Energy-saving accounting improved resource recovery greenhouse effect carbon emission calculation method

Abstract

The invention discloses an energy-saving accounting improved resource recovery greenhouse effect carbon emission calculation method, and belongs to the crossing fields of environmental engineering, environmental management science, energy science, environmental economics, sustainable development and the like. The problems of low resource recovery efficiency and large carbon emission caused by the fact that components of household garbage and treatment modes corresponding to the components are not quantified in a traditional method for quantifying the carbon emission generated in the garbage treatment process are solved. The method comprises the following steps: firstly, determining the total mass of the mixed household garbage, dividing components, determining the garbage mass of each component, and calculating the total organic carbon content TOC of the mixed household garbage, the total degradable organic carbon content DOC of the mixed household garbage and the total degradable organic carbon content DOCSK of kitchen garbage which can be sorted out according to the household garbage mass ratio of each component; calculating the total amount of carbon emission in landfill, incineration and composting treatment modes; and summing the three components to obtain the total carbon emission. The method is mainly used for calculating the total carbon emission.

Description

Technical Field

[0001] The present invention belongs to the cross-fields of environmental engineering, environmental management, energy science, environmental economics and sustainable development. Background Art

[0002] With the rapid development of contemporary society and economy, domestic waste treatment faces new challenges of low-carbon emission reduction. In recent years, with the booming world economy, the generation of global domestic waste has continued to grow. According to the World Bank's forecast, by 2050, the annual domestic waste generated globally will reach 3.4 billion tons, an increase of about 70% compared to 2016. The release of greenhouse gases caused by carbon emissions from domestic waste treatment has aggravated the occurrence of extreme weather and the impact on the health of residents. The harmless treatment and resource utilization of domestic waste, as well as the sustainable transformation of urban resource needs, cannot be separated from the development of technology and the advancement of concepts. The calculation of carbon emissions in the domestic waste treatment process is based on the analysis and calculation of energy consumption and waste treatment methods to evaluate the impact of the waste treatment process on carbon emissions. The calculation aims to quantify the carbon emissions generated in the waste treatment process in order to identify emission reduction potential and formulate emission reduction strategies. However, this calculation relies on the evolution of energy consumption data, carbon emission coefficients and waste treatment methods, involves complex process parameters and mechanism processes, and is significantly affected by the composition and treatment methods of domestic waste. In urban-scale scenarios, the separation rate of organic waste in regional domestic waste significantly affects the resource recovery status and carbon emissions caused by terminal treatment. It is necessary to comprehensively calculate the carbon emissions from the treatment of domestic waste with different destinations, strengthen energy-saving accounting for the domestic waste resource recovery process, and realize the accuracy of greenhouse effect calculations.

[0003] Domestic waste treatment mainly consists of three main methods: incineration, landfill, and organic resource utilization. Among them, incineration has gradually become the mainstream method of domestic waste treatment in my country, and the current carbon emission calculations are mostly only for a single type of treatment method. The replacement of standard coal caused by the energy-saving process is not clearly considered, and the impact of different proportions of garbage classification on the post-treatment effect is not deeply considered, resulting in unclear environmental benefits caused by resource recovery efficiency and large errors in carbon emission calculations. It is worth noting that the resource recycling system for domestic waste is still under construction. Incineration and landfilling of domestic waste have caused huge potential waste of resources. It is necessary to strengthen the composition of domestic waste resource recovery and post-treatment methods in the post-treatment effect evaluation process. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the traditional method of quantifying the carbon emissions generated in the waste treatment process does not carefully quantify the components of domestic waste and the corresponding treatment methods of each component, resulting in unclear environmental benefits caused by resource recovery efficiency and large errors in carbon emissions calculation; the present invention provides a resource recovery greenhouse effect carbon emissions calculation method with energy-saving accounting improvements.

[0005] The method for calculating greenhouse carbon emissions from resource recycling improved by energy-saving accounting comprises the following steps:

[0006] Step 1: Determine the total mass W of mixed domestic waste excluding recyclable waste and hazardous waste in the area to be calculated. T0 , and the mass of the six components of domestic waste in the mixed domestic waste, among which the first to sixth components of domestic waste are: food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste, and the mass of the first to sixth components of domestic waste are W1, W2, W3, W4, W5, and W6 respectively; the mass of food waste that can be sorted out of the total food waste is W SK =α*W T0 , the mass of food waste that cannot be sorted out in the total food waste is W1-W SK , α is the separation rate of restaurant kitchen waste;

[0007] Step 2: Calculate the total organic carbon content (TOC) of the mixed domestic waste, the total degradable organic carbon content (DOC) of the mixed domestic waste, and the total degradable organic carbon content (DOC) of the kitchen waste that can be sorted out from the total kitchen waste according to the mass proportion of each component of the mixed domestic waste. SK ;

[0008] Step 3, based on the total degradable organic carbon content DOC of the mixed domestic waste, calculate the total carbon emissions of the mixed domestic waste formed by the food waste that cannot be sorted out and the domestic waste of the second to sixth components under the landfill treatment mode;

[0009] Step 4: Based on the total organic carbon content TOC of the mixed domestic waste, calculate the total carbon emissions from the incineration of the mixed domestic waste formed by the kitchen waste that cannot be sorted out and the domestic waste of the second to sixth components;

[0010] Step 5: Based on the total degradable organic carbon content (DOC) of the sorted food waste SK , calculate the total carbon emissions from composting of the sorted food waste;

[0011] Step 6: Sum the total carbon emissions under landfill treatment, the total carbon emissions under incineration treatment, and the total carbon emissions under composting treatment to obtain the total carbon emissions that cause the greenhouse effect.

[0012] Preferably,

[0013]

[0014]

[0015] DOC SK =DOC1=30%;

[0016] Among them, DOC j is the degradable organic carbon content of the jth component of domestic waste, j = 1, 2, ... 6, TOC j is the total organic carbon content of the jth component of domestic waste, dm j is the mass proportion of the jth component of domestic waste in the mixed domestic waste;

[0017] dm1=(W1-W SK ) / (W T0 -W SK );

[0018] dm2=W2 / (W T0 -W SK );

[0019] dm3=W3 / (W T0 -W SK );

[0020] dm4=W4 / (W T0 -W SK );

[0021] dm5=W5 / (W T0- W SK );

[0022] dm6=W6 / (W T0 -W SK );

[0023] W1, W2, W3, W4, W5 and W6 are the masses of food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste respectively.

[0024] Preferably, TOC1=31%, TOC2=41%, TOC3=60%, TOC4=99%, TOC5=33%, TOC6=47%, DOC1=30%, DOC2=40%, DOC3=40%, DOC4=0, DOC5=33%, DOC6=0.

[0025] Preferably, the total carbon emissions from landfill of mixed domestic waste include:

[0026]

[0027]

[0028] GHGL eu =P L ×(W T0- W SK )×(EL e +EL d ) / 3.6 / M coal / GHG coal ;

[0029]

[0030] in, and It is the mass of carbon dioxide released during landfilling and the carbon dioxide equivalent of the greenhouse effect caused by methane; GHGL eu It is the carbon dioxide equivalent released by the diesel and standard coal consumed in the landfill process; GHGL es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of landfill biogas recovery and power generation; P L is the proportion of mixed waste entering the landfill system; DOC F is the empirical value of the actual decomposition of total carbon in the landfill process; F1 and F2 are the ratios of carbon dioxide and methane in landfill gas, respectively; MCF SA is the correction factor for methane production in sanitary landfill scenario; R is the proportion of methane recovered during landfill; is the global warming potential factor of methane; EL e With EL d They are the amount of electricity and diesel used per ton of mixed domestic waste treated during landfilling; is the methane gas density; is the power generation per unit of methane; M coal is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

[0031] Preferably, R = 0.8 or R = 0, F = 0.77, F1 = 0.45, F2 = 0.55, MCF SA =0.65, EL e =57.67MJ,EL d =53.7MJ, M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0032] Preferably, when the landfill method is sanitary landfill, the value of R is 0.8; when the landfill method is unsanitary landfill, the value of R is 0.

[0033] Preferably, the total carbon emissions from the incineration of mixed domestic waste include:

[0034]

[0035]

[0036] GHGI eu =P I ×(W T0- W SK )×(EI e +EI d ) / 3.6 / M coal / GHG coal ;

[0037] GHGI es =P I ×(W T0- W SK )×E f ×E er / 3.6 / M coal / GHG coal ;

[0038] in, and It is the carbon dioxide equivalent of the mass of carbon dioxide released during incineration and the greenhouse effect caused by nitrous oxide; GHGI eu It is the carbon dioxide equivalent released by the consumption of diesel and standard coal in the process of incineration of power generation; GHGI es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of incineration power generation; P I is the proportion of garbage entering the incineration system, OF is the combustion degree coefficient; is the mass of nitrous oxide produced per ton of waste incinerated; is the global warming potential factor of nitrous oxide; EI e With EI d are the amount of electricity and diesel used per ton of mixed domestic waste during incineration; E f is the equivalent factor of fossil energy; E er is the electricity that enters the grid after each ton of domestic waste is incinerated; Mcoal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

[0039] Preferably, OF=100% or OF=60%, EI e =293.23MJ, EI d =32.14MJ, E f =1.1, E er =280kW·h,M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0040] Preferably, the total carbon emissions of the food waste that can be sorted out from the total food waste under composting treatment include:

[0041]

[0042]

[0043]

[0044] GHGC eu =P L ×W SK ×(EC e +EC d ) / 3.6 / M coal / GHG coal ;

[0045] GHGC es =P L ×W SK ×E f ×EC er / 3.6 / M coal / GHG coal ;

[0046] in, and are the mass of carbon dioxide produced by composting, the carbon dioxide equivalent of the greenhouse effect caused by methane, and the carbon dioxide equivalent of the greenhouse effect caused by nitrous oxide; η is the degradation rate of DOC during composting; m RDF is the mass of derived fuel produced per ton of food waste used for composting; and are the production of carbon dioxide and nitrous oxide per ton of derived fuel during combustion and power generation, respectively; OM is the organic matter content; and are the masses of methane and nitrous oxide in the gas produced per ton of food waste used for composting; EC e With EC d are the electricity and diesel used per ton of food waste for composting during the composting process; E f is the equivalent factor of fossil energy; EC er It is the electricity generated by the derived fuels after composting each ton of food waste and then incinerated and fed into the grid; M coal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the power generation process of burning unit mass of standard coal; and are the global warming potential factors of methane and nitrous oxide, respectively.

[0047] Preferably, η=0.5, m RDF =0.4t, OM=0.2,G CH4 =4kg, G N2O =0.3kg,EC e =181.91MJ,EC d =190.55MJ, E f =1.1,EC er =1680MJ,M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0048] The effects of the present invention are mainly reflected in the following three points:

[0049] (1) Aiming at the garbage classification scenario, the impact mechanism of garbage classification status on the composition of domestic waste is introduced into the calculation process of carbon emission accounting. Based on the differences in garbage separation rates, the changes in carbon content of garbage entering different process flows in the differentiated treatment of domestic waste and resource recycling are explored.

[0050] (2) In view of the current mainstream garbage classification and treatment methods, a comprehensive resource recovery greenhouse effect list including landfill, incineration and composting is proposed, and the scenarios of simple landfill and simple incineration under extensive management are considered, which has the versatility of the greenhouse effect calculation process.

[0051] (3) The energy consumption of waste treatment and the energy saving of resource recovery are comprehensively considered under the influence of differences in the components of waste classification scenarios during the process of recycling domestic waste resources. Compared with the traditional greenhouse effect calculation method that only considers process carbon emissions, it emphasizes the potential resource benefits of composting and incineration, and obtains more accurate carbon emission calculation results.

[0052] The energy-saving accounting improved resource recovery greenhouse effect carbon emission calculation method described in the present invention proposes a greenhouse effect calculation framework that includes multiple types of garbage treatment processes from the perspective of garbage classification, improves the convenience of the calculation process, provides a decision-making support solution for the green and sustainable development of the domestic garbage treatment process, quantifies the components of domestic garbage and the corresponding treatment methods of each component, improves resource recovery efficiency, and reduces carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the principle of the resource recycling greenhouse effect carbon emission calculation method improved by energy-saving accounting according to the present invention;

[0054] Figure 2 A schematic diagram of carbon emissions from mixed domestic waste treatment based on the method of the present invention under four scenarios is obtained; the nitrous oxide and methane produced in each scenario in the figure are converted into carbon dioxide equivalents. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0056] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0057] The present invention is based on the three mainstream waste treatment methods of incineration, landfill and composting, and comprehensively considers the resource saving and carbon emission construction caused by power generation and resource recycling. By strengthening the carbon emission reduction calculation of standard coal resource conservation, it strengthens the emphasis on the resource value in the greenhouse effect accounting process, and constructs a greenhouse effect calculation method in which the energy-saving accounting process of urban resource recycling in the waste classification scenario is improved. It supports the precise calculation of the greenhouse effect of waste resource recycling in the waste classification scenario of organic domestic waste separation. The following implementation methods are specifically provided, as follows:

[0058] See also Figure 1 Specific implementation method 1 is described. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting in this implementation method 1 includes the following steps:

[0059] Step 1. In combination with the mainstream principle of the four-division of domestic waste, define the destination of various components of domestic waste. Urban domestic waste generally first separates recyclables to maximize resource recovery and recycling; separates hazardous waste to prevent environmental pollution and protect human health; finally separates food waste, and leaves other waste to increase the calorific value of incineration. Among them, food waste and other waste are the main types of waste that enter the three mainstream treatment methods of incineration, landfill, and composting, while the output of recyclables and hazardous waste is small and requires professional institutions to handle and dispose of them. Therefore, the present invention only considers large-scale kitchen waste and other waste.

[0060] Therefore, determine the total mass W of mixed domestic waste excluding recyclable waste and hazardous waste in the area to be calculated. T0 , and the mass of the six components of domestic waste in the mixed domestic waste, among which the first to sixth components of domestic waste are: food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste, and the mass of the first to sixth components of domestic waste are W1, W2, W3, W4, W5, and W6 respectively; the mass of food waste that can be sorted out of the total food waste is W SK =α*W T0 , the mass of food waste that cannot be sorted out in the total food waste is W1-W SK , α is the separation rate of restaurant kitchen waste;

[0061] In specific applications, W1 to W6 can be obtained by sampling the entire unsorted garbage.

[0062] As mentioned above, the food waste that can be sorted out is sent to the organic waste composting treatment facility for composting treatment, while the mixed domestic waste formed by the food waste that cannot be sorted out and the domestic waste of the second to sixth components is sent to the incineration or landfill facilities. The allocation ratio of the incineration or landfill facilities is determined according to the current status of the treatment capacity of the two types of facilities in the region, and the ratios are P and P, respectively. L With P I .

[0063] Step 2: Calculate the carbon content of each type of domestic waste. Different types of waste have different carbon contents, so the carbon emissions in different treatment processes are also different. According to the mass proportion of each component of the mixed domestic waste, calculate the total organic carbon content TOC of the mixed domestic waste, the total degradable organic carbon content DOC of the mixed domestic waste, and the total degradable organic carbon content DOC of the kitchen waste that can be sorted out of the total kitchen waste. SK ;

[0064] The degradable organic carbon DOC in the total organic carbon TOC can be biologically treated and gradually release greenhouse gases during the landfill process, while the remaining non-organic carbon is only released as carbon dioxide during sufficient incineration treatment. Therefore, it is necessary to calculate the total carbon and organic carbon ratio of domestic waste with different compositions.

[0065] Furthermore,

[0066]

[0067]

[0068] DOC SK =DOC1=30%;

[0069] Among them, DOC j is the degradable organic carbon content of the jth component of domestic waste, j = 1, 2, ... 6, TOC j is the total organic carbon content of the jth component of domestic waste, dm j is the mass proportion of the jth component of domestic waste in the mixed domestic waste;

[0070] dm1=(W1-W SK ) / (W T0 -W SK );

[0071] dm2=W2 / (W T0 -W SK );

[0072] dm3=W3 / (W T0 -W SK );

[0073] dm4=W4 / (W T0 -W SK );

[0074] dm5=W5 / (W T0- W SK );

[0075] dm6=W6 / (W T0 -W SK );

[0076] W1, W2, W3, W4, W5 and W6 are the masses of food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste respectively.

[0077] Table 1 gives the total organic carbon content and total degradable organic carbon content of domestic waste with different components, as follows:

[0078] Table 1 Total organic carbon content and degradable organic carbon content of domestic waste with different components

[0079] Type of garbage TOC Symbol TOC(%) DOC symbol DOC(%) Food waste <![CDATA[TOC1]]> 31 <![CDATA[DOC1]]> 30 Paper waste <![CDATA[TOC2]]> 41 <![CDATA[DOC2]]> 40 Cloth fiber waste <![CDATA[TOC3]]> 60 <![CDATA[DOC3]]> 40 Plastic waste <![CDATA[TOC4]]> 99 <![CDATA[DOC4]]> 0 Bamboo and wood garbage <![CDATA[TOC5]]> 33 <![CDATA[DOC5]]> 33 Other types of garbage <![CDATA[TOC6]]> 47 <![CDATA[DOC6]]> 0

[0080] Step 3, based on the total degradable organic carbon content DOC of the mixed domestic waste, calculate the total carbon emissions of the mixed domestic waste formed by the food waste that cannot be sorted out and the domestic waste of the second to sixth components under the landfill treatment mode;

[0081] As a preferred embodiment, the total carbon emissions from landfill treatment of mixed domestic waste include:

[0082]

[0083]

[0084] GHGL eu =P L ×(W T0- W SK )×(EL e +EL d ) / 3.6 / M coal / GHG coal ;

[0085]

[0086] in, and It is the mass of carbon dioxide released during landfilling and the carbon dioxide equivalent of the greenhouse effect caused by methane; GHGL eu It is the carbon dioxide equivalent released by the diesel and standard coal consumed in the landfill process; GHGL es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of landfill biogas recovery and power generation; P L is the proportion of mixed waste entering the landfill system; DOC F is the empirical value of the actual decomposition of total carbon in the landfill process; F1 and F2 are the ratios of carbon dioxide and methane in landfill gas, respectively; MCF SA is the correction factor for methane production in sanitary landfill scenario; R is the proportion of methane recovered during landfill;

[0087] is the global warming potential factor of methane;

[0088] EL e With EL d They are the amount of electricity and diesel used per ton of mixed domestic waste treated during landfilling; is the methane gas density; is the power generation per unit of methane; M coal is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

[0089] F=0.77, F1=0.45, F2=0.55, MCF SA =0.65, EL e =57.67MJ,EL d =53.7MJ, M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0090] When the landfill method is sanitary landfill, the value of R is 0.8; when the landfill method is unsanitary landfill, the value of R is 0.

[0091] The sanitary landfill is in contrast to the unsanitary landfill (i.e., traditional simple landfill). The unsanitary landfill refers to directly burying garbage without treatment after digging a pit; the sanitary landfill is to lay an anti-seepage isolation layer at the bottom of the landfill, discharge the generated garbage leachate for treatment, prevent the leachate from polluting groundwater and soil, and at the same time, conduct the biogas generated by garbage fermentation for utilization or reasonable discharge.

[0092] Step 4: Based on the total organic carbon content TOC of the mixed domestic waste, calculate the total carbon emissions from the incineration of the mixed domestic waste formed by the kitchen waste that cannot be sorted out and the domestic waste of the second to sixth components;

[0093] As a preferred implementation, the total carbon emissions from the incineration of mixed domestic waste include:

[0094]

[0095]

[0096] GHGI eu =P I ×(W T0- W SK )×(EI e +EI d ) / 3.6 / M coal / GHG coal ;

[0097] GHGI es =P I ×(W T0- W SK )×Ef ×E er / 3.6 / M coal / GHG coal ;

[0098] in, and It is the carbon dioxide equivalent of the mass of carbon dioxide released during incineration and the greenhouse effect caused by nitrous oxide; GHGI eu It is the carbon dioxide equivalent released by the consumption of diesel and standard coal in the process of incineration of power generation; GHGI es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of incineration power generation; P I is the proportion of garbage entering the incineration system, OF is the combustion degree coefficient; is the mass of nitrous oxide produced per ton of waste incinerated; is the global warming potential factor of nitrous oxide; EI e With EI d are the amount of electricity and diesel used per ton of mixed domestic waste during incineration; E f is the equivalent factor of fossil energy; E er is the electricity that enters the grid after each ton of domestic waste is incinerated; M coal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

[0099] As incineration power generation is saved, GHG coal =0.68t·CO2-eq / t·Coal-eq, where t stands for ton.

[0100] When the incineration is simple incineration, the energy saving calculation caused by power generation is not considered, and the simple incineration is often incomplete due to the lack of effective supervision. Therefore, the combustion degree coefficient OF is 60% for simple incineration, otherwise the combustion degree coefficient OF is 100% for sanitary incineration.

[0101] EI e =293.23MJ, EI d =32.14MJ, E f =1.1, E er =280kW·h,M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0102] Step 5: Based on the total degradable organic carbon content (DOC) of the sorted food waste SK, calculate the total carbon emissions from composting of the sorted food waste;

[0103] As a preferred embodiment, the total carbon emissions of the food waste that can be sorted out from the total food waste under composting treatment include:

[0104]

[0105]

[0106]

[0107] GHGC eu =P L ×W SK ×(EC e +EC d ) / 3.6 / M coal / GHG coal ;

[0108] GHGC es =P L ×W SK ×E f ×EC er / 3.6 / M coal / GHG coal ;

[0109] in, and are the mass of carbon dioxide produced by composting, the carbon dioxide equivalent of the greenhouse effect caused by methane, and the carbon dioxide equivalent of the greenhouse effect caused by nitrous oxide; η is the degradation rate of DOC during composting; m RDF is the mass of derived fuel produced per ton of food waste used for composting; and are the production of carbon dioxide and nitrous oxide per ton of derived fuel during combustion and power generation, respectively; OM is the organic matter content; and are the masses of methane and nitrous oxide in the gas produced per ton of food waste used for composting; EC e With EC d are the electricity and diesel used per ton of food waste for composting during the composting process; E f is the equivalent factor of fossil energy; EC er It is the electricity generated by the derived fuels after composting each ton of food waste and then incinerated and fed into the grid; M coal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the power generation process of burning unit mass of standard coal; and are the global warming potential factors of methane and nitrous oxide, respectively.

[0110] In the formula, 40% is the proportion of CO2 in the carbon-containing gas of compost;

[0111] Furthermore, η=0.5, m RDF =0.4t, OM=0.2,G CH4 =4kg, G N2O =0.3kg,EC e =181.91MJ,EC d =190.55MJ, E f =1.1,EC er =1680MJ,M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq.

[0112] Step 6: Sum the total carbon emissions under landfill treatment, the total carbon emissions under incineration treatment, and the total carbon emissions under composting treatment to obtain the total carbon emissions that cause the greenhouse effect.

[0113] The present invention is applied to the multi-scenario calculation process of greenhouse effect of urban domestic waste resource recycling under different domestic waste treatment process scenarios in the Bohai Rim region of my country. The specific implementation steps are as follows:

[0114] (1) First, we collected data on the amount of domestic waste treated in 43 cities around the Bohai Sea, as well as data on the separation of various types of domestic waste.

[0115] (2) A carbon emission calculation list for various domestic waste treatment processes was constructed, including carbon emission calculation formulas for five treatment modes: landfill, simple landfill, incineration, simple incineration, and composting.

[0116] (3) Based on the method of the present invention, the parameter setting of the carbon emission calculation process of each domestic waste treatment process is completed.

[0117] (4) Calculate carbon emissions based on the future improvement plan for food waste separation rate and rationally select the optimal planning plan for increasing organic waste treatment capacity

[0118] Scenario S1: Maintain the current waste treatment system ratio until 2040;

[0119] Scenario S2: A completely ideal scenario, assuming that starting from 2025, the Bohai Rim will achieve the goal of zero landfill and 35% food waste sorting rate, and maintain it continuously;

[0120] Scenario S3: Based on the overall development trend of domestic waste, the organic waste treatment capacity is steadily improved to achieve the highest local carbon emissions in 2030. Since the overall waste in the area is expected to increase by 42%, the global food waste sorting rate will be increased to more than 32% in 2030 and more than 46% in 2040.

[0121] Scenario S4: Based on the garbage growth trend in different regions, the percentage increase in organic food waste composting processing capacity is set according to local conditions, and the goal of achieving a steady decline in local carbon emissions after reaching the peak value in 2030 is achieved. The garbage sorting rate is increased year by year according to the average annual increase in local domestic garbage to ensure that carbon emissions are on a downward trend.

[0122] (5) The carbon emissions of four scenarios were obtained, such as Figure 2 As shown:

[0123] Depend on Figure 2 It can be seen that scenario S2 achieved the best effect, followed by scenario S4. Combined with the calculation process of this method, it is demonstrated that setting the percentage of increase in organic waste treatment capacity according to the garbage growth trend in different regions in accordance with local conditions is the best domestic waste facility planning scheme for controlling carbon emissions.

[0124] Depend on Figure 2 It can be seen that the carbon emissions under the S4 scenario dropped rapidly, which is closest to the most ideal S2 scenario. Since the method of the present invention fully considers the differentiated effects of factors such as garbage composition, garbage separation, and garbage treatment capacity in different regions on carbon emissions, it can obtain more accurate and detailed calculation results than the traditional carbon emission estimation method that produces a fixed amount of carbon dioxide emissions per ton of garbage; in addition, since this method emphasizes the carbon emission reduction benefits caused by energy conservation in the resource recovery process, the emission reduction effects of organic composting and garbage incineration are further enhanced in the method of the present invention. Therefore, the method of the present invention effectively demonstrates that the current landfill-based treatment facility configuration has caused a huge amount of garbage treatment carbon emissions. Improving the regional organic food waste treatment capacity according to local conditions is an effective means to control garbage treatment carbon emissions.

[0125] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A method for calculating greenhouse carbon emissions from resource recycling improved by energy-saving accounting, characterized in that: The method comprises the following steps: Step 1: Determine the total mass W of mixed domestic waste excluding recyclable waste and hazardous waste in the area to be calculated. T0 , and the mass of the six components of domestic waste in the mixed domestic waste, among which the first to sixth components of domestic waste are: food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste, and the mass of the first to sixth components of domestic waste are W1, W2, W3, W4, W5, and W6 respectively; the mass of food waste that can be sorted out of the total food waste is W SK =α*W T0 , the mass of food waste that cannot be sorted out in the total food waste is W1-W SK , α is the separation rate of restaurant kitchen waste; Step 2: Calculate the total organic carbon content (TOC) of the mixed domestic waste, the total degradable organic carbon content (DOC) of the mixed domestic waste, and the total degradable organic carbon content (DOC) of the kitchen waste that can be sorted out from the total kitchen waste according to the mass proportion of each component of the mixed domestic waste. SK ; Step 3, based on the total degradable organic carbon content DOC of the mixed domestic waste, calculate the total carbon emissions of the mixed domestic waste formed by the food waste that cannot be sorted out and the domestic waste of the second to sixth components under the landfill treatment mode; Step 4: Based on the total organic carbon content TOC of the mixed domestic waste, calculate the total carbon emissions from the incineration of the mixed domestic waste formed by the kitchen waste that cannot be sorted out and the domestic waste of the second to sixth components; Step 5: Based on the total degradable organic carbon content (DOC) of the sorted food waste SK , calculate the total carbon emissions from composting of the sorted food waste; Step 6: Sum the total carbon emissions under landfill treatment, the total carbon emissions under incineration treatment, and the total carbon emissions under composting treatment to obtain the total carbon emissions that cause the greenhouse effect.

2. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 1, characterized in that: dock SK =DOC1=30%; Among them, DOC j is the degradable organic carbon content of the jth component of domestic waste, j = 1, 2, ... 6, TOC j is the total organic carbon content of the j-th component of domestic waste, dmj is the mass proportion of the j-th component of domestic waste in the mixed domestic waste; dm1=(W1--W SK ) / (IN T0 -IN SK ); dm2=W2 / (W T0 -IN SK ); <h2 style=";text-align:left;direction:ltr">dm3 = W3 / (W<h2 style=";text-align:left;direction:ltr"> T0 <h2 style=";text-align:left;direction:ltr"> -W<h2 style=";text-align:left;direction:ltr"> sK <h2 style=";text-align:left;direction:ltr"> ); dm4=W4 / (W T0 -IN SK ); dm5=W5 / (W T0 -IN SK ); <h2 style=";text-align:left;direction:ltr">dm6 = W6 / (W<h2 style=";text-align:left;direction:ltr"> T0 <h2 style=";text-align:left;direction:ltr"> -W<h2 style=";text-align:left;direction:ltr"> SK <h2 style=";text-align:left;direction:ltr"> ); W1, W2, W3, W4, W5 and W6 are the masses of food waste, paper waste, cloth fiber waste, plastic waste, bamboo and wood waste and other types of waste respectively.

3. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 2, characterized in that: TOC1=31%, TOC2=41%, TOC3=60%, TOC4=99%, TOC5=33%, TOC6=47%, DOC1=30%, DOC2=40%, DOC3=40%, DOC4=0, DOC5=33%, DOC6=0.

4. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 1, characterized in that: The total carbon emissions from landfill of mixed domestic waste include: GHGL eu =P L ×(In T0 -IN sK )×(EL e +EL d ) / 3.6 / M coal / GHG coal ; in, and It is the mass of carbon dioxide released during landfilling and the carbon dioxide equivalent of the greenhouse effect caused by methane; GHGL eu It is the carbon dioxide equivalent released by the diesel and standard coal consumed in the landfill process; GHGL es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of landfill biogas recovery and power generation; P L is the proportion of mixed waste entering the landfill system; DOC F is the empirical value of the actual decomposition of total carbon in the landfill process; F1 and F2 are the ratios of carbon dioxide and methane in landfill gas, respectively; MCF SA is the correction factor for methane production in sanitary landfill scenario; R is the proportion of methane recovered during landfill; is the global warming potential factor of methane; EL e With EL d They are the amount of electricity and diesel used per ton of mixed domestic waste treated during landfilling; is the methane gas density; is the power generation per unit of methane; M coal The mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

5. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 4 is characterized in that: R = 0.8 or R = 0, F = 0.77, F1 = 0.45, F2 = 0.55, MCF SA = 0.65, EL e = 57.67 MJ, EL d = 53.7 MJ, M coal = 20.93 GJ / t, GHG coal = 0.68 t·CO2-eq / t·Coal-eq。 6. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 4, characterized in that: When the landfill method is sanitary landfill, the value of R is 0.8; when the landfill method is unsanitary landfill, the value of R is 0.

7. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 1, characterized in that: The total carbon emissions from the incineration of mixed domestic waste include: GHGI eu =P I ×(In T0 -IN SK )×(EI e +EI d ) / 3.6 / M coal / GHG coak ; GHGI es =P I ×(W T0 W SK )×E f ×E er / 3.6 / M coal / GHG coal ; in, and It is the carbon dioxide equivalent of the mass of carbon dioxide released during incineration and the greenhouse effect caused by nitrous oxide; GHGI eu It is the carbon dioxide equivalent released by the consumption of diesel and standard coal in the process of incineration of power generation; GHGI es It is the carbon dioxide equivalent reduced by the standard coal consumption saved in the process of incineration power generation; P I is the proportion of garbage entering the incineration system, OF is the combustion degree coefficient; is the mass of nitrous oxide produced per ton of waste incinerated; is the global warming potential factor of nitrous oxide; EI e With EI d are the amount of electricity and diesel used per ton of mixed domestic waste during incineration; E f is the equivalent factor of fossil energy; E er is the electricity that enters the grid after each ton of domestic waste is incinerated; M coal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the combustion of unit mass of standard coal in the power generation process.

8. The method for calculating greenhouse carbon emissions from resource recycling with improved energy-saving accounting according to claim 7, characterized in that: OF = 100% or OF = 60%, EI e = 293.23 MJ, EI d = 32.14 MJ, E f = 1.1, E er = 280 kW·h, M coal = 20.93 GJ / t, GHG coal = 0.68 t·CO2-eq / t·Coal-eq。 9. The method for calculating greenhouse carbon emissions from resource recycling by improving energy-saving accounting according to claim 1, characterized in that: The total carbon emissions from composting of food waste that can be sorted out from the total food waste include: GHGC eu =P L ×W SK ×(EC e +EC d ) / 3.6 / M coal / GHG coal ; GHGC es =P L ×W SK ×E f ×EC er / 3.6 / M coal / GHG coal ; in, and are the mass of carbon dioxide produced by composting, the carbon dioxide equivalent of the greenhouse effect caused by methane, and the carbon dioxide equivalent of the greenhouse effect caused by nitrous oxide; η is the degradation rate of DOC during composting; m RDF is the mass of derived fuel produced per ton of food waste used for composting; and are the production of carbon dioxide and nitrous oxide per ton of derived fuel during combustion and power generation, respectively; OM is the organic matter content; and are the masses of methane and nitrous oxide in the gas produced per ton of food waste used for composting; EC e With EC d are the electricity and diesel used per ton of food waste for composting during the composting process; E f is the equivalent factor of fossil energy; EC er It is the electricity generated by the derived fuels after composting each ton of food waste and then incinerated and fed into the grid; M coal It is the mass of standard coal consumed per unit energy; GHG coal It is the carbon dioxide equivalent released during the power generation process of burning unit mass of standard coal; and are the global warming potential factors of methane and nitrous oxide, respectively.

10. The method for calculating greenhouse carbon emissions from resource recycling with improved energy-saving accounting according to claim 9, characterized in that: η=0.5,m RDF =0.4t, OM=0.2,G CH4 =4kg,G N2O =0.3kg,EC e =181.91MJ,EC d =190.55MJ,E f =1.1,EC er =1680MJ,M coal =20.93GJ / t, GHG coal =0.68t·CO2-eq / t·Coal-eq。

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