Carbon emission accounting method in operation process of drainage project

Abstract

The invention relates to the field of carbon emission, in particular to a drainage project operation process carbon emission accounting method. The method comprises the steps of determining an accounting boundary, carbon emission and carbon offset types, acquiring activity data, selecting emission factors and calculating emission. Carbon emission in the whole process of sewage and rainwater collection and transportation, treatment, sludge disposal, tail water emission and the like can be checked, and biochemical direct emission, energy resource indirect emission and recycled carbon counteracting are involved. Activity data acquisition modes include field actual measurement and file acquisition, localization factors are preferentially selected as carbon emission factors, and accounting accuracy is ensured. The method is comprehensive and systematic, can provide powerful support for low-carbon operation of a drainage project, assists in defining the pollution reduction and carbon reduction direction, improves the energy resource management level, and fills the blank of an existing accounting method.

Description

Technical Field

[0001] The present invention relates to the field of carbon emissions, and specifically to a method for calculating carbon emissions during the operation of a drainage project. Background Art

[0002] Drainage engineering is a project that collects, transports, treats, regenerates and discharges sewage and rainwater, including rainwater systems and sewage systems. The rainwater system is a whole that is composed of facilities for infiltration, storage, collection, transportation, treatment, utilization and discharge of rainwater in a certain way, covering the whole process management from the generation of rainwater runoff to terminal discharge, as well as early warning and emergency measures. The sewage system is a whole that is composed of facilities for collecting, transporting, treating, regenerating and disposing of urban sewage and sludge in a certain way, covering the whole process management from sewage generation to terminal discharge and sludge disposal.

[0003] During the operation of drainage projects, carbon emissions will be generated from different sources, including direct emissions of greenhouse gases such as methane and nitrous oxide produced by biochemical reactions in sewage treatment and sludge treatment and disposal processes, as well as indirect emissions from energy consumption such as electricity and heat, water treatment chemicals, sludge treatment and disposal chemicals, and other resource consumption. The carbon emissions during the operation of drainage projects are characterized by a wide variety of greenhouse gases, complex emission sources, and high emission intensity. Their carbon emissions should be accurately calculated to provide basic data support for the industry's low-carbon and sustainable development, and to indicate the direction for further pollution reduction and carbon reduction.

[0004] Among the existing carbon emission accounting methods, there is no method that includes the entire drainage project operation process. For example, Zhang Jian et al. disclosed a sewage treatment control method, medium and equipment based on carbon emission accounting (CN118625674A), which is aimed at the control strategy based on the carbon emission accounting method of the sewage treatment link in the drainage project, but it does not include the carbon emission accounting method of the upstream link of sewage treatment, that is, the pipe network, nor does it include the carbon emission accounting of the downstream link of sewage treatment, that is, the sludge treatment and disposal process. The carbon emissions of these two upstream and downstream links are considerable and should not be ignored. Therefore, there is an urgent need for a carbon emission accounting method that can integrate all links of the drainage project operation process. Summary of the invention

[0005] The present invention provides a method for calculating carbon emissions during the operation of a drainage project, so as to solve the problem of lack of a systematic and complete method for calculating carbon emissions during the entire operation of a drainage project.

[0006] To achieve the above purpose, a method for calculating carbon emissions during the operation of a drainage project includes the following steps:

[0007] Step S1: Collect carbon emission data of each process of the drainage network to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions, so as to calculate the amount of carbon emissions;

[0008] Step S2: Collect carbon emission data from each treatment unit of sewage and reclaimed water treatment to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions, so as to calculate the amount of carbon emissions;

[0009] Step S3: Collect carbon emission data from the sludge treatment and disposal processes separately to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions.

[0010] Furthermore, in step S1:

[0011] Step S11: The carbon emissions from the septic tanks in the drainage network are direct carbon emissions, and the types of greenhouse gases emitted specifically include fossil-derived carbon dioxide and methane;

[0012] Step S12: The carbon emissions from the pipes in the drainage network are direct carbon emissions, and the types of greenhouse gases emitted specifically include fossil-derived carbon dioxide and methane;

[0013] Step s13: When the overflow of the pipe network is discharged on rainy days, the carbon emissions generated by runoff pollution include direct emissions and indirect emissions. The activity data of carbon emissions are counted and calculated respectively;

[0014] Step S14: Carbon emissions generated during the regular cleaning of drainage pipes and sludge construction materials, including indirect carbon emissions caused by energy and resource consumption and carbon offsets caused by the utilization of pipe sludge as construction materials;

[0015] Step S15: The carbon emissions caused by the operation of the drainage pump station include direct emissions from the pump station collection pool and indirect emissions from the operation of the pump station equipment.

[0016] Furthermore, in step S11:

[0017] Step s111: The calculation formula for the emission of fossil-based carbon dioxide in the septic tank is:

[0018]

[0019] In the formula, C hfc-CO2 is the carbon dioxide emission from fossil sources in septic tanks (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); EF Co2 is the carbon dioxide emission factor, kgCO2 / kg COD; N is the population served by the septic tank; V is the amount of sewage discharged per person per day, m 3 / (person·d); CODhfc，in COD concentration of septic tank influent, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average temperature of septic tank sewage, ℃; t is the hydraulic retention time of the septic tank, d.

[0020] Step s112: The methane emission from the septic tank can be calculated by collecting gas samples in a floating tank and then measuring the methane concentration in the sample; when the conditions for actual measurement are not available, the calculation can be performed according to a theoretical formula; which includes:

[0021] Step S1121: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the septic tank is:

[0022]

[0023] In the formula, C hfc-CH4 is the methane carbon emission from the septic tank (kgCO2 / a); r is the methane production rate (kg CH4 / (m 3 ·d)); V qy is the volume of the floating tank used for gas sampling (m 3 );A fhc is the cross-sectional area of ​​the septic tank (m 2 );A qy is the cross-sectional area of ​​the floating tank (m 2 ); GWP CH4 is the global warming potential of methane;

[0024] Step S1122: The methane emission in the septic tank is calculated by a theoretical formula:

[0025] C hfc-CH4 =EF CH4 ×q×COD hfc,in ×N×365×GWP CH4

[0026] In the formula, C hfc-CH4 is the methane carbon emission from septic tank (kgCO2 / a); EF CH4 is the methane emission factor, kg CH4 / kg COD; q is the sewage discharge equivalent, m 3 / (person·d); COD hfc，in COD concentration of septic tank influent, kg / m 3 ; GWP CH4 is the global warming potential of methane.

[0027] Further, in step S12:

[0028] Step S121: The calculation formula for the amount of carbon dioxide emitted from fossil fuels in the pipeline is:

[0029]

[0030] In the formula, C gq-CO2 is the carbon dioxide emission from fossil sources in pipelines (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); EF CO2 is the carbon dioxide emission factor, kgCO2 / kg COD; N is the population served by the calculated pipeline; V is the amount of sewage discharged per person per day, m 3 / (person·d); COD gq，in COD concentration of pipe inlet water, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average temperature of sewage in the canal, ℃; t is the residence time of sewage in the canal, d;

[0031] Step S122: The methane emission in the pipeline can be calculated by collecting gas samples and then measuring the methane concentration in the samples; when the conditions for actual measurement are not available, it can be calculated according to a theoretical formula; wherein:

[0032] Step S1221: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the pipeline is:

[0033] C gq，CH4 =C g，CH4 ×16×Q gq ×365×GWP CH4

[0034] In the formula, C gq，CH4 is the carbon emission of methane in pipelines, kgCO2 / a; C g，CH4 is the methane concentration in the gas in the pipeline, mol / L; 16 is the molecular weight of methane; Q gq is the average daily flow rate of sewage in the canal, m 3 / d;GWP CH4 is the global warming potential of methane;

[0035] Step S1222: The methane emission in the pipeline is calculated by the theoretical formula:

[0036] C gq-CH4 =0.419×1.06 T-20 ×Q gq 0.26 ×D 0.28 ×S -0.138 ×L×365

[0037] In the formula, C gq-CH4 is the methane carbon emission in the canal (kgCO2 / a); T is the average temperature of sewage in the canal, °C; Qgq is the sewage flow in the pipe, m 3 / s; D is the pipeline diameter, m; S is the pipeline slope, m / m; L is the pipeline length, km.

[0038] Further, in step S13:

[0039] Step S131: Direct emissions from runoff pollution into water bodies include emissions of methane and nitrous oxide; wherein:

[0040] Step S1311: The calculation formula for the methane emissions generated by runoff pollution discharged into the water body is:

[0041]

[0042] In the formula, C yl-CH4 It is the methane emission generated by runoff pollution after sewage or rainwater in the pipe network is discharged into natural water bodies, kgCO2e / a; COD yl，i is the organic matter concentration in sewage or rainwater when runoff pollution is discharged into natural water bodies for the i-th time, kg COD / m 3 ;Q yl，j is the amount of water discharged into natural water bodies for the i-th time, m 3 EF CH4 is the methane emission factor, kgCH4 / kg COD; GWP CH4 is the global warming potential of methane;

[0043] Step S1312: The calculation formula for nitrous oxide emissions is:

[0044]

[0045] In the formula, C yl-CH4 It is the methane emission generated by runoff pollution after sewage or rainwater in the pipe network is discharged into natural water bodies, kgCO2e / a; COD yl，i is the organic matter concentration in sewage or rainwater when runoff pollution is discharged into natural water bodies for the i-th time, kg COD / m 3 ;Q yl，i is the amount of water discharged into natural water bodies for the i-th time, m 3 EF CH4 is the methane emission factor, kgCH4 / kg COD; GWP CH4 is the global warming potential of methane;

[0046] Step S132: Indirect emissions caused by runoff pollution discharged into water bodies include carbon emissions caused by power consumption of equipment such as water pumps during overflow. The emission calculation formula is:

[0047]

[0048] In the formula, C vl-ii is the indirect carbon emission generated during overflow, (kgCO2 / a); AD yl-jj，i is the consumption of the i-th energy or resource during overflow (unit / a); EF i is the carbon emission factor of the ith energy or resource (kgCO2 / unit of measurement).

[0049] Further, in step S14:

[0050] Step S141: Indirect emissions generated during the regular cleaning of pipes and canals and the use of sludge as building materials, including carbon emissions generated by power consumption of equipment such as pumps and tap water consumption, calculated using the same formula as step 132;

[0051] Step S142: The carbon offset amount brought by the utilization of pipe sludge as building materials is calculated as follows:

[0052]

[0053] In the formula, C at-dx is the carbon offset generated by the use of sewage sludge as building materials, (kgCO2 / a); AD qt-dx，i The amount of the i-th building material made from canal sludge, unit of measurement / a; EF i is the carbon emission factor of the i-th building material during production (kgCO2 / unit of measurement).

[0054] Further, in step S15:

[0055] Step S151: Direct carbon emissions from the operation of the pump station include fossil-source carbon dioxide and methane that escape from the water collection pool; wherein:

[0056] Step S1511: The calculation formula for the amount of carbon dioxide emitted from fossil fuels in the water collection pool of the pump station is as follows:

[0057]

[0058] In the formula, C jsc-CO2 is the fossil-based carbon dioxide emission from the pump station water collection pool (kgCO2 / a); α is the proportion of fossil-based organic matter to all organic matter in sewage (%); EF CO2 is the carbon dioxide emission factor, kgCO2 / kg COD; V min is the volume corresponding to the lowest design water level of the water collection tank, m 3 ;COD jsc COD concentration of rainwater or sewage in the collection tank, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average water temperature of the pump station collection tank, ℃; t is the average residence time of rainwater or sewage in the collection tank at the minimum design water level, d.

[0059] Step S1512: The methane emission from the water collection tank of the pump station can be calculated by collecting gas samples in a floating tank and then measuring the methane concentration in the samples; when the conditions for actual measurement are not available, the calculation can be performed according to a theoretical formula, where:

[0060] Step S15121: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the pump station sump is as follows:

[0061]

[0062] In the formula, C jsc-CH4 is the methane carbon emission from the water collection pool, (kgCO2 / a); r is the methane production rate, (kg CH4 / (m 3 ·d)); V qy is the volume of the flux box used for sampling (m 3 );A jsc is the area of ​​the water collection tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP CH4 is the global warming potential of methane.

[0063] Step S15122: When the methane concentration cannot be obtained through on-site measurement, the methane emission calculation formula of the pump station sump is as follows:

[0064] C jsc-CH4 =EF CH4 ×COD jsc ×V min ×GWP CH4 ×365

[0065] In the formula, C jsc-CH4 is the methane carbon emission of the water collection pool, (kgCO2 / a); EF CH4 is the emission factor of methane, kg CH4 / kg COD; COD jsc is the average COD concentration in the water collection pool, kg / (m 3 ·d); V mm is the volume corresponding to the lowest design water level of the water collection tank, m 3 ; GWP CH4 is the global warming potential of methane;

[0066] Step S152: Indirect emissions generated by the operation of the pump station, including carbon emissions generated by electricity consumption of equipment such as pumps and tap water consumption, are calculated using the same formula as step S132.

[0067] Furthermore, in step S2:

[0068] Step S21: The carbon emissions of the primary treatment unit include direct emissions from methane evaporation, indirect emissions from purchased electricity and chemicals, and consumption of tap water;

[0069] Step S22: The secondary treatment unit mainly undergoes a biochemical treatment process, and carbon emissions include direct carbon emissions and indirect carbon emissions;

[0070] Step S23: The main processes of deep and regeneration treatment include coagulation, sedimentation, filtration, disinfection, activated carbon adsorption, membrane filtration, and ozone oxidation. Carbon emissions include indirect carbon emissions generated by purchased electricity, chemicals, and material consumption. The calculation formula is the same as that of step S132;

[0071] Step S24: The carbon emissions of the tailwater discharged after treatment are direct carbon emissions of methane and nitrous oxide (kgCO2 / a);

[0072] Step S25: The carbon offset of the sewage and recycled water treatment process includes the carbon emissions of the recovered energy and resources in the production process, and the calculation formula is:

[0073]

[0074] In the formula, C ws-dx is the carbon offset in the sewage and recycled water treatment process (kgCO2 / a); AD ws-dx，i is the amount of energy or resource recovered from the i-th type (unit / a); EF i is the carbon emission factor of the ith energy or resource (kgCO2 / unit of measurement).

[0075] Further, in step S21:

[0076] Step S211: Direct carbon emissions from methane escape during the primary treatment process should be calculated as follows:

[0077] C cj-CH4 =f CH4 ×Q×(COD in -COD out )×EF CH4 ×10 -3 ×365

[0078] In the formula, C cj-CH4 is the direct carbon emission from methane escape during the primary treatment process, kgCO2 / a; f CH4 is the ratio of methane released from the primary treatment process to methane emitted from the biochemical reaction process, %; Q is the average daily water inflow of the sewage treatment plant, m 3 / d;COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EFCH4 is the emission factor of methane, kgCH4 / kg COD;

[0079] Step S212: The indirect carbon emissions of the primary treatment unit include the carbon emissions generated by equipment power consumption, chemicals and tap water consumption, and the calculation formula is the same as step 132.

[0080] Further, in step S22:

[0081] Step S221: The direct carbon emissions of the secondary treatment unit include the emissions of fossil carbon dioxide, the carbon emissions during the mineralization process of the added carbon source, the emissions of methane, and the emissions of nitrous oxide; wherein:

[0082] Step S2211: The emission of fossil-based carbon dioxide from the secondary processing unit is calculated using the formula:

[0083] C sh-CO2 =α×Q in ×(COD in -COD out )×EF CO2 ×10 -3 ×365

[0084] In the formula, C sh-CO2 is the carbon emission of the secondary treatment unit, (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); Q is the average daily inflow of the sewage plant, m 3 / d;COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EF CO2 CO2 emission factor from fossil sources in wastewater, kgCO2 / kg COD;

[0085] Step S2212: The carbon emissions generated by the secondary treatment unit and the carbon source mineralization process are calculated as follows:

[0086] C ty-CO2 =M ty ×EF ty，CO2 ×365

[0087] In the formula, C ty-CO2 is the carbon emission generated by mineralization of external carbon source, kgCO2 / a; M ty Daily amount of carbon source added to the sewage treatment plant, kg / d; EF ty-CO2 is the carbon emission factor of the added carbon source, kgCO2 / kg;

[0088] Step S2213: The carbon emissions of methane from the secondary treatment unit can be calculated by collecting gas samples on site and measuring the gas concentration using the closed flux box method, open flux box method or tail gas method according to the characteristics and operating status of the treatment unit; when the direct carbon emissions cannot be calculated using the actual measurement method, the emission factor method can be used, where:

[0089] Step S22131: The methane emitted from the non-sealed reactor in a non-aerated state can be collected using a closed flux box method, and the emission amount is calculated using the following formula:

[0090]

[0091] In the formula, C bstlx-CH4 is the methane carbon emission calculated by the closed flux box method, (kgCO2 / a); r CH4 is the methane production rate, (kg CH4 / (m 3 ·d)); V qy is the volume of the closed flux box used for sampling, (m 3 );A fyc is the cross-sectional area of ​​the reaction tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP CH4 is the global warming potential of methane;

[0092] Step S22132: The methane emitted from the non-closed reactor under aeration can be collected using the open flux box method, and the emission is calculated using the following formula:

[0093]

[0094] In the formula, C kstlx-CH4 is the methane carbon emission calculated by the open flux box method, (kgCO2 / a); Q g is the aeration volume, m 3 / h; C CH4 is the methane concentration in the gas, kg / m 3 ; A bqc is the cross-sectional area of ​​the aeration tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 );t bq is the daily aeration time, h; GWP CH4 is the global warming potential of methane;

[0095] Step S22133: The methane in the full coverage reactor can be collected by tail gas method to calculate the carbon emissions. The calculation formula is:

[0096] Cwq-CH4 =Q wq ×C CH4 ×24×365×GWP CH4

[0097] In the formula, C wq-CH4 is the methane carbon emission calculated based on the tail gas method, (kgCO2 / a); Q wq is the exhaust gas flow rate, m 3 / h; C CH4 is the methane concentration in the gas, kg / m 3 ; GWP CH4 is the global warming potential of methane;

[0098] Step S22134: The methane carbon emissions based on the emission factor method are calculated using the formula:

[0099]

[0100] In the formula, C yz-CH4 is the methane carbon emission calculated based on the factor method, (kgCO2 / a); COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; m is the sludge production, t / d; θ is the sludge moisture content, %; σ is the organic component content in the sludge, %; EF CH4 is the methane emission factor, kg CH4 / kg COD; is the sludge methane correction factor; Q is the sewage treatment volume, m 3 / d;GWP CH4 is the global warming potential of methane;

[0101] Step S2214: The carbon emissions of nitrous oxide from the secondary treatment unit can be calculated by collecting gas samples on site and measuring the gas concentration using the closed flux box method, open flux box method or tail gas method according to the characteristics and operating status of the treatment unit; when the actual measurement method cannot be used to calculate the direct carbon emissions, the emission factor method can be used, where:

[0102] Step S22141: The nitrous oxide emitted from the non-sealed reactor in a non-aerated state can be collected using a closed flux box method, and the emission amount is calculated using the following formula:

[0103]

[0104] In the formula, C bstlx-N2O is the nitrous oxide carbon emission calculated by the closed flux box method, (kgCO2 / a); r N2O is the rate of nitrous oxide production, (kg N2O / (m 3 ·d)); Vqy is the volume of the closed flux box used for sampling, (m 3 );A fyc is the cross-sectional area of ​​the reaction tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP N2O is the global warming potential of nitrous oxide;

[0105] Step S22142: The nitrous oxide emitted from the non-closed reactor under aeration can be collected using the open flux box method to calculate the carbon emissions. The calculation formula is:

[0106]

[0107] In the formula, C kstlx-N2O is the nitrous oxide carbon emission calculated by the open flux box method, (kgCO2 / a); C N2O is the concentration of nitrous oxide in the gas, kg / m 3 ; A bqc is the cross-sectional area of ​​the aeration tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 );t bq is the daily aeration time, h; GWP N2O is the global warming potential of nitrous oxide;

[0108] Step S22143: The nitrous oxide in the full coverage reactor can be collected by tail gas method to calculate the carbon emission. The calculation formula is:

[0109] C wq-N2O =Q wq ×C N2O ×24×365×GWP N2O

[0110] In the formula, C wq-N2O is the nitrous oxide carbon emission calculated based on the tail gas method, (kgCO2 / a); Q wq is the exhaust gas flow rate, m 3 / h; C N2O is the concentration of nitrous oxide in the gas, kg / m 3 ; GWP N2O is the global warming potential of nitrous oxide;

[0111] Step S22144: The calculation formula for nitrous oxide carbon emissions based on the emission factor method is:

[0112] C yz-N2O =(TN in -TN out )×EFN2O ×Q×365×GWP N2O

[0113] In the formula, C yz-N2O is the nitrous oxide carbon emission calculated based on the factor method, (kgCO2 / a); TN in is the total nitrogen concentration in the inlet water, kgTN / m 3 TN out is the total nitrogen concentration in the effluent, kg TN / m 3 EF N2O is the nitrous oxide emission factor, kg N2O / kg TN; Q is the sewage treatment volume, m 3 / d;GWP N2O is the global warming potential of nitrous oxide;

[0114] Step S222: The indirect carbon emissions of the secondary treatment unit include the carbon emissions generated by equipment power consumption, chemicals and tap water consumption, and the calculation formula is the same as step S132.

[0115] Further, in step S24:

[0116] Step S241: The tail water discharged after treatment, the methane carbon emission, is calculated by the formula:

[0117] C st-CH4 =(COD in -COD out )×EF CH4 ×Q×365×GWP CH4

[0118] In the formula, C st-CH4 is the methane carbon emission of the tailwater after treatment (kgCO2 / a); COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EF CH4 is the methane emission factor, kg CH4 / kg COD; Q is the tail water discharge, m 3 / d;GWP CH4 is the global warming potential of methane.

[0119] Step S242: The calculation formula for the nitrous oxide carbon emission in the tail water after treatment is:

[0120] C yz-N2O =(TN in -TN out )×EF N2O ×Q×365×GWP N2O

[0121] In the formula, Cyz-N2O is the nitrous oxide carbon emission of the tail water after treatment (kgCO2 / a); TN in is the influent COD concentration, mg / L; TN out is the effluent COD concentration, mg / L; EF N2O is the nitrous oxide emission factor, kg N2O / kg TN; Q is the tailwater discharge, m 3 / d;GWP N2O is the global warming potential of methane.

[0122] Furthermore, in step S3:

[0123] Step S31: The sludge treatment process includes concentration and dehydration, transportation and storage, anaerobic digestion, aerobic composting, incineration and deodorization, and the carbon emission data are collected separately to clarify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions;

[0124] Step S32: The sludge disposal process includes building material utilization, land utilization, and sanitary landfill, and the carbon emission data are collected separately to clarify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions;

[0125] Step S33: The carbon offset of the sludge treatment and disposal process includes the carbon emissions of the recovered energy and resources in the production process, and the calculation formula is the same as step S25.

[0126] Further, in step S31:

[0127] Step S311: The carbon emissions generated by sludge concentration and dehydration are indirect carbon emissions generated by purchased electricity and chemicals, and the calculation formula is the same as step 132;

[0128] Step S312: Calculation of carbon emissions from sludge transportation and storage includes direct carbon emissions from methane released by biochemical reactions during transportation and storage and indirect carbon emissions from purchased electricity and materials, where:

[0129] Step S3121: Direct carbon emissions from sludge transportation and storage are calculated as follows:

[0130] C sszc-zj =AD cc ×EF sszc,CH4 ×365×GWP CH4

[0131] In the formula, C sszc-zj is the direct carbon emission from sludge transportation and storage process (kgCO2 / a); AD cc is the sludge transportation and storage volume (tDS / d); EF sszc，CH4Methane emission factor for sludge transportation and storage (kgCO2 / tDS); GWP CH4 is the global warming potential of methane;

[0132] Step S3122: Indirect carbon emissions during sludge transportation and storage, calculated using the same formula as step S132;

[0133] Step S313: The carbon emissions from the anaerobic digestion process of sludge include direct carbon emissions from methane released during the biochemical process and indirect carbon emissions from purchased electricity and chemicals, where:

[0134] Step S3131: Direct carbon emissions from anaerobic sludge digestion are calculated as follows:

[0135] C yyxh-zj =AD yyxh ×EF yyxh-CH4 ×365×GWP CH4

[0136] In the formula, C yyxh-zj is the direct carbon emission from anaerobic digestion of sludge (kgCO2 / a); AD yyxh is the amount of sludge treated by anaerobic digestion (tDS / d); EF yyxh-CH4 is the methane carbon emission factor for anaerobic digestion (kgCH4 / tDS); GWP CH4 is the global warming potential of methane;

[0137] Step S3132: indirect carbon emissions during anaerobic digestion of sludge, calculated using the same formula as step S132;

[0138] Step S314: The carbon emissions from the aerobic fermentation process of sludge include direct carbon emissions from methane and nitrous oxide released in the biochemical process, and indirect carbon emissions from purchased electricity and chemicals, where:

[0139] Step S3141: The carbon emission of methane generated during the aerobic fermentation of sludge is calculated as follows:

[0140] C hyfj-CH4 =AD hyfj ×EF fyfj-CH4 ×365×GWP CH4

[0141] In the formula, C hyfj-CH4 is the carbon emission of methane during aerobic fermentation of sludge (kgCO2 / a); AD hyfj is the amount of sludge treated by aerobic fermentation (tDS / d); EF hyfj-CH4 is the methane carbon emission factor for aerobic fermentation (kgCH4 / tDS); GWP CH4 is the global warming potential of methane;

[0142] Step S3142: The carbon emission of nitrous oxide generated during the aerobic fermentation of sludge is calculated as follows:

[0143] C hyfj-N2O =AD hyfj ×EF fyfj -N 2O ×365×GWP N2O

[0144] In the formula, C hyfj-N2O is the carbon emission of nitrous oxide during aerobic fermentation of sludge (kgCO2 / a); AD hyfj is the amount of sludge treated by aerobic fermentation (tDS / d); EF hyfj-CH4 is the nitrous oxide carbon emission factor of the aerobic fermentation process (kgCH4 / tDS); GWP N2O is the global warming potential of nitrous oxide;

[0145] Step S3143: indirect carbon emissions during the sludge aerobic fermentation process, calculated using the same formula as step S132;

[0146] Step S315: The calculation of carbon emissions from sludge incineration should include direct carbon emissions from fossil sources of carbon dioxide, methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including:

[0147] Step S3151: The calculation formula for fossil-based carbon dioxide emissions during sludge incineration is:

[0148] C fs-CO2 =β×AD fs ×EF fs-CO2 ×365

[0149] In the formula, C fs-CO2 is the carbon emission of fossil carbon dioxide generated by sludge incineration (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge (%); AD FS is the amount of sludge incinerated (tDS / d); EF fs-CO2 is the carbon dioxide emission factor from fossil sources (kgCO2 / tDS);

[0150] Step S3152: The methane emission during sludge incineration is calculated as follows:

[0151] C fs-CH4 =AD fs ×EF fs-CH4 ×365×GWP CH4

[0152] In the formula, C fs-CH4is the carbon emission of methane produced by sludge incineration, (kgCO2 / a); AD FS is the amount of sludge incinerated (tDS / d); EF fs-CH4 is the methane emission factor of the incineration process (kg CH4 / tDS); GWP CH4 is the global warming potential of methane;

[0153] Step S3153: The nitrous oxide emissions during the sludge incineration process are calculated using the formula:

[0154] C fs-N2O =AD fs ×EF fs-N2O ×365×GWP N2O

[0155] In the formula, C fs-N2O is the carbon emission of nitrous oxide produced by sludge incineration, (kgCO2 / a); AD FS is the amount of sludge incinerated (tDS / d); EF fs-N2O is the emission factor of nitrous oxide in the incineration process (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide;

[0156] Step S3154: indirect carbon emissions during sludge incineration, calculated using the same formula as step S132;

[0157] Step S316: The calculation of carbon emissions generated by deodorization during the sludge treatment process should include direct carbon emissions of methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, among which:

[0158] Step S3161: The methane carbon emissions generated by the deodorization process of the sludge treatment are calculated as follows:

[0159] C cc-CH4 =AD cc ×EF cc-CH4 ×365×GWP CH4

[0160] In the formula, C cc-CH4 Carbon emissions of methane produced by sludge deodorization process, (kgCO2 / a); AD cc is the sludge treatment capacity (tDS / d); EF cc-CH4 is the emission factor of deodorized methane in the sludge treatment process (kg CH4 / tDS); GWP CH4 is the global warming potential of methane;

[0161] Step S3162: The nitrous oxide carbon emissions generated by the deodorization process of the sludge treatment are calculated as follows:

[0162] Ccc-N2O =AD cc ×EF cc-N2O ×365×GWP N2O

[0163] In the formula, C cc-N2O Carbon emissions of nitrous oxide produced during sludge treatment deodorization, (kgCO2 / a); ADc c is the sludge treatment capacity (tDS / d); EF cc-N2O Emission factor for nitrous oxide from sludge treatment process (kg CH4 / tDS); GWP N2O is the global warming potential of nitrous oxide;

[0164] Step S3163: The indirect carbon emissions from deodorization during the sludge treatment process are calculated using the same formula as step S132.

[0165] The method for calculating carbon emissions during operation of a drainage project according to claim 12 is characterized in that, in step S32:

[0166] Step S321: The carbon emissions from the use of sludge as building materials shall include direct carbon emissions from fossil-based carbon dioxide, methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including:

[0167] Step S3211: The calculation formula for the carbon dioxide emissions from fossil sources of sludge building materials is:

[0168] C jc-CO2 =β×AD jc ×EF jc-CO2 ×365

[0169] In the formula, C jc-CO2 is the carbon emission of fossil carbon dioxide generated by the use of sludge as building materials (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge (%); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-CO2 is the carbon dioxide emission factor from fossil sources (kgCO2 / tDS);

[0170] Step S3212: The methane emissions from the use of sludge as building materials are calculated using the formula:

[0171] C jc-CH4 =AD jc ×EF jc-CH4 ×365×GWP CH4

[0172] In the formula, C jc-CH4 is the carbon emission of methane generated by the use of sludge as building materials, (kgCO2 / a); AD jcThe amount of sludge disposed for building materials utilization (tDS / d); EF jc-CH4 Emission factor of methane used in building materials (kg CH4 / tDS); GWP CH4 is the global warming potential of methane;

[0173] Step S3213: The calculation formula for nitrous oxide emissions from the use of sludge building materials is:

[0174] C jc-N2O =AD jc ×EF jc-N2O ×365×GWP N2O

[0175] In the formula, C jc-N2O is the carbon emission of nitrous oxide generated by the use of sludge as building materials, (kg CO2e / a); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-N2O Emission factor for nitrous oxide used in building materials (kg N2O / tDS); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-N2O Emission factor for nitrous oxide used in building materials (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide;

[0176] Step S3114: Indirect carbon emissions from the use of sludge as building materials, calculated using the same formula as step S132;

[0177] Step S322: Carbon emissions from sludge land use should include direct carbon emissions of methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including:

[0178] Step S3221: The calculation formula for methane emissions from sludge land use is:

[0179] C td-CH4 =AD td ×EF td-CH4 ×365×GWP CH4

[0180] In the formula, C td-CH4 is the carbon emission of methane generated by land use of sludge, (kgCO2 / a); AD td is the amount of sludge disposed of on land (tDS / d); EF td-CH4 is the emission factor of methane from land use (kg CH4 / tDS); GWP CH4 is the global warming potential of methane;

[0181] Step S3222: The calculation formula for nitrous oxide emissions from sludge land use is:

[0182] C td-N2O =AD td ×EF td-N2O ×365×GWP N2O

[0183] In the formula, C td-N2O is the carbon emission of nitrous oxide generated by land use of sewage sludge, (kg CO2e / a); AD td is the amount of sludge disposed of on land (tDS / d); EF td-N2O is the emission factor of nitrous oxide from land use (kg N2O / tDS); AD td is the amount of sludge disposed of on land (tDS / d); EF td-N2O is the emission factor of nitrous oxide from land use (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide;

[0184] Step S3223: Indirect carbon emissions from sludge land use, calculated using the same formula as step S132;

[0185] Step S323: The carbon emissions from sludge sanitary landfill should include direct carbon emissions from fossil carbon dioxide and methane, and indirect carbon emissions from purchased electricity and materials, including:

[0186] Step S3231: The calculation formula for fossil-based carbon dioxide emissions generated by sludge sanitary landfill is:

[0187] C tm-CO2 =β×AD ta ×EF tm-CO2 ×365

[0188] In the formula, C tm-CO2 is the carbon dioxide emission from sludge sanitary landfill, (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge, (%); AD tm The amount of sludge in sanitary landfill (tDS / d); EF td-CO2 is the CO2 emission factor for sanitary landfill (kg CH4 / tDS);

[0189] Step S3232: The methane emission from sludge sanitary landfill is calculated as follows:

[0190]

[0191] In the formula, C tm-CH4 is the carbon emission of methane produced by sludge sanitary landfill, (kg CO2e / a); AD tmis the amount of sludge disposed of in sanitary landfills, (tDS / d); DOC is the proportion of degradable organic carbon, 0.5kgC / kgDS; DOC f is the proportion of degradable organic carbon after decomposition, (%); MCF is the methane correction factor; F is the proportion of methane in landfill gas, (%); R is the proportion of methane recovered from landfill gas, (%); OX is the oxidation factor; GWP CH4 is the global warming potential of methane;

[0192] Step S3233: Indirect carbon emissions from sludge sanitary landfill, calculated using the same formula as step S132.

[0193] Correspondingly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the carbon emission accounting method for the operation process of the drainage project are implemented.

[0194] Correspondingly, the present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored, characterized in that when the computer program is executed by a processor, the steps of the carbon emission accounting method during the operation of the drainage project are implemented.

[0195] The present invention has the following beneficial technical effects:

[0196] The present invention covers the entire operation process of drainage engineering, including drainage pipe network (septic tank, drainage pipes, rainy day overflow, pipe cleaning and sludge building material utilization, drainage pump station operation), sewage and recycled water treatment, sludge treatment and disposal, etc., comprehensively considering the carbon emission sources and carbon offset types in each link, and can provide complete carbon emission accounting results. The specific situation of carbon emissions in each link such as primary treatment unit, secondary treatment unit, deep and regeneration treatment unit, etc., including different types of direct emissions (such as methane, nitrous oxide, fossil carbon dioxide emissions, etc. generated by biochemical processes) and indirect emissions (emissions generated by energy and resource consumption), lays the foundation for accurate accounting.

[0197] Detailed consideration of carbon offsets generated by energy and resource recovery during sewage and recycled water treatment, sludge treatment and disposal (such as calculation of carbon emissions from recycled energy and resources in the production process) in accounting will help promote the rational use and management of energy and resources, improve utilization efficiency, and reduce the overall carbon emissions of the project.

[0198] The present invention provides two methods: on-site measurement (such as measuring methane concentration by collecting gas samples in floating boxes) and running report files to obtain activity data, which can adapt to different project conditions, ensure data accuracy and reliability, and improve accounting accuracy. The localization factor is preferentially used to calculate carbon emissions, fully considering the impact of regional differences on carbon emissions, so that the accounting results are more in line with the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0199] Figure 1 A diagram showing the steps for calculating carbon emissions from a drainage project according to an embodiment of the present invention;

[0200] Figure 2 A diagram of carbon emission sources and carbon offset types and calculation steps for a drainage network in one embodiment of the present invention;

[0201] Figure 3 A diagram of the sewage and reclaimed water treatment emission sources, carbon offset types and calculation steps in one embodiment of the present invention;

[0202] Figure 4 A diagram of sludge treatment and disposal emission sources, carbon offset types and calculation steps for one embodiment of the present invention;

[0203] Figure 5 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0204] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0205] The present invention integrates all aspects of the drainage project operation process and proposes a systematic carbon emission accounting method. The carbon emission accounting methods of different links such as pipeline network, sewage treatment, sludge treatment and disposal, and discharged water bodies are considered. Carbon emission sources include direct emissions and indirect emissions, and carbon offsets include carbon offsets generated by energy and resource recovery. Through the method disclosed in the present invention, the complete results of the carbon emission accounting of the drainage project operation process can be obtained, providing basic data support for the industry's pollution reduction and carbon reduction, and helping to achieve low-carbon development.

[0206] Example 1

[0207] This embodiment proposes a method for calculating carbon emissions from septic tanks in a drainage network. The specific steps are as follows:

[0208] Step S11: determining that the carbon emission source in the septic tank is the direct emission of fossil carbon dioxide and methane;

[0209] Step S111: Calculate the carbon emissions of fossil-based carbon dioxide in septic tanks using the following formula:

[0210]

[0211] In the formula,

[0212] C hfc-CO2 is the carbon dioxide emission from fossil sources in septic tanks (kgCO2 / a);

[0213] α is the proportion of fossil organic matter to all organic matter in sewage (%), which is taken as 10%;

[0214] EF CO2 is the carbon dioxide emission factor, taking 0.4kgCO2 / kg COD;

[0215] N is the population served by the septic tank, which is 1000;

[0216] V is the amount of sewage discharged per person per day, 0.2m 3 / (person·d);

[0217] COD hfc，in COD concentration of septic tank inlet water, 0.3kg / m 3 ;

[0218] η 20 is the anaerobic conversion rate of organic matter at 20°C, taken as 0.221;

[0219] ε is the correction factor, which is 1.117

[0220] T is the average temperature of septic tank sewage, which is 20°C;

[0221] t is the hydraulic retention time of the septic tank, which is 1 day.

[0222] Substituting into the above formula, we can calculate that the carbon dioxide emissions from fossil sources are 159kgCO2 / a.

[0223] Step S1121: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the septic tank is:

[0224]

[0225] In the formula, C hfc-CH4 is the methane carbon emission from septic tank (kgCO2 / a);

[0226] r is the methane production rate, which is 0.01 kg CH4 / (m 3 d);

[0227] V qy is the volume of the floating box used for gas sampling, taken as 0.01m 3 ;

[0228] A fhc is the cross-sectional area of ​​the septic tank, take 10m2 ;

[0229] A qy is the cross-sectional area of ​​the floating tank, 0.0314m 2 ;

[0230] GWP CH4 is the global warming potential of methane, which is taken as 28;

[0231] Substituting into the above formula, the calculated methane carbon emissions are 325kgCO2 / a.

[0232] The total carbon emissions from the septic tank are 484kgCO2 / a.

[0233] Example 2

[0234] This embodiment proposes a method for calculating carbon emissions from a sewage treatment plant, and the specific steps are as follows:

[0235] Step S2: Determine the carbon emissions of the sewage treatment plant, including direct emissions from greenhouse gases released by biochemical processes during the operation of each treatment unit, indirect emissions from purchased energy and resources during the treatment process, and carbon offsets from energy and resources recovered from sewage.

[0236] Step S211: Direct carbon emissions from methane escape during the primary treatment process should be calculated as follows:

[0237] C cj-CH4 =f CH4 ×Q×(COD in -COD out )×EF CH4 ×10 -3 ×365×GWP CH4

[0238] In the formula,

[0239] C cj-CH4 is the direct carbon emission from methane escape during the primary treatment process, kgCO2 / a; f CH4 The ratio of methane emitted from the primary treatment process to methane emitted from the biochemical reaction process is taken as 20%;

[0240] Q is the average daily water inflow of the sewage treatment plant, 300,000m 3 / d;

[0241] COD in is the influent COD concentration, 300 mg / L;

[0242] COD out is the effluent COD concentration, 10 mg / L;

[0243] EF CH4is the emission factor of methane, taking 0.25kg CH4 / kg COD;

[0244] GWP CH4 is the global warming potential of methane, which is taken as 28;

[0245] Substituting into the above formula, the direct carbon emissions of the primary treatment unit are calculated to be 4.46×10 8 kgCO2 / a.

[0246] Step S212: Calculate the indirect carbon emissions of the primary processing unit, and the power consumption of the equipment is 0.05 kWh / m 3 The electricity emission factor is 0.5586 kgCO2 / kWh, and the carbon emissions are 3.06×10 7 kgCO2 / a.

[0247] Step S2211: The emission of fossil-based carbon dioxide from the secondary processing unit is calculated using the formula:

[0248] C sh-CO2 =α×Q in ×(COD in -COD out )×EF CO2 ×10 -3 ×365

[0249] In the formula, C sh-CO2 is the carbon emission of the secondary treatment unit, (kgCO2 / a);

[0250] α is the proportion of fossil-derived organic matter to all organic matter in sewage, 20%;

[0251] Q is the average daily water inflow of the sewage treatment plant, 300,000m 3 / d;

[0252] COD in is the influent COD concentration, 300 mg / L;

[0253] COD out is the effluent COD concentration, 10 mg / L;

[0254] EF CO2 CO2 emission factor from fossil sources in sewage, 0.4kg CO2 / kg COD;

[0255] Substituting into the above formula, the carbon emission of secondary treatment methane is calculated to be 2.54×10 7 kgCO2 / a.

[0256] Step S2212: The carbon emissions generated by the secondary treatment unit and the carbon source mineralization process are calculated as follows:

[0257] C ty-CO2 =M ty ×EF ty，CO2 ×365

[0258] In the formula, C ty-CO2 is the carbon emission generated by mineralization of external carbon source, kgCO2 / a;

[0259] M ty The daily amount of carbon source added to the sewage treatment plant is 24640 kg sodium acetate / d;

[0260] EF ty-CO2 is the carbon emission factor of the added carbon source, and the emission factor of sodium acetate is 0.74 kgCO2 / kg;

[0261] Substituting into the above formula, the carbon emission generated by the mineralization process of the secondary treatment unit plus carbon source is calculated to be 6.6610 7 kgCO2 / a.

[0262] Step S22134: The methane carbon emissions based on the emission factor method are calculated using the formula:

[0263]

[0264] In the formula, C yz-CH4 is the methane carbon emission calculated based on the factor method, (kgCO2 / a);

[0265] COD in is the influent COD concentration, 300 mg / L;

[0266] COD out is the effluent COD concentration, 10 mg / L;

[0267] m is the sludge production, 218t / d;

[0268] θ is the sludge moisture content, 75%;

[0269] δ is the content of organic components in sludge, 60%;

[0270] σ is the conversion coefficient between sludge TS and COD, 1.42 kg COD / kg TS;

[0271] is the methane correction factor, 0.003;

[0272] EF CH4 is the methane emission factor, 0.25kg CH4 / kg COD;

[0273] Q is the sewage treatment capacity, 300000m 3 / d;

[0274] GWP CH4 is the global warming potential of methane, 28;

[0275] Substituting into the above formula, the carbon emission of secondary treatment methane is calculated to be 3.12×10 6 kgCO2 / a.

[0276] S22144: Nitrous oxide carbon emissions based on the emission factor method, calculated as follows:

[0277] C yz-N2O =(TN in -TN out )×EF N2O ×Q×365×GWP N2O

[0278] In the formula, C yz-N2O is the nitrous oxide carbon emissions calculated based on the factor method, (kgCO2 / a);

[0279] TN in is the total nitrogen concentration in the inlet water, 0.036kg TN / m 3 ;

[0280] TN out is the total nitrogen concentration of the effluent, 0.0096kg TN / m 3 ;

[0281] EF N2O is the nitrous oxide emission factor, 0.016 kg N2O / kg TN;

[0282] Q is the sewage treatment capacity, 300000m 3 / d;

[0283] GWP N2O global warming potential for nitrous oxide, 265;

[0284] Substituting into the above formula, the carbon emission of secondary treatment nitrous oxide is calculated to be 1.23×10 8 kgCO2 / a

[0285] Step S222: The indirect carbon emissions of the secondary treatment unit include the carbon emissions generated by equipment power consumption, chemicals and tap water consumption, and the calculation formula is the same as step S132.

[0286] The power consumption of the equipment is 0.45kWh / m 3 The electricity emission factor is 0.5586 kgCO2 / kWh, and the carbon emissions are 2.75×10 8 kgCO2 / a;

[0287] The sodium acetate consumption is 8993.716t / a, the carbon emission factor is 2900kgCO2 / t, and the carbon emission is 2.61×10 7 kgCO2 / a;

[0288] The PAC consumption is 16497.07t / a, the carbon emission factor is 1620kgCO2 / t, and the carbon emission is 2.67×10 7 kgCO2 / a;

[0289] The indirect carbon emissions from the secondary treatment unit are 2.80×10 8 kgCO2 / a.

[0290] Step S23: The main processes of deep and regeneration treatment include coagulation, sedimentation, filtration, disinfection, activated carbon adsorption, membrane filtration, and ozone oxidation. Carbon emissions include indirect carbon emissions generated by purchased electricity, chemicals, and material consumption. The calculation formula is the same as step S132.

[0291] The power consumption of the equipment is 0.55kWh / m 3 The electricity emission factor is 0.5586 kgCO2 / kWh, and the carbon emissions are 3.06×10 7 kgCO2 / a;

[0292] The PAM consumption is 44.025t / a, the carbon emission factor is 1500kgCO2 / t, and the carbon emission is 6.6×10 4 kgCO2 / a;

[0293] The consumption of sodium hypochlorite is 7733.858t / a, the carbon emission factor is 1400kgCO2 / t, and the carbon emission is 1.08×10 7 kgCO2 / a;

[0294] The indirect carbon emissions of the deep processing unit are 3.21×10 8 kgCO2 / a.

[0295] Step S24: The carbon emission of the treated tail water is the direct carbon emission of methane and nitrous oxide (kgCO2 / a). In this embodiment, all the treated tail water is reused, so the carbon emission is 0.

[0296] Step S25: The carbon offset of the sewage and recycled water treatment process includes the carbon emissions of the recovered energy and resources in the production process, and the calculation formula is:

[0297]

[0298] In the formula, C ws-dx is the carbon offset in the sewage and recycled water treatment process (kgCO2 / a); AD ws-dx，iis the amount of energy or resource recovered from the i-th type (unit / a); EF i is the carbon emission factor of the ith energy or resource (kgCO2 / unit of measurement).

[0299] The amount of tail water reused is 300000m 3 / d, the carbon emission factor of tap water production is 0.168kgCO2 / m 3 , carbon offset of tail water reuse is 1.84×10 8 kgCO2 / a;

[0300] The photovoltaic power generation of the sewage treatment plant is 2205800kWh / a, the power emission factor is 0.5586kgCO2 / kWh, and the carbon emission is 1.23×10 7 kgCO2 / a;

[0301] The carbon offset is 1.96×10 8 kgCO2 / a.

[0302] Adding up the carbon emissions of each processing unit, the results are as follows:

[0303] Table 1

[0304]

[0305] Figure 5 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the electronic device may include: a processor 401, a communication interface 402, a memory 403 and a bus 404, wherein the processor 401, the communication interface 402, and the memory 403 communicate with each other through the bus 404. The communication interface 402 can be used for information transmission of the electronic device. The processor 401 can call the logic instructions in the memory 403 to execute the methods provided in each embodiment.

[0306] In addition, the logic instructions in the above-mentioned memory 403 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the above-mentioned method embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0307] On the other hand, an embodiment of the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the methods provided in the above embodiments.

[0308] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0309] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on this understanding, the above technical solution, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer,

[0310] Server, or network equipment, etc.) executes the methods described in various embodiments or certain parts of the embodiments.

[0311] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating carbon emissions during the operation of a drainage project, characterized in that: Step S1: Collect carbon emission data of each process of the drainage network to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions, so as to calculate the amount of carbon emissions; Step S2: Collect carbon emission data from each treatment unit of sewage and reclaimed water treatment to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions, so as to calculate the amount of carbon emissions; Step S3: Collect carbon emission data from the sludge treatment and disposal processes separately to identify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions.

2. The carbon emission accounting method for drainage engineering operation process according to claim 1 is characterized in that: In step S1: Step S11: The carbon emissions from the septic tanks in the drainage network are direct carbon emissions, and the types of greenhouse gases emitted specifically include fossil-derived carbon dioxide and methane; Step S12: The carbon emissions from the pipes in the drainage network are direct carbon emissions, and the types of greenhouse gases emitted specifically include fossil-derived carbon dioxide and methane; Step S13: When the overflow of the pipe network is discharged on rainy days, the carbon emissions generated by runoff pollution include direct emissions and indirect emissions. The activity data generating carbon emissions are counted and calculated respectively; Step S14: Carbon emissions generated during the regular cleaning of drainage pipes and sludge construction materials, including indirect carbon emissions caused by energy and resource consumption and carbon offsets caused by the utilization of pipe sludge as construction materials; Step S15: The carbon emissions caused by the operation of the drainage pump station include direct emissions from the pump station sump and indirect emissions from the operation of the pump station equipment.

3. The carbon emission accounting method for drainage engineering operation process according to claim 2 is characterized in that: In step S11: Step S111: The calculation formula for the emission of fossil-based carbon dioxide in the septic tank is: In the formula, C hfc-CO2 is the carbon dioxide emission from fossil sources in septic tanks (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); EF CO2 is the carbon dioxide emission factor, kgCO2 / kg COD; N is the population served by the septic tank; V is the amount of sewage discharged per person per day, m 3 / (person·d); COD hfc,in COD concentration of septic tank influent, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average temperature of septic tank sewage, ℃; t is the hydraulic retention time of the septic tank, d. Step S112: The methane emission from the septic tank can be calculated by collecting gas samples in a floating tank and then measuring the methane concentration in the samples; When actual measurement conditions are not available, calculations can be performed using theoretical formulas, including: Step S1121: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the septic tank is: In the formula, C hfc-CH4 is the methane carbon emission from the septic tank (kgCO2 / a); r is the methane production rate (kg CH4 / (m 3 ·d)); V qy is the volume of the floating tank used for gas sampling (m 3 );A fhc is the cross-sectional area of ​​the septic tank (m 2 );A qy is the cross-sectional area of ​​the floating tank (m 2 ); GWP CH4 is the global warming potential of methane; Step S1122: Calculate the methane emission in the septic tank using a theoretical formula: hfc-CH4 =EF CH4 ×q×COD hhfc,in ×N×365×GWP CH4 In the formula, C hfc-CH4 is the methane carbon emission from septic tank (kgCO2 / a); EF CH4 is the methane emission factor, kg CH4 / kgCOD; q is the sewage discharge equivalent, m 3 / (person·d); COD hfc，in COD concentration of septic tank influent, kg / m 3 ; GWP CH4 is the global warming potential of methane.

4. The carbon emission accounting method for drainage engineering operation process according to claim 2 is characterized in that: In step S12: Step S121: The calculation formula for the amount of carbon dioxide emitted from fossil fuels in the pipeline is: In the formula, C gq-CO2 is the carbon dioxide emission from fossil sources in pipelines (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); EF CO2 is the carbon dioxide emission factor, kgCO2 / kgCOD; N is the population served by the pipeline; V is the amount of sewage discharged per person per day, m 3 / (person·d); COD gq，in COD concentration of pipe inlet water, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average temperature of sewage in the canal, ℃; t is the residence time of sewage in the canal, d; Step S122: The methane emission in the pipeline can be calculated by collecting gas samples and then measuring the methane concentration in the samples; when the conditions for actual measurement are not available, it can be calculated according to a theoretical formula; wherein: Step S1221: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the pipeline is: C gq，CH4 =C g，CH4 ×16×Q gq ×365×GWP CH4 In the formula, C gq，CH4 is the carbon emission of methane in pipelines, kgCO2 / a; C g，CH4 is the methane concentration in the gas in the pipeline, mol / L; 16 is the molecular weight of methane; Q gq is the average daily flow rate of sewage in the canal, m 3 / d;GWP CH4 is the global warming potential of methane; Step S1222: The methane emission in the pipeline is calculated by the theoretical formula: C gq-CH4 =0.419×1.06 T-20 ×Q gq 0.26 ×D 0.28 ×S -0.138 ×L×365 In the formula, C gq-CH4 is the methane carbon emission in the canal (kgCO2 / a); T is the average temperature of sewage in the canal, °C; Q gq is the sewage flow in the pipe, m 3 / s; D is the pipeline diameter, m; S is the pipeline slope, m / m; L is the pipeline length, km.

5. The carbon emission accounting method for drainage engineering operation process according to claim 2 is characterized in that: In step S13: Step S131: Direct emissions from runoff pollution into water bodies include emissions of methane and nitrous oxide; wherein: Step S1311: The calculation formula for the methane emissions generated by runoff pollution discharged into the water body is: In the formula, C yl-CH4 It is the methane emission generated by runoff pollution after sewage or rainwater in the pipe network is discharged into natural water bodies, kgCO2e / a; COD yl，i is the organic matter concentration in sewage or rainwater when runoff pollution is discharged into natural water bodies for the i-th time, kg COD / m 3 ;Q yl，j is the amount of water discharged into natural water bodies for the first time, m 3 EF CH4 is the methane emission factor, kgCH4 / kgCOD; GWP CH4 is the global warming potential of methane; Step S1312: The calculation formula for nitrous oxide emissions is: In the formula, C yl-CH4 It is the methane emission generated by runoff pollution after sewage or rainwater in the pipe network is discharged into natural water bodies, kgCO2e / a; COD yl，i is the organic matter concentration in sewage or rainwater when runoff pollution is discharged into natural water bodies for the i-th time, kg COD / m 3 ;Q yl，i is the amount of water discharged into natural water bodies for the first time, m 3 EF CH4 is the methane emission factor, kgCH4 / kgCOD; GWP CH4 is the global warming potential of methane; Step S132: Indirect emissions caused by runoff pollution discharged into water bodies include carbon emissions caused by power consumption of equipment such as water pumps during overflow. The emission calculation formula is: In the formula, c vl-ii is the indirect carbon emission generated during overflow, (kgCO2 / a); AD yl-jj，i is the consumption of the i-th energy or resource during overflow (unit / a); EF i is the carbon emission factor of the ith energy or resource (kgCO2 / unit of measurement).

6. The carbon emission accounting method for drainage engineering operation process according to claim 2 is characterized in that: In step S14: Step S141: Indirect emissions generated during the regular cleaning of pipes and canals and the use of sludge as building materials, including carbon emissions generated by power consumption of equipment such as pumps and tap water consumption, calculated using the same formula as step 132; Step S142: The carbon offset amount brought by the utilization of pipe sludge as building materials is calculated as follows: In the formula, C at-dx is the carbon offset generated by the use of sewage sludge as building materials, (kgCO2 / a); AD qt-dx，i The amount of the i-th building material made from canal sludge, unit of measurement / a; EF i is the carbon emission factor of the i-th building material during production (kgCO2 / unit of measurement).

7. The method for calculating carbon emissions during the operation of a drainage project according to claim 2 is characterized in that: In step S15: Step S151: Direct carbon emissions from the operation of the pump station include fossil-source carbon dioxide and methane that escape from the water collection pool; wherein: Step S1511: The calculation formula for the amount of carbon dioxide emitted from fossil fuels in the water collection pool of the pump station is as follows: In the formula, C jsc-CO2 is the fossil-based carbon dioxide emission from the pump station water collection pool (kgCO2 / a); α is the proportion of fossil-based organic matter to all organic matter in sewage (%); EF CO2 is the carbon dioxide emission factor, kgCO2 / kgCOD; V min is the volume corresponding to the lowest design water level of the water collection tank, m 3 ;COD jsc COD concentration of rainwater or sewage in the collection tank, kg / m 3 ; η 20 is the anaerobic conversion rate of organic matter at 20℃; T is the average water temperature of the pump station collection tank, ℃; t is the average residence time of rainwater or sewage in the collection tank at the minimum design water level, d. Step S1512: The methane emission from the water collection tank of the pump station can be calculated by collecting gas samples in a floating tank and then measuring the methane concentration in the samples; when the conditions for actual measurement are not available, the calculation can be performed according to a theoretical formula, where: Step S15121: When the methane concentration is obtained through on-site measurement, the methane emission calculation formula of the pump station sump is as follows: In the formula, C jsc-CH4 is the methane carbon emission from the water collection pool, (kgCO2 / a); r is the methane production rate, (kgCH4 / (m 3 ·d)); V qy is the volume of the flux box used for sampling (m 3 );A jsc is the area of ​​the water collection tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP CH4 is the global warming potential of methane. Step S15122: When the methane concentration cannot be obtained through on-site measurement, the methane emission calculation formula of the pump station sump is as follows: C jsc-CH4 =EF CH4 ×COD jsc ×V min ×GWP CH4 ×365 In the formula, C jsc-CH4 is the methane carbon emission of the water collection pool, (kgCO2 / a); EF CH4 is the emission factor of methane, kg CH4 / kgCOD; COD jsc is the average COD concentration in the water collection pool, kg / (m 3 ·d); V mm is the volume corresponding to the lowest design water level of the water collection tank, m 3 ; GWP CH4 is the global warming potential of methane; Step S152: Indirect emissions generated by the operation of the pump station, including carbon emissions generated by electricity consumption of equipment such as pumps and tap water consumption, are calculated using the same formula as step S132.

8. The method for calculating carbon emissions during the operation of a drainage project according to claim 1 is characterized in that: In step S2: Step S21: The carbon emissions of the primary treatment unit include direct emissions from methane evaporation, indirect emissions from purchased electricity and chemicals, and consumption of tap water; Step S22: The secondary treatment unit mainly undergoes a biochemical treatment process, and carbon emissions include direct carbon emissions and indirect carbon emissions; Step S23: The main processes of deep and regeneration treatment include coagulation, sedimentation, filtration, disinfection, activated carbon adsorption, membrane filtration, and ozone oxidation. Carbon emissions include indirect carbon emissions generated by purchased electricity, chemicals, and material consumption. The calculation formula is the same as that of step S132; Step S24: The carbon emissions of the tailwater discharged after treatment are direct carbon emissions of methane and nitrous oxide (kgCO2 / a); Step S25: The carbon offset of the sewage and recycled water treatment process includes the carbon emissions of the recovered energy and resources in the production process, and the calculation formula is: In the formula, C ws-dx is the carbon offset in the sewage and recycled water treatment process, (kgCo2 / a); AD ws-dx，i is the amount of energy or resource recovered from the i-th type (unit / a); EF i is the carbon emission factor of the ith energy or resource (kgCO2 / unit of measurement).

9. The method for calculating carbon emissions during the operation of a drainage project according to claim 8 is characterized in that: In step S21: Step S211: Direct carbon emissions from methane escape during the primary treatment process should be calculated as follows: C cj-CH4 =f CH4 ×Q×(COD in -CODE out )×EF CH4 ×10 -3 ×365 In the formula, C cj-CH4 is the direct carbon emission from methane escape during the primary treatment process, kgCO2 / a; f CH4 is the ratio of methane released from the primary treatment process to methane emitted from the biochemical reaction process, %; Q is the average daily water inflow of the sewage treatment plant, m 3 / d;COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EF CH4 is the emission factor of methane, kgCH4 / kgCOD; Step S212: The indirect carbon emissions of the primary treatment unit include the carbon emissions generated by equipment power consumption, chemicals and tap water consumption, and the calculation formula is the same as step 132.

10. The carbon emission accounting method during the operation of a drainage project according to claim 8 is characterized in that: In step S22: Step S221: The direct carbon emissions of the secondary treatment unit include the emissions of fossil carbon dioxide, the carbon emissions during the mineralization process of the added carbon source, the emissions of methane, and the emissions of nitrous oxide; wherein: Step S2211: The emission of fossil-based carbon dioxide from the secondary processing unit is calculated using the formula: C sh-CO2 =α×Q in ×(COD in -CODE out )×EF CO2 ×10 -3 ×365 In the formula, C sh-CO2 is the carbon emission of the secondary treatment unit, (kgCO2 / a); α is the proportion of fossil organic matter to all organic matter in sewage (%); Q is the average daily inflow of the sewage plant, m 3 / d;COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EF CO2 CO2 emission factor from fossil sources in wastewater, kgCO2 / kgCOD; Step S2212: The carbon emissions generated by the secondary treatment unit and the carbon source mineralization process are calculated as follows: C ty-CO2 =M ty ×EF ty，CO2 ×365 In the formula, C ty-CO2 is the carbon emission generated by mineralization of external carbon source, kgCO2 / a; M ty Daily amount of carbon source added to the sewage treatment plant, kg / d; EF ty-CO2 is the carbon emission factor of the added carbon source, kgCO2 / kg; Step S2213: The carbon emissions of methane from the secondary treatment unit can be calculated by collecting gas samples on site and measuring the gas concentration using the closed flux box method, open flux box method or tail gas method according to the characteristics and operating status of the treatment unit; when the direct carbon emissions cannot be calculated using the actual measurement method, the emission factor method can be used, where: Step S22131: The methane emitted from the non-sealed reactor in a non-aerated state can be collected using a closed flux box method, and the emission amount is calculated using the following formula: In the formula, C bstlx-CH4 is the methane carbon emission calculated by the closed flux box method, (kgCO2 / a); r CH4 is the methane production rate, (kg CH4 / (m 3 ·d)); V qy is the volume of the closed flux box used for sampling, (m 3 );A fyc is the cross-sectional area of ​​the reaction tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP CH4 is the global warming potential of methane; Step S22132: The methane emitted from the non-closed reactor under aeration can be collected using the open flux box method, and the emission is calculated using the following formula: In the formula, C kstlx-CH4 is the methane carbon emission calculated by the open flux box method, (kgCO2 / a); Q g is the aeration volume, m 3 / h; C CH4 is the methane concentration in the gas, kg / m 3 ; A bqc is the cross-sectional area of ​​the aeration tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 );t bq is the daily aeration time, h; GWPC H4 is the global warming potential of methane; Step S22133: The methane in the full coverage reactor can be collected by tail gas method to calculate the carbon emissions. The calculation formula is: C wq-CH4 =Q wq ×C CH4 ×24×365×GWP CH4 In the formula, C wq-CH4 is the methane carbon emission calculated based on the tail gas method, (kgCO2 / a); Q wq is the exhaust gas flow rate, m 3 / h; C CH4 is the methane concentration in the gas, kg / m 3 ; GWP CH4 is the global warming potential of methane; Step S22134: The methane carbon emissions based on the emission factor method are calculated using the formula: In the formula, C yz-CH4 is the methane carbon emission calculated based on the factor method, (kgCO2 / a); CODi n is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; m is the sludge production, t / d; θ is the sludge moisture content, %; σ is the organic component content in the sludge, %; EF CH4 is the methane emission factor, kgCH4 / kgCOD; is the sludge methane correction factor; Q is the sewage treatment volume, m 3 / d;GWP CH4 is the global warming potential of methane; Step S2214: The carbon emissions of nitrous oxide from the secondary treatment unit can be calculated by collecting gas samples on site and measuring the gas concentration using the closed flux box method, open flux box method or tail gas method according to the characteristics and operating status of the treatment unit; when the actual measurement method cannot be used to calculate the direct carbon emissions, the emission factor method can be used, where: Step S22141: The nitrous oxide emitted from the non-sealed reactor in a non-aerated state can be collected using a closed flux box method, and the emission amount is calculated using the following formula: In the formula, C bstlx-N2O is the nitrous oxide carbon emission calculated by the closed flux box method, (kgCO2 / a); r N2O is the rate of nitrous oxide production, (kg N2O / (m 3 ·d)); V qy is the volume of the closed flux box used for sampling, (m 3 );A fyc is the cross-sectional area of ​​the reaction tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 ); GWP N2O is the global warming potential of nitrous oxide; Step S22142: The nitrous oxide emitted from the non-closed reactor under aeration can be collected using the open flux box method to calculate the carbon emissions. The calculation formula is: In the formula, C kstlx-N2O is the nitrous oxide carbon emission calculated by the open flux box method, (kgCO2 / a); C N2O is the concentration of nitrous oxide in the gas, kg / m 3 ; A bqc is the cross-sectional area of ​​the aeration tank, (m 2 );A qy is the cross-sectional area of ​​the flux box, (m 2 );t bq is the daily aeration time, h; GWP N2O is the global warming potential of nitrous oxide; Step S22143: The nitrous oxide in the full coverage reactor can be collected by tail gas method to calculate the carbon emission. The calculation formula is: C wq-N2O =Q wq ×C N2O ×24×365×GWP N2O In the formula, C wq-N2O is the nitrous oxide carbon emission calculated based on the tail gas method, (kgCO2 / a); Q wq is the exhaust gas flow rate, m 3 / h; C N2O is the concentration of nitrous oxide in the gas, kg / m 3 ; GWP N2O is the global warming potential of nitrous oxide; Step S22144: The calculation formula for nitrous oxide carbon emissions based on the emission factor method is: C yz-N2O =(TN in -TN out )×EF N2O ×Q×365×GWP N2O In the formula, C yz-N2O is the nitrous oxide carbon emission calculated based on the factor method, (kgCO2 / a); TN in is the total nitrogen concentration in the inlet water, kgTN / m 3 TN out is the total nitrogen concentration in the effluent, kgTN / m 3 EF N2O is the nitrous oxide emission factor, kg N2O / kg TN; Q is the sewage treatment volume, m 3 / d;GWP N2O is the global warming potential of nitrous oxide; Step S222: The indirect carbon emissions of the secondary treatment unit include the carbon emissions generated by equipment power consumption, chemicals and tap water consumption, and the calculation formula is the same as step S132.

11. The carbon emission accounting method for drainage engineering operation process according to claim 8 is characterized in that: In step S24: Step S241: The tail water discharged after treatment, the methane carbon emission, is calculated by the formula: C st-CH4 =(CODE in -CODE out )×EF CH4 ×Q×365×GWP CH4 In the formula, C st-CH4 is the methane carbon emission of the tailwater after treatment (kgCO2 / a); COD in is the influent COD concentration, mg / L; COD out is the effluent COD concentration, mg / L; EF CH4 is the methane emission factor, kg CH4 / kgCOD; Q is the tail water discharge, m 3 / d;GWP CH4 is the global warming potential of methane. Step S242: The calculation formula for the nitrous oxide carbon emission in the tail water after treatment is: C yz-N2O =(TN in -TN out )×EF N2O ×Q×365×GWP N2O In the formula, C yz-N2O is the nitrous oxide carbon emission of the tail water after treatment (kgCO2 / a); TN in is the influent COD concentration, mg / L; TN out is the effluent COD concentration, mg / L; EF N2O is the nitrous oxide emission factor, kg N2O / kgTN; Q is the tailwater discharge, m 3 / d;GWP N2O is the global warming potential of methane.

12. The carbon emission accounting method for drainage engineering operation process according to claim 1 is characterized in that: In step S3: Step S31: The sludge treatment process includes concentration and dehydration, transportation and storage, anaerobic digestion, aerobic composting, incineration and deodorization, and the carbon emission data are collected separately to clarify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions; Step S32: The sludge disposal process includes building material utilization, land utilization, and sanitary landfill, and the carbon emission data are collected separately to clarify the types of carbon emission sources, types of greenhouse gases, and the amount of activities that produce carbon emissions in order to calculate the amount of carbon emissions; Step S33: The carbon offset of the sludge treatment and disposal process includes the carbon emissions of the recovered energy and resources in the production process, and the calculation formula is the same as step S25.

13. The carbon emission accounting method for drainage engineering operation process according to claim 12 is characterized in that: In step S31: Step S311: The carbon emissions generated by sludge concentration and dehydration are indirect carbon emissions generated by purchased electricity and chemicals, and the calculation formula is the same as step 132; Step S312: Calculation of carbon emissions from sludge transportation and storage includes direct carbon emissions from methane released by biochemical reactions during transportation and storage and indirect carbon emissions from purchased electricity and materials, where: Step S3121: Direct carbon emissions from sludge transportation and storage are calculated as follows: C sszc-zj =AD cc ×EF sszc,CH4 ×365×GWP CH4 In the formula, C sszc-zj is the direct carbon emission from sludge transportation and storage process (kgCO2 / a); AD cc is the sludge transportation and storage volume (tDS / d); EF sszc，CH4 Methane emission factor for sludge transportation and storage (kgCO2 / tDS); GWP CH4 is the global warming potential of methane; Step S3122: Indirect carbon emissions during sludge transportation and storage, calculated using the same formula as step S132; Step S313: The carbon emissions from the anaerobic digestion process of sludge include direct carbon emissions from methane released during the biochemical process and indirect carbon emissions from purchased electricity and chemicals, where: Step S3131: Direct carbon emissions from anaerobic sludge digestion are calculated as follows: C yyxh-zj =AD yyxh ×EF yyxh-CH4 ×365×GWP CH4 In the formula, C yyxh-zj is the direct carbon emission from anaerobic digestion of sludge (kgCO2 / a); AD yyxh is the amount of sludge treated by anaerobic digestion (tDS / d); EF yyxh-CH4 is the methane carbon emission factor for anaerobic digestion (kgCH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3132: indirect carbon emissions during anaerobic digestion of sludge, calculated using the same formula as step S132; Step S314: The carbon emissions from the aerobic fermentation process of sludge include direct carbon emissions from methane and nitrous oxide released in the biochemical process, and indirect carbon emissions from purchased electricity and chemicals, where: Step S3141: The carbon emission of methane generated during the aerobic fermentation of sludge is calculated as follows: C hyfj-CH4 =AD hyfj ×EF fyfj-CH4 ×365×GWP CH4 In the formula, C hyfj-CH4 is the carbon emission of methane during aerobic fermentation of sludge (kgCO2 / a); AD hyfj is the amount of sludge treated by aerobic fermentation (tDS / d); EF hyfj-CH4 is the methane carbon emission factor for aerobic fermentation (kgCH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3142: The carbon emission of nitrous oxide generated during the aerobic fermentation of sludge is calculated as follows: C hyfj-N2O =AD hyfj ×EF fyfj-N2O ×365×GWP N2O In the formula, C hyfj-N2O is the carbon emission of nitrous oxide during aerobic fermentation of sludge (kgCO2 / a); AD hyfj is the amount of sludge treated by aerobic fermentation (tDS / d); EF hyfj-CH4 is the nitrous oxide carbon emission factor of the aerobic fermentation process (kgCH4 / tDS); GWP N2O is the global warming potential of nitrous oxide; Step S3143: indirect carbon emissions during the sludge aerobic fermentation process, calculated using the same formula as step S132; Step S315: The calculation of carbon emissions from sludge incineration should include direct carbon emissions from fossil sources of carbon dioxide, methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including: Step S3151: The calculation formula for fossil-based carbon dioxide emissions during sludge incineration is: C fs-CO2 =β×AD fs ×EF fs-CO2 ×365 In the formula, C fs-CO2 is the carbon emission of fossil carbon dioxide generated by sludge incineration (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge (%); AD FS is the amount of sludge incinerated (tDS / d); EF fs-CO2 is the carbon dioxide emission factor from fossil sources (kgCO2 / tDS); Step S3152: The methane emission during sludge incineration is calculated as follows: C fs-CH4 =AD fs ×EF fs-CH4 ×365×GWP CH4 In the formula, C fs-CH4 is the carbon emission of methane produced by sludge incineration, (kgCO2 / a); AD FS is the amount of sludge incinerated (tDS / d); EF fs-CH4 is the methane emission factor of the incineration process (kg CH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3153: The nitrous oxide emissions during the sludge incineration process are calculated using the formula: C fs-N2O =AD fs ×EF fs-N2O ×365×GWP N2O In the formula, C fs-N2O is the carbon emission of nitrous oxide produced by sludge incineration, (kgCO2 / a); AD FS is the amount of sludge incinerated (tDS / d); EF Fs-N2O is the emission factor of nitrous oxide in the incineration process (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide; Step S3154: indirect carbon emissions during sludge incineration, calculated using the same formula as step S132; Step S316: The calculation of carbon emissions generated by deodorization during the sludge treatment process should include direct carbon emissions of methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, among which: Step S3161: The methane carbon emissions generated by the deodorization process of the sludge treatment are calculated as follows: C cc-CH4 =AD cc ×EF cc-CH4 ×365×GWP CH4 In the formula, C cc-CH4 Carbon emissions of methane produced by sludge deodorization process, (kgCO2 / a); AD cc is the sludge treatment capacity (tDS / d); EF cc-CH4 is the emission factor of deodorized methane in the sludge treatment process (kg CH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3162: The nitrous oxide carbon emissions generated by the deodorization process of the sludge treatment are calculated as follows: C cc-N2O =AD cc ×EF cc-N2O ×365×GWP N2O In the formula, C cc-N2O Carbon emissions of nitrous oxide produced by sludge deodorization process, (kgCO2 / a); AD cc is the sludge treatment capacity (tDS / d); EF cc-N2O Emission factor of nitrous oxide for sludge treatment process deozonation (kg CH4 / tDS); GWP N2O is the global warming potential of nitrous oxide; Step S3163: The indirect carbon emissions from deodorization during the sludge treatment process are calculated using the same formula as step S132.

14. The method for calculating carbon emissions during the operation of a drainage project according to claim 12, characterized in that: In step S32: Step S321: The carbon emissions from the use of sludge as building materials shall include direct carbon emissions from fossil-based carbon dioxide, methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including: Step S3211: The calculation formula for the carbon dioxide emissions from fossil sources of sludge building materials is: C jc-CO2 =β×AD jc ×EF jc-CO2 ×365 In the formula, C jc-CO2 is the carbon emission of fossil carbon dioxide generated by the use of sludge as building materials (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge (%); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-CO2 is the carbon dioxide emission factor from fossil sources (kgCO2 / tDS); Step S3212: The methane emissions from the use of sludge as building materials are calculated using the formula: C jc-CH4 =AD jc ×EF jc-CH4 ×365×GWP CH4 In the formula, C jc-CH4 is the carbon emission of methane generated by the use of sludge as building materials, (kgCO2 / a); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-CH4 Emission factor for methane used in building materials (kgCH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3213: The calculation formula for nitrous oxide emissions from the use of sludge building materials is: C jc-N2O =AD jc ×EF jc-N2O ×365×GWP N2O In the formula, C jc-N2O is the carbon emission of nitrous oxide generated by the use of sludge as building materials, (kg CO2e / a); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-N2O Emission factor for nitrous oxide used in building materials (kg N2O / tDS); AD jc The amount of sludge disposed for building materials utilization (tDS / d); EF jc-N2O Emission factor for nitrous oxide used in building materials (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide; Step S3214: Indirect carbon emissions from the use of sludge as building materials, calculated using the same formula as step S132; Step S322: Carbon emissions from sludge land use should include direct carbon emissions of methane and nitrous oxide, and indirect carbon emissions from purchased electricity and materials, including: Step S3221: The calculation formula for methane emissions from sludge land use is: C td-CH4 =AD td ×EF td-CH4 ×365×GWP CH4 In the formula, C td-CH4 is the carbon emission of methane generated by land use of sludge, (kgCO2 / a); AD td is the amount of sludge disposed of on land (tDS / d); EF td-CH4 is the emission factor of methane from land use (kg CH4 / tDS); GWP CH4 is the global warming potential of methane; Step S3222: The calculation formula for nitrous oxide emissions from sludge land use is: C td-N2O =AD td ×EF td-N2O ×365×GWP N2O In the formula, C td-N2O is the carbon emission of nitrous oxide generated by land use of sewage sludge, (kg CO2e / a); AD td is the amount of sludge disposed of on land (tDS / d); EF td-N2O is the emission factor of nitrous oxide from land use (kg N2O / tDS); AD td is the amount of sludge disposed of on land (tDS / d); EF td-N2O is the emission factor of nitrous oxide from land use (kg N2O / tDS); GWP N2O is the global warming potential of nitrous oxide; Step S3223: Indirect carbon emissions from sludge land use, calculated using the same formula as step S132; Step S323: The carbon emissions from sludge sanitary landfill should include direct carbon emissions from fossil carbon dioxide and methane, and indirect carbon emissions from purchased electricity and materials, including: Step S3231: The calculation formula for fossil-based carbon dioxide emissions generated by sludge sanitary landfill is: C tm-CO2 =β×AD ta ×EF tm-CO2 ×365 In the formula, C tm-CO2 is the carbon dioxide emission from sludge sanitary landfill, (kgCO2 / a); β is the proportion of fossil organic matter to all organic matter in sludge, (%); AD tm The amount of sludge in sanitary landfill (tDS / d); EF td-CO2 is the CO2 emission factor for sanitary landfill (kg CH4 / tDS); Step S3232: The methane emission from sludge sanitary landfill is calculated as follows: In the formula, C tm-CH4 is the carbon emission of methane produced by sludge sanitary landfill, (kg CO2e / a); AD tm is the amount of sludge disposed of in sanitary landfills, (tDS / d); DOC is the proportion of degradable organic carbon, 0.5kgC / kgDS; DOC f is the proportion of degradable organic carbon after decomposition, (%); MCF is the methane correction factor; F is the proportion of methane in landfill gas, (%); R is the proportion of methane recovered from landfill gas, (%); OX is the oxidation factor; GWP CH4 is the global warming potential of methane; Step S3233: Indirect carbon emissions from sludge sanitary landfill, calculated using the same formula as step S132.

15. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method for calculating carbon emissions during the operation of a drainage project as described in any one of claims 1 to 14 are implemented.

16. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for calculating carbon emissions during the operation of a drainage project as described in any one of claims 1 to 14 are implemented.

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