CN112990717A - Method for evaluating pollution source intensity of electroplating site - Google Patents
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Abstract
A method for evaluating pollution source intensity of an electroplating site comprises the steps of determining 56 indexes as a source intensity evaluation index alternative index library; considering the optimization analysis of the indexes by considering the optimization requirements of the prior concern problem on the indexes and the optimization requirements of the mathematical evaluation method on the indexes, adjusting and optimizing the indexes, and constructing an electroplating field soil pollution source intensity evaluation index system according to the characteristics of an actual research object; determining a reference standard according to the existing national standard and international standard and according to the regional soil environment quality and the target of environmental management; calculating a weight coefficient of the index by adopting an analytic hierarchy process to determine the weight of an evaluation index system; evaluating the scheme layer by adopting a grading and step-by-step weighting method, calculating a soil pollution source intensity index of the electroplating site, and finally dividing the soil pollution source intensity index into four intensities according to the index intensity; the field with higher pollution source strength is identified by calculating the pollution source strength index, so that risk prevention and control are enhanced, soil is prevented from being polluted and then is treated, and prevention is performed in advance.
Description
Technical Field
The invention relates to the field of plastic manufacturing, in particular to a method for evaluating the pollution source intensity of an electroplating site.
Background
Although China has great progress in the aspect of risk prevention and control of electroplating enterprises, generally speaking, China has low research degree in the aspect of soil pollution source intensity evaluation of fields and few research situations of specific fields, so that the support of the pollution source intensity evaluation research work needs to be increased, and technical documents such as a soil pollution risk evaluation guideline and a technical guide rule of relevant electroplating fields suitable for the Kyowa area in China are gradually established and perfected. At present, a method and a system for evaluating the soil pollution source strength of an electroplating site in China are not established, and scientific basis is lacked.
Disclosure of Invention
The invention aims to provide a method for evaluating the pollution source intensity of an electroplating site, which can effectively solve the problems in the background technology.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a method for evaluating the pollution source intensity of an electroplating site comprises the following steps:
the method comprises the following steps: constructing a source strength evaluation index alternative index library;
step two: performing optimization analysis on indexes of the alternative index library;
step three: constructing a source intensity evaluation index system;
step four: determining a reference standard;
step five: determining an evaluation index system weight;
step six: calculating a source intensity evaluation index;
step seven: and (3) according to the intensity index of the soil pollution source in the electroplating field, evaluating the intensity of the pollution source into four grades of strong, medium and weak.
As a further preferable embodiment of the present invention, the preferable index in the second step is an indication index, a data availability index, a comparable index, or an independent index.
As a further preferable scheme of the invention, the source intensity evaluation index system in the third step is based on the alternative index optimization analysis in the second step, and is adjusted, optimized and combined with the characteristics of an actual research object to construct an electroplating site soil pollution source intensity evaluation index system.
As a further preferable scheme of the invention, the evaluation index system in the third step is composed of a target layer, a scheme layer and a factor layer, the factor layer indexes are optimized for different electroplating sites, and then other layer representative indexes are selected to be combined to form the evaluation index system; the method comprises 5 target schemes of a management level index, a pollutant emission index, a migration conversion index, a soil pollution current situation index and a soil pollution receptor, 9 evaluation elements and 40 evaluation indexes.
As a further preferable scheme of the invention, the index standard value in the fourth step refers to national standard and international standard; and taking the target of regional soil environment quality and environment management as a reference standard.
As a further preferable scheme of the present invention, the fifth step of determining the evaluation index weight performs non-dimensionalization preprocessing and standardization on the index data according to the Weber-fisher law; and calculating the weight coefficient of the index by an entropy method and an analytic hierarchy process.
As a further preferable scheme of the invention, the sixth step adopts a method of grading in grades and weighting in grades to evaluate the scheme layer, wherein the method comprises calculation of the score of the index layer, calculation of the weight of the scheme layer by the index layer and calculation of the score of the scheme layer; and then calculating the soil pollution source intensity index of the electroplating site by adopting a weighted summation method.
Compared with the prior art, the invention provides a method for evaluating the pollution source intensity of an electroplating site, which has the following beneficial effects:
the method is simple in calculation and convenient to use, and the field with higher pollution source strength is identified by calculating the pollution source strength index, so that risk prevention and control are enhanced, soil is prevented from being polluted and then is remedied, and early prevention is achieved.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of the A-B decision matrix in the analytic hierarchy process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, the invention provides a method for evaluating the pollution source intensity of an electroplating site, which comprises the following steps:
the method comprises the following steps: constructing a source strength evaluation index alternative index library;
step two: performing optimization analysis on indexes of the alternative index library;
step three: constructing a source intensity evaluation index system;
step four: determining a reference standard;
step five: determining an evaluation index system weight;
step six: calculating a source intensity evaluation index;
step seven: and (3) according to the intensity index of the soil pollution source in the electroplating field, evaluating the intensity of the pollution source into four grades of strong, medium and weak.
As a further preferable embodiment of the present invention, the preferable index in the second step is an indication index, a data availability index, a comparable index, or an independent index.
As a further preferable scheme of the invention, the source intensity evaluation index system in the third step is based on the alternative index optimization analysis in the second step, and is adjusted, optimized and combined with the characteristics of an actual research object to construct an electroplating site soil pollution source intensity evaluation index system.
As a further preferable scheme of the invention, the evaluation index system in the third step is composed of a target layer, a scheme layer and a factor layer, the factor layer indexes are optimized for different electroplating sites, and then other layer representative indexes are selected to be combined to form the evaluation index system; the method comprises 5 target schemes of a management level index, a pollutant emission index, a migration conversion index, a soil pollution current situation index and a soil pollution receptor, 9 evaluation elements and 40 evaluation indexes.
As a further preferable scheme of the invention, the index standard value in the fourth step refers to national standard and international standard; and taking the target of regional soil environment quality and environment management as a reference standard.
As a further preferable scheme of the present invention, the fifth step of determining the evaluation index weight performs non-dimensionalization preprocessing and standardization on the index data according to the Weber-fisher law; and calculating the weight coefficient of the index by an entropy method and an analytic hierarchy process.
As a further preferable scheme of the invention, the sixth step adopts a method of grading in grades and weighting in grades to evaluate the scheme layer, wherein the method comprises calculation of the score of the index layer, calculation of the weight of the scheme layer by the index layer and calculation of the score of the scheme layer; and then calculating the soil pollution source intensity index of the electroplating site by adopting a weighted summation method.
As a specific embodiment of the present invention:
determining 56 indexes as a candidate index library for constructing source strength evaluation indexes; simultaneously, considering the optimization analysis of the indexes by considering the optimization requirements of the prior concern problem on the indexes and the optimization requirements of the mathematical evaluation method on the indexes, adjusting and optimizing the indexes after the optimization analysis, and constructing an electroplating field soil pollution source intensity evaluation index system according to the characteristics of actual research objects; and determining the reference standard according to the existing national standard and international standard and according to the regional soil environment quality and the target of environmental management.
According to the Weber-Fishna law, the indexes are subjected to dimensionless and standardization:
forward type index: r isij＝xij/Sij(ii) a Negative type index: r isij＝Sij/xij(ii) a In the formula，xijIs the measured value of the index i at the sampling point j; sijIs a reference standard for the index factor; r isijTo evaluate the dimensionless value of the index, it is necessary to satisfy 0. ltoreq. rijLess than or equal to 1, and more than 1, according to the value of 1.
For the index not conforming to the Weber-Fishna law, the conversion method should be determined from the mass-effect change analysis by taking the law into account. For the index with threshold, the threshold is used as standard value to perform conversion within the threshold, and 0 treatment is performed outside the threshold.
Constructing a judgment matrix Z of m evaluation indexes of n samples:
carrying out non-dimensionalization processing on the data to obtain a new judgment matrix, wherein the expression of elements is as follows: r ═ R (R)ijn×m)；
According to the definition of entropy, n samples of m evaluation indexes, the entropy of the evaluation indexes can be determined as follows:
wherein H is more than or equal to 0iLess than or equal to 1, in order to make lnfijMeaningful, suppose fij＝0，fijlnfij＝0， i＝1,2,…,n；j＝1,2,…,m。
Evaluating entropy weight (W) of an indexj) The calculation of (2):
Calculating a weight coefficient of the index by adopting an Analytic Hierarchy Process (AHP) to determine the weight of an evaluation index system; constructing a judgment matrix, and solving the judgment matrix by using a product method: based on the decision matrix shown in FIG. 2, the overall goal is determined by giving each factorSex weight, first dummy wiE (0,1) is a factor xiIs weighted in importance, and
W＝(w1,w2,…,wn)Tis the weight vector. By W ═ W1,w2,…,wn)TMultiplying matrix A right, the result is:
according to the matrix theory, n is the only non-0 and largest feature root of the above judgment matrix a, and W is the corresponding normalized feature vector.
Applications of
Solving the maximum eigenvalue of the judgment matrix; then brought in
And
calculating a consistency index CI and a consistency ratio CR of the judgment matrix, and checking the consistency of the indexes;
wherein A is A-B judgment matrix, n is judgment matrix order, and lambdamaxJudging the maximum eigenvalue of the matrix; and judging that the higher the consistency degree of the matrix is, the smaller the CI value is. When CI is 0, judging that the matrixes are completely consistent; in order to obtain a consistency check critical value applicable to judgment matrixes with different orders, the influence of the orders of the matrixes is eliminated;
solving the problem by using a consistency ratio in an analytic hierarchy process, and introducing an average random consistency index RI, wherein the RI is a correction coefficient for eliminating judgment matrix inconsistency caused by the influence of matrix orders;
in general, for a decision matrix of order n ≧ 3, when CR ≦ 0.1, i.e., λmaxDeviation fromWhen the relative error CI of n does not exceed one tenth of the average random consistency index RI, the consistency of the judgment matrix is generally considered to be acceptable; otherwise, when CR is greater than 0.1, the judgment matrix deviates from the consistency degree too much, and necessary adjustment is carried out on the judgment matrix to ensure that the judgment matrix has consistency.
After determining the weight of the lower-layer index to the higher index, determining the weight of the lowest-layer index to the highest-layer index according to the hierarchical weighting law of the analytic hierarchy process AHP; is provided with
Is the weight vector of the k-th layer index to the k-1-th layer j index (j is 1,2, …, m, m is the number of k-1 layer indexes), the weight vector of the k-layer index to the k-2-layer i index is:
the total hierarchical ordering uses the results of all the single orderings to calculate the relative importance ordering weight of all the elements of the hierarchy for the target, namely the weighted combination of the single hierarchical orderings. The expression of the consistency test of the total hierarchical ordering on the calculation result is as follows:
wherein: m is the number of elements of the second layer; a isiIs the weight of the elements of the second layer relative to the first layer, when CR is<At 0.1, the overall ranking result of the hierarchy has satisfactory consistency.
Evaluating the scheme layer by adopting a grading and weighting method and calculating the soil pollution source intensity index of the electroplating site according to the weight of the evaluation index system; and (3) calculating the score of the index layer, determining the type of the evaluation index according to the original data of the evaluation index and the corresponding standard value, and calculating the score of the evaluation index by using a data preprocessing formula, namely a dimensionless value (rij).
The calculation expression of the weight of the index layer to the scheme layer is：W(CA)i＝Wi×W(BA)I(ii) a Wherein W (CA)iThe weight coefficient of the index factor of the layer C relative to the scheme layer A; wiThe weighting coefficient of the ith index factor of the C layer relative to the factor layer B; w (BA)iIs the weight coefficient of factor layer B relative to scheme layer a; after the dimensionless value and the index weight of each index are determined, substituting the following formula:
wherein A iskCalculating a result for the kth solution level score; r isijTo evaluate the dimensionless value of the index, where 0. ltoreq. r is satisfiedijLess than or equal to 1, and the value is greater than 1 according to the formula; w (CA)iIs the weight coefficient of the layer C indicator factor relative to the scheme layer a.
The target layer is evaluated, namely the comprehensive evaluation of the pollution source intensity is carried out, the soil Pollution Source Intensity Index (PSII) of the electroplating field is calculated by adopting a weighted summation method, and the result is 1 numerical value of 1-100:
wherein PSII is an index of the intensity of a soil pollution source of an electroplating field; a. thekIs the score value of the kth scheme layer; wkThe weighting factor for the kth scheme layer to the target layer.
Finally, the intensity is divided into four intensities according to the index.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for evaluating the pollution source intensity of an electroplating site comprises the following steps:
the method comprises the following steps: constructing a source strength evaluation index alternative index library;
step two: performing optimization analysis on indexes of the alternative index library;
step three: constructing a source intensity evaluation index system;
step four: determining a reference standard;
step five: determining an evaluation index system weight;
step six: calculating a source intensity evaluation index;
step seven: and (3) according to the intensity index of the soil pollution source in the electroplating field, evaluating the intensity of the pollution source into four grades of strong, medium and weak.
2. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein the preferable indexes in the second step are indication indexes, data available indexes, comparable indexes and independent indexes.
3. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein the source intensity evaluation index system in the third step is adjusted and optimized based on the alternative index optimization analysis in the second step, and is combined with the characteristics of an actual research object to construct the soil pollution source intensity evaluation index system of the electroplating site.
4. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein the evaluation index system in the third step is composed of a target layer, a scheme layer and a factor layer, indexes of the factor layer are optimized for different electroplating sites, and then other layer representative indexes are selected to be combined to form the evaluation index system; the method comprises 5 target schemes of a management level index, a pollutant emission index, a migration conversion index, a soil pollution current situation index and a soil pollution receptor, 9 evaluation elements and 40 evaluation indexes.
5. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein in the fourth step, standard values of indexes refer to national standards and international standards; and taking the target of regional soil environment quality and environment management as a reference standard.
6. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein the fifth step of determining the evaluation index weight performs dimensionless preprocessing and standardization on index data according to Weber-Fishna law; and calculating the weight coefficient of the index by an entropy method and an analytic hierarchy process.
7. The method for evaluating the pollution source intensity of the electroplating site according to claim 1, wherein the sixth step adopts a grading and step-by-step weighting method to evaluate the scheme layer, wherein the evaluation method comprises calculation of the score of the index layer, calculation of the weight of the scheme layer by the index layer and calculation of the score of the scheme layer; and then calculating a soil Pollution Source Intensity Index (PSII) of the electroplating site by adopting a weighted summation method.
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Application publication date: 20210618 |