Chemical remediation analysis method to monitor soil and groundwater pH in remediation areas

Abstract

The present invention belongs to the field of soil pollution remediation, and specifically relates to a chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in a remediation area. The method comprises the following steps: uniformly arranging monitoring points in the remediation area, and injecting a configured agent into the soil at each monitoring point according to a set step remediation time interval. Then, a suitable remediation interval is determined based on an evaluation of the remediation state after each injection. Thus, the effect verification of the remediation state is achieved by collecting remediation data at different remediation time intervals. The suitable remediation interval obtained based on this is more suitable for the remediation needs of the remediation area. At the same time, after the agent is injected at each monitoring point, not only is the remediation state evaluated, but also the monitoring of the pH value of soil and groundwater is added. Thus, the remediation effect, the soil performance maintenance and the pH value of soil and groundwater are correlated and compared, and the suitable pH value of soil and groundwater is determined, which is helpful to adjust the agent formula and ensure the optimization of the remediation effect.

Description

Technical Field

[0001] The invention belongs to the field of soil pollution remediation, and in particular relates to a chemical remediation analysis method capable of monitoring pH values ​​of soil and groundwater in a remediation area. Background Art

[0002] Along with the process of urbanization, industry, construction, and urban transportation have polluted the soil, causing the soil quality to decline, which has seriously affected the economic value of the land where the polluted soil is located. Therefore, it is very necessary to remediate the polluted soil.

[0003] Chemical oxidation technology is a commonly used technology for contaminated soil remediation. It achieves the purpose of pollution remediation by mixing oxidants with contaminated soil and allowing the oxidants to directly oxidize and degrade pollutants in the soil. Persulfate is the most commonly used oxidant. However, after oxidants oxidize and degrade pollutants, secondary products such as sulfuric acid and hydrochloric acid will be generated. If the secondary products are not treated, the strong acid will destroy the soil structure, making it impossible to achieve the remediation goal in the remediation area.

[0004] In response to the above problems, the activation method of persulfate is now changed to strong alkali activation, which can effectively neutralize the secondary product strong acid and reduce the subsequent acidification soil disposal process. However, strong alkali may significantly increase the pH of soil groundwater, thereby changing the physical and chemical properties of the soil. Excessive alkalization may have a negative impact on the repaired soil structure and ecosystem. Therefore, when using strong alkali activation, it is necessary to pay attention to the appropriate pH.

[0005] In addition, when using oxidizing agents to repair contaminated soil, it is not necessary to add enough agents all at once, but to follow the principle of adding small amounts multiple times to effectively control the rate and extent of the redox reaction, thereby avoiding over-treatment or incomplete treatment. This involves the setting of the repair interval, but the repair interval is currently fixed based on historical experience, which makes it impossible to evaluate and verify the effect of the setting, and there is a hidden danger of unreasonable settings. This unreasonableness is reflected in the fact that when the setting time is too long, it may delay the effective removal of pollutants and cause a waste of time in the repair process. When the setting time is too short, the oxidizing agent may not be able to fully play its role, which will not only affect the repair effect, but also cause the intermediate products to continue to accumulate in the soil or be released into the surrounding environment, increasing environmental risks and failing to maximize the optimization of repair effects and resource utilization. Summary of the invention

[0006] To this end, one purpose of an embodiment of the present application is to provide a chemical remediation analysis method that can monitor the pH value of soil and groundwater in the remediation area, effectively solving the problems mentioned in the background technology.

[0007] The purpose of the present invention can be achieved through the following technical scheme: a chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area comprises the following steps: extracting the types and concentrations of pollutants from the pollution investigation records of the remediation area.

[0008] The ratio of oxidant to alkaline activator is determined based on the type and concentration of pollutants in the remediation area.

[0009] Several monitoring points are evenly distributed in the restoration area, and the initial pollutant concentration, initial secondary product concentration and initial soil physical and chemical indicators are collected at each monitoring point.

[0010] A step repair interval is set at each monitoring point, whereby the prepared agent is injected into the soil at each monitoring point through an injection device according to the set step repair time interval.

[0011] After a set period of time after injection, the pollutant concentration, secondary product concentration, soil physical and chemical indicators, and soil and groundwater pH of each monitoring point are collected to analyze the remediation effect and soil performance maintenance of each monitoring point after injection.

[0012] The trial restoration monitoring period is determined, thereby obtaining the restoration effect and soil performance maintenance of each monitoring point after each injection during the trial restoration monitoring period, and based on this, the restoration quality coefficient of each monitoring point after each injection is evaluated.

[0013] With the injection time as the horizontal axis and the repair quality coefficient as the vertical axis, a repair quality change curve for each monitoring point at the corresponding repair interval was constructed, and the appropriate repair interval was then determined.

[0014] The restoration effect of each monitoring point after each injection, the maintenance of soil performance and the pH value of soil and groundwater are correlated and compared to determine the appropriate pH value of soil and groundwater.

[0015] After the trial restoration monitoring period, pollution restoration shall be carried out according to the appropriate restoration interval and the appropriate soil and groundwater pH.

[0016] In combination with all the above-mentioned technical solutions, the positive effects of the present invention are as follows: 1. The present invention evenly arranges monitoring points in the restoration area, and injects the configured agent into the soil of each monitoring point according to the set step restoration time interval, and then determines the appropriate restoration interval duration based on the evaluation of the restoration status after each injection, thereby realizing the effect verification of the restoration status by collecting restoration data at different restoration time intervals. The appropriate restoration interval duration obtained based on this is more adapted to the restoration needs of the restoration area, and is more scientific and reasonable, thereby greatly avoiding the unreasonable hidden dangers of fixedly setting the restoration interval duration, and is conducive to the dual guarantee of restoration effect and resource utilization.

[0017] 2. The present invention evaluates the remediation status after injecting the agent at each monitoring point from two dimensions: pollution remediation effect and maintenance of soil physical and chemical properties. This helps to provide a two-way impact assessment of the agent on the contaminated soil and provides comprehensive and reliable data support for determining the appropriate remediation interval.

[0018] 3. After injecting the agent at each monitoring point, the present invention not only evaluates the restoration status but also adds the monitoring of the pH of the soil and groundwater. The restoration effect of each monitoring point after each injection, the maintenance of soil performance and the pH of the soil and groundwater are correlated and compared to determine the appropriate pH of the soil and groundwater. This method provides a scientific and effective direction for determining the appropriate pH in the contaminated soil restoration process by utilizing the correlation between pH and the restoration effect and the maintenance of soil performance, which helps to adjust the agent formula to minimize the adverse effects on the physical and chemical properties of the soil while ensuring the optimization of the restoration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0020] Figure 1 The present invention is a flowchart of the steps for implementing the method.

[0021] Figure 2 This is a schematic diagram for selecting the inner diameter of the repair circle in the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 As shown, the present invention proposes a chemical remediation analysis method that can monitor the pH value of soil and groundwater in the remediation area, including the following steps: extracting pollutant types and pollutant concentrations from the pollution investigation records of the remediation area.

[0024] In the specific implementation of the above scheme, the types of pollutants include but are not limited to petroleum compounds, chlorinated hydrocarbons, chlorobenzene compounds, phenolic compounds, etc. These pollutants can increase the redox reaction in the soil through oxidants, promote the degradation of these organic pollutants, and decompose them into more harmless or more easily degradable products.

[0025] The ratio of oxidant to alkaline activator is determined based on the type and concentration of pollutants in the remediation area.

[0026] In the embodiment applied to the above scheme, the oxidant can be selected from permanganate, persulfate, and persulfate is commonly used, and the alkaline activator can be selected from liquid caustic soda, flake caustic soda, etc.

[0027] Further applied to the above scheme, the ratio of the oxidant to the alkaline activator can be selected by referring to historical restoration records to select the ratio used in the restoration of pollutant types and pollutant concentrations similar to those in the current restoration area.

[0028] In another embodiment, the ratio of the oxidant to the alkaline activator can be tested on a small scale in a laboratory to simulate the treatment process of contaminated soil or groundwater to determine the optimal ratio of the oxidant to the alkaline activator.

[0029] Several monitoring points are evenly distributed in the restoration area, and the initial pollutant concentration, initial secondary product concentration and initial soil physical and chemical indicators are collected at each monitoring point. For example, the secondary products may be sulfuric acid, hydrochloric acid, etc., and the soil physical and chemical indicators may be organic matter content, electrical conductivity, porosity, etc.

[0030] In the preferred implementation of the above scheme, a number of monitoring points are evenly arranged in the repair area. The specific implementation is as follows: the center point of the repair area is taken as the repair point, and a trial repair circle is formed with the repair point as the center and the set distance as the radius, and four diameters with the same interval angles in the horizontal, vertical and oblique directions are taken in the repair circle. The "oblique" here can be understood as starting from a point inside the circle, and the line connecting the center of the circle presents the same angle as the horizontal and vertical directions, see Figure 2 shown.

[0031] It should be noted that taking four diameters in different directions within the repair circle for drug diffusion detection can ensure that different parts of the entire repair circle are covered. This helps to fully understand the diffusion of the drug in the entire area, rather than just being limited to data in a single direction or position.

[0032] Take an appropriate amount of the prepared agent to add markers, and inject the agent with added markers at the trial repair point. After the injection, perform marker detection in real time along the diameter line starting from the center of the circle on each diameter, and then stop detecting when no markers are detected. At the same time, mark the positions where detection is stopped. These positions mark the boundaries of the agent or the edges of the diffusion range, and record the time when detection is stopped.

[0033] It should be understood that the marker can be a pigment or a radioactive isotope. Adding a marker to the prepared agent can track its movement and diffusion path in the soil after injection. This method can infer the diffusion range of the agent by directly measuring the distribution of the marker. On the one hand, real-time data can be obtained without waiting for feedback from an independent tracking process or equipment. On the other hand, because the marker is directly involved in the agent, its distribution data can provide a finer spatial and temporal resolution. On the other hand, no additional equipment or complex monitoring system is required, thus saving costs and resources, and providing fast, accurate and cost-effective tracking of the spread of the agent.

[0034] In the example values ​​of the above scheme, marker detection can be carried out by sampling and analyzing the soil or using geophysical methods (such as ground resistivity, radioactivity measurement, etc.).

[0035] The distance between the stop detection position and the center of the circle on each diameter is measured, and the farthest distance is taken as the diffusion distance of the drug.

[0036] It should be explained that the farthest distance is chosen as the diffusion distance of the agent because the farthest detection stop point represents the farthest distance the agent moves in the soil, reflecting the maximum diffusion range that the agent may reach in the actual environment. The remediation process is to cover and treat the contaminated area as much as possible. Therefore, it is necessary to understand the maximum range that the agent can effectively cover in order to evaluate the extent of the remediation effect.

[0037] A circle is drawn with the repair point as the center and the diffusion distance of the agent as the radius to obtain the diffusion range of the agent.

[0038] In the repair area, monitoring points are arranged based on the shape and contour of the repair area and the diffusion range of the agent.

[0039] The present invention arranges a number of monitoring points in the restoration area based on the diffusion range of the agent, which can ensure to the greatest extent that the agent diffusion paths between adjacent monitoring points will not cross and overlap, thereby ensuring that the restoration data obtained by monitoring the agent injected at each monitoring point is true and reliable, which can minimize the source of error and ensure that the monitoring results accurately reflect the progress of environmental restoration. At the same time, it also makes the data between different monitoring points easier to compare and interpret. This consistent monitoring layout can provide a consistent data set, which is helpful to evaluate the consistency of governance effects and progress. In addition, by ensuring the non-overlapping layout of the agent diffusion paths, unnecessary repeated monitoring and waste of resources are avoided.

[0040] A step repair interval is set at each monitoring point, whereby the prepared agent is injected into the soil at each monitoring point through an injection device according to the set step repair time interval.

[0041] As a specific implementation of the above scheme, the step-by-step repair interval is set at each monitoring point as follows: the number of monitoring points installed is counted, and the duration of the trial repair monitoring period is divided into levels according to the fraction of the number of monitoring points installed, to obtain the repair frequency corresponding to each level.

[0042] It should be pointed out that the trial restoration monitoring period is based on the reaction cycle of the agent in the soil. The reaction cycle of the restoration area can be predicted based on historical restoration records, and then one-third of the reaction cycle can be taken as the trial restoration monitoring period to reflect the restoration effect in stages, while also providing time and space for subsequent adjustments.

[0043] Exemplarily, assuming that the duration of the trial repair monitoring period is 10 days and the number of monitoring points is 5, there are 5 divided levels, and each monitoring point corresponds to one divided level. Then the number of monitoring points is taken as the basis for level division. At this time, the repair frequency corresponding to the first level is 10 divided by 5, which is equal to 2 times, the repair frequency corresponding to the second level is 4 times, the repair frequency corresponding to the third level is 6 times, the repair frequency corresponding to the fourth level is 8 times, and the repair frequency corresponding to the fifth level is 10 times. In this case, the repair frequency corresponding to the first level is a bit too small, which will not provide sufficient data support for the subsequent construction of the repair quality change curve. At this time, half of the number of monitoring points can be taken as the basis for level division. In this case, the repair frequency corresponding to the first level is 10 divided by 2.5, which is equal to 4 times, the repair frequency corresponding to the second level is 8 times, the repair frequency corresponding to the third level is 10 times, the repair frequency corresponding to the fourth level is 12 times, and the repair frequency corresponding to the fifth level is 14 times.

[0044] The repair frequency corresponding to each level is combined with the duration of the trial repair monitoring period to obtain the repair interval duration corresponding to each level.

[0045] In a specific operation, the duration of the trial repair monitoring period is divided by the repair frequency corresponding to each level to obtain the repair interval duration corresponding to each level.

[0046] The corresponding relationship between the deployed monitoring points and the steps is set, thereby obtaining the repair interval duration corresponding to each monitoring point.

[0047] After a set period of time after injection, the pollutant concentration, secondary product concentration, soil physical and chemical indicators, and soil and groundwater pH of each monitoring point are collected to analyze the remediation effect and soil performance maintenance of each monitoring point after injection.

[0048] The set time mentioned above is the interval between the stop detection time and the injection time of the trial repair point on the diameter with the longest distance between the stop detection position and the center of the circle on each diameter. The agent injected during this time can achieve effective diffusion. If the repair data monitoring is carried out immediately after the injection of the agent, the agent has not had time to diffuse at this time. The repair data obtained at this time may only reflect the moment when the agent was just injected, and fail to capture the distribution and diffusion of the agent in the soil, making it difficult to accurately evaluate the repair effect, which may lead to misjudgment or incomplete understanding of the repair effect, and also waste resources and time.

[0049] The trial restoration monitoring period is determined, thereby obtaining the restoration effect and soil performance maintenance of each monitoring point after each injection during the trial restoration monitoring period, and based on this, the restoration quality coefficient of each monitoring point after each injection is evaluated.

[0050] Preferably, the restoration effect of each monitoring point after injection is analyzed by referring to the following process: the pollutant concentration and secondary product concentration collected at each monitoring point after the first injection are respectively subtracted from the initial pollutant concentration and initial secondary product concentration to obtain the pollutant concentration contrast difference and the initial secondary product concentration difference.

[0051] The pollutant concentration and secondary product concentration at each monitoring point after subsequent injection are subtracted from the pollutant concentration and secondary product concentration after the previous injection to obtain the pollutant concentration comparison difference and the initial secondary product concentration difference.

[0052] Based on the contrast difference of pollutant concentrations at each monitoring point after injection and the difference in initial secondary product concentrations, the remediation effect coefficient of each monitoring point after injection is calculated. The specific calculation formula is: Where △Q PO , △Q SP They represent the pollutant concentration contrast difference and initial secondary product concentration difference of the monitoring point after injection, respectively. PO , Q SP They respectively represent the pollutant concentration and secondary product concentration of the monitoring point after injection, U represents the set constant, and U>1. For example, U=3. From the above formula, it can be seen that the smaller the pollutant concentration and initial secondary product concentration after injection are compared with the pollutant concentration and initial secondary product concentration of the previous injection, the better the pollution is improved and the better the remediation effect is.

[0053] Further preferably, the soil performance maintenance status is analyzed as follows: the soil physicochemical indicators collected at each monitoring point after the first injection are subtracted from the initial soil physicochemical indicators to obtain the soil physicochemical indicator contrast difference.

[0054] The soil physicochemical indicators of each monitoring point after subsequent injection were subtracted from those after the previous injection to obtain the soil physicochemical indicator contrast difference.

[0055] The soil performance maintenance coefficient of each monitoring point after injection is calculated based on the contrast difference of soil physical and chemical indicators at each monitoring point after injection. The specific calculation formula is: Where △W i It indicates the contrast difference of the soil physical and chemical index of the monitoring point after injection, i indicates the soil physical and chemical index number, i=1,2,……,n, W i It represents the value of the ith soil physical and chemical indicator collected at the monitoring point after injection, and e represents the natural constant. From this formula, it can be seen that the smaller the contrast difference of soil physical and chemical indicators after injection, the smaller the fluctuation of soil physical and chemical indicators and the better the maintenance of soil performance.

[0056] Still further preferably, the evaluation of the restoration quality coefficient of each monitoring point after each injection refers to the following process: the restoration effect coefficient and the soil performance maintenance coefficient of each monitoring point after each injection are weighted averaged to obtain the restoration quality coefficient of each monitoring point after each injection, wherein the weight coefficients corresponding to the restoration effect coefficient and the soil performance maintenance coefficient are 0.6 and 0.4, respectively.

[0057] A two-dimensional coordinate system is constructed with the injection time as the horizontal axis and the repair quality coefficient as the vertical axis. Several points are marked in the constructed two-dimensional coordinate system for the injection time and the repair quality coefficient of each injection at each monitoring point during the trial repair monitoring period, to form a repair quality change curve for each monitoring point at the corresponding repair interval, and then determine the appropriate repair interval duration, which is specifically determined as follows: an inflection point is marked on the repair quality change curve for each monitoring point at the corresponding repair interval, where the inflection point is a point where the slope changes.

[0058] Based on the marked inflection points, the repair quality change curve is divided into an ascending segment, a descending segment, and a flat segment, and then the proportion of the ascending segment, the amplitude of the ascending segment, and the continuity of the ascending segment are counted. Based on the proportion of the ascending segment, the amplitude of the ascending segment, and the continuity of the ascending segment, the advantage of the repair quality change is calculated. Specifically, the proportion of the ascending segment, the amplitude of the ascending segment, and the continuity of the ascending segment can be accumulated to obtain the advantage of the repair quality change.

[0059] Specifically, the rising segment amplitude and the rising segment continuity statistics are as follows: the slope of each rising segment in the repair quality change curve is obtained, and the rising segment amplitude is obtained by average calculation.

[0060] The ascending segment, descending segment and flat segment obtained by dividing the repair quality change curve are numbered sequentially from front to back according to their positions, and the number of the ascending segment is extracted from them.

[0061] Compare the numbers of each rising segment in the repair quality change curve, extract the maximum and minimum numbers, and import them into the formula Where S max , S minThey represent the maximum and minimum numbers of the ascending segments respectively, and k represents the number of ascending segments.

[0062] It should be understood that the reason why the proportion of rising segments, the amplitude of rising segments and the continuity of rising segments in the restoration quality change curve corresponding to each monitoring point are used as the basis for evaluating the advantages of restoration quality is that these indicators comprehensively consider the changing trends at different stages of the restoration process, rather than just focusing on a certain time point of the restoration effect. By considering the proportion, amplitude and continuity of rising segments, the overall dynamic changes of restoration quality can be more comprehensively evaluated, thereby more accurately reflecting the restoration quality. In addition, the proportion, amplitude and continuity of rising segments are relatively objective and quantifiable indicators, which can provide a basis for comparing the restoration quality of different monitoring points. This method helps to standardize the evaluation method and improve the comparability and scientificity of the evaluation results.

[0063] The repair quality change dominances corresponding to the repair quality change curves of each monitoring point under the corresponding repair interval duration are compared, and the repair interval duration corresponding to the maximum repair quality change dominance is selected as the appropriate repair interval duration.

[0064] The restoration effect of each monitoring point after each injection, the maintenance of soil performance and the pH of soil and groundwater are correlated and compared to determine the appropriate pH of soil and groundwater, which is determined as follows: the restoration effect coefficient of each monitoring point after each injection is compared with the pre-set standard restoration effect coefficient. If the restoration effect coefficient of a monitoring point after a certain injection reaches the standard restoration effect coefficient, then the injection will be recorded as an effective restoration injection.

[0065] The pH values ​​of soil and groundwater effectively injected at each monitoring point during each restoration constitute the optimal restoration pH range corresponding to each monitoring point.

[0066] The soil performance maintenance coefficient of each monitoring point after each injection is compared with the pre-set standard soil performance maintenance coefficient, and the effective performance injection is obtained in the same way.

[0067] As an example, the above-mentioned standard remediation effect coefficient and standard soil performance maintenance coefficient can be 0.8.

[0068] The pH values ​​of soil and groundwater at each monitoring point during each effective performance injection constitute the optimal pH range of the performance corresponding to each monitoring point.

[0069] The intersection operation of the restoration preferred pH range corresponding to the monitoring point to which the suitable restoration interval duration belongs and the performance preferred pH range is performed to obtain the suitable soil and groundwater pH.

[0070] It should be noted that the pH obtained by performing the intersection operation of the preferred pH range for restoration and the preferred pH range for performance can be a single data or multiple data. When it is a single data, the data is used as the suitable pH of soil and groundwater. When it is multiple data, any one of them is used as the suitable pH of soil and groundwater, or an interval is formed to form a suitable pH range for soil and groundwater.

[0071] After injecting the agent at each monitoring point, the present invention not only conducts a restoration status assessment but also adds monitoring of the pH of the soil and groundwater. Thus, the restoration effect of each monitoring point after each injection, the maintenance of soil performance and the pH of the soil and groundwater are correlated and compared to determine the appropriate pH of the soil and groundwater. This method provides a scientific and effective direction for determining the appropriate pH in the contaminated soil restoration process by utilizing the correlation between pH and the restoration effect and the maintenance of soil performance, which helps to adjust the agent formula to minimize the adverse effects on the physical and chemical properties of the soil while ensuring the optimization of the restoration effect.

[0072] After the trial restoration monitoring period, pollution restoration shall be carried out according to the appropriate restoration interval and the appropriate soil and groundwater pH.

[0073] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area, characterized in that: The following steps are involved: Extract pollutant types and concentrations from pollution survey records in the remediation area; Determine the ratio of oxidant to alkaline activator based on the type and concentration of pollutants in the remediation area; Several monitoring points are evenly distributed in the restoration area, and the initial pollutant concentration, initial secondary product concentration and initial soil physical and chemical indicators are collected at each monitoring point; The step repair interval is set at each monitoring point, so that the prepared agent is injected into the soil of each monitoring point through the injection device according to the set step repair time interval; After a set period of time after injection, the pollutant concentration, secondary product concentration, soil physical and chemical indicators, soil and groundwater pH of each monitoring point are collected to analyze the restoration effect of each monitoring point after injection and the maintenance of soil performance; Determine the trial restoration monitoring period, thereby obtaining the restoration effect and soil performance maintenance of each monitoring point after each injection during the trial restoration monitoring period, and based on this, evaluate the restoration quality coefficient of each monitoring point after each injection; With injection time as the horizontal axis and repair quality coefficient as the vertical axis, a repair quality change curve of each monitoring point under the corresponding repair interval is constructed, and then the appropriate repair interval is determined; The restoration effect of each monitoring point after each injection, the maintenance of soil performance and the pH value of soil and groundwater were correlated and compared to determine the appropriate pH value of soil and groundwater; After the trial restoration monitoring period, pollution restoration shall be carried out according to the appropriate restoration interval and the appropriate soil and groundwater pH.

2. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area according to claim 1, characterized in that: The specific implementation of evenly distributing a number of monitoring points in the restoration area is as follows: Take the center point of the repair area as the repair point, and form a repair circle with the repair point as the center and the set distance as the radius, and take four diameters with the same interval angle in the horizontal, vertical and oblique directions within the repair circle; Take an appropriate amount of the prepared agent to add a marker, and inject the agent with the marker at the trial repair point. After the injection, perform real-time marker detection along the diameter line starting from the center of the circle on each diameter, and then stop the detection when the marker cannot be detected. At the same time, mark the stop detection position and record the stop detection time; Measure the distance between the stop detection position and the center of the circle on each diameter, and then take the farthest distance as the diffusion distance of the drug; Draw a circle with the repair point as the center and the diffusion distance of the agent as the radius to obtain the diffusion range of the agent; In the repair area, monitoring points are arranged based on the shape and contour of the repair area and the diffusion range of the agent.

3. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area as claimed in claim 2, characterized in that: The set time after injection is the interval between the stop detection time and the injection time of the trial repair point on the diameter with the farthest distance between the stop detection position and the center of the circle on each diameter.

4. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area according to claim 1, characterized in that: The step repair interval duration is set at each monitoring point as follows: The number of monitoring points deployed is counted, and the duration of the trial repair monitoring period is divided into levels according to the fraction of the number of monitoring points deployed to obtain the repair frequency corresponding to each level; The repair frequency corresponding to each level is combined with the duration of the trial repair monitoring period to obtain the repair interval duration corresponding to each level; The corresponding relationship between the deployed monitoring points and the steps is set, thereby obtaining the repair interval duration corresponding to each monitoring point.

5. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area according to claim 1, characterized in that: The analysis of the repair effect of each monitoring point after injection is shown in the following process: The pollutant concentration and secondary product concentration collected at each monitoring point after the first injection are respectively subtracted from the initial pollutant concentration and initial secondary product concentration to obtain the pollutant concentration contrast difference and initial secondary product concentration difference; The pollutant concentration and secondary product concentration of each monitoring point after subsequent injection are respectively subtracted from the pollutant concentration and secondary product concentration after the previous injection to obtain the pollutant concentration comparison difference and the initial secondary product concentration difference; Based on the contrast difference of pollutant concentrations at each monitoring point after injection and the difference in initial secondary product concentrations, the remediation effect coefficient of each monitoring point after injection is calculated. The specific calculation formula is: Where ΔQ PO , ΔQ SP They represent the pollutant concentration contrast difference and initial secondary product concentration difference of the monitoring point after injection, respectively. PO , Q SP They represent the pollutant concentration and secondary product concentration at the monitoring point after injection respectively, U represents the set constant, and U>1.

6. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area as claimed in claim 5, characterized in that: The soil performance maintenance analysis is as follows: The soil physical and chemical indicators collected at each monitoring point after the first injection were subtracted from the initial soil physical and chemical indicators to obtain the soil physical and chemical indicator comparison difference; The soil physical and chemical indicators of each monitoring point after subsequent injection are subtracted from the soil physical and chemical indicators after the previous injection to obtain the soil physical and chemical indicator comparison difference; The soil performance maintenance coefficient of each monitoring point after injection is calculated based on the contrast difference of soil physical and chemical indicators at each monitoring point after injection. The specific calculation formula is: where ΔW i It indicates the contrast difference of the soil physical and chemical index of the monitoring point after injection, i indicates the soil physical and chemical index number, i=1,2,......,n, W i It represents the value of the ith soil physical and chemical indicator collected at the monitoring point after injection, and e represents the natural constant.

7. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area according to claim 6, characterized in that: The evaluation of the repair quality coefficient of each monitoring point after each injection refers to the following process: The restoration effect coefficient and soil performance maintenance coefficient of each monitoring point after each injection were weighted averaged to obtain the restoration quality coefficient of each monitoring point after each injection.

8. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area as claimed in claim 1, characterized in that: The process of determining the appropriate repair interval is as follows: Mark the inflection point on the restoration quality change curve at each monitoring point at the corresponding restoration interval; The restoration quality change curve is divided into rising segment, falling segment and flat segment based on the marked inflection points, and then the proportion of rising segment, the amplitude of rising segment and the continuity of rising segment are counted, and the dominance of restoration quality change is counted based on the proportion of rising segment, the amplitude of rising segment and the continuity of rising segment; The repair quality change dominances corresponding to the repair quality change curves of each monitoring point under the corresponding repair interval duration are compared, and the repair interval duration corresponding to the maximum repair quality change dominance is selected as the appropriate repair interval duration.

9. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area as claimed in claim 8, characterized in that: The statistics of the rising segment amplitude and the rising segment continuity are as follows: Obtain the slope of each rising segment in the repair quality change curve, and perform mean calculation to obtain the amplitude of the rising segment; The ascending segment, descending segment and flat segment obtained by dividing the repair quality change curve are numbered sequentially from front to back according to their positions, and the number of the ascending segment is extracted from them; Compare the numbers of each rising segment in the repair quality change curve, extract the maximum and minimum numbers, and import them into the formula Where S max , S min They represent the maximum and minimum numbers of the ascending segments respectively, and k represents the number of ascending segments.

10. The chemical remediation analysis method capable of monitoring the pH value of soil and groundwater in the remediation area according to claim 6, characterized in that: The suitable soil and groundwater pH is determined as follows: Compare the repair effect coefficient of each monitoring point after each injection with the preset standard repair effect coefficient. If the repair effect coefficient of a monitoring point after a certain injection reaches the standard repair effect coefficient, then the injection is recorded as an effective repair injection. The pH values ​​of soil and groundwater effectively injected at each monitoring point during each restoration constitute the appropriate pH range for restoration corresponding to each monitoring point; Compare the soil performance maintenance coefficient of each monitoring point after each injection with the pre-set standard soil performance maintenance coefficient, and similarly obtain the effective injection performance; The pH value of soil and groundwater at each monitoring point during each effective performance injection constitutes the performance suitable pH range corresponding to each monitoring point; The suitable pH value of soil and groundwater is obtained by performing an intersection operation on the suitable pH value range of restoration corresponding to the monitoring point to which the suitable restoration interval duration belongs and the suitable pH value range of performance.

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