Device, method, equipment and medium for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities

Abstract

The present invention discloses a device, method, equipment and medium for calculating the carbon emissions of rural sewage treatment facilities throughout their life cycle. The present invention provides a method for calculating the carbon emissions of rural sewage treatment facilities throughout their life cycle, which integrates the "emission factor method" and the "mass balance method" to achieve a quantitative evaluation of carbon emissions in each stage of construction, operation and demolition of rural sewage treatment facilities. The method also calculates the total carbon emissions of rural sewage treatment facilities throughout their life cycle based on the carbon emissions in each stage of facility construction, operation and demolition, and then calculates the total carbon emissions of the facilities throughout their life cycle and the total carbon emissions of the assessment area to calculate the carbon emissions of rural sewage treatment facilities, thereby achieving simultaneous analysis, comparison and quantitative evaluation of carbon emissions in multiple stages, multiple dimensions and multiple levels, from different stages and different areas of the entire life cycle of a single sewage treatment facility to the target assessment area.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon emission assessment, and in particular to a device, method, equipment and medium for calculating the full life cycle of carbon emissions from rural sewage treatment facilities. Background Art

[0002] In recent years, with the ongoing efforts to improve rural living environments, a large number of rural sewage treatment facilities have been constructed and put into operation. While rural sewage treatment aims to reduce environmental pollution, the construction, operation, and removal of these facilities generate significant carbon emissions.

[0003] Most existing carbon emission accounting methods related to wastewater treatment primarily focus on carbon emissions from urban wastewater treatment systems, with insufficient attention paid to carbon emissions from rural wastewater treatment. These methods primarily focus on carbon emissions from wastewater treatment systems, lack a holistic view of the entire wastewater treatment process, and insufficiently consider carbon emissions from wastewater collection and transportation systems, such as pipeline networks. They primarily focus on carbon emissions during the wastewater treatment operation phase, with insufficient consideration of carbon emissions from the entire lifecycle of wastewater treatment facility construction, operation, and demolition. They primarily consider carbon emissions from individual wastewater treatment facilities, with insufficient consideration of the energy efficiency ratios and carbon emission factors of wastewater treatment technologies. Furthermore, they primarily consider carbon emissions from wastewater treatment facilities, with insufficient consideration of the coordinated development of low-carbon wastewater treatment-related construction and operations across multiple levels within a region. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the existing technology. The technical problem to be solved by the present invention is to quantify the carbon emissions and energy consumption involved in the construction, operation and demolition of rural sewage treatment facilities, thereby providing a method and device for calculating the carbon emissions of rural sewage treatment facilities throughout their life cycle.

[0005] In a first aspect, the present invention provides a device for calculating the carbon emissions of rural sewage treatment facilities throughout their life cycle. The device includes a data acquisition module for collecting carbon emission indicators during the construction, operation, and demolition phases of facilities within a target study area. The module includes a facility construction phase data acquisition submodule, a facility operation phase data acquisition submodule, and a facility demolition phase data acquisition submodule.

[0006] A calculation module, connected to the data acquisition module, for calculating the total carbon emissions of rural sewage treatment facilities over their entire life cycle using a carbon emissions life cycle accounting method based on data provided by the acquisition module;

[0007] A statistical analysis module, connected to the calculation module, is used to obtain, based on the calculation results of the calculation module, the following through statistical analysis methods: the total carbon emissions from sewage treatment in the target assessment area, the total carbon emissions during the construction, operation, and demolition stages of the sewage treatment facility's entire life cycle, a comparison of carbon emissions in each sub-area, the relationship between the scale of different sewage treatment sites and carbon emissions, and analysis, comparison, and accounting of carbon emissions from different sewage treatment processes;

[0008] It also includes a result output module, which is connected to the statistical analysis module and is used to output the statistical analysis results.

[0009] Preferably, the facility construction phase data collection submodule is used to collect: the construction phase purchased electricity consumption data, power fuel consumption data, construction material consumption data, water inlet and outlet water volume and water quality data during the trial operation, methanol, PAC, and lime chemical consumption data; the facility operation phase data collection submodule and the facility demolition phase data collection submodule are both used to collect: the operation phase purchased electricity consumption data, power fuel consumption data, water inlet and outlet water volume and water quality data, methanol, PAC, and lime chemical consumption data, and vegetation type, area, and population size data within the site.

[0010] Preferably, the calculation module includes: a facility construction phase calculation submodule, a facility operation phase calculation submodule, a facility demolition phase calculation submodule and a facility full life cycle carbon emission total amount calculation submodule; the facility construction phase calculation submodule is used to perform calculations based on the collected construction phase data, and summarize the carbon emissions of the facility construction phase; the facility operation phase calculation submodule is used to perform calculations based on the collected operation phase data, and summarize the carbon emissions of the operation phase; the facility demolition phase calculation submodule is used to perform calculations based on the collected demolition phase data, and summarize the carbon emissions of the facility demolition phase; the facility full life cycle carbon emission total amount calculation submodule is used to perform calculations based on the facility construction phase carbon emissions, the facility operation phase carbon emissions, and the facility demolition phase carbon emissions, and thus obtain the rural sewage treatment facility full life cycle carbon emissions.

[0011] Preferably, the calculation module is also used to calculate the carbon emissions of rural sewage treatment facilities based on the total carbon emissions of the sewage treatment facilities over their entire life cycle and the total carbon emissions of the assessment area.

[0012] A second aspect of the present invention provides a method for calculating the carbon emissions of a rural sewage treatment facility throughout its life cycle, characterized in that the method is performed using any of the above-mentioned devices for calculating the carbon emissions of a rural sewage treatment facility throughout its life cycle, and specifically includes:

[0013] Collect data from the construction, operation, and demolition stages of rural sewage treatment facilities, and determine the carbon emissions during the construction, operation, and demolition stages of the facilities based on the collected data;

[0014] Carbon emissions from rural sewage treatment facilities are divided into two types: direct emissions and indirect emissions. Direct emissions are greenhouse gas emissions directly generated by sewage treatment facilities, mainly including CH4 and N2O greenhouse gas emissions generated during sewage collection, transportation and biochemical treatment. Indirect emissions are CO2 greenhouse gas emissions corresponding to energy and resource consumption during the construction, operation and demolition of sewage treatment facilities, mainly including greenhouse gas emissions corresponding to the consumption of purchased electricity, power fuels, construction materials and chemical agents, expressed as kilograms of carbon dioxide equivalent per cubic meter (kg CO2eq / m 3 ), where the calculation formula for carbon emissions during the facility construction phase is as follows:

[0015]

[0016] In the above formula, C c represents the carbon emissions during the facility construction phase (kg CO2eq), C CD_i represents the direct carbon emissions during the construction phase of the i-th facility, C CE_i represents the indirect carbon emissions during the construction phase of the i-th facility.

[0017] Preferably, the calculation formula for direct carbon emissions during the trial operation of the facility construction phase is as follows:

[0018]

[0019] In the above formula, C CD represents the direct carbon emissions during the facility construction phase (kg CO2eq), E C，CH4_i represents the direct carbon emission of CH4 emitted from the collection and transportation system of the pipeline network on day i (kg CO2eq), E S，CH4_i represents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2eq), E S，N2O_i represents the direct carbon emission of N2O discharged from the sewage treatment system on day i (kg CO2eq);

[0020] The CH4 carbon emissions from the sewage collection and transportation system are calculated as follows:

[0021] E C，CH4_i =C CH4_i ×GWP CH4

[0022] In the above formula, E C，CH4_irepresents the direct carbon emissions of CH4 from the sewage collection and transportation system on day i (kg CO2eq), GWP CH4 represents the global warming potential of CH4, which is 28;

[0023] The direct CH4 emissions from the sewage collection and transportation system are calculated as follows:

[0024] C CH4_i =[Q i ×(COD in_i -COD out_i )÷1000-S i ]×B0×MCF i

[0025] In the above formula, C CH4_i represents the direct CH4 emission from the sewage collection and transportation system on day i (kgCH4), Q i represents the amount of water collected and transported by the sewage collection and transport system on day i (m 3 ), COD in_i represents the average influent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), COD out_i represents the average effluent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed by ditch sludge treatment on day i (kgCOD Cr ), B O Indicates the maximum methane production capacity of organic matter, with a value of 0.25 (kgCH4 / kgCOD Cr ), MCFi represents the methane correction factor.

[0026] Preferably, the direct N2O emissions from the sewage treatment system are calculated as follows:

[0027] S N2O_i =[Q i ×(TN in_i -TN out_i )÷1000]×EF N2O ×C N2O / N2

[0028] In the above formula, S N2O_i represents the direct N2O emission from the sewage treatment system on day i (kgN2O), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), TN in_i represents the average influent TN concentration of the sewage treatment system on day i (mg / L), TN out_irepresents the average TN concentration of the sewage treatment system at day i (mg / L), EF N2O represents the N2O emission factor, which is 0.016 (kgN2O-N / kgTN), C N2O / N2 It represents the mass conversion coefficient of N2O / N2, and its value is 44 / 28.

[0029] Preferably, the calculation formula for indirect carbon emissions during the facility construction phase is as follows:

[0030]

[0031] In the above formula, C 0E Indicates the indirect carbon emissions during the facility operation phase (kg CO2eq), E i represents the consumption of the i-th type of purchased electricity (kWh), EF E_i represents the carbon emission factor of the i-th resource (kgCO2eq / kWh); F j represents the consumption of the jth fuel (kg), EF F_j represents the carbon emission factor of the jth fuel (kgCO2eq / kg); CH k Indicates the consumption of the kth chemical agent (kg), EF CH_k represents the carbon emission factor of the kth chemical (kgCO2eq / kg); B l Indicates the consumption of the first type of construction material (kg), EF B_l Indicates the carbon emission factor of the first type of construction material (kgCO2eq / kg).

[0032] The third aspect of the present invention provides a computer device, which includes a processor and a memory, the memory is used to store a computer program, the computer program includes a program, and the processor is configured to call the computer program to execute the steps of the full life cycle accounting method for carbon emissions of rural sewage treatment facilities as described in any one of the above.

[0033] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, which is executed by a processor to implement any one of the above-mentioned methods for calculating the full life cycle of carbon emissions from rural sewage treatment facilities.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities, which integrates the "emission factor method" and the "mass balance method" to achieve quantitative evaluation of carbon emissions in each stage of construction, operation, and demolition of rural sewage treatment facilities. Based on the carbon emissions in each stage of facility construction, operation, and demolition, the total carbon emissions of rural sewage treatment facilities throughout their life cycle are calculated, and then the total carbon emissions of the facilities throughout their life cycle and the total carbon emissions of the assessment area are calculated to calculate the carbon emissions of rural sewage treatment facilities. It realizes simultaneous analysis, comparison, and quantitative evaluation of carbon emissions at multiple stages, multiple dimensions, and multiple levels, from different stages of the life cycle of a single sewage treatment facility, the collection and transportation system and biochemical treatment system of the treatment facility, different sewage treatment processes, and different scales, to different areas composed of multiple treatment facilities, and then to the target assessment area, thereby realizing the accounting of carbon emissions of rural sewage treatment facilities.

[0036] This invention uses full-lifecycle carbon emissions management to analyze and accurately calculate the energy efficiency ratio and carbon emission factors of sewage treatment technologies. This helps select low-carbon treatment processes and operating modes during subsequent maintenance and construction upgrades, and provides an effective reference for regional carbon emission reduction. Furthermore, based on a full-lifecycle carbon emissions accounting method for rural sewage treatment facilities, a comprehensive carbon emissions assessment system for rural sewage treatment facilities is established, providing data support for carbon emissions supervision by relevant departments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of a method for calculating carbon emissions throughout the life cycle of a rural sewage treatment facility in Example 1 of the present invention.

[0038] Figure 2 It is a schematic diagram of the carbon emission accounting model for the entire life cycle of rural sewage treatment facilities in Example 1 of the present invention.

[0039] Figure 3 This is a principle block diagram of a carbon emission quantitative evaluation device for urban sewage treatment facilities in Example 2 of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] Example 1

[0042] This embodiment provides a method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities. Figure 1 As shown, including:

[0043] Collect data from the construction, operation and demolition stages of rural sewage treatment facilities, and determine the carbon emissions during the facility construction, operation and demolition stages based on the collected data.

[0044] Furthermore, the scope of the target study area is determined, and the study area is divided into several sub-areas according to needs. The sub-areas contain several treatment facilities, and the treatment facilities include sewage treatment structures, equipment, devices, supporting pipelines, pumping stations and auxiliary facilities.

[0045] Among them, the target study area is the target rural area to be evaluated or calculated; the sub-area is the sub-area divided into which the target study area is divided according to administrative divisions or topography and village size characteristics; the sewage treatment facility is the system facility for collecting, transporting and treating sewage in each sub-area, and the sub-area may include several sets of sewage treatment facilities.

[0046] By analyzing and calculating the carbon emissions of each sewage treatment facility and each sub-area separately, and summarizing the results step by step, we can finally obtain the carbon emission values ​​at three levels: sewage treatment facilities, sub-areas, and target research areas.

[0047] Furthermore, basic data of the target study area, sub-areas and sewage treatment facilities are collected, among which the basic data of the target study area include the area of ​​the target study area, the number of sewage treatment sites and the length of the pipeline network, as well as regional planning data; the basic data of the sub-areas include the number of sub-areas, the area of ​​each sub-area, the number of sewage treatment facilities in each sub-area and related data; the basic data of the sewage treatment facilities include the original data such as the water quality, quantity, length and other inlet and outlet water quality of the pipeline network and the original data such as the water quantity and quality of the inlet and outlet water of the sewage treatment site / pump station, treatment scale and technology, electricity consumption information, occupied area, vegetation cover, etc.

[0048] Specifically, carbon emissions from rural sewage treatment facilities are divided into two types: direct and indirect. Direct emissions are greenhouse gas emissions directly generated by sewage treatment facilities, primarily including CH4 and N2O greenhouse gas emissions from sewage collection, transportation, and biochemical treatment. Indirect emissions are CO2 greenhouse gas emissions resulting from energy and resource consumption during the construction, operation, and dismantling of sewage treatment facilities. These emissions primarily include greenhouse gas emissions from the consumption of purchased electricity, power fuels, construction materials, and chemicals, and can be expressed in kilograms of carbon dioxide equivalent per cubic meter (kg CO2 eq / m3).

[0049] Furthermore, direct greenhouse gas emissions from the sewage collection and transportation process, namely fugitive carbon emissions from the sewage collection and transportation system, are estimated indirectly based on the degradation rate of organic matter in the pipeline network. The specific estimation steps are as follows: First, select a set of facilities and monitor the COD (chemical oxygen demand) concentration values ​​of the household wells and regulating tanks in the sewage collection and transportation system, i.e., the pipeline network. Three parallel inspection values ​​can be collected as needed. Finally, calculate the difference in COD concentration values ​​between the household wells and the regulating tanks (taking the sample average) to calculate greenhouse gas emissions, namely fugitive carbon emissions from the sewage collection and transportation system.

[0050] Preferably, for villages that transport sewage to the municipal pipe network, the COD concentration values ​​of the household wells and the lift pump station before entering the municipal pipe network are monitored, and the difference in COD concentration values ​​between the two is calculated (taking the sample average value).

[0051] Preferably, the difference in the above COD concentration values ​​divided by the length of the pipeline network is the COD degradation rate per kilometer of the pipeline network of the facility, which can be used as reference data for facilities without data.

[0052] Furthermore, the direct greenhouse gas emissions from the sewage treatment process, i.e., the fugitive carbon emissions from the sewage treatment system, are mainly calculated based on the difference in the inlet and outlet water volume, the inlet and outlet COD, and TN (Total Nitrogen) concentration values ​​of the sewage treatment system to calculate the COD and TN removal rates of the facility's sewage treatment system, and then the greenhouse gas emissions, i.e., the fugitive carbon emissions from the sewage treatment system, are calculated.

[0053] Furthermore, indirect emissions are the energy and resource consumption of purchased electricity, power fuel, construction materials, chemicals, etc. during the construction, operation, and demolition of sewage treatment facilities. They can be obtained through project settlement lists and daily operation and maintenance records, and greenhouse gas emissions can be calculated.

[0054] Furthermore, the original data of facilities can be divided into facility construction data, facility operation data, facility demolition data, etc. according to the entire life cycle.

[0055] Specifically, the facility construction phase is from the start of the project to the completion and acceptance of the project. The facility construction data mainly include the purchased electricity consumed during the use and trial operation of electric machinery and machinery, gasoline, diesel and other fuels consumed during the use of mechanical equipment such as excavators and transport vehicles, construction materials such as concrete, steel bars, sand and gravel, equipment pipe components and parts used in the construction process, design scale, inlet and outlet water characteristics, pipeline length, aperture and other related data, facility operation-related data such as inlet and outlet water volume and quality during the trial operation, consumption data of chemical agents such as methanol, PAC, lime, vegetation type and area within the site area, population size and other social and natural development indicators, etc., which can be obtained through design drawings and engineering construction data, and then the carbon emissions during the construction phase are calculated. The unit energy consumption in the manufacturing process of construction materials, the density of construction materials and the carbon content in the materials can be obtained by consulting literature.

[0056] The calculation formula for carbon emissions during the facility construction phase is as follows:

[0057]

[0058] In the above formula, C c represents the carbon emissions during the facility construction phase (kg CO2eq), C CD_i represents the direct carbon emissions during the construction phase of the i-th facility, C CE_i represents the indirect carbon emissions during the construction phase of the i-th facility.

[0059] Furthermore, the calculation formula for direct carbon emissions during the trial operation of the facility construction phase is as follows:

[0060]

[0061] In the above formula, C CD represents the direct carbon emissions during the facility construction phase (kg CO2eq), E C，CH4_i represents the direct carbon emission of CH4 emitted from the collection and transportation system of the pipeline network on day i (kg CO2eq), E S，CH4_i represents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2eq), E S，N2O_i represents the direct carbon emission of N2O discharged from the sewage treatment system on day i (kg CO2eq).

[0062] The CH4 carbon emissions from the sewage collection and transportation system are calculated using the following formula.

[0063] E C，CH4_i =C CH4_i ×GWP CH4

[0064] In the above formula, E C，CH4_irepresents the direct carbon emissions of CH4 from the sewage collection and transportation system on day i (kg CO2eq), GWP CH4 It represents the global warming potential of CH4, which is 28.

[0065] Furthermore, the direct CH4 emissions from the sewage collection and transportation system can be calculated using the following formula.

[0066] C CH4_i =[Q i ×(COD in_i -COD out_i )÷1000-S i ]×B0×MCF i

[0067] In the above formula, C CH4_i represents the direct CH4 emission from the sewage collection and transportation system on day i (kgCH4), Q i represents the amount of water collected and transported by the sewage collection and transport system on day i (m 3 ), COD in_i represents the average influent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), COD out_i represents the average effluent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed by ditch sludge treatment on day i (kgCOD Cr ), B O Indicates the maximum methane production capacity of organic matter, with a value of 0.25 (kgCH4 / kgCOD Cr ), MCF i represents the methane correction factor.

[0068] Preferably, if conditions are limited, 1kg COD is equivalent to 1000 / 64=15.625mol methane under standard conditions, which is converted to a weight of about 250g and a volume of 15.625*22.4=350L under standard conditions.

[0069] The CH4 emissions from the sewage treatment system can be calculated using the following formula.

[0070] E S，CH4_i =S CH4_i ×GWP CH4

[0071] In the above formula, E S，CH4_i represents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2eq), GWP CH4 It represents the global warming potential of CH4, which is 28.

[0072] Furthermore, the direct CH4 emissions from the sewage treatment system can be calculated using the following formula.

[0073] S CH4_i =[Q i ×(COD in_i -COD out_i )÷1000-s i ]×B0×MCF i

[0074] In the above formula, C CH4_i represents the direct CH4 emission from the sewage treatment system on day i (kgCH4), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), COD in_i represents the average influent COD of the sewage treatment system on day i Cr Concentration (mg / L), COD out_i represents the average effluent COD of the sewage treatment system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed in the form of sludge treatment on day i (kgCOD Cr ), Bo represents the maximum methane production capacity of organic matter, which is 0.25 (kgCH4 / kgCOD Cr ), MCFi represents the methane correction factor. The default value for aerobic treatment processes such as AO is 0.01, the default value for treatment processes based on anaerobic treatment processes or constructed wetlands is 0.1, and the default value for combined aerobic and anaerobic processes is 0.05.

[0075] The direct carbon emissions of N2O from sewage treatment systems can be calculated using the following formula.

[0076] E N2O_i =S N2O_i ×GWP N2O

[0077] In the above formula, E N2O_i represents the direct carbon emission of N2O from the sewage treatment system on day i (kg CO2eq), GWP N2O It represents the global warming potential of N2O, and its value is 265.

[0078] Furthermore, the direct N2O emissions from the sewage treatment system can be calculated using the following formula.

[0079] S N2O_i =[Q i ×(TN in_i -TN out_i )÷1000]×EF N2O ×C N2O / N2

[0080] In the above formula, S N2O_i represents the direct N2O emission from the sewage treatment system on day i (kgN2O), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), TN in_i represents the average influent TN concentration of the sewage treatment system on day i (mg / L), TN out_i represents the average TN concentration of the sewage treatment system at day i (mg / L), EF N2O represents the N2O emission factor, which is 0.016 (kgN2O-N / kgTN), C N2O / N2 It represents the mass conversion coefficient of N2O / N2, and its value is 44 / 28.

[0081] Furthermore, the calculation formula for indirect carbon emissions during the facility construction phase is as follows:

[0082]

[0083] In the above formula, C 0E Indicates the indirect carbon emissions during the facility operation phase (kg CO2eq), E i represents the consumption of the i-th type of purchased electricity (kWh), EF E_i represents the carbon emission factor of the i-th resource (kgCO2eq / kWh); F j represents the consumption of the jth fuel (kg), EF F_j represents the carbon emission factor of the jth fuel (kgCO2eq / kg); CH k Indicates the consumption of the kth chemical agent (kg), EF CH_k represents the carbon emission factor of the kth chemical (kgCO2eq / kg); B l Indicates the consumption of the first type of construction material (kg), EF B_l The carbon emission factor (kgCO2eq / kg) of the first type of construction material is shown in Table 1 below.

[0084] Table 1: Main carbon emission factors

[0085]

[0086]

[0087] Specifically, the facility operation phase lasts from the official start of facility operation and maintenance to the cessation of operation. Facility operation data mainly include power consumption of various electrical equipment, changes in inlet and outlet water volume and water quality, chemical agent consumption, and vehicle power fuel consumption. The power consumption of electrical equipment in sewage treatment facilities can be obtained directly from the electricity meter or the operation records of sewage treatment facilities. The inlet and outlet water volume and COD and TN water quality changes of sewage treatment facilities can be directly collected, transmitted, and calculated from the operation records, testing / monitoring of sewage treatment facilities. The usage data of chemical agents such as methanol, PAC, and lime can be collected and transmitted from the operation records of sewage treatment plants. Power fuel energy consumption mainly refers to the power fuel energy consumption of operation and maintenance inspection vehicles. For example, the usage of gasoline and diesel can be collected and transmitted from vehicle usage records. Social and natural development indicators such as vegetation type, area, and population size within the site can be obtained through design drawings and engineering construction data.

[0088] The calculation formula for carbon emissions during the facility operation phase is as follows:

[0089]

[0090] In the above formula, Co represents the carbon emissions during the facility operation phase (kg CO2eq), C 0D_i represents the direct carbon emissions during the operation phase of the i-th facility, C OI_i represents the indirect carbon emissions during the operation phase of the i-th facility; C p _i represents the amount of carbon dioxide absorbed and stored from the air by greenery and vegetation within the scope of the i-th set of facilities (mainly treatment sites and pumping stations); C p v_i is the power generation kWh of the photovoltaic system in the i-th facility.

[0091] Furthermore, the calculation formula for direct carbon emissions during the facility operation phase is as follows:

[0092]

[0093] In the above formula, C OD Indicates the direct carbon emissions during the facility operation phase (kg CO2eq), E C，CH4_i represents the direct carbon emission of CH4 emitted from the collection and transportation system of the pipeline network on day i (kg CO2eq), E S，CH4_i represents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2eq), E S，N2O_i represents the direct carbon emission of N2O discharged from the sewage treatment system on day i (kg CO2eq).

[0094] The CH4 carbon emissions from the sewage collection and transportation system are calculated using the following formula.

[0095] E C，CH4_i=C CH4_i ×GWP CH4

[0096] In the above formula, E C，CH4_i represents the direct carbon emissions of CH4 from the sewage collection and transportation system on day i (kg CO2eq), GWP CH4 It represents the global warming potential of CH4, which is 28.

[0097] Furthermore, the direct CH4 emissions from the sewage collection and transportation system can be calculated using the following formula.

[0098] C CH4_i =[Q i ×(COD in_i -COD out_i )÷1000-S i ]×B0×MCF i

[0099] In the above formula, C CH4_i represents the direct CH4 emission from the sewage collection and transportation system on day i (kgCH4), Q i represents the amount of water collected and transported by the sewage collection and transport system on day i (m 3 ), COD in_i represents the average influent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), COD out_i represents the average effluent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed by ditch sludge treatment on day i (kgCOD Cr ), B O Indicates the maximum methane production capacity of organic matter, with a value of 0.25 (kgCH4 / kgCOD Cr ), MCFi represents the methane correction factor.

[0100] Preferably, if conditions are limited, it can be assumed that under standard conditions, 1 kg COD is equivalent to 1000 / 64=15.625 mol methane, which is converted into a weight of approximately 250 g and a volume of 15.625*22.4=350 L under standard conditions.

[0101] The CH4 emissions from the sewage treatment system can be calculated using the following formula.

[0102] E S，CH4_i =S CH4_i ×GWP CH4

[0103] In the above formula, E S，CH4_irepresents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2eq), GWP CH4 It represents the global warming potential of CH4, which is 28.

[0104] Furthermore, the direct CH4 emissions from the sewage treatment system can be calculated using the following formula.

[0105] S CH4_i =[Q i ×(COD in_i -COD out_i )÷1000-S i ]×B0×MCF i

[0106] In the above formula, C CH4_i represents the direct CH4 emission from the sewage treatment system on day i (kgCH4), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), COD in_i represents the average influent COD of the sewage treatment system on day i Cr Concentration (mg / L), COD out_i represents the average effluent COD of the sewage treatment system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed in the form of sludge treatment on day i (kgCOD Cr ), B O Indicates the maximum methane production capacity of organic matter, with a value of 0.25 (kgCH4 / kgCOD Cr ), MCF i It represents the methane correction factor. The default value for aerobic treatment processes such as AO is 0.01, the default value for treatment processes based on anaerobic treatment processes or constructed wetlands is 0.1, and the default value for aerobic and anaerobic combined processes is 0.05.

[0107] The direct carbon emissions of N2O from sewage treatment systems can be calculated using the following formula.

[0108] E N2O_i =S N2O_i ×GWP N2O

[0109] In the above formula, E N2O_i represents the direct carbon emission of N2O from the sewage treatment system on day i (kg CO2eq), GWP N2O It represents the global warming potential of N2O, and its value is 265.

[0110] Furthermore, the direct N2O emissions from the sewage treatment system can be calculated using the following formula.

[0111] SN2O_i =[Q i ×(TN in_i -TN out_i )÷1000]×EF N2O ×C N2O / N2

[0112] In the above formula, S N2O_i represents the direct N2O emission from the sewage treatment system on day i (kgN2O), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), TN in_i represents the average influent TN concentration of the sewage treatment system on day i (mg / L), TN out_i represents the average TN concentration of the sewage treatment system at day i (mg / L), EF N2O represents the N2O emission factor, which is 0.016 (kgN2O-N / kgTN), C N2O / N2 It represents the mass conversion coefficient of N2O / N2, and its value is 44 / 28.

[0113] Furthermore, the calculation formula for indirect carbon emissions during the facility operation phase is as follows:

[0114]

[0115] In the above formula, C 0E Indicates the indirect carbon emissions during the facility operation phase (kg CO2eq), E i represents the consumption of the i-th type of purchased electricity (kWh), EF E_i represents the carbon emission factor of the i-th resource (kgCO2eq / kWh); F j represents the consumption of the jth fuel (kg), EF F_j represents the carbon emission factor of the jth fuel (kgCO2eq / kg); CH k Indicates the consumption of the kth chemical agent (kg), EF CH_k represents the carbon emission factor of the kth chemical (kgCO2eq / kg); B l Indicates the consumption of the first type of construction material (kg), EF B_l The carbon emission factor (kgCO2eq / kg) of the first type of construction material is shown in Table 1 below.

[0116] Specifically, the facility demolition phase is from the start of the project to the completion and acceptance of the project. The facility demolition data mainly includes the purchased electricity consumed during the use of power tools, and the gasoline, diesel and other fuels consumed during the use of mechanical equipment such as excavators and transport vehicles. These can be obtained through design and engineering construction data, and the carbon emissions during the demolition phase can be calculated.

[0117] During the demolition process, sewage treatment facilities no longer collect, transport and treat sewage, and direct emissions are not calculated.

[0118] The calculation formula for carbon emissions during the facility dismantling phase is as follows:

[0119]

[0120] In the above formula, C R represents the carbon emissions during the facility demolition phase (kg CO2eq / m3), C RE_i represents the indirect carbon emissions during the dismantling phase of the i-th facility.

[0121] Furthermore, the calculation formula for indirect carbon emissions during the facility dismantling phase is as follows:

[0122]

[0123] In the above formula, C RE represents the indirect carbon emissions during the facility dismantling phase (kg CO2eq), E i represents the consumption of the i-th type of purchased electricity (kWh), EF E_i represents the carbon emission factor of the i-th resource (kgCO2eq / kWh); F j represents the consumption of the jth fuel (kg), EF F_j represents the carbon emission factor of the jth fuel (kgCO2eq / kg); B l Indicates the consumption of the first type of construction material (kg), EF B_i The carbon emission factor (kgCO2eq / kg) of the first type of construction material is shown in Table 1 below.

[0124] Based on the carbon emissions of different facilities and different stages mentioned above, the total carbon emissions of the sewage treatment life cycle are determined. The calculation formula is as follows:

[0125]

[0126] In the above formula, C F represents the total carbon emissions of rural sewage treatment facilities over their entire life cycle (kgCO2eq), C C_i represents the carbon emissions during the construction phase of the i-th facility (kgCO2eq), C O_j represents the carbon emissions of the jth facility during its operation phase (kgCO2eq), C R_k represents the carbon emissions during the dismantling phase of the kth facility (kgCO2eq).

[0127] S3. Determine the total carbon emissions of the sub-area based on the total carbon emissions from sewage treatment.

[0128] Among them, the carbon emissions of several sewage treatment facilities in the sub-area are calculated in aggregate. The calculation formula for the total carbon emissions Csub of sub-area m is as follows:

[0129]

[0130] In the above formula, C sub represents the sum of the carbon emissions of several rural sewage treatment facilities in the sub-area over their entire life cycle (kgCO2eq), C E_l represents the total carbon emissions of the first facility throughout its life cycle (kgCO2eq), C O_j represents the carbon emissions of the jth facility during its operation phase (kgCO2eq), C R_k represents the carbon emissions during the dismantling phase of the kth facility (kgCO2eq).

[0131] S4. Determine the total carbon emissions of the target research area based on the total carbon emissions of the above sub-areas.

[0132] Among them, carbon emissions of several sub-areas in the target study area are summarized and calculated, and the total carbon emissions of the target study area C rural The calculation formula is as follows:

[0133]

[0134] In the above formula, C rural represents the sum of carbon emissions from several sub-areas in the target study area (kgCO2eq), C sub_m Indicates the total carbon emissions of the mth sub-area period (kgCO2eq).

[0135] S5. Evaluate the carbon emissions of the rural sewage treatment facilities based on the total carbon emissions of the sewage treatment, the total carbon emissions of the sub-areas and the total carbon emissions of the target study area.

[0136] Among them, Figure 2 As shown in the figure, the main life cycle theoretical model is used to calculate the carbon emissions of rural sewage treatment facilities throughout their life cycle. The carbon emissions evaluation is carried out in combination with the emission factor method and the mass balance method. The carbon emissions are calculated based on the greenhouse gas emissions of the entire process of sewage collection, transportation and treatment, including sewage collection and transportation carbon emissions and sewage treatment carbon emissions. The total carbon emissions of the sub-area and the total carbon emissions of the target study area are then calculated. The total carbon emissions of sewage treatment, the total carbon emissions of the sub-area and the total carbon emissions of the target study area are used as the evaluation results of the carbon emissions of the above-mentioned rural sewage treatment facilities.

[0137] Example 2

[0138] This embodiment provides a device for calculating the carbon emissions of rural sewage treatment facilities throughout their life cycle. Figure 2 As shown, including:

[0139] The data collection module is used to collect and verify original data from each stage of facility construction, operation, and demolition.

[0140] Furthermore, the scope of the target study area is determined and divided into sub-areas.

[0141] Furthermore, a data collection submodule is built during the facility construction phase to collect data on purchased electricity, fuel consumption, construction material consumption, chemical agent consumption, and social and natural development during the construction phase.

[0142] Furthermore, a data collection submodule is built during the facility operation phase to collect data on purchased electricity, fuel consumption, chemical agent consumption, and social and natural development during the operation phase.

[0143] Furthermore, a data collection submodule is built during the facility demolition phase to collect data on purchased electricity, fuel consumption, and social and natural development during the demolition phase.

[0144] Furthermore, the data collection module verifies the data in terms of authenticity, accuracy and completeness. If it meets the requirements, it can be used for carbon emission accounting; if it does not meet the requirements, the collected data needs to be reviewed or re-collected.

[0145] The carbon emission calculation module calculates the direct carbon emissions, indirect carbon emissions and total carbon emissions of sewage treatment facilities throughout their life cycle based on a full life cycle carbon emission accounting method for rural sewage treatment facilities. It includes: a calculation sub-module for the facility construction phase, a calculation sub-module for the facility operation phase, a calculation sub-module for the facility demolition phase, and a sub-module for calculating the total carbon emissions of the facility throughout its life cycle.

[0146] Furthermore, the facility construction phase calculation submodule is used to calculate according to the collected construction phase indicators to obtain the carbon emissions during the facility construction phase.

[0147] Furthermore, the facility operation phase calculation submodule is used to calculate according to the collected operation phase indicators to obtain the carbon emissions during the operation phase.

[0148] Furthermore, the facility demolition stage calculation submodule is used to calculate according to the collected demolition stage indicators to obtain the carbon emissions of the facility demolition stage.

[0149] Furthermore, the submodule for calculating the total carbon emissions during the entire life cycle of the facility is used to calculate based on the carbon emissions during the facility construction, the carbon emissions during the facility operation phase, and the carbon emissions during the facility demolition phase, thereby obtaining the total carbon emissions during the entire life cycle of the rural sewage treatment facility.

[0150] Based on the original data of each stage mentioned above, the carbon emissions of the facility collection, transportation and treatment systems are determined, and the total carbon emissions of each sub-area are further determined based on the carbon emissions of the sewage treatment facilities. Finally, the total carbon emissions of the target study area are determined based on the total carbon emissions of the above sub-areas.

[0151] The statistical analysis module is used to obtain the total carbon emissions from sewage treatment in the target assessment area, the total carbon emissions at each stage of the sewage treatment facility's life cycle, the comparison of carbon emissions in each sub-area, the relationship between the scale of sewage treatment sites and carbon emissions, and the comparison of carbon emissions from different sewage treatment processes through statistical analysis methods based on the calculation results of the calculation module.

[0152] The result output module is used to output the statistical analysis results.

[0153] Example 3

[0154] This embodiment provides a computer device, including a memory and a processor, wherein the processor is configured to read instructions stored in the memory to execute a method for quantitatively evaluating carbon emissions of rural sewage treatment facilities in the above embodiment.

[0155] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0156] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0157] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0158] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0159] Example 4

[0160] This embodiment also provides a computer-readable storage medium storing computer-executable instructions capable of executing a method for quantitatively evaluating carbon emissions from urban sewage treatment facilities in any of the above-mentioned method embodiments. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); the storage medium may also include a combination of the above-mentioned types of memory.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. The full life cycle accounting method for carbon emissions from rural sewage treatment facilities is characterized by: The whole life cycle carbon emission accounting device for rural sewage treatment facilities is used for the calculation. The device includes a data acquisition module, which is used to collect carbon emission indicators during the construction, operation and demolition stages of facilities in the target study area, including a facility construction stage data acquisition submodule, a facility operation stage data acquisition submodule, and a facility demolition stage data acquisition submodule; A calculation module, connected to the data acquisition module, for calculating the total carbon emissions of rural sewage treatment facilities over their entire life cycle using a carbon emissions life cycle accounting method based on data provided by the acquisition module; A statistical analysis module, connected to the calculation module, is used to obtain, based on the calculation results of the calculation module, the following through statistical analysis methods: the total carbon emissions from sewage treatment in the target assessment area, the total carbon emissions during the construction, operation, and demolition stages of the sewage treatment facility's entire life cycle, a comparison of carbon emissions in each sub-area, the relationship between the scale of different sewage treatment sites and carbon emissions, and analysis, comparison, and accounting of carbon emissions from different sewage treatment processes; It also includes a result output module, which is connected to the statistical analysis module and is used to output the statistical analysis results; The method specifically includes: Collect data from the construction, operation, and demolition stages of rural sewage treatment facilities, and determine the carbon emissions during the construction, operation, and demolition stages of the facilities based on the collected data; Carbon emissions from rural sewage treatment facilities are divided into two types: direct emissions and indirect emissions. Direct emissions are greenhouse gas emissions directly generated by sewage treatment facilities, including CH4 and N2O greenhouse gas emissions generated during sewage collection, transportation, and biochemical treatment. Indirect emissions are CO2 greenhouse gas emissions corresponding to energy and resource consumption during the construction, operation, and demolition of sewage treatment facilities, mainly including greenhouse gas emissions corresponding to the consumption of purchased electricity, power fuels, construction materials, and chemical agents. They are expressed in kilograms of carbon dioxide equivalent per cubic meter (kg CO2 eq / m 3 ), where the calculation formula for carbon emissions during the facility construction phase is as follows: ； In the above formula, represents the carbon emissions during the facility construction phase (kg CO2 eq), represents the direct carbon emissions during the construction phase of the i-th facility, represents the indirect carbon emissions during the construction phase of the i-th facility.

2. A method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities according to claim 1, characterized in that: The calculation formula for direct carbon emissions during the trial operation phase of the facility construction phase is as follows: ； In the above formula, represents the direct carbon emissions during the facility construction phase (kg CO2 eq), represents the direct carbon emission of CH4 emitted from the collection and transportation system of the pipeline network on day i (kg CO2 eq), represents the direct carbon emission of CH4 from the sewage treatment system on day i (kg CO2 eq), represents the direct carbon emission of N2O discharged from the sewage treatment system on day i (kg CO2 eq); The CH4 carbon emissions from the sewage collection and transportation system are calculated as follows: ； In the above formula, represents the direct carbon emissions of CH4 from the sewage collection and transportation system on day i (kg CO2 eq), represents the global warming potential of CH4, which is 28; The direct CH4 emissions from the sewage collection and transportation system are calculated as follows: ； In the above formula, represents the direct CH4 emission from the sewage collection and transportation system on day i (kgCH4), Q i represents the amount of water collected and transported by the sewage collection and transport system on day i (m 3 ), represents the average influent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), represents the average effluent COD of the sewage collection and transportation system on day i Cr Concentration (mg / L), S i represents the amount of organic matter removed by ditch sludge treatment on day i (kgCOD Cr ), B O Indicates the maximum methane production capacity of organic matter, with a value of 0.25 (kgCH4 / kgCOD Cr ), MCF i represents the methane correction factor.

3. The method for calculating carbon emissions from rural sewage treatment facilities throughout their life cycle according to claim 1 is characterized in that: The direct N2O emissions from the sewage treatment system are calculated as follows: ； In the above formula, represents the direct N2O emission from the sewage treatment system on day i (kgN2O), Q i represents the amount of water treated by the sewage treatment system on day i (m 3 ), represents the average influent TN concentration of the sewage treatment system on day i (mg / L), represents the average TN concentration of the sewage treatment system in the effluent on day i (mg / L), It represents the N2O emission factor, which is 0.016 (kgN2O-N / kgTN). It represents the mass conversion coefficient of N2O / N2, and its value is 44 / 28.

4. The method for calculating carbon emissions from rural sewage treatment facilities throughout their life cycle according to claim 1 is characterized in that: The calculation formula for indirect carbon emissions during the facility construction phase is as follows: ； In the above formula, C OE Indicates the indirect carbon emissions during the facility operation phase (kg CO2 eq), represents the consumption of the i-th purchased electricity (kWh), represents the carbon emission factor of the i-th resource (kgCO2eq / kWh); F j represents the consumption of the jth fuel (kg), EF F_j represents the carbon emission factor of the jth fuel (kgCO2eq / kg); represents the consumption of the kth chemical agent (kg), represents the carbon emission factor of the kth chemical (kgCO2eq / kg); Indicates the consumption of the first type of construction material (kg), Indicates the carbon emission factor of the first type of construction material (kgCO2eq / kg).

5. A method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities according to claim 1, characterized in that: The facility construction phase data collection submodule is used to collect: the construction phase purchased electricity consumption data, power fuel consumption data, construction material consumption data, water inlet and outlet water volume and water quality data during the trial operation period, methanol, PAC, and lime chemical consumption data; the facility operation phase data collection submodule and the facility demolition phase data collection submodule are both used to collect: the operation phase purchased electricity consumption data, power fuel consumption data, water inlet and outlet water volume and water quality data, methanol, PAC, and lime chemical consumption data, and vegetation type, area, and population size data within the site.

6. A method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities according to claim 1, characterized in that: The calculation module includes: a facility construction phase calculation submodule, a facility operation phase calculation submodule, a facility demolition phase calculation submodule and a facility full life cycle carbon emission calculation submodule; the facility construction phase calculation submodule is used to perform calculations based on the collected construction phase data, and summarize the carbon emissions of the facility construction phase; the facility operation phase calculation submodule is used to perform calculations based on the collected operation phase data, and summarize the carbon emissions of the operation phase; the facility demolition phase calculation submodule is used to perform calculations based on the collected demolition phase data, and summarize the carbon emissions of the facility demolition phase; the facility full life cycle carbon emission calculation submodule is used to perform calculations based on the carbon emissions of the facility construction phase, the carbon emissions of the facility operation phase, and the carbon emissions of the facility demolition phase, and thus obtain the total carbon emissions of the rural sewage treatment facility over its full life cycle.

7. A method for calculating carbon emissions throughout the life cycle of rural sewage treatment facilities according to claim 1, characterized in that: The calculation module is also used to calculate the carbon emissions of rural sewage treatment facilities based on the total carbon emissions over the entire life cycle of the sewage treatment facilities and the total carbon emissions in the assessment area.

8. A computer device, characterized in that: The computer device includes a processor and a memory, the memory is used to store a computer program, the computer program includes a program, and the processor is configured to call the computer program to execute the steps of the method for full life cycle accounting of carbon emissions of rural sewage treatment facilities as described in any one of claims 1-7.

9. A computer-readable storage medium, characterized in that The computer storage medium stores a computer program, and the computer program is executed by a processor to implement the full life cycle accounting method for carbon emissions of rural sewage treatment facilities as described in any one of claims 1-7.

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