A method and device for calculating the effective collection and treatment capacity of urban sewage

Abstract

This application relates to the field of urban water environment protection and provides a method and device for calculating the effective collection and treatment capacity of sewage in urban areas. The calculation method uses the collection range of centralized sewage treatment facilities as the accounting unit, obtains data and analyzes it to obtain the centralized collection rate of domestic sewage and the centralized collection and reduction rate of pollutants. It also provides a method for evaluating the collection and treatment capacity of water pollutants. This method can objectively reflect the effective collection and treatment capacity and level of domestic sewage in urban areas, help to accurately investigate the basic data of sewage treatment, and provide technical support for improving the quality and efficiency of urban sewage treatment.

Description

Technical Field

[0001] The present invention relates to the field of urban water environment protection, and in particular to a method and device for calculating the effective sewage collection and treatment capacity in an urban area. Background Art

[0002] With water quality declining in key sections during flood season, low influent concentrations at sewage treatment plants leading to poor pollutant removal and insignificant water quality improvement, inadequate urban sewage collection and treatment is currently a major constraint on improving water quality in regions, particularly cities. In recent years, many water quality improvement efforts have focused solely on sewage treatment plants and tailwater discharge. With the accelerated construction of sewage treatment facilities nationwide, the scale and treatment rates of urban sewage treatment plants have increased significantly. However, it is crucial to recognize that the level of effective urban domestic sewage collection remains low.

[0003] At present, my country has not yet established an effective accounting method for the effective collection and treatment capacity of urban sewage. In the existing relevant technologies, the ratio of the total amount of sewage treated to the total amount of sewage discharged is used for calculation, without considering the many influences such as the statistics of urban domestic water consumption (self-provided water wells), residents' living habits, leakage of sewage pipe networks, rainwater and groundwater infiltration. The ratio of the average influent concentration to the maximum influent concentration or the influent concentration calculated by the pollution source census production and discharge coefficient is used as a correction coefficient, which does not exclude the influence of sewage from industry, livestock and poultry breeding, etc. Therefore, in order to comprehensively and objectively reflect the effective collection and treatment of sewage, it is urgent to construct an accounting method for the effective collection and treatment capacity of urban sewage, and then use the accounting results to guide local water ecological environment protection work. Summary of the Invention

[0004] The present application provides a method and device for calculating the effective collection and treatment capacity of urban sewage, so as to solve the problem in the current related technologies of lacking a reasonable and effective assessment of the collection and treatment capacity of urban sewage.

[0005] In a first aspect of the present application, a method for calculating the effective collection and treatment capacity of urban sewage is provided. The method uses the sewage collection range of a centralized sewage treatment facility as a calculation unit, obtains data for analysis, obtains a centralized domestic sewage collection rate, and a centralized pollutant collection reduction rate, and determines the theoretical domestic sewage treatment capacity of the accounting unit. The method also obtains a domestic sewage collection gap, a domestic sewage pollutant collection gap, and a centralized pollutant treatment gap, comprising the following steps:

[0006] S1: Obtain the influent and effluent data of the centralized sewage treatment facility, as well as the industrial wastewater data and livestock and poultry breeding wastewater data entering the centralized sewage treatment facility;

[0007] S2: Calculate the pollutant collection amount of each according to the influent data of the centralized sewage treatment facility, the industrial wastewater data and the livestock and poultry breeding wastewater data entering the centralized sewage treatment facility, and obtain the pollutant collection amount of domestic sewage;

[0008] S3: Calculating the centralized collection volume of domestic sewage based on the collected volume of domestic sewage pollutants;

[0009] S4: Obtain the amount of domestic sewage generated;

[0010] S5: Calculating a centralized collection rate of domestic sewage based on the centralized collection volume of domestic sewage and the generated volume of domestic sewage;

[0011] S6: Calculating the amount of pollutant reduction based on the influent data and effluent data of the centralized sewage treatment facility;

[0012] S7: Calculating the amount of domestic sewage pollutants generated based on the amount of domestic sewage generated;

[0013] S8: Calculate a centralized pollutant collection reduction rate based on the amount of pollutants generated in the domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutants reduced;

[0014] S9: Statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit, and compare it with the amount of domestic sewage generated. When the theoretical scale of centralized domestic sewage collection and treatment is greater than or equal to the amount of domestic sewage generated, it is determined that the theoretical domestic sewage treatment capacity of the accounting unit basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment is less than the amount of domestic sewage generated, it is determined that the theoretical domestic sewage treatment capacity of the accounting unit is insufficient.

[0015] S10: Obtaining statistical data on the design scale of sewage collection and treatment at decentralized treatment facilities within the accounting unit, and calculating the domestic sewage collection gap based on the design scale of sewage collection and treatment at decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment;

[0016] S11: Calculate the gap in domestic sewage pollutant collection based on the amount of domestic sewage pollutants collected and the amount of domestic sewage pollutants generated; calculate the gap in centralized pollutant treatment based on the amount of domestic sewage pollutants generated, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering centralized sewage treatment facilities, and the centralized pollutant collection reduction rate.

[0017] Optionally, the pollutants are any one or more pollutants including COD, BOD5, ammonia nitrogen, total nitrogen, and total phosphorus.

[0018] Optionally, in step S1, the centralized sewage treatment facility is a sewage treatment plant, and the inlet water data includes the daily inlet water volume and daily inlet pollutant concentration of the sewage treatment plant; the outlet water data includes the daily outlet pollutant concentration of the sewage treatment plant; the industrial wastewater data includes the sewage piped water volume and pollutant concentration of each online-monitored industrial enterprise within the accounting unit entering the sewage treatment plant, and the average pollutant concentration of sewage piped by enterprises without online monitoring; the livestock and poultry breeding wastewater data includes the discharge volume and pollutant concentration of each livestock and poultry farm within the accounting unit entering the sewage treatment plant.

[0019] Optionally, the accounting method of the present application uses COD as the pollutant accounting factor and one year as the accounting cycle. In step S2, the respective pollutant collection amounts and the domestic sewage pollutant collection amount are calculated, including the following steps:

[0020] S21, COD collection capacity of sewage treatment plant in M COD污水厂收集量 It is calculated according to the following formula:

[0021]

[0022] Among them, Q 进水，i and C 进水，i are the influent water volume and influent COD concentration of the sewage treatment plant on the i-th day of the accounting unit, and n is the total number of days in a year;

[0023] S22, industrial wastewater COD collection volume in M COD工业收集量 It is calculated according to the following formula:

[0024]

[0025] Where: Q 工业企业，j and C 工业企业，j are the annual piped water volume and COD concentration of the jth online monitoring industrial enterprise in the accounting unit; m is the number of industrial enterprises in the accounting unit that have installed automatic water volume and water quality monitoring facilities at their pipe ports, Q 工业用水 The total annual industrial water consumption of enterprises without online monitoring in the accounting unit. 工业用水 The K is the sum of industrial water consumption among public water supply users, users with their own water sources and users who purchase steam. 工业污水排放系数 For the ratio of wastewater discharge to water consumption of enterprises without online monitoring within the accounting unit, the C 工业排水 is the average COD concentration of enterprises without online monitoring, and K 工业污水排放系数 and C 工业排水 Obtained through annual environmental statistics or pollution source census data respectively;

[0026] S23, calculate the COD collection volume of livestock and poultry wastewater M according to the formula COD畜禽养殖收集量 :

[0027]

[0028] Where: Q 畜禽养殖排水，k and C 畜禽养殖排水，k are the annual sewage discharge volume and COD concentration of the kth livestock and poultry farm discharged into the sewage treatment plant, respectively; l is the number of livestock and poultry farms that discharge sewage into the sewage treatment plant in the accounting unit;

[0029] S24, according to the M obtained in steps S21, S22, and S23 COD污水厂收集量 、M COD工业收集量 and M COD畜禽养殖收集量 , use the following formula to calculate the domestic sewage COD collection volume M COD生活收集量 :

[0030] M COD生活收集量 =M COD污水厂收集量 -M COD工业收集量 -M COD畜禽养殖收集量

[0031] In step S3, the amount of domestic sewage collected is Q 生活集中收集 It is calculated according to the following formula:

[0032] Q 生活集中收集 =M COD生活收集量 / C 生活校核浓度

[0033] Among them, M COD生活收集量 Obtained through step S24, C 生活校核浓度 For the COD calibration concentration of domestic sewage, select 260mg / L or 350mg / L;

[0034] The amount of domestic sewage generated in step S4 is Q 生活污水产生 It is calculated according to the following formula:

[0035] Q 生活污水产生 =(Q 公共供水，生活 +Q 自备水源，生活 )×K 生活污水产生系数

[0036] Among them, Q 公共供水，生活 Q is the total annual domestic water consumption from public water supply facilities within the accounting unit; 自备水源，生活 The total annual domestic water consumption from self-supplied water sources within the accounting unit; K 生活污水产生系数 The ratio of domestic sewage discharge to water consumption within the accounting unit is 0.8 to 0.9;

[0037] In step S5, the centralized collection rate of domestic sewage is represented by R and is calculated according to the following formula:

[0038] R=Q 生活集中收集 / Q 生活污水产生 .

[0039] Optionally, the calculation method of this application also includes:

[0040] In step S6, the pollutant reduction amount of the centralized sewage treatment facility is expressed as M COD处理削减量 It is calculated according to the following formula:

[0041]

[0042] Where: Q 进水，i 、C 进水，i and C 出水，i are the influent volume, influent COD concentration, and effluent COD concentration of the sewage treatment plant on the i-th day of the accounting unit, respectively, and n is the total number of days in a year;

[0043] In step S7, the amount of domestic sewage pollutants generated is calculated based on the amount of domestic sewage generated obtained in step S4, and the amount of domestic sewage pollutants generated is expressed as M COD生活产生量 It is calculated according to the following formula:

[0044] M COD生活产生量 =Q 生活污水产生 ×C 生活校核浓度 , where Q 生活污水产生 From step S4, C 生活校核浓度 Obtained from step S3;

[0045] In step S8, the pollutant centralized collection reduction rate, represented by R', is calculated according to the following formula:

[0046] R'=M COD处理削减量 / (M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 ).

[0047] Optionally, the accounting method of this application also includes: calculating the centralized collection rate of domestic sewage and the centralized collection reduction rate of pollutants in the urban accounting area, respectively using R 区域 and R′ 区域 It is calculated according to the following formula:

[0048]

[0049] Among them, Q 生活集中收集，h Q is the centralized collection volume of domestic sewage in the hth accounting unit in the urban area. 生活污水产生，his the amount of domestic sewage generated by the hth accounting unit in the urban area under calculation, and b is the number of accounting units in the urban area under calculation;

[0050]

[0051] Among them, M COD处理削减量，h is the pollutant reduction amount of the hth accounting unit in the urban area under calculation, M COD生活产生量，h is the amount of domestic sewage pollutants generated in the hth accounting unit within the urban area, M COD工业收集量，h is the amount of industrial wastewater pollutants collected by the hth accounting unit in the urban area under accounting, M COD畜禽养殖收集量，h is the amount of wastewater pollutants collected from livestock and poultry farms in the hth accounting unit within the urban area under accounting, and b is the number of accounting units within the urban area under accounting.

[0052] Optionally, the calculation method of this application also includes:

[0053] In step S9, the theoretical scale of centralized domestic sewage collection and treatment in the accounting unit is obtained by statistics, and Q 生活集中处理理论规模 It is calculated according to the following formula:

[0054] Q 生活集中处理理论规模 =Q 设计 -Q 工业排水 -Q 畜禽养殖排水

[0055] Among them, Q 设计 is the total design scale of the centralized sewage treatment plant; Q 工业排水 The annual water volume collected by industrial enterprises entering centralized sewage treatment plants is calculated using the following formula:

[0056]

[0057] Where: Q 工业企业，j ,m,Q 工业用水 , K 工业污水排放系数 All are obtained from step S22;

[0058] Q 畜禽养殖排水 The annual water volume collected by livestock and poultry farms entering the centralized sewage treatment plant within the accounting unit is calculated using the following formula:

[0059]

[0060] Among them, l and Q 畜禽养殖排水，k All are obtained from step S23;

[0061] In step S10, the design scale of sewage collection and treatment of decentralized treatment facilities in the accounting unit is obtained, and Q 分散处理 It is calculated according to the following formula:

[0062]

[0063] Q 分散式，x is the design scale of the xth decentralized sewage treatment facility in the accounting unit; c is the number of decentralized sewage treatment facilities in the accounting unit;

[0064] Calculate the domestic sewage collection gap as Q 缺口 It is calculated according to the following formula:

[0065] Q 缺口 =Q 生活污水产生 -Q 生活集中处理理论规模 -Q 分散处理

[0066] The amount of domestic sewage generated Q 生活污水产生 Obtained from step S4;

[0067] In step S11, the COD collection gap of domestic sewage is M COD生活收集缺口量 It is calculated according to the following formula:

[0068] M COD生活收集缺口量 =M COD生活产生量 -M COD生活收集量

[0069] Among them, M COD生活产生量 From step S7, M COD生活收集量 Obtained from step S24;

[0070] The gap in COD centralized treatment is M COD处理缺口量 It is calculated according to the following formula:

[0071] M COD处理缺口量 =(M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 )×(1-R').

[0072] Optionally, the calculation method of this application also includes:

[0073] The theoretical scale of centralized domestic sewage collection and treatment in each accounting unit within the urban area obtained by statistics is summed to obtain the theoretical scale of centralized domestic sewage collection and treatment in the accounting area, and the domestic sewage generation of each accounting unit is summed to obtain the domestic sewage generation in the area;

[0074] When the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is ≥ the amount of domestic sewage generated in the area, it is judged that the theoretical treatment capacity of domestic sewage in the accounting area basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is < the amount of domestic sewage generated in the area, it is judged that the theoretical treatment capacity of domestic sewage in the accounting area is insufficient.

[0075] Optionally, the calculation method of the present application further includes: summing the calculated domestic sewage collection gaps of the various accounting units within the urban area to obtain the regional domestic sewage collection gap;

[0076] The calculated pollutant centralized collection and treatment gaps of each accounting unit within the urban area are summed up to obtain the regional pollutant centralized collection and treatment gaps.

[0077] In a second aspect of the present application, a device for calculating the effective collection and treatment capacity of sewage in an urban area is provided, comprising:

[0078] Sewage data input module, used to input the inlet and outlet data of centralized sewage treatment facilities, industrial wastewater data, and livestock and poultry breeding wastewater data;

[0079] A pollutant collection amount calculation module, used to calculate the amount of domestic sewage pollutants collected based on the data obtained by the sewage input module;

[0080] A sewage collection volume calculation module is used to calculate the domestic sewage collection volume based on the obtained domestic sewage pollutant collection volume;

[0081] A sewage generation amount acquisition module is used to obtain the amount of domestic sewage generated;

[0082] A sewage centralized collection rate calculation module, configured to calculate the domestic sewage centralized collection rate based on the domestic sewage collection volume and the domestic sewage generation volume;

[0083] a pollutant reduction calculation module, configured to calculate the pollutant reduction based on the influent data and effluent data of the centralized sewage treatment facility;

[0084] A domestic sewage pollutant generation amount calculation module is used to calculate the pollutant generation amount based on the domestic sewage generation amount;

[0085] a pollutant reduction rate calculation module, configured to calculate a pollutant centralized collection reduction rate based on the amount of pollutants generated in the domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutant reduction;

[0086] The domestic sewage theoretical treatment capacity determination module is used to statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit and compare it with the amount of domestic sewage generated. When the theoretical scale of centralized domestic sewage collection and treatment is greater than or equal to the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment is less than the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit is insufficient;

[0087] The domestic sewage collection gap calculation module is used to statistically obtain the sewage collection and treatment design scale of decentralized treatment facilities within the accounting unit, and calculate the domestic sewage collection gap based on the sewage collection and treatment design scale of decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment;

[0088] The pollutant centralized collection and treatment gap calculation module is used to calculate the domestic sewage pollutant collection gap based on the domestic sewage pollutant collection amount and the domestic sewage pollutant generation amount; and to calculate the pollutant centralized treatment gap based on the domestic sewage pollutant generation amount, the pollutant collection amount of industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facilities, and the pollutant centralized collection reduction rate.

[0089] Compared with the prior art, the present invention has the following beneficial effects:

[0090] The method and device for calculating the effective collection and treatment capacity of urban sewage, provided by this invention, facilitate objectively reflecting the effective collection and treatment capacity and level of domestic sewage in urban areas, eliminating the influence of some key interfering factors. By calculating and evaluating the centralized sewage collection capacity, it is possible to avoid the problem of "inflated" urban sewage treatment rates caused by factors such as leakage in sewage pipe networks, rainwater infiltration into groundwater, and mixed treatment of industrial and domestic sewage. Furthermore, this method can accurately assess the basic data of sewage treatment, identify weak links, support the filling of shortcomings in water pollution control, and continuously improve the quality of the water ecological environment, with good environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0092] Figure 1 Schematic diagram of the flow of steps S1-S8 of the accounting method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0093] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0094] It should be noted that the accounting unit mentioned in the present invention is based on the wastewater collection area of ​​a centralized sewage treatment facility, such as a sewage treatment plant, that is, one accounting unit corresponds to one centralized sewage treatment facility.

[0095] Furthermore, the "accounting area" mentioned in this invention can be a county (city, district) urban planning area, a provincial-level or higher industrial park integrating industry and city, or a contiguous urban planning area of ​​a prefecture-level city. The accounting period can be a single year or a continuous period of time.

[0096] The pollutants in this method are any one or more pollutants including COD, BOD5, ammonia nitrogen, total nitrogen, and total phosphorus.

[0097] Example 1

[0098] This embodiment provides an evaluation and accounting method for the effective sewage collection and treatment capacity in urban areas, taking the radiation area of ​​the centralized sewage treatment facility, that is, the sewage collection area, as the accounting unit. In this embodiment, the centralized sewage treatment facility is equivalent to the sewage treatment plant, and COD is used as the accounting factor. With one year as the accounting cycle, the centralized collection rate of domestic sewage in the urban area, the centralized collection reduction rate of COD, the domestic sewage collection gap, the domestic sewage pollutant collection gap, and the pollutant centralized treatment gap are finally obtained, and it is determined whether the theoretical domestic sewage treatment capacity of the area meets the demand.

[0099] The calculation method of this embodiment, wherein steps S1-S8 are as follows Figure 1 As shown, the specific steps include:

[0100] S1: Obtain the influent and effluent data of the centralized sewage treatment facility, as well as the industrial wastewater data and livestock and poultry breeding wastewater data entering the centralized sewage treatment facility;

[0101] For centralized sewage treatment facilities, namely sewage treatment plants, the inlet water data include the daily inlet water volume and daily inlet pollutant concentration of the sewage treatment plant; the outlet water data include the daily outlet pollutant concentration; the industrial wastewater data include the sewage water volume and pollutant concentration of each online-monitored industrial enterprise entering the sewage treatment plant within the accounting unit, and the average pollutant concentration of sewage entering the sewage treatment plant by enterprises without online monitoring; the livestock and poultry breeding wastewater data include the discharge volume and pollutant concentration of each livestock and poultry farm entering the sewage treatment plant within the accounting unit.

[0102] S2: Based on the influent data of the centralized sewage treatment facility, the industrial wastewater data and the livestock and poultry breeding wastewater data entering the centralized sewage treatment facility, the respective pollutant collection quantities are calculated to obtain the domestic sewage pollutant collection quantity; the respective pollutant collection quantities refer to the pollutant collection quantities of the centralized sewage treatment facility, the industrial wastewater pollutant collection quantities and the livestock and poultry breeding wastewater pollutant collection quantities.

[0103] In this embodiment, the pollutant refers to COD. Specifically, the total COD of the influent of the centralized sewage treatment facility is calculated, and the COD contribution of industrial and livestock and poultry breeding wastewater entering the centralized sewage treatment facility is deducted to obtain the COD collection amount of domestic sewage in the accounting unit.

[0104] Follow these steps:

[0105] S21, COD collection capacity of sewage treatment plant in M COD污水厂收集量 It is calculated according to the following formula:

[0106]

[0107] Among them, Q 进水，i and C 进水，i are the daily influent volume and influent COD concentration of the sewage treatment plant in the accounting unit, which should be measured from the water inlet of the plant. n is the number of days. In this embodiment, one year is the cycle, and n represents the total number of days in a year.

[0108] Depending on the units of each quantity, you can multiply the coefficient 1000 or 0.001 before the formula to maintain the measurement balance of the formula. For example, when the water inflow is Q 进水，i The unit is m 3 / d (d represents the number of days), C 进水，i The unit is mg / L, M COD污水厂收集量 The unit is kg / a (a represents years). At this time, you can multiply the coefficient 0.001 on the right side of the formula to obtain the balance of measurement units.

[0109] S22, industrial wastewater COD collection volume in M COD工业收集量 It is calculated according to the following formula:

[0110]

[0111] Where: Q 工业企业，j and C 工业企业，j are the annual water volume and COD concentration of the jth online monitoring industrial enterprise in the accounting unit, which should be measured from the enterprise sewage inlet; m is the number of industrial enterprises in the accounting unit that have installed automatic water volume and water quality monitoring facilities at their outlets; Q 工业用水 The total annual industrial water consumption of enterprises without online monitoring in the accounting unit. 工业用水 The K is the sum of industrial water consumption among public water supply users, users with their own water sources and users who purchase steam. 工业污水排放系数 For the ratio of wastewater discharge to water consumption of enterprises without online monitoring within the accounting unit, the C 工业排水 is the average COD concentration of enterprises without online monitoring, and K 工业污水排放系数 and C 工业排水Obtained through annual environmental statistical data or pollution source census data; K of each accounting unit in the same area 工业污水排放系数 Generally, the same or similar values ​​can be taken.

[0112] S23, calculate the COD collection volume of livestock and poultry wastewater M according to the formula COD畜禽养殖收集量 :

[0113]

[0114] Where: Q 畜禽养殖排水，k and C 畜禽养殖排水，k are the sewage discharge volume and COD concentration of the kth livestock and poultry farm discharged into the sewage treatment plant, respectively; l is the number of livestock and poultry farms that discharge sewage into the sewage treatment plant in the accounting unit;

[0115] S24, according to the M obtained in steps S21, S22, and S23 COD污水厂收集量 、M COD工业收集量 and M COD畜禽养殖收集量 , use the following formula to calculate the domestic sewage COD collection volume M COD生活收集量 :

[0116] M COD生活收集量 =M COD污水厂收集量 -M COD工业收集量 -M COD畜禽养殖收集量

[0117] S3: Calculating the centralized collection volume of domestic sewage based on the collected volume of domestic sewage pollutants;

[0118] According to the COD collection volume of the accounting unit domestic sewage obtained in step S2, the concentration of pollutants in urban domestic sewage is calibrated to obtain the centralized collection volume of domestic sewage for the accounting unit;

[0119] The centralized collection volume of domestic sewage is Q 生活集中收集 It is calculated according to the following formula:

[0120] Q 生活集中收集 =M COD生活收集量 / C 生活校核浓度

[0121] Among them, M COD生活收集量 Obtained through step S24, C 生活校核浓度 For the COD calibration concentration of domestic sewage, select 260mg / L or 350mg / L.

[0122] Specifically, based on factors such as the COD concentration of the influent of urban sewage treatment plants, the daily COD emissions per person in urban areas, the quota of domestic sewage, and the migration and transformation of pollutants, the present invention adopts the low-order calibration concentration (i.e., 260 mg / L) or high-order calibration concentration (i.e., 350 mg / L) of urban domestic sewage COD in the accounting area for accounting. When selecting, it can be selected according to conditions such as the economic development of the accounting area and the living standards of residents. In areas with more developed cities and more densely populated areas, such as Jiangsu Province, a high-order calibration concentration of 350 mg / L can be used. Different accounting units within the same accounting area can generally take the same value for the COD calibration concentration of domestic sewage.

[0123] S4: Obtain the amount of domestic sewage generated;

[0124] The amount of domestic sewage generated in step S4 is Q 生活污水产生 It is calculated according to the following formula:

[0125] Q 生活污水产生 =(Q 公共供水，生活 +Q 自备水源，生活 )×K 生活污水产生系数

[0126] Among them, Q 公共供水，生活 This is the total annual domestic water consumption within the accounting unit, drawn from public water supply facilities. This represents actual water consumption by water users; public water supply users are various waterworks. For water users with metering facilities, the measured water consumption should be used as the statistical basis for water consumption. For water users without metering facilities, water quotas can be obtained from a sample of typical water users to estimate water consumption.

[0127] Q 自备水源，生活 The total annual domestic water consumption from self-supplied water sources within the accounting unit should be measured at the water intake and counted individually. Where measurement is not used, water consumption can be estimated based on typical water output per unit time (water output per unit of electricity consumption) or by deriving water quotas from a sample of typical water users.

[0128] K 生活污水产生系数 K is the ratio of domestic sewage discharge to water consumption within the accounting unit, and is taken as 0.8 to 0.9 according to the "Outdoor Drainage Design Code" (GB 50014-2006). 生活污水产生系数 Generally, the same value is taken.

[0129] S5: Calculating a centralized collection rate of domestic sewage based on the domestic sewage collection amount and the domestic sewage generation amount;

[0130] The centralized collection rate of domestic sewage is represented by R and is calculated according to the following formula:

[0131] R=Q 生活集中收集 / Q 生活污水产生

[0132] Among them, Q 生活集中收集 The value of Q is obtained from step S3. 生活污水产生 The value of is obtained from step S4.

[0133] S6: Calculating the amount of pollutant reduction based on the influent data and effluent data of the centralized sewage treatment facility;

[0134] The pollutant reduction of the centralized sewage treatment facility is expressed as M COD处理削减量 It is expressed as follows:

[0135]

[0136] Where: Q 进水，i 、C 进水，i and C 出水，i are the daily influent volume, influent COD concentration, and effluent COD concentration of the sewage treatment plant of the accounting unit, respectively, and n is the total number of days in a year; the above data can be obtained from step S1.

[0137] S7: Calculate the amount of domestic sewage pollutants generated based on the amount of domestic sewage generated obtained in step S4, and calculate the amount of domestic sewage pollutants generated according to the following formula: COD生活产生量 Indicates: M COD生活产生量 =Q 生活污水产生 × C 生活校核浓度 , where Q 生活污水产生 From step S4, C 生活校核浓度 Obtained from step S3;

[0138] S8: Calculate a centralized pollutant collection reduction rate based on the amount of pollutants generated in the domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutants reduced;

[0139] The pollutant centralized collection reduction rate, represented by R', is calculated according to the following formula:

[0140] R'=M COD处理削减量 / (M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 ).

[0141] As attached Figure 1As shown, the above steps can be used to calculate the centralized collection rate of domestic sewage and the centralized collection reduction rate of pollutants for the accounting unit. In addition, the centralized collection volume of domestic sewage, the volume of domestic sewage generated, the reduction volume of pollutants, and the volume of pollutant generated for each accounting unit in the urban area are calculated one by one through the above steps. Then, the centralized collection rate of domestic sewage and the centralized collection reduction rate of pollutants in the urban accounting area can be calculated according to the following steps:

[0142] R 区域 and R′ 区域 It represents the centralized collection rate of domestic sewage and the centralized collection reduction rate of pollutants in the urban accounting area, calculated according to the following formula:

[0143]

[0144] Among them, Q 生活集中收集，h Q is the centralized collection volume of domestic sewage in the hth accounting unit in the urban area. 生活污水产生，h is the amount of domestic sewage generated by the hth accounting unit in the urban area under calculation, and b is the number of accounting units in the urban area under calculation;

[0145]

[0146] Among them, M COD处理削减量，h is the pollutant reduction amount of the hth accounting unit in the urban area under calculation, M COD生活产生量，h is the amount of domestic sewage pollutants generated in the hth accounting unit within the urban area, M COD工业收集量，h is the amount of industrial wastewater pollutants collected by the hth accounting unit in the urban area under accounting, M COD畜禽养殖收集量，h is the amount of wastewater pollutants collected from livestock and poultry farms in the hth accounting unit within the urban area under accounting, and b is the number of accounting units within the urban area under accounting.

[0147] It is worth noting that in addition to using the above method to calculate the centralized collection rate of domestic sewage and the centralized collection and reduction rate of pollutants in the urban accounting area, it is also possible to not follow the fixed step sequence of this embodiment, and to superimpose the relevant values ​​of each accounting unit in the intermediate process. For example, after step S3, the sum is taken, that is, the sum of the COD collection amount of domestic sewage of each accounting unit in the accounting area is the total COD collection amount of domestic sewage in the accounting area, and then the calibration concentration of urban domestic sewage pollutants is used to obtain the total centralized collection amount of domestic sewage in the accounting area; for example, after step S6, the COD reduction amount of each accounting unit in the urban area can be added to obtain the total COD reduction amount of the accounting area; and then the centralized collection rate of domestic sewage and the centralized collection and reduction rate of pollutants in the accounting area are calculated.

[0148] Step S9: Statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit, that is, the difference between the total design scale of the regional centralized sewage treatment plant and the amount of water received by industrial enterprises and livestock and poultry farms entering the centralized sewage treatment plant, and compare it with the amount of domestic sewage generated;

[0149] Obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit, using Q 生活集中处理理论规模 It is calculated according to the following formula:

[0150] Q 生活集中处理理论规模 =Q 设计 -Q 工业排水 -Q 畜禽养殖排水

[0151] Among them, Q 设计 is the total design scale of the centralized sewage treatment plant; Q 工业排水 The annual water volume collected by industrial enterprises entering centralized sewage treatment plants is calculated using the following formula:

[0152]

[0153] Where: Q 工业企业，j ,m,Q 工业用水 , K 工业污水排放系数 All are obtained from step S22;

[0154] Q 畜禽养殖排水 The annual water volume collected by livestock and poultry farms entering the centralized sewage treatment plant within the accounting unit is calculated using the following formula:

[0155]

[0156] Among them, l and Q 畜禽养殖排水，k All are obtained from step S23;

[0157] When Q 生活集中处理理论规模 ≥Q 生活污水产生 , indicating that the theoretical treatment capacity of domestic sewage in the accounting unit basically meets the demand;

[0158] When Q 生活集中处理理论规模 <Q 生活污水产生 , indicating that the theoretical treatment capacity of domestic sewage in the accounting unit is insufficient. The domestic sewage treatment capacity should be improved by building or expanding sewage treatment facilities, and the shortcomings in sewage treatment facility construction should be accelerated.

[0159] S10: Obtain the design scale of sewage collection and treatment of decentralized treatment facilities within the accounting unit, and calculate the domestic sewage collection gap based on the design scale of sewage collection and treatment of decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment; wherein, the design scale of sewage collection and treatment of decentralized treatment facilities is expressed as Q分散处理 It is calculated according to the following formula:

[0160]

[0161] Among them, Q 分散式，x is the design scale of the xth decentralized sewage treatment facility in the accounting unit; c is the number of decentralized sewage treatment facilities in the accounting unit.

[0162] Calculate the gap in domestic sewage collection in the living area as Q 缺口 It is calculated according to the following formula:

[0163] Q 缺口 =Q 生活污水产生 -Q 生活集中处理理论规模 -Q 分散处理

[0164] The amount of domestic sewage generated Q 生活污水产生 Obtained from step S4;

[0165] In step S11, the COD collection gap of domestic sewage is M COD生活收集缺口量 It is calculated according to the following formula:

[0166] M COD生活收集缺口量 =M COD生活产生量 -M COD生活收集量

[0167] Among them, M COD生活产生量 From step S7, M COD生活收集量 Obtained from step S24;

[0168] The gap in COD centralized treatment is M COD处理缺口量 It means the amount of COD discharged directly from untreated domestic sewage and the total amount of domestic, industrial and livestock wastewater collected and treated and discharged into the environment, calculated according to the following formula:

[0169] M COD处理缺口量 =(M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 )×(1-R')

[0170] Here, R' is obtained from step S8.

[0171] The above is the accounting method for a certain accounting unit. If the accounting is to be carried out for the entire urban area, this accounting method also includes:

[0172] The theoretical scale of centralized domestic sewage collection and treatment in each accounting unit within the urban area obtained by statistics is summed to obtain the theoretical scale of centralized domestic sewage collection and treatment in the accounting area, and the domestic sewage generation of each accounting unit is summed to obtain the domestic sewage generation in the area;

[0173] When the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is greater than or equal to the amount of domestic sewage generated in the area, the theoretical domestic sewage treatment capacity in the accounting area is determined to basically meet the demand; when the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is less than the amount of domestic sewage generated in the area, the theoretical domestic sewage treatment capacity in the accounting area is determined to be insufficient;

[0174] The calculated domestic sewage collection gap of each accounting unit in the urban area is summed up to obtain the domestic sewage collection gap of the accounting area;

[0175] The calculated gap in centralized collection and treatment of pollutants of each accounting unit within the urban area is summed up to obtain the gap in centralized collection and treatment of pollutants in the accounting area.

[0176] Example 2:

[0177] Taking a county (city, district) with a provincial or higher industrial park integrating industry and city as an example, the effective collection and treatment capacity of sewage in urban areas is calculated, with COD as the calculation factor.

[0178] Accounting unit 1: The COD collection volume of the centralized sewage treatment plant is 3,780,000 kg / a; the total COD collection volume of industrial wastewater from enterprises under online monitoring entering the sewage treatment plant is 8,900 kg / a, and the industrial water consumption of enterprises under non-online monitoring is 3,250,000 m 3 / a, K in the annual environmental statistical data of this accounting unit 工业污水排放系数 The average COD concentration in the pipe is 0.70 and 330 mg / L; no livestock and poultry breeding wastewater enters the sewage treatment plant in this unit.

[0179] According to the accounting method of the present invention, the COD collection capacity of domestic sewage of accounting unit 1 is calculated to be 3,020,000 kg / a.

[0180] Accounting unit 2: The COD collection volume of the centralized sewage treatment plant is 580,000 kg / a; the total COD collection volume of industrial wastewater from enterprises under online monitoring entering the sewage treatment plant is 6,500 kg / a, and the industrial water consumption of enterprises under non-online monitoring is 1,620,000 m 3 / a, K in the annual environmental statistical data of this accounting unit 工业污水排放系数 The average COD concentration in the pipe is 0.80 and 240 mg / L; no livestock and poultry breeding wastewater enters the sewage treatment plant in this unit.

[0181] According to the accounting method of the present invention, the COD collection capacity of domestic sewage of accounting unit 2 is calculated to be 262,500 kg / a.

[0182] The sum of the COD collection volume of domestic sewage in each accounting unit within the accounting area is the total COD collection volume of domestic sewage in the accounting area; the total amount of domestic sewage collected in the accounting area is obtained by calibrating the concentration of pollutants in urban domestic sewage. Specifically: the total COD collection volume of domestic sewage in the accounting area is 3282500kg / a; the COD calibration concentration of urban domestic sewage in the accounting area is selected as 350mg / L, and the centralized collection volume of domestic sewage in the accounting area is 9378600m 3 / a.

[0183] The total domestic water consumption in the accounting area is 19,000,000m 3 / a, the ratio of domestic sewage discharge to water consumption in the accounting area K 生活污水产生系数 Select 0.90; the total amount of domestic sewage generated in the accounting area is 17,100,000 m 3 / a; Therefore, the ratio of the total amount of domestic sewage collected in the accounting area to the total amount of domestic sewage generated is the centralized collection rate of domestic sewage in the accounting area. The calculated centralized collection rate of domestic sewage in the area is 55%.

[0184] The total COD reduction of sewage treatment plants in the accounting area is 4,005,000 kg / a; the total COD generation of domestic sewage in the accounting area is 5,985,000 kg / a, the total COD of industrial wastewater entering the centralized sewage treatment facilities is 1,077,190 kg / a, and no livestock and poultry breeding wastewater enters the centralized sewage treatment facilities; the COD centralized collection reduction rate in the accounting area is 57%.

[0185] From the above-mentioned centralized domestic sewage collection rate of 55% and the centralized COD collection reduction rate of 57%, it can be seen that the effective collection capacity of urban domestic sewage in the accounting area is not high. There may be problems such as insufficient sewage collection capacity, lagging pipeline network construction, inadequate separation of rainwater and sewage, and low influent concentration of centralized sewage treatment facilities. It is urgent to investigate and evaluate the current sewage collection and treatment situation, and accurately promote the construction of sewage treatment infrastructure and improve quality and efficiency.

[0186] The total design capacity of centralized sewage treatment plants in the accounting area is 36 million m 3 / a, the amount of water piped into centralized sewage treatment plants by industrial enterprises is 3.6 million m 3 / a, if there is no livestock and poultry breeding wastewater entering, the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is 32.4 million m 3 / a; Since the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is greater than the total amount of domestic sewage generated, it shows that the theoretical treatment capacity of domestic sewage in the accounting area basically meets the demand.

[0187] There are no decentralized sewage treatment facilities in the accounting area, and the domestic sewage collection gap in the accounting area is negative, indicating that there is no gap in domestic sewage collection in the accounting area. Therefore, to improve the effective sewage collection and treatment capacity, we should focus on improving the quality and efficiency of the sewage collection network.

[0188] The COD collection gap for domestic sewage in the accounting area is 2,702,500 kg / a, and the total COD centralized collection and treatment gap in the accounting area is 3,037,000 kg / a, indicating that urban domestic sewage pollutants are still discharged into the external environment in the accounting area, and the effective collection and treatment capacity of pollutants is not high. It is urgent to take measures to improve the collection and treatment capacity and level of urban domestic sewage in the area.

[0189] Based on the results of this assessment and calculation, this invention can track problems encountered during infrastructure construction and operation, providing data support for relevant departments to formulate water environment governance measures, and guiding local governments to identify weak links and implement differentiated governance. Actual measurements have shown that the results of this invention are accurate and have strong practical value. Repeated case studies in different regions have yielded reliable results, which will not be detailed here.

[0190] Example 3

[0191] This embodiment 3 is an apparatus embodiment of the present application, which can be used to execute the method embodiment of the present invention. For details not disclosed in the apparatus embodiment of the present invention, please refer to the method embodiment of the present invention.

[0192] Example 3 of the present application provides a device for calculating the effective collection and treatment capacity of sewage in an urban area, comprising:

[0193] Sewage data input module, used to input the inlet and outlet data of centralized sewage treatment facilities, industrial wastewater data, and livestock and poultry breeding wastewater data;

[0194] A pollutant collection amount calculation module, used to calculate the amount of domestic sewage pollutants collected based on the data obtained by the input module;

[0195] A sewage collection volume calculation module is used to calculate the domestic sewage collection volume based on the obtained domestic sewage pollutant collection volume;

[0196] Sewage generation acquisition module: used to obtain the amount of domestic sewage generated;

[0197] A sewage centralized collection rate calculation module is used to calculate the domestic sewage centralized collection rate according to the domestic sewage collection amount and the domestic sewage generation amount;

[0198] Pollutant reduction calculation module: used to calculate the pollutant reduction based on the inlet and outlet data of the centralized sewage treatment facility;

[0199] Domestic sewage pollutant generation amount calculation module: calculates the domestic sewage pollutant generation amount according to the domestic sewage generation amount;

[0200] Pollutant reduction rate calculation module: used to calculate the pollutant centralized collection reduction rate based on the amount of domestic sewage pollutants generated, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutant reduction.

[0201] Domestic sewage theoretical treatment capacity determination module: used to statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit, and compare it with the amount of domestic sewage generated. When the theoretical scale of centralized domestic sewage collection and treatment is greater than or equal to the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment is less than the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit is insufficient;

[0202] Domestic sewage collection gap calculation module: used to obtain the design scale of sewage collection and treatment of decentralized treatment facilities within the accounting unit, and calculate the domestic sewage collection gap based on the design scale of sewage collection and treatment of decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment;

[0203] Module for calculating the gap in centralized pollutant collection and treatment: used to calculate the gap in domestic sewage pollutant collection based on the amount of domestic sewage pollutants collected and the amount of domestic sewage pollutants generated; and to calculate the gap in centralized pollutant treatment based on the amount of domestic sewage pollutants generated, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering centralized sewage treatment facilities, and the centralized pollutant collection reduction rate.

[0204] As can be seen from the various embodiments listed above, the present invention provides a method for calculating the effective collection and treatment capacity of urban sewage. The method uses the collection area of ​​a centralized sewage treatment facility as a calculation unit. The total amount of influent pollutants is calculated, and the contribution of industrial and agricultural wastewater pollutants is deducted to obtain the amount of domestic sewage pollutants collected within the calculation unit. The sum of the domestic sewage pollutant collection amounts of each accounting unit is the total amount of domestic sewage pollutants collected in the calculation area. The total amount of centralized domestic sewage collected in the calculation area is calibrated by the calibration concentration of urban domestic sewage pollutants. The ratio of this result to the total amount of domestic sewage generated is the centralized domestic sewage collection rate in the calculation area. The ratio of the total amount of pollutant reduction in the sewage treatment plant in the calculation area to the sum of the regional domestic sewage pollutant generation and the total amount of industrial and livestock and poultry wastewater pollutants entering the sewage treatment plant is the regional centralized pollutant collection reduction rate. Furthermore, the method further calculates the domestic sewage collection gap and the pollutant centralized treatment gap, and determines whether the theoretical domestic sewage treatment capacity of the area meets the demand. The accounting method provided in the present invention application can objectively reflect the effective collection and treatment capacity and level of domestic sewage in urban areas, help to accurately investigate the basic data of sewage treatment, and provide technical support for improving the quality and efficiency of urban sewage treatment.

[0205] In a specific implementation, the present application further provides a computer storage medium, wherein the computer storage medium may store a program that, when executed, may include some or all of the steps of each embodiment of the method and apparatus for calculating the effective collection and treatment capacity of urban sewage provided in the present application. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0206] Those skilled in the art can clearly understand that the technology in the embodiments of the present application can be implemented by means of software plus the necessary general hardware platform. Based on this understanding, the technical solutions in the embodiments of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application or certain parts of the embodiments.

[0207] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0208] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for calculating the effective collection and treatment capacity of urban sewage, characterized in that: Taking the sewage collection range of the centralized sewage treatment facility as the accounting unit, after obtaining data analysis, the centralized domestic sewage collection rate and the centralized pollutant collection reduction rate are obtained, and the theoretical domestic sewage treatment capacity of the accounting unit is determined to obtain the domestic sewage collection gap, the domestic sewage pollutant collection gap, and the centralized pollutant treatment gap, including the following steps: S1: Obtain the influent and effluent data of the centralized sewage treatment facility, as well as the industrial wastewater data and livestock and poultry breeding wastewater data entering the centralized sewage treatment facility; S2: Calculate the pollutant collection amount of each according to the influent data of the centralized sewage treatment facility, the industrial wastewater data and the livestock and poultry breeding wastewater data entering the centralized sewage treatment facility, and obtain the pollutant collection amount of domestic sewage; S3: Calculating the centralized collection volume of domestic sewage based on the collected volume of domestic sewage pollutants; S4: Obtain the amount of domestic sewage generated; S5: Calculating a centralized collection rate of domestic sewage based on the centralized collection volume of domestic sewage and the generated volume of domestic sewage; S6: Calculating the amount of pollutant reduction based on the influent data and effluent data of the centralized sewage treatment facility; S7: Calculating the amount of domestic sewage pollutants generated based on the amount of domestic sewage generated; S8: Calculate a centralized pollutant collection reduction rate based on the amount of pollutants generated in the domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutants reduced; S9: Statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit, and compare it with the amount of domestic sewage generated. When the theoretical scale of centralized domestic sewage collection and treatment is greater than or equal to the amount of domestic sewage generated, it is determined that the theoretical domestic sewage treatment capacity of the accounting unit basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment is less than the amount of domestic sewage generated, it is determined that the theoretical domestic sewage treatment capacity of the accounting unit is insufficient. S10: Obtaining statistical data on the design scale of sewage collection and treatment at decentralized treatment facilities within the accounting unit, and calculating the domestic sewage collection gap based on the design scale of sewage collection and treatment at decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment; S11: Calculate the gap in domestic sewage pollutant collection based on the amount of domestic sewage pollutants collected and the amount of domestic sewage pollutants generated; calculate the gap in centralized pollutant treatment based on the amount of domestic sewage pollutants generated, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering centralized sewage treatment facilities, and the centralized pollutant collection reduction rate.

2. The calculation method according to claim 1, characterized in that: The pollutants are any one or more pollutants including COD, BOD5, ammonia nitrogen, total nitrogen, and total phosphorus.

3. The calculation method according to claim 1, characterized in that: In step S1, the centralized sewage treatment facility is a sewage treatment plant, and the influent data includes the daily influent volume and daily influent pollutant concentration of the sewage treatment plant; the effluent data includes the daily effluent pollutant concentration of the sewage treatment plant; The industrial wastewater data includes the volume and pollutant concentration of wastewater collected by each online-monitored industrial enterprise entering the sewage treatment plant within the accounting unit, and the average pollutant concentration of wastewater collected by enterprises without online monitoring; The livestock and poultry breeding wastewater data includes the discharge volume and pollutant concentration of each livestock and poultry breeding farm entering the sewage treatment plant within the accounting unit.

4. The calculation method according to claim 3, characterized in that: Taking COD as the pollutant accounting factor and one year as the accounting cycle, in step S2, calculating the respective pollutant collection amounts and obtaining the domestic sewage pollutant collection amount includes the following steps: S21, COD collection capacity of sewage treatment plant in M COD污水厂收集量 It is calculated according to the following formula: Among them, Q 进水，i and C 进水，i are the influent water volume and influent COD concentration of the sewage treatment plant on the i-th day of the accounting unit, and n is the total number of days in a year; S22, industrial wastewater COD collection volume in M COD工业收集量 It is calculated according to the following formula: Where: Q 工业企业，j and C 工业企业，j are the annual piped water volume and COD concentration of the jth online monitoring industrial enterprise in the accounting unit; m is the number of industrial enterprises in the accounting unit that have installed water volume and water quality automatic monitoring facilities at their pipe ports. 工业用水 The K is the sum of industrial water consumption among public water supply users, users with their own water sources and users who purchase steam. 工业污水排放系数 For the ratio of wastewater discharge to water consumption of enterprises without online monitoring within the accounting unit, the C 工业排水 is the average COD concentration of enterprises without online monitoring, and K 工业污水排放系数 and C 工业排水 Obtained through annual environmental statistics or pollution source census data respectively; S23, calculate the COD collection volume of livestock and poultry wastewater M according to the formula COD畜禽养殖收集量 : Where: Q 畜禽养殖排水，k and C 畜禽养殖排水，k are the annual sewage discharge volume and COD concentration of the kth livestock and poultry farm discharged into the sewage treatment plant, respectively; l is the number of livestock and poultry farms that discharge sewage into the sewage treatment plant in the accounting unit; S24, according to the M obtained in steps S21, S22, and S23 COD污水厂收集量 、M COD工业收集量 and M COD畜禽养殖收集量 , use the following formula to calculate the domestic sewage COD collection volume M COD生活收集量 : M COD生活收集量 =M COD污水厂收集量 -M COD工业收集量 -M COD畜禽养殖收集量 In step S3, the amount of domestic sewage collected is Q 生活集中收集 It is calculated according to the following formula: Q 生活集中收集 =M COD生活收集量 / C 生活校核浓度 Among them, M COD生活收集量 Obtained through step S24, C 生活校核浓度 For the COD calibration concentration of domestic sewage, select 260mg / L or 350mg / L; The amount of domestic sewage generated in step S4 is Q 生活污水产生 It is calculated according to the following formula: Q 生活污水产生 =(Q 公共供水，生活 +Q 自备水源，生活 )×K 生活污水产生系数 Among them, Q 公共供水，生活 Q is the total annual domestic water consumption from public water supply facilities within the accounting unit; 自备水源，生活 The total annual domestic water consumption from self-supplied water sources within the accounting unit; K 生活污水产生系数 The ratio of domestic sewage discharge to water consumption within the accounting unit is 0.8 to 0.9; In step S5, the centralized collection rate of domestic sewage is represented by R and is calculated according to the following formula: R=Q 生活集中收集 / Q 生活污水产生 。 5. The calculation method according to claim 4, characterized in that: include: In step S6, the pollutant reduction amount of the centralized sewage treatment facility is expressed as M COD处理削减量 It is calculated according to the following formula: Where: Q 进水，i 、C 进水，i and C 出水，i are the influent volume, influent COD concentration, and effluent COD concentration of the sewage treatment plant on the i-th day of the accounting unit, respectively, and n is the total number of days in a year; In step S7, the amount of domestic sewage pollutants generated is calculated based on the amount of domestic sewage generated obtained in step S4, and the amount of domestic sewage pollutants generated is expressed as M COD生活产生量 It is calculated according to the following formula: M COD生活产生量 =Q 生活污水产生 ×C 生活校核浓度 , where Q 生活污水产生 From step S4, C 生活校核浓度 Obtained from step S3; In step S8, the pollutant centralized collection reduction rate, represented by R', is calculated according to the following formula: R’=M COD处理削减量 / (M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 )。 6. The calculation method according to claim 5, characterized in that: Also includes: Calculate the centralized collection rate of domestic sewage in the urban accounting area and the centralized collection reduction rate of pollutants in the accounting area, respectively using R 区域 and R′ 区域 It is calculated according to the following formula: Among them, Q 生活集中收集，h Q is the centralized collection volume of domestic sewage in the hth accounting unit in the urban area. 生活污水产生，h is the amount of domestic sewage generated by the hth accounting unit in the urban area under calculation, and b is the number of accounting units in the urban area under calculation; Among them, M COD处理削减量，h is the pollutant reduction amount of the hth accounting unit in the urban area under calculation, M COD生活产生量，h M is the amount of domestic sewage pollutants generated in the hth accounting unit in the urban area under accounting, COD工业收集量，h is the amount of industrial wastewater pollutants collected by the hth accounting unit in the urban area under accounting, M COD畜禽养殖收集量，h is the amount of wastewater pollutants collected from livestock and poultry farms in the hth accounting unit within the urban area under accounting, and b is the number of accounting units within the urban area under accounting.

7. The calculation method according to claim 6, characterized in that: Also includes: In step S9, the theoretical scale of centralized domestic sewage collection and treatment in the accounting unit is obtained by statistics, and Q 生活集中处理理论规模 It is calculated according to the following formula: Q 生活集中处理理论规模 =Q 设计 -Q 工业排水 -Q 畜禽养殖排水 Among them, Q 设计 is the total design scale of the centralized sewage treatment plant; Q 工业排水 The annual water volume collected by industrial enterprises entering centralized sewage treatment plants is calculated using the following formula: Where: Q 工业企业，j ,m,Q 工业用水 , K 工业污水排放系数 All are obtained from step S22; Q 畜禽养殖排水 The annual water volume collected by livestock and poultry farms entering the centralized sewage treatment plant within the accounting unit is calculated using the following formula: Among them, l and Q 畜禽养殖排水，k All are obtained from step S23; In step S10, the design scale of sewage collection and treatment of decentralized treatment facilities in the accounting unit is obtained, and Q 分散处理 It is calculated according to the following formula: Q 分散式，x is the design scale of the xth decentralized sewage treatment facility in the accounting unit; c is the number of decentralized sewage treatment facilities in the accounting unit; Calculate the domestic sewage collection gap as Q 缺口 It is calculated according to the following formula: Q 缺口 =Q 生活污水产生 -Q 生活集中处理理论规模 -Q 分散处理 The amount of domestic sewage generated Q 生活污水产生 Obtained from step S4; In step S11, the COD collection gap of domestic sewage is M COD生活收集缺口量 It is calculated according to the following formula: M COD生活收集缺口量 =M COD生活产生量 -M COD生活收集量 Among them, M COD生活产生量 From step S7, M COD生活收集量 Obtained from step S24; The gap in COD centralized treatment is M COD处理缺口量 It is calculated according to the following formula: M COD处理缺口量 =(M COD生活产生量 +M COD工业收集量 +M COD畜禽养殖收集量 )×(1-R’)。 8. The calculation method according to claim 1, characterized in that: Also includes: The theoretical scale of centralized domestic sewage collection and treatment in each accounting unit within the urban area obtained by statistics is summed to obtain the theoretical scale of centralized domestic sewage collection and treatment in the accounting area, and the domestic sewage generation of each accounting unit is summed to obtain the domestic sewage generation in the area; When the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is ≥ the amount of domestic sewage generated in the area, it is judged that the theoretical treatment capacity of domestic sewage in the accounting area basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment in the accounting area is < the amount of domestic sewage generated in the area, it is judged that the theoretical treatment capacity of domestic sewage in the accounting area is insufficient.

9. The calculation method according to claim 1, characterized in that: Also includes: The calculated domestic sewage collection gap of each accounting unit in the urban area is summed up to obtain the regional domestic sewage collection gap; The calculated pollutant centralized collection and treatment gaps of each accounting unit within the urban area are summed up to obtain the regional pollutant centralized collection and treatment gaps.

10. A device for calculating the effective collection and treatment capacity of urban sewage, characterized in that: include: Sewage data input module, used to input the inlet and outlet data of centralized sewage treatment facilities, industrial wastewater data, and livestock and poultry breeding wastewater data; A pollutant collection amount calculation module, used to calculate the amount of domestic sewage pollutants collected based on the data obtained by the sewage input module; A sewage collection volume calculation module is used to calculate the domestic sewage collection volume based on the obtained domestic sewage pollutant collection volume; A sewage generation amount acquisition module is used to obtain the amount of domestic sewage generated; A sewage centralized collection rate calculation module, configured to calculate the domestic sewage centralized collection rate based on the domestic sewage collection volume and the domestic sewage generation volume; a pollutant reduction calculation module, configured to calculate the pollutant reduction based on the influent data and effluent data of the centralized sewage treatment facility; A domestic sewage pollutant generation amount calculation module is used to calculate the pollutant generation amount based on the domestic sewage generation amount; a pollutant reduction rate calculation module, configured to calculate a pollutant centralized collection reduction rate based on the amount of pollutants generated in the domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering the centralized sewage treatment facility, and the amount of pollutant reduction; The domestic sewage theoretical treatment capacity determination module is used to statistically obtain the theoretical scale of centralized domestic sewage collection and treatment within the accounting unit and compare it with the amount of domestic sewage generated. When the theoretical scale of centralized domestic sewage collection and treatment is greater than or equal to the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit basically meets the demand; when the theoretical scale of centralized domestic sewage collection and treatment is less than the amount of domestic sewage generated, it is determined that the domestic sewage theoretical treatment capacity of the accounting unit is insufficient; The domestic sewage collection gap calculation module is used to statistically obtain the sewage collection and treatment design scale of decentralized treatment facilities within the accounting unit, and calculate the domestic sewage collection gap based on the sewage collection and treatment design scale of decentralized treatment facilities, the amount of domestic sewage generated, and the theoretical scale of centralized domestic sewage collection and treatment; The pollutant centralized collection and treatment gap calculation module is used to calculate the domestic sewage pollutant collection gap based on the domestic sewage pollutant collection volume and the domestic sewage pollutant generation volume; The gap in centralized pollutant treatment is calculated based on the amount of pollutants generated in domestic sewage, the amount of pollutants collected from industrial wastewater and livestock and poultry breeding wastewater entering centralized sewage treatment facilities, and the centralized pollutant collection reduction rate.

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