Industrial park pollutant allowable emission amount verification and dynamic allocation method

Abstract

This invention relates to the fields of environmental engineering and environmental management, and in particular to a method for determining and dynamically allocating allowable pollutant emissions in industrial parks. First, the pollution carrying capacity is calculated based on the target water quality and hydrological conditions of the receiving water body. Then, the upper limit of total emission control for the park is determined by combining the emission proportions of various pollution sources in the region. Next, wastewater emission data and applicable concentration limits of enterprises in recent years are collected to calculate the initial quota for each enterprise and summarize the initial total value. Finally, a dynamic adjustment mechanism is established, comparing the initial total value with the control upper limit. If the limit is not exceeded, the initial quota is used; otherwise, enterprises are graded according to a performance evaluation system covering green, low-carbon, water resource, water risk, and water environment compliance dimensions, and the quota is adjusted according to a differentiated verification coefficient to ensure that the total amount does not exceed the upper limit. This invention makes emission determination appropriate to the water body's carrying capacity, incentivizes enterprises to improve environmental performance, enhances the flexibility and scientific nature of emission management, and contributes to the stability of water environment quality and the upgrading of environmental protection levels in industrial parks.

Description

Technical Field

[0001] This invention relates to the fields of environmental engineering and environmental management technology, specifically a method for determining and dynamically allocating the allowable emissions of pollutants in industrial parks. Background Technology

[0002] With the rapid advancement of industrialization, industrial parks, as the core carriers of industrial agglomeration, are experiencing a continuous increase in wastewater discharge and pollutant types, posing a severe challenge to the water quality of surrounding wastewater receiving bodies. The verification and rational allocation of permissible pollutant discharge limits are crucial for ensuring that the carrying capacity of water bodies is not exceeded and for achieving stable improvement in regional water quality. This is also one of the core technical requirements in the fields of environmental engineering and environmental management.

[0003] However, the current methods for determining and allocating pollutant emissions from industrial parks still have many problems that urgently need to be solved, making it difficult to meet the requirements of refined and scientific environmental management.

[0004] First, the determination of discharge volume is disconnected from the carrying capacity of water bodies. Traditional determination methods often set the total discharge volume based on empirical values ​​or a single discharge standard, without fully considering the target water quality, hydrological conditions (such as flow velocity, flow rate, and distance between river sections), and pollutant decay characteristics of the receiving water body. This results in the calculated upper limit of total discharge volume control lacking a scientific basis, often leading to situations where the total discharge exceeds the water body's pollution carrying capacity, directly causing environmental problems such as water quality deterioration and damage to the aquatic ecosystem. At the same time, some methods fail to distinguish the discharge proportions of different pollution sources such as industry, agriculture, and domestic in the region, blindly allocating industrial discharge quotas, further exacerbating the irrationality of total discharge control.

[0005] Secondly, the initial quota calculation lacks classification adaptability. There are differences in the emission paths of enterprises within the industrial park. Some enterprises discharge indirectly through centralized sewage treatment facilities, while others discharge directly into water bodies. However, the existing methods often use a uniform calculation standard to calculate the initial quota, without fully considering the differences in emission standards corresponding to different emission paths (such as the difference between the emission standards of centralized treatment facilities and the standards for direct emissions by enterprises). This results in the initial quota not matching the actual pollution discharge scenarios of enterprises, with quotas being too high or too low, affecting the fairness of allocation.

[0006] Third, there is a lack of dynamic control and performance incentive mechanisms. Traditional allocation models mostly adopt fixed quotas, which remain unchanged for a long time once determined, and cannot be dynamically adjusted according to changes in corporate environmental performance or fluctuations in water environment conditions, resulting in insufficient flexibility. At the same time, the existing performance evaluation system focuses on the compliance of pollutant emission concentrations, lacking comprehensive consideration of key dimensions such as green and low-carbon (energy and resource efficiency, technological advancement), water resource utilization (water intake, water use, and drainage efficiency), and water risk prevention and control (accident prevention and emergency response capabilities), making it difficult to fully reflect the environmental protection level of enterprises. This results in enterprises with excellent environmental performance not receiving corresponding incentives, while enterprises with poor performance lack emission reduction constraints, which is not conducive to promoting the overall improvement of the park's environmental protection level.

[0007] Fourth, the management lacks scientific rigor and precision. Existing methods lack clear quantitative grading standards and differentiated verification rules in the quota adjustment process, often adopting a "one-size-fits-all" approach to emission reduction. This may result in enterprises with large environmental protection investments and good performance bearing unreasonable emission reduction pressures, and it is also difficult to effectively force enterprises with poor performance to carry out technological transformation and management upgrades. At the same time, the data collection and accounting process lacks systematicity, and the reliability of basic data is insufficient, which further affects the accuracy of emission verification and allocation, bringing many difficulties to the supervision work of environmental management departments.

[0008] To address the shortcomings of existing technologies, there is an urgent need for a method for determining and dynamically allocating allowable pollutant emissions for industrial parks that can accurately match emission levels with water body carrying capacity, balance fairness and incentives, and have dynamic control functions. This method would solve problems such as rigidity of traditional methods, insufficient scientific basis, and imbalance of incentives and constraints, thereby helping to stabilize and improve the water environment quality of industrial parks and upgrade their environmental management level. Summary of the Invention

[0009] The purpose of this invention is to provide a method for determining and dynamically allocating the allowable emissions of pollutants in industrial parks, so as to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A method for determining and dynamically allocating allowable pollutant emissions in industrial parks includes the following steps:

[0012] Step S1: Based on the target water quality and hydrological conditions of the wastewater receiving body in the industrial park, calculate the wastewater receiving capacity of the water body; based on the wastewater receiving capacity and the proportion of emissions from various pollution sources in the area, determine the upper limit of the total allowable discharge of pollutants specifically for the industrial park.

[0013] Step S2: Collect wastewater discharge data and applicable pollutant discharge concentration limits of each enterprise in the park in recent years, calculate the initial allowable pollutant discharge quota of each enterprise, and the sum of the initial quotas of each enterprise constitutes the initial value of the total allowable pollutant discharge of the park.

[0014] Step S3: Establish and implement a dynamic environmental performance control mechanism for enterprises constrained by total emission control: Compare the initial allowable total emission amount of pollutants in the industrial park with the total emission control ceiling; if the initial total emission amount is less than or equal to the total emission control ceiling, then determine the initial quota of each enterprise as its formal allowable emission amount for the current period; if the initial total emission amount is greater than the total emission control ceiling, then activate the dynamic control mechanism, which includes:

[0015] Quantitative evaluation and classification of environmental performance: Construct a comprehensive water environment performance evaluation system that is directly related to the management of enterprise pollutant discharge, quantitatively score each enterprise in the park, and classify the enterprises into multiple priority performance levels based on the scoring results;

[0016] Differentiated emission assessment based on performance level: Different emission assessment coefficients are set for enterprises with different performance levels. The initial quota of each enterprise is reduced by the assessment coefficients to obtain a new and adjusted enterprise allowable emission allocation scheme. The constraint that the allocation scheme must meet is that the sum of the adjusted allowable emissions of all enterprises shall not exceed the total control limit.

[0017] The permitted emissions of enterprises in the adjusted allocation scheme that meets the above constraints will be determined as the formal permitted emissions of each enterprise for the current period.

[0018] As a preferred approach, the calculation of the water body's pollution carrying capacity in step S1 specifically includes the following process:

[0019] Determine the location of the industrial park's sewage discharge outlets into the river;

[0020] Identify and collect the water function zoning, target water quality concentration, and background water quality concentration at a predetermined distance upstream of the sewage outlet for the receiving water body;

[0021] Collect hydrological parameters of the wastewater body from the upstream section to the downstream assessment section. The hydrological parameters include the river section distance, water flow velocity, initial section flow rate and wastewater discharge flow rate.

[0022] Obtain the comprehensive attenuation coefficient of the target pollutant in the water body; calculate the pollution carrying capacity of the river section above the assessment section for the target pollutant by taking into account the target water quality concentration, background water quality concentration, river section distance, water flow velocity, comprehensive pollutant attenuation coefficient, initial cross-sectional flow and wastewater discharge flow.

[0023] As a preferred option, step S1 determines the maximum allowable total pollutant emission limit for the industrial park based on its pollution carrying capacity and the proportion of emissions from various pollution sources within the area. This specifically includes:

[0024] Investigate and compile statistics on the emissions of the target pollutants from all industrial, agricultural, and domestic pollution sources within the control unit where the receiving wastewater body is located;

[0025] Calculate the proportion of industrial pollution source emissions in the total emissions of the control unit;

[0026] Multiply the water body’s pollution carrying capacity by the proportion of industrial pollution sources’ emissions to obtain the upper limit of the total allowable emissions from industrial pollution sources within the control unit.

[0027] If only the industrial park discharges industrial wastewater within the control unit, then the maximum allowable discharge limit of the industrial pollution source is the maximum allowable discharge limit of the industrial park.

[0028] As a preferred option, step S2 calculates the initial allowable emission quotas for each enterprise, specifically as follows:

[0029] For enterprises that indirectly discharge wastewater through the park's centralized wastewater treatment facilities, obtain their average annual wastewater volume connected to the centralized treatment facilities within a preset period.

[0030] Multiply the average annual wastewater volume by the target pollutant concentration limit specified in the emission standards implemented by the centralized wastewater treatment facility to obtain the initial allowable pollutant emission quota for the indirect discharge enterprise.

[0031] For enterprises that directly discharge into environmental water bodies, obtain their average annual wastewater discharge within a preset period;

[0032] Multiply the average annual wastewater volume by the target pollutant concentration limit specified in the direct emission standard implemented by the enterprise to obtain the initial allowable emission quota of the direct emission enterprise.

[0033] As a preferred approach, the comprehensive water environment performance evaluation system includes multiple evaluation dimensions and specific indicators; the evaluation dimensions include at least:

[0034] The dimensions include: green and low-carbon dimensions reflecting energy resource efficiency and technological advancement; water resource dimensions reflecting water intake, use and drainage efficiency; water risk dimensions reflecting accident prevention and emergency response capabilities; and water environment compliance dimensions reflecting the implementation and compliance of environmental protection systems.

[0035] Quantitative scoring of enterprises within the park refers to scoring each enterprise's production, management, and monitoring data based on the data provided by each enterprise and publicly available data, comparing it against specific indicator scoring standards, and then weighting and summing the scores to obtain an overall performance score for each enterprise.

[0036] As a preferred approach, companies are categorized into several priority performance levels based on their scoring results, specifically including:

[0037] All participating companies are ranked from highest to lowest according to their comprehensive performance scores; companies ranked in the top 1% and with scores above the first preset threshold are classified as Grade A.

[0038] Companies that rank after the top preset percentage and before the second preset percentage, and whose scores are higher than the second preset threshold, are classified as Grade B.

[0039] Companies that rank after the second preset percentile and before the third preset percentile, and whose scores are higher than the third preset threshold, are classified as Grade C.

[0040] The remaining companies are classified as Category D.

[0041] As a preferred option, different emission verification coefficients are set for enterprises with different performance levels, specifically as follows:

[0042] For Class A enterprises, the approval coefficient is set to 1, allowing them to retain the entire initial quota;

[0043] For Class B enterprises, the approval coefficient is set to 1, allowing them to retain the entire initial quota;

[0044] For Class C enterprises, the verification coefficient is set to a preset first adjustment coefficient of less than 1, and the adjusted allowable emission is equal to the initial quota multiplied by the first adjustment coefficient.

[0045] For Class D enterprises, the verification coefficient is set to a preset second adjustment coefficient that is less than the first adjustment coefficient, and the adjusted allowable emission is equal to the initial quota multiplied by the second adjustment coefficient.

[0046] As can be seen from the technical solution provided by the present invention above, the method for determining and dynamically allocating the allowable emissions of pollutants in industrial parks provided by the present invention has the following beneficial effects:

[0047] Precisely matching discharge volume verification with water body carrying capacity: Based on the target water quality, hydrological conditions and regional pollution source discharge ratio of the industrial park's wastewater receiving body, scientifically calculate the wastewater receiving capacity and the park's total control limit, so that the verification of allowable pollutant discharge volume strictly follows the water body's environmental carrying capacity boundary, eliminating the situation where the total discharge exceeds the water body's purification capacity from the source, effectively ensuring that the water quality of the receiving body stably reaches the preset standard, and preventing the risk of water environment quality deterioration.

[0048] Incentivize enterprises to proactively improve their environmental performance: Construct a comprehensive performance evaluation system covering four dimensions: green and low-carbon development, water resource utilization, water risk prevention and control, and water environment compliance. Link emissions to enterprise environmental performance through differentiated assessment coefficients. Enterprises with excellent performance can retain all initial quotas, while enterprises with poor performance will have their quotas reduced proportionally. This creates a clear incentive and constraint mechanism, encouraging enterprises to proactively increase environmental investment, optimize production processes, improve resource utilization efficiency, and strengthen compliance management, thereby helping to upgrade the overall environmental level of the park.

[0049] Enhance the flexibility and scientific nature of emission management: Establish a dynamic control mechanism with total emission control as the core, flexibly adjust the allocation strategy based on the comparison between the initial quota and the total emission limit, and avoid the rigidity and limitations of the traditional fixed quota model; through quantitative scoring and graded verification, make quota allocation more in line with the actual environmental protection capabilities of enterprises, ensuring that the total emission of the park does not exceed the constraint limit, while providing enterprises with clear directions for environmental improvement, reducing environmental management costs, providing environmental management departments with precise and efficient control measures, and promoting the standardized and refined development of pollutant emission management in industrial parks. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the steps in the method for determining and dynamically allocating the allowable emissions of pollutants in industrial parks according to the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0052] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0053] like Figure 1 As shown in the figure, this embodiment of the invention provides a method for determining and dynamically allocating the allowable emissions of pollutants in industrial parks, including the following steps:

[0054] Step S1: Based on the target water quality and hydrological conditions of the wastewater receiving body in the industrial park, calculate the wastewater receiving capacity of the water body; based on the wastewater receiving capacity and the proportion of emissions from various pollution sources in the area, determine the upper limit of the total allowable discharge of pollutants specifically for the industrial park.

[0055] Step S2: Collect wastewater discharge data and applicable pollutant discharge concentration limits of each enterprise in the park in recent years, calculate the initial allowable pollutant discharge quota of each enterprise, and the sum of the initial quotas of each enterprise constitutes the initial value of the total allowable pollutant discharge of the park.

[0056] Step S3: Establish and implement a dynamic environmental performance control mechanism for enterprises constrained by total emission control: Compare the initial allowable total emission amount of pollutants in the industrial park with the total emission control ceiling; if the initial total emission amount is less than or equal to the total emission control ceiling, then determine the initial quota of each enterprise as its formal allowable emission amount for the current period; if the initial total emission amount is greater than the total emission control ceiling, then activate the dynamic control mechanism, which includes:

[0057] Quantitative evaluation and classification of environmental performance: Construct a comprehensive water environment performance evaluation system that is directly related to the management of enterprise pollutant discharge, quantitatively score each enterprise in the park, and classify the enterprises into multiple priority performance levels based on the scoring results;

[0058] Differentiated emission assessment based on performance level: Different emission assessment coefficients are set for enterprises with different performance levels. The initial quota of each enterprise is reduced by the assessment coefficients to obtain a new and adjusted enterprise allowable emission allocation scheme. The constraint that the allocation scheme must meet is that the sum of the adjusted allowable emissions of all enterprises shall not exceed the total control limit.

[0059] The permitted emissions of enterprises in the adjusted allocation scheme that meets the above constraints will be determined as the formal permitted emissions of each enterprise for the current period.

[0060] In this embodiment, the core function of step S1 is to determine the maximum allowable total emission limit for pollutants specific to the industrial park based on the environmental carrying capacity of the wastewater receiving body and the distribution characteristics of regional pollution sources, through basic information collection, wastewater receiving capacity calculation, emission ratio calculation, and upper limit decomposition. This provides a core constraint standard for subsequent enterprise quota allocation and dynamic regulation. The detailed steps are as follows:

[0061] Step S1-1: Collection and verification of basic information on receiving wastewater bodies:

[0062] First, GPS positioning technology was used to determine the latitude and longitude coordinates of the sewage discharge outlet into the river in the industrial park and its specific location in the river section. Then, the water function zoning category of the receiving water body where the sewage outlet is located was identified, and the corresponding target water quality concentration was determined. Simultaneously, background water quality concentration was collected at a pre-set distance upstream of the sewage outlet. The preset distance is determined based on the type of water body (rivers, lakes, etc.) and hydrological characteristics to ensure that the background water quality data can reflect the baseline water quality upstream of the sewage outlet that is not affected by the park's discharge.

[0063] Collect key hydrological parameters of the wastewater body from the upstream section to the downstream assessment section, including the distance of the river section. Water flow velocity Initial cross-sectional flow and wastewater discharge flow rate Hydrological parameters are obtained through on-site monitoring, historical data queries from hydrological stations, or simulations using professional hydrological models to ensure the timeliness and accuracy of the data; simultaneously, the comprehensive attenuation coefficient of target pollutants in the water body is obtained. This coefficient is determined through laboratory simulation experiments, inversion of field monitoring data, or reference to measured data of similar water bodies in the region, and comprehensively reflects the attenuation processes of pollutants in water bodies, such as physical diffusion, chemical degradation, and biological transformation.

[0064] After all basic information is collected, the data consistency and completeness are checked to confirm that the units of water quality concentration data are consistent (all are milligrams per cubic meter), the monitoring period and calculation cycle of hydrological parameters are matched, and the value of the comprehensive attenuation coefficient is consistent with the characteristics of the target pollutant. If there is any missing or abnormal data, the supplementary monitoring or data correction process is initiated to ensure that the basic data for subsequent pollution carrying capacity calculation is reliable.

[0065] Step S1-2: Calculation of the wastewater carrying capacity of the receiving body:

[0066] Based on the collected basic data, the water quality model method was used to calculate the river section above the assessment section's capacity to carry the target pollutants. The calculation formula is as follows: ,in, Wastewater carrying capacity, measured in cubic meters per second; The target concentration for water quality is expressed in milligrams per cubic meter. Background water quality concentration is expressed in milligrams per cubic meter. This represents the initial cross-sectional flow rate, expressed in cubic meters per second. The overall attenuation coefficient is expressed as a negative first power of seconds. The distance is for a river section, in meters. The velocity of water flow is expressed in meters per second.

[0067] During the calculation process, all parameters are first converted to a unified unit to ensure the accuracy of the calculation logic; then, the values ​​of each item are calculated sequentially according to the formula, starting with the calculation of... and The difference is then multiplied by This reflects the increase in pollutants that the water body can accommodate under the initial cross-sectional flow rate; then calculate... , , The product of and The ratio reflects the supplementary contribution of the river section's attenuation effect to the pollution carrying capacity; the sum of the two results yields the final pollution carrying capacity. After the calculation is completed, the results are compared with the reference range of pollution carrying capacity of similar water bodies in the region. If the results exceed the reasonable range, the parameter values ​​are rechecked and the calculation is repeated to ensure that the pollution carrying capacity results are consistent with the pollution carrying capacity characteristics of the actual water body.

[0068] Step S1-3: Calculation of the proportion of regional pollution source emissions:

[0069] Conduct emission surveys of various pollution sources within the control units where receiving wastewater bodies are located, covering all industrial, agricultural, and domestic pollution sources. Using enterprise emission declaration data, environmental monitoring data, agricultural production statistics, and urban domestic sewage discharge accounting data, calculate the actual emissions of target pollutants from various pollution sources, and record these as industrial pollution source emissions. Agricultural pollution source emissions Emissions from domestic pollution sources ;

[0070] Calculate the total emissions of the target pollutant within the control unit. The calculation formula is as follows: ,in, The total emissions from the control unit are expressed in kilograms per year. This refers to industrial pollution emissions, expressed in kilograms per year. This represents agricultural pollution emissions, expressed in kilograms per year. This refers to the amount of pollution emitted from domestic sources, expressed in kilograms per year.

[0071] Based on total emissions and industrial pollution source emissions, calculate the proportion of industrial pollution source emissions in the total emissions of the control unit. The calculation formula is as follows: ,in, This represents the percentage of emissions from industrial pollution sources; it has no unit and its value ranges from 0 to 1.

[0072] During the accounting process, the emission data of various pollution sources are cross-validated. The data declared by enterprises are compared with the monitoring data of environmental protection departments, and the emission of agricultural pollution sources is matched with statistical data such as planting area and breeding scale to ensure the authenticity and accuracy of the emission data. If the data difference exceeds the allowable range, a new investigation and verification will be carried out.

[0073] Step S1-4: Determining the upper limit of total quantity control for industrial parks:

[0074] The pollution carrying capacity of the receiving water body calculated in step S1-2 Converted to annual allowable emissions corresponding to emissions During the conversion process, the annual average flow rate of the receiving water body, the pollutant decay pattern, and the calculation period are combined to convert the unit of pollution carrying capacity from cubic meters per second to kilograms per year, thus obtaining the total annual pollution carrying capacity of the water body. ;

[0075] Annual total pollution discharge into water bodies Multiply by the proportion of industrial pollution source emissions calculated in step S1-3 The upper limit of the permissible total emissions from industrial pollution sources within the control unit is obtained. The calculation formula is as follows: ,in, This represents the maximum allowable total emissions from industrial pollution sources, expressed in kilograms per year.

[0076] Verify the main entities discharging industrial wastewater within the control unit. If only this industrial park discharges industrial wastewater within the control unit, then determine the upper limit of the total allowable pollutant discharge for this industrial park. Equal to the upper limit of the total allowable emissions from industrial pollution sources If other industrial wastewater dischargers exist within the control unit, further investigation should be conducted into their discharge volumes and pollution contributions, taking into account regional environmental management requirements. The pollutant discharge limits for this specific industrial park will be determined by breaking it down into smaller parts. ;

[0077] Once the total emission control ceiling is determined, a formal accounting report is generated, which clarifies the calculation process of pollution carrying capacity, the accounting results of the proportion of pollution source emissions, and the basis for determining the total emission control ceiling, providing constraint standards for the initial quota calculation of subsequent steps S2 and the dynamic regulation of S3.

[0078] In this embodiment, the core function of step S2 is to calculate the initial allowable emission quotas for each enterprise based on its emission type, actual wastewater discharge data, and corresponding emission standards. This quota is then aggregated to form the initial total allowable emission value for the park, providing fundamental data support for subsequent comparison with the total emission control ceiling and dynamic adjustment. The detailed steps are as follows:

[0079] Step S2-1: Enterprise Emission Type Determination and Basic Data Collection:

[0080] First, the emission types of all polluting enterprises in the industrial park are determined. Based on the enterprises' pollution discharge declaration materials, environmental approval documents and on-site verification results, the pollutant emission paths of each enterprise are clarified and divided into two categories: indirect discharge through the park's centralized sewage treatment facilities and direct discharge into environmental water bodies.

[0081] Basic data are collected for two types of emitting enterprises: First, the average annual wastewater volume within a preset period, typically the most recent three consecutive years. Data sources include records from the enterprise's online monitoring system, wastewater discharge test reports issued by third-party testing agencies, environmental protection department's supervisory monitoring data, and water and wastewater records in the enterprise's production ledger. Second, the applicable pollutant emission concentration limits. For indirect emitting enterprises, the target pollutant concentration limits specified in the environmental emission standards implemented by the centralized wastewater treatment facilities in the industrial park are collected. For direct emitting enterprises, the target pollutant concentration limits specified in the direct emission standards approved by the environmental protection department are collected. The concentration limits must strictly comply with the requirements of current national, local, or industry environmental protection standards.

[0082] After data collection is completed, verification and validation are carried out to check the continuity and completeness of wastewater volume data to ensure that there are no missing or unmeasured periods; verify the applicability of concentration limits to confirm that they are consistent with the enterprise's emission type, production process and environmental approval requirements; trace and verify the source of data anomalies, and correct deviations by comparing data from different sources and checking the enterprise's production operation records to ensure that the basic data is true and reliable.

[0083] Step S2-2: Initial quota calculation for indirect emission enterprises:

[0084] For enterprises that indirectly discharge wastewater through the park's centralized wastewater treatment facilities, the initial quota is calculated based on the collected basic data, using the following formula: ,in, The initial allowable emission quota for pollutants for enterprises that indirectly emit pollutants, in kilograms per year; The average annual wastewater volume of the enterprise to be connected to the centralized treatment facility within the preset time limit, in cubic meters per year; The target pollutant concentration limit specified in the emission standards implemented by the centralized wastewater treatment facilities in the park, in milligrams per cubic meter;

[0085] During the calculation process, a unified unit conversion must be completed, converting the unit of the concentration limit from milligrams per cubic meter to kilograms per cubic meter, i.e., 1 milligram per cubic meter equals 0.001 kilograms per cubic meter, to ensure that the wastewater volume and the unit of the concentration limit match. After the calculation is completed, the results are checked for reasonableness by comparing the calculated value with the company's historical emission data and the emission level of companies of similar size in the same industry. If the deviation exceeds the reasonable range, the values ​​of the annual average wastewater volume and the concentration limit are re-checked, corrected, and recalculated.

[0086] Step S2-3: Calculation of initial quotas for direct emission enterprises:

[0087] For enterprises that directly discharge into environmental water bodies, the same calculation logic as for indirect discharge enterprises is used to calculate the initial quota, combined with their specific basic data. The calculation formula is as follows: ,in, The initial allowable emission quota for pollutants for enterprises that directly discharge pollutants, in kilograms per year; The average annual wastewater volume that the company will directly discharge within the preset time frame is given in cubic meters per year. The target pollutant concentration limit specified in the direct emission standards implemented by the enterprise, expressed in milligrams per cubic meter;

[0088] The same unit conversion process is followed to ensure that the concentration limit unit matches the wastewater volume unit. After calculation, a double verification is carried out. On the one hand, the accuracy of the formula application and unit conversion is checked. On the other hand, the calculation results are compared with the enterprise's environmental permit scope and production load to confirm that the initial quota calculation results are consistent with the enterprise's actual pollution discharge capacity. If there is a contradiction, the basic data is re-verified and the calculation is adjusted.

[0089] Step S2-4: Summary of initial values ​​for the total allowable emissions of pollutants in the park:

[0090] After completing the initial quota calculation for all enterprises, the quotas for each enterprise will be... and By summarizing the data, we obtain the initial value of the total allowable emissions of pollutants in the park. The calculation formula is as follows: ,in, This represents the initial allowable total amount of pollutants to be discharged from the park, expressed in kilograms per year. This represents the total number of polluting enterprises within the park participating in quota calculations. For the first The initial allowable emission quota for pollutants for each enterprise is expressed in kilograms per year, and the corresponding quota for indirect emission enterprises is... Direct emission enterprises correspond ;

[0091] During the aggregation process, an initial quota ledger for enterprises is established, recording in detail the enterprise name, emission type, annual average wastewater volume, concentration limit, initial quota, and calculation basis for each enterprise. At the same time, an aggregation report is generated, clarifying the calculation process, data source, and quota ratio of each enterprise for the initial value of the total amount in the park. This provides clear data support for the comparative analysis with the total control upper limit in step S3 and the activation of the dynamic control mechanism.

[0092] In this embodiment, the core function of step S3 is to use the upper limit of the total allowable emission control of pollutants in the park as a rigid constraint, determine whether to initiate dynamic regulation by comparing the total amount, construct an environmental performance evaluation system to classify enterprises, implement differentiated emission verification, and finally form a formal allowable emission allocation plan for enterprises that meet the total amount constraint, thereby achieving precise control and optimized allocation of pollutant emissions; the detailed steps are as follows:

[0093] Step S3-1: Overall Comparison and Judgment of Dynamic Regulation Activation:

[0094] First, retrieve the upper limit of the allowable total pollutant emission control for the industrial park determined in step S1. And the initial value of the total allowable emissions of pollutants in the park calculated in step S2. Numerical comparative analysis was conducted.

[0095] The comparison results fall into two categories: if This indicates that the total initial quota of the park did not exceed the control limit corresponding to the water body's carrying capacity, and there is no need to initiate dynamic regulation. The initial quota of each enterprise can be directly transferred. Determine the official allowable emissions for the current cycle and record them for future reference; if This indicates that the total initial quota exceeds the control limit, and the enterprise's dynamic environmental performance adjustment mechanism should be activated immediately to achieve total reduction through subsequent grading and differentiated assessment, so as to ensure that the total emissions meet the constraints.

[0096] During the comparison process, the calculation basis of the two key data points needs to be verified simultaneously to confirm their accuracy. The calculation of pollution carrying capacity and the accounting of emission ratio are without deviation. The enterprise's basic data collection and initial quota calculation are accurate, avoiding inappropriate regulatory decisions due to data errors;

[0097] Step S3-2: Construction of a comprehensive water environment performance evaluation system:

[0098] After dynamic regulation is initiated, the first step is to construct a comprehensive water environment performance evaluation system that is directly related to pollutant discharge management, and to clarify the evaluation dimensions, specific indicators and scoring standards.

[0099] The evaluation system comprises four core dimensions, each with clearly defined indicator directions: The green and low-carbon dimension focuses on energy resource efficiency and technological advancement, with specific indicators including energy consumption per unit of output, clean production audit level, proportion of investment in environmental technology upgrades, and proportion of renewable energy use; the water resource dimension emphasizes water intake, use, and drainage efficiency, with specific indicators including water reuse rate, water intake per unit of product, stability of drainage compliance, and water-saving facility coverage rate; the water risk dimension focuses on accident prevention and emergency response capabilities, with specific indicators including the completeness of environmental risk emergency plans, configuration of emergency monitoring equipment, frequency of risk and hazard investigation, and ability to handle sudden water pollution incidents; and the water environment compliance dimension revolves around the implementation and compliance with environmental regulations, with specific indicators including the discharge permit implementation rate, pollutant discharge monitoring data compliance rate, environmental administrative penalty records, and completeness of environmental ledgers.

[0100] To ensure the scientific rigor of the evaluation, weighting coefficients were assigned to each dimension. , , , The sum of weights satisfies The weights were determined using the analytic hierarchy process combined with scores from industry experts, with the water environment compliance dimension having a weight of no less than 0.3, emphasizing the principle of prioritizing compliance. At the same time, scoring standards were established for each specific indicator, with each indicator having a score range of 0 to 100 points, clearly defining the score range corresponding to different levels of compliance. For example, a 100% compliance rate for pollutant emission monitoring data would receive 100 points, 90% to 99% would receive 80 points, 80% to 89% would receive 60 points, and below 80% would receive 0 points.

[0101] Step S3-3: Quantitative scoring of corporate environmental performance:

[0102] Production management and monitoring data from various enterprises within the park are collected. Data sources include publicly available and filed data such as enterprise self-reported materials, environmental protection department monitoring reports, online monitoring system records, cleaner production audit reports, and pollutant discharge permit implementation reports. Based on the specific indicators and scoring standards of the evaluation system, each enterprise is scored item by item, and scores are calculated for each dimension: green and low-carbon dimension score. Water Resources Dimension Score Water risk dimension score Water environment compliance score The scores for each dimension were all within the range of 0 to 100.

[0103] Based on the scores and corresponding weights of each dimension, the overall corporate performance score is calculated by weighted summation. The calculation formula is as follows: ,in, The overall performance score for enterprises ranges from 0 to 100. , , , These are the weighting coefficients for each evaluation dimension; , , , The scores for each dimension are as follows;

[0104] After the scoring is completed, cross-verification is carried out by comparing the data declared by enterprises with the data verified by the environmental protection department. For enterprises with abnormal scores, data is traced back to verify the compliance of indicators and the scoring results are corrected to ensure that the comprehensive performance score objectively reflects the actual environmental performance level of enterprises.

[0105] Step S3-4: Enterprise Performance Rating Classification

[0106] All participating companies will be scored based on their overall performance. Sort the data from highest to lowest, and determine three preset percentages and three preset thresholds: the first preset percentage is set to 20%, the second preset percentage to 60%, and the third preset percentage to 90%; the first preset threshold... Set to 85 points, second preset threshold Set to 60 points, third preset threshold Set at 40 points, to meet the requirements. ;

[0107] Performance levels are determined based on ranking results and threshold conditions: those ranked in the top 20% and... Companies ranked between 20% and 60% are classified as Grade A; Companies ranked between 60% and 90% are classified as Grade B; Companies ranked below C are classified as Category C; the remaining companies ranked below 90% or... Enterprises are classified as Grade D;

[0108] After the grading is completed, a reasonableness review is conducted to check whether the number and industry distribution of enterprises in each grade are consistent with the actual situation of the park. If enterprises in a certain industry are concentrated in a certain grade and are inconsistent with the overall environmental protection level of the industry, the scoring details of the enterprises in that industry need to be re-verified, and the preset percentages or thresholds may be adjusted as necessary to ensure that the grading is fair and reasonable.

[0109] Step S3-5: Setting the Differentiated Emission Verification Coefficient:

[0110] Based on the priority of performance levels, corresponding emission verification coefficients are set for enterprises of different levels. The coefficient values ​​follow the principle of "the better the performance, the higher the verification coefficient," and are specifically set as follows: Verification coefficient for Level A enterprises. Allowing the retention of the entire initial quota; Approval coefficient for Category B enterprises. Similarly, retaining the entire initial quota is allowed; C-level enterprise approval coefficient The preset first adjustment coefficient is set to 0.8, which satisfies... D-level enterprise verification coefficient The second adjustment coefficient is preset to a value of 0.5, which satisfies... ;

[0111] The verification coefficient can be dynamically adjusted based on factors such as the park's pollution reduction needs and industry characteristics, but it must be ensured that the adjusted coefficient remains unchanged. The relationship must be established, and the adjustment process must be open and transparent, with clear basis for the adjustment and public disclosure to the enterprise;

[0112] Step S3-6: Calculation of Enterprise Permitted Emissions Adjustment:

[0113] Based on each enterprise's initial quota and corresponding level approval coefficient, the adjusted allowable emissions for enterprises are calculated using the following formula: ,in, The adjusted allowable emissions for enterprises are expressed in kilograms per year. This refers to the initial allowable emission quota for pollutants for enterprises. This refers to the assigned coefficient corresponding to the company's performance level; for example, level A corresponds to... Class B corresponds to C level corresponds to Class D corresponds to ;

[0114] After completing the adjustment calculations for each enterprise, summarize the results for all enterprises. The total allowable pollutant emissions after the park's adjustment were obtained. The calculation formula is as follows: ,in, This represents the total volume for the park after adjustments, expressed in kilograms per year. This represents the total number of polluting enterprises within the industrial park. For the first Adjusted emission limits for each company;

[0115] Step S3-7: Constraint verification of allocation scheme and determination of formal quota:

[0116] The adjusted allocation plan is subject to total constraint verification, with the core verification standard being: If the verification passes, it indicates that the adjusted total amount meets the upper limit of the allowable total emission control requirements for pollutants in the park, and the emissions from each enterprise will be directly included. This is determined as the official allowable emission level for the current cycle; if the verification fails, i.e. The assessment coefficients need to be fine-tuned, with priority given to reducing the ratings of D-level enterprises. (Minimum not lower than 0.3), if still not met, the rating for C-level enterprises should be appropriately lowered. (Minimum not less than 0.6), recalculate and until satisfied ;

[0117] Once the official allowable emissions are determined, a dynamic allocation plan report for the allowable emissions of pollutants in the park will be generated, clarifying the performance level, verification coefficient, initial quota, adjusted official quota and calculation basis of each enterprise. At the same time, a quota management ledger will be established to provide complete data support for subsequent pollution discharge supervision, periodic assessment and the next round of quota adjustment.

[0118] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for determining and dynamically allocating allowable pollutant emissions in industrial parks, characterized in that: Includes the following steps: Step S1: Based on the target water quality and hydrological conditions of the wastewater receiving body in the industrial park, calculate the wastewater receiving capacity of the water body; based on the wastewater receiving capacity and the proportion of emissions from various pollution sources in the area, determine the upper limit of the total allowable discharge of pollutants specifically for the industrial park. Step S2: Collect wastewater discharge data and applicable pollutant discharge concentration limits of each enterprise in the park in recent years, calculate the initial allowable pollutant discharge quota of each enterprise, and the sum of the initial quotas of each enterprise constitutes the initial value of the total allowable pollutant discharge of the park. Step S3: Establish and implement a dynamic environmental performance control mechanism for enterprises with total emission control as a constraint: compare the initial value of the total allowable emission of pollutants in the park with the upper limit of the total emission control; If the initial total amount is less than or equal to the total control limit, then the initial quota of each enterprise will be determined as its formal allowable emission amount for the current cycle. If the initial total amount exceeds the upper limit of total control, a dynamic adjustment mechanism will be activated. The dynamic adjustment mechanism includes: Quantitative evaluation and classification of environmental performance: Construct a comprehensive water environment performance evaluation system that is directly related to the management of enterprise pollutant discharge, quantitatively score each enterprise in the park, and classify the enterprises into multiple priority performance levels based on the scoring results; Differentiated emission assessment based on performance level: Different emission assessment coefficients are set for enterprises with different performance levels. The initial quota of each enterprise is reduced by the assessment coefficients to obtain a new and adjusted enterprise allowable emission allocation scheme. The constraint that the allocation scheme must meet is that the sum of the adjusted allowable emissions of all enterprises shall not exceed the total control limit. The permitted emissions of enterprises in the adjusted allocation scheme that meets the above constraints will be determined as the formal permitted emissions of each enterprise for the current period.

2. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 1, characterized in that: Step S1, calculating the water body's pollution carrying capacity, specifically includes the following processes: Determine the location of the industrial park's sewage discharge outlets into the river; Identify and collect the water function zoning, target water quality concentration, and background water quality concentration at a predetermined distance upstream of the sewage outlet for the receiving water body; Collect hydrological parameters of the wastewater body from the upstream section to the downstream assessment section. The hydrological parameters include the river section distance, water flow velocity, initial section flow rate and wastewater discharge flow rate. Obtain the comprehensive attenuation coefficient of the target pollutant in the water body; calculate the pollution carrying capacity of the river section above the assessment section for the target pollutant by taking into account the target water quality concentration, background water quality concentration, river section distance, water flow velocity, comprehensive pollutant attenuation coefficient, initial cross-sectional flow and wastewater discharge flow.

3. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 1, characterized in that: Step S1 determines the maximum allowable total pollutant emission limit for the industrial park based on its pollution carrying capacity and the proportion of emissions from various pollution sources within the area. This includes: Investigate and compile statistics on the emissions of the target pollutants from all industrial, agricultural, and domestic pollution sources within the control unit where the receiving wastewater body is located; Calculate the proportion of industrial pollution source emissions in the total emissions of the control unit; Multiply the water body’s pollution carrying capacity by the proportion of industrial pollution sources’ emissions to obtain the upper limit of the total allowable emissions from industrial pollution sources within the control unit. If only the industrial park discharges industrial wastewater within the control unit, then the maximum allowable discharge limit of the industrial pollution source is the maximum allowable discharge limit of the industrial park.

4. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 1, characterized in that: Step S2 calculates the initial allowable emission quotas for each enterprise, specifically as follows: For enterprises that indirectly discharge wastewater through the park's centralized wastewater treatment facilities, obtain their average annual wastewater volume connected to the centralized treatment facilities within a preset period. Multiply the average annual wastewater volume by the target pollutant concentration limit specified in the emission standards implemented by the centralized wastewater treatment facility to obtain the initial allowable pollutant emission quota for the indirect discharge enterprise. For enterprises that directly discharge into environmental water bodies, obtain their average annual wastewater discharge within a preset period; Multiply the average annual wastewater volume by the target pollutant concentration limit specified in the direct emission standard implemented by the enterprise to obtain the initial allowable emission quota of the direct emission enterprise.

5. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 1, characterized in that: The comprehensive water environment performance evaluation system includes multiple evaluation dimensions and specific indicators; the evaluation dimensions include at least: The dimensions include: green and low-carbon dimensions reflecting energy resource efficiency and technological advancement; water resource dimensions reflecting water intake, use and drainage efficiency; water risk dimensions reflecting accident prevention and emergency response capabilities; and water environment compliance dimensions reflecting the implementation and compliance of environmental protection systems. Quantitative scoring of enterprises within the park refers to scoring each enterprise's production, management, and monitoring data based on the data provided by each enterprise and publicly available data, comparing it against specific indicator scoring standards, and then weighting and summing the scores to obtain an overall performance score for each enterprise.

6. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 5, characterized in that: Based on the scoring results, companies are divided into several priority performance levels, specifically including: All participating companies are ranked from highest to lowest according to their comprehensive performance scores; companies ranked in the top 1% and with scores above the first preset threshold are classified as Grade A. Companies that rank after the top preset percentage and before the second preset percentage, and whose scores are higher than the second preset threshold, are classified as Grade B. Companies that rank after the second preset percentile and before the third preset percentile, and whose scores are higher than the third preset threshold, are classified as Grade C. The remaining companies are classified as Category D.

7. The method for determining and dynamically allocating allowable pollutant emissions in industrial parks according to claim 6, characterized in that: Different emission verification coefficients are set for enterprises with different performance levels, and the specific settings are as follows: For Class A enterprises, the approval coefficient is set to 1, allowing them to retain the entire initial quota; For Class B enterprises, the approval coefficient is set to 1, allowing them to retain the entire initial quota; For Class C enterprises, the verification coefficient is set to a preset first adjustment coefficient of less than 1, and the adjusted allowable emission is equal to the initial quota multiplied by the first adjustment coefficient. For Class D enterprises, the verification coefficient is set to a preset second adjustment coefficient that is less than the first adjustment coefficient, and the adjusted allowable emission is equal to the initial quota multiplied by the second adjustment coefficient.

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