Construction land polluted soil remediation effect comprehensive evaluation and grading method
By constructing a set of evaluation indicators for the remediation of contaminated soil and a fuzzy comprehensive evaluation method, the problem of existing technologies failing to fully consider the reuse purposes of soil and public recognition has been solved, and a scientific and comprehensive evaluation of the remediation effect of contaminated soil has been achieved.
Patent Information
- Application Number
- CN202510659076.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2025-10-17
AI Technical Summary
When evaluating the effectiveness of contaminated soil remediation, existing technologies fail to fully consider the soil's reuse purposes, changes in the soil's physical and chemical properties after remediation, and public acceptance, resulting in an evaluation that is not scientific and comprehensive enough.
The expert consultation method and hierarchical analysis method were used to construct a set of evaluation indicators for the remediation effect of contaminated soil. Combined with the fuzzy evaluation method, the treatment effect, soil physical and chemical properties, environmental impact and public recognition were comprehensively considered, and the remediation effect level was determined through fuzzy comprehensive evaluation.
It has achieved an accurate and comprehensive assessment of the remediation effect of contaminated soil, taking into account the target pollutant residues, environmental impacts and public recognition in the remediated soil, and improving the scientific nature and applicability of the assessment.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of soil remediation, and particularly relates to a construction land contaminated soil remediation effect comprehensive evaluation grading method, which can realize accurate, comprehensive and scientific evaluation of the construction land soil remediation effect. BACKGROUND
[0002] Contaminated soil remediation effect evaluation is an important part of soil remediation engineering and a key link of China's contaminated site environmental management. At present, there are many application technologies for soil remediation engineering in China, such as chemical oxidation technology, thermal desorption technology, normal temperature resolution technology and gas phase extraction technology. Scientific and reasonable evaluation of the influence of remediation engineering on the quality of contaminated soil is not only related to the reuse of soil after remediation, but also has important guiding significance for the development of remediation scheme.
[0003] At present, the soil remediation effect evaluation guide specification in China is the Technical Guidelines for Risk Management and Soil Remediation Effect Evaluation of Contaminated Land (25.5-2019), and the guide specification uses the comparison between the total amount of residual pollution in soil after remediation and the target value of remediation to evaluate the remediation effect. The residual pollution analysis method is the most intuitive method for evaluating the remediation effect of contaminated soil, which is simple and easy to operate. However, this method does not consider the reuse purpose of soil, ignores the influence of remediation engineering on the physical and chemical properties of soil, lacks the evaluation of the acceptance of remediation engineering by surrounding residents, and does not consider the residual pollution content in soil after remediation, which is not conducive to the comprehensive evaluation of the remediation effect of soil.
[0004] At present, the state vigorously guides the research and development of green and low-carbon remediation technology, and therefore, it is urgent to establish a set of comprehensive soil remediation effect evaluation method suitable for green and low-carbon remediation technology, so as to ensure that the remediation technology is scientifically and effectively applied to contaminated sites and improve the level of soil pollution prevention and control in China. SUMMARY
[0005] The purpose of the present application is to provide a construction land contaminated soil remediation effect comprehensive evaluation grading method, which comprehensively considers the factors such as remediation effect, soil physical and chemical properties, environmental impact and public acceptance, and establishes a set of accurate, scientific, comprehensive and user-friendly contaminated soil remediation effect comprehensive evaluation grading method.
[0006] To achieve the above purpose, the construction land contaminated soil remediation effect comprehensive evaluation grading method provided by the present application comprises the following steps:
[0007] 1) The expert consultation method and the theoretical analysis method are used to screen the key technical parameters that can represent the soil remediation effect, and an evaluation index set U of the contaminated soil remediation effect is constructed;
[0008] 2) A fuzzy evaluation comment set V is constructed;
[0009] 3) Obtain the results of each evaluation index in the soil before and after repair;
[0010] 4) According to the membership principle, determine the membership of each evaluation index, and obtain the fuzzy evaluation matrix R;
[0011] 5) The relative importance of each evaluation index is determined by using the analytic hierarchy process, and the weight of each index is calculated to obtain the weight matrix W;
[0012] 6) The weighted average operator is used to calculate the fuzzy comprehensive evaluation result matrix H;
[0013] 7) According to the maximum membership principle, the comprehensive evaluation grade of soil remediation effect is determined by the matrix H.
[0014] The construction land contaminated soil remediation effect comprehensive evaluation grading method, the evaluation index set U in step 1) is divided into three layers: target layer, criterion layer and index layer.
[0015] The target layer A includes the treatment effect index B1, the physicochemical property index B2, the environmental impact index B3 and the public recognition index B4.
[0016] The treatment effect index B1 includes the target pollutant reduction rate U1, the residual pollution index U2 and the remediation effect stability coefficient U3.
[0017] The physicochemical property index B2 includes soil pH U4, soil texture U5 and soil organic matter U6.
[0018] The environmental impact index B3 includes the generation of toxic and harmful substances U7, the discharge of pollutants U8, the occurrence of pollution accidents U9 and the increase of reagents U10.
[0019] The public recognition index B4 includes the public satisfaction with the environment U11 and the economy U12 brought by the remediation project.
[0020] U={U1,U2,U3...U11,U12}
[0021] The construction land contaminated soil remediation effect comprehensive evaluation grading method, step 2) fuzzy evaluation comment set V={v1,v2,…,v m}, the evaluation index is divided into excellent, good, medium and qualified four grades, which form the comment set V={excellent, good, medium, qualified}(m=4), see Table 1.
[0022] The construction land contaminated soil remediation effect comprehensive evaluation grading method, in step 3), the results of each evaluation index in the soil before and after remediation can be obtained from the plot soil pollution status investigation report, the risk assessment report, the results of each evaluation index after remediation can be obtained from the environmental supervision report, the remediation effect evaluation report or by laboratory analysis and testing, and the public recognition index can be obtained by personnel interview.
[0023] In the construction land contaminated soil remediation effect comprehensive evaluation grading method, the fuzzy evaluation matrix R is calculated by the membership function, and each row in R reflects the membership of the index value in the four evaluation intervals. For qualitative evaluation and quantitative evaluation indexes, different membership functions are established.
[0024]
[0025] The qualitative evaluation indexes include soil texture U5, toxic and harmful substance generation U7, pollutant discharge compliance U8, and pollution accident U9.
[0026] The quantitative evaluation indexes include target pollutant reduction rate U1, residual pollution index U2, remediation effect stability coefficient U3, soil pH U4, organic matter U6, reagent increase U10, environmental satisfaction U11, and economic satisfaction U12.
[0027] The degree v to which a certain qualitative evaluation index belongs to the mth evaluation level (m = excellent, good, medium, and qualified) m is:
[0028]
[0029] A certain quantitative evaluation index adopts a semi-trapezoidal membership function, as shown in Table 2.
[0030] In the construction land contaminated soil remediation effect comprehensive evaluation grading method, the weight calculation method of each evaluation index in step 5) is the analytic hierarchy process. Its characteristics are that nine scale method is used to establish five matrices, A = {B1, B2, B3, B4} (matrix 1-1), B1 = (U1, U2, U3) (matrix 2-1), B2 = (U4, U5, U6) (matrix 3-1), B3 = (U7, U8, U9, U10) (matrix 4-1), and B5 = (U11, U12) (matrix 5-1). According to the expert group scoring method, the corresponding values in each judgment matrix are obtained. After normalization operation and consistency test, the weights corresponding to the criterion layer and the index layer are obtained, and the weight matrix W corresponding to the index layer to the target layer is obtained by multiplication.
[0031] W = (w1, w2, … w 11 , w12 )
[0032] The expert group consists of 4 people from the environmental management department, 8 industry experts, 6 people from restoration companies, and 4 people from the owner units, and the scoring weights are 0.3, 03, 0.2, and 0.2 respectively.
[0033] In the comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land, the fuzzy comprehensive evaluation result matrix in step 6) is is the weighted average operator.
[0034]
[0035] In the method for comprehensive evaluation and grading of the remediation effect of contaminated soil on construction land, the comprehensive evaluation grade of the soil remediation effect described in step 7) is determined by the maximum membership principle of H, and the evaluation grade corresponding to the maximum value in the matrix is selected as the evaluation result.
[0036] The present invention can accurately, comprehensively and scientifically evaluate the remediation effect of contaminated soil. It not only takes into account the residual content of target pollutants in the soil after remediation, but also designs environmental impact indicators and public recognition indicators for the remediation process, and takes into account soil health and reuse-related standards. It is suitable for comprehensive evaluation of the remediation effect of soil for construction land, and is more applicable and scientific than the existing single comparison method.
[0037] Table 1 Fuzzy evaluation comment set V for soil remediation effect
[0038]
[0039] Table 2-1 Evaluation index membership function
[0040]
[0041] Table 2-2 Evaluation index membership function
[0042] BRIEF DESCRIPTION OF THE DRAWINGS
[0043] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0044] Figure 1 Schematic diagram of the system flow in this application.
[0045] Figure 2 Schematic diagram of the process used to evaluate the grading approach for this application. DETAILED DESCRIPTION
[0046] The application discloses a method for comprehensively evaluating and grading a remediation effect of contaminated soil of construction land.
[0047] 1) Key technical parameters capable of representing the soil remediation effect are screened by adopting an expert consultation method and a theoretical analysis method, and an evaluation index set U of the contaminated soil remediation effect is constructed;
[0048] 2) A fuzzy evaluation comment set V is constructed;
[0049] 3) Results of each evaluation index in the soil before and after remediation are obtained;
[0050] 4) According to a membership degree principle, the membership degrees of the evaluation indexes are determined, and a fuzzy evaluation matrix R is obtained;
[0051] 5) The relative keyness of each evaluation index is determined by adopting an analytic hierarchy process, the weight of each index is calculated, and a weight matrix W is obtained;
[0052] 6) A weighted average type operator is adopted to calculate a fuzzy comprehensive evaluation result matrix H;
[0053] 7) According to a maximum membership degree principle, the soil remediation effect comprehensive evaluation grade is determined from the matrix H.
[0054] In the step 1), the evaluation index set U is divided into three layers: a target layer, a criterion layer and an index layer.
[0055] The criterion layer includes a treatment effect index, a physicochemical property index, an environmental influence index and a public recognition index; the treatment effect index reflects changes of pollutants before and after remediation and remediation effect stability, and includes a target pollutant reduction rate, a residual pollution index and a remediation effect stability coefficient; the physicochemical property index reflects changes of soil fertility and health quality before and after remediation, and includes soil pH, soil texture and soil organic matter; the environmental influence index reflects environmental influence conditions of the remediation process, and includes generation conditions of toxic and harmful substances, pollutant discharge conditions, pollution accident occurrence conditions and reagent adding conditions; and the public recognition index reflects satisfaction conditions of the public to environmental and economic promotion of the remediation process.
[0056] In the step 2), the fuzzy evaluation comment set V = {v1, v2,..., v m}, the evaluation indexes are divided into four grades of excellent, good, medium and qualified, the comment set V = {excellent, good, medium, qualified} (m = 4) is formed, and Table 1 is specifically shown.
[0057] Wherein the results of each evaluation index in soil before and after repair in step 3) are obtained from the soil pollution status investigation report, the risk assessment report, the repair effect evaluation report or laboratory analysis test, and the public recognition index is obtained from personnel interview.
[0058] Wherein the fuzzy evaluation matrix R in step 4) is calculated by the membership function, and each row in R reflects the membership of the index value in the four evaluation intervals. For qualitative and quantitative evaluation indexes, different membership functions are established respectively.
[0059] Wherein the weight of each evaluation index in step 5) is calculated by the analytic hierarchy process. Using 1-9 scale, first, all indexes are evaluated and scored by expert group, a judgment matrix is constructed, the judgment matrix is normalized, and the weights corresponding to the criterion layer and the index layer are obtained after consistency check.
[0060] Table 3 Scale and meaning of judgment matrix
[0061]
[0062] Judgment matrix (1-1)
[0063] Target layer (A) Governance effect (B1) Physico-chemical properties (B2) Environmental impact (B3) Public acceptance (B4) Governance effect (B1) 1 6 3 5 Physico-chemical properties (B2) 0.166666667 1 0.25 0.333333333 Environmental impact (B3) 0.333333333 4 1 4 Public acceptance (B4) 0.2 3 0.25 1
[0064] Judgment matrix (2-1)
[0065]
[0066] Judgment matrix (3-1)
[0067]
[0068] Judgment matrix (4-1)
[0069]
[0070] Judgment matrix (5-1)
[0071] Public acceptance (B4) Environmental satisfaction (U11) Economic satisfaction (U12) Environmental satisfaction (U11) 1 3 Economic satisfaction (U12) 0.333333333 1
[0072] The above matrix is normalized to obtain the weights corresponding to the criterion layer and the target layer, and the results are as follows:
[0073] (1) The weight corresponding to the target layer A criterion layer, W B1 = 0.553, W B2 = 0.062, W B3 = 0.273, W B4 = 0.112;
[0074] (2) The weight corresponding to the criterion layer B1 index layer, W U1 = 0.250, W U2 = 0.655, W U3 = 0.095;
[0075] (3) The weight corresponding to the criterion layer B2 index layer, W U4 = 0.429, W U5 = 0.142, W U6 = 0.429;
[0076] (4) The weight corresponding to the criterion layer B3 index layer, W U7 = 0.148, W U8 = 0.148, W U9 = 0.647, W U10 = 0.057.
[0077] (5) The weight corresponding to the criterion layer B4 index layer, W U11 = 0.750, W U12 = 0.250.
[0078] The weight matrix W = (0.138, 0.362, 0.053, 0.027, 0.040, 0.040, 0.177, 0.016, 0.084, 0.028)
[0079] The fuzzy comprehensive evaluation result matrix in step 6) is The "weighted average type" operator is used to sum the products and then sum the results.
[0080]
[0081] The maximum membership degree principle is used to determine the comprehensive evaluation grade of the soil remediation effect in step 7), and the evaluation grade corresponding to the maximum value in the matrix is selected as the evaluation result.
[0082] Table 4 Evaluation index and weight table
[0083]
[0084]
[0085] A steel plant in Shandong Province is taken as an example to illustrate the repair of benzo (a) pyrene contaminated soil.
[0086] The land is planned to be used as a class I land in the future, and the benzo (a) pyrene is repaired by ex-situ thermal desorption technology. After the effect evaluation sampling confirmation, the content of benzo (a) pyrene in the repaired soil is lower than the repair target value.
[0087] In this example, according to the land pollution investigation report and risk assessment report, the average content of benzene(a) pyrene in the soil before remediation was 2.68 mg / kg, the target value of benzene(a) pyrene remediation was 0.72 mg / kg, and the screening value of benzene(a) pyrene in the soil of the first type of land was 0.55 mg / kg. The benzene(a) pyrene was remediated by ex-situ thermal desorption technology, the addition amount of quicklime was 2.1%, and the average content of benzene(a) pyrene in the soil after remediation was 0.30 mg / kg.
[0088] The soil remediation effect evaluation collected 50 samples, of which 2 samples did not meet the remediation target value and met the standard after re-remediation. The pH of the soil after remediation increased from 7.3 to 8.2, the soil color changed greatly, the soil sand content increased significantly, the organic matter content decreased from 36.2 g / kg to 7.5 g / kg, the dioxin generated during the remediation process met the standard emission, the amount of waste produced was less, and all met the standard emission. According to the interviews with 22 surrounding residents, 2 expressed negative environmental impact of the remediation project, and 15 expressed positive impact of the implementation of the remediation project on economic improvement. During the implementation of the project, no pollution accident occurred.
[0089]
[0090]
[0091] After the benzene(a) pyrene contaminated soil in the local plot was remediated by thermal desorption technology, it reached "good" according to the principle of maximum membership degree, which was consistent with the actual situation.
[0092] Each of the embodiments in the specification is described in a progressive manner, and the same and similar parts between each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.
[0093] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.
Claims
1. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land, characterized in that: The method comprises the following steps: 1) Using expert consultation and theoretical analysis methods to screen key technical parameters that can characterize soil remediation effects, and construct a set of evaluation indicators U for contaminated soil remediation effects; 2) Construct a fuzzy evaluation comment set V; 3) Obtain the results of various evaluation indicators in the soil before and after remediation; 4) According to the membership principle, determine the membership of each evaluation index and obtain the fuzzy evaluation matrix R; 5) Use the hierarchical analysis method to determine the relative criticality of each evaluation indicator, calculate the weight of each indicator, and obtain the weight matrix W; 6) Using the weighted average operator, calculate the fuzzy comprehensive evaluation result matrix H; 7) According to the maximum membership principle, the comprehensive evaluation level of soil remediation effect is determined by the matrix H.
2. A comprehensive evaluation and grading method for the remediation effect of contaminated soil in construction land according to claim 1, characterized in that: The remediation technology applicable to the comprehensive evaluation of soil remediation effect is soil source reduction remediation technology, including leaching, chemical oxidation, thermal desorption, gas phase drawer or room temperature analysis.
3. A comprehensive evaluation method for the remediation effect of contaminated soil in construction land according to claim 1, characterized in that: The evaluation index set U described in step 1) is divided into three layers: target layer, criterion layer, and index layer; The target layer includes governance effect index B1, physical and chemical property index B2, environmental impact index B3 and public recognition index B4; The treatment effect index B1 includes the target pollutant reduction rate U1, the residual pollution index U2, and the restoration effect stability coefficient U3; Physical and chemical property index B2 includes soil pH U4, soil texture U5 and soil organic matter U6; Environmental impact indicators B3 include the generation of toxic and hazardous substances (U7), pollutant discharge compliance (U8), pollution accidents (U9), and the increase in pharmaceutical agents (U10); Public recognition indicator B4 includes public satisfaction with the environment brought about by the restoration project (U11) and economic satisfaction (U12); U={U1,U2,U3...U11,U12} The target pollutant reduction rate U1 is specifically calculated as follows: U1=min((x i0 -x c ) / x c )×100% (1) In formula (1), U1 is the soil pollutant reduction rate (%), x i0 is the content of target pollutant i in the soil before remediation (mg / kg), x i is the residual content of target pollutant i in the soil after remediation (mg / kg); The residual pollution index U2 is specifically calculated as follows: U2=max(x i / x SVi ) (2) In formula (2), U2 is the residual pollution index (dimensionless), x SVi is the screening value (mg / kg) of a target pollutant i under the planned land use type. For details, please refer to GB36600-2018 and local standards; The repair effect stability coefficient U3 is specifically calculated as follows: U3=S i / S T ×100% (3) In formula (3), U3 is the primary remediation compliance rate of the target pollutant (%), S i The number of samples that meet the standards in the restoration effect evaluation phase (pieces), S T The total number of samples collected during the restoration effect evaluation phase (pieces); The specific calculation formulas for environmental satisfaction U11 and economic satisfaction U12 are as follows: U11 or U12 = P i / P T ×100% (4) In formula (4), U11 / U12 is satisfaction (%), P i The number of residents in the surrounding area who approved the restoration project (P T The total number of residents interviewed (persons), with no less than 20 people interviewed.
4. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: In step 2), the fuzzy evaluation comment set V = {v1, v2, ..., v m }, the evaluation indicators are divided into 4 levels: excellent, good, medium, and qualified, forming the comment set V = {excellent, good, medium, qualified} (m = 4).
5. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: In step 3), the results of various evaluation indicators in the soil before and after remediation are obtained. The results of various evaluation indicators before remediation are obtained through the soil pollution status investigation report and risk assessment report. The results of various evaluation indicators after remediation can be obtained from the environmental supervision report, remediation effect evaluation report or through laboratory analysis and testing. The public acceptance index can be obtained through personnel interviews.
6. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: In step 4), the fuzzy evaluation matrix R is calculated by the membership function. Each row in R reflects the membership of the index value in the four evaluation intervals. Different membership functions are established for qualitative and quantitative evaluation indicators respectively. The qualitative evaluation indicators include soil texture (U5), toxic and hazardous substance generation (U7), pollutant emission compliance (U8), and pollution accident status (U9); The quantitative evaluation indicators include target pollutant reduction rate U1, residual pollution index U2, remediation effect stability coefficient U3, soil pH U4, organic matter U6, agent increase U10, environmental satisfaction U11, and economic satisfaction U12; The degree to which a qualitative evaluation indicator belongs to the mth evaluation level (m = excellent, good, medium, qualified) m for: A certain quantitative evaluation index adopts a semi-trapezoidal membership function, as shown in formulas (6) and (7). Where: u ij (x) is the membership degree of a certain indicator, x i The measured value of a certain indicator in the soil after repair, a ij is the j-level standard of the i-th indicator of the remediated soil (j = excellent, good, medium, qualified).
7. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: In step 5), the weight calculation method of each evaluation index is determined to be the hierarchical analysis method, and the nine-scale method is used to establish 5 matrices: A = {B1, B2, B3, B4} (matrix 1-1), B1 = (U1, U2, U3) (matrix 2-1), B2 = (U4, U5, U6} (matrix 3-1), B3 = (U7, U8, U9, U10) (matrix 4-1), B5=(U11,U12)(Matrix 5-1); obtain the corresponding values in each judgment matrix according to the expert group scoring method; The judgment matrix is normalized and the weights corresponding to the criterion layer and the indicator layer are obtained after consistency test. The weight matrix W corresponding to the target layer is obtained by multiplying them. In=(in1,in2,…in 11 ,In 12 ) The expert group consists of 4 people from the environmental management department, 8 industry experts, 6 people from restoration companies, and 4 people from the owner units, and the scoring weights are 0.3, 03, 0.2, and 0.2 respectively.
8. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: Fuzzy comprehensive evaluation result matrix in step 6) is the weighted average operator.
9. A comprehensive evaluation and grading method for the remediation effect of contaminated soil on construction land according to claim 1, characterized in that: The comprehensive evaluation grade of the soil remediation effect described in step 9) is determined by the maximum membership principle of H, and the evaluation grade corresponding to the maximum value in the matrix is selected as the evaluation result.