Environment restoration method based on deep well reinjection and purification of underground water

Abstract

The invention relates to an environment restoration method for purifying underground water through deep well reinjection. The method comprises the steps that 1, hydrogeological parameters and pollutant parameters of an underground water polluted area are obtained; 2, on the basis of the hydrogeological parameters and the pollutant parameters, treating agent parameters are determined, and the treating agent parameters comprise the treating agent type, the reaction rate of a treating agent and pollutants and the total injection amount of the treating agent; 3, a reinjection well for deep well reinjection is constructed in the groundwater polluted area to the communicating aquifer; 4, deep well reinjection of the treating agent is completed; according to the method, the polluted area, the pollutant type and the pollutant space concentration distribution of the underground aquifer are determined through early-stage geological exploration; selecting a corresponding treatment agent based on the pollution source type; the treatment agent is injected into the aquifer through deep well reinjection, and the injection parameters of the treatment agent are controlled through the constructed diffusion model and target function in the injection process, so that the treatment agent is ensured to be uniformly distributed in the aquifer, and the underground water purification efficiency and effect are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of groundwater purification and environmental restoration, and relates to an environmental restoration method based on deep well reinjection to purify groundwater. Background Art

[0002] With the rapid development of industry and agriculture, groundwater pollution has become one of the important environmental issues of global concern. Although traditional purification strategies such as pumping purification and underground barrier technology have alleviated environmental pollution problems to a certain extent, they have the disadvantages of high cost, low efficiency and long repair cycle. In this context, deep well reinjection technology, as a new method of groundwater purification, is increasingly attracting the attention of the scientific research community. This technology accurately injects specific treatment agents or repair 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 current application of deep well reinjection technology still faces many challenges. Among them, the most critical is the difficulty of precise control of the reinjection process, including the control of reinjection speed and pressure, and the uneven distribution of treatment agents in the groundwater layer, which limits the purification effect. These problems directly affect the overall efficiency of groundwater purification and the actual effect of environmental restoration, and have become a bottleneck restricting the widespread application of the technology. Summary of the invention

[0004] In view of the defects and shortcomings of the prior art, the purpose of the present invention is to provide an environmental remediation method based on deep well reinjection to purify groundwater, so as to solve the technical problem of uneven distribution of treatment agents injected into deep wells in the prior art in the aquifer, and to improve the efficiency and effect of groundwater purification.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] An environmental remediation method for purifying groundwater by deep well reinjection, characterized in that it comprises the following steps:

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

[0008] Step 2: Based on the hydrogeological parameters and pollutant parameters, determine the treatment agent parameters, wherein the treatment agent parameters include the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total injection amount of the treatment agent;

[0009] Step 3: construct a deep well reinjection well in the groundwater contaminated area to communicate with the aquifer, and install a flow meter, a flow rate sensor and a pressure sensor in the reinjection well, wherein 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 rate sensor is used to measure the flow rate of the treatment agent;

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

[0011] Step 4.1, establishing a treatment agent diffusion model based on the parameters obtained in step 1 and the reaction rate between the treatment agent and the pollutant determined in step 2;

[0012] Step 4.2, based on the treatment agent diffusion model, construct an objective function with the goal 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, initializing injection parameters, wherein the injection parameters include treatment agent injection speed and treatment agent injection pressure;

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

[0015] Step 4.5, adjusting the injection parameters at the current moment to the preferred injection parameters, continuing to inject the treatment agent, and in the process of continuing to inject the treatment agent, judging in real time whether the deviation between the treatment agent concentration at any point in the groundwater in the contaminated area at time t and the target average concentration of the treatment agent in the groundwater in the contaminated area at time t exceeds the set deviation threshold, if so, returning to step 4.4; if not, entering step 4.6 after reaching the total injection amount of the treatment agent determined in step 2;

[0016] Step 4.6, end the injection.

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

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

[0019] Furthermore, when the pollutants are organic pollutants, bioremediation agents are used as reinjection treatment agents; when the pollutants are heavy metal pollutants, chemical precipitants are used as reinjection treatment agents; when the pollutants are nutrient pollutants, adsorbents are used as reinjection treatment agents.

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

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

[0022]

[0023] Where:

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

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

[0026] ɑ is the adjustment term coefficient;

[0027] R(C(v,P,x,y,z,t)) is 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 is the injection speed of the treatment agent, in m / s;

[0030] P is the treatment agent injection pressure, in Pa.

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

[0032]

[0033] Where:

[0034] φ is soil porosity;

[0035] K is soil permeability;

[0036] k is an empirical constant.

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

[0038]

[0039] In the formula,

[0040] V is the total volume of groundwater in the contaminated area, in m 3 ;

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

[0042] is the target average concentration of the treatment agent in the groundwater of the contaminated area at time t, in mg / L;

[0043] v is the injection speed of the treatment agent, in m / s;

[0044] P is the treatment agent injection pressure, in Pa.

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

[0046] Q=Mβ

[0047] Where:

[0048] Q is the total injection amount of treatment agent, in mg;

[0049] M is the total amount of pollutants, in mg;

[0050] β is the reaction ratio of the treatment agent to the pollutant.

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

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

[0053] Compared with the prior art, the present invention has the following beneficial technical effects:

[0054] The method of the present invention obtains hydrogeological parameters and pollutant parameters of the groundwater contaminated area through preliminary geological exploration and hydrological analysis; determines the treatment agent parameters based on the pollutant parameters; then injects the treatment agent into the aquifer through deep well reinjection, and during the injection process, controls the injection parameters of the treatment agent through the 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 restoration.

[0055] The present invention is described in detail below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0057] In accordance with the above technical scheme, 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 changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0058] The technical concept of the present invention is: through a systematic investigation of groundwater pollution characteristics, hydrological dynamics and geological structure, a suitable treatment agent is selected according to the determined pollutant parameters, and the injection and diffusion process of the treatment agent in the aquifer is controlled by the constructed diffusion model and objective function to achieve a uniform concentration distribution of the treatment agent in the groundwater in the sewage area, thereby achieving an efficient purification effect of the groundwater in the aquifer in the polluted area, especially by controlling the reaction rate, diffusion characteristics and fluid velocity field of the treatment agent, so as to achieve its efficient diffusion and uniform distribution in the aquifer, 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 the present application, the order of serial numbers does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and 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 the present application.

[0060] Those skilled in the art will appreciate that the numerical ranges in the embodiments of the present application are to be construed as also specifically disclosing each intermediate value between the upper and lower limits of the scope. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded in the scope.

[0061] Unless otherwise specified, the technical / scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs. Although this application only describes preferred methods and materials, any methods and materials similar or equivalent to these may also be used in the implementation or testing of this application. All documents mentioned in this specification are incorporated by reference to disclose and describe methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

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

[0063] Example 1

[0064] In accordance with the above technical solution, this embodiment provides an environmental remediation method for purifying groundwater by deep well reinjection, which is characterized by comprising the following steps:

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

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

[0067] As a preferred solution of this embodiment, common pollutant types 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, wherein the treatment agent parameters include the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total injection amount of the treatment agent;

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

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

[0071] Q=Mβ

[0072] Where:

[0073] Q is the total injection amount of treatment agent, in mg;

[0074] M is the total amount of pollutants, in mg;

[0075] β is the reaction ratio of the treatment agent to the pollutant.

[0076] β can be obtained through experiments. Specifically, it is obtained by: under the reaction conditions, when the treatment agent and the pollutant undergo chemical reaction or biological degradation, the corresponding relationship between the mass or molar amount of the treatment agent and the pollutant. For example, if 2 kg of treatment agent is required to remove 1 kg of pollutant, then β = 2.

[0077] As a preferred example of this embodiment: when the pollutant type is an organic pollutant, a bioremediation agent is selected as a reinjection treatment agent to decompose the pollutant by a biodegradation process; the organic pollutants include petroleum hydrocarbons, pesticides, 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 Desulfovibrio, Pseudomonas, laccase and peroxidase.

[0078] When the pollutant type is heavy metal pollutant, a chemical precipitant is selected as a reinjection treatment agent to remove heavy metals through chemical reactions; heavy metals, such as 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 salt.

[0079] When the pollutant type is nutrient pollutants, an adsorbent is selected as a reinjection treatment agent to remove nutrients through an 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 oxides.

[0080] In the process of selecting the treatment agent, the environmental friendliness and economic cost of the treatment agent need to be comprehensively considered to ensure the high efficiency of the repair process and the sustainability of the selected treatment agent with the characteristics of non-toxicity, degradability and low cost. The selected treatment agent has the characteristics of non-toxicity, degradability and low cost.

[0081] Step 3. Based on the results of preliminary data collection and preliminary analysis, combined with the on-site exploration situation, deep well reinjection wells are constructed in the groundwater contaminated area to communicate with the aquifer, ensuring that the distribution of drilling points can fully cover the pollution range. Priority is given to arranging reinjection wells near the pollution source or at key nodes of the pollutant migration path, such as in the upstream area of ​​the water flow, so that the treatment agent can directly act on the pollution source and improve the purification efficiency. Then, professional drilling equipment is used to operate according to the predetermined drilling depth and angle, and reinjection wells are constructed to communicate with the aquifer to ensure that the treatment agent can effectively enter the aquifer. Flow meters, flow rate sensors and pressure sensors are installed in the reinjection wells. The flow meter is used to collect the flow of the treatment agent, the pressure sensor is used to collect the injection pressure, and the flow rate sensor is used to collect the flow rate of the treatment agent. The data collected by the flow meter, flow rate sensor and pressure sensor can be transmitted to the remote controller in real time.

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

[0083] Step 4.1: Establish a treatment agent diffusion model based on the data collected in step 1 and the reaction rate between the treatment agent and the pollutant determined in step 2; where C(v, P, x, y, z, t) is the result of the fluid velocity field f(v, P, x, y, z, t). The final treatment agent diffusion model is as follows, and then adjust v and p to make C(v, P, x, y, z, t) approach

[0084] Where:

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

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

[0087] ɑ is the adjustment term coefficient;

[0088] R(C(v,P,x,y,z,t)) is 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 is the injection speed of the treatment agent, in m / s;

[0091] P is the treatment agent injection pressure, in Pa.

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

[0093] in,

[0094]

[0095] D 0 is the benchmark diffusion coefficient measured under laboratory conditions;

[0096] φ is soil porosity;

[0097] K is the soil permeability.

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

[0099]

[0100] Where:

[0101] φ is soil porosity;

[0102] K is soil permeability;

[0103] k is an empirical constant.

[0104] The values ​​of k are as follows:

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

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

[0107] For gravel layer or coarse-grained sand layer, the value of k is (1 to 10).

[0108] Step 4.2, based on the treatment agent diffusion model, construct an objective function with the goal 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 v 0 and injection pressure P 0 , and the initial injection speed v 0 and injection pressure P 0 Both can be determined based on historical data or experimental results.

[0110] Step 4.3, initializing injection parameters, wherein the injection parameters include injection speed and injection pressure;

[0111] The objective function is as follows:

[0112]

[0113] In the formula,

[0114] V is the total volume of groundwater in the contaminated area, in m 3 ;

[0115] C(v,P,x,y,z,t) is 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 is the target average concentration of the treatment agent in the groundwater of the contaminated area at time t, in mg / L; it can be determined based on the ratio between the total injection volume Q of the treatment agent and the total volume V of the aquifer as of time t.

[0117] v is the injection speed of the treatment agent, in m / s;

[0118] P is the treatment agent injection pressure, in Pa.

[0119] According to the feedback of the objective function, v and P are adjusted by an optimization algorithm (such as the gradient descent method) so that the deviation between the concentration of the treatment agent at any point in the groundwater of the contaminated area at time t and the target average concentration of the treatment agent in the groundwater of the contaminated area at time t is gradually reduced;

[0120] Step 4.4, performing iterative convergence processing on the objective function until the set stop condition is met and then stopping the iteration, outputting the injection parameters that meet the stop condition as the preferred injection parameters, and obtaining 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 in the contaminated area at time t and the target average concentration of the treatment agent in the groundwater in the contaminated area at time t is less than or equal to 2%.

[0122] The stop condition is used to determine whether the optimization has reached a stable state and avoid unnecessary iterative adjustments. After the stop condition is met, the concentration distribution is considered to have reached a uniform state and further adjustments are stopped.

[0123] Step 4.5, adjust the current injection parameters to the preferred injection parameters, apply them to the actual injection process, and continue to set dynamic monitoring and adjustment to ensure the actual effect; continue to inject the treatment agent, and in the process of continuing to inject the treatment agent, use the flow meter and pressure sensor to monitor the current injection speed and injection pressure in real time to ensure that they are consistent with the optimization result, set the deviation threshold in the real-time monitoring concentration process, and judge in real time whether the deviation between the treatment agent concentration at any point in the groundwater in the contaminated area at time t and the target average concentration of the treatment agent in the groundwater in the contaminated area at time t exceeds the set deviation threshold. If so, return to step 4.4 and trigger a new iterative optimization process to readjust the injection parameters to ensure the uniformity of the concentration distribution and ensure timely response when the deviation exceeds the acceptable range; if not, enter step 4.6 after reaching the total injection amount of the treatment agent;

[0124] Specifically, the deviation threshold value 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. The groundwater to be treated is wastewater containing heavy metals. After preliminary investigation, the pollutants are mainly concentrated in the aquifers 20 to 50 meters underground, and the main pollutant is lead (Pb). Deep well reinjection technology is needed for environmental remediation. Since the pollutant is lead, sodium sulfide (Na 2 S) As a treatment agent, sodium sulfide is low-cost and can ensure the sustainability of the remediation process.

[0128] In this application example, through real-time monitoring and confirmation, the method disclosed in Example 1 ensures the uniform distribution of the treatment agent in the aquifer, and after the reinjection is completed, through sampling and testing, it is determined that the Pb content in the groundwater in the contaminated area is significantly reduced and is evenly distributed at different locations, indicating 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 implementation process is only an example for clearly explaining the present application, and is not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of this application.

Claims

1. An environmental remediation method using deep well reinjection to purify groundwater, characterized in that: The following steps are involved: Step 1: Obtain hydrogeological parameters and pollutant parameters of the groundwater contaminated area, wherein the pollutant parameters include pollutant types; Step 2: Based on the hydrogeological parameters and pollutant parameters, determine the treatment agent parameters, wherein the treatment agent parameters include the treatment agent type, the reaction rate between the treatment agent and the pollutant, and the total injection amount of the treatment agent; Step 3: construct a deep well reinjection well in the groundwater contaminated area to communicate with the aquifer, and install a flow meter, a flow rate sensor and a pressure sensor in the reinjection well, wherein 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 rate sensor is used to measure the flow rate of the treatment agent; Step 4: Complete deep well reinjection of treatment agent, which specifically includes the following sub-steps: Step 4.1, establishing a treatment agent diffusion model based on the parameters obtained in step 1 and the reaction rate between the treatment agent and the pollutant determined in step 2; Step 4.2, based on the treatment agent diffusion model, construct an objective function with the goal 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, initializing injection parameters, wherein the injection parameters include treatment agent injection speed and treatment agent injection pressure; Step 4.4, performing iterative convergence processing on the objective function until the set stop condition is met, and then stopping the iteration, and outputting the injection parameters that meet the stop condition as the preferred injection parameters; Step 4.5, adjusting the injection parameters at the current moment to the preferred injection parameters, continuing to inject the treatment agent, and in the process of continuing to inject the treatment agent, judging in real time whether the deviation between the treatment agent concentration at any point in the groundwater in the contaminated area at time t and the target average concentration of the treatment agent in the groundwater in the contaminated area at time t exceeds the set deviation threshold, if so, returning to step 4.4; if not, entering step 4.6 after reaching the total injection amount of the treatment agent determined in step 2; Step 4.6, end the injection.

2. The environmental remediation method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: The pollutant types include organic pollutants, heavy metal pollutants and nutrient pollutants.

3. The environmental remediation method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: When the pollutants are organic pollutants, bioremediation agents are used as reinjection treatment agents; when the pollutants are heavy metal pollutants, chemical precipitants are used as reinjection treatment agents; when the pollutants are nutrient pollutants, adsorbents are used as reinjection treatment agents.

4. The environmental restoration method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: The bioremediation agent is selected from one or more of Desulfovibrio, Pseudomonas, laccase and peroxidase; the chemical precipitant is selected from one or more of sodium sulfide, calcium hydroxide, phosphate, calcium sulfide and iron salt; 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 as claimed in claim 1, characterized in that: The treatment agent diffusion model is as follows: Where: C(v,P,x,y,z,t) is the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mol / m 3 ; f(v,P,x,y,z,t) is the velocity field function; ɑ is the adjustment term coefficient; R(C(v,P,x,y,z,t)) is the reaction rate between the treatment agent and the pollutant at time t; D is the diffusion coefficient of the treatment agent; v is the injection speed of the treatment agent, in m / s; P is the treatment agent injection pressure, in Pa.

6. The environmental restoration method for purifying groundwater by deep well reinjection as claimed in claim 5, characterized in that: The adjustment term coefficient α is determined by the following formula: Where: φ is soil porosity; K is soil permeability; k is an empirical constant.

7. The environmental restoration method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: The objective function is as follows: In the formula, V is the total volume of groundwater in the contaminated area, in m 3 ; C(v,P,x,y,z,t) is the concentration of the treatment agent at any point in the groundwater within the contaminated area at time t, in mg / L; is the target average concentration of the treatment agent in the groundwater of the contaminated area at time t, in mg / L; v is the injection speed of the treatment agent, in m / s; P is the treatment agent injection pressure, in Pa.

8. The environmental restoration method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: The total injection amount of the treatment agent described in step 2 is determined by the following formula: Q=Mβ Where: Q is the total injection amount of treatment agent, in mg; M is the total amount of pollutants, in mg; β is the reaction ratio of the treatment agent to the pollutant.

9. The environmental restoration method for purifying groundwater by deep well reinjection as claimed 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 in the contaminated area at time t and the target average concentration of the treatment agent in the groundwater in the contaminated area at time t is less than or equal to 2%.

10. The environmental restoration method for purifying groundwater by deep well reinjection as claimed in claim 1, characterized in that: The deviation threshold described in step 4.5 is 4-6%.

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