A method for tracing groundwater pollution

Abstract

The present application relates to groundwater pollution traceability method technical field, specifically speaking, a kind of groundwater pollution traceability method, comprising the following steps: pollution source information collection, groundwater region is divided into M regions;Pollution information is analyzed and stored;Groundwater sampling analysis;Second traceability, when the groundwater information collected in step S3 and the pollution information in step S2 cannot be matched, traceability fails, stable isotope eigenvalue, three-dimensional fluorescence water quality fingerprint and other traceability means are used to determine groundwater pollution source;Before groundwater pollution occurs, the information of each pollution source can be obtained, and the migration and diffusion simulation process of pollutants in groundwater is described, each pollution source is registered, and a groundwater pollution prevention program can be developed according to the recorded data, which facilitates the rapid identification of pollution sources after groundwater pollution occurs, and improves the traceability efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of groundwater pollution tracing method, in particular to a groundwater pollution tracing method. BACKGROUND

[0002] Groundwater is an important part of water resources, due to its stability, good quality and wide distribution, it is one of the important water sources for agricultural irrigation, industrial production and urban life. Identifying groundwater pollution sources, controlling and reducing pollution sources from the source is an important foundation for groundwater pollution prevention and control. Because groundwater is stored in the rock voids below the ground, the flow rate is slow, making groundwater pollution have strong concealment, complexity and hysteresis. In addition, the multi-source and diversity of life pollution, industrial pollution and agricultural pollution also bring challenges to the identification of groundwater pollution sources.

[0003] Groundwater pollution tracing is to find out the location of the pollution source and the history of the migration and transformation of the pollutant through limited observation data, which is the first step of groundwater pollution control. The current pollution tracing method mainly includes: after the occurrence of groundwater pollution, sampling and monitoring in the pollution area, comparing the data of pollutant concentration, isotope characteristic value and three-dimensional fluorescence water quality fingerprint, and analyzing the groundwater pollution source. This method has the problem of low tracing efficiency, and does not have the effect of preventing each region, the informatization degree of the region with groundwater pollution risk is poor, and it is difficult to accurately trace the source. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a groundwater pollution tracing method.

[0005] The technical scheme adopted by the present application to solve its technical problems is: a groundwater pollution tracing method, comprising the following steps:

[0006] S1: collecting pollution source information, dividing the groundwater area into M regions, taking each potential pollution source that may cause pollution as a region, marking each region as M g , determining the center coordinates (x i , y i ) of the pollution source region, collecting the pollution source information of the region and the matched pollutant substance with water pollution risk, determining the pollution index P j and the pollutant migration and diffusion parameter, so as to focus on sample detection in the region with large pollution risk;

[0007] Wherein x i is the horizontal coordinate of the region, y i is the vertical coordinate of the region, i is an integer greater than or equal to 1; j is an integer greater than or equal to 1; g is an integer greater than or equal to 1;

[0008] S2: analyze and store the pollution information; store the regional marker information M g , coordinates (x i , y i ) information, pollution index P j information and pollution migration and diffusion information through the MapReduce model; at the same time, various types of groundwater pollution remediation technology processes are stored;

[0009] S3: groundwater sampling analysis, divide the groundwater sample collection area into W equal size areas, each area is marked as U K , the center coordinates of the area are (x n , y n ) represent, divide the sample collection area into n collection areas, and divide it into n collection points, collect and analyze the samples;

[0010] Input the groundwater pollution concentration and information in multiple sample collection areas into the MapReduce model of step S2, compare with the information stored in step S2, quickly determine the detailed information of the groundwater pollution source, and at the same time, input the sample information collected in step S3 into the MapReduce model of step S2;

[0011] S4: secondary tracing, when the pollution groundwater information collected in step S3 cannot match the pollution information in step S2, the tracing fails, and stable isotope characteristic value, three-dimensional fluorescence water quality fingerprint and other tracing means are used to determine the groundwater pollution source, and the pollution source is determined as a new pollution source area M g , the pollution source information is input into step S2, and the groundwater pollution tracing is completed.

[0012] Specifically, in the determination process of the pollution source information in step S1, the wastewater and sewage components characteristics generated by the pollution source area are collected, the potential pollutants are identified, the pollution index P j elements are determined, and the water quality fingerprint of the wastewater and sewage and the isotope characteristic value of the potential pollutants are determined.

[0013] Specifically, in step S1, according to the hydrogeological conditions, groundwater flow field characteristics, and physical and chemical properties of the pollutants at the coordinate (x i , y i ) position, a two-dimensional convection-dispersion equation is used to describe the migration and diffusion process of the pollutants in the groundwater; the two-dimensional convection-dispersion equation is expressed as:

[0014]

[0015] Where C is the concentration of the pollutant, t is time, is the flow velocity of groundwater, D is the dispersion coefficient of the pollutant, and S is the source or sink term of the pollutant.

[0016] Specifically, D is a key parameter that determines the diffusion speed of the pollutant in the groundwater; the dispersion coefficient D can be obtained through laboratory measurement or field test, or estimated through an empirical formula; for some common pollutants, the following empirical formula is used to estimate the dispersion coefficient D:

[0017]

[0018] where T is the characteristic temperature of the pollutant.

[0019] Specifically, in step S3, the type of the pollutant and its pollution concentration are determined, and the groundwater pollution concentration is marked as W; the average value of the regional groundwater pollution concentration is established, and the expression is:

[0020]

[0021] In the formula, is the average value of the groundwater pollution concentration in the sample collection area, i is the ordering number of the sample collection area, i belongs to {1, 2, 3, …, n}, n is a positive integer, is the groundwater pollution concentration in the i-th sample collection area.

[0022] Specifically, the groundwater pollution source tracing in step S4 includes the following steps:

[0023] S41: sample collection, collecting water samples from the sample collection area to be measured;

[0024] S42: sample processing, pretreating the collected water samples by filtering to remove suspended solids;

[0025] S43: fluorescence spectrum measurement, using a three-dimensional fluorescence spectrometer to measure the pretreated water samples to obtain a three-dimensional fluorescence spectrum, the spectrum containing information of the excitation light wavelength and the emission light wavelength of the water sample to obtain the type and content information of the dissolved organic matter in the water sample;

[0026] S44: data analysis, determining the type and source of the dissolved organic matter in the water sample by analyzing the three-dimensional fluorescence spectrum, and evaluating the quality of the groundwater;

[0027] S45: groundwater pollution source tracing, determining the groundwater pollution source by matching the data obtained in step S44 with isotope data and pollutant concentration data.

[0028] The beneficial effects of the present application are:

[0029] (1) The groundwater pollution source tracing method of the present invention divides the groundwater area into M areas, with each potential pollution source that may cause pollution as an area, and each area is marked as M. g Determine the center coordinates (x, y) of the pollution source area. i y i ( ) Collect information on pollution sources in the area and match them with pollutants that pose a risk of water pollution, and determine the pollution index P. j By collecting parameters on pollutant migration and diffusion, samples can be focused on areas with high pollution risk for testing. Information on each pollution source can be obtained before groundwater pollution occurs. The system also describes the migration and diffusion process of pollutants in groundwater, registers each pollution source, and can develop groundwater pollution prevention plans based on the recorded data. Furthermore, it facilitates the rapid identification of pollution sources after groundwater pollution occurs, thus improving the efficiency of source tracing.

[0030] (2) The groundwater pollution source tracing method of the present invention inputs the groundwater pollution concentration and information in multiple sample collection areas into the MapReduce model of step S2. After comparing with the information stored in step S2, the detailed information of the groundwater pollution source is quickly determined. At the same time, the sample information collected in step S3 is entered into the MapReduce model of step S2, which facilitates the quick finding of the registered pollutant information, the corresponding pollution source, reduces the number of tests, improves the source tracing efficiency, and facilitates the quick finding of pollutants and timely treatment of pollution.

[0031] (3) In the groundwater pollution tracing method of the present invention, when the groundwater wastewater information collected in step S3 cannot match the pollution information in step S2 and the tracing fails, the groundwater pollution source is determined by using three-dimensional fluorescence water quality fingerprint data, isotope data and pollutant concentration data, and the pollution source is determined as a new pollution source area M. g The pollution source information is entered into step S2 to complete the source tracing of groundwater pollution, which facilitates the tracing of pollutants that are not registered. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 The present invention provides a flowchart of the steps of a groundwater pollution source tracing method. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] like Figure 1As shown, the groundwater pollution tracing method provided by the present application comprises the following steps:

[0036] S1: collecting pollution source information, dividing the groundwater area into M regions, taking each potential pollution source that can generate pollution as a region, and according to actual conditions, taking each enterprise in an industrial park as a region, taking each sewage treatment center in a residential area as a region, and taking each planting area in an agricultural region as a region, and marking each region as M g , determining the center coordinates (x i , y i ) of the pollution source region, collecting the pollution source information and the matched pollution substances that have water pollution risks of the region, determining the pollution index P j and the pollution substance migration and diffusion parameters, so as to focus on sample detection of the region with large pollution risks;

[0037] wherein x i is the horizontal coordinate of the region, y i is the vertical coordinate of the region, i is an integer greater than or equal to 1, j is an integer greater than or equal to 1, and g is an integer greater than or equal to 1;

[0038] In the determination process of the pollution source information in step S1, the wastewater and sewage component characteristics generated by the pollution source region in the pollution discharge link are collected, the potential pollutants are identified, the pollution index P j elements are determined, the water quality fingerprint of the wastewater and sewage of the region and the isotope characteristic value of the potential pollutants are determined; the information of each pollution source can be obtained before groundwater pollution occurs, each pollution source is recorded, a scheme for preventing groundwater pollution can be formulated according to the recorded data, and the pollution source can be quickly found after groundwater pollution occurs, so that the tracing efficiency is improved;

[0039] S2: analyzing and storing the pollution information; the region marking information M g , the coordinate (x i , y i ) information, the pollution index P j information and the pollution substance migration and diffusion information obtained in step S1 are stored through a MapReduce model; and various types of groundwater pollution remediation technology processes are stored;

[0040] S3: groundwater sampling and analysis, dividing the groundwater sample collection region into W regions of equal size, marking each region as U K , and the center coordinates of the region are (x n , y nThe process involves dividing the sample collection area into n equally spaced collection points, collecting and analyzing samples, and then rapidly correlating and comparing the data obtained from the water sample collection area with the information registered in step S1 at nearby locations to quickly determine the location M of the pollution source. g Pollutant element P j And pollutant migration and diffusion parameters to quickly pinpoint the pollution source;

[0041] S4: Secondary source tracing. When the groundwater information collected in step S3 cannot match the pollution information in step S2, and the source tracing fails, the groundwater pollution source is determined using three-dimensional fluorescence water quality fingerprint data, isotope data, and pollutant concentration data. This pollution source is then identified as a new pollution source area M. g The pollution source information is entered into step S2 to complete the tracing of groundwater pollution sources.

[0042] Specifically, in step S1, based on the coordinate (x i y i The hydrogeological conditions, groundwater flow field characteristics, and physicochemical properties of pollutants at the location were considered. A two-dimensional convection-dispersion equation was used to describe the migration and diffusion process of pollutants in groundwater. The two-dimensional convection-dispersion equation is expressed as follows:

[0043]

[0044] Where C is the concentration of the pollutant, and t is time. D is the groundwater flow velocity, S is the pollutant dispersion coefficient, and S is the pollutant source term or sink term.

[0045] D is a key parameter that determines the diffusion rate of pollutants in groundwater. The dispersion coefficient D can be obtained through laboratory measurements or field tests, or it can be estimated using empirical formulas. For some common pollutants, the following empirical formula is used to estimate the dispersion coefficient D:

[0046]

[0047] Here, T is the characteristic temperature of the pollutant; it facilitates a rapid understanding of the migration and diffusion process of pollutants in groundwater.

[0048] Specifically, in step S3, the type of pollutant and its concentration are determined, and the groundwater pollution concentration is marked as W;

[0049] The average concentration of groundwater pollution in the region is established using the following expression:

[0050]

[0051] In the formula, The average value of the groundwater pollution concentration in the sample collection area, i is the order number of the sample collection area, i belongs to {1, 2, 3, …, n}, n is a positive integer, The groundwater pollution concentration of the i-th sample collection area;

[0052] The groundwater pollution concentration and information in the plurality of sample collection areas are input into the MapReduce model of step S2, and the detailed information of the groundwater pollution source is quickly determined through comparison with the information stored in step S2, and the sample information collected in step S3 is input into the MapReduce model of step S2; the tracing efficiency and accuracy are improved.

[0053] Specifically, the groundwater pollution tracing in step S4 includes the following steps:

[0054] S41: sample collection, collecting water samples from the sample collection area to be measured;

[0055] S42: sample processing, pretreating the collected water samples by filtering to remove suspended solids;

[0056] S43: fluorescence spectrum measurement, using a three-dimensional fluorescence spectrometer to measure the pretreated water samples to obtain a three-dimensional fluorescence spectrum, the spectrum containing information of excitation light wavelength and emission light wavelength of the water sample to obtain the type and content information of the dissolved organic matter in the water sample;

[0057] S44: data analysis, determining the type and source of the dissolved organic matter in the water sample by analyzing the three-dimensional fluorescence spectrum, and evaluating the quality of the groundwater;

[0058] S45: groundwater pollution tracing, determining the groundwater pollution source by matching the data obtained in step S44 with isotope data and pollutant concentration data, so as to facilitate the tracing of unregistered pollutants.

[0059] In use, the groundwater area is divided into M regions, each potential pollution source that may cause pollution is taken as a region, each region is marked as M g , the center coordinates (x i , y i ) of the pollution source region are determined, the pollution source information of the collection region and the matched pollutant substances with water pollution risk are determined, and the pollution index P jAnd the pollution migration and diffusion parameters, so that the sample detection of the area with high pollution risk is focused, the information of each pollution source can be obtained before the groundwater pollution occurs, and the migration and diffusion simulation process of the pollutants in the groundwater is described, each pollution source is registered, and a scheme for preventing groundwater pollution can be formulated according to the recorded data, and the pollution source can be quickly found after the groundwater pollution occurs, the tracing efficiency is improved, the groundwater pollution concentration and information in the multiple sample collection areas are input into the MapReduce model of step S2, and the detailed information of the groundwater pollution source is quickly determined by comparison with the information stored in step S2, and the sample information collected in step S3 is input into the MapReduce model of step S2, so that the registered pollutant information can be quickly found, the corresponding pollution source can be found, the detection times are reduced, the tracing efficiency is improved, the pollutants can be quickly found, and the pollution can be timely treated, when the groundwater pollution information collected in step S3 cannot be matched with the pollution information in step S2, the tracing is invalid, the three-dimensional fluorescence water quality fingerprint data, the isotope data and the pollutant concentration data are used to determine the groundwater pollution source, and the pollution source is determined as a new pollution source area M g The pollution source information is input into step S2, and the groundwater pollution tracing is completed, so that the unregistered pollutants can be traced.

[0060] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be realized in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims to which they belong.

[0061] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A method of groundwater pollution source tracing, characterized by, The method comprises the following steps: S1: pollution source information collection, divide the groundwater area into M regions, take each potential pollution source that can produce pollution as a region, and mark each region as M g , determine the center coordinates (x i , y i ) of the pollution source region, collect the pollution source information of the region and the matched pollution substances that exist water pollution risks, determine the pollution index P j and the pollution substance migration and diffusion parameters, so as to focus on sample detection in the region with large pollution risk; where x i is the lateral coordinate of the region, y i is the longitudinal coordinate of the region, i is an integer greater than or equal to 1; j is an integer greater than or equal to 1; g is an integer greater than or equal to 1; S2: analyze and store the pollution information; store the regional marking information M g , coordinate (x i , y i ) information, pollution index P j information and pollution migration and diffusion information through the MapReduce model; at the same time, store various types of groundwater pollution remediation technology processes; S3: groundwater sampling analysis, dividing the groundwater sample collection area into W equal size regions, each region marked as U K , the center coordinates of the region are (x n , y n ) represent, equally divide the sample collection area into n collection points, collect and analyze the sample; The groundwater pollution concentration and information in the plurality of sample collection areas are input into the MapReduce model of step S2, and the detailed information of the groundwater pollution source is quickly determined through comparison with the information stored in step S2, and the sample information collected in step S3 is input into the MapReduce model of step S2; S4: secondary tracing, when the underground sewage information collected in step S3 and the pollution information in step S2 cannot be matched, the tracing fails, and the three-dimensional fluorescence water quality fingerprint data, isotope data and pollutant concentration data are used to determine the underground water pollution source, and the pollution source is determined as a new pollution source area M g The pollution source information is input into step S2, and the underground water pollution tracing is completed.

2. The method of claim 1, wherein: In the determination process of the pollution source information in step S1, the component characteristics of the wastewater and sewage generated in the production and pollution discharge link of the pollution source area are collected, the potential pollutants are identified, and the pollution index P is determined j elements, and the water quality fingerprint and the isotope characteristic value of the potential pollutants of the wastewater and sewage in the area are determined.

3. The method of claim 2, wherein: In step S1, the hydrogeological conditions, groundwater flow field characteristics, and physical and chemical properties of the pollutants at the coordinate (x i , y i ) position are used to describe the migration and diffusion process of the pollutants in the groundwater by using a two-dimensional convection-dispersion equation, which is expressed as: where C is the concentration of the contaminant, t is time, is the flow velocity of the groundwater, D is the dispersion coefficient of the contaminant, and S is the source or sink term of the contaminant.

4. The method of claim 3, wherein: D is a key parameter, which determines the diffusion speed of the pollutant in the groundwater; the dispersion coefficient D can be obtained through laboratory measurement or field test, or can be estimated through an empirical formula; for some common pollutants, the dispersion coefficient D is estimated using the following empirical formula: where T is the characteristic temperature of the pollutant.

5. The method of claim 1, wherein: In step S3, the type and pollution concentration of the pollutant are determined, and the groundwater pollution concentration is marked as W; the average value of the regional groundwater pollution concentration is established, and the expression is: wherein, is the average concentration of groundwater pollution in the sample collection area, i is the order number of the sample collection area, i belongs to {1, 2, 3, …, n}, n is a positive integer, is the concentration of groundwater pollution in the i-th sample collection area.

6. The method of claim 1, wherein: The groundwater pollution source tracing in step S4 comprises the following steps: S41: sample collection, collecting water samples from the sample collection area to be measured; S42: sample treatment, pretreating the collected water samples by removing suspended solids through filtration; S43: fluorescence spectrum measurement, measuring the pretreated water samples using a three-dimensional fluorescence spectrometer to obtain a three-dimensional fluorescence spectrum, and the spectrum contains information of the excitation light wavelength and the emission light wavelength of the water sample to obtain the type and content information of the dissolved organic matter in the water sample; S44: data analysis, determining the type and source of the dissolved organic matter in the water sample by analyzing the three-dimensional fluorescence spectrum, and evaluating the quality of the groundwater; S45: groundwater pollution source tracing, determining the groundwater pollution source by matching the data obtained in step S44 with the isotope data and the pollutant concentration data.

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