Ecological environment damage and recovery evaluation method for polluted site

Abstract

The invention relates to a polluted site ecological environment damage and recovery evaluation method. The method comprises the following steps: S1, constructing a multi-dimensional underground water ecological environment recovery capability indication index system coupling hydrogeology, pollution degree and recovery technical elements; s2, carrying out quantitative evaluation on a space tracing-source analysis-migration-degradation process of underground water pollution; s3, establishing an underground water ecological environment natural recovery capability evaluation and visualization platform based on multiple factors, multiple dimensions and multiple targets; and S4, constructing a site-region groundwater ecological environment damage quantitative model. According to the method, the groundwater damage evaluation efficiency is improved, the accuracy of the evaluation result is guaranteed, and support can be provided for the ecological environment and judicial departments to carry out groundwater damage compensation and litigation.

Description

Technical Field

[0001] The present invention relates to the technical field of soil and groundwater restoration, and in particular to a method for assessing ecological environment damage and restoration at a polluted site. Background Art

[0002] The research on key technologies for ecological environmental damage assessment and restoration in my country started late, but has developed rapidly in recent years. With the support of the Environmental Planning Institute of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment has successively issued eight ministerial technical documents, including "Recommended Methods for Calculating the Amount of Environmental Pollution Damage (Version I)" and "Recommended Methods for Environmental Damage Identification and Assessment (Version II)", as well as six national standards, including "General Principles and Key Links of the Technical Guidelines for Ecological Environmental Damage Identification and Assessment Part 1: General Principles" and "Environmental Elements of the Technical Guidelines for Ecological Environmental Damage Identification and Assessment Part 1: Soil and Groundwater", and initially established a technical method and standard system for ecological environmental damage identification and assessment covering all environmental elements. However, the existing quantitative methods for soil and groundwater ecological environmental damage in sites still cannot meet the needs of rapid and accurate assessment. It is urgent to improve the relevant method system and use model-based assessment to improve assessment efficiency and standardization.

[0003] 1. Polluted sites - regional ecological environment restoration capacity and assessment technology Resilience is the ability of natural systems to purify themselves. Domestic research on resilience mainly focuses on ecosystems and disaster systems. In recent years, some domestic researchers have evaluated the restoration of regional ecological damage in petrochemical contaminated sites based on natural attenuation, focusing mainly on the quantitative monitoring and migration and transformation laws of organic pollutants in groundwater. Through mass flux calculation, indoor simulation experiments, multiphase flow dynamics models and other research methods, the natural attenuation rate constants are calculated to evaluate the level of resilience of contaminated sites. Liu Xiaoli et al. established a variable coefficient kinetic model for the migration of organic pollutants in groundwater through research. Xue Qiang et al. studied the migration of petroleum pollutants in groundwater and established a multiphase flow dynamics model for the migration of organic pollutants. Li Yang et al. used a combination of field sample collection, indoor analysis, water quality evaluation and model simulation to study the characteristics of petroleum pollution and the natural attenuation process in shallow groundwater of contaminated sites, established a groundwater migration and transformation model for petroleum pollutants, and predicted the natural attenuation restoration effect. Wang Bing et al. conducted an indoor simulation experiment of natural attenuation and studied the natural attenuation mechanism of diesel in different aeration zone media. Jia Hui and others conducted a natural attenuation test of petroleum pollutants and evaluated the natural attenuation capacity and environmental quality of soil pollutants. Jiang Lingzhi and others used the mass flux method to evaluate the contribution of adsorption and microbial degradation in the natural attenuation process of BTEX and ethanol. Zhang Cuiyun and others studied the effect and effectiveness of natural attenuation of pollutants in the soil aeration zone and groundwater in the southern sewage irrigation area of ​​Shijiazhuang City. In general, current research focuses on the analysis of the mechanism of the attenuation process of site pollutants. The site soil and groundwater have complex ecological and environmental effects, and their recovery capacity is affected by multiple factors such as ecosystems, hydrogeology, degree of pollution, and environmental restoration technology. At the same time, the recovery process includes multiple dimensions such as pollutant space-recovery time. The current groundwater ecological and environmental recovery capacity indicator system is still imperfect, and its natural recovery capacity assessment method is still not sound.

[0004] 2. Research on quantitative model of ecological damage of polluted sites and regional groundwater my country has not yet developed a quantitative model for groundwater environmental damage, and has only accumulated some experience in characterizing the spatial scope of pollution and making restoration decisions. my country started late in research on the ecological environmental damage of polluted sites and regions, and has not yet developed a widely applicable quantitative model for the ecological environmental damage of polluted sites and regions. However, there has been some research on common technical methods such as numerical simulation of groundwater flow, geographic spatial difference, and decision-making on the restoration of polluted sites.

[0005] The uncertainty of groundwater pollution range characterization is affected by many factors such as interpolation method, number of points and nature of pollutant migration and transformation. In terms of three-dimensional space interpolation, three-dimensional space interpolation methods such as Kriging method, nearest neighbor interpolation method and inverse distance weight method have been widely used in the quantitative study of groundwater damage range and degree. However, due to the lack of consideration of the migration and transformation of pollutants with groundwater, the damage range obtained by interpolation has great uncertainty. In the study of pollutant migration simulation, although the simulation can accurately describe the situation and range of pollutant migration with groundwater, it requires a large number of hydrogeological parameters, the modeling process is complicated, and the setting of hydrogeological parameters and model boundaries will also bring great uncertainty to the simulation. Zhang Zhiming et al. found that in the definition of groundwater pollution range, the uncertainty of groundwater numerical simulation model parameters will affect the simulation results, resulting in uncertainty in the results; Wu Jichun et al. found that the deviation of groundwater model boundary conditions is also an important factor leading to uncertainty in simulation results. How to combine the advantages of solute transport simulation with three-dimensional space interpolation to improve the accuracy of pollution range characterization is a difficult problem to reduce the uncertainty of damage quantification.

[0006] The research on site remediation decision-making methods and models is relatively mature, but the research on decision-making models that comprehensively consider basic restoration and compensatory restoration in damage assessment has not been carried out in depth. In the field of decision-making on the target of contaminated site remediation, Gu Qingbao et al. combined the experience of decades of Super Fund in 2008 and put forward countermeasures and suggestions for the classification and screening of remediation technologies; Luo Chengzhong et al. proposed the basic route for the screening of POPs contaminated site remediation technologies in my country; Feng Mao et al. conducted research on multi-objective decision-making of petroleum contaminated groundwater remediation system based on different decision-making methods; Tao Huan et al. calculated the weights of remediation technology evaluation indicators by analytic hierarchy process, and applied the two models of approximation to ideal solution and gray comprehensive evaluation to the screening of soil remediation technology for a certain organic contaminated site, and the ranking results were consistent. At present, site remediation decision-making methods and models are mostly based on factors such as cost and remediation efficiency to make decisions and sort. The remediation decision in damage assessment should not only consider the basic remediation cost, but also the length of remediation time directly determines the period loss, compensatory remediation scale and cost. Therefore, the decision-making process of groundwater damage remediation is more complicated, and the correlation between basic remediation and compensatory remediation time, cost and other factors should be coordinated. Summary of the invention

[0007] The purpose of the present invention is to provide a method for assessing ecological environment damage and restoration of polluted sites, thereby improving the efficiency of groundwater damage assessment and ensuring the accuracy of assessment results.

[0008] The technical solution of the present invention: A method for assessing ecological environment damage and restoration of a polluted site comprises the following steps: S1. Construct a multi-dimensional groundwater ecological environment restoration capacity indicator system that couples hydrogeology, pollution level, and restoration technology elements; S2. Conduct quantitative assessment of the spatial tracing-source apportionment-migration-degradation process of groundwater pollution; S3. Establish a platform for assessing and visualizing the natural recovery capacity of groundwater ecological environment; S4. Construct a quantitative model for site-region groundwater ecological environmental damage.

[0009] Preferably, S1 is based on the principles of the whole life cycle process, science and operability, and the combination of qualitative and quantitative indicators. Through on-site investigation and reference to domestic and foreign research, relevant indicators are screened out, and indicators are established through theoretical analysis and expert consultation methods.

[0010] Preferably, in S2, the spatial tracing of groundwater pollution is quantified based on high-precision thin film interface detection and magnetic resonance spectroscopy methods, the process of pollution source analysis-migration-degradation is quantified based on monomer stable isotopes and geochemical indicator analysis methods; and the effect of monitoring natural attenuation recovery technology is quantified based on mass flux and microbiological methods.

[0011] Preferably, S3 targets multiple factors such as pollution degree and restoration technology in the assessment of the natural restoration capacity of the ecological environment, takes material flow and value flow as the context, uses the hierarchical analysis method to weight the evaluation indicators, selects fuzzy comprehensive evaluation and / or Monte-Carlo method to establish a restoration capacity assessment method, and uses WebGL spatial rendering technology to realize assessment visualization.

[0012] Preferably, S4 includes the following steps: constructing and coupling the model using C# language programming, so that the model database module has matching and screening functions, the investigation and quantification module has GIS editing functions, and the repair decision module has repair plan ranking functions and repair cost calculation functions.

[0013] Preferably, the restoration decision module described in S4 uses the analytic hierarchy process (AHP) subjective and objective weighting method to establish a hierarchical model, construct a judgment matrix, and use fuzzy theory and expectation operators to determine the ownership and degree of membership of each factor at each level, and determine the weights of factors related to restoration technology performance, environmental impact, economic benefits, regional coordination and restoration decision-making.

[0014] Preferably, the ranking of remediation plans in the remediation decision module in S4 is mainly carried out by studying and comparing commonly used groundwater remediation decision models at home and abroad, selecting 2-3 multi-attribute decision-making methods to embed in the model, comparing the ranking of remediation plans of different decision-making methods, verifying the rationality of the remediation plan, and selecting a remediation plan that meets the actual situation, is accurate and reasonable, and meets the requirements of relevant stakeholders.

[0015] Beneficial effects of the present invention: Based on a comprehensive summary of damage assessment research and practical experience at home and abroad, the present invention utilizes the intrinsic relationship between databases, damage recovery plan formulation, damage quantification and other links, and proposes to develop damage assessment links such as investigation and quantification, recovery capacity assessment, repair decision-making and damage cost estimation as a whole through the construction of mathematical models and basic databases, thus ensuring the integrity and systematicness of damage assessment, and is innovative in its thinking.

[0016] The present invention improves the efficiency of groundwater damage assessment, ensures the accuracy of assessment results, and can also provide support for ecological environment and judicial departments to carry out groundwater damage compensation and litigation.

[0017] (1) In terms of the indicator system, the goal is to meet the technical needs of ecological environmental damage identification and assessment. By coupling multiple factors such as ecosystems, hydrogeology, organic pollution levels, and ecological environmental restoration technologies, the indicator system for groundwater ecological environmental restoration capacity is established based on the principles of covering the entire life cycle, scientificity and operability, combining qualitative and quantitative indicators, and continuous improvement. The indicator selection and optimization methods such as theoretical analysis, expert consultation, principal component analysis, and independence analysis are used to ensure that the indicator system is fully representative.

[0018] (2) In terms of evaluation methods, we will carry out a detailed characterization of multi-component and multi-phase states of groundwater pollution based on the spatial dimension of the site-region, the dynamic and static dimensions of the source-migration-degradation of pollutants, and the temporal dimension of recovery capacity; based on multiple factors such as ecosystem, hydrogeology, degree of organic pollution, and recovery technology; based on multiple processes such as coupling groundwater pollution spatial tracing-quantification of pollution migration process-quantification of pollution natural attenuation-ecosystem service function evaluation, and establish a multi-dimensional numerical model method for site water-containing medium heterogeneity and pollution distribution. Based on the material flow (pollutant removal, etc.) and value flow (cost-effectiveness, ecological function, recovery time), we will use the hierarchical analysis method to weight and quantify different evaluation indicators, and select fuzzy comprehensive evaluation neural network, Monte-Carlo and other multi-index comprehensive evaluation methods to establish an ecological environment natural recovery capacity evaluation method.

[0019] (3) In terms of model construction, the entire damage assessment process, including basic database, groundwater investigation and quantification, recovery capacity assessment, groundwater remediation decision-making, and remediation cost estimation, is innovatively embedded in the model, focusing on solving bottleneck problems such as the accuracy of physical quantification of porous aquifer damage in typical petrochemical sites, the scientific nature of remediation decisions, and the rationality of cost estimates, to ensure the efficiency and standardization of the damage assessment process and the accuracy and credibility of the damage assessment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the technical roadmap of the present invention. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, the present invention relates to the following two aspects: 1. Site pollution-regional ecological environment restoration assessment technology (1) Constructing a multi-dimensional indicator system for groundwater ecological environment restoration capacity that couples hydrogeology, pollution level, and restoration technology elements In order to meet the technical needs for identification and assessment of ecological and environmental damage in contaminated sites, this paper aims to evaluate the complex ecological and environmental effects of soil and groundwater on the sites, comprehensively consider factors such as complex ecosystems, hydrogeology, degree of pollution, and environmental restoration technology, and take restoration of the site-regional ecological functions as the goal. It evaluates the attenuation processes such as chemical (chemical transformation), biodegradation (reducing the mobility and bioaccessibility of pollutants), and physical degradation (physical isolation and diffusion), and constructs an indicator for the groundwater ecological and environmental recovery capacity.

[0022] Based on the principles of the entire life cycle process, science and operability, and the combination of qualitative and quantitative indicators, through on-site investigations and drawing on domestic and foreign research, relevant indicators are screened out, and the indicators are established through theoretical analysis and expert consultation methods.

[0023] (2) Assessment method of natural recovery capacity of groundwater ecological environment The pollution degradation process is quantified by using methods such as pollutant mass calculation, geochemical indicator analysis, and isotope analysis. New methods such as high-precision thin film interface detection Geoprobe-MIP and magnetic resonance spectroscopy MRS-TEM are applied to carry out a detailed characterization of the multi-component and multi-phase states of groundwater pollution, and to establish a multidimensional numerical model of the site's water-containing medium heterogeneity and pollution distribution data.

[0024] In view of the multiple factors in the assessment of the natural recovery capacity of the ecological environment, with material flow (pollutant removal, etc.) and value flow (cost-effectiveness, ecological function, recovery time) as the context, the hierarchical analysis method is used to assign weights to different evaluation indicators, and fuzzy comprehensive evaluation, neural network, Monte-Carlo and other multi-indicator comprehensive evaluation methods are selected to study and establish a method for assessing the natural recovery capacity of the groundwater ecological environment.

[0025] Specific steps include conducting a quantitative assessment of the spatial tracing-source analysis-migration-degradation process of groundwater pollution; quantifying the spatial tracing of groundwater pollution based on high-precision thin film interface detection and magnetic resonance spectroscopy methods, and quantifying the source analysis-migration-degradation process based on monomer stable isotopes and geochemical indicator analysis methods; and quantifying the effect of monitoring natural attenuation recovery technology based on mass flux and microbiological methods.

[0026] Establish a groundwater ecological environment natural recovery capacity assessment and visualization platform based on multiple factors, multiple dimensions and multiple objectives; focus on the pollution degree and restoration technology in the natural recovery capacity assessment of the ecological environment, use material flow and value flow as the context, use the hierarchical analysis method to weight the evaluation indicators, select fuzzy comprehensive evaluation and / or Monte-Carlo method to establish a recovery capacity assessment method, and use WebGL spatial rendering technology to realize assessment visualization.

[0027] Constructing a site-region groundwater ecological environment damage quantification model integrating physical quantification, restoration decision-making and value quantification (1) Establishing a basic database for groundwater damage assessment at petrochemical sites Investigate groundwater environmental damage cases, typical pollutants, typical hydrogeological conditions, and remediation technologies applicable to groundwater pollution in petrochemical sites in Hebei Province, study the correlation between characteristic pollutants, hydrogeological parameters, remediation technologies and remediation costs, and use C# programming to build a basic database for groundwater damage assessment in petrochemical sites in Hebei Province; based on the survey data, construct screening matrices such as pollutants-applicable remediation technologies, typical hydrogeological conditions-applicable remediation technologies, damage cases-common remediation technologies, and preliminarily screen remediation technologies applicable to specific sites.

[0028] (2) Research on optimization of spatial interpolation method for groundwater damage Study the migration patterns of typical pollutants in petrochemical sites in groundwater, optimize methods and parameters such as survey site layout and spatial interpolation, study the accuracy of damage survey results under different site layout schemes and different quantification methods, explore dynamic adjustment methods for survey points, and capture pollution in a refined manner to reduce the deviation between damage quantification results and actual results; based on the migration and transformation patterns of pollutants in groundwater, combine the advantages of solute transport simulation with three-dimensional spatial interpolation to improve the accuracy of pollution range characterization and reduce the uncertainty of damage quantification.

[0029] (3) Research on key indicators and methods for decision-making on groundwater remediation solutions for typical petrochemical sites A comprehensive analysis of the performance, environmental impact, economic benefits and other indicators of different groundwater remediation technologies is conducted, and the impact of the recovery capacity of characteristic pollutants in petrochemical sites, the recovery period and losses during the recovery period, and the quantification of damage value are comprehensively considered. Expert scoring, grey correlation analysis and other methods are used to assign weights to subjective and objective factors, and a key indicator system for screening groundwater remediation technologies in petrochemical sites is studied and constructed. The characteristics of various existing decision-making methods are summarized, and different evaluation methods are compared and verified for different pollution scenarios and remediation needs to identify the optimal comprehensive decision-making method for basic and compensatory restoration plans for environmental damage.

[0030] (4) Research on the quantification method of groundwater damage value Conduct theoretical research on the value of groundwater environmental resources. On the basis of domestic and foreign literature research and case practice, establish a system of quantitative indicators and evaluation methods for groundwater resource value, and construct economic value evaluation methods for used and unused groundwater resources. For the commonly used groundwater remediation technologies in petrochemical sites, study the elements and unit prices of remediation projects, and establish a groundwater damage value evaluation method based on restoration. Study the applicable situations of different quantification methods, and form a comprehensive resource value evaluation and a damage quantification and period loss quantification method based on restoration cost accounting.

[0031] Specific methods: The model is constructed and coupled using C# programming language, so that the model database module has matching and screening functions, the investigation and quantification module has GIS editing function, and the restoration decision module has the function of ranking the restoration plans and calculating the restoration costs.

[0032] The restoration decision module uses the AHP subjective and objective weighting method to establish a hierarchical model, construct a judgment matrix, and use fuzzy theory and expectation operators to determine the ownership and degree of membership of each factor at each level, and determine the weights of restoration technology performance, environmental impact, economic benefits, regional coordination and restoration decision-related factors.

[0033] The ranking of remediation plans in the remediation decision-making module is mainly achieved by studying and comparing commonly used groundwater remediation decision-making models at home and abroad, selecting 2-3 multi-attribute decision-making methods to embed in the model, comparing the ranking of remediation plans of different decision-making methods, verifying the rationality of the remediation plans, and selecting remediation plans that meet the actual situation, are accurate and reasonable, and meet the requirements of relevant stakeholders.

[0034] The above description is only used to introduce the specific implementation methods of the present invention in detail, but the technical solution proposed by the present invention is not limited to the above method. Without departing from the basic principles of the present technology, equivalent modifications and changes made by those skilled in the art to the technology proposed by the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for assessing ecological environment damage and restoration of polluted sites, characterized in that: The following steps are involved: S1. Construct an indicator system for groundwater ecological environment restoration capacity that couples hydrogeology, pollution level, and restoration technology elements; S2. Conduct quantitative assessment of the spatial tracing-source apportionment-migration-degradation process of groundwater pollution; S3. Establish a platform for assessing and visualizing the natural recovery capacity of groundwater ecological environment; S4. Construct a quantitative model for site-region groundwater ecological environmental damage.

2. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 1 is characterized in that: S1 is based on the principles of the whole life cycle process, science and operability, and the combination of qualitative and quantitative indicators. Through on-site investigations and reference to domestic and foreign research, relevant indicators are screened out, and the indicator system is established through theoretical analysis and expert consultation methods.

3. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 1 is characterized in that: In S2, high-precision thin film interface detection and magnetic resonance spectroscopy methods are used to quantify the spatial tracing of groundwater pollution. The process of pollution source analysis-migration-degradation is quantified based on monomer stable isotopes and geochemical indicator analysis methods. The effect of monitoring natural attenuation recovery technology is quantified based on mass flux and microbiological methods.

4. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 1 is characterized in that: In S3, the degree of pollution and restoration technology are multiple factors in the assessment of the natural restoration capacity of the ecological environment. With material flow and value flow as the context, the hierarchical analysis method is used to weight the evaluation indicators, and the fuzzy comprehensive evaluation and / or Monte-Carlo method are selected to establish a restoration capacity assessment method. The WebGL spatial rendering technology is used to realize the assessment visualization.

5. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 1 is characterized in that: S4 includes the following steps: using C# language programming to construct and couple the model, so that the model database module has matching and screening functions, the investigation and quantification module has GIS editing functions, and the repair decision module has repair plan ranking functions and repair cost calculation functions.

6. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 5 is characterized in that: The restoration decision module described in S4 uses the analytic hierarchy process (AHP) subjective and objective weighting method to establish a hierarchical model and construct a judgment matrix. Fuzzy theory and expectation operators are used to determine the ownership and degree of membership of each factor at each level, and to determine the weights of factors related to restoration technology performance, environmental impact, economic benefits, regional coordination and restoration decision-making.

7. The method for assessing ecological environment damage and restoration of contaminated sites according to claim 5 is characterized in that: The ranking of remediation plans in the remediation decision-making module in S4 is carried out by studying and comparing the commonly used groundwater remediation decision-making models at home and abroad, selecting the decision method to embed into the model, comparing the ranking of remediation plans of different decision methods, verifying the rationality of the remediation plan, and selecting the remediation plan that meets the actual situation, is accurate and reasonable, and meets the requirements of relevant stakeholders.

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