CN111915469A - Batch evaluation method for cadmium emission intensity of cadmium-related enterprises in regional range - Google Patents
Batch evaluation method for cadmium emission intensity of cadmium-related enterprises in regional range Download PDFInfo
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- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 285
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 285
- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 44
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 11
- 230000009193 crawling Effects 0.000 claims description 8
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000011835 investigation Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 238000005206 flow analysis Methods 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000002686 phosphate fertilizer Substances 0.000 claims description 4
- 239000000049 pigment Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910000925 Cd alloy Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 150000001661 cadmium Chemical class 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000012141 concentrate Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 238000012937 correction Methods 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 239000003337 fertilizer Substances 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 230000007717 exclusion Effects 0.000 claims 2
- 238000006477 desulfuration reaction Methods 0.000 claims 1
- 230000023556 desulfurization Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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Abstract
The invention relates to a batch evaluation method for cadmium emission intensity of cadmium-related enterprises in a regional range, which comprises the following steps: 1) firstly, analyzing the average content range of cadmium in products and raw materials of various cadmium-related industry subclasses by combining with literature, and acquiring the historical yield and the required quantity of the cadmium-related products and the raw materials of the cadmium-related products under different cadmium-related industry subclasses in the country by counting yearbooks, so as to calculate the historical yield and the average cadmium discharge coefficient of the cadmium-related industry subclasses according to material balance; 2) based on the preliminarily obtained cadmium-related enterprise directory information, calculating the total cadmium discharge amount of the enterprise in the life cycle of the enterprise under each cadmium-related industry subclass by taking the enterprise point location as a basic unit and combining production elements; calculating the total cadmium emission amount in the life cycle of a certain cadmium-related enterprise: the total cadmium discharge amount in a life cycle of a cadmium-related enterprise is equal to the average cadmium discharge coefficient of a subclass of the industry to which the enterprise belongs and the average production capacity of the enterprise for many years; and finally, calculating to obtain the accumulated cadmium discharge amount of each cadmium-related enterprise and forming a complete cadmium-related enterprise directory.
Description
Technical Field
The invention relates to the technical field of cadmium-related enterprise information processing, in particular to a batch evaluation method for cadmium emission intensity of cadmium-related enterprises in an area range.
Background
In the prior art, enterprise data related to cadmium industry mainly comprises data of year-round systems and pollution source general investigation data of national ecological environment protection related functional departments, data accuracy and authority are guaranteed to a certain extent, but the data collection mode is mainly obtained through local accounting and step-by-step gathering and reporting, so that the timeliness and integrity of information are insufficient, cadmium discharge data which can be disclosed in an enterprise level are extremely limited, the existing data are mostly annual discharge data, the accumulated cadmium discharge total amount of cadmium related enterprise points in the life cycle of the cadmium related enterprise points cannot be specifically mastered, the timeliness and integrity of the discharge information are large, and a reliable, rapid and practical technical method for estimating the accumulated cadmium discharge intensity of cadmium related enterprises in a large area and even nationwide does not exist in the prior art.
In addition, in view of the fact that pollution emission online monitoring information of most of small and medium-sized enterprises cannot be obtained in a public mode or early self monitoring information is lost, and meanwhile historical pollution discharge data on a time sequence are difficult to trace, cadmium emission intensity estimation of cadmium-related enterprises is difficult to achieve.
Disclosure of Invention
The invention aims to provide a method for evaluating cadmium-related enterprise cadmium emission intensity in batches in an area range, and solves the technical problem of how to realize batch evaluation and reliability evaluation of cadmium-related enterprise cadmium emission intensity in the area range.
In order to achieve the purpose, the invention provides a batch evaluation method for cadmium-related enterprise accumulated cadmium emission intensity in an area range, which comprises the following steps:
1) firstly, analyzing the average content range of cadmium in products and raw materials of various cadmium-related industry subclasses by combining with literature, acquiring the annual output and the required quantity of the cadmium-related products and the raw materials of the cadmium-related products under different cadmium-related industry subclasses in the country by counting yearbook, and then obtaining the annual cadmium emission quantity in the production process of the subclasses of the cadmium-related industry by analyzing the material flow in the country and calculating the quality balance, thereby calculating the annual and average cadmium emission coefficients of the subclasses of the cadmium-related industry;
2) based on the preliminarily obtained cadmium-related enterprise directory information, estimating the total cadmium discharge amount of the enterprise in the life cycle of the enterprise under each cadmium-related industry subclass by taking the enterprise point location as a basic unit and combining production elements:
for enterprises with complete production element information, the total cadmium emission amount of the enterprises in the subclass of cadmium-related industries in the life cycle of the enterprises is estimated according to the following ideal calculation formula:
Fi，t＝Qi，t×i，t
wherein:
the total cadmium discharge unit is ton in the life cycle of an enterprise j under a subclass i of the cadmium-related industry; t is year;
the unit of the cadmium discharge coefficient is gram/ton-product of the subclass i in the cadmium industry in the t year;
the yield of an enterprise j under a subclass i related to cadmium industry is ton in unit;
the input quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the output quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the import quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the unit is ton, which is the cadmium export quantity of subclass i in the cadmium-related industry in the t year;
in the t year, the discharge amount of cadmium to the environment is from subclass i of cadmium-related industry, and the unit is ton; qi，tAndi，trespectively representing the corresponding product or raw material flow of the subclass i in the cadmium-related industry in the t year, specifically comprising the output quantity, the inlet quantity and the outlet quantity of the product and the input quantity, the inlet quantity and the outlet quantity of the raw material, wherein the unit is ton;i，trespectively representing the average cadmium content in the products or raw materials corresponding to the subclass i in the t year in the cadmium industry, wherein the unit is gram/ton, and the cadmium content in the specific products or raw materials is set as a fixed value.
For cadmium-related enterprises with incomplete production elements, adopting the average capacity in many years in a specific time period, adopting the average cadmium discharge coefficient in many years of the subclasses of the industry calculated by the national material flow analysis and the quality balance to replace the cadmium discharge coefficient of each subclass of the cadmium-related industry in all years, and calculating the total cadmium discharge amount in the life cycle of a certain cadmium-related enterprise according to the following calculation formula:
Fi，t＝Qi，t×i，t
wherein:
the average cadmium discharge coefficient of the subclass i in the cadmium industry during delta t years is expressed in grams/ton-product;
the method is the average capacity of enterprises j under subclass i of cadmium related industry for many years, and the unit is ton; t isi，jThe storage duration time of an enterprise j under a subclass i related to the cadmium industry is expressed in a unit of year.
And finally, calculating according to different situations to obtain the accumulated cadmium discharge amount of each cadmium-related enterprise and forming a complete cadmium-related enterprise directory.
Preferably, the average cadmium content range in the subclass products and raw materials related to the cadmium industry comprises the average cadmium content in ore raw materials and concentrates or refined products related to the mining, selecting and smelting of colored/black metal ores, nickel-cadmium batteries, solar batteries, plastics, glass, limestone, cement, phosphate ores and phosphate fertilizers.
Further preferably, the batch evaluation method for the enterprise accumulated cadmium emission intensity is divided into two cases, namely an enterprise with complete production element information and a cadmium-related enterprise with incomplete production elements.
Further preferably, the business duration is divided into a closed or stopped business duration and a business duration still in progress.
The preliminarily obtained directory information of the cadmium-related enterprise is constructed according to the following steps:
firstly, determining the specific cadmium industry: for the cadmium-related industry, there are two main categories: one is related to the industry of cadmium raw materials, and the other is related to the industry of cadmium impurities;
secondly, on the basis of determining the specific cadmium-related industry, crawling various data information about cadmium-related enterprises, which are disclosed on the internet by national and local ecological environment protection-related functional departments, and performing formatting treatment;
thirdly, a national industry and commerce credit investigation system and a third-party data set are used as data sources for crawling cadmium-related enterprise information network big data, and a cadmium-related industry enterprise supplementary directory is obtained through crawling of the determined cadmium-related industry type and search keywords;
fourthly, further integrating the data extracted based on the network big data and the nationwide cadmium-related enterprise directory information which is perfect through department public data, and cleaning the data of the integrated data set, wherein the cleaning includes removing duplication, correcting the spatial position, distributing and the like;
the data cleaning principle is as follows:
A. firstly, carrying out unsupervised cleaning: a data cleaning algorithm is predefined, the computer automatically executes the algorithm to clean the data set, and then a cleaning report is generated;
B. and then carrying out supervised cleaning: analyzing the collected data under the guidance of field experts, manually removing obvious noise data and repeatedly recording, and filling up the missing value data;
and fifthly, combining the address of the enterprise and the POI information of the network map to acquire the preliminary longitude and latitude information of the cadmium-related enterprise with the missing spatial position, converting a coordinate system according to the uniform spatial information mathematical basis of the project, and realizing standardization according to a uniform data structure, thereby forming a preliminary cadmium-related enterprise directory.
The cadmium-related raw material industry is a production enterprise taking cadmium as one of raw materials.
The cadmium-related impurity industry is the cadmium-related industry in which cadmium appears as an impurity in the production process.
The cadmium-related raw material industry comprises enterprises in the industries of nickel-cadmium battery or solar battery production, cadmium-containing pigment, plastic, glass and ceramic production, cadmium alloy manufacturing and cadmium plating.
The cadmium-related impurity industry comprises non-ferrous metal ore mining and smelting, steel dressing and smelting, and cement and phosphate fertilizer production.
The cleaning of the data comprises the elimination of irrelevant enterprises such as duplication removal, spatial position correction, distribution and the like.
The unsupervised cleaning comprises the deletion of enterprises which are related to, do not contain, do not relate to, exclude, remove, desulfurize, do not contain phosphorus and lead in the operation range; the enterprise for deleting, selling, storing and transporting comprises the enterprise name and the enterprise which contains selling, purchasing, exchanging and exporting in the operation range and does not contain the enterprises for collecting, selecting, processing, producing, smelting and manufacturing characters.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the method is based on literature statistical data and a material conservation method, meanwhile, the estimation of the cadmium emission amount accumulated by enterprises under the corresponding cadmium-related industry subclasses is carried out by fully considering the cadmium emission capacity difference conditions of the different cadmium-related industry subclasses, the industry emission capacity difference is fully considered, and the reliability of the estimation of the cadmium emission intensity of the cadmium-related enterprises in the area range can be further improved by distinguishing the cadmium emission capacity difference of the enterprises under the different industry subclasses.
Detailed Description
The present invention is described in more detail below to facilitate an understanding of the present invention.
Before introducing the cadmium-related enterprise cadmium emission intensity evaluation method, firstly introducing a cadmium-related enterprise directory construction method based on industry differences, comprising the following steps of:
1) determining the industry specifically related to cadmium: for the cadmium-related industry, there are two main categories: one is a production enterprise (related to cadmium raw material industry) taking cadmium as one of raw materials, and the other is a cadmium-related industry (related to cadmium impurity industry) taking cadmium as an impurity in the production process. The former mainly comprises the enterprises of industries such as nickel-cadmium cell/solar cell production, cadmium-containing pigment, plastics, glass, ceramic production, cadmium alloy manufacturing, cadmium plating and the like, wherein the most main application field of directly using cadmium is the cell industry, nearly 86% of the global cadmium is applied to manufacturing the nickel-cadmium cell currently, 9% is used for producing the pigment, 4% is used for producing the coating, 1% is used for producing the alloy, a solar cell panel and a stabilizer; the cadmium-related industry appearing as impurities mainly comprises the mining and the smelting of non-ferrous metal ores such as copper, lead and zinc, the selection and the smelting of steel, the production and the manufacture of cement, phosphate fertilizer and the like.
The current major cadmium-related industry in China is classified according to the latest national economic industry (2017) as shown in Table 1.
TABLE 1 cadmium industry types and search keywords therefor
2) On the basis of determining the specific cadmium-related industry, various data information related to cadmium enterprises, which is disclosed on the internet by national and local ecological environment protection related functional departments, is crawled and formatted.
The types of government public data that need to be crawled are shown in table 2.
TABLE 2 partial government department public data types that need to be crawled
| Serial number | Public data of government department |
| 1 | List of enterprises supervising soil environment |
| 2 | Key monitoring enterprise list |
| 3 | List of key sewage disposal units |
| 4 | Full-aperture list of enterprises in heavy metal-related major industry |
| 5 | Essential information of heavy pollution source |
| 6 | List of hazardous waste operating units |
| 7 | Battery is disassembled and is utilized processing unit directory |
| 8 | National pollution discharge permission information platform public data |
| 9 | Notice of hazardous waste operating license issuing situation |
3) A national industry and commerce credit investigation system and a third-party data set (such as enterprise investigation and sky investigation) are used as data sources for crawling cadmium-related enterprise information network big data, and a cadmium-related industry enterprise supplementary directory is obtained through crawling by determined cadmium-related industry types and search keywords (see table 1).
4) And further integrating the data extracted based on the network big data and nationwide cadmium-related enterprise directory information which is perfect through department public data, and cleaning the data of the integrated data set, including removing duplication, correcting the spatial position, removing irrelevant enterprises such as distribution and the like.
The data cleansing principle is as follows:
1. firstly, carrying out unsupervised cleaning: according to a certain business rule, a data cleaning algorithm is predefined, the algorithm is automatically executed by a computer, the data set is cleaned, and then a cleaning report is generated. For example, deleting enterprises in the business segment that do not include, do not contain, do not involve, exclude, remove, desulfurize (smelting, chemical), do not contain phosphorus (chemical), do not contain lead (battery); and deleting the selling enterprises, namely enterprises which contain marketing, purchasing, facilitating and exporting in the operating range and do not contain characters of collection, selection, processing, production, smelting and manufacturing.
2. And then carrying out supervised cleaning: under the guidance of field experts, the collected data are analyzed, obvious noise data are manually removed, repeated records are manually recorded, and missing value data are filled.
5) And combining the address of the cadmium-related enterprise and the POI information of the network map to acquire the preliminary longitude and latitude information of the enterprise with the missing spatial position information, and converting a coordinate system according to the spatial information mathematical basis unified by the project to form a preliminary cadmium-related enterprise directory.
After information such as name, address, storage duration, industry type, spatial position, productivity/yield and the like of cadmium-related enterprises are acquired one by one, cadmium emission intensity information of the enterprises needs to be further estimated, and in view of the fact that pollution emission on-line monitoring information of most of small and medium-sized enterprises cannot be acquired in a public mode or information of the small and medium-sized enterprises is lost, historical pollution discharge data on a time sequence are difficult to trace.
In order to achieve the purpose, the invention provides a cadmium emission intensity evaluation method for cadmium-related enterprises in an area range based on industry difference, which comprises the following steps:
1) firstly, analyzing the average cadmium content range (such as the average cadmium content in zinc concentrate, refined zinc, nickel-cadmium batteries and phosphate fertilizer) in the subclasses of the cadmium-related industry and the raw materials by combining the literature, obtaining the annual output and the demand of the cadmium-related products and the raw materials of the cadmium-related products in different subclasses of the cadmium-related industry in the country by counting yearbook, and then obtaining the annual cadmium emission in the production process of the cadmium-related industry by material flow analysis and quality balance calculation, thereby calculating the annual average cadmium emission coefficient and the average cadmium emission coefficient of the subclasses of the cadmium-related industry.
TABLE 3 statistics of cadmium concentrations in raw materials and products mainly related to cadmium industry obtained from literature
2) Based on the preliminarily obtained cadmium-related enterprise directory information, estimating the total cadmium discharge amount of the enterprise in the life cycle of the enterprise under each cadmium-related industry subclass by taking the enterprise point location as a basic unit and combining production elements:
for enterprises with complete production element information, the total cadmium emission amount of the enterprises in the subclass of cadmium-related industries in the life cycle of the enterprises is estimated according to the following ideal calculation formula:
Fi，t＝Qi，t×i，t
wherein:
the total cadmium discharge unit is ton in the life cycle of an enterprise j under a subclass i of the cadmium-related industry; t is year;
the unit of the cadmium discharge coefficient of the subclass i in the t year in the cadmium-related industry is gram/ton-product (namely the gram of cadmium discharged in the production process of each ton of product);
the production of enterprise j in the t year under the subclass i related to cadmium industryAmount in tons;
the input quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the output quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the import quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the unit is ton, which is the cadmium export quantity of subclass i in the cadmium-related industry in the t year;
in the t year, the discharge amount of cadmium to the environment is from subclass i of cadmium-related industry, and the unit is ton; qi，tAndi，trespectively representing the corresponding product or raw material flow of the subclass i in the cadmium-related industry in the t year, specifically comprising the output quantity, the inlet quantity and the outlet quantity of the product and the input quantity, the inlet quantity and the outlet quantity of the raw material, wherein the unit is ton;i，trespectively represent the average cadmium content in the corresponding product or raw material of the subclass i related to the cadmium industry in the t year, wherein the cadmium content in the specific product or raw material is set as a fixed value (see table 3).
For cadmium-related enterprises with incomplete production elements, adopting the average capacity in many years in a specific time period, adopting the average cadmium discharge coefficient in many years of the subclasses of the industry calculated by the national material flow analysis and the quality balance to replace the cadmium discharge coefficient of each subclass of the cadmium-related industry in all years, and calculating the total cadmium discharge amount in the life cycle of a certain cadmium-related enterprise according to the following calculation formula:
Fi，t＝Qi，t×i，t
wherein:
the average cadmium emission coefficient of subclass i in the cadmium industry during the year delta t (for example 1995-;
the method is the average capacity of enterprises j under subclass i of cadmium related industry for many years, and the unit is ton; t isi，jThe storage duration of the enterprise j under the subclass i related to the cadmium industry is calculated in units of years according to two conditions of the storage duration of the closed or stopped enterprise and the storage duration of the still-in-production enterprise.
And finally, estimating the accumulated Cd discharge amount of each cadmium-related enterprise according to different situations to form a complete cadmium-related enterprise directory.
The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.
Claims (9)
1. The method for evaluating cadmium-related enterprise cadmium emission intensity in batches in an area range is characterized by comprising the following steps of:
1) firstly, analyzing the average content range of cadmium in products and raw materials of various cadmium-related industry subclasses by combining with literature, acquiring the annual output and the required quantity of the cadmium-related products and the raw materials of the cadmium-related products under different cadmium-related industry subclasses in the country by counting yearbook, and then obtaining the annual cadmium emission quantity in the production process of the subclasses of the cadmium-related industry by analyzing the material flow in the country and calculating the quality balance, thereby calculating the annual and average cadmium emission coefficient of the subclasses of the cadmium-related industry;
2) based on the preliminarily obtained cadmium-related enterprise directory information, estimating the total cadmium discharge amount of the enterprise in the life cycle of the enterprise under each cadmium-related industry subclass by taking the enterprise point location as a basic unit and combining production elements:
for enterprises with complete production element information, the total cadmium emission amount of the enterprises in the subclass of cadmium-related industries in the life cycle of the enterprises is estimated according to the following ideal calculation formula:
Fi，t＝Qi，t×i，t
wherein:
the total cadmium discharge unit is ton in the life cycle of an enterprise j under a subclass i of the cadmium-related industry; t is year;
the unit of the cadmium discharge coefficient is gram/ton-product of the subclass i in the cadmium industry in the t year;
the yield of an enterprise j under a subclass i related to cadmium industry is ton in unit;
the input quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the output quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the import quantity of cadmium in the subclass i of the cadmium-related industry in the t year is ton;
the unit is ton, which is the cadmium export quantity of subclass i in the cadmium-related industry in the t year;
in the t year, the discharge amount of cadmium to the environment is from subclass i of cadmium-related industry, and the unit is ton; qi，tAndi，trespectively representing the corresponding product or raw material flow of the subclass i in the cadmium-related industry in the t year, specifically comprising the output quantity, the inlet quantity and the outlet quantity of the product and the input quantity, the inlet quantity and the outlet quantity of the raw material, wherein the unit is ton;i，trepresenting the average cadmium content in the products or raw materials corresponding to the subclass i in the t year in the cadmium-related industry, wherein the unit is gram/ton, and the cadmium content in the specific products or raw materials is set as a fixed value;
for cadmium-related enterprises with incomplete production elements, adopting the average capacity in many years in a specific time period, adopting the average cadmium discharge coefficient in many years of the subclasses of the industry calculated by the national material flow analysis and the quality balance to replace the cadmium discharge coefficient of each subclass of the cadmium-related industry in all years, and calculating the total cadmium discharge amount in the life cycle of a certain cadmium-related enterprise according to the following calculation formula:
Fi，i＝Qi，t×i，t
wherein:
the average cadmium discharge coefficient of the subclass i in the cadmium industry during delta t years is expressed in grams/ton-product;
the method is the average capacity of enterprises j under subclass i of cadmium related industry for many years, and the unit is ton; t isi，jThe storage duration time of an enterprise j under a subclass i related to the cadmium industry is expressed in a unit of year;
and finally, calculating in batches according to different situations to obtain the accumulated cadmium discharge amount of each cadmium-related enterprise and forming a complete cadmium-related enterprise directory.
2. The method for batch evaluation of cadmium emission intensity of cadmium-related enterprises in regional scope of claim 1, wherein the average cadmium content range in the cadmium-related industry subclasses and raw materials comprises the average cadmium content in the ore raw materials and concentrates or refined products, nickel-cadmium batteries, solar batteries, plastics, glass, limestone, cement, phosphate ores and phosphate fertilizers involved in the mining and selecting smelting of colored/black metal ores.
3. The method of claim 1, wherein the business duration is divided into a period of business duration that has been shut down or stopped and a period of business duration that is still in process.
4. The method for batch evaluation of cadmium-related enterprise cadmium emission intensity in an area according to claim 1, wherein the preliminarily obtained cadmium-related enterprise directory information is constructed according to the following steps:
firstly, determining the specific cadmium industry: for the cadmium-related industry, there are two main categories: one is related to the industry of cadmium raw materials, and the other is related to the industry of cadmium impurities;
secondly, on the basis of determining the specific cadmium-related industry, crawling various data information about cadmium-related enterprises, which are disclosed on the internet by national and local ecological environment protection-related functional departments, and performing formatting treatment;
thirdly, a national industry and commerce credit investigation system and a third-party data set are used as data sources for crawling cadmium-related enterprise information network big data, and a cadmium-related industry enterprise supplementary directory is obtained through crawling of the determined cadmium-related industry type and search keywords;
fourthly, further integrating the data extracted based on the network big data and the nationwide cadmium-related enterprise directory information with perfect data published by department, and cleaning the data of the integrated data set, including duplication removal, spatial position correction and elimination of distribution enterprises;
the data cleaning principle is as follows:
A. firstly, carrying out unsupervised cleaning: a data cleaning algorithm is predefined, the computer automatically executes the algorithm to clean the data set, and then a cleaning report is generated;
B. and then carrying out supervised cleaning: analyzing the collected data under the guidance of field experts, manually removing obvious noise data and repeatedly recording, and filling up the missing value data;
and fifthly, combining the address of the enterprise and the POI information of the network map to acquire the preliminary longitude and latitude information of the cadmium-related enterprise with the missing spatial position, converting a coordinate system according to the uniform spatial information mathematical basis of the project, and realizing standardization according to a uniform data structure, thereby forming a preliminary cadmium-related enterprise directory.
5. The method for batch evaluation of cadmium emission intensity of cadmium-related enterprises in an area scope of claim 4, wherein the cadmium-related raw material industry is a manufacturing enterprise using cadmium as one of raw materials.
6. The method for evaluating the cadmium-related enterprise cadmium emission intensity in batches within the regional scope according to claim 4, wherein the cadmium-related impurity industry is the cadmium-related industry in which cadmium appears as an impurity in a production process.
7. The method for batch evaluation of cadmium emission intensity of cadmium-related enterprises within the regional scope of claim 4, wherein the cadmium-related raw material industry comprises enterprises in the industries of nickel-cadmium battery or solar battery production, cadmium-containing pigment, plastic, glass, ceramic production, cadmium alloy manufacturing and cadmium plating.
8. The method for evaluating cadmium emission intensity of cadmium-related enterprises in batches within the regional scope of claim 4, wherein the cadmium-related impurity industry comprises nonferrous metal ore mining and smelting, steel ore dressing and smelting, cement and phosphate fertilizer production and manufacture.
9. The method for batch evaluation of cadmium emission intensity of cadmium-related enterprises in regional areas as claimed in claim 4, wherein the unsupervised cleaning comprises removing enterprises which are related to exclusion, non-inclusion, exclusion, removal, desulfurization, non-phosphorus and lead-free in business scope; and deleting the enterprises for sale, storage and transportation, wherein the enterprises comprise enterprise names and enterprises with marketing, purchase, easy and export in the operation range, and do not comprise enterprises for collecting, selecting, processing, producing, smelting and manufacturing characters.
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