Circulating chemical injection system for polluted soil

Abstract

The utility model relates to the technical field of soil remediation, and discloses a circulating chemical injection system for contaminated soil, which comprises a sodium persulfate dissolving and activating tank, a solution tank stirrer is arranged at the top of the sodium persulfate dissolving and activating tank, and a small-flow metering pump is arranged at the output end of the sodium persulfate dissolving and activating tank. One side of the small-flow metering pump is connected to the input end of a sodium persulfate solution storage tank through a chemical conveying pipe, a solution tank stirrer is arranged at the top of the sodium persulfate solution storage tank, and a large-flow metering pump is arranged at the output end of the sodium persulfate solution storage tank; the output end of the pressurization system is evenly connected with adjusting valves through chemical conveying pipes. According to the utility model, by introducing an innovative small-tooth-mouth steel sheet pile waterproof curtain technology, the environmental safety and efficiency of the repair work are remarkably improved, the small-tooth-mouth steel sheet piles are unique in design, so that the installation process is rapid and efficient, and the exchange between peripheral underground water and underground water in a repair area can be cut off to prevent secondary diffusion of pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of soil remediation, in particular to a circulating medicine injection system for contaminated soil. Background Technique

[0002] Soil remediation refers to restoring or improving the quality of contaminated or degraded soil through various technical means so that it can support vegetation growth, crop planting or other land use methods again. The background technology of soil remediation covers technical means in multiple aspects such as physics, chemistry and biology. By comprehensively applying these technologies, the quality of the contaminated or degraded soil environment can be effectively restored.

[0003] However, when dealing with petroleum hydrocarbon contaminated soil, traditional remediation technologies face challenges in many aspects. A commonly used method is in-situ chemical oxidation, which uses strong oxidants to directly carry out chemical reactions at the contaminated site to decompose organic pollutants. However, traditional in-situ chemical oxidation technologies have some limitations, such as low drug use efficiency, difficulty in controlling the diffusion of drugs, and secondary pollution problems of the treated soil. Content of the Utility Model

[0004] In order to make up for the above deficiencies, the utility model provides a circulating medicine injection system for contaminated soil, aiming to improve the problems existing in traditional in-situ chemical oxidation technologies, such as low drug use efficiency, difficulty in controlling the diffusion of drugs, and secondary pollution of the treated soil.

[0005] To achieve the above object, the utility model provides the following technical solution: A circulating medicine injection system for contaminated soil, including a sodium persulfate dissolution and activation tank, a solution tank mixer is arranged at the top of the sodium persulfate dissolution and activation tank, a small flow metering pump is arranged at the output end of the sodium persulfate dissolution and activation tank, one side of the small flow metering pump is connected to the input end of a sodium persulfate solution storage tank through a medicine delivery pipe, a solution tank mixer is arranged at the top of the sodium persulfate solution storage tank, a large flow metering pump is arranged at the output end of the sodium persulfate solution storage tank, one side of the large flow metering pump is connected to the input end of a pressurization system through a medicine delivery pipe, and the output end of the pressurization system is uniformly connected with regulating valves through a medicine delivery pipe.

[0006] Preferably, a medicine adding port is arranged on one side of the sodium persulfate dissolution and activation tank, and a tap water pipe is connected to the input end of the sodium persulfate dissolution and activation tank.

[0007] Preferably, the output end of the regulating valve is connected to an injection well through a medicine delivery pipe, and the injection well is arranged in the original soil layer of the contaminated soil.

[0008] Preferably, a water injection well is provided on one side of the injection well. The water injection well is arranged in the original soil layer of the polluted soil, and the depth of the water injection well is 1000 to 2000 millimeters deeper than that of the injection well.

[0009] Preferably, a sewage lift pump is provided at the top of the water injection well through a water delivery pipe. The output end of the sewage lift pump is connected to the input end of the integrated sewage treatment equipment through a water delivery pipe.

[0010] Preferably, a sodium persulfate solution return pipe is provided at the top of the integrated sewage treatment equipment, and one end of the sodium persulfate solution return pipe is connected to the inside of the sodium persulfate solution storage tank.

[0011] Preferably, the output end of the integrated sewage treatment equipment is connected to the municipal pipe network through a sewage discharge pipe.

[0012] Preferably, small-tooth steel sheet piles are evenly arranged around the polluted soil.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, the system is easy to install, can be reused, can realize the repeated circulation use of the oxidation agent sodium persulfate and prevent the spread of soil pollution with the injection of medicine. It is especially suitable for independent petroleum hydrocarbon soil pollution patches. By using a highly efficient injection well and water injection well configuration, an injection-pumping-circulation disposal system is created to improve the use efficiency of the oxidant and the repair effect.

[0015] 2. In the utility model, by introducing the innovative small-tooth steel sheet pile cut-off water curtain technology, the environmental safety and efficiency of the repair work are significantly improved. The small-tooth steel sheet pile has a unique design, high adaptability and flexibility, making the installation process fast and efficient. The small-tooth steel sheet pile cut-off water curtain can cut off the spread of sodium persulfate agent and petroleum hydrocarbon pollution with the injection of medicine, and can also cut off the exchange of groundwater outside and groundwater in the repair area to prevent secondary pollution spread.

[0016] 3. In the utility model, the uniform layout of the injection well and the water injection well in the site further optimizes the distribution and recovery efficiency of the medicine, preventing the problems of insufficient oxidation in local areas or insufficient medicine recovery. Through this carefully designed layout, the system can form an efficient chemical oxidation network in the entire area to be repaired, greatly improving the efficiency and effect of the entire repair process, shortening the repair cycle, and at the same time reducing the impact on the environment. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a circulating medicine injection system for polluted soil proposed by the utility model.

[0018] Legend:

[0019] 1. Sodium persulfate dissolution and activation tank; 2. Solution tank agitator; 3. Small flow metering pump; 4. Sodium persulfate solution storage tank; 5. Large flow metering pump; 6. Pressurization system; 7. Regulating valve; 8. Injection well; 9. Return well; 10. Small-tooth steel sheet pile; 11. Sewage lift pump; 12. Integrated sewage treatment equipment; 13. Sodium persulfate solution return pipe; 14. Drain pipe. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Refer to Figure 1 , an embodiment provided by the present invention: A circulating medicine injection system for contaminated soil, including a sodium persulfate dissolution and activation tank 1, a solution tank agitator 2 is arranged at the top of the sodium persulfate dissolution and activation tank 1, a small flow metering pump 3 is arranged at the output end of the sodium persulfate dissolution and activation tank 1, one side of the small flow metering pump 3 is connected to the input end of the sodium persulfate solution storage tank 4 through a medicine delivery pipe, a solution tank agitator 2 is arranged at the top of the sodium persulfate solution storage tank 4, a large flow metering pump 5 is arranged at the output end of the sodium persulfate solution storage tank 4, one side of the large flow metering pump 5 is connected to the input end of the pressurization system 6 through a medicine delivery pipe, and the output end of the pressurization system 6 is uniformly connected with a regulating valve 7 through a medicine delivery pipe; a medicine adding port is arranged on one side of the sodium persulfate dissolution and activation tank 1, and a tap water pipe is connected to the input end of the sodium persulfate dissolution and activation tank 1; the output end of the regulating valve 7 is connected to an injection well 8 through a medicine delivery pipe, and the injection well 8 is arranged in the original soil layer of the contaminated soil; a return well 9 is arranged on one side of the injection well 8, the return well 9 is arranged in the original soil layer of the contaminated soil, and the depth of the return well 9 is 1000 to 2000 millimeters deeper than the depth of the injection well 8.

[0022] Specifically, solid or liquid medicaments are added into the sodium persulfate dissolution and activation tank 1 through the medicament addition port. Tap water is connected, and the solution tank mixer 2 is started for medicament dissolution and stirring. After the medicament dissolution is completed, the metering pump 3 is started, and the activated sodium persulfate liquid medicine is sent to the sodium persulfate solution storage tank 4 through the medicine delivery pipe. The solution tank mixer 2 is started for stirring to prevent the medicament from separating and precipitating. When medicine injection is required, the metering pump 5 is started, and the contaminated soil is injected with medicine through the pressurization system 6. The regulating valve 7 can control the opening and closing and the flow rate of each medicine injection pipe. This system is convenient to install, can be reused, can realize the repeated recycling of the oxidation medicament sodium persulfate and prevent the spread of soil pollution with medicine injection, and is especially suitable for independent petroleum hydrocarbon soil pollution patches. A mixer is installed inside the solution tank to accelerate the dissolution of solid sodium persulfate powder and keep the medicament in a uniformly dissolved state. The metering pump and the medicine addition system can be configured with sodium persulfate medicaments of different concentrations according to different pollution degrees.

[0023] A sewage lift pump 11 is arranged at the top of the water return well 9 through a water delivery pipe. The output end of the sewage lift pump 11 is connected to the input end of the integrated sewage treatment device 12 through a water delivery pipe. A sodium persulfate solution return pipe 13 is arranged at the top of the integrated sewage treatment device 12. One end of the sodium persulfate solution return pipe 13 is connected to the inside of the sodium persulfate solution storage tank 4. The output end of the integrated sewage treatment device 12 is connected to the municipal pipe network through a sewage discharge pipe 14. Small-tooth steel sheet piles 10 are uniformly arranged around the contaminated soil.

[0024] Specifically, the medicament is injected into the contaminated soil through the injection well 8. At the same time, the diffusion of the medicament is accelerated through the water return well 9, and the remaining medicament is recovered. The recovered medicament is transported to the integrated sewage treatment equipment 12 through the sewage lift pump 11 for disposal. The sodium persulfate solution that has not fully reacted after disposal re-enters the sodium persulfate solution storage tank 4 through the water return pipe 13, and the sewage enters the municipal pipe network through the sewage discharge pipe 14. When it is necessary to repair the designated petroleum hydrocarbon contaminated soil, a closed water cutoff curtain can be formed by driving in small-tooth steel sheet piles 10 to cut off the interaction between the repair area and the surrounding groundwater; the injection well 8 can inject the sodium persulfate medicament under normal pressure or high pressure, and gradually cover the entire area under the action of lateral and longitudinal diffusion, and achieve the repair effect after contacting and reacting with the pollutants; the water return well 9 can accelerate the flow rate of the sodium persulfate medicament and the diffusion rate of the medicament, improve the treatment effect, shorten the repair cycle, and can also recover the sodium persulfate medicament that has not fully reacted; the water cutoff curtain of the small-tooth steel sheet pile 10 can cut off the diffusion of the sodium persulfate medicament and petroleum hydrocarbon pollution during injection, and can also cut off the exchange of the surrounding groundwater and the groundwater in the repair area to prevent secondary pollution diffusion; the integrated sewage treatment equipment 12 can treat the sodium persulfate medicament that has not fully reacted extracted by the water return well 9 to achieve the purpose of recycling the sodium persulfate medicament; and the injection well 8 and the water return well 9 adopt a durable cast iron column design. This design not only ensures the structural stability but also ensures a long service life. There are 10-mm openings at the lower part of the cast iron column. These openings enable oxidation medicaments such as sodium persulfate to be evenly distributed in the contaminated soil, and at the same time facilitate the water return well 9 to efficiently recover the unreacted medicament, realizing the maximization of resource utilization. In order to adapt to different geological conditions and pollution situations, the burial depth of the water return well 9 is usually 1000 to 2000 mm deeper than that of the injection well 8. This design enables the water return well 9 to more effectively recover the oxidant, ensuring the full reaction of the medicament in the soil and a wider coverage area. The uniform layout of the injection well 8 and the water return well 9 in the site further optimizes the distribution and recovery efficiency of the medicament, preventing the problems of insufficient oxidation in local areas or insufficient medicament recovery.Through this carefully designed layout, the system can form an efficient chemical oxidation network throughout the area to be repaired, greatly improving the efficiency and effectiveness of the entire repair process, shortening the repair cycle, and reducing the environmental impact at the same time. The small-tooth steel sheet pile 10 is uniquely designed with high adaptability and flexibility, making the installation process fast and efficient. The steel sheet piles can be flexibly lapped according to the pollution depth and geological conditions to ensure the formation of an effective barrier layer in various environments, isolating the interaction between the repair area and the surrounding groundwater. This isolation effect is crucial as it prevents the spread of pollutants to unpolluted areas along with groundwater flow during the chemical oxidation process, effectively controlling the localization of pollution. In addition, the small-tooth steel sheet pile 10 exhibits extremely high stability in the soil layer and can maintain the integrity of its structure and the continuity of its function even under complex or unstable geological conditions. This steel sheet pile also has the advantage of being reusable, which not only reduces material costs but also conforms to the environmental protection concept of sustainable development. Through repeated recycling, the small-tooth steel sheet pile 10 becomes a cost-effective option, bringing double economic advantages to the repair project: reducing the demand and cost of new materials and reducing waste generation at the same time.

[0025] Working principle: Solid or liquid agents are added to the sodium persulfate dissolution and activation tank 1 through the chemical addition port. Tap water is connected and the solution tank agitator 2 is started to dissolve and stir the chemicals. After the dissolution is completed, the metering pump 3 is started, and the activated sodium persulfate solution is sent to the sodium persulfate solution storage tank 4 through the chemical delivery pipe. The solution tank agitator 2 is started to stir to prevent the separation and precipitation of the agents. When drug injection is required, the metering pump 5 is started, and the contaminated soil is injected with drugs through the pressurization system 6. The regulating valve 7 can control the opening and closing and the flow rate of each drug injection pipe. The agent is injected into the contaminated soil through the injection well 8. At the same time, the agent diffusion is accelerated through the water return well 9 and the remaining agent is recovered. The recovered agent is transported to the integrated sewage treatment equipment 12 for disposal through the sewage lift pump 11. The unreacted sodium persulfate solution after disposal re-enters the sodium persulfate solution storage tank 4 through the water return pipe 13, and the sewage enters the municipal pipe network through the sewage discharge pipe 14. When it is necessary to repair the designated petroleum hydrocarbon contaminated soil, a closed water cutoff curtain can be formed by driving in the small-tooth steel sheet piles 10 to isolate the interaction between the repair area and the surrounding groundwater.

[0026] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A circulating injection system for contaminated soil, comprising a sodium persulfate dissolution activation tank (1), characterized in that: A solution tank stirrer (2) is arranged on the top of the sodium persulfate dissolving and activating tank (1); a small flow metering pump (3) is arranged at the output end of the sodium persulfate dissolving and activating tank (1); one side of the small flow metering pump (3) is connected to the input end of the sodium persulfate solution storage tank (4) through a drug delivery tube; a solution tank stirrer (2) is arranged on the top of the sodium persulfate solution storage tank (4); a large flow metering pump (5) is arranged at the output end of the sodium persulfate solution storage tank (4); one side of the large flow metering pump (5) is connected to the input end of a pressurizing system (6) through a drug delivery tube; and the output end of the pressurizing system (6) is evenly connected to a regulating valve (7) through the drug delivery tube.

2. A circulating injection system for contaminated soil according to claim 1, characterized in that: A drug adding port is provided on one side of the sodium persulfate dissolution and activation tank (1), and a tap water pipe is connected to the input end of the sodium persulfate dissolution and activation tank (1).

3. The circulating injection system for contaminated soil according to claim 1 is characterized by: The output end of the regulating valve (7) is connected to an injection well (8) via a drug delivery tube, and the injection well (8) is arranged in the original soil layer of the contaminated soil.

4. A circulating injection system for contaminated soil according to claim 3, characterized in that: A return water well (9) is arranged on one side of the injection well (8), and the return water well (9) is arranged in the original soil layer of the contaminated soil. The depth of the return water well (9) is 1000 to 2000 mm deeper than the depth of the injection well (8).

5. A circulating injection system for contaminated soil according to claim 4, characterized in that: A sewage lifting pump (11) is provided at the top of the return water well (9) via a water pipe, and the output end of the sewage lifting pump (11) is connected to the input end of the integrated sewage treatment equipment (12) via the water pipe.

6. A circulating injection system for contaminated soil according to claim 5, characterized in that: A sodium persulfate solution return pipe (13) is provided on the top of the integrated sewage treatment equipment (12), and one end of the sodium persulfate solution return pipe (13) is connected to the interior of the sodium persulfate solution storage tank (4).

7. A circulating injection system for contaminated soil according to claim 5, characterized in that: The output end of the integrated sewage treatment equipment (12) is connected to the municipal pipe network via a sewage pipe (14).

8. The circulating injection system for contaminated soil according to claim 3 is characterized by: Small-tooth steel sheet piles (10) are evenly arranged around the periphery of the contaminated soil.

Images