A method for in-situ remediation of groundwater

Abstract

The present invention discloses a method for in-situ remediation of groundwater, comprising the steps of moving a mobile carrier to a target location, drilling a remediation well at the target location, and preparing a reagent, delivering the reagent, and the like. The equipment structure adopted in this method is simple, and the mobile carrier can be used to move and transport the contaminated location for in-situ remediation. There is no need to build large-scale special equipment or factory buildings, and the land area requirement is low. In-situ remediation can be achieved, and the site remediation project can be completed quickly and flexibly. A diffuser is provided, and a reagent channel and a mixing channel are provided in the diffuser, so that the underground contaminated water layer has fluidity in a certain direction, which can effectively improve the diffusion efficiency of the reagent. The reagent can be mixed with water in the reagent channel to improve the solubility of the reagent. The outlet position of the reagent channel and the inlet position of the mixing channel are respectively provided with a filter layer, and a vibration plate is provided to shake off some particles adhering to the filter layer to prevent the filter layer from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater remediation, and in particular to a groundwater in-situ remediation method. Background Art

[0002] Groundwater is a precious freshwater resource for humanity. However, with the continuous advancement of industrialization, wastewater discharge, industrial waste, agricultural irrigation, landfill leaks, and damage to petrochemical pipelines and storage tanks can all contribute to groundwater contamination, exacerbating the already severe water shortage. This poses serious threats and challenges to human health, food safety, drinking water safety, regional ecological environments, sustainable economic and social development, and even social stability. Groundwater remediation has become a highly publicized and socially recognized environmental issue. Groundwater remediation involves restoring contaminated groundwater to its original quality through extraction, gas lift, bioremediation, and permeable reaction walls.

[0003] A common existing groundwater remediation method is ozone (O3) oxidation. However, this method is ineffective in treating contaminated groundwater and soil due to its selectivity for oxidizing organic matter, insufficient adaptability to pollutants, and the reaction products sometimes cause secondary pollution. Furthermore, existing ozone oxidation methods rely on extraction, requiring groundwater to be pumped up to a designated location for remediation. This is time-consuming and labor-intensive, requiring the construction of fixed sites and equipment, resulting in high investment and difficulty in relocation after use. Summary of the Invention

[0004] The technical problem solved by the present invention is that the existing extraction ozone oxidation method is selective in oxidizing organic matter and has insufficient adaptability to pollutants, and the reaction products sometimes cause secondary pollution, resulting in poor groundwater remediation effect; and the groundwater needs to be pumped up to a designated location for remediation treatment, which is time-consuming and labor-intensive. At the same time, it requires the construction of fixed sites and equipment, which requires high investment and is difficult to relocate after use.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for in-situ remediation of groundwater, comprising the following steps:

[0007] S1: Moving a mobile carrier carrying an ozone generation system, a hydrogen peroxide delivery system, a reagent dispensing system, and an automatic control system to a target location; drilling a remediation well at the target location, wherein the depth of the remediation well matches the depth of the contaminated groundwater layer to be treated; then inserting a delivery pipe for delivering ozone and hydrogen peroxide into the remediation well to the depth of the contaminated water layer in the remediation well, with the hydrogen peroxide outlet positioned above the ozone outlet, and a partition layer disposed between the outlets;

[0008] S2: Preparation of reagents:

[0009] S21: The air compression storage system works, sucking in ambient air from the outside, compressing it dryly, and then passing it through a cartridge filter to remove dust and suspended particles in the air. After the filtration is complete, the clean air is stored in the air storage tank;

[0010] S22: Part of the air in the air storage tank is transported to the PSA oxygen generator to generate oxygen. The generated oxygen is sampled and tested and then stored in the oxygen storage tank after passing the test.

[0011] S23: The oxygen in the oxygen storage tank is sent to the ozone generation system through the gas filter and the functional valve group to generate ozone;

[0012] S3: Ozone and hydrogen peroxide are pressurized and transported to the remediation well. After the chemicals are transported to the remediation well, they diffuse into the contaminated water layer through the diffuser at the end of the transport pipe. The hydrogen peroxide outlet is located at the top. After being discharged under the action of gravity, the hydrogen peroxide liquid flows downward and diffuses outward. The ozone outlet is located at the bottom. After being discharged, the ozone gas floats upward and diffuses outward. The two chemicals converge in the contaminated layer and fully react. The highly oxidizing properties of the hydroxyl free radicals generated during the reaction are used to degrade various pollutants in the soil and groundwater.

[0013] S4: After the repair is completed, the corresponding equipment is collected.

[0014] As a further solution of the present invention: a medicine channel and a mixing channel are opened in the diffuser, and the mixing channel is communicated with the medicine channel.

[0015] As a further solution of the present invention: a filter layer is respectively provided at the outlet position of the medicine channel and the inlet position of the mixing channel.

[0016] As a further solution of the present invention: a vibration plate is provided in the medicine channel, and the vibration plate is connected to the diffuser via an elastic member.

[0017] As a further solution of the present invention: a bracket is rotatably provided on the outside of the diffuser, and a plurality of rotating plates are fixedly provided on the bracket.

[0018] As a further solution of the present invention: the diffuser is cylindrical, and one end of the rotating plate is in contact with the outer cylindrical surface of the diffuser.

[0019] As a further solution of the present invention, a plurality of guide grooves are provided on a side surface at the front end when the rotating plate rotates.

[0020] A groundwater in-situ remediation method according to the present invention has at least one of the following technical effects:

[0021] The equipment used in this method has a simple structure and can be transported to the contaminated site via a mobile carrier for in-situ remediation. It does not require the construction of large-scale specialized equipment or workshops, and has low land requirements. It can achieve in-situ remediation and quickly and flexibly complete site remediation projects.

[0022] Various hydrocarbon organics, polycyclic aromatic hydrocarbons, chlorinated organic compounds and other pollutants are converted in situ into water, carbon dioxide, inorganic salts and other benign substances that are harmless to the soil; the high dissolved oxygen produced by the advanced oxidation process can continue to act and strengthen the bioremediation process; it can also be well combined with other soil treatment technologies (such as gas phase extraction technology) to form a comprehensive treatment system;

[0023] A diffuser is provided, and a drug channel and a mixing channel are opened in the diffuser, so that the underground contaminated water layer has a certain direction of fluidity, which can effectively improve the diffusion efficiency of the drug. The drug can also be mixed with water in the drug channel, improving the solubility of the drug;

[0024] The outlet of the medicine channel and the inlet of the mixing channel are respectively provided with a filter layer and a vibration plate, which can shake off some particles adhering to the filter layer to prevent the filter layer from being blocked;

[0025] The bracket is driven to rotate slowly by the power component, which in turn drives the rotating plate to rotate, so that the mud and sand around the diffuser can be discharged within a certain cylindrical space, reducing the possibility of the diffuser outlet being blocked. At the same time, it can make the groundwater dynamic to increase the diffusion efficiency of the agent and the convection between the remediated contaminated water and the unremediated contaminated water, thereby improving the remediation efficiency.

[0026] The delivery pipe and the drilling probe are set up, so that the soil can be distributed on the outside of the delivery pipe during the downward drilling process, which can effectively prevent the mutual diffusion of different groundwater contaminated water layers; the sealing structure with two annular convex peak structures is set up to effectively ensure the sealing effect and avoid the leakage of the agent.

[0027] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0029] Figure 1 It is a schematic diagram of the planar structure of the mobile carrier of the present invention;

[0030] Figure 2 It is a schematic diagram of the process flow of the present invention;

[0031] Figure 3It is a schematic flow chart of the air compression storage system of the present invention;

[0032] Figure 4 It is a schematic flow chart of the oxygen generating system of the present invention;

[0033] Figure 5 It is a schematic flow chart of the ozone generating system of the present invention;

[0034] Figure 6 It is a schematic flow chart of the hydrogen peroxide delivery system of the present invention;

[0035] Figure 7 is a schematic flow chart of the drug dispensing system of the present invention;

[0036] Figure 8 It is a structural schematic diagram of the repair well of the present invention;

[0037] Figure 9 1 is a structural schematic diagram of an embodiment of a diffuser of the present invention;

[0038] Figure 10 1 is a structural schematic diagram of another embodiment of the diffuser of the present invention;

[0039] Figure 11 Schematic diagram of the connection structure of the vibration plate of the present invention;

[0040] Figure 12 It is a schematic structural diagram of the side view of the bracket of the present invention;

[0041] Figure 13 It is a structural schematic diagram of the rotating plate of the present invention;

[0042] Figure 14 It is a structural schematic diagram of the guide groove of the present invention.

[0043] In the picture:

[0044] 10. Mobile carrier; 20. Air compression storage system; 30. Oxygen generation system; 40. Diffuser; 50. Ozone generation system; 60. Contaminated water layer; 70. Remediation well;

[0045] 400, medicine channel; 401, mixing channel; 402, vibration plate; 403, bracket; 404, rotating plate; 405, guide groove. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0048] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0049] See also Figure 1-14 As shown, the present invention is a method for in-situ remediation of groundwater, comprising the following steps:

[0050] S1: The mobile carrier 10 carrying the ozone generation system 50, hydrogen peroxide delivery system, agent dispensing system, and automatic control system is moved to the target location; a remediation well 70 is drilled at the target location, the depth of which matches the depth of the contaminated groundwater layer to be treated; a delivery pipe for delivering ozone and hydrogen peroxide to the remediation well 70 is then placed into the remediation well 70 at the depth of the contaminated water layer 60, with the hydrogen peroxide outlet located above the ozone outlet, and a separation layer provided between the two outlets; the separation layer may be formed by filling the remediation well 70 with bentonite, or may be a separation structure sleeved on the delivery pipe;

[0051] S2: Preparation of reagents:

[0052] S21: The air compression storage system 20 works, sucking in ambient air from the outside, drying and compressing it, and then passing it through a cartridge filter to remove dust and suspended particles in the air. After the filtration is completed, the clean air is stored in the air storage tank;

[0053] S22: Part of the air in the air storage tank is transported to the PSA oxygen generator to generate oxygen. The generated oxygen is sampled and tested and then stored in the oxygen storage tank after passing the test.

[0054] S23: The oxygen in the oxygen storage tank is sent to the ozone generation system 50 after passing through the gas filter and the functional valve group to generate ozone;

[0055] S3: Ozone and hydrogen peroxide are pressurized and transported to the remediation well 70. After being transported to the remediation well 70, the reagents diffuse into the contaminated water layer 60 through the diffuser 40 at the end of the transport pipe. The hydrogen peroxide outlet is located at the top. After being discharged under the action of gravity, the hydrogen peroxide liquid flows downward and diffuses outward. The ozone outlet is located at the bottom. After being discharged, the ozone gas floats upward and diffuses outward. The two chemical substances converge in the contaminated layer and fully react. The highly oxidizing properties of the hydroxyl free radicals generated during the reaction are used to degrade various pollutants in the soil and groundwater.

[0056] S4: After the repair is completed, the corresponding equipment, such as the delivery pipe, diffuser 40, etc., is retrieved.

[0057] See also Figure 1 In one embodiment of the present invention, the mobile carrier 10 is used as a carrier for the equipment; the mobile carrier 10 is a mobile vehicle structure (such as a portable two-wheel trailer) or a container structure. The mobile carrier 10 can be divided into an air compression room and an ozone generation room. The air compression storage system 20 and the oxygen generation system 30 are located in the air compression room, and the hydrogen peroxide delivery system, the ozone generation system 50, the drug distribution system, and the automatic control system are located in the ozone generation room. The corresponding equipment is connected by pipes and valve groups. Pipes and discharge welding equipment are laid on the walls of the carriage, and an aisle is formed in the middle for operators to use. In addition to the above main equipment parts, ventilation fans and air intake shutters are distributed on the upper and lower sides of the air compression room to speed up air circulation; the power distribution box of the ozone generation room is connected to 380V, 50Hz three-phase AC power.

[0058] See also Figure 3 In one embodiment of the present invention, an air compression storage system 20 is disposed on a mobile carrier 10 and is used to filter and dry ambient air to obtain dry, clean air. The air compression storage system 20 includes a drying and compression box, a cartridge filter, an air storage tank, and a connecting piping structure. The drying and compression box dries and compresses ambient air, then passes it through the cartridge filter to remove dust and suspended particles. After filtration, the clean air is stored in the air storage tank, which then provides dry, clean air to the PSA oxygen generator and the air distribution system through the air storage tank branch pipe. The cartridge filter can be a double-layer cartridge filter.

[0059] See also Figure 4In one embodiment of the present invention, an oxygen generation system 30 is installed on the mobile carrier 10 to generate oxygen. The oxygen generation system 30 is connected to an air storage tank via a pipeline. The oxygen generation system 30 may include a PSA oxygen concentrator and an oxygen storage tank. The air distribution system transports clean air from the air storage tank through a pipeline to the PSA oxygen concentrator to generate high-purity oxygen. After sampling and testing, the oxygen is stored in the oxygen storage tank. Excess nitrogen from the PSA oxygen concentrator's production process and oxygen discharged from the safety valve can be centrally processed and discharged into the atmosphere.

[0060] See also Figure 5-6 In one embodiment of the present invention, an ozone generation system 50 is mounted on a mobile carrier 10 to generate ozone. The input of the ozone generation system 50 is connected to an oxygen storage tank via a pipeline, and the output of the ozone generation system 50 is connected to a reagent distribution system. High-purity oxygen from the oxygen storage tank is fed into the ozone generation system 50 after passing through a gas filter and a functional valve assembly. Because ozone is unstable, easily decomposed, and unsuitable for storage, newly generated ozone is directly fed into the distribution system and injected into the well. The ozone generator can control the ozone generation process and pressure using a combination of digital input and output and analog electrical signal input and output. The hydrogen peroxide delivery system includes a hydrogen peroxide storage tank, a peristaltic pump, and a control valve assembly. The hydrogen peroxide is delivered to the reagent distribution system via the peristaltic pump and then injected into the well.

[0061] See also Figure 7 In one embodiment of the present invention, the chemical distribution system is used to distribute and deliver clean air, oxygen, ozone, and hydrogen peroxide. The chemical distribution system receives chemicals from the aforementioned systems and controls solenoid valves via a PLC system to inject chemicals into the wells. A single group of wellbores requires air, ozone, and hydrogen peroxide injection pipes. The chemical distribution system's main control unit includes three one-way valves and three automatic valves; each well also requires three PLC automatic valves. The automatic control system is connected to the chemical distribution system. Each module utilizes a highly automated, accurate, and safe PLC (Process Logic Controller) control system to control the opening and closing of the solenoid valves, with centralized control from a central control panel.

[0062] See also Figure 8In one embodiment of the present invention, when repairing the groundwater contaminated water layer 60, the mobile carrier 10 is first moved to the target position; then the reagent is prepared, and a repair well 70 is formed at the target treatment position. The delivery pipe and the diffuser 40 are drilled to a specified depth. The depth of the repair well 70 needs to match the depth of the underground contaminated water layer 60. A hydrogen peroxide diffuser 40 and an ozone diffuser 40 form a group. Multiple groups can be set up during groundwater repair, corresponding to contaminated water layers 60 of different depths; the air compression storage system 20 works, sucking in ambient air from the outside for drying and compression, and then passing it into a cartridge filter to remove dust, suspended particles, etc. in the air. After the filtration is completed, the clean air is stored in the air storage tank; part of the air in the air storage tank is transported to the PSA oxygen generator to form oxygen, and the generated oxygen is stored in the oxygen storage tank after being sampled and tested; oxygen The oxygen in the storage tank is sent to the ozone generation system 50 after passing through a gas filter and a functional valve group to generate ozone; the output pipeline of the reagent distribution system is sealed and connected to the corresponding reagent channel 400; the pressurized ozone and clean air mixture and hydrogen peroxide are respectively transported to the groundwater layer through the reagent distribution system and the reagent channel 400 through the corresponding reagent channel 400 for remediation reaction, wherein the discharge outlet of hydrogen peroxide in the groundwater layer is located above the discharge outlet of ozone in the groundwater layer; ozone and hydrogen peroxide are injected into the contaminated water layer 60 through the transmission pipe, and the hydrogen peroxide discharge outlet is set at the top. After being discharged under the action of gravity, the liquid flows downward and diffuses outward. The ozone discharge outlet is set at the bottom. After being discharged, the ozone gas floats upward and diffuses outward. After being pressurized, the ozone is mixed with high-pressure clean air and injected into the remediation well 70. The air can promote the diffusion of ozone underground. The two chemicals converge in the contaminated layer and react fully. The highly oxidizing properties of the hydroxyl radicals (OH·) generated during the reaction degrade various pollutants in the soil and groundwater. Due to the high oxidizing properties of (OH·), various hydrocarbon organic compounds, polycyclic aromatic hydrocarbons, and chlorinated organic compounds can be degraded almost non-selectively into water, carbon dioxide, and inorganic salts. After remediation is complete, the equipment is recovered. This device can be applied in a wide range of fields, including groundwater chemical oxidation, in-situ groundwater chemical oxidation remediation, soil chemical oxidation, in-situ soil chemical oxidation remediation, saturated layer remediation, and vadose zone remediation.

[0063] Part of the mechanism of the device's ozone and hydrogen peroxide reaction to repair groundwater pollution is as follows:

[0064] In this reaction system, H2O2 dissociates to produce (superoxide ion) significantly increases the rate of free radical generation. Therefore, the reaction between H2O2 and ozone can be considered as the reaction between ozone molecules and OH - Reaction generation And it is caused by the partial dissociation of H2O2. The reaction principle is as follows:

[0065]

[0066]

[0067] The above reaction generates It is an inducer of free radical (OH·) production.

[0068]

[0069] When free radicals (OH·) are generated, a series of chain reactions occur in the reaction system, ultimately decomposing ozone (O3) into oxygen (O2). In addition to the above reactions, there is also a reaction between hydrogen peroxide and (OH·) free radicals.

[0070]

[0071] In actual working environments, there is an optimal molar ratio of hydrogen peroxide to ozone. Under this molar ratio, the reaction of hydrogen peroxide and ozone can eliminate pollutants to the greatest extent possible. The ideal molar ratio of hydrogen peroxide to ozone is greater than 0 and less than 0.4-0.45.

[0072] The target pollutants that this device can treat are as follows:

[0073] (1) Double bond compounds, such as PCE, TCE, DCE and vinyl chloride;

[0074] (2) Petroleum hydrocarbon compounds, gasoline, diesel, fuel oil, tar, etc.;

[0075] (3) Chlorinated solvents, PCE, TCE, VC, DCE, 1,4-dioxane);

[0076] (4) Aromatics, PAHs, phenols, chlorobenzene, wood tar alcohol;

[0077] (5) Others: cyanide, PCB, explosives, dioxins, pesticides, etc.

[0078] See also Figure 8-10 In one embodiment of the present invention, since groundwater is usually in a static state, the diffusion speed and range of the agent discharged through the diffuser 40 in the contaminated water layer 60 are limited. In order to solve the above problem, an agent channel 400 and a mixing channel 401 are provided in the diffuser 40. The agent channel 400 can be arranged in an arc-shaped structure, and the mixing channel 401 is connected to the agent channel 400. When the fluid in the mixing channel 401 flows into the agent channel 400, the flow direction is the same as that of the fluid in the agent channel 400. Furthermore, a one-way valve can be provided in the mixing channel 401 to control the flow direction of the fluid in the period. Specifically, the ozone diffuser 40 is taken as an example for explanation. Figure 9, the outlet of the drug channel 400 can be set on one side of the diffuser 40, and the inlet of the mixing channel 401 can be set on the other side; Figure 10 , the outlet of the agent channel 400 can be set on the side of the diffuser 40, and the inlet of the mixing channel 401 can be set at the bottom of the diffuser 40. When the pressurized high-pressure ozone gas flows out through the agent channel 400, it can form a negative pressure in the mixing channel 401, thereby sucking water from the outside, and the water enters the agent channel 400, and then is discharged through the agent channel 400, so that the underground contaminated water layer 60 has a certain direction of fluidity, which can effectively improve the diffusion efficiency of the ozone agent. And ozone can be mixed with water in the agent channel 400 to improve the solubility of the agent. Figure 10 , which can make groundwater flow like the dotted line structure in the figure, slowing down the speed of ozone rising, thereby increasing the range over which ozone can diffuse, and in other words, increasing the most effective remediation range. The same applies to the structure of hydrogen peroxide.

[0079] See also Figure 11 In one embodiment of the present invention, since groundwater often contains a lot of sediment, in order to prevent the agent channel 400 from being blocked, a filter layer is provided at the outlet position of the agent channel 400 and the inlet position of the mixing channel 401. Furthermore, a vibration plate 402 is provided in the agent channel 400, and the vibration plate 402 is connected to the diffuser 40 through an elastic member (the elastic member can be a spring column). High-pressure ozone, air mixed gas or hydrogen peroxide impacts the vibration plate 402 when discharged. Since the vibration plate 402 is connected by an elastic member, the vibration plate 402 vibrates. The vibration is transmitted to the filter layer position to shake off some of the particles adhering thereto, thereby preventing the filter layer from being blocked. Furthermore, a transmission rod can be provided on the side of the vibration plate 402 close to the filter layer. When the vibration plate 402 oscillates, the transmission rod effectively transmits the vibration to the filter layer position through the other end.

[0080] See also Figure 12-13 In one embodiment of the present invention, since the groundwater is static and contains a lot of sediment, the diffusion rate of the agent after it is introduced into the remediation well 70 is limited. In addition, the well wall of the remediation well 70 may form a barrier that hinders the diffusion of the agent during drilling, thereby reducing the diffusion rate of the agent. The external rotation of the diffuser 40 is provided with a bracket 403, and a plurality of rotating plates 404 are fixedly provided on the bracket 403. During use, the bracket 403 is driven to rotate slowly by the power assembly, thereby driving the rotating plates 404 to rotate. This can displace the sediment around the diffuser 40 within a certain cylindrical space, reducing the possibility of the diffuser 40 outlet being blocked. At the same time, it can make the groundwater somewhat dynamic, thereby increasing the diffusion efficiency of the agent and the convection between the remediated and unremediated contaminated water, thereby improving the remediation efficiency.

[0081] See also Figure 13-14 In one embodiment of the present invention, the diffuser 40 can be cylindrical, and one end of the rotating plate 404 can fit the outer cylindrical surface of the diffuser 40. That is, one end of the rotating plate 404 can extend to the outer side of the contact filter layer, so that the rotating plate 404 can play the effect of cleaning the filter layer when rotating. The filter layer in the mixing channel 401 at the bottom can be cleaned by providing a corresponding extension structure on the bracket 403. When the rotating plate 404 rotates, a plurality of guide grooves 405 are provided on the side at the front end. The guide grooves 405 are arranged horizontally, and the guide grooves of the ozone diffuser 40 can be arranged with the outer ends tilted downward. After being discharged from the diffuser 40, the gaseous agent (ozone) will float up, while the liquid hydrogen peroxide will diffuse downward under the action of gravity. By providing a guide groove 405 on the rotating plate 404, the discharged medicine will be driven by it when it rotates, that is, the medicine will stick to the side surface at the front end when the rotating plate 404 rotates. By opening a horizontally arranged guide groove 405 on the side surface, part of the medicine will exist in the guide groove 405, which can effectively slow down the speed of the medicine floating up / diffusion downward, thereby increasing the range of the medicine diffusion and ensuring the effect of the medicine repair.

[0082] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A method for in-situ remediation of groundwater, characterized in that: The steps include: S1: Moving a mobile carrier carrying an ozone generation system, a hydrogen peroxide delivery system, a reagent dispensing system, and an automatic control system to a target location; drilling a remediation well at the target location, wherein the depth of the remediation well matches the depth of the contaminated groundwater layer to be treated; then inserting a delivery pipe for delivering ozone and hydrogen peroxide into the remediation well to the depth of the contaminated water layer in the remediation well, with the hydrogen peroxide outlet positioned above the ozone outlet, and a partition layer disposed between the outlets; S2: Preparation of reagents: S21: The air compression storage system works, sucking in ambient air from the outside, compressing it dryly, and then passing it into the cartridge filter. After filtration, the clean air is stored in the air storage tank; S22: Part of the air in the air storage tank is transported to the PSA oxygen generator to generate oxygen. The generated oxygen is sampled and tested and then stored in the oxygen storage tank after passing the test. S23: The oxygen in the oxygen storage tank is sent to the ozone generation system through the gas filter and the functional valve group to generate ozone; S3: ozone and hydrogen peroxide are pressurized and transported to the remediation well, with the molar ratio of hydrogen peroxide to ozone being greater than 0 and less than 0.

45. After the reagents are transported to the remediation well, they diffuse into the contaminated water layer through a diffuser at the end of the transport pipe. The hydrogen peroxide outlet is located at the top, and the hydrogen peroxide liquid flows downward and diffuses outward after being discharged under the action of gravity. The ozone outlet is located at the bottom, and the ozone gas floats upward and diffuses outward after being discharged. The two chemical substances converge in the contaminated layer and fully react, and the high oxidizing property of the hydroxyl free radicals generated during the reaction is utilized to degrade various pollutants in the soil and groundwater. The diffuser is provided with a medicine channel and a mixing channel, the mixing channel is connected to the medicine channel, the outlet of the medicine channel is arranged on the side of the diffuser, and the inlet of the mixing channel is arranged at the bottom of the diffuser; S4: After the repair is completed, the corresponding equipment is collected.

2. A groundwater in-situ remediation method according to claim 1, characterized in that: The outlet position of the medicine channel and the inlet position of the mixing channel are respectively provided with filter layers.

3. A groundwater in-situ remediation method according to claim 2, characterized in that: A vibration plate is provided in the medicine channel, and the vibration plate is connected to the diffuser through an elastic member.

4. A groundwater in-situ remediation method according to claim 3, characterized in that: The diffuser is externally rotatably provided with a bracket, and a plurality of rotating plates are fixedly provided on the bracket.

5. A groundwater in-situ remediation method according to claim 4, characterized in that: The diffuser is cylindrical, and one end of the rotating plate is in contact with the outer surface of the diffuser.

6. A groundwater in-situ remediation method according to claim 5, characterized in that: When the rotating plate rotates, a side surface at the front end is provided with a plurality of guide grooves.

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