Living source nitrogen pollution accounting and control method based on high-resolution substance flow analysis

Abstract

The invention provides a living source nitrogen pollution accounting and control method based on high-resolution material flow analysis, and relates to the technical field of nitrogen pollution treatment, and the method comprises the steps: obtaining the food source nitrogen excretion amount of urban and rural residents according to the food nitrogen content of the urban and rural residents, the urban and rural resident food source nitrogen excretion comprises urban resident food source nitrogen excretion and rural resident food source nitrogen excretion; according to the urban and rural resident food source nitrogen excretion amount, a food source nitrogen flow direction analysis result is obtained, and the food source nitrogen flow direction analysis result comprises the sewage tail end treatment nitrogen content; obtaining a nitrogen discharge flow direction analysis result through the nitrogen content of the tail end treatment of the sewage; and formulating a living source nitrogen pollution treatment regulation and control strategy aiming at the urban and rural resident domestic sewage according to the nitrogen discharge flow direction analysis result, and treating the urban and rural resident domestic sewage according to the living source nitrogen pollution treatment regulation and control strategy. According to the invention, accurate control of urban and rural residential water pollution is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of nitrogen pollution treatment, and in particular to a method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis. Background Art

[0002] With the popularization of environmental protection awareness, the treatment of domestic sewage in urban and rural residents has gradually received attention. By improving the efficiency and quality of sewage treatment, environmental pollution can be reduced and the ecological environment can be protected. Among them, nitrogen is a key nutrient element that promotes the growth of aquatic plants. The direct discharge of untreated nitrogen-containing sewage will lead to eutrophication of water bodies, affect the survival of aquatic organisms, and destroy the ecological balance of water bodies.

[0003] At present, the accounting and control of nitrogen pollution from domestic sources face a series of challenges. The primary problem is that the data resolution of existing accounting methods is low, making it difficult to accurately capture every subtle link of nitrogen from food intake, waste generation to sewage treatment, resulting in an insufficient understanding of the nitrogen pollution problem. Secondly, traditional methods often ignore the importance of reducing nitrogen intake from the source and fail to effectively control the intake of nitrogen in food, thereby increasing the burden on subsequent treatment links. Furthermore, there are inaccuracies in the evaluation of the treatment efficiency of sewage treatment facilities, and the differences between different facilities and treatment methods have not been fully considered, affecting the accurate evaluation of nitrogen removal efficiency. Finally, the existing methods are not comprehensive enough in the analysis of nitrogen destination, often only focusing on the nitrogen content in sewage, while ignoring other forms of nitrogen emissions such as ammonia (NH3), nitrous oxide (N2O) and sludge nitrogen, resulting in a lack of comprehensive evaluation of nitrogen pollution problems, which is difficult to meet the current needs of precise prevention and control of water environment pollution. Summary of the invention

[0004] The present invention aims to solve at least one of the above problems.

[0005] To solve the above problems, the present invention provides a method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis, comprising:

[0006] Obtaining the nitrogen excretion from food sources of urban and rural residents according to the nitrogen content of food of urban and rural residents, wherein the nitrogen excretion from food sources of urban and rural residents includes the nitrogen excretion from food sources of urban residents and the nitrogen excretion from food sources of rural residents;

[0007] Obtaining food source nitrogen flow analysis results according to the food source nitrogen excretion of urban and rural residents, wherein the food source nitrogen flow analysis results include the nitrogen content of sewage terminal treatment;

[0008] Obtaining nitrogen emission flow analysis results through the sewage terminal treatment nitrogen content;

[0009] A domestic nitrogen pollution control and regulation strategy for urban and rural residents' domestic sewage is formulated based on the nitrogen emission flow analysis results, and the urban and rural residents' domestic sewage is treated based on the domestic nitrogen pollution control and regulation strategy.

[0010] Optionally, obtaining the nitrogen excretion from food sources of urban and rural residents according to the nitrogen content of food of urban and rural residents comprises:

[0011] The nitrogen intake of urban and rural residents from food sources is obtained according to the nitrogen content of urban and rural residents' food, wherein the nitrogen intake of urban and rural residents from food sources is:

[0012]

[0013] Among them, HMIN Food is the nitrogen intake from food sources of urban and rural residents, i,Urb is the per capita consumption of food i by urban residents, Food i,Rur is the per capita consumption of the ith food among rural residents, P Urb is the number of permanent residents in the city, P Rur is the number of permanent rural residents, is the nitrogen content in the ith food;

[0014] The nitrogen excretion from food sources of urban and rural residents is obtained according to the nitrogen intake from food sources of urban and rural residents.

[0015] Optionally, obtaining the food source nitrogen flow analysis result according to the food source nitrogen excretion of urban and rural residents includes:

[0016] Inputting the nitrogen excretion from food sources of urban residents into the urban nitrogen flow analysis model to obtain the urban nitrogen flow ratio coefficient;

[0017] Obtaining an urban nitrogen flow analysis result according to the urban residents' food source nitrogen excretion and the urban nitrogen flow ratio coefficient;

[0018] Inputting the rural residents' food source nitrogen excretion into the rural nitrogen flow analysis model to obtain the rural nitrogen flow ratio coefficient;

[0019] Obtaining rural nitrogen flow analysis results according to the rural residents' food source nitrogen excretion and the rural nitrogen flow ratio coefficient;

[0020] The food source nitrogen flow analysis result is obtained through the urban nitrogen flow analysis result and the rural nitrogen flow analysis result.

[0021] Optionally, the food source nitrogen flow analysis results include the nitrogen content of urine and feces returned to the field, the nitrogen content of sewage terminal treatment and the nitrogen content of urine and feces directly discharged, wherein the nitrogen content of urine and feces returned to the field is:

[0022] HM mau,ht,j=R mau,ht,j ×HM mau,j ,

[0023] Among them, HM mau,ht,j is the nitrogen content of manure and urine returned to the field, R mau,ht,j HM is the urban nitrogen flow ratio coefficient of urban and rural residents’ manure and urine returned to farmland, mau,j The nitrogen excretion from food sources of urban and rural residents;

[0024] Among them, the nitrogen content of the sewage terminal treatment is:

[0025] HM WWT,j =HM mau,j ×R j,WWT ,

[0026] Among them, HM WWT,j HM is the nitrogen content of the wastewater at the end of treatment. mau,j is the nitrogen excretion from food sources of urban and rural residents, R j,WWT The urban nitrogen flow ratio coefficient for urban and rural excreta discharged into the sewage treatment system;

[0027] Wherein, the direct nitrogen content of feces and urine is:

[0028] HM mau,zp,i =HM mau,i -HM mau,ht,i -HM WWT,i ,

[0029] Among them, HM mau,zp,i It is the direct nitrogen content of feces and urine.

[0030] Optionally, the sewage terminal treatment nitrogen content includes urban sewage terminal treatment nitrogen content and rural sewage terminal treatment nitrogen content, the nitrogen emission flow direction analysis result includes urban nitrogen emission flow direction analysis result and rural nitrogen emission flow direction analysis result, and the nitrogen emission flow direction analysis result obtained by the sewage terminal treatment nitrogen content includes:

[0031] Inputting the nitrogen content of the urban sewage terminal treatment into the urban nitrogen emission analysis model to obtain the urban nitrogen emission ratio coefficient;

[0032] Obtaining the urban nitrogen emission flow direction analysis result according to the urban sewage terminal treatment nitrogen content and the urban nitrogen emission ratio coefficient;

[0033] Inputting the rural sewage terminal treatment nitrogen content into the rural nitrogen emission analysis model to obtain the rural nitrogen emission ratio coefficient;

[0034] The rural nitrogen emission flow analysis results are obtained based on the rural sewage terminal treatment nitrogen content and the rural nitrogen emission ratio coefficient.

[0035] Optionally, the nitrogen emission flow direction analysis result obtained by treating the nitrogen content at the end of the sewage includes:

[0036] The urban nitrogen emission flow analysis result is obtained by the nitrogen content of the urban sewage terminal treatment, wherein the urban nitrogen emission flow analysis result includes the primary treatment nitrogen emission, wherein the primary treatment nitrogen emission is:

[0037] HM PWWT,Urb =R PWWT,Urb ×HM WWT,Urb ,

[0038] Among them, HM PWWT,Urb is the nitrogen emission from the primary treatment, R PWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage that only receives primary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0039] Optionally, the urban nitrogen emission flow analysis result also includes secondary and tertiary treatment nitrogen emissions, wherein the secondary and tertiary treatment nitrogen emissions are:

[0040] HM SWWT,Urb =R SWWT,Urb ×HM WWT,Urb ,

[0041] Among them, HM SWWT,Urb is the nitrogen emission from the secondary and tertiary treatment, R SWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage receiving secondary and tertiary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0042] Optionally, the urban nitrogen emission flow analysis result also includes the nitrogen emission of the urban sewage treatment device, wherein the nitrogen emission of the urban sewage treatment device is:

[0043] HM WWTF,Urb =R WWTF,Urb ×HM WWT,Urb ,

[0044] Among them, HM WWTF,Urb is the nitrogen emission of the urban sewage treatment plant, R WWTF,Urb HM is the nitrogen emission ratio coefficient of the urban residents’ domestic sewage treated by the sewage treatment plant, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0045] Optionally, the nitrogen emission flow direction analysis result obtained by treating the nitrogen content at the end of the sewage includes:

[0046] The rural nitrogen emission flow analysis result is obtained by the rural sewage terminal treatment nitrogen content, wherein the rural nitrogen emission flow analysis result includes the nitrogen emission of the sewage treatment plant and the nitrogen emission of the rural sewage treatment device;

[0047] Among them, the nitrogen emissions from the sewage treatment plant are:

[0048] HM WWTP,Rur =R PWWT,Rur ×HM WWT,Rur ,

[0049] Among them, HM WWTP,Rur is the nitrogen emission of the sewage treatment plant, R PWWT,Rur HM is the rural nitrogen emission ratio coefficient of rural residents’ domestic sewage entering the sewage treatment plant, WWT,Rur The nitrogen content of the rural sewage terminal treatment;

[0050] Among them, the nitrogen emissions of the rural sewage treatment device are:

[0051] HM WWTF,Rur =R WWTF,Rur ×HM WWT,Rur ,

[0052] Among them, HM WWTF,Rur is the nitrogen emission of the rural sewage treatment plant, R WWTF,Rur HM is the nitrogen emission ratio coefficient of rural residents’ domestic sewage treated by sewage treatment facilities, WWT,Rur The nitrogen content of the rural sewage terminal treatment.

[0053] Optionally, formulating a control strategy for nitrogen pollution control from domestic sewage of urban and rural residents based on the nitrogen emission flow analysis results includes:

[0054] Obtaining the total amount of unremoved nitrogen according to the nitrogen emission flow analysis result;

[0055] The nitrogen removal rate is obtained by the total amount of unremoved nitrogen, wherein the nitrogen removal rate is:

[0056]

[0057] Wherein, Nr is the total amount of unremoved nitrogen, NRE is the nitrogen removal rate of food source nitrogen in the whole process of sewage treatment, HM mau The nitrogen excretion from food sources of urban and rural residents;

[0058] A control strategy for the management of domestic nitrogen pollution from urban and rural domestic sewage is formulated based on the nitrogen emission flow analysis results and the nitrogen removal rate.

[0059] The beneficial effect of the method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis of the present invention is as follows: In this embodiment, the nitrogen excretion from the food sources of urban and rural residents is obtained by the nitrogen content of the food of urban and rural residents, and the data such as food are associated with the nitrogen content, so as to obtain the nitrogen excretion from the food sources of urban and rural residents. The nitrogen excretion from the food sources of urban and rural residents includes the nitrogen excretion from the food sources of urban residents and the nitrogen excretion from the food sources of rural residents. By considering the differences between urban and rural residents, they are analyzed separately to make the final result more in line with the actual situation. The food source nitrogen flow direction analysis result is obtained according to the nitrogen excretion from the food sources of urban and rural residents, and the nitrogen flow direction of each link of urban and rural sewage treatment is determined. The nitrogen emission flow direction analysis result is obtained by the nitrogen content of the sewage terminal treatment, and the nitrogen emission flow direction analysis result is formulated for the nitrogen pollution control and regulation strategy of the living source of urban and rural residents' domestic sewage. According to the nitrogen pollution control and regulation strategy for the living source, the domestic sewage of urban and rural residents is treated, for example, the nitrogen intake of residents at the source is reduced in a targeted manner, the sewage treatment rate is increased, the nitrogen removal efficiency of the existing treatment facilities is increased, and the nitrogen control effect of sewage in urban and rural areas is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic flow chart of a method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to an embodiment of the present invention;

[0061] Figure 2 The present invention is a flowchart of another method for calculating and controlling nitrogen pollution from domestic sources based on high-resolution material flow analysis according to an embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0063] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0064] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0065] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0066] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0067] In the relevant technologies, nitrogen is the main pollutant of domestic sewage and an important water quality indicator in the treatment process. High nitrogen concentrations have led to severe challenges in sewage treatment cost control, watershed ecological health protection, and stable water environment quality of receiving water bodies. With the continuous improvement of residents' living standards, the dietary structure of urban and rural residents has continued to upgrade, which is specifically manifested in the gradual change from a dietary structure centered on grains and vegetables to a dietary structure centered on meat, eggs, and milk. Although the upgrading of dietary structure has met the basic energy needs and the growing diversified needs, the nitrogen content in foods such as meat, eggs, and milk is much higher than that in foods such as grains and vegetables, so the food source nitrogen intake of urban and rural residents has increased significantly. Most of the food source nitrogen intake of residents enters domestic sewage in the form of feces and has become the main cause of the annual increase in nitrogen content in domestic sewage. Therefore, it is particularly important to accurately analyze the input and output process and morphological transformation mechanism of food source nitrogen of urban and rural residents in the whole chain of domestic sewage collection, treatment, and discharge, so as to formulate precise prevention and control measures for food source nitrogen pollution according to local conditions.

[0068] The current method for analyzing food-source nitrogen flow in domestic sewage does not analyze the nitrogen flow direction, nitrogen emission and nitrogen transformation in each step and module of the entire process of collection, treatment and discharge of urban and rural domestic sewage. It is limited to rough input and output calculations, which is not detailed and specific enough to meet the current needs of precise prevention and control of water pollution. At the same time, the ambiguity of nitrogen flow analysis in each link of sewage treatment is not conducive to the procedural calculation. Therefore, quantitatively describing the flow and transformation rules of food-source nitrogen in each link of sewage treatment through formulas has become the key to sewage treatment.

[0069] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a method for calculating and controlling nitrogen pollution from domestic sources based on high-resolution material flow analysis.

[0070] like Figure 1 As shown, an embodiment of the present invention provides a method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis, comprising:

[0071] Step 110, obtaining the nitrogen excretion from food sources of urban and rural residents according to the nitrogen content of food of urban and rural residents, wherein the nitrogen excretion from food sources of urban and rural residents includes the nitrogen excretion from food sources of urban residents and the nitrogen excretion from food sources of rural residents.

[0072] Specifically, the nitrogen content of food for urban and rural residents includes the per capita consumption of the ith food of urban residents, the per capita consumption of the ith food of rural residents, the number of permanent urban residents, the number of permanent rural residents and the N content of the ith food.

[0073] Step 120, obtaining a food source nitrogen flow analysis result based on the food source nitrogen excretion of urban and rural residents, wherein the food source nitrogen flow analysis result includes the nitrogen content of the sewage terminal treatment.

[0074] Specifically, the food-source nitrogen flow analysis results define the food-source nitrogen in urban and rural domestic sewage as the nitrogen contained in feces and urine excretion, and its main flows are returning feces and urine to the fields, terminal treatment of domestic sewage, and direct discharge of feces and urine. Due to differences in economic and development levels, terminal centralized treatment is the main method in cities, while returning feces and urine to the fields and direct discharge of feces and urine are the main methods in rural areas.

[0075] Step 130, obtaining a nitrogen emission flow analysis result by analyzing the nitrogen content of the wastewater terminal treatment.

[0076] Specifically, the treatment process of urban domestic sewage is generally more complicated, so it is divided into primary treatment, secondary and tertiary treatment and sewage treatment plant treatment. Rural sewage treatment facilities are relatively simple and small in scale, so they are divided into sewage plant treatment and sewage treatment plant treatment. Among them, the nitrogen emission coefficient of each link of urban sewage treatment plant is consistent with that of rural sewage treatment plant.

[0077] Step 140, formulate a domestic nitrogen pollution control and regulation strategy for urban and rural domestic sewage based on the nitrogen emission flow analysis results, and treat the urban and rural domestic sewage based on the domestic nitrogen pollution control and regulation strategy.

[0078] Specifically, the total amount of nitrogen not removed is obtained based on the analysis results of the nitrogen emission flow, and the nitrogen removal rate is obtained based on the total amount of nitrogen not removed. According to the analysis results of the nitrogen emission flow, targeted control strategies are formulated for different regions, including reducing source nitrogen intake, increasing the treatment rate of domestic source nitrogen, and increasing the nitrogen removal efficiency of existing treatment facilities, so as to effectively improve the control effect of domestic source nitrogen and reduce nitrogen compound emissions in the environment.

[0079] In this embodiment, the nitrogen excretion of urban and rural residents from food sources is obtained by the nitrogen content of urban and rural residents' food, and the data such as food are associated with the nitrogen content to obtain the nitrogen excretion of urban and rural residents from food sources. The nitrogen excretion of urban and rural residents from food sources includes the nitrogen excretion of urban residents from food sources and the nitrogen excretion of rural residents from food sources. Taking into account the differences between urban and rural residents, they are analyzed separately to make the final result more in line with the actual situation. According to the nitrogen excretion of urban and rural residents from food sources, the food source nitrogen flow analysis results are obtained to determine the nitrogen flow direction of each link in urban and rural sewage treatment. The nitrogen emission flow analysis results are obtained by the nitrogen content of the sewage terminal treatment, and the control strategy for the management of nitrogen pollution from living sources of urban and rural residents is formulated according to the nitrogen emission flow analysis results. According to the control strategy for the management of nitrogen pollution from living sources, the domestic sewage of urban and rural residents is treated, such as targeted reduction of nitrogen intake from the source of residents, improvement of sewage treatment rate, improvement of nitrogen removal efficiency of existing treatment facilities, and improvement of nitrogen management effect of sewage in urban and rural areas.

[0080] Optionally, obtaining the nitrogen excretion from food sources of urban and rural residents according to the nitrogen content of food of urban and rural residents comprises:

[0081] The nitrogen intake of urban and rural residents from food sources is obtained according to the nitrogen content of urban and rural residents' food, wherein the nitrogen intake of urban and rural residents from food sources is:

[0082]

[0083] Among them, HMIN Food is the nitrogen intake from food sources of urban and rural residents, i,Urb is the per capita consumption of food i by urban residents, Food i,Rur is the per capita consumption of the ith food among rural residents, P Urb is the number of permanent residents in the city, P Rur is the number of permanent rural residents, is the nitrogen content in the ith food;

[0084] The nitrogen excretion from food sources of urban and rural residents is obtained according to the nitrogen intake from food sources of urban and rural residents.

[0085] Specifically, human activity data can be converted into food-source nitrogen intake data based on urban and rural per capita food consumption, food nitrogen content, and population. The feces and urine excretion of urban and rural residents is used as food-source nitrogen input, which is calculated by multiplying the corresponding excretion ratio coefficient by the food-source nitrogen intake. The feces and urine excretion of food-source nitrogen by urban and rural residents is:

[0086] HM mau,j =R mau ×HMIN Food,j ,

[0087] Among them, HM mau,j R is the nitrogen excretion from food sources of urban and rural residents, which is used to indicate the nitrogen excretion from food sources of urban or rural residents in the form of feces and urine. mau HMIN is the ratio of per capita fecal nitrogen excretion in food sources of urban and rural residents. Food,j It is the amount of nitrogen excreted from food sources of urban or rural residents.

[0088] Other nitrogen losses from human metabolism are:

[0089] HMOUT Other =HMIN Food ×R Other ,

[0090] Among them, HMOUT Other HMIN is the amount of other nitrogen loss output from human metabolism. This part of nitrogen is not included in the nitrogen input from food sources of urban and rural residents’ domestic sewage. Food is the nitrogen excretion from food sources of urban and rural residents, R Other This is the proportion of other nitrogen losses in human metabolism. 7% is metabolized out of the body in the form of sweat, burping and farting, 2% is absorbed by the body, and the specific form and destination of the remaining 3% of nitrogen are still unclear.

[0091] Optionally, obtaining the food source nitrogen flow analysis result according to the food source nitrogen excretion of urban and rural residents includes:

[0092] Inputting the nitrogen excretion from food sources of urban residents into the urban nitrogen flow analysis model to obtain the urban nitrogen flow ratio coefficient;

[0093] Obtaining an urban nitrogen flow analysis result according to the urban residents' food source nitrogen excretion and the urban nitrogen flow ratio coefficient;

[0094] Inputting the rural residents' food source nitrogen excretion into the rural nitrogen flow analysis model to obtain the rural nitrogen flow ratio coefficient;

[0095] Obtaining rural nitrogen flow analysis results according to the rural residents' food source nitrogen excretion and the rural nitrogen flow ratio coefficient;

[0096] The food source nitrogen flow analysis result is obtained through the urban nitrogen flow analysis result and the rural nitrogen flow analysis result.

[0097] Optionally, the food source nitrogen flow analysis results include the nitrogen content of urine and feces returned to the field, the nitrogen content of sewage terminal treatment and the nitrogen content of urine and feces directly discharged, wherein the nitrogen content of urine and feces returned to the field is:

[0098] HM mau,ht,j =R mau,ht,j ×HM mau,j ,

[0099] Among them, HM mau,ht,j is the nitrogen content of manure and urine returned to the field, R mau,ht,j HM is the urban nitrogen flow ratio coefficient of urban and rural residents’ manure and urine returned to farmland, mau,j The nitrogen excretion from food sources of urban and rural residents;

[0100] Among them, the nitrogen content of the sewage terminal treatment is:

[0101] HM WWT,j =HM mau,j ×R j,WWT ,

[0102] Among them, HM WWT,j HM is the nitrogen content of the wastewater at the end of treatment. mau,j is the nitrogen excretion from food sources of urban and rural residents, R j,WWT The urban nitrogen flow ratio coefficient for urban and rural excreta discharged into the sewage treatment system;

[0103] Wherein, the direct nitrogen content of feces and urine is:

[0104] HM mau,zp,i =HM mau,i -HM mau,ht,i -HM WWT,i ,

[0105] Among them, HM mau,zp,i It is the direct nitrogen content of feces and urine.

[0106] Specifically, the urban nitrogen flow analysis model and the rural nitrogen flow analysis model are used to represent the pre-trained neural network model. The urban nitrogen flow analysis model is used to analyze the nitrogen flow of urban food sources, and the urban feces and urine return to the field nitrogen content ratio coefficient, the urban sewage terminal treatment nitrogen content ratio coefficient and the urban feces and urine direct discharge nitrogen content ratio coefficient are obtained. The rural nitrogen flow analysis model is used to analyze the nitrogen flow of rural food sources, and the rural feces and urine return to the field nitrogen content ratio coefficient, the rural sewage terminal treatment nitrogen content ratio coefficient and the rural feces and urine direct discharge nitrogen content ratio coefficient are obtained. Among them, the neural network model is a computational model that simulates the connection of neurons in the human brain, which is used to process complex input data and perform tasks such as classification, regression, image processing and natural language processing.

[0107] The construction process of the urban nitrogen flow analysis model includes:

[0108] Obtain the historical nitrogen excretion from food sources of urban residents and the historical urban nitrogen flow ratio coefficient;

[0109] The training model is obtained by training the initial neural network model through urban population data, dietary consumption and nutritional composition data, comprehensive operation data of urban sewage treatment facilities, the historical nitrogen excretion from food sources of urban residents and the historical nitrogen flow ratio coefficient of the urban area;

[0110] When the training model meets the model accuracy requirement, the urban nitrogen flow analysis model is obtained.

[0111] In some more specific embodiments, the nitrogen content ratio coefficient of urban excrement returned to the field is 0%, the nitrogen content ratio coefficient of urban sewage terminal treatment is 64%, and the nitrogen content ratio coefficient of urban excrement direct discharge is 36%. The nitrogen content ratio coefficient of rural excrement returned to the field is 20%, the nitrogen content ratio coefficient of rural sewage terminal treatment is 1%, and the nitrogen content ratio coefficient of rural excrement direct discharge is 79%.

[0112] In this optional embodiment, by using a neural network model to obtain the nitrogen flow proportional coefficient, features can be automatically learned from the data without manual feature extraction. With sufficient training data, the data obtained by the neural network model is more accurate.

[0113] Optionally, the sewage terminal treatment nitrogen content includes urban sewage terminal treatment nitrogen content and rural sewage terminal treatment nitrogen content, the nitrogen emission flow direction analysis result includes urban nitrogen emission flow direction analysis result and rural nitrogen emission flow direction analysis result, and the nitrogen emission flow direction analysis result obtained by the sewage terminal treatment nitrogen content includes:

[0114] Inputting the nitrogen content of the urban sewage terminal treatment into the urban nitrogen emission analysis model to obtain the urban nitrogen emission ratio coefficient;

[0115] Obtaining the urban nitrogen emission flow direction analysis result according to the urban sewage terminal treatment nitrogen content and the urban nitrogen emission ratio coefficient;

[0116] Inputting the rural sewage terminal treatment nitrogen content into the rural nitrogen emission analysis model to obtain the rural nitrogen emission ratio coefficient;

[0117] The rural nitrogen emission flow analysis results are obtained based on the rural sewage terminal treatment nitrogen content and the rural nitrogen emission ratio coefficient.

[0118] Specifically, the urban nitrogen emission ratio coefficient includes the primary treatment nitrogen emission ratio coefficient, the secondary and tertiary treatment nitrogen emission ratio coefficient and the urban sewage treatment device nitrogen emission ratio coefficient. The rural nitrogen emission ratio coefficient includes the sewage treatment plant nitrogen emission ratio coefficient and the rural sewage treatment device nitrogen emission ratio coefficient. Both the urban nitrogen emission analysis model and the rural nitrogen emission analysis model are pre-trained neural network models.

[0119] Optionally, the nitrogen emission flow direction analysis result obtained by treating the nitrogen content at the end of the sewage includes:

[0120] The urban nitrogen emission flow analysis result is obtained by the nitrogen content of the urban sewage terminal treatment, wherein the urban nitrogen emission flow analysis result includes the primary treatment nitrogen emission, wherein the primary treatment nitrogen emission is:

[0121] HM PWWT,Urb =R PWWT,Urb ×HM WWT,Urb ,

[0122] Among them, HM PWWT,Urb is the nitrogen emission from the primary treatment, R PWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage that only receives primary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0123] Optionally, the urban nitrogen emission flow analysis result also includes secondary and tertiary treatment nitrogen emissions, wherein the secondary and tertiary treatment nitrogen emissions are:

[0124] HM SWWT,Urb =R SWWT,Urb ×HM WWT,Urb ,

[0125] Among them, HM SWWT,Urb is the nitrogen emission from the secondary and tertiary treatment, R SWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage receiving secondary and tertiary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0126] Optionally, the urban nitrogen emission flow analysis result also includes the nitrogen emission of the urban sewage treatment device, wherein the nitrogen emission of the urban sewage treatment device is:

[0127] HM WWTF,Urb =R WWTF,Urb ×HM WWT,Urb ,

[0128] Among them, HM WWTF,Urb is the nitrogen emission of the urban sewage treatment plant, R WWTF,Urb HM is the nitrogen emission ratio coefficient of the urban residents’ domestic sewage treated by the sewage treatment plant, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

[0129] Specifically, the primary treatment nitrogen emission is used to indicate the food source nitrogen content in urban domestic sewage that has only received primary treatment. The secondary and tertiary treatment nitrogen emission is used to indicate the total amount of food source nitrogen in urban domestic sewage that has received secondary treatment. The urban sewage treatment plant nitrogen emission is used to indicate the total amount of food source nitrogen in urban domestic sewage treated by the sewage treatment plant. The sewage treatment plant nitrogen emission is used to indicate the food source nitrogen content in rural domestic sewage that enters the sewage treatment plant. The rural sewage treatment plant nitrogen emission is used to indicate the total amount of food source nitrogen in urban domestic sewage treated by the sewage treatment plant.

[0130] Optionally, the nitrogen emission flow direction analysis result obtained by treating the nitrogen content at the end of the sewage includes:

[0131] The rural nitrogen emission flow analysis result is obtained by the rural sewage terminal treatment nitrogen content, wherein the rural nitrogen emission flow analysis result includes the nitrogen emission of the sewage treatment plant and the nitrogen emission of the rural sewage treatment device;

[0132] Among them, the nitrogen emissions from the sewage treatment plant are:

[0133] HM WWTP,Rur =R PWWT,Rur ×HM WWT,Rur ,

[0134] Among them, HM WWTP,Rur is the nitrogen emission of the sewage treatment plant, R PWWT,Rur HM is the rural nitrogen emission ratio coefficient of rural residents’ domestic sewage entering the sewage treatment plant, WWT,Rur The nitrogen content of the rural sewage terminal treatment;

[0135] Among them, the nitrogen emissions of the rural sewage treatment device are:

[0136] HM WWTF,Rur =R WWTF,Rur×HM WWT,Rur ,

[0137] Among them, HM WWTF,Rur is the nitrogen emission of the rural sewage treatment plant, R WWTF,Rur HM is the nitrogen emission ratio coefficient of rural residents’ domestic sewage treated by sewage treatment facilities, WWT,Rur The nitrogen content of the rural sewage terminal treatment.

[0138] In this optional embodiment, since the treatment process of urban domestic sewage is generally more complicated, it is divided into primary treatment, secondary and tertiary treatment and sewage treatment device treatment at the sewage plant. However, rural sewage treatment facilities are relatively simple and small in scale, so they are divided into sewage plant treatment and sewage device treatment, which is more in line with the actual situation.

[0139] Optionally, formulating a control strategy for nitrogen pollution control from domestic sewage of urban and rural residents based on the nitrogen emission flow analysis results includes:

[0140] Obtaining the total amount of unremoved nitrogen according to the nitrogen emission flow analysis result;

[0141] The nitrogen removal rate is obtained by the total amount of unremoved nitrogen, wherein the nitrogen removal rate is:

[0142]

[0143] Wherein, Nr is the total amount of unremoved nitrogen, NRE is the nitrogen removal rate of food source nitrogen in the whole process of sewage treatment, HM mau The nitrogen excretion from food sources of urban and rural residents;

[0144] A control strategy for the management of domestic nitrogen pollution from urban and rural domestic sewage is formulated based on the nitrogen emission flow analysis results and the nitrogen removal rate.

[0145] Specifically, the nitrogen emissions from the primary treatment include primary sludge nitrogen, NH3 emissions, and nitrogen emissions into the river / secondary nitrogen emissions. The nitrogen emissions from the secondary and tertiary treatments include secondary sludge nitrogen, N2O emissions, nitrogen emissions into the river, and N2 emissions. The nitrogen emissions from the urban sewage treatment plant include secondary sludge nitrogen, N2O emissions, nitrogen emissions into the river, N2 emissions, and NH3 emissions. The nitrogen emissions from the sewage treatment plant include secondary sludge nitrogen, N2O emissions, nitrogen emissions into the river, N2 emissions, and NH3 emissions. The nitrogen emissions from the rural sewage treatment plant include secondary sludge nitrogen, N2O emissions, nitrogen emissions into the river, N2 emissions, and NH3 emissions.

[0146] The nitrogen emission from the primary treatment is:

[0147] WPTN Sludge,Urb=WPTN Sludge,Urb,R ×HM PWWT,Urb ,

[0148] Among them, WPTN Sludge,Urb WPTN is the total nitrogen content of primary sludge containing food-derived nitrogen in primary treatment of urban domestic sewage. Sludge,Urb,R HM is the ratio of nitrogen content in primary sludge to food-derived nitrogen in primary treated domestic sewage. PWWT,Urb It is the food source nitrogen content in urban domestic sewage that receives primary treatment.

[0149] WPTN NH3,Urb =WPTN NH3,Urb,R ×HM PWWT,Urb ,

[0150] Among them, WPTN NH3,Urb It is the NH3 emission in the primary treatment of urban domestic sewage.

[0151] WPTN River,Urb =WPTN River,Urb,R ×HM PWWT,Urb ,

[0152] Among them, WPTN River,Urb WPTN is the amount of food-derived nitrogen entering the river / secondary nitrogen discharged from primary treatment of urban domestic sewage. River,Urb,R It is the nitrogen emission coefficient into the river / secondary nitrogen emission coefficient of primary treatment of urban domestic sewage.

[0153] The nitrogen emissions from the secondary and tertiary treatments are:

[0154] WSTN Sludge,Urb =WSTN Sludge,Urb,R ×HM SWWT,Urb ,

[0155] Among them, WFTN Sludge,Urb WSTN is the total nitrogen content of secondary sludge containing food-derived nitrogen in the secondary and tertiary treatment of urban domestic sewage. Sludge,Urb,R HM is the ratio of nitrogen content in secondary sedimentation sludge to food-derived nitrogen in secondary and tertiary treated domestic sewage in urban domestic sewage. SWWT,Urb It is the total amount of food-derived nitrogen in urban domestic sewage that receives secondary and tertiary treatment.

[0156] WSTN N2O,Urb =WSTN N2O,Urb,R ×HM SWWT,Urb ,

[0157] Among them, WSTN N2O,Urb WSTN is the N2O emission from food-derived nitrogen in the secondary and tertiary treatment of urban domestic sewage. N2O,Urb,RIt is the N2O emission coefficient of secondary and tertiary treatment of urban domestic sewage.

[0158] WSTN River,Urb =WSTN River,Urb,R ×HM SWWT,Urb ,

[0159] Among them, WSTN River,Urb WSTN is the amount of food-derived nitrogen entering the river / secondary nitrogen discharged from the secondary and tertiary treatment of urban domestic sewage. River,Urb,R It is the nitrogen emission coefficient into the river / secondary nitrogen emission coefficient of secondary and tertiary treatment of urban domestic sewage.

[0160] WSTN N2,Urb =WSTN N2,Urb,R ×HM SWWT,Urb ,

[0161] Among them, WSTN N2,Urb WSTN is the N2 emission from food-derived nitrogen in the secondary and tertiary treatment of urban domestic sewage. N2,Urb,R It is the N2 emission coefficient of secondary and tertiary treatment of urban domestic sewage.

[0162] The nitrogen emissions from the urban sewage treatment plant are:

[0163] WFTN Sludge,Urb =WFTN Sludge,R ×HM WWTF,Urb ,

[0164] Among them, WFTN Sludge,Urb WFTN is the total nitrogen content of secondary sludge containing food-derived nitrogen in urban domestic sewage treated by sewage treatment plants. Sludge,R HM is the ratio of nitrogen content in secondary sedimentation sludge to food-derived nitrogen in domestic sewage treated by sewage treatment plants / rural sewage treatment plants. WWTF,Urb It is the total amount of food source nitrogen in urban domestic sewage treated by sewage treatment plants.

[0165] WFTN N2O,Urb =WFTN N2O,R ×HM WWTF,Urb ,

[0166] Among them, WFTN N2O,Urb WFTN is the N2O emission of food-derived nitrogen from urban domestic sewage treated by sewage treatment plants. N2O,R is the N2O emission factor of food-derived nitrogen in domestic sewage treated by sewage plants / rural sewage treatment plants.

[0167] WFTN River,Urb =WFTN River,R ×HM WWTF,Urb ,

[0168] Among them, WFTN River,Urb WFTN is the total amount of food source nitrogen entering the river from urban domestic sewage treated by sewage treatment plants. River,R It is the nitrogen / secondary nitrogen emission coefficient into the river from the urban sewage treatment plant.

[0169] WFTN N2,Urb =WFTN N2,R ×HM WWTF,Urb ,

[0170] Among them, WFTN N2,Urb WFTN is the N2 emission of food-derived nitrogen from urban domestic sewage treated by sewage treatment plants. N2,R is the N2 emission coefficient of domestic sewage treated by the sewage treatment plant / rural sewage plant.

[0171] WFTN NH3,Urb =WFTN NH3,R ×HM WWTF,Urb ,

[0172] Among them, WFTN NH3,Urb WFTN is the NH3 emission of food-derived nitrogen from urban domestic sewage treated by sewage treatment plants. NH3,R is the NH3 emission coefficient of domestic sewage treated by the sewage treatment plant / rural sewage plant.

[0173] The nitrogen emissions from the sewage treatment plant are:

[0174] WRT Sludge,Rur =WFTN Sludge,R ×HM WWTP,Rur ,

[0175] Among them, WRTN Sludge,Rur WFTN is the total nitrogen content of secondary sludge containing food source nitrogen from domestic sewage treated by rural sewage treatment plants. Sludge,R HM is the ratio of nitrogen content in secondary sedimentation sludge to food-derived nitrogen in domestic sewage treated by sewage treatment plants / rural sewage treatment plants. WWTP,Rur It is the food source nitrogen content in the domestic sewage of rural residents entering the sewage treatment plant.

[0176] WRT N2O,Rur =WFTN N2O,R ×HM WWTP,Rur ,

[0177] Among them, WRTN N2O,Rur N2O emissions from food-derived nitrogen in domestic sewage treated by rural sewage treatment plants, WFTN N2O,R is the N2O emission factor of food-derived nitrogen in domestic sewage treated by sewage plants / rural sewage treatment plants.

[0178] WRTRiver,Rur =WFTN River,R ×HM WWTP,Urb ,

[0179] Among them, WRTN River,Rur The amount of nitrogen discharged into rivers treated by rural sewage treatment plants.

[0180] WRT N2,Rur =WFTN N2,R ×HM WWTP,Rur ,

[0181] Among them, WRTN N2,Rur N2 emissions from food-derived nitrogen in domestic sewage treated by rural sewage treatment plants, WFTN N2,R is the N2 emission coefficient of domestic sewage treated by sewage treatment plant / rural sewage treatment plant, HM WWTP,Rur It is the food source nitrogen content in the domestic sewage of rural residents entering the sewage treatment plant.

[0182] WRT NH3,Rur =WFTN NH3,R ×HM WWTP,Rur ,

[0183] Among them, WRTN NH3,Rur NH3 emissions from food-derived nitrogen in domestic sewage treated by rural sewage treatment plants, WFTN NH3,R is the NH3 emission coefficient of domestic sewage treated by the sewage treatment plant / rural sewage plant.

[0184] The nitrogen emissions from the rural sewage treatment plant are:

[0185] WFTN Sludge,Rur =WFTNR Sludge,R ×HM WWTF,Rur ,

[0186] Among them, WFTN Sludge,Rur WFTNR is the total nitrogen content of secondary sludge containing food-derived nitrogen in rural domestic sewage treated by sewage treatment plants. Sludge,R HM is the ratio of nitrogen content in secondary sedimentation sludge to food-derived nitrogen in domestic sewage treated by rural sewage treatment plants. WWTF,Rur It is the total amount of food source nitrogen in domestic sewage treated by rural sewage treatment plants.

[0187] WFTN N2O,Rur =WFTNR N2O,R ×HM WWTF,Rur ,

[0188] Among them, WFTN N2O,Rur WFTNR is the N2O emission of food-derived nitrogen from rural domestic sewage treated by sewage treatment plants.N2O,R is the N2O emission factor of food-derived nitrogen in domestic sewage treated by sewage plants / rural sewage treatment plants.

[0189] WFTN River,Rur =WFTNR River,R ×HM WWTF,Rur ,

[0190] Among them, WFTN River,Rur WFTNR is the total amount of food source nitrogen entering the river from rural domestic sewage treated by sewage treatment plants. River,R It is the nitrogen / secondary nitrogen emission coefficient into the river from rural sewage treatment facilities.

[0191] WFTN N2,Rur =WFTNR N2,R ×HM WWTF,Rur ,

[0192] Among them, WFTN N2,Urb WFTNR is the N2 emission from food-derived nitrogen in rural domestic sewage treated by sewage treatment plants. N2,R is the N2 emission coefficient of domestic sewage treated by rural sewage treatment plants.

[0193] WFTN NH3,Rur =WFTNR NH3,R ×HM WWTF,Rur ,

[0194] Among them, WRTN NH3,Rur WFTNR is the NH3 emission of food-derived nitrogen from rural domestic sewage treated by sewage treatment plants. NH3,R is the NH3 emission coefficient of domestic sewage treated by rural sewage treatment plants.

[0195] In some more specific embodiments, the nitrogen emission analysis of food sources from returning manure and urine to fields in urban and rural areas is:

[0196] WMTN N2O,j =WMTNR N2O,j ×HM mau,ht,j ,

[0197] Among them, WMTN N2O,j is the N2O emission from returning manure to farmland in urban and rural areas, WMTNR N2O,j is the N2O emission coefficient from returning manure and urine to the fields.

[0198] WMTN N2,j =WMTNR N2,j ×HM mau,ht,j ,

[0199] Among them, WMTN N2,j is the N2 emission from returning manure to farmland in urban and rural areas, WMTNRN2,j is the N2 emission coefficient of returning manure and urine to the fields.

[0200] WMTN NH3,j =WMTNR NH3,j ×HM mau,ht,j ,

[0201] Among them, WMTN NH3,j is the NH3 emission from returning manure to farmland in urban and rural areas, WMTNR NH3,j is the NH3 emission coefficient of returning manure and urine to the fields.

[0202] WMTN NO,j =WMTNR NO,j ×HM mau,ht,j ,

[0203] Among them, WMTN NO,j is the NO emission from returning manure to farmland in urban and rural areas, WMTNR NO,j is the NO emission coefficient of returning manure and urine to the field.

[0204] WMTN Run,j =WMTNR Run,j ×HM mau,ht,j ,

[0205] Among them, WMTN Run,j WMTNR is the nitrogen runoff loss from returning manure to fields in urban and rural areas. Run,j is the runoff loss coefficient of returning manure and urine to the fields.

[0206] WMTN lea,j =WMTNR lea,j ×HM mau,ht,j ,

[0207] Among them, WMTN lea,j WMTNR is the nitrogen leaching loss from returning manure to fields in urban and rural areas. lea,j ——Leaching loss coefficient of returning manure and urine to the fields.

[0208] WMTN absorb,j =WMTNR absorb,j ×HM mau,ht,j ,

[0209] Among them, WMTN absorb,j WMTNR is the nitrogen crop absorption from manure and urine returned to fields in urban and rural areas. absorb,j is the nitrogen absorption coefficient of crops when manure and urine are returned to the fields.

[0210] The emission of different forms of nitrogen from food sources in urban and rural domestic sewage was analyzed. The total amount of nitrogen from different forms of nitrogen from food sources was obtained by adding up the nitrogen emissions from each link of urban and rural sewage treatment.

[0211] The N2O emission of food-source nitrogen in the whole process of domestic sewage treatment is:

[0212]

[0213] in, is the N2O emission during sewage treatment.

[0214] The NH3 emission of food-source nitrogen in the whole process of domestic sewage treatment is:

[0215]

[0216] in, is the NH3 emission in the sewage treatment process.

[0217] The total amount of nitrogen in the sludge of domestic sewage treatment food source nitrogen is calculated as:

[0218] WTOUT Sludge =WPTN Sludge,Urb +WSTN Sludge,Urb +WFTN Sludge,Urb +WRTN Sludge,Rur +WFTN Sludge,Rur ,

[0219] Among them, WTOUT Sludge WPTN is the total amount of nitrogen in the sludge after sewage treatment, which is the food source nitrogen. Sludge,Urb WFTN is the total nitrogen content of primary sludge containing food-derived nitrogen in primary treatment of urban domestic sewage. Sludge,Urb WFTN is the total nitrogen content of secondary sludge containing food-derived nitrogen in the secondary and tertiary treatment of urban domestic sewage. Sludge,Urb WRTN is the total nitrogen content of secondary sludge containing food-derived nitrogen in urban domestic sewage treated by sewage treatment plants. Sludge,Rur WFTN is the total nitrogen content of secondary sludge containing food source nitrogen from domestic sewage treated by rural sewage treatment plants. Sludge,Rur The total nitrogen content of secondary sludge containing food source nitrogen in rural domestic sewage treated by sewage treatment plants.

[0220] The total amount of nitrogen discharged into the river after domestic sewage treatment is calculated as:

[0221] WTOUT Food,River =WPTN River,Urb +WSTN River,Urb +WFTN River,Urb +WRTN River,Rur +WFTN River,Rur ,

[0222] Among them, WTOUT Food,River WPTN is the total amount of food-derived nitrogen in domestic sewage after treatment.River,Urb WSTN is the total amount of food source nitrogen discharged into the river after primary treatment of urban domestic sewage. River,Urb WFTN is the total amount of food source nitrogen discharged into the river after secondary and tertiary treatment of urban domestic sewage. River,Urb WRTN is the total amount of food source nitrogen entering the river from urban domestic sewage treated by sewage treatment plants. River,Rur WFTN is the total amount of food source nitrogen entering the river from domestic sewage treated by rural sewage treatment plants. River,Rur It is the total amount of food source nitrogen entering the river from urban domestic sewage treated by sewage treatment plants.

[0223] The total amount of food-source nitrogen NO emitted during the whole process of domestic sewage treatment is:

[0224] WTOUT NO =WMTN NO,Urb +WMTN NO,Rur ,

[0225] Among them, WTOUT NO WMTN is the total amount of nitrogen (NO) emitted from food sources during the whole process of domestic sewage treatment. NO is the total NO emissions from returning manure and urine to farmland by urban and rural residents, WMTN NO =WMTN NO,Urb +WMTN NO,Rur .

[0226] The total N2 emission from food-derived nitrogen in domestic sewage is calculated as:

[0227]

[0228] Among them, WTOUT N2 Calculated as the total N2 emission from food-derived nitrogen in domestic sewage.

[0229] The nitrogen removal rate of food-source nitrogen in the whole sewage treatment process is calculated as:

[0230]

[0231] Wherein, Nr is the total amount of nitrogen that is not removed.

[0232] The nitrogen removal rate is obtained by the total amount of unremoved nitrogen, wherein the nitrogen removal rate is:

[0233]

[0234] Wherein, Nr is the total amount of unremoved nitrogen, NRE is the nitrogen removal rate of food source nitrogen in the whole process of sewage treatment, HM mau The nitrogen excretion from food sources of urban and rural residents;

[0235] A control strategy for the management of domestic nitrogen pollution from urban and rural domestic sewage is formulated based on the nitrogen emission flow analysis results and the nitrogen removal rate.

[0236] In some more specific embodiments, in combination Figure 2 The nitrogen flow analysis shown is divided into the food source nitrogen flow analysis of urban residents and the food source nitrogen flow analysis of rural residents. The food source nitrogen input includes 11 sources of food source nitrogen intake, including grain nitrogen intake, fruit nitrogen intake, pork nitrogen intake, beef nitrogen intake, mutton nitrogen intake, poultry nitrogen intake, vegetable and edible fungi nitrogen intake, aquatic product nitrogen intake, egg nitrogen intake, milk nitrogen intake and other food source nitrogen intake. 64% of the food source nitrogen in the input of urban residents' domestic sewage flows to the sewage terminal treatment, 36% enters the receiving water body in the form of direct discharge of feces and urine, and the feces and urine used for returning to the field is negligible according to the survey results. There are mainly three treatment pathways and discharge links for food source nitrogen flowing into the sewage terminal treatment: nitrogen is mainly discharged in the form of sludge nitrogen, river nitrogen and NH3 in the primary treatment process, and nitrogen is mainly discharged in the form of sludge nitrogen, river nitrogen, NH3, N2O and N2 in the secondary and tertiary treatment processes and sewage treatment device treatment processes. The flow of food-source nitrogen in rural domestic sewage is 20% flowing to direct discharge of feces and urine, 79% flowing into receiving water bodies through direct discharge of feces and urine, and only 1% entering the sewage terminal treatment. Among them, the main forms of food-source nitrogen flowing to the field of feces and urine are runoff loss, leaching loss, crop absorption, NH3, N2O, N2 and NO; the food-source nitrogen flowing to the sewage terminal treatment mainly has the following two treatment pathways and emission forms: the nitrogen in the sewage treatment process is mainly discharged in the form of sludge nitrogen, nitrogen entering the river, NH3, N2O, and N2, and the sewage treatment process is also mainly discharged in the form of sludge nitrogen, nitrogen entering the river, NH3, N2O, and N2. The nitrogen removal rate is calculated by analyzing the different forms of food-source nitrogen in urban and rural domestic sewage.

[0237] In some more specific embodiments, the method of formulating the nitrogen pollution control strategy for urban and rural domestic sewage based on the nitrogen emission flow analysis results and the nitrogen removal rate includes:

[0238] When the nitrogen removal rate is less than the first preset nitrogen removal rate, the recommended reduction measures for urban and rural direct nitrogen emission sources are obtained according to the nitrogen emission flow analysis result, wherein the recommended reduction measures for urban and rural direct nitrogen emission sources are used to indicate the expansion of the existing sewage treatment plant to increase the treatment capacity;

[0239] When the nitrogen removal rate is greater than or equal to the first preset nitrogen removal rate and less than the second preset nitrogen removal rate, obtaining recommended improvement measures for denitrification processes in various links of urban and rural sewage treatment according to the nitrogen emission flow direction analysis results;

[0240] When the nitrogen removal rate is greater than or equal to the second preset nitrogen removal rate, the recommended optimization measures for the dietary structure of urban and rural residents are obtained according to the nitrogen emission flow analysis results, wherein the first preset nitrogen removal rate is less than the second preset nitrogen removal rate.

[0241] In some more specific embodiments, according to the above nitrogen excretion from food sources of urban and rural residents, the recommended optimization measures for the dietary structure of urban and rural residents are as follows. Through community publicity, health education lectures and other forms, the concept of low-nitrogen diet is popularized to urban and rural residents, emphasizing the impact of reducing the intake of high-nitrogen foods on the environment and their own health, and guiding residents to form scientific and reasonable eating habits. Encourage urban and rural residents to increase the intake of foods with high nutritional value and low nitrogen content such as aquatic products, fruits, and vegetables, reduce the consumption ratio of high-nitrogen foods such as pork and beef, and choose white meat such as chicken and duck or soy products as protein sources, balance the nutritional intake of residents while reducing the intake of food source nitrogen. Promote ecological agriculture, encourage farmers to adopt ecological agricultural models to grow vegetables and fruits, reduce the use of chemical fertilizers, and thus reduce the nitrogen content in agricultural products. This can not only improve the nutritional value of agricultural products, but also reduce the flow of nitrogen into the food chain from the source, thereby reducing the pressure of urban and rural sewage treatment.

[0242] In some more specific embodiments, according to the above food source nitrogen flow analysis results, the reduction measures recommended for direct urban and rural nitrogen sources are recommended. In view of the current situation of continuous growth in urban sewage discharge, the existing sewage treatment plants are expanded to increase the treatment capacity to ensure that all sewage can be effectively treated. In areas with dense populations but insufficient coverage of existing treatment facilities, new small or medium-sized distributed sewage treatment stations are built to shorten the distance between sewage collection and treatment and reduce nitrogen losses during pipeline transportation. Sewage treatment plants are added in rural areas, and the site selection of sewage treatment plants is reasonably planned according to the rural population distribution, sewage discharge and water quality characteristics. Priority is given to building sewage treatment plants near villages with concentrated populations and large sewage discharges to facilitate sewage collection and treatment. Due to the vast territory and dispersed population in rural areas, the coverage and treatment capacity of sewage treatment plants are still limited, and decentralized sewage treatment facilities can be added. Rural residents are encouraged to collect, treat and recycle organic waste such as feces and urine. By building manure treatment facilities (such as composting, anaerobic digestion, etc.) and returning the treated manure to the fields as organic fertilizer, it not only reduces direct nitrogen emissions but also promotes the sustainable development of agricultural production.

[0243] In some more specific embodiments, the amount of unremoved food source nitrogen is 86766.04 tons, and the food source nitrogen removal rate is 27%, of which 46448.91 tons in cities, with a removal rate of 35%, and 40317.13 tons in rural areas, with a removal rate of 14%. The food source nitrogen removal rate is less than the preset nitrogen removal rate of 37%. Through the secondary urban sewage treatment method, through the peeling and inoculation of the biofilm on the MBBR suspended filler in the CASS+MBBR process, the proportion of nitrifying bacteria in the mixed liquid is increased, the nitrification capacity of the secondary treatment process is strengthened, and the optimized operation of the CASS process is combined to improve the nitrogen removal rate. The amount of nitrogen returned to the fields by urban and rural residents' feces and urine is 0.00 and 9.33Gg respectively, the amount of nitrogen discharged directly from feces and urine is 25.93 and 36.83Gg respectively, and the amount of nitrogen treated at the end of sewage is 45.83 and 0.48Gg respectively. Of the nitrogen in urban domestic sewage entering terminal treatment, 1.82Gg enters the sewage treatment device and 44.00Gg enters the sewage treatment plant, of which 1.22Gg only receives primary treatment and 42.78Gg undergoes subsequent secondary and tertiary treatment. Of the nitrogen in rural domestic sewage entering terminal treatment, 0.10Gg enters the sewage treatment device and 0.38Gg enters the sewage treatment plant.

[0244] In some more specific embodiments, according to the above-mentioned food source nitrogen removal rate of each link of urban and rural sewage treatment, the recommended improvement measures for the denitrification process of each link of urban and rural sewage treatment are as follows. The urban primary treatment does not treat the nitrogen in the sewage. The urban secondary and tertiary treatment adopts the CASS+MBBR process, and the CASS reaction tank is transformed to set the following functional zones: anaerobic zone, anoxic zone, and aerobic zone. The three functional zones are set independently. At the same time, in order to overcome the problem of insufficient nitrogen removal rate of the CASS process, internal reflow is increased to increase the reflow ratio. ASS (circulating activated sludge system) is an efficient sewage treatment process, and MBBR (moving bed biofilm reactor) can improve the efficiency of nitrogen removal. The urban sewage treatment device adopts anoxic-aerobic process. Through the combination of anoxic and aerobic processes, it can effectively remove organic matter and nitrogen in sewage. At the same time, combined with MBR, MBR is an advanced biofilm treatment technology. By combining bioreactors and membrane filtration systems, the functions of comprehensive biological treatment and membrane filtration can be effectively removed. Dissolved organic matter in sewage can be effectively removed. Rural sewage treatment equipment uses integrated sewage treatment technology, which is a technology that integrates multiple sewage treatment processes into one system, aiming to improve treatment efficiency, reduce floor space and reduce operating costs. Rural sewage treatment plants use vertical subsurface artificial wetlands, which are composed of a bed with a filter layer, an inlet system and an outlet system. Through vertical flow, sewage is fully in contact with the filter medium and aquatic plants planted in the wetland, which can effectively remove pollutants such as nitrogen and phosphorus.

Claims

1. A method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis, characterized in that: include: Obtaining the nitrogen excretion from food sources of urban and rural residents according to the nitrogen content of food of urban and rural residents, wherein the nitrogen excretion from food sources of urban and rural residents includes the nitrogen excretion from food sources of urban residents and the nitrogen excretion from food sources of rural residents; Obtaining food source nitrogen flow analysis results according to the food source nitrogen excretion of urban and rural residents, wherein the food source nitrogen flow analysis results include the nitrogen content of sewage terminal treatment; Obtaining nitrogen emission flow analysis results through the sewage terminal treatment nitrogen content; A domestic nitrogen pollution control and regulation strategy for urban and rural residents' domestic sewage is formulated based on the nitrogen emission flow analysis results, and the urban and rural residents' domestic sewage is treated based on the domestic nitrogen pollution control and regulation strategy.

2. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 1 is characterized in that: The nitrogen excretion from food sources of urban and rural residents is obtained according to the nitrogen content of food of urban and rural residents, including: The nitrogen intake of urban and rural residents from food sources is obtained according to the nitrogen content of urban and rural residents' food, wherein the nitrogen intake of urban and rural residents from food sources is: Among them, HMIN Food is the nitrogen intake from food sources of urban and rural residents, i,Urb is the per capita consumption of food i by urban residents, Food i,Rur is the per capita consumption of the ith food among rural residents, P Urb is the number of permanent residents in the city, P Rur is the number of permanent rural residents, is the nitrogen content in the ith food; The nitrogen excretion from food sources of urban and rural residents is obtained according to the nitrogen intake from food sources of urban and rural residents.

3. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 1 is characterized in that: The food source nitrogen flow analysis results obtained according to the food source nitrogen excretion of urban and rural residents include: Inputting the nitrogen excretion from food sources of urban residents into an urban nitrogen flow analysis model to obtain an urban nitrogen flow ratio coefficient; Obtaining an urban nitrogen flow analysis result according to the urban residents' food source nitrogen excretion and the urban nitrogen flow ratio coefficient; Inputting the rural residents' food source nitrogen excretion into the rural nitrogen flow analysis model to obtain the rural nitrogen flow ratio coefficient; Obtaining rural nitrogen flow analysis results according to the rural residents' food source nitrogen excretion and the rural nitrogen flow ratio coefficient; The food source nitrogen flow analysis result is obtained through the urban nitrogen flow analysis result and the rural nitrogen flow analysis result.

4. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 3 is characterized in that: The food source nitrogen flow analysis results include the nitrogen content of urine and feces returned to the field, the nitrogen content of sewage terminal treatment and the nitrogen content of urine and feces directly discharged, wherein the nitrogen content of urine and feces returned to the field is: H.M. mau,ht,j =R mau,ht,j ×HM mau,j , Among them, HM mau,ht,j is the nitrogen content of manure and urine returned to the field, R mau,ht,j HM is the urban nitrogen flow ratio coefficient of urban and rural residents’ manure and urine returned to farmland, mau,j The nitrogen excretion from food sources of urban and rural residents; Among them, the nitrogen content of the sewage terminal treatment is: H.M. WWT,j =HM mau,j ×R j,WWT , Among them, HM WWT,j is the nitrogen content of the wastewater at the end of treatment, HM mau,j is the nitrogen excretion from food sources of urban and rural residents, R j,WWT The urban nitrogen flow ratio coefficient for urban and rural excreta discharged into the sewage treatment system; Wherein, the direct nitrogen content of feces and urine is: H.M. mau,zp,i =HM mau,i -HM mau,ht,i -HM WWT,i , Among them, HM mau,zp,i It is the direct nitrogen content of feces and urine.

5. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 1 is characterized in that: The sewage terminal treatment nitrogen content includes the urban sewage terminal treatment nitrogen content and the rural sewage terminal treatment nitrogen content, the nitrogen emission flow analysis result includes the urban nitrogen emission flow analysis result and the rural nitrogen emission flow analysis result, and the nitrogen emission flow analysis result obtained by the sewage terminal treatment nitrogen content includes: The nitrogen content of the terminal treatment of urban sewage and the proportion of sewage treatment at all levels in the city are input into the urban nitrogen emission analysis model to obtain the urban nitrogen emission ratio coefficient; Obtaining the urban nitrogen emission flow direction analysis result according to the urban sewage terminal treatment nitrogen content and the urban nitrogen emission ratio coefficient; The rural sewage terminal treatment nitrogen content and the proportion of various types of rural sewage treatment are input into the rural nitrogen emission analysis model to obtain the rural nitrogen emission ratio coefficient; The rural nitrogen emission flow analysis results are obtained based on the rural sewage terminal treatment nitrogen content and the rural nitrogen emission ratio coefficient.

6. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 5 is characterized in that: The nitrogen emission flow analysis result obtained by treating the nitrogen content at the end of the sewage includes: The urban nitrogen emission flow analysis result is obtained by the nitrogen content of the urban sewage terminal treatment, wherein the urban nitrogen emission flow analysis result includes the primary treatment nitrogen emission, wherein the primary treatment nitrogen emission is: H.M. PWWT,Urb =R PWWT,Urb ×HM WWT,Urb , Among them, HM PWWT,Urb is the nitrogen emission from the primary treatment, R PWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage that only receives primary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

7. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 6 is characterized in that: The urban nitrogen emission flow analysis results also include secondary and tertiary treatment nitrogen emissions, wherein the secondary and tertiary treatment nitrogen emissions are: H.M. SWWT,Urb =R SWWT,Urb ×HM WWT,Urb , Among them, HM SWWT,Urb is the nitrogen emission from the secondary and tertiary treatment, R SWWT,Urb HM is the urban nitrogen emission ratio coefficient of urban domestic sewage receiving secondary and tertiary treatment, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

8. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 7 is characterized in that: The urban nitrogen emission flow analysis results also include the nitrogen emission of urban sewage treatment equipment, wherein the nitrogen emission of urban sewage treatment equipment is: H.M. WWTF,Urb =R WWTF,Urb ×HM WWT,Urb , Among them, HM WWTF,Urb is the nitrogen emission of the urban sewage treatment plant, R WWTF,Urb HM is the urban nitrogen emission ratio coefficient of urban residents’ domestic sewage treated by sewage treatment facilities, WWT,Urb It is the nitrogen content of the terminal treatment of urban sewage.

9. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 8, characterized in that: The nitrogen emission flow analysis result obtained by treating the nitrogen content at the end of the sewage includes: The rural nitrogen emission flow analysis result is obtained by the rural sewage terminal treatment nitrogen content, wherein the rural nitrogen emission flow analysis result includes the nitrogen emission of the sewage treatment plant and the nitrogen emission of the rural sewage treatment device; Among them, the nitrogen emissions from the sewage treatment plant are: H.M. WWTP,Rur =R PWWT,Rur ×HM WWT,Rur , Among them, HM WWTP,Rur is the nitrogen emission of the sewage treatment plant, R PWWT,Rur HM is the rural nitrogen emission ratio coefficient of rural residents’ domestic sewage entering the sewage treatment plant, WWT,Rur The nitrogen content of the rural sewage terminal treatment; Among them, the nitrogen emissions of the rural sewage treatment device are: H.M. WWTF,Rur =R WWTF,Rur ×HM WWT,Rur , Among them, HM WWTF,Rur is the nitrogen emission of the rural sewage treatment plant, R WWTF,Rur HM is the nitrogen emission ratio coefficient of rural residents’ domestic sewage treated by sewage treatment facilities, WWT,Rur The nitrogen content of the rural sewage terminal treatment.

10. The method for calculating and controlling nitrogen pollution from living sources based on high-resolution material flow analysis according to claim 1, characterized in that: The method of formulating a control strategy for nitrogen pollution from domestic sewage of urban and rural residents based on the nitrogen emission flow analysis results includes: Obtaining the total amount of unremoved nitrogen according to the nitrogen emission flow analysis result; The nitrogen removal rate is obtained by the total amount of unremoved nitrogen, wherein the nitrogen removal rate is: Wherein, Nr is the total amount of unremoved nitrogen, NRE is the nitrogen removal rate of food source nitrogen in the whole process of sewage treatment, HM mau The nitrogen excretion from food sources of urban and rural residents; A control strategy for the management of domestic nitrogen pollution from urban and rural domestic sewage is formulated based on the nitrogen emission flow analysis results and the nitrogen removal rate.

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