Method, device and equipment for calculating total fluorine and polyfluoroalkyl substance emission and discharge coefficients in leather industry and storage medium

Abstract

The application provides a method, device and equipment for calculating the production and emission pollution coefficient of perfluoro and polyfluoro alkyl substances in the leather industry, and a storage medium. It relates to the technical field of ecological environment pollution monitoring and management. The method comprises collecting basic information of leather enterprises, sample collection, sample pretreatment and detection, production and emission pollution coefficient calculation and flux calculation. The input coefficient includes the blue alum skin 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 change coefficient, the dyeing process change coefficient, the drying process change coefficient and the spraying process change coefficient; the output coefficient includes the wastewater residue coefficient, the leather adhesion coefficient, the edge waste carrying coefficient, the workshop air dispersion coefficient, the workshop air particulate matter fixation coefficient and the loss coefficient. The application can fill the gap of footprint data of perfluoro and polyfluoro alkyl substances in the leather industry, and provide a scientific basis for formulating targeted environmental management and emission reduction measures.

Description

Technical Field

[0001] This application relates to the field of ecological and environmental pollution monitoring and management technology, and in particular to a method, apparatus, equipment and storage medium for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry. Background Technology

[0002] In recent years, environmental pollution has become a bottleneck restricting the development of the leather industry. Leather processing requires the use of large quantities of chemicals, and perfluorinated and polyfluoroalkyl substances (PFAS) are widely used in the processing of leather products due to their excellent hydrophobic and oleophobic properties. However, PFAS have also been proven to be persistent, bioaccumulative, and toxic, drawing significant global attention. Currently, the specific types and dosages of PFAS used in my country's leather industry, as well as their migration and transformation patterns in various process stages, are not clearly defined. The industry lacks a unified method for calculating PFAS emission coefficients and environmental fate, making it impossible to comprehensively and systematically grasp the input pathways, process changes, and output destinations of PFAS in the leather-making process, severely restricting the improvement of the industry's pollution control capabilities. Summary of the Invention

[0003] This application provides a method, apparatus, equipment, and storage medium for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances (PFAS) in the leather industry, thereby filling the gap in PFAS emission coefficient data in the leather industry.

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

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

[0006] Calculate process coefficients; wherein, the process coefficients include the variation coefficients for retanning, dyeing, drying, and spraying processes;

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

[0008] The PFAS flux at each stage of the leather factory is obtained by multiplying the input coefficient, process coefficient, and output coefficient by the annual leather production 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 the PFAS of tanning leather, and the calculation formula is as follows:

[0012]

[0013] In the formula, The workshop water contribution coefficient represents the amount of PFAS substances used in the workshop water per unit area of ​​leather goods during the dyeing process in a factory. This represents the concentration of PFAS in the workshop water used by the factory. This represents the volume of workshop water used during dyeing. This represents the total area of ​​leather goods produced by the factory annually;

[0014] The contribution coefficient of the staining solution is calculated using the following formula:

[0015]

[0016] In the formula, The contribution coefficient of the dyeing solution represents the amount of PFAS in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. This represents the concentration of PFAS in the staining solution used by the factory. This represents the volume of staining solution used;

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

[0018]

[0019] In the formula, The contribution coefficient of the spraying solution represents the amount of PFAS in the spraying solution used per unit area of ​​leather parts in a factory's spraying process. This represents the concentration of PFAS in the spraying solution used by the factory. This represents the volume of the spray solution used.

[0020] In one possible design, the process coefficients are calculated as follows:

[0021] The change coefficient during the retanning process is calculated using the following formula:

[0022]

[0023] In the formula, This represents the variation coefficient during the retanning process, indicating the change in PFAS in leather goods after retanning at a tannery. This represents the concentration of PFAS in the retanned leather of this tannery. This represents the concentration of PFAS in the blue vitriol hide from the tanneries.

[0024] The coefficient of variation during the staining process is calculated using the following formula:

[0025]

[0026] In the formula, This represents the variation coefficient during the dyeing process, indicating the change in PFAS in leather goods after dyeing at a tannery. This represents the concentration of PFAS used in the dyeing process at the tanneries.

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

[0028]

[0029] In the formula, This represents the variation coefficient during the drying process, indicating the change in PFAS in leather goods after the drying process at a tannery. This represents the concentration of PFAS in the leather goods after drying at the tanneries. This represents the concentration of PFAS in the leather goods before drying at the tanneries.

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

[0031]

[0032] In the formula, This represents the variation coefficient during the spraying process, indicating the change in PFAS in leather products from a tannery after the spraying process. This represents the concentration of PFAS in the leather goods after spraying at the tanneries. This represents the concentration of PFAS in the leather goods before the tanneries applied the coating.

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

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

[0035]

[0036] In the formula, The wastewater residue coefficient represents the amount of PFAS in the wastewater generated when a factory produces leather goods per unit area. This represents the concentration of PFAS in the wastewater produced by a certain factory. This represents the volume of wastewater generated by the factory;

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

[0038]

[0039]

[0040] In the formula, The air emission coefficient represents the mass of PFAS emitted into the air when drying a unit area of ​​leather goods in a factory's drying workshop. This represents the total annual PFAS emissions from the drying workshop of the factory. This represents the total change in concentration during leather drying. The value represents the PFAS concentration in the air of the drying workshop, and d represents the distance of the sampling point from the leather. This represents the concentration change value during leather drying;

[0041] The air dissipation coefficient in the spray painting workshop is calculated using the following formula:

[0042]

[0043]

[0044] In the formula, The air dissipation coefficient represents the mass of PFAS emitted into the air per unit area painted in a factory's painting workshop. This refers to the total annual PFAS emissions from the factory's painting workshop. This represents the total change in concentration during leather spraying. This represents the PFAS concentration in the air of the painting workshop. This represents the concentration change value during leather spraying;

[0045] The air particle adhesion coefficient in the drying workshop is calculated using the following formula:

[0046]

[0047]

[0048] In the formula, This represents the particulate matter fixation coefficient in the air of a drying workshop, indicating the mass of PFAS emitted into the air as particulate matter when drying a unit area of ​​leather goods in a factory's drying workshop. This is the total annual air particulate matter emissions from the drying workshop. This represents the PFAS concentration in the air of the drying workshop. This represents the concentration of particulate matter in the air.

[0049] The air particle adhesion coefficient in the spraying workshop is calculated using the following formula:

[0050]

[0051]

[0052] In the formula, This represents the airborne particulate solidification coefficient in a painting workshop, indicating the mass of PFAS emitted into the airborne particulate matter when a unit area is painted in a factory's painting workshop. This refers to the total annual PFAS emissions of particulate matter from the factory's painting workshop. This represents the PFAS concentration in the air of the painting workshop;

[0053] The leather adhesion coefficient and the scrap carry-over coefficient are calculated using the following formulas:

[0054]

[0055]

[0056] In the formula, The coefficient of adhesion represents the amount of PFAS carried by leather per unit area after spraying in a certain factory. This represents the PFAS carryover factor, indicating the amount of PFAS carried per unit area of ​​scrap material in a factory. The PFAS concentration representing scrap material This represents the scrap rate that results in waste material being used as scrap.

[0057] The loss coefficient is calculated using the following formula:

[0058]

[0059]

[0060]

[0061] In the formula, This represents the loss coefficient, indicating the amount of PFAS loss per unit area produced by a factory. This represents the total annual PFAS input of the plant. This represents the factory's total annual PFAS output.

[0062] In one possible design, the method further includes:

[0063] The PFAS flux of the leather in the target area is calculated using the following formula:

[0064]

[0065] In the formula, (Average coefficient) represents the average value of coefficients with the same properties across all factories; This represents a coefficient value for a certain property of a certain factory; n The representative is involved in calculating the number of factories.

[0066] In one possible design, the method further includes, before calculating the input coefficients:

[0067] Basic information of leather enterprises is obtained, and samples are collected from the leather enterprises. The collected samples are pre-processed and subjected to PFAS targeted detection to obtain basic detection data for calculating the leather production pollution coefficient. The leather production pollution coefficient includes input coefficient, process coefficient and output coefficient.

[0068] In one possible design, the pretreatment of the collected samples includes separation, extraction, purification, and concentration.

[0069] Secondly, this application provides a device for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, the device comprising:

[0070] The first coefficient calculation module is configured to calculate input coefficients; wherein, the input coefficients include the blue vitriol carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient, and the spraying solution contribution coefficient;

[0071] The second coefficient calculation module is configured to calculate process coefficients; wherein, the process coefficients include the retanning process variation coefficient, the dyeing process variation coefficient, the drying process variation coefficient, and the spraying process variation coefficient;

[0072] The third coefficient calculation module is configured to calculate output coefficients; wherein, the output coefficients include wastewater residue coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient, and loss coefficient;

[0073] The PFAS flux calculation module is configured to multiply the input coefficients, process coefficients, and output coefficients by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

[0074] Thirdly, embodiments of this application provide an electronic device, including: at least one processor and a memory; the memory stores computer execution instructions; the at least one processor executes the computer execution instructions stored in the memory, causing the at least one processor to execute the calculation method for the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect.

[0075] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions. When a processor executes the computer-executable instructions, it implements the method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect.

[0076] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry as described in the first aspect and various possible designs of the first aspect.

[0077] The method, apparatus, equipment, and storage medium for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry provided in this application have at least the following beneficial effects:

[0078] This application establishes a PFAS input, process, and output characteristic coefficient calculation system for the leather tanning process, enabling quantitative tracking and distribution characteristic analysis of PFAS throughout the entire leather manufacturing process. By selecting typical PFAS compounds with a detection rate higher than 80%, and combining actual sampling and monitoring data with environmental impact assessments and cleaner production reports provided by enterprises, the migration and transformation behavior and fate characteristics of PFAS in each stage can be scientifically estimated. This calculation method has good adaptability and replicability, significantly improving the accuracy and systematicness of PFAS emission source apportionment in the leather tanning industry, and providing reliable data support for pollution control point identification, alternative process optimization, and PFAS emission reduction pathways. Compared with existing technologies, this application has the advantages of comprehensive process coverage, diverse data sources, and high calculation accuracy, and can effectively serve multiple application scenarios such as PFAS environmental management, environmental footprint accounting, and policy formulation in the leather industry, showing good prospects for promotion and environmental benefits. Attached Figure Description

[0079] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0080] Figure 1 A flowchart illustrating a method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, provided for embodiments of this application;

[0081] Figure 2 This is a schematic diagram of the sample collection provided in an embodiment of this application;

[0082] Figure 3 A flowchart illustrating the specific implementation of a method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, as provided in this application embodiment;

[0083] Figure 4 This is a schematic diagram showing the specific numerical relationship of the pollution discharge coefficient of leather production in Embodiment 3 of this application. The thickness of the lines represents the PFAS flux.

[0084] Figure 5 A structural diagram of the apparatus for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, provided in an embodiment of this application.

[0085] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0086] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0087] The collection, storage, use, processing, transmission, provision, and disclosure of financial data or user data involved in the technical solution of this application all comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0088] It should be noted that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, it does not mean that the applicant has used or necessarily used the solution.

[0089] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0090] Example 1:

[0091] This application provides a method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances (PFAS) in the leather industry. Based on actual samples and testing data, this method develops a series of characteristic coefficient calculation formulas for PFAS inputs, processes, and outputs in the leather tanning process. Input coefficients include the blue vitriol leather carrying coefficient, workshop water contribution coefficient, dyeing solution contribution coefficient, and spraying solution contribution coefficient; process coefficients include the retanning process variation coefficient, dyeing process variation coefficient, drying process variation coefficient, and spraying process variation coefficient; output coefficients include the wastewater residue coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient (including drying and spraying workshops), workshop air particulate matter fixation coefficient (including drying and spraying workshops), and loss coefficient. PFAS compounds with a detection rate >80% are selected and substituted into the formulas. In addition to the above sampling and monitoring data, other necessary data are obtained from environmental impact assessment reports, cleaner production reports, and other documents provided by the enterprise.

[0092] In this embodiment, the method for obtaining actual samples and test data from a factory includes collecting basic information about leather enterprises, sample collection, and sample preprocessing and testing.

[0093] When collecting basic information about leather companies, the information collected includes the company's environmental impact assessment report, clean production report, production and pollution discharge permit, factory layout plan, etc., in order to clarify the production and operation status of the leather companies.

[0094] During sample collection, each tannery was treated as a separate factory system, with the physical boundaries of the factory area serving as the system boundaries. The time boundary of each factory system spanned from tanning, through retanning, dyeing, drying, spraying, and finally finishing, resulting in the production of finished products and wastewater. Material inputs and outputs existed at each stage, including leather goods before and after a particular process, as well as the raw materials used. This led to the introduction, increase, and decrease of PFAS (Potentially Permeable Acids), manifested in raw material input, leather adhesion, wastewater residue, soil seepage, and air dissipation. Therefore, the analysis focused on specific stages of the tanning process as sub-units of the factory system.

[0095] Sample collection types used for calculating the pollution coefficient of leather production, such as... Figure 2 As shown, it specifically includes blue vitriol leather, retanned leather, dyeing solution, workshop water, dyed leather, leather before drying, leather after drying, air phase of drying workshop, air particulate phase of drying workshop, spraying solution, leather before spraying, leather after spraying, air phase of spraying workshop, air particulate phase of spraying workshop, wastewater and scraps.

[0096] During sample pretreatment and testing, pretreatment (including separation, extraction, purification, concentration, etc.) and PFAS targeted detection are carried out according to different sample types to obtain basic test data for calculating the pollution discharge coefficient of leather production.

[0097] like Figure 1The flowchart shown is a method for calculating the emission coefficient of perfluorinated and polyfluoroalkyl substances in the leather industry according to an embodiment of this application. The method for calculating the emission coefficient of perfluorinated and polyfluoroalkyl substances in the leather industry includes the following steps S10-S40.

[0098] S10: Calculate the input coefficients; wherein the input coefficients include the blue vitriol carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient, and the spraying solution contribution coefficient.

[0099] In some embodiments, the input coefficients are calculated in the following manner:

[0100] Workshop water is one of the sources of PFAS in leather goods and is used extensively in the dyeing process. A workshop water contribution coefficient is defined to characterize the contribution of workshop water use to the PFAS of tanned leather; the calculation formula is as follows:

[0101]

[0102] In the formula, (Workshop water contribution coefficient) represents the amount of PFAS substance used in the workshop water per unit area of ​​leather goods during the dyeing process in a factory. This represents the concentration of PFAS in the workshop water used by the factory. This represents the volume of workshop water used during dyeing. This represents the total area of ​​leather goods produced by the factory annually.

[0103] Chemical use is a significant source of PFAS in leather goods. Chemicals are pre-formulated into dyeing solutions and spraying solutions, which are then applied to the dyeing and spraying processes, respectively. Contribution coefficients for the dyeing solution and spraying solution are defined to characterize the contribution of chemical use to the PFAS in 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 formulas are as follows:

[0104]

[0105] In the formula, (Contribution coefficient of dyeing solution) represents the amount of PFAS in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. This represents the concentration of PFAS in the staining solution used by the factory. This represents the volume of the staining solution used.

[0106]

[0107] In the formula, (Contribution coefficient of spraying solution) represents the amount of PFAS substance in the spraying solution used per unit area of ​​leather parts in the spraying process of a factory. This represents the concentration of PFAS in the spraying solution used by the factory. This represents the volume of the spray solution used.

[0108] In addition, as the initial input leather for tanning, blue vitriol leather is defined as the blue vitriol leather carrying coefficient 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 vitriol leather.

[0109] S20: Calculate process coefficients; wherein, the process coefficients include the variation coefficients of the retanning process, the dyeing process, the drying process, and the spraying process.

[0110] In some embodiments, the specific method for calculating process coefficients is as follows:

[0111] The blue vitriol leather entering the factory undergoes four main processes: retanning, dyeing, drying, and spraying. The concentration of PFAS (phosphorus sulfate-containing compounds) in the leather can increase or decrease before and after each process, resulting in four process coefficients. These coefficients are defined as the difference between the compound concentration of the leather after a certain process and the compound concentration when the leather enters that process, as shown in the following formula:

[0112]

[0113] In the formula, This represents the changes in PFAS in leather goods after retanning at a tannery. This represents the concentration of PFAS in the retanned leather of this tannery. This represents the concentration of PFAS in the blue vitriol hide from the tanneries.

[0114]

[0115] In the formula, This represents the changes in PFAS in leather goods from a tannery after the dyeing process. This represents the concentration of PFAS used in the dyeing process at the tanneries.

[0116]

[0117] In the formula, This represents the changes in PFAS in leather goods after the drying process at a tannery. This represents the concentration of PFAS in the leather goods after drying at the tanneries. This represents the concentration of PFAS in the leather goods before drying at the tannery.

[0118]

[0119] In the formula, ( This represents the change in PFAS in leather goods after a tannery's spray coating process. This represents the concentration of PFAS in the leather goods after spraying at the tanneries. This represents the concentration of PFAS in the leather goods before the tanneries applied the coating.

[0120] S30: Calculate the output coefficients; wherein the output coefficients include wastewater residue coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient, and loss coefficient.

[0121] In some embodiments, the output coefficients are calculated in the following manner:

[0122] Unused PFAS in the solution remain in the solution and become wastewater. A wastewater residue coefficient is defined to characterize the PFAS content in the wastewater generated per unit area of ​​leather processing. The calculation formula is as follows:

[0123]

[0124] In the formula, (Wastewater Residue Coefficient) represents the amount of PFAS in the wastewater generated by a factory when producing leather goods per unit area. This represents the concentration of PFAS in the wastewater produced by a certain factory. This represents the volume of wastewater generated by the factory.

[0125] Due to the characteristics of the drying workshop's heating and evaporation processes and the spraying workshop's atomization and dispersion of the spraying solution, these are the main sources of PFAS (phosphorus efflux) in the air from the leather processing. An air dissipation coefficient is defined to characterize the contribution of drying or spraying of leather per unit area to PFAS in the air. Based on the actual layout characteristics of the drying and spraying workshops, they are treated as semi-enclosed ventilation spaces. Under airflow conditions, the air between the leather and the air sampler is considered to be in equilibrium with no concentration gradient. Therefore, the coefficient is calculated using the following formula:

[0126]

[0127]

[0128] In the formula, The (air emission coefficient) represents the mass of PFAS emitted into the air when drying a unit area of ​​leather goods in a factory's drying workshop. This represents the total annual PFAS emissions from the drying workshop of the factory. This represents the total change in concentration during leather drying. The value represents the PFAS concentration in the air of the drying workshop, and d represents the distance of the sampling point from the leather. This represents the concentration change value during leather drying.

[0129]

[0130]

[0131] In the formula, The (air dissipation coefficient of a painting workshop) represents the mass of PFAS emitted into the air when a unit area is painted in a painting workshop of a factory. This refers to the total annual PFAS emissions from the factory's painting workshop. This represents the total change in concentration during leather spraying. This represents the PFAS concentration in the air of the painting workshop. This represents the concentration change value during leather spraying.

[0132] PFAS released into the air through heating, evaporation, and atomization are further adsorbed onto airborne particles. A workshop airborne particle fixation coefficient is defined to characterize the contribution of drying or spraying of leather parts per unit area to PFAS in airborne particles.

[0133]

[0134]

[0135] In the formula, (Airborne Particulate Fixation Coefficient) represents the mass of PFAS emitted into the air as particulate matter when drying a unit area of ​​leather goods in a factory's drying workshop. This is the total annual air particulate matter emissions from the drying workshop. This represents the PFAS concentration in the air of the drying workshop. This represents the concentration of particulate matter in the air.

[0136]

[0137]

[0138] In the formula, (Airborne particulate solidification coefficient in a painting workshop) represents the mass of PFAS emitted into the airborne particulate matter when a unit area is painted in a painting workshop of a factory. This refers to the total annual PFAS emissions of particulate matter from the factory's painting workshop. This represents the concentration of PFAS in the airborne particulate matter of the painting workshop.

[0139] Ultimately, the PFAS effectively utilized is attached to the leather goods. A leather adhesion coefficient is defined to characterize the amount of PFAS attached to a unit area of ​​leather goods after the finishing process. After finishing, a portion of the leather goods is cut off and becomes scrap. A scrap carry-over coefficient is defined to characterize the amount of PFAS attached to a unit area of ​​leather goods after they become scrap.

[0140]

[0141]

[0142] In the formula, (Leather adhesion coefficient) represents the amount of PFAS carried by a unit area of ​​leather after spraying in a certain factory. (Scrap Material Carryover Factor) represents the amount of PFAS carried by scrap material per unit area in a factory. The PFAS concentration representing scrap material This represents the scrap rate that becomes offcuts, taken as an empirical value of 1%.

[0143] The input and output of a PFAS system are always in balance. However, a portion of the PFAS output is represented as a loss. Since the loss cannot be directly quantified, it is defined as the difference between the PFAS input and output.

[0144]

[0145]

[0146]

[0147] In the formula, The (loss coefficient) represents the amount of PFAS loss when a factory produces leather goods per unit area. This represents the total annual PFAS input of the plant. This represents the factory's total annual PFAS output.

[0148] S40: 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.

[0149] In this embodiment, the coefficients obtained in steps S10-S30 are the changes in PFAS selected for a specific stage of a factory. By multiplying the coefficients by the annual leather production of the leather factory, the PFAS flux of each stage of the factory can be obtained.

[0150] In some embodiments, if leather information data from multiple sources are available, the arithmetic mean and its standard deviation of similar properties can be calculated to obtain the average coefficients. Because the average coefficients are more universally representative, they can be used to calculate the PFAS flux of leather in a particular region.

[0151]

[0152] In the formula, (Average coefficient) represents the average value of coefficients of the same nature for all factories, and its specific expression is determined by each coefficient; This represents a coefficient value for a certain property of a certain factory; n The representative is involved in calculating the number of factories.

[0153] Example 2:

[0154] This invention provides a method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, such as... Figure 3 As shown, this accounting method includes the following steps:

[0155] Step 1: Collect basic information about Tannery A.

[0156] Tannery A was used as the subject of this study. Information collected included Tannery A's environmental impact assessment report, clean production report, production and discharge permits, and factory layout plan, in order to clarify the production and operation status of the leather enterprise.

[0157] Step 2, Sample collection.

[0158] Collect relevant samples from Tannery A, including blue vitriol leather, retanned leather, dyeing solution, workshop water, dyed leather, leather before drying, leather after drying, air phase of drying workshop, air particulate phase of drying workshop, spraying solution, leather before spraying, leather after spraying, air phase of spraying workshop, air particulate phase of spraying workshop, wastewater, and scraps.

[0159] Step 3: Sample pretreatment and testing.

[0160] Pretreatment (including separation, extraction, purification, and concentration) and PFAS targeted detection were performed on different sample types to obtain basic detection data for calculating the pollution coefficient of leather production. The detected PFAS types included six compounds: PFBS, PFPeS, PFHxS, PFHpS, PFOS, and PFNS.

[0161] Step 4: Calculation of production and pollution discharge coefficients.

[0162] Based on actual samples and test data, characteristic coefficients for PFAS inputs, processes, and outputs in the leather tanning process were calculated. The detection rates of six compounds—PFBS, PFPeS, PFHxS, PFHpS, PFOS, and PFNS—were all >80%, and they can be substituted into the calculation formula. In addition to the sampling and monitoring data mentioned above, other necessary data were obtained from documents such as the environmental impact assessment report and clean production report of Tannery A.

[0163] The specific production and pollution discharge coefficients are shown in Table 1 below.

[0164] Table 1 Production and Emission Coefficients

[0165]

[0166] Example 3:

[0167] This invention provides a method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, such as... Figure 3 As shown, this accounting method includes the following steps:

[0168] Step 1: Collect basic information about tanneries within the tannery park.

[0169] This study uses a typical tannery industrial park as the subject of Example 2. The park comprises eight tanneries: Tannery A, Tannery B, Tannery C, Tannery D, Tannery E, Tannery F, Tannery G, and Tannery H. Information collected included the environmental impact assessment reports, clean production reports, production and discharge permits, and factory site plans of Tannery A, B, C, and D, to clarify the production and operation status of these eight leather enterprises.

[0170] Step 2, Sample collection.

[0171] Relevant samples were collected from Tannery A, Tannery B, Tannery C, Tannery D, Tannery E, Tannery F, Tannery G, and Tannery H. These samples included blue vitriol leather, retanned leather, dyeing solution, workshop water, dyed leather, leather before drying, leather after drying, air vapor phase in the drying workshop, air particulate phase in the drying workshop, spraying solution, leather before spraying, leather after spraying, air vapor phase in the spraying workshop, air particulate phase in the spraying workshop, wastewater, and scrap materials.

[0172] Step 3: Sample pretreatment and testing.

[0173] Pretreatment (including separation, extraction, purification, and concentration) and PFAS targeted detection were performed on different sample types to obtain basic detection data for calculating the pollution coefficient of leather production. The detected PFAS types included seven compounds: PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA.

[0174] Step 4: Calculation of production and pollution discharge coefficients.

[0175] Based on actual samples and testing data, characteristic coefficients for PFAS inputs, processes, and outputs in the leather tanning process were calculated. The detection rates of seven compounds—PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA—were all >80%, and these can be substituted into the calculation formula. In addition to the aforementioned sampling and monitoring data, other necessary data were obtained from environmental impact assessment reports, cleaner production reports, and other documents from eight tanneries.

[0176] After calculating the leather production and pollution discharge coefficients of tanneries A, B, C, D, E, F, G, and H respectively, the arithmetic mean of coefficients of the same nature is calculated to obtain the average coefficient of each coefficient, which is the production and pollution discharge coefficient of the tannery park.

[0177] The specific production and pollution discharge coefficients calculated are shown in Table 2 and Figure 4 As shown.

[0178] Table 2 Specific Production and Discharge Coefficients

[0179]

[0180] As shown in Table 2 and Figure 4 As shown, the sum of the input coefficients for the seven compounds PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA is 179149.3 ng / m 2 In 2024, the total output of the eight tanneries in the tanning park was 20 million square meters. Therefore, the total input of seven compounds—PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFNA, and PFDA—in the tanning park in 2024 was 179,149.3 ng / m³. 2 20,000,000 square meters = 3,582,986,000,000 ng = 3.58 kg.

[0181] Example 4:

[0182] This application also provides a device for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, such as... Figure 5 As shown, the apparatus for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry includes:

[0183] The first coefficient calculation module 501 is configured to calculate input coefficients; wherein, the input coefficients include the blue vitriol carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient, and the spraying solution contribution coefficient;

[0184] The second coefficient calculation module 502 is configured to calculate process coefficients; wherein, the process coefficients include the retanning process variation coefficient, the dyeing process variation coefficient, the drying process variation coefficient, and the spraying process variation coefficient;

[0185] The third coefficient calculation module 503 is configured to calculate output coefficients; wherein, the output coefficients include wastewater residue coefficient, leather adhesion coefficient, scrap material carrying coefficient, workshop air dissipation coefficient, workshop air particulate matter fixation coefficient, and loss coefficient;

[0186] The PFAS flux calculation module 504 is configured to multiply the input coefficients, process coefficients and output coefficients by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

[0187] In some embodiments, the first coefficient calculation module is further configured to calculate the input coefficients in the following manner:

[0188] 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.

[0189] The workshop water contribution coefficient is used to characterize the contribution of workshop water use to the PFAS of tanning leather, and the calculation formula is as follows:

[0190]

[0191] In the formula, The workshop water contribution coefficient represents the amount of PFAS substances used in the workshop water per unit area of ​​leather goods during the dyeing process in a factory. This represents the concentration of PFAS in the workshop water used by the factory. This represents the volume of workshop water used during dyeing. This represents the total area of ​​leather goods produced by the factory annually;

[0192] The contribution coefficient of the staining solution is calculated using the following formula:

[0193]

[0194] In the formula, The contribution coefficient of the dyeing solution represents the amount of PFAS in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. This represents the concentration of PFAS in the staining solution used by the factory. This represents the volume of staining solution used;

[0195] The contribution coefficient of the spraying solution is calculated using the following formula:

[0196]

[0197] In the formula, The contribution coefficient of the spraying solution represents the amount of PFAS in the spraying solution used per unit area of ​​leather parts in a factory's spraying process. This represents the concentration of PFAS in the spraying solution used by the factory. This represents the volume of the spray solution used.

[0198] In some embodiments, the second coefficient calculation module is further configured to calculate process coefficients in the following manner:

[0199] The change coefficient during the retanning process is calculated using the following formula:

[0200]

[0201] In the formula, This represents the variation coefficient during the retanning process, indicating the change in PFAS in leather goods after retanning at a tannery. This represents the concentration of PFAS in the retanned leather of this tannery. This represents the concentration of PFAS in the blue vitriol hide from the tanneries.

[0202] The coefficient of variation during the staining process is calculated using the following formula:

[0203]

[0204] In the formula, This represents the variation coefficient during the dyeing process, indicating the change in PFAS in leather goods after dyeing at a tannery. This represents the concentration of PFAS used in the dyeing process at the tanneries.

[0205] The coefficient of variation during the drying process is calculated using the following formula:

[0206]

[0207] In the formula, This represents the variation coefficient during the drying process, indicating the change in PFAS in leather goods after the drying process at a tannery. This represents the concentration of PFAS in the leather goods after drying at the tanneries. This represents the concentration of PFAS in the leather goods before drying at the tanneries.

[0208] The variation coefficient of the spraying process is calculated using the following formula:

[0209]

[0210] In the formula, This represents the variation coefficient during the spraying process, indicating the change in PFAS in leather products from a tannery after the spraying process. This represents the concentration of PFAS in the leather goods after spraying at the tanneries. This represents the concentration of PFAS in the leather goods before the tanneries applied the coating.

[0211] In some embodiments, the workshop air dissipation coefficient includes the air dissipation coefficient of the drying workshop and the air dissipation coefficient of the spraying workshop, and the workshop air particulate matter fixation coefficient includes the air particulate matter fixation coefficient of the drying workshop and the air particulate matter fixation coefficient of the spraying workshop. The third coefficient calculation module is further configured to calculate the output coefficient in the following manner:

[0212] The wastewater residual coefficient is calculated using the following formula:

[0213]

[0214] In the formula, The wastewater residue coefficient represents the amount of PFAS in the wastewater generated when a factory produces leather goods per unit area. This represents the concentration of PFAS in the wastewater produced by a certain factory. This represents the volume of wastewater generated by the factory;

[0215] The air dissipation coefficient of the drying workshop is calculated using the following formula:

[0216]

[0217]

[0218] In the formula, The air emission coefficient represents the mass of PFAS emitted into the air when drying a unit area of ​​leather goods in a factory's drying workshop. This represents the total annual PFAS emissions from the drying workshop of the factory. This represents the total change in concentration during leather drying. The value represents the PFAS concentration in the air of the drying workshop, and d represents the distance of the sampling point from the leather. This represents the concentration change value during leather drying;

[0219] The air dissipation coefficient in the spray painting workshop is calculated using the following formula:

[0220]

[0221]

[0222] In the formula, The air dissipation coefficient represents the mass of PFAS emitted into the air per unit area painted in a factory's painting workshop. This refers to the total annual PFAS emissions from the factory's painting workshop. This represents the total change in concentration during leather spraying. This represents the PFAS concentration in the air of the painting workshop. This represents the concentration change value during leather spraying;

[0223] The air particle adhesion coefficient in the drying workshop is calculated using the following formula:

[0224]

[0225]

[0226] In the formula, This represents the particulate matter fixation coefficient in the air of a drying workshop, indicating the mass of PFAS emitted into the air as particulate matter when drying a unit area of ​​leather goods in a factory's drying workshop. This is the total annual air particulate matter emissions from the drying workshop. This represents the PFAS concentration in the air of the drying workshop. This represents the concentration of particulate matter in the air.

[0227] The air particle adhesion coefficient in the spraying workshop is calculated using the following formula:

[0228]

[0229]

[0230] In the formula, This represents the airborne particulate solidification coefficient in a painting workshop, indicating the mass of PFAS emitted into the airborne particulate matter when a unit area is painted in a factory's painting workshop. This refers to the total annual PFAS emissions of particulate matter from the factory's painting workshop. This represents the PFAS concentration in the air of the painting workshop;

[0231] The leather adhesion coefficient and the scrap carry-over coefficient are calculated using the following formulas:

[0232]

[0233]

[0234] In the formula, The coefficient of adhesion represents the amount of PFAS carried by leather per unit area after spraying in a certain factory. This represents the PFAS carryover factor, indicating the amount of PFAS carried per unit area of ​​scrap material in a factory. The PFAS concentration representing scrap material This represents the scrap rate that results in waste material being used as scrap.

[0235] The loss coefficient is calculated using the following formula:

[0236]

[0237]

[0238]

[0239] In the formula, This represents the loss coefficient, indicating the amount of PFAS loss per unit area produced by a factory. This represents the total annual PFAS input of the plant. This represents the factory's total annual PFAS output.

[0240] In some embodiments, the PFAS flux calculation module is further configured to:

[0241] The PFAS flux of the leather in the target area is calculated using the following formula:

[0242]

[0243] In the formula, (Average coefficient) represents the average value of coefficients with the same properties across all factories; This represents a coefficient value for a certain property of a certain factory; n The representative is involved in calculating the number of factories.

[0244] This application provides an electronic device. The electronic device may include a processor and a memory, wherein the processor and the memory can communicate; exemplarily, the processor and the memory communicate via a communication bus.

[0245] The processor executes computer execution instructions stored in memory, causing the processor to perform the scheme in the above embodiments. 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.

[0246] The communication bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. Transceivers are used to 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) and may also include non-volatile memory.

[0247] The electronic device provided in this application embodiment can be the terminal device described in the above embodiments.

[0248] This application also provides a computer-readable storage medium storing computer instructions. When the computer instructions are executed on a computer, the computer performs the technical solution of the above-described method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry.

[0249] This 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 the at least one processor executes the computer program, it can implement the technical solution of the method for calculating the emission coefficient of perfluorinated and polyfluoroalkyl substances in the leather industry described in the above embodiments.

[0250] 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 instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0251] The modules described as separate components may or may not be physically separate. The 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 units. Some or all of the modules can be selected to implement the solution of this embodiment according to actual needs.

[0252] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one unit. The unit composed of the above modules can be implemented in hardware or in the form of hardware plus software functional units.

[0253] The integrated modules described above, implemented as software functional modules, can be stored in a computer-readable storage medium. These software functional modules, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods of the various embodiments of this application.

[0254] It should be understood that the aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor.

[0255] The memory may include high-speed RAM, and may also include non-volatile storage (NVM), such as at least one disk storage device, and may also be a USB flash drive, external hard drive, read-only memory, disk or optical disc, etc.

[0256] Buses can be Industry Standard Architecture (ISA) buses, Peripheral Component Interconnect (PCI) buses, or Extended Industry Standard Architecture (EISA) buses, etc. Buses can be categorized into address buses, data buses, control buses, etc.

[0257] The aforementioned storage medium can be implemented by any type of volatile or non-volatile storage 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 can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0258] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Alternatively, the storage medium can be an integral part of the processor. The processor and storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and storage medium can exist as discrete components in an electronic control unit or main control device.

[0259] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to 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; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, characterized in that, The method includes: Calculate the input coefficients; wherein the input coefficients include the blue vitriol carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient, and the spraying solution contribution coefficient; Calculate process coefficients; wherein, the process coefficients include the variation coefficients for retanning, dyeing, drying, and spraying processes; Calculate the output coefficients; wherein, the output coefficients include wastewater residue 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. 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 the PFAS of tanning leather, and the calculation formula is as follows: In the formula, The workshop water contribution coefficient represents the amount of PFAS substances used in the workshop water per unit area of ​​leather goods during the dyeing process in a factory. This represents the concentration of PFAS in the workshop water used by the factory. This represents the volume of workshop water used during dyeing. This represents the total area of ​​leather goods produced by the factory annually; The contribution coefficient of the staining solution is calculated using the following formula: In the formula, The contribution coefficient of the dyeing solution represents the amount of PFAS in the dyeing solution used per unit area of ​​leather goods in the dyeing process of a factory. This represents the concentration of PFAS in the dyeing solution used by the factory. This represents the volume of staining solution used; The contribution coefficient of the spraying solution is calculated using the following formula: In the formula, The contribution coefficient of the spraying solution represents the amount of PFAS in the spraying solution used per unit area of ​​leather parts in a factory's spraying process. This represents the concentration of PFAS in the spraying solution used by the factory. This represents the volume of spray solution used; The process coefficients are calculated as follows: The change coefficient during the retanning process is calculated using the following formula: In the formula, This represents the variation coefficient during the retanning process, indicating the change in PFAS in leather goods after retanning at a tannery. This represents the concentration of PFAS in the retanned leather of this tannery. This represents the concentration of PFAS in the blue vitriol hide from the tanneries. The coefficient of variation during the staining process is calculated using the following formula: In the formula, This represents the variation coefficient during the dyeing process, indicating the change in PFAS in leather goods after dyeing at a tannery. This represents the concentration of PFAS used in the dyeing process at the tanneries. The coefficient of variation during the drying process is calculated using the following formula: In the formula, This represents the variation coefficient during the drying process, indicating the change in PFAS in leather goods after the drying process at a tannery. This represents the concentration of PFAS in the leather goods after drying at the tanneries. This represents the concentration of PFAS in the leather goods before drying at the tanneries. The variation coefficient of the spraying process is calculated using the following formula: In the formula, This represents the variation coefficient during the spraying process, indicating the change in PFAS in leather products from a tannery after the spraying process. This represents the concentration of PFAS in the leather goods after spraying at the tanneries. This represents the concentration of PFAS in the leather goods before coating at the tanneries. The workshop air dissipation coefficient includes the air dissipation coefficient of the drying workshop and the air dissipation coefficient of the spraying workshop. The workshop air particulate matter fixation coefficient includes the air particulate matter fixation coefficient of the drying workshop and the air particulate matter fixation coefficient of the spraying workshop. The output coefficients are calculated in the following manner: The wastewater residual coefficient is calculated using the following formula: In the formula, The wastewater residue coefficient represents the amount of PFAS in the wastewater generated when a factory produces leather goods per unit area. This represents the concentration of PFAS in the wastewater produced by a certain factory. This represents the volume of wastewater generated by the factory; The air dissipation coefficient of the drying workshop is calculated using the following formula: In the formula, The air emission coefficient represents the mass of PFAS emitted into the air when drying a unit area of ​​leather goods in a factory's drying workshop. This represents the total annual PFAS emissions from the drying workshop of the factory. This represents the total change in concentration during leather drying. The value represents the PFAS concentration in the air of the drying workshop, and d represents the distance of the sampling point from the leather. This represents the concentration change value during leather drying; The air dissipation coefficient in the spray painting workshop is calculated using the following formula: In the formula, The air dissipation coefficient represents the mass of PFAS emitted into the air per unit area painted in a factory's painting workshop. This refers to the total annual PFAS emissions from the factory's painting workshop. This represents the total change in concentration during leather spraying. This represents the PFAS concentration in the air of the painting workshop. This represents the concentration change value during leather spraying; The air particle adhesion coefficient in the drying workshop is calculated using the following formula: In the formula, This represents the particulate matter fixation coefficient in the air of a drying workshop, indicating the mass of PFAS emitted into the air as particulate matter when drying a unit area of ​​leather goods in a factory's drying workshop. This is the total annual air particulate matter emissions from the drying workshop. This represents the PFAS concentration in the air of the drying workshop. This represents the concentration of particulate matter in the air. The air particle adhesion coefficient in the spraying workshop is calculated using the following formula: In the formula, This represents the airborne particulate solidification coefficient in a painting workshop, indicating the mass of PFAS emitted into the airborne particulate matter when a unit area is painted in a factory's painting workshop. This refers to the total annual PFAS emissions of particulate matter from the factory's painting workshop. This represents the PFAS concentration in the air of the painting workshop; The leather adhesion coefficient and the scrap carry-over coefficient are calculated using the following formulas: In the formula, This represents the leather adhesion coefficient, indicating the amount of PFAS carried by leather per unit area after spraying in a certain factory. This represents the PFAS carryover factor, indicating the amount of PFAS carried per unit area of ​​scrap material in a factory. The PFAS concentration representing scrap material This represents the scrap rate that results in waste material being used as scrap. The loss coefficient is calculated using the following formula: In the formula, This represents the loss coefficient, indicating the amount of PFAS loss per unit area produced by a factory. This represents the total annual PFAS input of the plant. This represents the factory's total annual PFAS output.

2. The method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that, The method further includes: The PFAS flux of the leather in the target area is calculated using the following formula: In the formula, This is the average coefficient, representing the average value of coefficients with the same properties across all factories; This represents a coefficient value for a certain property of a certain factory; n The representative is involved in calculating the number of factories.

3. The method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry according to claim 1, characterized in that, Before calculating the input coefficients, the method further includes: Basic information of leather enterprises is obtained, and samples are collected from the leather enterprises. The collected samples are pre-processed and subjected to PFAS targeted detection to obtain basic detection data for calculating the leather production pollution coefficient. The leather production pollution coefficient includes input coefficient, process coefficient and output coefficient.

4. The method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry according to claim 3, characterized in that, Methods for pre-processing collected samples include separation, extraction, purification, and concentration.

5. A device for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry, used to implement the method as described in any one of claims 1 to 4, characterized in that, The device includes: The first coefficient calculation module is configured to calculate input coefficients; wherein, the input coefficients include the blue vitriol carrying coefficient, the workshop water contribution coefficient, the dyeing solution contribution coefficient, and the spraying solution contribution coefficient; The second coefficient calculation module is configured to calculate process coefficients; wherein, the process coefficients include the retanning process variation coefficient, the dyeing process variation coefficient, the drying process variation coefficient, and the spraying process variation coefficient; The third coefficient calculation module is configured to calculate output coefficients; wherein, the output coefficients include wastewater residue 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 coefficients, process coefficients, and output coefficients by the annual leather production of the leather factory to obtain the PFAS flux of each stage of the leather factory.

6. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method for calculating the emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry as described in any one of claims 1-4.

7. 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 emission coefficients of perfluorinated and polyfluoroalkyl substances in the leather industry as described in any one of claims 1-4.

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