Accounting method, device and equipment for production and pollution discharge coefficients of perfluorinated and polyfluoroalkyl substances in leather industry and storage medium

Abstract

The invention provides a leather industry perfluorinated and polyfluoroalkyl substance production and pollution discharge coefficient accounting method, device and equipment and a storage medium. Relates to the technical field of ecological environment pollution monitoring and management. The method comprises the steps of leather enterprise basic information collection, sample collection, sample pretreatment and detection, production and pollution discharge coefficient accounting and flux accounting. Wherein the input coefficients comprise a blue alum skin carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient and a spraying solution contribution coefficient; the process coefficients comprise a retanning process change coefficient, a dyeing process change coefficient, a drying process change coefficient and a spraying process change coefficient; the output coefficients comprise a wastewater residue coefficient, a leather adhesion coefficient, a leftover material carrying coefficient, a workshop air dissipation coefficient, a workshop air particulate matter fixation coefficient and a loss coefficient. According to the method, the blank of footprint data of perfluorinated and polyfluoroalkyl substances in the leather industry can be filled up, and a scientific basis is provided for formulating targeted environmental management and emission reduction measures.

Description

Technical Field

[0001] The present application relates to the technical field of ecological environmental pollution monitoring and management, and in particular to a method, device, equipment and storage medium for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry. Background Art

[0002] In recent years, environmental pollution issues are becoming a bottleneck restricting the development of the leather industry. The leather processing process requires the use of a large number of chemicals. Per- and polyfluoroalkyl substances (hereinafter referred to as PFAS) are widely used in the process of leather products due to their good hydrophobic and oleophobic properties. However, PFAS has also been proven to be persistent, bioaccumulative and toxic and has attracted great attention from the world. At present, the specific types and dosages of PFAS used in my country's leather industry and their migration and transformation patterns in various process links have not yet been clarified. The industry lacks a unified PFAS production and emission coefficient and environmental fate accounting method, and cannot comprehensively and systematically grasp the input path, process changes and output destination of PFAS in the leather making process, which seriously restricts the improvement of the industry's pollution control capabilities. Summary of the Invention

[0003] The present application provides a method, device, equipment and storage medium for calculating the production and emission coefficients of perfluorinated and polyfluorinated alkyl substances in the leather industry, so as to fill the gap in the data on the production and emission coefficients of PFAS in the leather industry.

[0004] In the first aspect, the present application provides a method for calculating the production and emission coefficients of perfluorinated and polyfluorinated alkyl substances in the leather industry, including:

[0005] Calculating input coefficients; wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spray solution contribution coefficient;

[0006] Calculating process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient;

[0007] Calculating output coefficients; wherein the output coefficients include wastewater residual coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient and loss coefficient;

[0008] The input coefficient, process coefficient and output coefficient are multiplied by the annual leather production of the leather factory to obtain the PFAS flux at each stage of the leather factory.

[0009] In one possible design, the input coefficients are calculated as follows:

[0010] The blue vitriol leather carrying coefficient is used to characterize the initial PFAS carrying mass per unit area of ​​leather, and is directly represented by the PFAS concentration attached to the initial blue vitriol leather;

[0011] The workshop water contribution coefficient is used to characterize the contribution of workshop water use to PFAS in tanned leather. The calculation formula is as follows:

[0012]

[0013] Where, It represents the workshop water contribution coefficient, which represents the amount of PFAS substances in the workshop water used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the water used in the factory, V WSW Represents the volume of workshop water used during dyeing, Represents the total area of ​​leather goods produced in the factory per year;

[0014] The contribution coefficient of the dyeing solution is calculated by the following formula:

[0015]

[0016] Where, It represents the contribution coefficient of dyeing solution, which represents the amount of PFAS substances in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the dyeing solution used by the factory, V DS represents the volume of staining solution used;

[0017] The spray solution contribution coefficient is calculated using the following formula:

[0018]

[0019] Where, It represents the contribution coefficient of the spray solution, which represents the amount of PFAS substances in the spray solution used per unit area of ​​leather goods in the spraying process of a factory. represents the concentration of PFAS in the spray solution used by the factory, V SS Represents the volume of spray solution used.

[0020] In one possible design, the process coefficient is calculated as follows:

[0021] The coefficient of variation of the retanning process is calculated using the following formula:

[0022]

[0023] Where, It represents the coefficient of variation of the retanning process, which represents the change of PFAS in leather products after the retanning process in a certain tannery. Represents the concentration of PFAS in retanned leathers from this tannery, represents the concentration of PFAS in blue vitriol hides from tanneries;

[0024] The coefficient of variation of the dyeing process was calculated using the following formula:

[0025]

[0026] Where, It represents the coefficient of variation of the dyeing process, which represents the change of PFAS in leather products after the dyeing process of a certain tannery. represents the concentration of PFAS in dyeing at this tannery;

[0027] The coefficient of variation of the drying process is calculated using the following formula:

[0028]

[0029] Where, It represents the coefficient of variation of the drying process, which represents the change of PFAS in leather products after the drying process in a certain tannery. Represents the concentration of PFAS in leather products after drying in the tannery, represents the concentration of PFAS in leather goods before drying at the tannery;

[0030] The coefficient of variation of the spraying process is calculated using the following formula:

[0031]

[0032] Where, It represents the coefficient of variation of the spraying process, representing the change of PFAS in leather products after the spraying process in a tannery. Represents the concentration of PFAS in leather products after spraying at the tannery. Represents the concentration of PFAS in leather goods before spraying at this tannery.

[0033] In one possible design, the workshop air dissipation coefficient includes the drying workshop air dissipation coefficient and the spraying workshop air dissipation coefficient, and the workshop air particle fixation coefficient includes the drying workshop air particle fixation coefficient and the spraying workshop air particle fixation coefficient. The output coefficient is calculated as follows:

[0034] The wastewater residual coefficient is calculated using the following formula:

[0035]

[0036] Where, It represents the wastewater residual coefficient, which represents the amount of PFAS substances in the wastewater generated by a factory when producing leather goods per unit area. represents the concentration of PFAS in wastewater produced by a factory, V WW,fty Represents the volume of wastewater generated by the plant;

[0037] The air dissipation coefficient of the drying workshop is calculated by the following formula:

[0038]

[0039] Where, It indicates the air dissipation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air when drying leather goods per unit area in a factory's drying workshop. Represents the total annual PFAS emissions from the drying workshop of the factory. Represents the total amount of concentration change when the leather dries, represents the PFAS concentration in the air of the drying workshop, d represents the distance between the sampling point and the leather, Represents the concentration change value when the leather is drying;

[0040] The air dissipation coefficient of the spraying workshop is calculated by the following formula:

[0041]

[0042] Where, It represents the air dissipation coefficient of the spray shop, which represents the mass of PFAS emitted into the air when spraying per unit area in a spray shop of a factory. is the total annual PFAS emission from the spray painting workshop of this factory. Represents the total concentration change when the leather is sprayed, Represents the PFAS concentration in the air of the spray workshop, Represents the concentration change value when spraying leather;

[0043] The air particle fixation coefficient of the drying workshop is calculated by the following formula:

[0044]

[0045] Where, It represents the air particle fixation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air particles when drying leather goods per unit area in a factory's drying workshop. is the total annual emission of air particulate matter from the drying workshop, represents the concentration of PFAS in the air particles in the drying workshop, and ρ represents the concentration of air particles;

[0046] The air particle fixation coefficient of the spraying workshop is as follows:

[0047]

[0048] Where, It represents the air particle fixation coefficient of the spray shop, which represents the mass of PFAS emitted into the air particles when spraying per unit area in a factory's spray shop. is the total annual emission of PFAS particulate matter from the spray painting workshop of this factory. represents the concentration of PFAS in air particulate matter in the spray workshop;

[0049] The leather adhesion coefficient and scrap carrying coefficient are calculated using the following formula:

[0050]

[0051] Where, It represents the leather adhesion coefficient, which represents the amount of PFAS carried by the leather per unit area after spraying in a certain factory. It represents the scrap carrying coefficient, which represents the amount of PFAS carried by scraps per unit area of ​​a factory. represents the PFAS concentration of scraps, R LS Represents the scrap rate that becomes scrap;

[0052] The loss coefficient is calculated using the following formula:

[0053]

[0054] Where, It represents the loss coefficient, which represents the loss of PFAS per unit area of ​​leather goods produced by a factory. Represents the total annual input of PFAS to the plant, Represents the total annual output of PFAS from the plant.

[0055] In one possible design, the method further includes:

[0056] The PFAS flux of leather in the target area is calculated using the following formula:

[0057]

[0058] Where, (Average coefficient) represents the average value of the coefficients of the same nature for all plants; Represents the coefficient value of a certain property of a certain factory; n represents the number of factories involved in the calculation.

[0059] In one possible design, before calculating the input coefficients, the method further includes:

[0060] Obtain basic information of leather enterprises, collect samples from the leather enterprises, perform pretreatment and PFAS targeted detection on the collected samples, and obtain basic detection data for calculating the leather production and emission coefficient; wherein the leather production and emission coefficient includes input coefficient, process coefficient and output coefficient.

[0061] In one possible design, the pretreatment of the collected samples includes separation, extraction, purification, and concentration.

[0062] In a second aspect, the present application provides a device for calculating the production and emission coefficients of perfluorinated and polyfluorinated alkyl substances in the leather industry, the device comprising:

[0063] A first coefficient calculation module is configured to calculate input coefficients; wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spray solution contribution coefficient;

[0064] A second coefficient calculation module is configured to calculate process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient;

[0065] A third coefficient calculation module is configured to calculate output coefficients; wherein the output coefficients include wastewater residual coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient and loss coefficient;

[0066] The PFAS flux calculation module is configured to multiply the input coefficient, process coefficient and output coefficient by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

[0067] In a third aspect, an embodiment of the present application provides an electronic device comprising: at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect.

[0068] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer execution instructions are stored. When a processor executes the computer execution instructions, the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect is implemented.

[0069] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect.

[0070] The method, device, equipment and storage medium for calculating the production and emission coefficient of perfluorinated and polyfluorinated alkyl substances in the leather industry provided in this application have at least the following beneficial effects:

[0071] This application achieves the quantitative tracking and distribution characteristic analysis of PFAS in the entire leather manufacturing process by establishing a PFAS input, process and output characteristic coefficient accounting system for the leather making process. By selecting typical PFAS compounds with a detection rate higher than 80%, and combining actual sampling monitoring data with environmental impact assessment, clean production and other report data provided by the enterprise, it is possible to scientifically estimate the migration and transformation behavior and destination characteristics of PFAS in each link. This accounting method has good adaptability and replicability, and can significantly improve the accuracy and systematicness of PFAS emission source analysis in the leather making industry, and provide reliable data support for the identification of pollution control points, optimization of alternative processes and PFAS emission reduction paths. Compared with the existing technology, this application has the advantages of comprehensive process coverage, multiple data sources and high accounting accuracy. It can effectively serve multiple scenarios such as PFAS environmental management, environmental footprint accounting and policy formulation in the leather industry, and has good promotion prospects and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0073] Figure 1 A flow chart of a method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry provided in an embodiment of the present application;

[0074] Figure 2 A schematic diagram of sample collection provided in an embodiment of the present application;

[0075] Figure 3 A flowchart of a specific implementation of a method for calculating the production and emission coefficient of perfluorinated and polyfluorinated alkyl substances in the leather industry provided in an embodiment of the present application;

[0076] Figure 4 This is a schematic diagram of the specific numerical relationship of the leather production and emission coefficient in Example 3 of this application, where the thickness of the line represents the PFAS flux;

[0077] Figure 5 This is a structural diagram of the device for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry provided in an embodiment of the present application.

[0078] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0079] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0080] In the technical solution of this application, the collection, storage, use, processing, transmission, provision and disclosure of information such as financial data or user data involved comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0081] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0082] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0083] Example 1:

[0084] The embodiment of the present application provides a method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry. Based on actual samples and test data, the method develops a series of characteristic coefficient calculation formulas for PFAS input, process and output for the leather making process. Among them, the input coefficient includes the blue vitriol leather carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient and the spraying solution contribution coefficient; the process coefficient includes the retanning process variation coefficient, the dyeing process variation coefficient, the drying process variation coefficient and the spraying process variation coefficient; the output coefficient includes the wastewater residual coefficient, the leather adhesion coefficient, the scrap carrying coefficient, the workshop air dissipation coefficient (including the drying workshop and the spraying workshop), the workshop air particulate fixation coefficient (including the drying workshop and the spraying workshop) and the loss coefficient. PFAS compounds with a detection rate of >80% are selected and substituted into the formula. In addition to the above-mentioned sampling and monitoring data, other necessary data are derived from documents such as the environmental impact assessment report and the clean production report provided by the enterprise.

[0085] In this embodiment, the method for obtaining actual samples and test data of a factory includes collecting basic information of the leather enterprise, sample collection, and sample preprocessing and testing.

[0086] When collecting basic information of leather enterprises, the collected information includes the enterprise's environmental impact assessment report, clean production report, production and discharge permit, factory floor plan, etc., in order to clarify the production and operation status of the leather enterprise.

[0087] During sample collection, each tannery was considered a separate factory system, with the physical boundaries of the factory serving as the system boundaries. The temporal boundaries of each factory system begin with tanning, progress through retanning, dyeing, drying, spraying, and finally finishing, ultimately producing finished products and wastewater. Material inputs and outputs exist at each stage, including leather products before and after a process, as well as the raw materials used. This leads to the introduction, increase, and depletion of PFAS, manifested in raw material substitution, leather product adhesion, wastewater residue, soil seepage, and air escape. Therefore, specific aspects of the leathermaking process are analyzed as subunits of the factory system.

[0088] The sample collection types used to calculate the leather production pollution coefficient are as follows: Figure 2 As shown, it specifically includes blue alum skin, re-tanned skin, dyeing solution, workshop water, dyed skin, skin before drying, skin after drying, gas phase of air in the drying workshop, particle phase of air in the drying workshop, spraying solution, skin before spraying, skin after spraying, gas phase of air in the spraying workshop, particle phase of air in the spraying workshop, wastewater and scraps.

[0089] During sample pretreatment and testing, pretreatment (including separation, extraction, purification, concentration and other steps) and PFAS targeted detection are carried out according to different sample types to obtain basic test data for calculating leather production and emission coefficients.

[0090] like Figure 1As shown, it is a flow chart of the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry provided in an embodiment of the present application. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry includes the following steps S10-S40.

[0091] S10: Calculate input coefficients; wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spray solution contribution coefficient.

[0092] In some embodiments, the specific method of calculating the input coefficient is:

[0093] Workshop water is one of the sources of PFAS in leather goods and is used extensively in the dyeing process. The workshop water contribution coefficient is defined to characterize the contribution of workshop water use to PFAS in tanned leather. The calculation formula is as follows:

[0094]

[0095] Where, (Workshop water contribution coefficient) represents the amount of PFAS substances in the workshop water used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the water used in the factory, V WSW Represents the volume of workshop water used during dyeing, Represents the total area of ​​leather goods produced by the factory annually.

[0096] Chemical use is a significant source of PFAS in leather goods. These chemicals are pre-formulated into dyeing solutions and spraying solutions, which are then applied to the dyeing and spraying processes, respectively. The dyeing solution contribution coefficient and the spraying solution contribution coefficient are defined to characterize the PFAS contribution of chemical use to the dyeing and spraying processes of leather goods. Since the dyeing and spraying solutions are prepared using workshop water, the PFAS contribution from workshop water must be excluded. The calculation formula is as follows:

[0097]

[0098] Where, (Dyeing solution contribution coefficient) represents the amount of PFAS substances in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the dyeing solution used by the factory, V DS Represents the volume of staining solution used.

[0099]

[0100] Where, (Spraying solution contribution coefficient) represents the amount of PFAS substances in the spraying solution used per unit area of ​​leather goods in the spraying process of a factory. represents the concentration of PFAS in the spray solution used by the factory, V SS Represents the volume of spray solution used.

[0101] In addition, blue alum leather is used as the initial input leather for tanning leather, and the blue alum leather carrying coefficient is defined to characterize the initial PFAS carrying mass per unit area of ​​leather, which is directly represented by the PFAS concentration attached to the initial blue alum leather.

[0102] S20: Calculating process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient.

[0103] In some embodiments, the specific method of calculating the process coefficient is:

[0104] The blue alum leather entering the factory undergoes four main processes: retanning, dyeing, drying, and spraying. The PFAS content in leather products may increase or decrease before and after each process, resulting in four corresponding process coefficients. These coefficients are defined as the difference between the compound concentration after a certain process and the compound concentration when the leather product enters the process. The formula is as follows:

[0105]

[0106] Where, (Retanning process variation coefficient) represents the change of PFAS in leather products after retanning process in a certain tannery. Represents the concentration of PFAS in retanned leathers from this tannery, Represents the concentration of PFAS in blue vitriol hides from the tannery.

[0107]

[0108] Where, (Dyeing process variation coefficient) represents the change of PFAS in leather products after the dyeing process of a tannery. Represents the concentration of PFAS in dyes from this tannery.

[0109]

[0110] Where, (Drying process variation coefficient) represents the change of PFAS in leather products after the drying process in a tannery. Represents the concentration of PFAS in leather products after drying in the tannery, Represents the concentration of PFAS in leather products before drying in the tannery.

[0111]

[0112] Where, (Coefficient of variation of spraying process) represents the change of PFAS in leather products after spraying process in a certain tannery. Represents the concentration of PFAS in leather products after spraying at the tannery. Represents the concentration of PFAS in leather goods before spraying at this tannery.

[0113] S30: Calculate the output coefficient; wherein the output coefficient includes the wastewater residual coefficient, the leather adhesion coefficient, the scrap carrying coefficient, the workshop air dissipation coefficient, the workshop air particulate matter fixation coefficient and the loss coefficient.

[0114] In some embodiments, the specific method of calculating the output coefficient is:

[0115] Unused PFAS in the solution remains in the solution and becomes wastewater. The wastewater residual coefficient is defined to characterize the PFAS content in the wastewater generated per unit area of ​​leather processing. The calculation formula is as follows:

[0116]

[0117] Where, (Wastewater Residual Coefficient) represents the amount of PFAS substances in wastewater generated by a factory when producing leather goods per unit area. represents the concentration of PFAS in wastewater produced by a factory, V WW,fty Represents the volume of wastewater generated by the plant.

[0118] Due to the process characteristics of heating and evaporation in the drying workshop and atomization and dissipation of spray solutions in the spraying workshop, the leather-making process is the main source of PFAS in the air. The workshop air dissipation coefficient is defined to characterize the contribution of drying or spraying leather products per unit area to PFAS in the air. Based on the actual layout characteristics of the drying workshop and spraying workshop, they are treated as semi-enclosed ventilated spaces. When the air is flowing, the air between the leather and the air sampler is considered to be in equilibrium with no concentration gradient. The following formula is used for calculation:

[0119]

[0120]

[0121] Where, (Air dissipation coefficient in drying workshop) represents the mass of PFAS emitted into the air when drying leather goods per unit area in a factory’s drying workshop. Represents the total annual PFAS emissions from the drying workshop of the factory. Represents the total amount of concentration change when the leather dries, represents the PFAS concentration in the air of the drying workshop, d represents the distance between the sampling point and the leather, Represents the change in concentration of leather as it dries.

[0122]

[0123] Where, (Spray Shop Air Emission Coefficient) represents the mass of PFAS emitted into the air when spraying per unit area in a factory's spray shop. is the total annual PFAS emission from the spray painting workshop of this factory. Represents the total concentration change when the leather is sprayed, Represents the PFAS concentration in the air of the spray workshop, Represents the concentration change value when spraying leather.

[0124] PFAS released into the air through heating, evaporation, and atomization are further attached to airborne particles. The workshop air particle fixation coefficient is defined to characterize the contribution of drying or spraying leather products per unit area to PFAS in airborne particles.

[0125]

[0126] Where, (Air particle fixation coefficient in drying workshop) represents the mass of PFAS emitted into air particles when drying leather goods per unit area in a factory’s drying workshop. is the total annual emission of air particulate matter from the drying workshop, represents the concentration of PFAS in the air particulate matter in the drying workshop, and ρ represents the concentration of particulate matter in the air.

[0127]

[0128] Where, (Spraying workshop air particle fixation coefficient) represents the mass of PFAS emitted into air particles when spraying per unit area in a factory's spraying workshop. is the total annual emission of PFAS particulate matter from the spray painting workshop of this factory. Represents the PFAS concentration in the air particulate matter of the spray workshop.

[0129] The PFAS that are ultimately effectively utilized adhere to leather products. The leather adhesion coefficient is defined to represent the amount of PFAS adhered per unit area of ​​leather products after the process is completed. After finishing, some leather products are cut off and become scraps. The scrap carryover coefficient is defined to represent the amount of PFAS adhered per unit area of ​​leather products after these scraps are removed.

[0130]

[0131] Where, (Leather Adhesion Coefficient) represents the amount of PFAS carried by leather per unit area after spraying in a factory. (Scraps Carrying Factor) represents the amount of PFAS carried by scraps per unit area of ​​a factory. represents the PFAS concentration of scraps, R LS It represents the scrap rate that becomes scrap, and the empirical value is 1%.

[0132] There is always a balance between PFAS input and PFAS output. However, some PFAS output is lost. Because losses cannot be directly quantified, losses are defined as the difference between PFAS input and output.

[0133]

[0134] Where, (Loss coefficient) represents the loss of PFAS per unit area of ​​leather goods produced by a factory. Represents the total annual input of PFAS to the plant, Represents the total annual output of PFAS from the plant.

[0135] S40: Multiply the input coefficient, process coefficient and output coefficient by the annual leather production of the leather factory to obtain the PFAS flux at each stage of the leather factory.

[0136] In this embodiment, the coefficients obtained based on the above steps S10-S30 are the changes in the PFAS selected for a certain link in a specific factory. The PFAS flux at each stage of the factory can be obtained by multiplying the above coefficients by the annual leather production of the leather factory.

[0137] In some embodiments, if leather data is available from multiple sources, the arithmetic mean and standard deviation of the same properties can be calculated to obtain average coefficients. Because the average coefficients are more representative, they can be used to calculate the PFAS flux of leather in a particular region.

[0138]

[0139] Where, (Average coefficient) represents the average value of the coefficients of the same nature of all factories, and its specific expression is determined by each coefficient; Represents the coefficient value of a certain property of a certain factory; n represents the number of factories involved in the calculation.

[0140] Example 2:

[0141] The embodiment of the present invention provides a method for calculating the production and emission coefficient of perfluoroalkyl and polyfluoroalkyl substances in the leather industry, such as Figure 3 As shown, the calculation method includes the following steps:

[0142] Step 1: Collect basic information of Tannery A.

[0143] Tannery A is used as the research object in Example 1. The collected information includes Tannery A's environmental impact assessment report, clean production report, pollution production and discharge permit, factory floor plan, etc., in order to clarify the production and operation status of the leather enterprise.

[0144] Step 2: Sample collection.

[0145] Relevant samples were collected from Tannery A, including blue alum leather, re-tanned leather, dyeing solution, workshop water, dyed leather, leather before drying, leather after drying, gas phase of air in the drying workshop, particle phase of air in the drying workshop, spraying solution, leather before spraying, leather after spraying, gas phase of air in the spraying workshop, particle phase of air in the spraying workshop, wastewater and scraps.

[0146] Step 3: Sample pretreatment and detection.

[0147] Pretreatment (including separation, extraction, purification, and concentration) and targeted PFAS detection are performed based on different sample types to obtain basic test data for calculating leather production and emission coefficients. The PFAS types tested include PFBS, PFPeS, PFHxS, PFHpS, PFOS, and PFNS.

[0148] Step 4: Calculate the pollution production and emission coefficient.

[0149] Based on actual samples and testing data, characteristic coefficients for PFAS inputs, processes, and outputs were calculated for the tanning process. The six compounds, PFBS, PFPeS, PFHxS, PFHpS, PFOS, and PFNS, all had detection rates >80% and could be incorporated into the calculation formula. In addition to the aforementioned sampling and monitoring data, other necessary data were obtained from Tannery A's environmental impact assessment report, clean production report, and other documents.

[0150] The specific pollution production and emission coefficients calculated are shown in Table 1 below.

[0151] Table 1 Pollution production and emission coefficients

[0152]

[0153]

[0154] Example 3:

[0155] The embodiment of the present invention provides a method for calculating the production and emission coefficient of perfluoroalkyl and polyfluoroalkyl substances in the leather industry, such as Figure 3 As shown, the calculation method includes the following steps:

[0156] Step 1: Collect basic information of tanneries in the tannery park.

[0157] In Example 2, a typical tannery park was used as the research object. This park includes eight tanneries: Tannery A, Tannery B, Tannery C, Tannery D, Tannery E, Tannery F, Tannery G, and Tannery S. Information collected included environmental impact assessment reports, clean production reports, production and discharge permits, and factory floor plans for Tannery A, Tannery B, Tannery C, and Tannery D to clarify the production and operation status of these eight leather enterprises.

[0158] Step 2: Sample collection.

[0159] Relevant samples were collected from Tannery A, Tannery B, Tannery C, Tannery D, Tannery E, Tannery F, Tannery G and Tannery S, including blue alum hides, re-tanned hides, dyeing solution, workshop water, dyed hides, hides before drying, hides after drying, gas phase of air in drying workshop, particle phase of air in drying workshop, spraying solution, hides before spraying, hides after spraying, gas phase of air in spraying workshop, particle phase of air in spraying workshop, wastewater and scraps.

[0160] Step 3: Sample pretreatment and detection.

[0161] Pretreatment (including separation, extraction, purification, and concentration) and targeted PFAS detection are performed based on different sample types to obtain basic test data for calculating leather production and emission coefficients. The PFAS types tested include PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA.

[0162] Step 4: Calculate the pollution production and emission coefficient.

[0163] Based on actual samples and testing data, characteristic coefficients for PFAS inputs, processes, and outputs were calculated for the leather production process. PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA all had detection rates >80%, allowing them to be incorporated into the calculation formula. In addition to the aforementioned sampling and monitoring data, other necessary data were obtained from environmental impact assessment reports, clean production reports, and other documents from eight tanneries.

[0164] After calculating the leather production and emission coefficients of Tannery A, Tannery B, Tannery C, Tannery D, Tannery E, Tannery F, Tannery G and Tannery S respectively, calculate the arithmetic mean of the coefficients of the same nature and obtain the average coefficient of each coefficient, which is the production and emission coefficient of the tannery park.

[0165] The specific pollution production and emission coefficients calculated are shown in Table 2 and Figure 4 shown.

[0166] Table 2 Specific pollution production and emission coefficients

[0167]

[0168]

[0169] As shown in Table 2 and Figure 4 As shown in Figure 2, the total input coefficient of seven compounds, PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA, is 179149.3 ng / m 2 In 2024, the total leather production of the eight tanneries in the tannery park is 20 million square meters. Therefore, the total input of the seven compounds PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA and PFDA in the tannery park in 2024 is 179149.3 ng / m 2 ×20000000 square meters=3582986000000ng=3.58kg.

[0170] Example 4:

[0171] The present application also provides a device for calculating the emission coefficient of perfluoroalkyl and polyfluoroalkyl substances in the leather industry, such as Figure 5 As shown, the calculation device for the production and emission coefficient of perfluorinated and polyfluorinated alkyl substances in the leather industry includes:

[0172] The first coefficient calculation module 501 is configured to calculate input coefficients, wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spraying solution contribution coefficient;

[0173] The second coefficient calculation module 502 is configured to calculate process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient;

[0174] The third coefficient calculation module 503 is configured to calculate output coefficients; wherein the output coefficients include wastewater residual coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient and loss coefficient;

[0175] The PFAS flux calculation module 504 is configured to multiply the input coefficient, process coefficient and output coefficient by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

[0176] In some embodiments, the first coefficient calculation module is further configured to calculate the input coefficients in the following manner:

[0177] The blue vitriol leather carrying coefficient is used to characterize the initial PFAS carrying mass per unit area of ​​leather, and is directly represented by the PFAS concentration attached to the initial blue vitriol leather;

[0178] The workshop water contribution coefficient is used to characterize the contribution of workshop water use to PFAS in tanned leather. The calculation formula is as follows:

[0179]

[0180] Where, It represents the workshop water contribution coefficient, which represents the amount of PFAS substances in the workshop water used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the water used in the factory, V WSW Represents the volume of workshop water used during dyeing, Represents the total area of ​​leather goods produced in the factory per year;

[0181] The contribution coefficient of the dyeing solution is calculated by the following formula:

[0182]

[0183] Where, It represents the contribution coefficient of dyeing solution, which represents the amount of PFAS substances in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the dyeing solution used by the factory, V DS represents the volume of staining solution used;

[0184] The spray solution contribution coefficient is calculated using the following formula:

[0185]

[0186] Where, It represents the contribution coefficient of the spray solution, which represents the amount of PFAS substances in the spray solution used per unit area of ​​leather goods in the spraying process of a factory. represents the concentration of PFAS in the spray solution used by the factory, V SS Represents the volume of spray solution used.

[0187] In some embodiments, the second coefficient calculation module is further configured to calculate the process coefficient by:

[0188] The coefficient of variation of the retanning process is calculated using the following formula:

[0189]

[0190] Where, It represents the coefficient of variation of the retanning process, which represents the change of PFAS in leather products after the retanning process in a certain tannery. Represents the concentration of PFAS in retanned leathers from this tannery, represents the concentration of PFAS in blue vitriol hides from tanneries;

[0191] The coefficient of variation of the dyeing process was calculated using the following formula:

[0192]

[0193] Where, It represents the coefficient of variation of the dyeing process, which represents the change of PFAS in leather products after the dyeing process of a certain tannery. represents the concentration of PFAS in dyeing at this tannery;

[0194] The coefficient of variation of the drying process is calculated using the following formula:

[0195]

[0196] Where, It represents the coefficient of variation of the drying process, which represents the change of PFAS in leather products after the drying process in a certain tannery. Represents the concentration of PFAS in leather products after drying in the tannery, represents the concentration of PFAS in leather goods before drying at the tannery;

[0197] The coefficient of variation of the spraying process is calculated using the following formula:

[0198]

[0199] Where, It represents the coefficient of variation of the spraying process, representing the change of PFAS in leather products after the spraying process in a tannery. Represents the concentration of PFAS in leather products after spraying at the tannery. Represents the concentration of PFAS in leather goods before spraying at this tannery.

[0200] In some embodiments, the workshop air dissipation coefficient includes the drying workshop air dissipation coefficient and the spraying workshop air dissipation coefficient, the workshop air particle fixation coefficient includes the drying workshop air particle fixation coefficient and the spraying workshop air particle fixation coefficient, and the third coefficient calculation module is further configured to calculate the output coefficient in the following manner:

[0201] The wastewater residual coefficient is calculated using the following formula:

[0202]

[0203] Where, It represents the wastewater residual coefficient, which represents the amount of PFAS substances in the wastewater generated by a factory when producing leather goods per unit area. represents the concentration of PFAS in wastewater produced by a factory, V WW,fty Represents the volume of wastewater generated by the plant;

[0204] The air dissipation coefficient of the drying workshop is calculated by the following formula:

[0205]

[0206] Where, It indicates the air dissipation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air when drying leather goods per unit area in a factory's drying workshop. Represents the total annual PFAS emissions from the drying workshop of the factory. Represents the total amount of concentration change when the leather dries, represents the PFAS concentration in the air of the drying workshop, d represents the distance between the sampling point and the leather, Represents the concentration change value when the leather is drying;

[0207] The air dissipation coefficient of the spraying workshop is calculated by the following formula:

[0208]

[0209] Where, It represents the air dissipation coefficient of the spray shop, which represents the mass of PFAS emitted into the air when spraying per unit area in a spray shop of a factory. is the total annual PFAS emission from the spray painting workshop of this factory. Represents the total concentration change when the leather is sprayed, Represents the PFAS concentration in the air of the spray workshop, Represents the concentration change value when spraying leather;

[0210] The air particle fixation coefficient of the drying workshop is calculated by the following formula:

[0211]

[0212] Where, It represents the air particle fixation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air particles when drying leather goods per unit area in a factory's drying workshop. is the total annual emission of air particulate matter from the drying workshop, represents the concentration of PFAS in the air particles in the drying workshop, and ρ represents the concentration of air particles;

[0213] The air particle fixation coefficient of the spraying workshop is as follows:

[0214]

[0215] Where, It represents the air particle fixation coefficient of the spray shop, which represents the mass of PFAS emitted into the air particles when spraying per unit area in a factory's spray shop. is the total annual emission of PFAS particulate matter from the spray painting workshop of this factory. represents the concentration of PFAS in air particulate matter in the spray workshop;

[0216] The leather adhesion coefficient and scrap carrying coefficient are calculated using the following formula:

[0217]

[0218] Where, It represents the leather adhesion coefficient, which represents the amount of PFAS carried by the leather per unit area after spraying in a certain factory. It represents the scrap carrying coefficient, which represents the amount of PFAS carried by scraps per unit area of ​​a factory. represents the PFAS concentration of scraps, R LS Represents the scrap rate that becomes scrap;

[0219] The loss coefficient is calculated using the following formula:

[0220]

[0221]

[0222] Where, It represents the loss coefficient, which represents the loss of PFAS per unit area of ​​leather goods produced by a factory. Represents the total annual input of PFAS to the plant, Represents the total annual output of PFAS from the plant.

[0223] In some embodiments, the PFAS flux calculation module is further configured to:

[0224] The PFAS flux of leather in the target area is calculated using the following formula:

[0225]

[0226] Where, (Average coefficient) represents the average value of the coefficients of the same nature for all plants; Represents the coefficient value of a certain property of a certain factory; n represents the number of factories involved in the calculation.

[0227] An embodiment of the present application provides an electronic device, which may include a processor and a memory, wherein the processor and the memory can communicate with each other; illustratively, the processor and the memory communicate with each other via a communication bus.

[0228] The processor executes the computer-executable instructions stored in the memory, so that the processor implements the solution in the above embodiment. The processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0229] The communication bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. System buses can be categorized as address buses, data buses, and control buses. Transceivers enable communication between database access devices and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) or non-volatile memory.

[0230] The electronic device provided in the embodiment of the present application may be the terminal device of the above embodiment.

[0231] An embodiment of the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are run on a computer, the computer executes the technical solution of the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry in the above embodiment.

[0232] An embodiment of the present application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. At least one processor can read the computer program from the computer-readable storage medium. When at least one processor executes the computer program, it can implement the technical solution of the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry in the above embodiment.

[0233] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division. In actual implementation, there may be other division methods, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or module, which can be electrical, mechanical or other forms.

[0234] Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, that is, they may be located in one place or distributed across multiple network elements. Some or all of these modules may be selected to implement the solution of this embodiment based on actual needs.

[0235] In addition, the functional modules in the various embodiments of the present application may be integrated into a single processing unit, or each module may exist physically separately, or two or more modules may be integrated into a single unit. The above-mentioned modules may be implemented in the form of hardware or hardware plus software functional units.

[0236] The above-mentioned integrated module implemented in the form of a software functional module can be stored in a computer-readable storage medium. The above-mentioned software functional module is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to perform some steps of the methods of various embodiments of the present application.

[0237] It should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), or application-specific integrated circuits (ASICs). A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly implemented by a hardware processor or implemented by a combination of hardware and software modules in the processor.

[0238] The memory may include a high-speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a magnetic disk or an optical disk.

[0239] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be divided into address buses, data buses, and control buses.

[0240] The storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0241] An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the storage medium can also exist as discrete components in an electronic control unit or a main control device.

[0242] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calculating the emission coefficient of perfluoroalkyl and polyfluoroalkyl substances in the leather industry, characterized in that: The method comprises: Calculating input coefficients; wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spray solution contribution coefficient; Calculating process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient; Calculating output coefficients; wherein the output coefficients include wastewater residual coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient and loss coefficient; The input coefficient, process coefficient and output coefficient are multiplied by the annual leather production of the leather factory to obtain the PFAS flux at each stage of the leather factory.

2. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that: The input coefficients are calculated as follows: The blue vitriol leather carrying coefficient is used to characterize the initial PFAS carrying mass per unit area of ​​leather, and is directly represented by the PFAS concentration attached to the initial blue vitriol leather; The workshop water contribution coefficient is used to characterize the contribution of workshop water use to PFAS in tanned leather. The calculation formula is as follows: Where, It represents the workshop water contribution coefficient, which represents the amount of PFAS substances in the workshop water used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the water used in the factory, V WSW Represents the volume of workshop water used during dyeing, Represents the total area of ​​leather goods produced in the factory per year; The contribution coefficient of the dyeing solution is calculated by the following formula: Where, It represents the contribution coefficient of dyeing solution, which represents the amount of PFAS substances in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. represents the concentration of PFAS in the dyeing solution used by the factory, V DS represents the volume of staining solution used; The spray solution contribution coefficient is calculated using the following formula: Where, It represents the contribution coefficient of the spray solution, which represents the amount of PFAS substances in the spray solution used per unit area of ​​leather goods in the spraying process of a factory. represents the concentration of PFAS in the spray solution used by the factory, V SS Represents the volume of spray solution used.

3. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that: The process coefficient is calculated as follows: The coefficient of variation of the retanning process is calculated using the following formula: Where, It represents the coefficient of variation of the retanning process, which represents the change of PFAS in leather products after the retanning process in a certain tannery. Represents the concentration of PFAS in retanned leathers from this tannery, represents the concentration of PFAS in blue vitriol hides from tanneries; The coefficient of variation of the dyeing process was calculated using the following formula: Where, It represents the coefficient of variation of the dyeing process, which represents the change of PFAS in leather products after the dyeing process of a certain tannery. represents the concentration of PFAS in dyeing at this tannery; The coefficient of variation of the drying process is calculated using the following formula: Where, It represents the coefficient of variation of the drying process, which represents the change of PFAS in leather products after the drying process in a certain tannery. Represents the concentration of PFAS in leather products after drying in the tannery, represents the concentration of PFAS in leather goods before drying at the tannery; The coefficient of variation of the spraying process is calculated using the following formula: Where, It represents the coefficient of variation of the spraying process, representing the change of PFAS in leather products after the spraying process in a tannery. Represents the concentration of PFAS in leather products after spraying at the tannery. Represents the concentration of PFAS in leather goods before spraying at this tannery.

4. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that: The workshop air dissipation coefficient includes the drying workshop air dissipation coefficient and the spraying workshop air dissipation coefficient. The workshop air particle fixation coefficient includes the drying workshop air particle fixation coefficient and the spraying workshop air particle fixation coefficient. The output coefficient is calculated as follows: The wastewater residual coefficient is calculated using the following formula: Where, It represents the wastewater residual coefficient, which represents the amount of PFAS substances in the wastewater generated when a factory produces leather goods per unit area. represents the concentration of PFAS in wastewater produced by a factory, V WW,fty Represents the volume of wastewater generated by the plant; The air dissipation coefficient of the drying workshop is calculated by the following formula: Where, It indicates the air dissipation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air when drying leather goods per unit area in a factory's drying workshop. Represents the total annual PFAS emissions from the drying workshop of the factory. Represents the total amount of concentration change when the leather dries, represents the concentration of PFAS in the air of the drying workshop, d represents the distance between the sampling point and the leather, Represents the concentration change value when the leather is drying; The air dissipation coefficient of the spraying workshop is calculated by the following formula: Where, It represents the air dissipation coefficient of the spray shop, which represents the mass of PFAS emitted into the air when spraying per unit area in a spray shop of a factory. is the total annual PFAS emission from the spray painting workshop of this factory. Represents the total concentration change when the leather is sprayed, Represents the PFAS concentration in the air of the spray workshop, Represents the concentration change value when spraying leather; The air particle fixation coefficient of the drying workshop is calculated by the following formula: Where, It represents the air particle fixation coefficient of the drying workshop, which represents the mass of PFAS emitted into the air particles when drying leather goods per unit area in a factory's drying workshop. is the total annual emission of air particulate matter from the drying workshop, represents the concentration of PFAS in the air particles in the drying workshop, and ρ represents the concentration of air particles; The air particle fixation coefficient of the spraying workshop is as follows: Where, It represents the air particle fixation coefficient of the spray shop, which represents the mass of PFAS emitted into the air particles when spraying per unit area in a factory's spray shop. is the total annual emission of PFAS particulate matter from the spray painting workshop of this factory. represents the concentration of PFAS in air particulate matter in the spray workshop; The leather adhesion coefficient and scrap carrying coefficient are calculated using the following formula: Where, It represents the leather adhesion coefficient, which represents the amount of PFAS carried by the leather per unit area after spraying in a certain factory. It represents the scrap carrying coefficient, which represents the amount of PFAS carried by scraps per unit area of ​​a factory. represents the PFAS concentration of scraps, R LS Represents the scrap rate that becomes scrap; The loss coefficient is calculated using the following formula: Where, It represents the loss coefficient, which represents the loss of PFAS per unit area of ​​leather goods produced by a factory. Represents the total annual input of PFAS to the plant, Represents the total annual output of PFAS from the plant.

5. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that: The method further comprises: The PFAS flux of leather in the target area is calculated using the following formula: Where, (Average coefficient) represents the average value of the coefficients of the same nature for all plants; Represents the coefficient value of a certain property of a certain factory; n represents the number of factories involved in the calculation.

6. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that: Before calculating the input coefficients, the method further includes: Obtain basic information of leather enterprises, collect samples from the leather enterprises, perform pretreatment and PFAS targeted detection on the collected samples, and obtain basic detection data for calculating the leather production and emission coefficient; wherein the leather production and emission coefficient includes input coefficient, process coefficient and output coefficient.

7. The method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to claim 6, characterized in that: The pretreatment methods for collected samples include separation, extraction, purification and concentration.

8. A device for calculating the emission coefficient of perfluoroalkyl and polyfluoroalkyl substances in the leather industry, characterized in that: The device comprises: A first coefficient calculation module is configured to calculate input coefficients; wherein the input coefficients include a blue vitriol carrying coefficient, a workshop water contribution coefficient, a dyeing solution contribution coefficient, and a spray solution contribution coefficient; A second coefficient calculation module is configured to calculate process coefficients; wherein the process coefficients include a retanning process variation coefficient, a dyeing process variation coefficient, a drying process variation coefficient, and a spraying process variation coefficient; A third coefficient calculation module is configured to calculate output coefficients; wherein the output coefficients include wastewater residual coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient and loss coefficient; The PFAS flux calculation module is configured to multiply the input coefficient, process coefficient and output coefficient by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

9. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method for calculating the production and emission coefficients of perfluoroalkyl and polyfluoroalkyl substances in the leather industry according to any one of claims 1 to 5.

Images