An environmental remediation method based on deep well reinjection of purified groundwater

Abstract

The application is an environmental remediation method for purifying underground water by deep well reinjection, comprising the following steps: step 1, obtaining hydrogeological parameters and pollutant parameters of an underground water pollution area; step 2, determining treatment agent parameters based on the hydrogeological parameters and the pollutant parameters, wherein the treatment agent parameters comprise a treatment agent type, a reaction rate of the treatment agent and the pollutant, and a total injection amount of the treatment agent; step 3, constructing a reinjection well for deep well reinjection in the underground water pollution area to communicate with an aquifer; and step 4, completing deep well reinjection of the treatment agent. The method determines a pollution area, a pollutant type, and a spatial concentration distribution of the pollutant of an underground aquifer through early geological exploration, selects a corresponding treatment agent based on a pollution source type, injects the treatment agent into the aquifer through deep well reinjection, and controls injection parameters of the treatment agent through a diffusion model and an objective function constructed in the injection process, so as to ensure uniform distribution of the treatment agent in the aquifer and improve the purification efficiency and effect of the underground water.

Description

Technical Field

[0001] This application belongs to the field of groundwater purification and environmental remediation technology, and relates to an environmental remediation method based on deep well reinjection to purify groundwater. Background Technology

[0002] With the rapid development of industry and agriculture, groundwater pollution has become a major environmental issue of global concern. Traditional purification strategies, such as pumping and underground barrier technologies, while alleviating pollution to some extent, suffer from drawbacks such as high cost, low efficiency, and long remediation cycles. Against this backdrop, deep well reinjection technology, as a novel groundwater purification method, is increasingly attracting attention from the scientific community. This technology precisely injects specific treatment or remediation agents into the groundwater layer to accelerate the natural degradation of pollutants or promote their precipitation, thereby effectively purifying the water body.

[0003] However, the application of deep well reinjection technology still faces many challenges. Among these, the most critical is the difficulty of precisely controlling the reinjection process, including managing the reinjection rate and pressure, and addressing the uneven distribution of the treatment agent within the groundwater layer, which limits the purification effect. These problems directly impact the overall efficiency of groundwater purification and the actual effectiveness of environmental remediation, becoming bottlenecks restricting the widespread application of the technology. Summary of the Invention

[0004] In view of the defects and shortcomings of the existing technology, the purpose of this invention is to provide an environmental remediation method for purifying groundwater based on deep well reinjection, so as to solve the technical problem of uneven distribution of treatment agents in aquifers during deep well reinjection, and improve the efficiency and effect of groundwater purification.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An environmental remediation method for purifying groundwater using deep well reinjection, characterized by comprising the following steps:

[0007] Step 1: Obtain hydrogeological parameters and pollutant parameters of the groundwater contaminated area, including pollutant types;

[0008] Step 2: Based on the hydrogeological parameters and pollutant parameters, determine the treatment agent parameters, including the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total amount of treatment agent injected.

[0009] Step 3: Construct a deep well reinjection well in the groundwater contaminated area to connect with the aquifer. Install a flow meter, a flow velocity sensor, and a pressure sensor in the reinjection well. The flow meter is used to collect the flow rate of the treatment agent, the pressure sensor is used to collect the injection pressure, and the flow velocity sensor is used to measure the flow rate of the treatment agent.

[0010] Step 4: Complete the deep well reinjection of the treatment agent, which includes the following sub-steps:

[0011] Step 4.1: Based on the parameters obtained in Step 1 and the reaction rate between the treatment agent and the pollutants determined in Step 2, establish a treatment agent diffusion model;

[0012] Step 4.2: Based on the treatment agent diffusion model, construct an objective function with the objective of minimizing the deviation between the treatment agent concentration at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t.

[0013] Step 4.3: Initialize the injection parameters, which include the treatment agent injection rate and the treatment agent injection pressure;

[0014] Step 4.4: Perform iterative convergence processing on the objective function until the set stopping condition is met, then stop the iteration and output the injection parameters that meet the stopping condition as the preferred injection parameters;

[0015] Step 4.5: Adjust the injection parameters at the current time to the preferred injection parameters, continue injecting the treatment agent, and in the process of continuing to inject the treatment agent, determine in real time whether the deviation between the treatment agent concentration at any point in the groundwater in the polluted area at time t and the target average concentration of the treatment agent in the groundwater in the polluted area at time t exceeds the set deviation threshold. If yes, return to step 4.4; if no, proceed to step 4.6 after reaching the total amount of treatment agent injected in step 2.

[0016] Step 4.6: End the injection.

[0017] The present invention also has the following technical features:

[0018] Specifically, the types of pollutants include organic pollutants, heavy metal pollutants, and nutrient pollutants.

[0019] Furthermore, when the pollutant is an organic pollutant, a bioremediation agent is used as the reinjection treatment agent; when the pollutant is a heavy metal pollutant, a chemical precipitant is used as the reinjection treatment agent; and when the pollutant is a nutrient pollutant, an adsorbent is used as the reinjection treatment agent.

[0020] Furthermore, the bioremediation agent is selected from one or more of desulfurized Vibrio, Pseudomonas, laccase, and peroxidase; the chemical precipitant is selected from one or more of sodium sulfide, calcium hydroxide, phosphate, calcium sulfide, and iron salt; and the adsorbent is selected from one or more of activated carbon, zeolite, bentonite, biochar, and iron oxide.

[0021] Furthermore, the diffusion model of the treatment agent is as follows:

[0022]

[0023] In the formula:

[0024] C(v,P,x,y,z,t) represents the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mol / m³. 3 ;

[0025] f(v,P,x,y,z,t) is the velocity field function;

[0026] α is the adjustment term coefficient;

[0027] R(C(v,P,x,y,z,t)) represents the reaction rate between the treatment agent and the pollutant at time t;

[0028] D is the diffusion coefficient of the treatment agent;

[0029] v represents the injection rate of the treatment agent, in m / s;

[0030] P represents the injection pressure of the treatment agent, measured in Pa.

[0031] Furthermore, the adjustment term coefficient α is determined by the following formula:

[0032]

[0033] In the formula:

[0034] φ represents soil porosity;

[0035] K represents soil permeability;

[0036] k is an empirical constant.

[0037] Furthermore, the objective function is as follows:

[0038]

[0039] In the formula,

[0040] V represents the total volume of groundwater within the contaminated area, in cubic meters (m³). 3 ;

[0041] C(v,P,x,y,z,t) represents the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mg / L.

[0042] Let t represent the target average concentration of the treatment agent in the groundwater within the contaminated area at time t, expressed in mg / L.

[0043] v represents the injection rate of the treatment agent, in m / s;

[0044] P represents the injection pressure of the treatment agent, measured in Pa.

[0045] Furthermore, the total amount of treatment agent injected in step 2 is determined by the following formula:

[0046] Q = Mβ

[0047] In the formula:

[0048] Q represents the total amount of treatment agent injected, in mg.

[0049] M represents the total amount of pollutants, expressed in mg.

[0050] β represents the reaction ratio between the treatment agent and the pollutant.

[0051] Furthermore, the stopping condition described in step 4.4 is: the deviation between the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t is less than or equal to 2%.

[0052] Furthermore, the deviation threshold mentioned in step 4.5 is 4-6%.

[0053] Compared with the prior art, the beneficial technical effects of this invention are:

[0054] The method of this invention obtains hydrogeological parameters and pollutant parameters of groundwater pollution areas through preliminary geological exploration and hydrological analysis; determines treatment agent parameters based on pollutant parameters; and then injects the treatment agent into the aquifer through deep well reinjection. During the injection process, the injection parameters of the treatment agent are controlled by a constructed diffusion model and objective function to ensure that the treatment agent is evenly distributed in the aquifer, thereby improving the efficiency of groundwater purification and the actual effect of environmental remediation.

[0055] The present invention will be described in detail below with reference to specific embodiments. Attached Figure Description

[0056] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0057] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0058] The technical concept of this invention is as follows: through a systematic investigation of the characteristics of groundwater pollution, hydrological dynamics, and geological structure, a suitable treatment agent is selected based on the determined pollutant parameters. The injection and diffusion process of the treatment agent in the aquifer is controlled by a constructed diffusion model and objective function to achieve a uniform concentration distribution of the treatment agent in the groundwater within the wastewater area. This results in a highly efficient purification effect of the groundwater in the aquifer within the polluted area. In particular, by controlling the reaction rate, diffusion characteristics, and fluid velocity field of the treatment agent, its efficient diffusion and uniform distribution within the aquifer are achieved, thereby achieving an economical and environmentally friendly groundwater remediation effect.

[0059] Those skilled in the art should understand that, in the following description of the embodiments of this application, the sequence of numbers does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0060] Those skilled in the art will understand that the numerical ranges in the embodiments of this application should be understood to specifically disclose each intermediate value between the upper and lower limits of the range. Any stated value or intermediate value within a stated range, as well as any other stated value or each smaller range between intermediate values ​​within a range, are also included within this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0061] Unless otherwise stated, the technical / scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. While this application describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this application. All references to this specification are incorporated by way of citation to disclose and describe the methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0062] The present invention will be further described in detail below with reference to the embodiments.

[0063] Example 1

[0064] Following the above technical solution, this embodiment provides an environmental remediation method for purifying groundwater using deep well reinjection, characterized by comprising the following steps:

[0065] Step 1: Obtain hydrogeological parameters and pollutant parameters of the groundwater contaminated area, including pollutant types;

[0066] Specifically, this includes: determining pollutant parameters within the groundwater pollution area through groundwater pollution investigation and geological environment analysis, wherein the pollutant parameters include pollutant type and total amount; obtaining hydrogeological parameters within the groundwater pollution area through geological survey, wherein the hydrogeological parameters include the total volume of groundwater, soil permeability, and soil porosity within the pollution area; wherein, soil permeability and soil porosity, as geological characteristics, directly affect the diffusion behavior and flow path of the treatment agent.

[0067] As a preferred embodiment, common types of pollutants include organic pollutants, heavy metal pollutants, and nutrient pollutants.

[0068] Step 2: Based on the hydrogeological parameters and pollutant parameters, determine the treatment agent parameters, including the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total amount of treatment agent injected.

[0069] During the diffusion process, chemical reactions may occur between the treatment agent and the pollutant, leading to dynamic changes in the pollutant concentration. The reaction rate between the treatment agent and the pollutant can be determined in the laboratory using existing methods after field sampling of groundwater.

[0070] Specifically, the total amount of treatment agent injected is determined by the following formula:

[0071] Q = Mβ

[0072] In the formula:

[0073] Q represents the total amount of treatment agent injected, in mg.

[0074] M represents the total amount of pollutants, expressed in mg.

[0075] β represents the reaction ratio between the treatment agent and the pollutant.

[0076] β can be obtained experimentally. Specifically, it is determined by the mass or molar relationship between the treatment agent and the pollutant under reaction conditions, when the treatment agent undergoes a chemical reaction or biodegradation. For example, if removing 1 kg of pollutant requires 2 kg of treatment agent, then β = 2.

[0077] As a preferred example of this embodiment: when the pollutant type is organic, a bioremediation agent is selected as the reinjection treatment agent, utilizing a biodegradation process to decompose the pollutant; organic pollutants include petroleum hydrocarbons, pesticides, and organic solvents, such as chlorobenzene, phenol, dichlorophenol, nitrobenzene, xylene, and other benzene-containing organic pollutants. The bioremediation agent is selected from one or more of desulfurization vibrio, Pseudomonas, laccase, and peroxidase.

[0078] When the pollutant is a heavy metal pollutant, a chemical precipitant is selected as the reinjection treatment agent to remove the heavy metals through a chemical reaction. Heavy metals include copper (Cu), cadmium (Cd), lead (Pb), etc. The chemical precipitant is selected from one or more of sodium sulfide, calcium hydroxide, phosphate, calcium sulfide and iron salts.

[0079] When the pollutant type is nutrient pollutant, an adsorbent is selected as the treatment agent for reinjection. Nutrients are removed through the adsorption process. Nutrient pollutants include nitrogen, phosphorus, potassium, etc. The adsorbent is selected from one or more of activated carbon, zeolite, bentonite, biochar and iron oxide.

[0080] In selecting treatment agents, their environmental friendliness and economic cost must be comprehensively considered to ensure the high efficiency of the remediation process and the sustainability of the selected agents, which are non-toxic, biodegradable, and inexpensive. The selected treatment agents are non-toxic, biodegradable, and inexpensive.

[0081] Step 3: Based on the preliminary data collection and analysis, and combined with the on-site exploration, construct deep well reinjection wells to connect with the aquifer within the groundwater pollution area. Ensure that the drilling points comprehensively cover the pollution area. Prioritize placing reinjection wells near the pollution source or at key nodes in the pollutant migration path, such as upstream areas, so that the treatment agent can directly act on the pollution source and improve purification efficiency. Then, using specialized drilling equipment, construct reinjection wells to connect with the aquifer at the predetermined drilling depth and angle to ensure that the treatment agent can effectively enter the aquifer. Install flow meters, velocity sensors, and pressure sensors in the reinjection wells. The flow meters are used to collect the treatment agent flow rate, the pressure sensors are used to collect the injection pressure, and the velocity sensors are used to collect the treatment agent flow rate. The data collected by the flow meters, velocity sensors, and pressure sensors can be transmitted to a remote controller in real time.

[0082] Step 4: Complete the deep well reinjection of the treatment agent, which includes the following sub-steps:

[0083] Step 4.1: Based on the data collected in Step 1 and the reaction rate between the treatment agent and the pollutant determined in Step 2, establish a treatment agent diffusion model; where C(v,P,x,y,z,t) is the result under the action of the fluid velocity field f(v,P,x,y,z,t). The final treatment agent diffusion model is as follows. Then, by adjusting v and p, C(v,P,x,y,z,t) is continuously made closer to...

[0084] In the formula:

[0085] C(v,P,x,y,z,t) represents the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mol / m³.3 ;

[0086] f(v,P,x,y,z,t) is the velocity field function;

[0087] α is the adjustment term coefficient;

[0088] R(C(v,P,x,y,z,t)) represents the reaction rate between the treatment agent and the pollutant at time t;

[0089] D is the diffusion coefficient of the treatment agent;

[0090] v represents the injection rate of the treatment agent, in m / s;

[0091] P represents the injection pressure of the treatment agent, measured in Pa.

[0092] It describes the change of the agent flow velocity at any point in the velocity field over time.

[0093] in,

[0094]

[0095] D0 is the baseline diffusion coefficient measured under laboratory conditions;

[0096] φ represents soil porosity;

[0097] K represents soil permeability.

[0098] The adjustment term coefficient α is determined by the following formula:

[0099]

[0100] In the formula:

[0101] φ represents soil porosity;

[0102] K represents soil permeability;

[0103] k is an empirical constant.

[0104] The possible values ​​for k are as follows:

[0105] For clay layers, fractured clay layers, and silt layers, the value of k is (0.01~0.1);

[0106] For sandy loam, the value of k is (0.1~1);

[0107] For gravel or coarse-grained sand layers, the value of k ranges from 1 to 10.

[0108] Step 4.2: Based on the treatment agent diffusion model, construct an objective function with the objective of minimizing the deviation between the treatment agent concentration at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t.

[0109] Select the initial injection velocity v0 and injection pressure P0, both of which can be determined based on historical data or experimental results.

[0110] Step 4.3: Initialize the injection parameters, which include injection speed and injection pressure;

[0111] The objective function is as follows:

[0112]

[0113] In the formula,

[0114] V represents the total volume of groundwater in the contaminated area, in cubic meters (m³). 3 ;

[0115] C(v,P,x,y,z,t) represents the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mg / L.

[0116] C t The target average concentration of the treatment agent in the groundwater within the contaminated area at time t is expressed in mg / L; it can be determined based on the ratio between the total injection volume Q of the treatment agent up to time t and the total volume V of the aquifer.

[0117] v represents the injection rate of the treatment agent, in m / s;

[0118] P represents the injection pressure of the treatment agent, measured in Pa.

[0119] Based on the feedback from the objective function, v and P are adjusted through optimization algorithms (such as gradient descent) so that the deviation between the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t is gradually reduced.

[0120] Step 4.4: Perform iterative convergence processing on the objective function until the set stopping condition is met, then stop the iteration and output the injection parameters that meet the stopping condition as the preferred injection parameters to obtain the optimized injection speed and injection pressure.

[0121] The stopping condition is that the deviation between the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t is less than or equal to 2%.

[0122] The stopping condition is used to determine whether the optimization has reached a stable state, avoiding unnecessary iterative adjustments. Once the stopping condition is met, it is considered that the concentration distribution has reached a uniform state, and further adjustments are stopped.

[0123] Step 4.5: Adjust the current injection parameters to the optimal injection parameters and apply them to the actual injection process. Simultaneously, continue setting dynamic monitoring and adjustments to ensure the actual effect. Continue injecting the treatment agent, and during this process, use a flow meter and pressure sensor to monitor the current injection rate and pressure in real time to ensure consistency with the optimization results. Set a deviation threshold during real-time concentration monitoring. Determine in real-time whether the deviation between the treatment agent concentration at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t exceeds the set deviation threshold. If yes, return to step 4.4 to trigger a new iterative optimization process to readjust the injection parameters, ensuring uniformity of concentration distribution and timely response when the deviation exceeds the acceptable range. If no, proceed to step 4.6 after reaching the total injection volume of treatment agent.

[0124] Specifically, the deviation threshold set in this embodiment is 5%.

[0125] Step 4.6: End the injection.

[0126] Application examples

[0127] In this application example, the method disclosed in Example 1 is used to purify groundwater containing heavy metals. Preliminary investigation revealed that the pollutants are mainly concentrated in aquifers at depths of 20 to 50 meters, with lead (Pb) being the primary pollutant. Environmental remediation via deep well reinjection is required. Based on the lead content of the pollutant, sodium sulfide (Na2S) was selected as the treatment agent due to its low cost and ability to ensure the sustainability of the remediation process.

[0128] In this application example, real-time monitoring confirmed that the method disclosed in Example 1 ensured the uniform distribution of the treatment agent within the aquifer. After reinjection, sampling and testing confirmed that the Pb content in the groundwater within the contaminated area was significantly reduced and uniformly distributed at different locations. This demonstrates that the method of the present invention can significantly improve the efficiency of groundwater purification and the actual effect of environmental remediation.

[0129] The above-described implementation process is merely an example to clearly illustrate this application and is not intended to limit the implementation methods. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementation methods here. However, obvious variations or modifications derived therefrom are still within the protection scope of this application.

Claims

1. An environmental remediation method for purifying groundwater by deep well reinjection, characterized by, Includes the following steps: Step 1: Obtain hydrogeological parameters and pollutant parameters of the groundwater contaminated area, including pollutant types; Step 2: Based on the hydrogeological parameters and pollutant parameters, determine the treatment agent parameters, including the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total amount of treatment agent injected. Step 3: Construct a deep well reinjection well in the groundwater contaminated area to connect with the aquifer. Install a flow meter, a flow velocity sensor, and a pressure sensor in the reinjection well. The flow meter is used to collect the flow rate of the treatment agent, the pressure sensor is used to collect the injection pressure, and the flow velocity sensor is used to measure the flow rate of the treatment agent. Step 4: Complete the deep well reinjection of the treatment agent, which includes the following sub-steps: Step 4.1: Based on the parameters obtained in Step 1 and the reaction rate between the treatment agent and the pollutants determined in Step 2, establish a treatment agent diffusion model; Step 4.2: Based on the treatment agent diffusion model, construct an objective function with the objective of minimizing the deviation between the treatment agent concentration at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t. Step 4.3: Initialize the injection parameters, which include the treatment agent injection rate and the treatment agent injection pressure; Step 4.4: Perform iterative convergence processing on the objective function until the set stopping condition is met, then stop the iteration and output the injection parameters that meet the stopping condition as the preferred injection parameters; Step 4.5: Adjust the injection parameters at the current time to the preferred injection parameters, continue injecting the treatment agent, and in the process of continuing to inject the treatment agent, determine in real time whether the deviation between the treatment agent concentration at any point in the groundwater in the polluted area at time t and the target average concentration of the treatment agent in the groundwater in the polluted area at time t exceeds the set deviation threshold. If yes, return to step 4.4; if no, proceed to step 4.6 after reaching the total amount of treatment agent injected in step 2. Step 4.6: End the injection.

2. The environmental restoration method for purifying groundwater by deep-well reinjection according to Claim 1, wherein The types of pollutants include organic pollutants, heavy metal pollutants, and nutrient pollutants.

3. The environmental restoration method for purifying groundwater by deep-well reinjection according to Claim 1, wherein When the pollutant is an organic pollutant, a bioremediation agent is used as the reinjection treatment agent; when the pollutant is a heavy metal pollutant, a chemical precipitant is used as the reinjection treatment agent; when the pollutant is a nutrient pollutant, an adsorbent is used as the reinjection treatment agent.

4. The environmental restoration method for purifying groundwater by deep-well reinjection according to Claim 3, characterized by, The bioremediation agent is selected from one or more of desulfurized Vibrio, Pseudomonas, laccase, and peroxidase; the chemical precipitant is selected from one or more of sodium sulfide, calcium hydroxide, phosphate, calcium sulfide, and iron salt; and the adsorbent is selected from one or more of activated carbon, zeolite, bentonite, biochar, and iron oxide.

5. The environmental restoration method for purifying groundwater by deep-well reinjection according to Claim 1, wherein The diffusion model of the treatment agent is as follows: In the formula: C(v,P,x,y,z,t) Let t be the concentration of the treatment agent at any point in the groundwater within the contaminated area, in mol / m³. 3 ; f(v,P,x,y,z,t) Let this be the velocity field function; a This is the adjustment term coefficient; R(C(v,P,x,y,z,t)) Let t be the reaction rate between the treatment agent and the pollutant. D The diffusion coefficient of the treatment agent; v The injection rate of the treatment agent is expressed in m / s. P The injection pressure of the treatment agent is expressed in Pa.

6. The environmental remediation method for purifying groundwater using deep well reinjection as described in claim 5, characterized in that, The adjustment term coefficient α is determined by the following formula: In the formula: Soil porosity; K Soil permeability; k is an empirical constant.

7. The environmental remediation method for purifying groundwater using deep well reinjection as described in claim 1, characterized in that, The objective function is as follows: In the formula, V The total volume of groundwater in the contaminated area is expressed in m³. C(v,P,x,y,z,t) Let t represent the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mg / L. Let t represent the target average concentration of the treatment agent in the groundwater within the contaminated area at time t, expressed in mg / L. v The injection rate of the treatment agent is expressed in m / s. P The injection pressure of the treatment agent is expressed in Pa.

8. The environmental remediation method for purifying groundwater using deep well reinjection as described in claim 1, characterized in that, The total amount of treatment agent injected in step 2 is determined by the following formula: Q=Mβ In the formula: Q represents the total amount of treatment agent injected, in mg. M represents the total amount of pollutants, expressed in mg. β represents the reaction ratio between the treatment agent and the pollutant.

9. The environmental remediation method for purifying groundwater using deep well reinjection as described in claim 1, characterized in that, The stopping condition described in step 4.4 is: the deviation between the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t and the target average concentration of the treatment agent in the groundwater within the contaminated area at time t is less than or equal to 2%.

10. The environmental remediation method for purifying groundwater using deep well reinjection as described in claim 1, characterized in that, The deviation threshold mentioned in step 4.5 is 4~6%.

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