remediation liquid is recycled through bubble generation.

[0070] Furthermore, the remediation liquid enters the contaminated area through the main pipe (including the outer well pipe and the inner well pipe) and the branch pipe (the branch pipe of the cyclic remediation well) of the cyclic remediation well, and the remediation liquid is repaired from top to bottom under the action of gravity;

[0071] A porous structure is arranged at the upper end of the well head for the extraction device to extract and recycle the remediation liquid, and the porous structure is used to filter large particle impurities;

[0072] A sedimentation pipe is arranged at the bottom end of the cyclic remediation well for collecting accumulated fine particle impurities, and the sedimentation pipe is connected through a connecting rod to remove the sediment in the well;

[0073] A partition (well partition) is arranged in the remediation well to isolate the remediation liquid injection area and the remediation liquid recovery area to prevent the mixing of the remediation liquid.

[0074] Furthermore, the cyclic remediation system can remediate heavy metals, organic substances or heavy metal-organic comprehensive pollutants simultaneously or separately, reducing the amount of remediation liquid used while reducing the remediation cost. Each unit can be independently applied to small-scale contaminated areas, or multiple units can be combined for the remediation of large-scale areas.

[0075] Further, the cyclic repair well directly drills into the repair depth, the main pipe (including the outer pipe and the inner pipe of the well) is vertically inserted into the repair area for longitudinal repair, the branch pipe (the branch pipe of the cyclic repair well) is horizontally deployed for horizontal repair, and bottom extraction forms a comprehensive three-dimensional cyclic repair.

[0076] The second object of the present invention is to provide an application of the in-situ cyclic repair system for contaminated soil and / or groundwater bubbles, and use the in-situ cyclic repair system for contaminated soil and / or groundwater bubbles to repair the pollution in the soil and / or groundwater pollution area.

[0077] Further, the cyclic repair well is connected to nano and / or micro-nano bubble repair liquid purification materials and gas purification materials, and the purification materials are regenerated and recycled;

[0078] The cyclic repair well is connected to a detection circulation loop for nano and / or micro-nano bubble repair liquid and repair gas. After the detection reaches the standard, the repair liquid and the repair gas enter the cyclic repair well for recycling. Those that do not meet the standard are re-purified with purification materials and then recycled after reaching the standard;

[0079] The cyclic repair well is connected to a nano and / or micro-nano repair liquid disposal and reuse subsystem (collectively referred to as the repair liquid circulation subsystem) for filtering impurities in the repair liquid, adsorbing pollutants, separating solid and liquid, compressing, and dehydrating. The purified repair liquid enters the cyclic repair well for recycling;

[0080] The cyclic repair well is connected to a foam barrier subsystem for preparing barrier foam to form a flexible barrier in the repair space of the cyclic repair well, blocking the migration of pollutants in the soil and groundwater and the overflow and diffusion of the bubble repair liquid.

[0081] The cyclic repair well is connected to a monitoring subsystem in the pollution area for monitoring the soil and groundwater parameters in the repair area of the cyclic repair well, serving as the basis for optimizing and adjusting the entire repair system;

[0082] The cyclic repair well is connected to a control device to adjust the injection amount of nano and micro-nano bubbles according to the monitoring data, realizing intelligent management of the repair process.

[0083] Further, the repair gas includes but is not limited to ozone, oxygen, carbon dioxide, air, etc. to prepare nano and / or micro-nano bubble repair liquid, reducing the dosage of chemicals, reducing secondary pollution, the gas can be recycled, and the raw materials are convenient for construction.

[0084] Further, the cyclic repair well horizontally and vertically transports the bubble repair liquid to the repair range, and the inside of the cyclic repair well is hollow for extracting the repaired bubble repair liquid for recycling.

[0085] Further, the bubble repair liquid generating device includes, but is not limited to, one or more of the following methods: pressurized dissolved air decompression gas release type, pressure dissolved air impeller air dispersion type, swirling liquid flow type, micro pore type, static mixer type, mixed steam direct contact condensation type, ultrasonic cavitation type, and spiral cavitation type.

[0086] Further, the particle size range of the nano bubbles is between 20 - 500 nm, and the particle size range of the micro-nano bubbles is between 100 nm - 100 μm.

[0087] Further, the gas generating device is used for generating gases (such as ozone, oxygen, carbon dioxide, air, etc.) for soil, groundwater, or comprehensive soil and groundwater pollution. The repair liquid is injected into the polluted soil and groundwater area through the circulating repair well by means of a pressurizing device (high-pressure pump), flow meter, and steering valve. The generating device generates repair nano and / or micro-nano bubbles, which are transported through pipelines to the circulating repair well and injected into the polluted area as the repair liquid for pollution repair. The repair and extraction are carried out simultaneously and recycled after treatment. The nano and / or micro-nano bubbles can adsorb the pollutants in the polluted area on their surface or decompose the pollutants through redox reactions, and then the treated water and pollutants are taken out together during the pumping process to achieve the purpose of repair. The repair gas is generated by the bubble generating device as nano and / or micro-nano bubble repair liquid, longitudinally injected into the polluted depth of the soil or groundwater to be repaired through the drilling well of the circulating repair well (including the outer pipe and inner pipe of the well), and laterally injected into the polluted range of the soil or groundwater to be repaired through the drilling branch pipe (circulating repair well branch pipe).

[0088] Further, during the pressurization and extraction of nano and / or micro-nano bubbles, parameters such as pressure and temperature need to be precisely controlled. Minor changes in the parameters may affect the generation quantity, size, and stability of the nano bubbles. The pressurization process can also change the internal pressure and gas concentration of the nano and / or micro-nano bubbles. Appropriate pressurization can make the size of the nano bubbles more uniform, increase the stability of the nano and / or micro-nano bubbles in the liquid, enable gas molecules to fill more tightly inside the bubbles, and at the same time make the charge distribution on the bubble surface more stable.

[0089] Furthermore, the foam generator is used to generate barrier foam. The barrier foam can fill the voids in soil pores to block the migration of soil and groundwater pollutants. Adsorbents and reactive materials are added to the foam. The adsorbents include, but are not limited to, activated carbon, bentonite, etc., which can adsorb heavy metal ions and organic pollutants in soil and groundwater. The reactive substances in the foam can undergo chemical reactions with pollutants. For example, the foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater to convert harmful pollutants into relatively harmless substances. For some organic pollutants, microorganisms or enzymes in the foam can catalyze degradation reactions to decompose the pollutants. Chelating agents are added to the foam material, which can form stable complexes with heavy metal ions to immobilize the heavy metals and prevent their migration.

[0090] Furthermore, adsorbent materials and reactive materials are added to the barrier foam. The barrier foam forms physical barriers on the surface, longitudinally, and at the bottom of the contaminated area to flexibly block the migration of soil and groundwater pollutants and confine the remediation liquid within the remediation area. The adsorbent materials adsorb heavy metal ions and organic pollutants in soil and groundwater, and the reactive materials can undergo chemical reactions with pollutants to complete the chemical remediation process. Microorganisms or enzymes can catalyze degradation reactions to decompose pollutants.

[0091] Furthermore, the foam barrier subsystem connected to the circulating remediation well prepares barrier foam and injects it into the voids in soil pores underground. The barrier foam is sprayed on the ground surface and injected longitudinally and at the bottom to form a three-dimensional spatial barrier. Adsorbent materials, reactive materials, microorganisms, or enzymes are added to the foam material to repair heavy metal ions and organic pollutants in the contaminated area. Adsorbent materials such as activated carbon, bentonite, etc., can adsorb heavy metal ions and organic pollutants in soil and groundwater. The reactive materials can undergo chemical reactions with pollutants to complete the chemical remediation process. The foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater to convert harmful pollutants into relatively harmless substances. Adding microorganisms or enzymes can catalyze degradation reactions to decompose pollutants.

[0092] Furthermore, the foam barrier subsystem is used to generate barrier foam that can fill the voids in soil pores, forming a flexible physical barrier to block the migration of pollutants in soil and groundwater. The foam generator, i.e., the foam generator, generates foam barriers that can be used for surface barriers, longitudinal barriers, and bottom barriers of the polluted area. The range of barriers and the spraying thickness can be selected according to needs to comprehensively block pollution and prevent the overflow of the repair liquid. Adsorbents and reactive materials are added to the foam. Adsorbents such as activated carbon and bentonite can adsorb heavy metal ions and organic pollutants in soil and groundwater, and the reactive substances in the foam can chemically react with pollutants to complete the chemical repair process. Foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater, converting harmful pollutants into relatively harmless substances. Microorganisms or enzymes in the foam can catalyze degradation reactions to decompose organic pollutants. The foam barrier confines the repair liquid within the repair area, reducing the repair cost and preventing secondary pollution.

[0093] Furthermore, the cyclic repair well repairs settlement. The outer pipe of the cyclic repair well injects the repair liquid into the repair area, and the repair liquid settles naturally. The cyclic repair well is hollow and connected to a cyclic extraction device, then enters the separation and recovery repair liquid treatment device, and then is connected to the bubble repair liquid generating device, and then connected to the cyclic repair well, and the repair is in a closed cycle.

[0094] Furthermore, nano- and / or micro-nano bubbles are used in the field of soil, groundwater, or comprehensive soil and groundwater pollution remediation for efficient, fast, and non-secondary-pollution in-situ remediation. During the remediation process, the repair liquid is detected and treated, and the repair materials are recycled and used continuously. Pipeline circulation is used to recover, separate, and recycle the repair liquid; the adsorption material adsorbs the dissolved pollutants in the repair liquid; the filtering material separates solids and liquids, and the repair liquid is recycled after passing the detection; the cycle consists of repair liquid preparation, pressurization, injection, remediation, extraction, treatment, detection, separation, reuse, and is cycled in turn; the detection device (including the first repair liquid detection device and the second repair liquid detection device) is used to detect the pollution concentration, bubble content, and particle size in the repair liquid to determine whether it meets the standards for reuse. If it meets the requirements, it is reused; if it does not meet the requirements, additional bubbles are added for cyclic use; the repair liquid disposal and reuse subsystem is used to filter and adsorb pollutants in the repair liquid, and the filtering system is used to separate solids and liquids and compress and dehydrate solid waste. The bubble repair liquid is connected to the pressurization device and the cyclic repair well in sequence and enters the polluted area for remediation. The adsorption device is used to adsorb pollutants in the repair liquid, and the adsorption material regeneration device (except for the relevant devices in the repair liquid circulation subsystem of the cyclic repair well) is used to remove and desorb the pollutants in the adsorption material.

[0095] Further, the detection device (including the first repair fluid detection device and the second repair fluid detection device) detects the content of pollutants and bubbles in the repair fluid. After the repair fluid enters the separation and treatment device and meets the reuse standard, it re-enters the bubble generation device for recycling.

[0096] Further, the repair fluid treatment device includes, but is not limited to, a filtering device, such as filtering with a filter screen, a filter membrane, etc.; using the centrifugal force generated by a centrifuge to separate components with different densities in the repair fluid; adding a precipitant to the repair fluid to precipitate some of the pollutants; for heavy metal leaching solutions, such as adding sodium sulfide (Na2S), heavy metal ions (such as mercury, cadmium, lead, etc.) can form sulfide precipitates. Using an adsorbent to adsorb pollutants in the repair fluid; using chemical treatment methods such as redox reactions and neutralization reactions to remove pollution; dehydrating and drying the solid impurities after filtration for centralized resource utilization.

[0097] Further, the contaminated area includes contaminated soil and / or contaminated groundwater, and the contaminated soil is distributed above the contaminated groundwater.

[0098] Further, the nano- and / or micro-nano bubble repair fluid generation device is connected to a circulating repair well and is used to generate nano- and / or micro-nano bubble repair fluid. The bubble repair fluid generation device adopts a gas-liquid mixing technology and can fully mix gas (such as oxygen, ozone, etc.) and water to form stable nano- and / or micro-nano bubbles. Its main structure includes a gas source supply unit, a water source supply unit, and a mixing unit. The gas source supply unit (the gas source can come from a gas generation device) can select a suitable gas according to the type of pollution. Ozone can be selected for organic pollution, and oxygen can be selected for heavy metal pollution, etc.; the water source supply unit can use a groundwater extraction device, an external water source, and recycling of the repair fluid to meet the needs of different sites; the mixing unit realizes efficient mixing of gas and liquid through a mixing structure and process to generate nano- and / or micro-nano bubble water.

[0099] Further, during the pressurization (through a pressurization device) and extraction process (through a circulating extraction device) of nano- and / or micro-nano bubbles, parameters such as pressure and temperature are precisely controlled to control the generation quantity, size, and stability of nano-bubbles. The pressurization process changes the internal pressure and gas concentration of nano- and / or micro-nano bubbles. Appropriate pressurization makes the size of nano-bubbles more uniform, increases the stability of nano- and / or micro-nano bubbles in the liquid, gas molecules are more closely packed inside the bubbles, and the charge distribution on the bubble surface is more stable.

[0100] Further, the circulating repair system consists of repair fluid preparation, pressurization, injection, repair, extraction, treatment, detection, separation, reuse, and circulates in sequence. The adsorption material adsorbs dissolved pollutants in the repair fluid, the filtering material separates solids and liquids, and the repair fluid is recycled after passing the detection, while the solid impurities are compressed, dehydrated, collected, and treated.

[0101] Further, the detection devices (the first repair liquid detection device, the second repair liquid detection device) and the subsystems of solid waste disposal (the circulating extraction device, the repair liquid treatment device, the purification material recycling device, the solid waste resource utilization device, the gas purification device) operate in coordination and cross-operation in the circulating repair system. The detection device is used to detect whether the pollution concentration, bubble content, and particle size in the repair liquid meet the standards for reuse. If they meet the requirements, they are reused; if not, bubbles are supplemented and recycled.

[0102] Further, the solid waste resource utilization device is used to filter and adsorb pollutants from the repair liquid, and to separate solid and liquid, and compress and dehydrate solid waste. The bubble repair liquid is sequentially connected to the pressurization device, the injection device (circulating repair well), and the repair device (repair liquid treatment device) and enters the polluted area for repair. The adsorption device is used to adsorb pollutants in the repair liquid, and the adsorption material regeneration device is used to remove and desorb the pollutants in the adsorption material.

[0103] Further, the foam barrier subsystem is used to generate barrier foam. The foam can fill the voids in the soil pores, form a physical barrier, flexibly block the migration of pollutants in the soil and groundwater, limit the repair liquid within the repair range area, reduce the repair cost, and prevent secondary pollution.

[0104] Further, adsorption materials and reactive materials are added to the barrier foam. Adsorption materials such as activated carbon and bentonite can adsorb heavy metal ions and organic pollutants in the soil and groundwater, and the reactive materials in the foam can undergo chemical reactions with pollutants to complete the chemical repair process. Foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater to convert harmful pollutants into relatively harmless substances. For organic pollutants, adding microorganisms or enzymes to the foam can catalyze the degradation reaction and decompose the pollutants.

[0105] Further, the gas purification device is used to purify and recycle the gases emitted after repair and the recycled gases, reduce production costs, and reduce resource waste and environmental pollution. Solid particles, liquid droplets, other harmful or unwanted gas components, etc. are removed by methods such as adsorption, filtration, absorption, and membrane separation. The circulation system includes gas conveying equipment (such as fans, compressors, etc.), pipelines, valves, and gas treatment units (such as purification, heating, or cooling units).

[0106] Compared with the prior art, the present invention has the following beneficial effects:

[0107] 1) A nano- and / or micro-nano bubble in-situ cyclic remediation system for contaminated soil and / or groundwater provided by this technical solution can achieve nano- and / or micro-nano bubble remediation, recycling, in-situ barrier, and in-situ remediation of contaminated soil and / or groundwater through the characteristics of nano- and / or micro-nano bubbles. It has the advantages of low disturbance, low risk of secondary pollution, and safe and green remediation, and is applicable to in-situ remediation of contaminated soil, groundwater, or areas contaminated by both soil and groundwater. Using bubble remediation can reduce the dosage of chemicals and secondary pollution.

[0108] 2) A nano- and / or micro-nano bubble in-situ cyclic remediation system for contaminated soil and / or groundwater provided by this technical solution also has the function of emergency remediation. In the event of a sudden environmental pollution incident, the remediation system can be quickly deployed to the polluted site. Barrier foam is injected and sprayed to prevent the migration and diffusion of pollutants. The diffusion rate of nano- and / or micro-nano bubbles is fast and the reaction activity is high, which can effectively control and degrade pollutants in a short time, reduce the pollution level, prevent the further diffusion of pollutants, and gain time for subsequent thorough remediation.

[0109] 3) A nano- and / or micro-nano bubble in-situ cyclic remediation system for contaminated soil and / or groundwater provided by this technical solution can remediate the polluted area without demolishing buildings.

[0110] 4) The application of a nano- and / or micro-nano bubble in-situ cyclic remediation system for contaminated soil and / or groundwater provided by this technical solution can remediate heavy metals, organic substances, or comprehensive heavy metal and organic pollutants separately during the remediation process. While reducing the remediation cost, it also reduces the usage amount of the remediation liquid. Each unit can be independently applied to small-scale polluted areas or can be combined and coordinated with other units for remediation in large-scale areas, which is flexible, convenient, precise, and controllable. In the remediation of soil, groundwater, or areas contaminated by both soil and groundwater, nano- and / or micro-nano bubble remediation liquid is injected into the polluted area for pollution remediation. The depth and spacing of the multi-functional remediation wells are designed according to the geological conditions and pollution degree of the polluted area to ensure that nano- and / or micro-nano bubble water can evenly diffuse throughout the polluted area. The remediation liquid forms a vertical and horizontal cross-network through the cyclic remediation wells, and comprehensive three-dimensional cyclic remediation is carried out while extracting water from the bottom. Nano- and / or micro-nano bubbles can adsorb pollutants in the polluted area on their surface or decompose pollutants through redox reactions, and then the treated water and pollutants are taken out together during the pumping process to achieve the purpose of remediation.

[0111] 5) The application of a nano- and / or micro-nano bubble in-situ cyclic remediation system for contaminated soil and / or groundwater provided by this technical solution has the characteristics of dynamics, persistence, controllability, closure, and stability.

[0112] 6) The in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles provided by this technical solution uses a foam generator to conduct all-round pollution barrier in the surface, horizontal, and vertical directions of the contaminated area, isolate the remediation liquid, and replace the rigid barrier with a flexible barrier to prevent rigid fracture or damage of the barrier surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] Figure 1 It is a schematic diagram of the in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles in the embodiments of the present invention.

[0114] Figure 2 It is a side schematic diagram of the in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles in the embodiments of the present invention.

[0115] Figure 3 It is a top view schematic diagram of the in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles in the embodiments of the present invention.

[0116] Reference numerals in the figures:

[0117] 1. Gas generation device; 2. Bubble remediation liquid generation device; 3. Pressurization device; 4. Remediation liquid remediation; 5. Barrier foam; 6. Cyclic remediation well; 601. Well head; 602. Sedimentation pipe; 603. Porous structure; 604. Branch pipe connection; 605. Cyclic remediation well branch pipe; 606. Link rod; 607. Outer well pipe; 608. Inner well pipe; 609. Well partition; 610. Branch well tip; 611. Well top port; 7. Contaminated area; 8. Settlement; 9. Cyclic extraction device; 10. First remediation liquid detection device; 11. Remediation liquid treatment device; 12. Second remediation liquid detection device; 13. Recycling; 14. Solid waste resource utilization device; 15. Gas purification device; 16. Gas collection and reuse; 17. Foam generator; 18. First separated solid; 19. Separated gas. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0118] The present invention will be described in detail below with reference to the drawings and specific embodiments. Features such as component models, material names, connection structures, control methods, algorithms, etc. that are not clearly described in this technical solution are regarded as common technical features disclosed in the prior art.

[0119] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0120] It should be noted that in the present invention, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0121] The following further elaborates on the content of the present invention in conjunction with specific embodiments.

[0122] Embodiment 1

[0123] As Figure 1 shown, this embodiment provides an in-situ cyclic remediation system for contaminated soil and / or groundwater. The cyclic remediation system includes a cyclic remediation well 6, a bubble remediation liquid generation subsystem, a remediation liquid circulation subsystem, and a foam barrier subsystem;

[0124] The cyclic remediation well 6 is connected to the contaminated area 7, and the cyclic remediation well 6 is arranged within the contaminated area 7;

[0125] The bubble remediation liquid generation subsystem is connected to the cyclic remediation well 6;

[0126] The remediation liquid circulation subsystem is connected to the cyclic remediation well 6;

[0127] The bubble remediation liquid generation subsystem is connected to the remediation liquid circulation subsystem;

[0128] The bubble remediation liquid generation subsystem is used to generate nano- and / or micro-nano bubbles through the remediation liquid and gas to adsorb and degrade pollutants in the contaminated area 7 of the soil and / or groundwater;

[0129] The remediation liquid circulation subsystem is used to purify the bubble remediation liquid and recycle it;

[0130] The foam barrier subsystem is connected to the contaminated area 7, and the foam barrier subsystem is used to generate foam in the contaminated area 7 of the soil and / or groundwater to form a contaminated foam barrier layer.

[0131] The bubble remediation liquid generation subsystem includes a gas generation device 1, a bubble remediation liquid generation device 2, and a pressurization device 3;

[0132] The gas generation device 1 is connected to the bubble repair liquid generation device 2;

[0133] The pressurization device 3 is connected to the bubble repair liquid generation device 2. The pressurization device 3 is connected to the circulation repair well 6. The pressurization device 3 is used to send the bubble repair liquid generated by the bubble repair liquid generation device 2 into the contaminated area 7 through the circulation repair well 6.

[0134] The repair liquid circulation subsystem includes a circulation extraction device 9, a first repair liquid detection device 10, a repair liquid treatment device 11, a second repair liquid detection device 12, a purification material recycling device 17, a solid waste resource utilization device 14, and a gas purification device 15;

[0135] The circulation extraction device 9 is connected to the circulation repair well 6. The circulation extraction device 9 extracts the bubble repair liquid through the circulation repair well 6. The circulation extraction device 9 is used to extract the repaired bubble repair liquid from the circulation repair well 6 and send it to the first repair liquid detection device 10;

[0136] The first repair liquid detection device 10 is connected to the circulation extraction device 9, and the first repair liquid detection device 10 is connected to the repair liquid treatment device 11;

[0137] The repair liquid treatment device 11 is connected to the second repair liquid detection device 12, the repair liquid treatment device 11 is connected to the purification material recycling device 17, the repair liquid treatment device 11 is connected to the solid waste resource utilization device 14, and the repair liquid treatment device 11 is connected to the gas purification device 15;

[0138] The gas purification device 15 is connected to the bubble repair liquid generation device 2 and the solid waste resource utilization device 14. The gas purification device 15 is used to purify and recycle the gas emitted after repair, that is, the separated gas 19 (gas collection and recycling 16), reduce production costs, reduce resource waste and environmental pollution;

[0139] The repair fluid treatment device 11 is used to separate the repair fluid, pollutants, and solid impurities, and obtain the first separated solid 18, separated gas 19, and purification material. The first separated solid 18 enters the solid waste resource utilization device 14 for recycling. The purification material is reused through the purification material reuse device 17, and the reused purification material returns to the repair fluid treatment device 11. The solid impurities are dehydrated and dried after filtration in the purification material reuse device 17 and enter the solid waste resource utilization device 14 for centralized resource utilization. The separated gas 19 enters the gas purification device 15 for gas purification, and the obtained purified gas enters the bubble repair fluid generating device 2 for gas collection and reuse 16. The obtained second separated solid enters the solid waste resource utilization device 14 for recycling, and the obtained separated liquid enters the repair fluid treatment device 11 for recycling and reuse.

[0140] The foam barrier subsystem includes a foam generator 17 and a barrier foam 5;

[0141] The foam generator 17 is connected to the contaminated soil, and the foam generator 17 is used to generate the barrier foam 5 and inject the barrier foam 5 into the contaminated area 7.

[0142] The outlet of the repair fluid treatment device 11 and the inlet of the purification material reuse device 17 in the circulating repair system are connected by a pipeline. The inlet of the repair fluid treatment device 11 and the outlet of the purification material reuse device 17 in the circulating repair system are connected by a pipeline, forming a repair fluid purification material regeneration loop for repeatedly using the purification material to purify the bubble repair fluid.

[0143] The bubble repair fluid generating device 2, pressurizing device 3, circulating repair well 6, circulating extraction device 9, first repair fluid detection device 10, repair fluid treatment device 11, and second repair fluid detection device 12 in the circulating repair system are sequentially connected by pipelines. The second repair fluid detection device 12 and the bubble repair fluid generating device 2 are connected by a pipeline, forming a repair fluid detection circulation loop for detecting whether the bubble repair fluid meets the standards. The qualified repair fluid is recycled, and the unqualified repair fluid is recycled after being re-purified with the purification material.

[0144] The outlet of the repair fluid treatment device 11 and the inlet of the gas purification device 15 in the circulating repair system are connected by a pipeline. The inlet of the repair fluid treatment device 11 and the outlet of the gas purification device 15 in the circulating repair system are connected by a pipeline, forming a repair fluid disposal and reuse pipeline for repeatedly using the purification material to purify the bubble repair fluid.

[0145] The repair fluid treatment device 11 is used for the purification and recycling of the repair fluid, and the gas purification device 15 is used for the purification and recycling of the post-repair and escaped gas into the bubble repair fluid generating device 2.

[0146] The first repair fluid detection device 10 is used to detect the pollution concentration and the nano- and / or micro-nano bubble content after the bubble repair fluid completes the repair, and the second repair fluid detection device 12 is used to detect whether the bubble repair fluid meets the requirements for recycling after purification treatment, and to detect whether the pollutant concentration in the repair fluid meets the requirements for recycling.

[0147] The repair fluid is injected horizontally and vertically into the polluted area 7 by the multi-functional repair well (i.e., the circulating repair well 6), and the repair fluid is extracted from the bottom to form a full-space repair mode. After post-treatment such as extraction treatment, the repair fluid enters the bubble repair fluid generating device 2 for recycling.

[0148] The circulating repair well 6 includes:

[0149] An inner well pipe 608, which is arranged at the rear end of the circulating repair well 6;

[0150] An outer well pipe 607, which is sleeved outside the inner well pipe 608;

[0151] A well head 601, which is arranged at the front end of the circulating repair well 6;

[0152] A porous structure 603, which is arranged between the well head 601 and the inner well pipe 608;

[0153] A circulating repair well branch pipe 605, which is connected to the outer well pipe 607. The outer well pipe 607 injects the bubble repair fluid into the soil or groundwater polluted area 7 through the circulating repair well branch pipe 605;

[0154] A branch pipe connection 604, which connects the circulating repair well branch pipe 605 and the outer well pipe 607. The branch pipe connection 604 is used to connect the circulating repair well branch pipe 605 and the outer well pipe 607 to introduce the bubble repair fluid, and to adjust the position and angle of the circulating repair well branch pipe 605 according to the change of the repair depth.

[0155] The well head 601 is wedge-shaped and is used to insert into the polluted soil and / or groundwater area.

[0156] The circulating repair well 6 further includes:

[0157] A sedimentation pipe 602, which is arranged at the lower end of the well head 601;

[0158] A connecting rod 606, which is connected to the sedimentation pipe 602. The connecting rod 606 is used to extract the sedimentation pipe 602 to remove the sediment;

[0159] A well partition 609, which is used to isolate the repair fluid injection area and the repair fluid recovery area;

[0160] A well partition 609 is provided between the in-well pipe 608 and the porous structure 603, and a well partition 609 is provided between the well head 601 and the porous structure 603.

[0161] The circulating repair well 6 further includes:

[0162] A branch well tip 610, which is connected to the circulating repair well branch pipe 605. The branch well tip 610 is provided at the end of the circulating repair well branch pipe 605 and is used to assist the well circulating repair well branch pipe 605 to enter different repair areas;

[0163] A well top port 611, which is provided at the rear end of the outer well pipe 607 and the in-well pipe 608. The well top port 611 is used to assist in lifting the circulating repair well 6.

[0164] The end of the circulating repair well branch pipe 605 is rotatably connected to the outer well pipe 607 through a branch pipe link 604;

[0165] Multiple groups of circulating repair well branch pipes 605 are provided along the axial direction of the outer well pipe 607;

[0166] Multiple circulating repair well branch pipes 605 in each group of circulating repair well branch pipes 605 are evenly distributed along the circumferential direction of the outer well pipe 607;

[0167] The branch pipe link 604 includes a link hose. The two ends of the link hose are respectively connected to the circulating repair well branch pipe 605 and the outer well pipe 607. The link hose communicates the circulating repair well branch pipe 605 and the outer well pipe 607 to introduce the bubble repair liquid in the outer well pipe 607 into the circulating repair well branch pipe 605.

[0168] The outer well pipe 607 of the circulating repair well 6 is connected to the circulating repair well branch pipe 605. When being pressed into the repair area, after the circulating repair well branch pipe 605 is brought together and closely attached to the outer well pipe 607 through the branch pipe link 604 and inserted into the polluted area 7, the circulating repair well drives the circulating repair well branch pipe 605 to horizontally insert into the repair area during the upward movement process;

[0169] A well top port 611 is provided at the upper end of the circulating repair well. By lifting the well top port 611 of the circulating repair well, the whole circulating repair well moves upward;

[0170] During the upward movement of the circulating repair well, the branch well tip 610 of the circulating repair well branch pipe 605 drives the circulating repair well branch pipe 605 to horizontally expand.

[0171] Multiple circulating repair wells are combined or used separately according to the scope of the polluted area 7. The multi-functional circulating repair well main pipe (including the outer well pipe 607 and the in-well pipe 608) and its branch pipes (circulating repair well branch pipes 605) horizontally expand to form a longitudinal and transverse spatial three-dimensional repair area network.

[0172] The outlets of the outer well pipe 607 of the cyclic remediation well 6, the outlets of the branch pipes 605 of the cyclic remediation well, and the top of the cyclic remediation well are of a porous structure, which is basically the same as the porous structure 603 and is used for the circulation of the remediation liquid and groundwater. The outer well pipe 607 and the branch pipes 605 of the cyclic remediation well disperse the remediation liquid into the remediation area. The porous filtration at the top of the cyclic remediation well is used to prevent solid impurities in the extracted remediation liquid from entering the circulation system.

[0173] The cyclic remediation well is divided into an inner well pipe and an outer well pipe. The outer well pipe is used to inject the remediation liquid into the contaminated area 7. The inner well pipe extracts the remediation liquid through suction filtration at the bottom of the wellhead. After the remediation liquid remediates the contaminated soil and / or groundwater, the remediation liquid is recycled after extraction treatment. The branch pipes of the cyclic remediation well are hinged to the outer pipe. When the remediation well is drilled downward into the soil, the branch pipes are drilled into the soil in the same direction as the drilling. When the well is lifted, the branch pipes are horizontally unfolded for horizontal injection of the remediation liquid. The outer well pipe injects the remediation liquid longitudinally. The branch pipes of the cyclic remediation well are connected to the outer well pipe through branch pipe connections (hinges). When the cyclic remediation well is drilled downward into the soil, the branch pipes of the cyclic remediation well are drilled into the soil in the same direction as the drilling. When the branch pipes of the cyclic remediation well are lifted, the branch pipes of the cyclic remediation well are horizontally unfolded for horizontal injection of the remediation liquid. The outer well pipe injects the remediation liquid longitudinally. The porous filtration of the cyclic remediation well is used to prevent solid impurities in the extracted remediation liquid from entering the circulation.

[0174] The cyclic remediation well 6 is drilled to the remediation depth. The main pipes (including the outer well pipe 607 and the inner well pipe 608) are vertically inserted into the remediation area for longitudinal remediation, and the branch pipes (the branch pipes 605 of the cyclic remediation well) are horizontally unfolded for horizontal remediation. A three-dimensional cyclic remediation system is formed by extraction at the bottom of the remediation well. The cyclic remediation well is divided into an outer well pipe 607 and an inner well pipe 608. The outer well pipe 607 is used to inject the remediation liquid into the contaminated area 7. The inner well pipe 608 extracts the remediation liquid through suction filtration at the bottom of the wellhead (the well head 601). After the remediation liquid remediates the soil and groundwater, the remediation liquid is recycled through bubble generation after extraction treatment.

[0175] The remediation liquid enters the contaminated area 7 through the main pipes (including the outer well pipe 607 and the inner well pipe 608) and the branch pipes (the branch pipes 605 of the cyclic remediation well) of the cyclic remediation well, and the remediation liquid is carried out from top to bottom under the action of gravity;

[0176] A porous structure 603 is provided at the upper end of the well head 601 for the extraction device to extract and recycle the remediation liquid. The porous structure 603 is used to filter large particle impurities;

[0177] A sedimentation pipe 602 is provided at the bottom end of the cyclic remediation well for collecting accumulated fine particle impurities. The sedimentation pipe 602 is connected through a connecting rod 606 to remove the sediment in the well;

[0178] A partition (well partition 609) is provided in the remediation well to isolate the remediation liquid injection area and the remediation liquid recovery area to prevent the mixing of the remediation liquid.

[0179] The described cyclic remediation system can remediate heavy metals, organic substances, or combined heavy metal and organic pollutants simultaneously or separately, reducing the remediation cost and the amount of remediation liquid used. Each unit can be independently applied to small-scale contaminated areas 7 or can be combined with other units for large-scale remediation.

[0180] The cyclic remediation well 6 is directly drilled to the remediation depth. The main pipe (including the outer pipe 607 and the inner pipe 608 outside the well) is vertically inserted into the remediation area for longitudinal remediation, and the branch pipe (the branch pipe 605 of the cyclic remediation well) is horizontally extended for horizontal remediation. Bottom extraction forms a comprehensive three-dimensional cyclic remediation.

[0181] In this embodiment, the contaminated area 7 includes contaminated soil and contaminated groundwater. The contaminated soil is distributed above the contaminated groundwater, and the cyclic remediation well 6 is inserted into the contaminated soil and the contaminated groundwater.

[0182] Use the in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles for the remediation of contaminated areas 7 of soil and / or groundwater.

[0183] The cyclic remediation well is connected to nano- and / or micro-nano bubble remediation liquid purification materials and gas purification materials, and the purification materials are regenerated and reused in a cycle;

[0184] The cyclic remediation well is connected to the detection cycle circuit of nano- and / or micro-nano bubble remediation liquid and remediation gas. After the detection meets the standard, the remediation liquid and the remediation gas enter the cyclic remediation well for recycling. Those that do not meet the standard are re-purified by the purification materials and then recycled after meeting the standard;

[0185] The cyclic remediation well is connected to a nano- and / or micro-nano remediation liquid disposal and reuse subsystem (collectively referred to as the remediation liquid circulation subsystem) for filtering impurities in the remediation liquid, adsorbing pollutants, separating solid and liquid, compressing, and dehydrating. The purified remediation liquid enters the cyclic remediation well for recycling;

[0186] The cyclic remediation well is connected to a foam barrier subsystem for preparing a barrier foam to form a flexible barrier in the remediation space of the cyclic remediation well, blocking the migration of pollutants in the soil and groundwater and the overflow and diffusion of the bubble remediation liquid.

[0187] The remediation gas includes, but is not limited to, ozone, oxygen, carbon dioxide, air, etc. for preparing nano- and / or micro-nano bubble remediation liquid, reducing the amount of chemical agents used, reducing secondary pollution, and the gas can be recycled, and the raw materials are convenient for construction.

[0188] The cyclic remediation well 6 horizontally and vertically transports the bubble remediation liquid to the remediation range. The inside of the cyclic remediation well 6 is hollow for extracting the recycled bubble remediation liquid after remediation.

[0189] The bubble repair liquid generating device 2 includes, but is not limited to, one or more of the following methods: pressurized dissolved air decompression gas release type, pressure dissolved air impeller gas dispersion type, swirling liquid flow type, microporous type, static mixer type, mixed steam direct contact condensation type, ultrasonic cavitation type, and spiral cavitation type.

[0190] The particle size range of nano-bubbles is between 20 - 500 nm, and the particle size range of micro-nano bubbles is between 100 nm - 100 μm.

[0191] The gas generating device 1 is used to generate gases (such as ozone, oxygen, carbon dioxide, air, etc.) for soil, groundwater, or comprehensive soil and groundwater pollution. The repair liquid is injected into the polluted soil and groundwater area through the circulation repair well 6 by the pressurizing device 3 (high-pressure pump), flow meter, and steering valve. The generating device generates repair nano- and / or micro-nano bubbles, which are transported through pipelines to the circulation repair well and injected into the polluted area 7 as a repair liquid for pollution repair. The repair and extraction are carried out simultaneously and recycled after treatment. The nano- and / or micro-nano bubbles can adsorb the pollutants in the polluted area 7 on their surface or decompose the pollutants through redox reactions, and then the treated water and pollutants are taken out together with the pumping process to achieve the purpose of repair. The repair gas is generated by the bubble generating device as nano- and / or micro-nano bubble repair liquid, longitudinally injected into the polluted depth of the soil or groundwater to be repaired through the drilling well of the circulation repair well (including the outer pipe 607 and the inner pipe 608 of the well), and laterally injected into the polluted range of the soil or groundwater to be repaired through the drilling branch pipe (the circulation repair well branch pipe 605).

[0192] During the pressurization and extraction of nano- and / or micro-nano bubbles, parameters such as pressure and temperature need to be precisely controlled. Minor changes in the parameters may affect the generation quantity, size, and stability of nano-bubbles. The pressurization process can also change the internal pressure and gas concentration of nano- and / or micro-nano bubbles. Appropriate pressurization can make the size of nano-bubbles more uniform, increase the stability of nano- and / or micro-nano bubbles in the liquid, enable gas molecules to be more closely packed inside the bubbles, and at the same time make the charge distribution on the bubble surface more stable.

[0193] The foam generator 17 is used to generate the barrier foam 5. The barrier foam 5 can fill the voids in the soil pores, block the migration of soil and groundwater pollutants. Adsorbents and reactive materials are added to the foam. The adsorbents include, but are not limited to, activated carbon, bentonite, etc., which can adsorb heavy metal ions and organic pollutants in soil and groundwater. The reactive substances in the foam can undergo chemical reactions with pollutants. For example, the foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater, converting harmful pollutants into relatively harmless substances. For some organic pollutants, microorganisms or enzymes in the foam can catalyze the degradation reaction to decompose the pollutants. Chelating agents are added to the foam material, and this chelating agent can form stable complexes with heavy metal ions, thereby fixing the heavy metals and preventing their migration.

[0194] Adsorbent materials and reactive materials are added to the barrier foam 5. The barrier foam forms physical barriers on the surface, longitudinally, and at the bottom of the contaminated area 7, flexibly blocking the migration of soil and groundwater pollutants and restricting the remediation liquid within the remediation range area. The adsorbent material adsorbs heavy metal ions and organic pollutants in soil and groundwater, and the reactive material can undergo chemical reactions with pollutants to complete the chemical remediation process. Microorganisms or enzymes can catalyze the degradation reaction to decompose pollutants.

[0195] The foam barrier subsystem connected to the circulation remediation well 6 prepares the barrier foam and injects it into the voids in the soil pores underground. The barrier foam is sprayed on the ground surface and injected longitudinally and at the bottom to form a three-dimensional spatial barrier. Adsorbent materials, reactive materials, microorganisms, or enzymes are added to the foam material to repair heavy metal ions and organic pollutants in the contaminated area 7. Adsorbent materials such as activated carbon, bentonite, etc., can adsorb heavy metal ions and organic pollutants in soil and groundwater. The reactive material can undergo chemical reactions with pollutants to complete the chemical remediation process. The foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater, converting harmful pollutants into relatively harmless substances. Adding microorganisms or enzymes can catalyze the degradation reaction to decompose pollutants.

[0196] The foam barrier subsystem is used to generate barrier foam that can fill the voids in soil pores, forming a flexible physical barrier to block the migration of pollutants in soil and groundwater. The foam generator 17, i.e., the foam generator, generates foam barriers that can be used for surface barriers, longitudinal barriers, and bottom barriers of the pollution range. The range of barriers and the spraying thickness can be selected according to needs to comprehensively block pollution and prevent the overflow of the repair liquid. Adsorbents and reactive materials are added to the foam. Adsorbents such as activated carbon and bentonite can adsorb heavy metal ions and organic pollutants in soil and groundwater, and the reactive substances in the foam can chemically react with pollutants to complete the chemical repair process. Foam containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater, converting harmful pollutants into relatively harmless substances. Microorganisms or enzymes in the foam can catalyze degradation reactions to decompose organic pollutants. The foam barrier confines the repair liquid within the repair area, reducing the repair cost and preventing secondary pollution.

[0197] The circulating repair well 6 repairs the settlement 8. The outer pipe 607 of the circulating repair well 6 injects the repair liquid into the repair area, and the repair liquid naturally settles 8. The circulating repair well 6 is hollow and connected to the circulating extraction device 9, enters the separation and recovery repair liquid treatment device 11, then is connected to the bubble repair liquid generating device 2, and then is connected to the circulating repair well 6, and the repair is in a closed cycle.

[0198] Nano and / or micro-nano bubbles are used in the field of soil, groundwater, or comprehensive soil and groundwater pollution remediation for efficient, fast, and non-secondary pollution in-situ remediation. During the remediation process, the repair liquid is detected and treated, and the repair materials are recycled and continuously used. Pipeline circulation is used to recover, separate, and recycle the repair liquid; the adsorption material adsorbs the dissolved pollutants in the repair liquid; the filter material separates solids and liquids, and the repair liquid is recycled after passing the detection; the cycle consists of repair liquid preparation, pressurization, injection, repair, extraction, treatment, detection, separation, and reuse 13, and is cycled in sequence; the detection device (including the first repair liquid detection device 10 and the second repair liquid detection device 12) is used to detect the pollution concentration, bubble content, and particle size in the repair liquid to determine whether it meets the standards for reuse 13. If it meets the requirements, it is reused 13, and if it does not meet the requirements, additional bubbles are added for cyclic use; the repair liquid disposal and reuse subsystem is used to filter and adsorb pollutants in the repair liquid, and the filtration system is used to separate solids and liquids and compress and dehydrate solid waste. The bubble repair liquid is connected to the pressurization device and the circulating repair well 6 in sequence and enters the pollution area 7 for repair. The adsorption device is used to adsorb pollutants in the repair liquid, and the adsorption material regeneration device (except for the relevant devices in the repair liquid circulation subsystem of the circulating repair well 6) is used to remove and desorb the pollutants in the adsorption material.

[0199] The detection device (including the first repair fluid detection device 10 and the second repair fluid detection device 12) detects the content of pollutants and bubbles in the repair fluid. After the repair fluid enters the separation and treatment device, it meets the reuse standard and re-enters the bubble generation device for recycling.

[0200] The repair fluid treatment device 11 includes, but is not limited to, a filtration device, such as filtration with a filter screen, a filter membrane, etc.; using the centrifugal force generated by a centrifuge to separate components of different densities in the repair fluid; adding a precipitant to the repair fluid to precipitate some of the pollutants; for heavy metal leaching solutions, such as adding sodium sulfide (Na2S), heavy metal ions (such as mercury, cadmium, lead, etc.) can form sulfide precipitates. Using an adsorbent to adsorb pollutants in the repair fluid; using chemical treatment methods such as redox reactions and neutralization reactions to remove pollutants; dehydrating and drying the solid impurities after filtration for centralized resource utilization.

[0201] The contaminated area 7 includes contaminated soil and / or contaminated groundwater, and the contaminated soil is distributed above the contaminated groundwater.

[0202] The nano- and / or micro-nano bubble repair fluid generation device 2 is connected to the circulation repair well 6 and is used to generate nano- and / or micro-nano bubble repair fluid. The bubble repair fluid generation device 2 adopts a gas-liquid mixing technology, which can fully mix gas (such as oxygen, ozone, etc.) and water to form stable nano- and / or micro-nano bubbles. Its main structure includes a gas source supply unit, a water source supply unit, and a mixing unit. The gas source supply unit (the gas source can come from the gas generation device 1) can select appropriate gases according to the type of pollution. Ozone can be selected for organic pollution, and oxygen can be selected for heavy metal pollution, etc.; the water source supply unit can use a groundwater extraction device, an external water source, and the recycling of the repair fluid to meet the needs of different sites; the mixing unit realizes the efficient mixing of gas and liquid through a mixing structure and process to generate nano- and / or micro-nano bubble water.

[0203] Precisely control parameters such as pressure and temperature during the pressurization (through the pressurization device 3) and extraction process (through the circulation extraction device 9) of nano- and / or micro-nano bubbles to control the generation quantity, size, and stability of nano-bubbles. The pressurization process changes the internal pressure and gas concentration of nano- and / or micro-nano bubbles. Appropriate pressurization makes the size of nano-bubbles more uniform, increases the stability of nano- and / or micro-nano bubbles in the liquid, gas molecules are more closely packed inside the bubbles, and the charge distribution on the bubble surface is more stable.

[0204] The circulation repair system consists of repair fluid preparation, pressurization, injection, repair, extraction, treatment, detection, separation, and reuse 13, and is cycled in sequence. The adsorption material adsorbs dissolved pollutants in the repair fluid, the filtration material separates solids and liquids, and after the repair fluid is detected to be qualified, it is recycled, and the solid impurities are compressed, dehydrated, collected, and treated.

[0205] The detection devices (the first repair liquid detection device 10 and the second repair liquid detection device 12) and the subsystems of solid waste disposal (the circulating extraction device 9, the repair liquid treatment device 11, the purification material recycling device 17, the solid waste resource utilization device 14, the gas purification device 15) operate in coordination and cross-operation in the circulating repair system. The detection devices are used to detect whether the pollution concentration, bubble content, and particle size in the repair liquid meet the standards for reuse 13. If the requirements are met, it is reused 13; if not, bubbles are supplemented for recycling.

[0206] The solid waste resource utilization device 14 is used to filter and adsorb pollutants in the repair liquid, and is used for separating solid and liquid, compressing and dewatering solid waste. The bubble repair liquid is connected to the pressurizing device 3, the injection device (circulating repair well 6), and the repair device (repair liquid treatment device 11) in sequence and enters the pollution area 7 for repair. The adsorption device is used to adsorb pollutants in the repair liquid, and the adsorption material regeneration device is used to remove and desorb the pollutants in the adsorption material.

[0207] The foam barrier subsystem is used to generate barrier foams. The foams can fill the voids in the soil pores, form a physical barrier, flexibly block the migration of pollutants in the soil and groundwater, limit the repair liquid within the repair range area, reduce the repair cost, and prevent secondary pollution.

[0208] Adsorbing materials and reactive materials are added to the barrier foam 5. Adsorbing materials such as activated carbon and bentonite can adsorb heavy metal ions and organic pollutants in the soil and groundwater, and the reactive materials in the foam can undergo chemical reactions with pollutants to complete the chemical repair process. Foams containing oxidation reagents can undergo redox reactions with reducing pollutants such as sulfides in groundwater to convert harmful pollutants into relatively harmless substances. For organic pollutants, adding microorganisms or enzymes to the foam can catalyze the degradation reaction to decompose pollutants.

[0209] The gas purification device 15 is used to purify and recycle the gases emitted after repair and the recycled gases, reduce production costs, reduce resource waste and environmental pollution. Solid particles, liquid droplets, other harmful or unwanted gas components, etc. are removed by methods such as adsorption, filtration, absorption, and membrane separation. The circulation system includes gas conveying equipment (such as fans, compressors, etc.), pipelines, valves, and gas treatment units (such as purification, heating or cooling units).

[0210] Example 2

[0211] On the basis of Example 1, this example further includes the following settings:

[0212] The circulating repair system further includes a monitoring subsystem in the pollution area 7;

[0213] The monitoring subsystem within the polluted area 7 is installed inside the polluted area 7 and is used to monitor the parameters of soil and / or groundwater in real time during the remediation process. The data obtained through the monitoring system provides a basis for the optimization and adjustment of the cyclic remediation system. The monitoring subsystem within the polluted area 7 includes: multi-parameter soil sensors: which can integrate monitoring modules for moisture, temperature, conductivity, pH, nitrogen, phosphorus, potassium, etc.; tube-type automatic soil moisture monitoring instrument: which uses highly sensitive sensors to automatically sense changes in soil moisture content, temperature, etc.; on-line soil organic matter detection sensor: which uses technologies such as near-infrared spectroscopy, conductivity method, Fourier transform infrared spectroscopy, impedance spectroscopy, etc. to measure the content of organic matter in soil in real time and continuously; groundwater quality monitor (multi-parameter water quality monitor): which can be connected to multiple parameter sensors at the same time and can continuously detect indicators such as pH, conductivity, dissolved oxygen, turbidity, temperature, water level, etc. of water quality, as well as items such as ORP, residual chlorine, COD, ammonia nitrogen, suspended solids, microorganisms, etc.

[0214] The monitoring subsystem within the polluted area 7 includes monitoring wells, which are set at different positions according to the engineering needs.

[0215] The parameters include pollutant concentration, pH value, redox potential, etc.

[0216] The layout of the monitoring wells comprehensively reflects the remediation effect of the polluted area 7, and the data obtained through monitoring provides a basis for the optimization and adjustment of the remediation system.

[0217] The cyclic remediation system further includes a control device;

[0218] The control device is connected to the bubble remediation liquid generating device 2 of the bubble remediation liquid generating subsystem;

[0219] The control device is connected to the monitoring wells of the monitoring subsystem within the polluted area 7;

[0220] The control device is used to automatically adjust the working state of the bubble remediation liquid generating device 2 of the bubble remediation liquid generating subsystem, such as the gas-liquid mixing ratio, bubble generation frequency, etc., according to the parameter information fed back by the monitoring wells of the monitoring subsystem within the polluted area 7, so as to achieve precise remediation. The control device has functions of data storage, analysis and remote transmission, which is convenient for users to master the remediation progress and effect at any time and realize the intelligent management of the remediation process.

[0221] The cyclic remediation system further includes a power supply device; the power supply device is connected to the bubble remediation liquid generating device 2 of the bubble remediation liquid generating subsystem to provide stable power support for it. The power supply device can adopt a solar power supply device, which converts solar energy into electrical energy using solar panels, or can also adopt a storage battery to ensure the normal operation of the power supply device and the bubble remediation liquid generating device 2 of the bubble remediation liquid generating subsystem under different working conditions.

[0222] The monitoring subsystem connected to the cyclic remediation well in the contaminated area 7 is used to monitor the soil and groundwater parameters in the remediation area of the cyclic remediation well, serving as the basis for optimizing and adjusting the entire remediation system;

[0223] The connection control device of the cyclic remediation well adjusts the injection volume of nano and micro-nano bubbles according to the monitoring data, realizing the intelligent management of the remediation process.

[0224] Types of core control devices, including but not limited to programmable logic controllers (PLCs) for the automatic control of soil and / or groundwater remediation systems, such as adjusting the start-stop and operating parameters of equipment like pumps, valves, and agitators. Distributed control systems (DCS) for cyclic remediation systems (such as multi-region linked groundwater remediation projects), realizing centralized monitoring and management of cross-region equipment. Human-machine interfaces (HMIs) and monitoring software, which are the interaction interfaces between operators and the remediation system. Intelligence and automation: Combining artificial intelligence (AI) algorithms, such as predicting the diffusion trend of pollutants through machine learning and automatically optimizing remediation parameters (such as chemical agent ratio, cycle period).

[0225] Embodiment 3

[0226] As Figures 2 to 3 shown, based on Embodiment 1 or Embodiment 2, this embodiment further includes the following settings:

[0227] The cyclic remediation well 6 includes a well head 601, a sedimentation pipe 602, a porous structure 603, a branch pipe connection 604, a cyclic remediation well branch pipe 605, a connecting rod 606, an outer well pipe 607, an inner well pipe 608, a well partition 609, a branch well tip 610, and a well top port 611.

[0228] The inner well pipe 608 is arranged at the rear end of the cyclic remediation well 6;

[0229] The outer well pipe 607 is sleeved outside the inner well pipe 608;

[0230] The well head 601 is arranged at the front end (bottom) of the cyclic remediation well 6; the well head 601 is wedge-shaped and is used to insert into the contaminated soil and / or groundwater area;

[0231] The porous structure 603 is arranged between the well head 601 and the inner well pipe 608;

[0232] The cyclic remediation well branch pipe 605 is connected to the outer well pipe 607, and the outer well pipe 607 injects the bubble remediation liquid into the soil or groundwater contaminated area 7 through the cyclic remediation well branch pipe 605;

[0233] The branch pipe connection 604 connects the branch pipe 605 of the circulating repair well with the outer well pipe 607. The branch pipe connection 604 is used to connect the branch pipe 605 of the circulating repair well with the outer well pipe 607 to introduce the bubble repair fluid, and to adjust the position and angle of the branch pipe 605 of the circulating repair well as the repair depth changes;

[0234] The sedimentation pipe 602 is arranged at the lower end of the well head 601;

[0235] The connecting rod 606 is connected to the sedimentation pipe 602. The connecting rod 606 is used to extract the sedimentation pipe 602 to remove the sediment;

[0236] The well partition 609 is used to isolate the repair fluid injection area and the repair fluid recovery area. The outer well pipe 607 is similar to a sandwich casing. The bubble repair fluid is inside the casing, and the inner pipe is for pumping groundwater. The well partition 609 is a partition layer that physically separates the bottom of the casing from the porous structure 603. The bubble repair fluid is above the partition layer, and the porous structure 603 is below the partition layer, which is used to pump groundwater and the used repair fluid;

[0237] A well partition 609 is provided between the inner well pipe 608 and the porous structure 603, and a well partition 609 is provided between the well head 601 and the porous structure 603;

[0238] The branch pipe well tip 610 is connected to the branch pipe 605 of the circulating repair well. The branch pipe well tip 610 is arranged at the end of the branch pipe 605 of the circulating repair well, and is used to assist the branch pipe 605 of the circulating repair well to enter different repair areas;

[0239] The well top port 611 is arranged at the rear ends of the outer well pipe 607 and the inner well pipe 608. The well top port 611 is used to assist in lifting the circulating repair well 6. The outer well pipe 607 of the circulating repair well 6 is connected to the branch pipe 605 of the circulating repair well. When the branch pipe 605 of the circulating repair well is pressed into the repair area, the branch pipe 605 of the circulating repair well is brought together and tightly attached to the outer well pipe 607 through the branch pipe connection 604 and inserted into the contaminated area 7. During the upward movement of the circulating repair well, the branch pipe 605 of the circulating repair well is horizontally inserted into the repair area;

[0240] The well top port 611 is arranged at the upper end of the circulating repair well. By lifting the well top port 611 of the circulating repair well, the entire circulating repair well moves upward;

[0241] During the upward movement of the circulating repair well, the branch pipe well tip 610 of the branch pipe 605 of the circulating repair well drives the branch pipe 605 of the circulating repair well to horizontally expand.

[0242] The circulating extraction device 9 is connected to the circulating repair well 6. The circulating extraction device 9 extracts the bubble repair fluid through the porous structure 603 of the circulating repair well 6. The circulating extraction device 9 is used to extract the repaired bubble repair fluid from the inner well pipe 608 of the circulating repair well 6 and then send it to the first repair fluid detection device 10.

[0243] Multiple circulating repair wells are combined or used separately according to the scope of the polluted area 7. The multi-functional main pipe of the circulating repair well (including the outer well pipe 607 and the inner well pipe 608) and its branch pipes (the branch pipes 605 of the circulating repair well) are horizontally unfolded to form a longitudinal and transverse spatial three-dimensional repair area network.

[0244] The end of the branch pipe 605 of the circulating repair well is rotatably connected to the outer well pipe 607 through the branch pipe connection 604;

[0245] Multiple groups of branch pipes 605 of the circulating repair well are arranged along the axial direction of the outer well pipe 607;

[0246] Multiple branch pipes 605 in each group of branch pipes 605 of the circulating repair well are evenly distributed along the circumferential direction of the outer well pipe 607;

[0247] The branch pipe connection 604 includes a connecting hose. The two ends of the connecting hose are respectively connected to the branch pipe 605 of the circulating repair well and the outer well pipe 607. The connecting hose connects the branch pipe 605 of the circulating repair well and the outer well pipe 607 to introduce the bubble repair liquid in the outer well pipe 607 into the branch pipe 605 of the circulating repair well.

[0248] Both the branch pipe 605 of the circulating repair well and the outer well pipe 607 include an inner hose and an outer hard pipe (the outer part is a hard connection for support, and the inner part is a hose connection for the liquid passage). The branch pipe connection 604 includes a connecting hose and a hinge seat. The inner hose is connected and communicated with the connecting hose in the branch pipe connection 604. The outer hard pipe of the branch pipe 605 of the circulating repair well is hinged to the hinge seat, and the hinge seat is fixedly connected to the outer well pipe 607.

[0249] The outlet of the outer well pipe 607 of the circulating repair well 6, the outlet of the branch pipe 605 of the circulating repair well, and the top of the circulating repair well are porous structures. The outer well pipe 607 and the branch pipe 605 of the circulating repair well disperse the repair liquid into the repair area. The porous filter at the top of the circulating repair well is used to prevent solid impurities in the extracted repair liquid from entering the circulation system.

[0250] The circulating repair well 6 drills to the repair depth. The main pipe (including the outer well pipe 607 and the inner well pipe 608) is vertically inserted into the repair area for longitudinal repair, and the branch pipe (the branch pipe 605 of the circulating repair well) is horizontally unfolded for horizontal repair. The bottom of the repair well extracts to form a spatial three-dimensional circulation repair system. The circulating repair well is divided into the outer well pipe 607 and the inner well pipe 608. The outer well pipe 607 is used to inject the repair liquid into the polluted area 7, and the inner well pipe 608 extracts and filters the repair liquid through the bottom of the wellhead (the well head 601). After the repair liquid repairs the soil and groundwater, the repair liquid is recycled through bubble generation after extraction treatment.

[0251] The repair fluid enters the contaminated area 7 through the main pipe of the circulating repair well (including the outer well pipe 607 and the inner well pipe 608) and the branch pipe (the branch pipe 605 of the circulating repair well), and the repair fluid is repaired from top to bottom under the action of gravity;

[0252] A porous structure 603 is provided at the upper end of the well head 601 for the extraction device to extract and recycle the repair fluid, and the porous structure 603 is used to filter large particle impurities;

[0253] A sedimentation pipe 602 is provided at the bottom end of the circulating repair well for collecting accumulated fine particle impurities, and the sedimentation pipe 602 is connected by a connecting rod 606 to remove the sediment in the well;

[0254] A partition (well partition 609) is provided in the repair well to isolate the repair fluid injection area and the repair fluid recovery area to prevent the mixing of the repair fluid.

[0255] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. An in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles, characterized in that, The described cyclic remediation system includes a cyclic remediation well (6), a bubble remediation liquid generation subsystem, a remediation liquid circulation subsystem, and a foam barrier subsystem; The cyclic remediation well (6) is connected to the contaminated area (7), and the cyclic remediation well (6) is disposed within the contaminated area (7); The bubble remediation liquid generation subsystem is connected to the cyclic remediation well (6); The remediation liquid circulation subsystem is connected to the cyclic remediation well (6); The bubble remediation liquid generation subsystem is connected to the remediation liquid circulation subsystem; The bubble remediation liquid generation subsystem is used to generate nano- and / or micro-nano bubbles through the remediation liquid and gas to adsorb and degrade pollutants in the soil and / or groundwater contaminated area (7); The remediation liquid circulation subsystem is used to purify the bubble remediation liquid and recycle it; The foam barrier subsystem is connected to the contaminated area (7), and the foam barrier subsystem is used to generate foam in the soil and / or groundwater contaminated area (7) to form a contaminated foam barrier layer.

2. The in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles according to claim 1, characterized in that The bubble remediation liquid generation subsystem includes a gas generation device (1), a bubble remediation liquid generation device (2), and a pressurization device (3); The gas generation device (1) is connected to the bubble remediation liquid generation device (2); The pressurization device (3) is connected to the bubble remediation liquid generation device (2), the pressurization device (3) is connected to the cyclic remediation well (6), and the pressurization device (3) is used to send the bubble remediation liquid generated by the bubble remediation liquid generation device (2) into the contaminated area (7) through the cyclic remediation well (6).

3. The in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles according to claim 1, characterized in that, The remediation liquid circulation subsystem includes a cyclic extraction device (9), a first remediation liquid detection device (10), a remediation liquid treatment device (11), a second remediation liquid detection device (12), a purification material recycling device (17), a solid waste resource utilization device (14), and a gas purification device (15); The cyclic extraction device (9) is connected to the cyclic remediation well (6), and the cyclic extraction device (9) extracts the bubble remediation liquid through the cyclic remediation well (6). The cyclic extraction device (9) is used to extract the remediated bubble remediation liquid from the cyclic remediation well (6) and send it to the first remediation liquid detection device (10); The first remediation liquid detection device (10) is connected to the cyclic extraction device (9), and the first remediation liquid detection device (10) is connected to the remediation liquid treatment device (11); The remediation liquid treatment device (11) is connected to the second remediation liquid detection device (12), the remediation liquid treatment device (11) is connected to the purification material recycling device (17), the remediation liquid treatment device (11) is connected to the solid waste resource utilization device (14), and the remediation liquid treatment device (11) is connected to the gas purification device (15); The gas purification device (15) is connected to the bubble remediation liquid generation device (2), and the gas purification device (15) is connected to the solid waste resource utilization device (14); The repair fluid treatment device (11) is used to separate the repair fluid, pollutants, and solid impurities, and obtain the first separated solid (18), separated gas (19), and purification material. The first separated solid (18) enters the solid waste resource utilization device (14) for recycling. The purification material is reused through the purification material reuse device (17), and the reused purification material returns to the repair fluid treatment device (11). The solid impurities are dehydrated and dried after filtration in the purification material reuse device (17) and enter the solid waste resource utilization device (14) for centralized resource utilization. The separated gas (19) enters the gas purification device (15) for gas purification, and the obtained purified gas enters the bubble repair fluid generation device (2) for gas collection and reuse (16). The obtained second separated solid enters the solid waste resource utilization device (14) for recycling, and the obtained separated liquid enters the repair fluid treatment device (11) for recycling.

4. A in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles, as claimed in claim 1, wherein The foam barrier subsystem includes a foam generator (17) and barrier foam (5); The foam generator (17) is connected to the contaminated soil, and the foam generator (17) is used to generate barrier foam (5) and inject the barrier foam (5) into the contaminated area (7).

5. A in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles, according to claim 1, characterized in that The cyclic repair system further includes a monitoring subsystem within the contaminated area (7); The monitoring subsystem within the contaminated area (7) is disposed within the contaminated area (7) and is used to monitor the parameters of the soil and / or groundwater during the repair process in real time; The monitoring subsystem within the contaminated area (7) includes monitoring wells; The parameters include pollutant concentration, pH value, and redox potential.

6. The in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles according to claim 5, characterized in that The cyclic repair system further includes a control device; The control device is connected to the bubble repair fluid generation subsystem; The control device is connected to the monitoring subsystem within the contaminated area (7); The control device is used to automatically adjust the working state of the bubble repair fluid generation subsystem according to the parameter information fed back by the monitoring subsystem within the contaminated area (7).

7. A in-situ cyclic remediation system for contaminated soil and / or groundwater by air bubbles, characterized in that, The cyclic repair well (6) includes: An inner well pipe (608), and the inner well pipe (608) is disposed at the rear end of the cyclic repair well (6); An outer well pipe (607), and the outer well pipe (607) is sleeved outside the inner well pipe (608); A well head (601), and the well head (601) is disposed at the front end of the cyclic repair well (6); A porous structure (603), and the porous structure (603) is disposed between the well head (601) and the inner well pipe (608); A cyclic repair well branch pipe (605), and the cyclic repair well branch pipe (605) is connected to the outer well pipe (607). The outer well pipe (607) injects the bubble repair fluid into the soil or groundwater contaminated area (7) through the cyclic repair well branch pipe (605); A branch pipe connection (604), and the branch pipe connection (604) connects the cyclic repair well branch pipe (605) and the outer well pipe (607). The branch pipe connection (604) is used to communicate the cyclic repair well branch pipe (605) and the outer well pipe (607) to introduce the bubble repair fluid, and adjust the position and angle of the cyclic repair well branch pipe (605) according to the change in the repair depth.

8. A in-situ cyclic remediation system for contaminated soil and / or groundwater by air bubbles, characterized in that, The cyclic repair well (6) further includes: Sedimentation pipe (602), the sedimentation pipe (602) is provided at the lower end of the well head (601); Link rod (606), the link rod (606) is connected to the sedimentation pipe (602), and the link rod (606) is used to extract the sedimentation pipe (602) for removing sediments; Well partition (609), the well partition (609) is used to isolate the injection area of the repair fluid and the recovery area of the repair fluid; A well partition (609) is provided between the inner well pipe (608) and the porous structure (603), and a well partition (609) is provided between the well head (601) and the porous structure (603).

9. A in-situ cyclic remediation system for contaminated soil and / or groundwater by bubbles, characterized in that, The in-situ cyclic remediation well (6) further includes: Branch well tip (610), the branch well tip (610) is connected to the in-situ cyclic remediation well branch pipe (605), and the branch well tip (610) is provided at the end of the in-situ cyclic remediation well branch pipe (605) for assisting the in-situ cyclic remediation well branch pipe (605) to enter different remediation areas; Well top port (611), the well top port (611) is provided at the rear ends of the outer well pipe (607) and the inner well pipe (608), and the well top port (611) is used to assist in lifting the in-situ cyclic remediation well (6).

10. Use of an in-situ cyclic remediation system for contaminated soil and / or groundwater bubbles according to any one of claims 1-9, characterized in that The contaminated soil and / or groundwater bubble in-situ cyclic remediation system is used for the remediation of contaminated areas (7) of soil and / or groundwater.

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