River total nitrogen traceability responsibility quantitative analysis method

Abstract

The invention discloses a river total nitrogen source tracing responsibility quantitative analysis method, and belongs to the technical field of environmental monitoring, and the method comprises the steps: dividing total nitrogen sources according to main industries affecting water environment total nitrogen in human activities, and calculating total nitrogen emissions of industry, life, agriculture, livestock and poultry breeding and aquaculture respectively to obtain total nitrogen emissions of a research area; on the basis of the total nitrogen emission amount, dividing the research area into a plurality of sub-areas, and calculating the emission reduction indexes of the sub-areas to obtain the emission reduction potentials of the sub-areas; based on the total nitrogen emission amount and the emission reduction potential, locking the main responsibility industry, and determining a treatment priority area according to the ratio of the monitored concentration to the control target; according to the main emission sources, the responsibilities of the main industries and the areas needing to be treated preferentially, key areas, key river reaches and key industries where the total nitrogen is increased are determined and checked, the individual responsibilities of emission reduction are obtained, and the problems that treatment decisions cannot accurately focus on the main emission sources and resource allocation is low in efficiency due to the fact that only the pollutant in-river amount is considered and the total nitrogen sources are ignored are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental monitoring, and particularly relates to a river total nitrogen source tracing and responsibility quantification analysis method. BACKGROUND

[0002] River total nitrogen pollution has become one of the key factors affecting the ecological environment quality of rivers and nearshore sea areas. Total nitrogen is not a single form of pollutant, and its composition is complex, usually including inorganic nitrogen (ammonia nitrogen, nitrate nitrogen, nitrite nitrogen), organic nitrogen and particulate nitrogen and other forms. Among them, organic nitrogen is mainly derived from the discharge of domestic sewage, livestock and poultry manure, agricultural waste, etc., and due to its difficulty in rapid degradation, it can gradually transform into inorganic nitrogen in water, forming "secondary pollution", thereby causing long-term and cumulative impact on the aquatic ecological environment.

[0003] In terms of pollution sources, non-point source pollution, especially agricultural non-point source pollution, has become the main contributor to total nitrogen pollution, and its discharge has the characteristics of dispersion, intermittence and randomness, etc., and it is difficult to control. At the same time, urban and rural domestic sewage and industrial point source discharge also have an undeniable impact on total nitrogen load. Especially in the northern region, the river total nitrogen pollution presents a significant seasonal characteristic. The dry season water shortage and the cutoff phenomenon caused by the regulation of locks and dams are common, which makes organic nitrogen, ammonia nitrogen and other pollutants stay and accumulate in ditches, soil and groundwater systems for a long time, and gradually transform into stable nitrate nitrogen through complex physical and chemical processes. After the rainy season, these accumulated nitrogen is continuously released into the river with runoff, causing periodic and impact pollution pressure on the downstream water body and nearshore sea area.

[0004] At present, the river total nitrogen treatment and control is facing a series of challenges: first, the sources of total nitrogen are complex and diverse, and non-point source pollution accounts for a high proportion, which is difficult to accurately trace and clarify the responsibility; second, the existing treatment means often focuses on the reduction of pollutant inflow, but ignores the whole process of emission control from the source to the migration path, especially lacking systematic quantitative analysis of total nitrogen emission of various pollution sources; third, due to the limitations of monitoring means, data basis and method system, the regional distribution of total nitrogen pollution, industry contribution and key responsible subjects are difficult to accurately lock, resulting in insufficient targeting and low efficiency of treatment measures.

[0005] Therefore, it is urgent to establish a systematic and quantitative river total nitrogen source tracing and responsibility analysis method. SUMMARY

[0006] In view of the above-mentioned deficiencies in the prior art, the river total nitrogen source tracing and responsibility quantification analysis method provided by the present application solves the problem that the existing method only considers the accounting and reduction of end pollutant inflow, lacks systematic quantitative analysis of total nitrogen emission of various pollution sources in the region, total nitrogen emission reduction potential and key areas, thereby causing the treatment decision to be unable to accurately focus on the main emission source and the low efficiency of resource allocation.

[0007] To achieve the aforementioned objectives, the technical solution adopted in this application is as follows: This application provides a quantitative analysis method for tracing the source and assigning responsibility for total nitrogen in rivers, including: S1: Based on the main industries that affect the total nitrogen in the water environment in human activities, the sources of total nitrogen are divided, and the total nitrogen emissions from industrial sources, urban domestic sources, rural domestic sources, agricultural planting sources, livestock and poultry breeding sources and aquaculture sources are calculated separately to obtain the total nitrogen emissions in the study area; S2: Based on the total nitrogen emissions in the study area, the study area is divided into multiple sub-regions, and the emission reduction index of each sub-region is calculated to obtain the emission reduction potential of the sub-regions; S3: Based on the total nitrogen emissions and emission reduction potential of the study area, the main emission sources and the main industry responsibilities for total nitrogen treatment and control are obtained. The ratio of the total nitrogen concentration monitored at river monitoring points to the total nitrogen control target concentration is used as the treatment priority index. Based on the treatment optimization index, the areas that need to be given priority for treatment are obtained. S4: Based on the main emission sources, the responsibilities of major industries, and the areas requiring priority treatment, identify and investigate key areas, key river sections, and key industries where total nitrogen levels are rising, and determine the individual responsibilities for emission reduction.

[0008] Further, S1 includes: S101: Calculate the total nitrogen emissions from industrial sources based on the wastewater discharge volume and total nitrogen concentration automatically monitored at the river discharge outlets. The calculation formula is as follows:

[0009] In the formula, Total nitrogen emissions from industrial sources For the first Total nitrogen concentration at industrial wastewater discharge outlets into rivers, For the first Wastewater discharge from industrial outlets into rivers The number of industrial sewage outlets discharging into rivers; S102: Calculate the total nitrogen emissions from urban domestic sources based on the generation and removal of total nitrogen from domestic sewage in urban and county built-up areas. The calculation formula is as follows:

[0010] In the formula, Total nitrogen emissions from urban domestic sources For permanent residents of urban areas, The pollution generation coefficient, The amount of water entering urban sewage treatment plants, The average total nitrogen concentration in the influent of urban domestic wastewater treatment plants. The average total nitrogen removal rate of urban domestic wastewater treatment plants; S103: Calculate the total nitrogen emissions from rural domestic sources based on the rural resident population and the collection and treatment of domestic sewage. The calculation formula is as follows:

[0011] In the formula, This refers to the total nitrogen emissions from rural domestic sources. For rural permanent residents, The total nitrogen pollution coefficient, To improve the rural domestic sewage treatment rate, Total nitrogen removal rate; S104: Calculate the total nitrogen emissions from agricultural planting sources based on planting area, nitrogen fertilizer application rate, loss coefficient, etc. The calculation formula is as follows:

[0012] In the formula, Total nitrogen emissions from agricultural planting sources For the first The planting area of ​​each plot of land, For the first Total nitrogen loss coefficient of each plot, To adjust the coefficient, The number of plots; S105: Calculate the total nitrogen emissions from livestock and poultry farming sources based on the scale of farming and pollution discharge coefficient. The calculation formula is as follows:

[0013] In the formula, Total nitrogen emissions from livestock and poultry farming For the first The scale of livestock and poultry breeding, For the first Pollution coefficient of breeding livestock and poultry This refers to the number of livestock and poultry species. S106: Calculate the total nitrogen emissions from aquaculture sources based on production volume and pollution discharge coefficient. The calculation formula is as follows:

[0014] In the formula, Total nitrogen emissions from aquaculture For the first The yield of aquatic products For the first Pollution coefficient of breeding livestock and poultry This refers to the number of livestock and poultry species. S107: Based on the total nitrogen emissions from industrial sources, urban residential sources, rural residential sources, agricultural planting sources, livestock and poultry breeding sources, and aquaculture sources, the total nitrogen emissions in the study area are calculated using the following formula:

[0015] In the formula, The total nitrogen emission amount of the research area is researched.

[0016] Further, the calculation formula of the emission reduction index is:

[0017] In the formula, The total nitrogen emission reduction index of the research area is researched, The sewage collection and treatment rate of the industrial enterprise and the park is, The urban domestic sewage collection and treatment rate is, The rural domestic sewage collection and treatment rate is, The proportion of organic fertilizer in the total amount of fertilizer application in the planting industry is, The manure collection and treatment rate of livestock and poultry breeding is, The tail water treatment rate of aquaculture is.

[0018] Further, the emission reduction potential includes: The lower the emission reduction index of the sub-area is, the greater the emission reduction potential of the sub-area is.

[0019] Further, the area needing to be managed in priority based on the management optimization index includes: The calculation formula of the management priority index is:

[0020] In the formula, The management priority index is, The total nitrogen monitoring concentration is, The total nitrogen control target concentration is; When the management priority index exceeds 1, the sub-area corresponding to the river monitoring point needs to be managed in priority; otherwise, the sub-area corresponding to the river monitoring point meets the control requirement.

[0021] The beneficial effects of the present application are: The river total nitrogen traceability quantitative analysis method provided by the present application calculates the total nitrogen input amount in the area, mainly uses environmental statistical data, and additionally uses industry statistical data, scientifically calculates the total nitrogen emission amount of the area and the river basin, clearly defines the industry responsibility of emission reduction, avoids the prior art which is limited to the river inflow analysis method and ignores the source treatment and total nitrogen emission amount analysis. And combined with the river total nitrogen monitoring data, the key river sections and key areas with high total nitrogen are identified, the hot grid of total nitrogen is clearly defined, the key areas are locked, and important technical support is provided for river total nitrogen management and control. BRIEF DESCRIPTION OF DRAWINGS

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0023] Figure 1 This is a flowchart illustrating a quantitative analysis method for tracing the source of total nitrogen in rivers, provided in an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0025] Example 1: This application provides a quantitative analysis method for tracing and identifying the source of total nitrogen in rivers. This method can be found in [reference needed]. Figure 1 , Figure 1 The diagram shown is a flowchart illustrating a quantitative analysis method for tracing the source and clarifying responsibility of total nitrogen in rivers, provided in an embodiment of this application. The method includes: S1: Based on the main industries that affect the total nitrogen in the water environment through human activities, the sources of total nitrogen are divided, and the total nitrogen emissions from industrial sources, urban domestic sources, rural domestic sources, agricultural planting sources, livestock and poultry breeding sources, and aquaculture sources are calculated separately to obtain the total nitrogen emissions in the study area.

[0026] In one embodiment of this application, this step, through methods such as consulting statistical yearbooks of the study area and industry statistical yearbooks, conducting on-site surveys and monitoring, focuses on calculating the total nitrogen emissions of different industries through data analysis. The calculation process includes: S101: Calculate the total nitrogen emissions from industrial sources based on the wastewater discharge volume and total nitrogen concentration automatically monitored at the river discharge outlets. The calculation formula is as follows:

[0027] In the formula, Total nitrogen emissions from industrial sources For the first Total nitrogen concentration at industrial wastewater discharge outlets into rivers, For the first Wastewater discharge from industrial outlets into rivers The number of industrial sewage outlets discharging into rivers; S102: Calculate the total nitrogen emissions from urban domestic sources based on the generation and removal of total nitrogen from domestic sewage in urban and county built-up areas. The calculation formula is as follows:

[0028] In the formula, Total nitrogen emissions from urban domestic sources For permanent residents of urban areas, The pollution generation coefficient, The amount of water entering urban sewage treatment plants, The average total nitrogen concentration in the influent of urban domestic wastewater treatment plants. The average total nitrogen removal rate of urban domestic wastewater treatment plants; S103: Calculate the total nitrogen emissions from rural domestic sources based on the rural resident population and the collection and treatment of domestic sewage. The calculation formula is as follows:

[0029] In the formula, This refers to the total nitrogen emissions from rural domestic sources. For rural permanent residents, The total nitrogen pollution coefficient, To improve the rural domestic sewage treatment rate, Total nitrogen removal rate; S104: Calculate the total nitrogen emissions from agricultural planting sources based on planting area, nitrogen fertilizer application rate, loss coefficient, etc. The calculation formula is as follows:

[0030] In the formula, Total nitrogen emissions from agricultural planting sources For the first The planting area of ​​each plot of land, For the first Total nitrogen loss coefficient of each plot, To adjust the coefficient, The number of plots; S105: Calculate the total nitrogen emissions from livestock and poultry farming sources based on the scale of farming and pollution discharge coefficient. The calculation formula is as follows:

[0031] In the formula, Total nitrogen emissions from livestock and poultry farming For the first The scale of livestock and poultry breeding, For the first Pollution coefficient of breeding livestock and poultry This refers to the number of livestock and poultry species. S106: Calculate the total nitrogen emissions from aquaculture sources based on production volume and pollution discharge coefficient. The calculation formula is as follows:

[0032] In the formula, is the total nitrogen emission amount of the aquaculture source, is the yield of the aquaculture, is the pollution discharge coefficient of the livestock and poultry, is the number of livestock and poultry species; S107: Sum the total nitrogen emission amounts of the industrial source, urban domestic source, rural domestic source, agricultural planting source, livestock and poultry breeding source, and aquaculture source to calculate the total nitrogen emission amount of the research area, and the calculation formula is:

[0033] In the formula, is the total nitrogen emission amount of the research area.

[0034] S2: Energy saving and emission reduction analysis: This step uses the emission reduction index to quantify the total nitrogen emission reduction potential of the research area. On the basis of the previous step, further investigate the total nitrogen treatment level of different industries, analyze the emission reduction potential of the research area from the perspective of centralized collection and treatment of wastewater to reduce the total nitrogen pollution into rivers, and then obtain the main emission sources and the main industry responsibilities of total nitrogen treatment and control. Divide the research area into several sub-regions, calculate the emission reduction index respectively, and the lower the emission reduction index value of a sub-region, the greater the emission reduction potential. The calculation formula of the emission reduction index is:

[0035] In the formula, is the total nitrogen emission reduction index of the research area, is the wastewater collection and treatment rate of industrial enterprises and parks, is the urban domestic wastewater collection and treatment rate, is the rural domestic wastewater collection and treatment rate, is the proportion of organic fertilizer in the total amount of fertilizer application in planting, is the livestock and poultry breeding manure collection and treatment rate, is the aquaculture tail water treatment rate.

[0036] In an embodiment of the present application, the industrial enterprise and park sewage collection and treatment rate is the industrial enterprise and park sewage treatment amount in the study area / total sewage discharge amount x 100%, the urban domestic sewage collection and treatment rate is the amount of sewage actually treated by professional facilities such as sewage treatment plants in the study area / total urban domestic sewage discharge amount x 100%, the rural domestic sewage collection and treatment rate is the amount of treated domestic sewage in the study area / total rural domestic sewage generation amount x 100%, the proportion of organic fertilizer in the total amount of fertilizer applied in planting is the amount of pure nutrient of organic fertilizer / (amount of pure nutrient of chemical fertilizer + amount of pure nutrient of organic fertilizer) x 100%, the livestock and poultry breeding manure collection and treatment rate is the amount of comprehensive utilization of livestock and poultry manure in the study area / total livestock and poultry manure generation amount x 100%, and the aquaculture tail water treatment rate is the volume or area of breeding water that achieves standard discharge or recycling / total breeding water volume or area x 100%.

[0037] S3: Encryption monitoring: This step uses regional priority index to quantify the priority of the region. Monitoring points are arranged at the administrative boundaries of the river (usually municipal or county boundaries), branch stream confluence entrances and other regions to monitor the total nitrogen concentration and the ratio of the total nitrogen control target concentration as the management priority index. When the management priority index > 1, the higher the value, the higher the priority of the sub-region for total nitrogen management; when the management priority index ≤ 1, it indicates that the sub-region meets the control requirements, and the calculation formula of the management priority index is:

[0038] In the formula, is the management priority index, is the total nitrogen monitoring concentration, is the total nitrogen control target concentration.

[0039] S4: Blanket investigation: According to the results of encryption monitoring and industry analysis, combined with satellite remote sensing technology, total nitrogen hot spot grid and key industries are implemented by blanket investigation, and various "dry season hidden pollution" problems are found out, problem list is established and rectification is supervised, and individual responsibility for emission reduction is clarified.

[0040] Embodiment 2: The total nitrogen emission of Qinhuangdao in Hebei Province is calculated by using the above-mentioned related calculation formula, as shown in Table 1, and the total nitrogen emission of industrial sources, urban domestic sources, rural domestic sources, agricultural planting sources, livestock and poultry breeding sources and aquaculture sources is shown in Tables 2-7.

[0041] Table 1 Total nitrogen emission of Qinhuangdao in Hebei Province

[0042] Through statistical analysis, it is found that the livestock and poultry breeding source is the first source of total nitrogen.

[0043] Table 2 Total nitrogen emissions of the planting industry

[0044] According to the total nitrogen emission calculation formula of the agricultural planting source, the total nitrogen emission of the planting industry in each county and district is calculated, and then summed up to obtain the total nitrogen emission of the planting source in Qinhuangdao, which is 174 tons.

[0045] Table 3 Total nitrogen emissions of the livestock and poultry breeding industry

[0046] According to the total nitrogen emission calculation formula of the livestock and poultry breeding source, the total nitrogen emission of the livestock and poultry breeding source of the two types of large-scale and farmers in each county and district is calculated, and then summed up to obtain the total nitrogen emission of the livestock and poultry breeding source, which is 1910.57 tons.

[0047] Table 4 Total nitrogen emissions of the aquaculture industry in Qinhuangdao City

[0048] According to the total nitrogen emission calculation formula of the aquaculture industry, the total nitrogen emission of the aquaculture industry in each township is calculated, and then summed up to obtain the total nitrogen emission of the aquaculture industry in Qinhuangdao City, which is 15.83 tons.

[0049] Table 5 Total nitrogen emissions of urban domestic sewage

[0050] According to the total nitrogen emission calculation formula of urban domestic sewage, the total nitrogen emission of urban domestic sewage in each district and county is calculated, and then summed up to obtain the total nitrogen emission of urban domestic sewage in Qinhuangdao City, which is 678.66 tons.

[0051] Table 6 Total nitrogen emissions of rural domestic sewage

[0052] According to the total nitrogen emission calculation formula of rural domestic sewage, the total nitrogen emission of rural domestic sewage in each district and county is calculated, and then summed up to obtain the total nitrogen emission of rural domestic sewage in Qinhuangdao City, which is 202.74 tons.

[0053] Table 7 Total nitrogen emissions of industrial sources

[0054] According to the total nitrogen emission calculation formula of industrial sources, the total nitrogen emission of industrial sources in each district and county is calculated, and then summed up to obtain the total nitrogen emission of industrial sources in Qinhuangdao City, which is 94.29 tons.

[0055] On the basis of the previous step, further investigate the total nitrogen management level of different industries, analyze the regional emission reduction potential from the perspective of centralized collection and treatment of sewage, reducing the total nitrogen pollution into the river, and then get the main emission sources and the main industry responsibility of total nitrogen management and control, as shown in Table 8.

[0056] Table 8 Total nitrogen emission reduction index of each region

[0057] Through the emission reduction analysis, it is found that Qinglong County and Lulong County have lower emission reduction index, which are the priority areas for key management.

[0058] Through intensive monitoring, Lulong County Yanhe is locked as a high value area of total nitrogen. Further carpet investigation in this area found individual illegal emissions.

[0059] The river total nitrogen source tracing quantitative analysis method provided by the application avoids the limitations of the method, calculates the total nitrogen input in the region by using the nitrogen input model, mainly uses environmental statistical data, supplemented by industry statistical data, scientifically calculates the total nitrogen emissions of the region and the river basin, and clearly defines the industry responsibility of emission reduction; for the current analysis method does not accurately analyze the total nitrogen emission reduction potential and key area analysis, the application calculates the total nitrogen emission source in the region by analyzing the river total nitrogen intensive monitoring data, environmental statistical data, industry statistical data, etc., comprehensively analyzes the urban sewage collection rate and treatment rate in the region, rural domestic sewage treatment rate, comprehensive utilization rate of livestock and poultry manure above scale, and other data, combined with the field investigation of industry management status and sewage treatment facility operation, etc. Scientifically researches the emission reduction potential of different industries, and clearly defines the department responsibility of emission reduction. At the same time, combined with satellite remote sensing technology and all-time space intensive monitoring data, the key river sections and key areas with high total nitrogen are identified, the hot grid of total nitrogen is clearly defined, and the key areas are locked, which provides important technical support for river total nitrogen management and control.

[0060] It should be noted that those skilled in the art will realize that the embodiments described herein are to help the reader understand the principles of the application and should be understood as the protection scope of the application is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspirations disclosed in the application without departing from the essence of the application, and these modifications and combinations are still within the protection scope of the application.

Claims

1. A quantitative analysis method for tracing the source and clarifying responsibility for total nitrogen in rivers, characterized in that, include: S1: Based on the main industries that affect the total nitrogen in the water environment during human activities, the sources of total nitrogen are divided, and the total nitrogen emissions from industrial sources, urban domestic sources, rural domestic sources, agricultural planting sources, livestock and poultry breeding sources and aquaculture sources are calculated separately to obtain the total nitrogen emissions in the study area; S2: Based on the total nitrogen emissions in the study area, the study area is divided into multiple sub-regions, and the emission reduction index of each sub-region is calculated to obtain the emission reduction potential of the sub-regions; S3: Based on the total nitrogen emissions and emission reduction potential of the study area, the main emission sources and the main industry responsibilities for total nitrogen treatment and control are obtained. The ratio of the total nitrogen concentration monitored at river monitoring points to the total nitrogen control target concentration is used as the treatment priority index. Based on the treatment optimization index, the areas that need to be given priority for treatment are obtained. S4: Based on the main emission sources, the responsibilities of major industries, and the areas requiring priority treatment, identify and investigate key areas, key river sections, and key industries where total nitrogen levels are rising, and determine the individual responsibilities for emission reduction.

2. The method for quantitative analysis of total nitrogen sources in rivers according to claim 1, characterized in that, S1 includes: S101: Calculate the total nitrogen emissions from industrial sources based on the wastewater discharge volume and total nitrogen concentration automatically monitored at the river discharge outlets. The calculation formula is as follows: In the formula, Total nitrogen emissions from industrial sources For the first Total nitrogen concentration at industrial wastewater discharge outlets into rivers, For the first Wastewater discharge from industrial outlets into rivers The number of industrial sewage outlets discharging into rivers; S102: Calculate the total nitrogen emissions from urban domestic sources based on the generation and removal of total nitrogen from domestic sewage in urban and county built-up areas. The calculation formula is as follows: In the formula, Total nitrogen emissions from urban domestic sources For permanent residents of urban areas, The pollution generation coefficient, The amount of water entering urban sewage treatment plants, The average total nitrogen concentration in the influent of urban domestic wastewater treatment plants. The average total nitrogen removal rate of urban domestic wastewater treatment plants; S103: Calculate the total nitrogen emissions from rural domestic sources based on the rural resident population and the collection and treatment of domestic sewage. The calculation formula is as follows: In the formula, This refers to the total nitrogen emissions from rural domestic sources. For rural permanent residents, The total nitrogen pollution coefficient, To improve the rural domestic sewage treatment rate, Total nitrogen removal rate; S104: Calculate the total nitrogen emissions from agricultural planting sources based on planting area, nitrogen fertilizer application rate, loss coefficient, etc. The calculation formula is as follows: In the formula, Total nitrogen emissions from agricultural planting sources For the first The planting area of ​​each plot of land, For the first Total nitrogen loss coefficient of each plot, To adjust the coefficient, The number of plots; S105: Calculate the total nitrogen emissions from livestock and poultry farming sources based on the scale of farming and pollution discharge coefficient. The calculation formula is as follows: In the formula, Total nitrogen emissions from livestock and poultry farming For the first The scale of livestock and poultry breeding, For the first Pollution coefficient of breeding livestock and poultry This refers to the number of livestock and poultry species. S106: Calculate the total nitrogen emissions from aquaculture sources based on production volume and pollution discharge coefficient. The calculation formula is as follows: In the formula, Total nitrogen emissions from aquaculture For the first The yield of aquatic products For the first Pollution coefficient of breeding livestock and poultry This refers to the number of livestock and poultry species. S107: Based on the total nitrogen emissions from industrial sources, urban residential sources, rural residential sources, agricultural planting sources, livestock and poultry breeding sources, and aquaculture sources, the total nitrogen emissions in the study area are calculated using the following formula: In the formula, The total nitrogen emissions in the study area.

3. The method for quantitative analysis of total nitrogen sources in rivers according to claim 1, characterized in that, The formula for calculating the emission reduction index is as follows: In the formula, To study the total nitrogen emission reduction index in the region, To improve the wastewater collection and treatment rate of industrial enterprises and industrial parks, For the collection and treatment rate of urban domestic sewage, To improve the collection and treatment rate of rural domestic sewage, This refers to the proportion of organic fertilizer in the total amount of fertilizer applied in the planting industry. To improve the collection and treatment rate of livestock and poultry manure, The treatment rate of wastewater from aquaculture.

4. The method for quantitative analysis of total nitrogen sources in rivers according to claim 3, characterized in that, The emission reduction potential includes: The lower the emission reduction index of the sub-region, the greater the emission reduction potential of the sub-region.

5. The method for quantitative analysis of total nitrogen sources in rivers according to claim 1, characterized in that, The areas requiring priority governance, identified based on the governance optimization index, include: The formula for calculating the governance priority index is as follows: In the formula, As a governance priority index, For monitoring total nitrogen concentration, The target concentration for total nitrogen control; When the governance priority index exceeds 1, the sub-area corresponding to the river monitoring point needs to be prioritized for governance; otherwise, the sub-area corresponding to the river monitoring point meets the control requirements.

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