A method and system for cascading waste resource disposal based on waste classification

Abstract

The invention discloses a method and system for cascading resource disposal of garbage based on garbage classification, which relates to the field of garbage disposal. The technical scheme thereof mainly comprises the following points: using biological treatment technology to treat restaurant garbage, and calculating the first product quantity of biodiesel, electricity and biofertilizer converted from the restaurant garbage; using material recovery technology to treat recyclable garbage, and calculating the second product quantity of recycled products converted from the recyclable garbage; using thermochemical treatment technology to treat non-recyclable inorganic waste, and calculating the third product quantity of electricity converted from the non-recyclable inorganic waste; constructing a capacity planning mathematical model with minimum processing cost as the target under the operating constraint conditions of garbage disposal; solving the capacity planning mathematical model, and obtaining the capacity planning schemes of the respective equipment of the biological treatment technology, the material recovery technology and the thermochemical treatment technology, and the capacity planning scheme of the carrying capacity of the garbage transfer station.

Description

Technical Field

[0001] The present invention relates to the field of garbage disposal, and more specifically, to a method and system for cascading garbage resource disposal based on garbage classification. Background Art

[0002] The amount of urban solid waste, mainly kitchen waste, generated by residents in their daily lives is increasing year by year. Moreover, they contain heavy metals, organic pollutants and other toxic components. Long-term storage or open-air burning has caused water, soil and air pollution, which has gradually become an important factor that endangers human health, affects ecological and environmental safety, and restricts the sustainable development of industries and regions. The contemporary choice of resource disposal solution is to solve environmental pollution, develop and utilize the biomass resources contained in it, realize resource transformation and realize the production of clean fuels.

[0003] Therefore, how to provide a comprehensive and systematic resource treatment solution for classified urban solid waste in accordance with local conditions and how to provide a deployment plan for the expansion or maintenance of recycling facilities and equipment in real time in stages under the growing demand for urban solid waste disposal are issues that need to be urgently addressed. Summary of the invention

[0004] The purpose of the present application is to provide a method and system for cascading resource disposal of garbage based on garbage classification. The present invention divides the solid garbage generated in the city into food waste, recyclable garbage and non-recyclable inorganic waste according to a predetermined garbage classification criterion, and adopts corresponding treatment technologies to treat the garbage according to the category of garbage, so that the resource efficiency of the garbage and the waste residue are both treated as resources. Furthermore, a multi-stage expansion strategy for recycling facilities and equipment is introduced to solve the growing demand for urban solid garbage disposal, and a capacity planning mathematical model is established. The minimum garbage disposal cost is used as the objective function of the capacity planning mathematical model. The capacity planning mathematical model covers the entire life cycle of the operation of the recycling facilities and equipment, and takes years as time slices. By predicting the annual growth trend of garbage, the capacity planning schemes of the biological treatment technology, material recovery technology and thermochemical treatment technology are calculated, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station. Therefore, under the growing demand for urban solid garbage disposal, a deployment scheme for expansion or maintaining the status quo is given in real time in stages. This deployment scheme is a relatively economical and environmentally friendly capacity planning deployment for the entire life cycle of the recycling facilities and equipment.

[0005] The above technical objectives of this application are achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a method for cascading waste resource disposal based on waste classification, the method comprising:

[0007] Based on the predetermined waste classification criteria, the solid waste generated in the city is divided into food waste, recyclable waste and non-recyclable inorganic waste;

[0008] The food waste is treated by biological treatment technology, and the amount of the first product converted from the food waste into biodiesel, electricity and biofertilizer is calculated according to the conversion rate of the waste components and the amount of waste contained in the treated food waste;

[0009] The recyclable waste is processed by material recovery technology, and the amount of the second product converted from the recyclable waste into the recycled product is calculated based on the conversion rate and amount of waste components contained in the processed recyclable waste;

[0010] The non-recyclable inorganic waste is treated with thermochemical treatment technology, and the amount of third products converted from the non-recyclable inorganic waste into electricity is calculated based on the low calorific value of the garbage components contained in the treated non-recyclable inorganic waste, the power generation efficiency and the amount of garbage;

[0011] Construct a capacity planning mathematical model with the minimum treatment cost as the goal under the operating constraints of garbage treatment; the minimum treatment cost refers to the minimum waste treatment cost of the garbage treatment plant and the garbage transfer station;

[0012] Solve the capacity planning mathematical model to obtain the capacity planning schemes for the biological treatment technology, material recovery technology, and thermochemical treatment technology, as well as the capacity planning scheme for the carrying capacity of the garbage transfer station.

[0013] In one implementation, the food waste is treated by biological treatment technology, and according to the conversion rate of the waste components and the amount of waste contained in the treated food waste, the calculation formula for calculating the amount of the first product corresponding to the biodiesel is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the diesel conversion rate of garbage component k, R represents the total number of treatment plants, M represents the total number of categories, K represents the total number of garbage components, and T represents the planning duration.

[0014] In one implementation, the food waste is treated by biological treatment technology. According to the conversion rate of waste components and the amount of waste contained in the treated food waste, the calculation formula for calculating the first product amount corresponding to the electricity is: in, Indicates the calorific value of methane combustion, MY k represents the methane production of garbage component k after anaerobic digestion, It represents the total amount of garbage classified as garbage component k in category m that is received by garbage treatment plant r at time t. R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0015] In one implementation, the food waste is treated by biological treatment technology, and according to the conversion rate of the waste components and the amount of waste contained in the treated food waste, the calculation formula for calculating the amount of the first product corresponding to the biofertilizer is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the fertilizer conversion rate of garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0016] In one implementation, the recyclable waste is processed by material recovery technology. According to the conversion rate of waste components and the amount of waste contained in the processed recyclable waste, the calculation formula for calculating the amount of the second product converted from the recyclable waste into the recycled product is:

[0017] in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the conversion rate of recycled products for garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0018] In one implementation, non-recyclable inorganic waste is treated with thermochemical treatment technology. According to the low calorific value of the garbage components contained in the treated non-recyclable inorganic waste, the power generation efficiency and the amount of garbage, the calculation formula for calculating the amount of the third product of electricity converted from the non-recyclable inorganic waste is:

[0019] Among them, LCV k Indicates the lower calorific value of garbage component k, EE r represents the power generation efficiency of the combustion turbine deployed in the waste treatment plant r, It represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t.

[0020] In one implementation, the mathematical expression of the capacity planning mathematical model constructed under the waste treatment operation constraint condition with the minimum treatment cost as the goal is: MinC = CC + OC-WI-EI; wherein CC represents the construction cost of the waste treatment plant and the waste transfer station, OC represents the operation cost of the waste treatment plant and the waste transfer station, WI represents the waste management income of the waste treatment plant and the waste transfer station, and EI represents the sales income of the energy products generated by the waste treatment plant in treating the waste;

[0021] in, Among them, CC j and CC r is the initial construction cost of garbage transfer station j and disposal plant r, ΔCC j and ΔCC r They are respectively represented as the expansion construction costs of these two nodes;

[0022] in, is the unit disposal cost of garbage component k classified as m at garbage transfer station j at time t, is the unit disposal cost of waste component k classified as m at waste treatment plant r at time t;

[0023] Among them, UW m represents the unit management cost of managing garbage category m;

[0024] EI=DP*price DP +EG*price EG +FP*price FP +RP*price RP , where Price* represents the recycling price of various energy products.

[0025] In one implementation, the garbage disposal operation constraints include:

[0026] The total amount of garbage classified as garbage component k in garbage category m received by the garbage transfer station at time t is equal to the total amount of garbage classified as garbage component k in garbage category m received by the garbage treatment plant at time t;

[0027] The amount of garbage received by the garbage transfer station and the garbage treatment plant at time t cannot exceed their respective maximum carrying capacity.

[0028] A second aspect of the present invention provides a system for cascading waste resource disposal based on waste classification, the system comprising:

[0029] A garbage classification module, for classifying the solid garbage generated in the city into food waste, recyclable garbage and non-recyclable inorganic waste based on a predetermined garbage classification criterion;

[0030] A biological treatment technology selection module is used to treat the food waste using biological treatment technology, and calculate the amount of the first product converted from the food waste into biodiesel, electricity and biofertilizer according to the conversion rate of the waste components and the amount of waste contained in the treated food waste;

[0031] A material recycling technology selection module is used to process recyclable waste using material recycling technology, and calculate the amount of second products converted from recyclable waste into recycled products based on the conversion rate and amount of waste components contained in the processed recyclable waste;

[0032] Thermochemical treatment technology selection module, used to treat non-recyclable inorganic wastes by using thermochemical treatment technology, and calculate the amount of third products converted from non-recyclable inorganic wastes into electricity according to the low calorific value of garbage components contained in the treated non-recyclable inorganic wastes, power generation efficiency and garbage volume;

[0033] The model building module is used to build a capacity planning mathematical model with the minimum processing cost as the goal under the operating constraints of garbage treatment; the minimum processing cost refers to the minimum common garbage treatment cost of the garbage treatment plant and the garbage transfer station;

[0034] The planning scheme determination module is used to solve the capacity planning mathematical model, obtain the capacity planning scheme of the biological treatment technology, material recovery technology and thermochemical treatment technology equipment, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] The present invention divides the solid waste generated in the city into food waste, recyclable waste and non-recyclable inorganic waste according to a predetermined waste classification criterion, and adopts corresponding treatment technologies to treat the waste according to the types of waste, so that the resource utilization efficiency of the waste and the waste residue are both treated as resources. Furthermore, a multi-stage expansion strategy for recycling facilities and equipment is introduced to solve the growing demand for urban solid waste disposal, and a capacity planning mathematical model is established. The minimum waste disposal cost is used as the objective function of the capacity planning mathematical model. The capacity planning mathematical model covers the entire life cycle of the operation of recycling facilities and equipment, and takes years as time slices. By predicting the annual growth trend of garbage, the capacity planning schemes of the biological treatment technology, material recovery technology and thermochemical treatment technology are calculated, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station. Therefore, under the growing demand for urban solid waste disposal, a deployment scheme for expansion or maintaining the status quo is given in real time in stages. The deployment scheme is a relatively economical and environmentally friendly capacity planning deployment for the entire life cycle of recycling facilities and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0038] Figure 1 A schematic flow chart of a method for cascading waste resource disposal based on waste classification provided by an embodiment of the present invention is shown;

[0039] Figure 2 A schematic diagram of the processing flow corresponding to three garbage processing technologies provided by an embodiment of the present invention is shown;

[0040] Figure 3 A schematic diagram showing a framework of treating kitchen waste using a biological treatment technology provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram showing a framework of treating non-recyclable inorganic waste using a thermochemical treatment technology provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of a framework for multi-stage expansion of disposal facilities and a garbage transfer station using three types of garbage disposal technologies provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of the function, operation or element applied for, and does not limit the increase of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of increasing one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0044] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0045] Please refer to Figure 1 , Figure 1 A flow chart of a method for cascading waste resource disposal based on waste classification provided by an embodiment of the present invention is shown, and the method includes:

[0046] S110, classifying the solid waste generated in the city into food waste, recyclable waste and non-recyclable inorganic waste based on a predetermined waste classification criterion.

[0047] In this embodiment, the garbage classification criteria can be found in the "Implementation Plan for the Domestic Garbage Classification System", which is a well-known technology in the field of garbage disposal technology and will not be explained in this embodiment. Figure 2 As shown, urban solid waste can include waste paper, waste glass, food waste, melon peels and nuts, old metals, flowers and plants, etc.

[0048] Accordingly, it is also a well-known technology for those skilled in the art to classify the solid waste generated in the city into food waste, recyclable waste and non-recyclable inorganic waste based on the waste classification criteria, so this embodiment will not be described in detail. The waste components contained in food waste, recyclable waste and non-recyclable inorganic waste will not be described in detail either.

[0049] S120, using biological treatment technology to treat the food waste, and calculating the first product amount of biodiesel, electricity and biofertilizer converted from the food waste according to the conversion rate of the waste components contained in the treated food waste and the amount of waste.

[0050] In this embodiment, biological treatment technology: landfill technology has low initial cost and convenient operation, but it will cause surface water, soil and air pollution; form land resource occupation and "garbage siege" phenomenon; there are safety hazards. Anaerobic digestion technology is relatively clean and will not cause additional environmental pollution. It can only process the solid part of kitchen waste, and the utilization rate is low, which can only reach 40-60% of the theoretical value.

[0051] For example, taking the food waste generated in cities as an example, Figure 3 As shown, food waste accounts for more than half of the city's solid waste, and it is introduced as a major item in this technical solution. Food waste is rich in organic matter and water, and needs to be disposed of through biological treatment technology (hereinafter referred to as a biological cascade system). First of all, based on the characteristics of high water and oil content in food waste, a solid-liquid separation and oil separation washing procedure is adopted (using a two-stage oil extraction process of "horizontal separation + dish separation") to ensure the quality of the oil. At the same time, compared with the domestic first-level oil extraction process, it has low energy consumption and can operate continuously and stably. At the same time, industrial crude oil (i.e. biodiesel) with an oil content of ≥97% can be obtained. Accordingly, biological treatment technology is used to treat food waste. According to the conversion rate of the garbage components contained in the treated food waste and the amount of garbage, the calculation formula for calculating the first product amount corresponding to biodiesel is: Among them, among them, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the diesel conversion rate of garbage component k, R represents the total number of treatment plants, M represents the total number of categories, K represents the total number of garbage components, and T represents the planning duration.

[0052] At the same time, solid matter produces clean electricity through anaerobic digestion and cogeneration process. Anaerobic fermentation adopts wet medium-temperature anaerobic fermentation. The organic substrate enters the biogas produced by the anaerobic fermentation system and is connected to the boiler for utilization. The cogeneration process is adopted to generate electricity and connect to the grid. Correspondingly, biological treatment technology is used to treat the food waste. According to the conversion rate of the garbage components contained in the treated food waste and the amount of garbage, the calculation formula for the first product amount corresponding to the electricity is: in, Indicates the calorific value of methane combustion, MY k represents the methane production of garbage component k after anaerobic digestion, It represents the total amount of garbage classified as garbage component k in category m that is received by garbage treatment plant r at time t. R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0053] Finally, the digested waste residue is centrifuged and dehydrated to obtain a biogas residue with a moisture content of 80% for external disposal, and then composted to generate biofertilizer. Correspondingly, the food waste is treated with biological treatment technology. According to the conversion rate and amount of waste components contained in the treated food waste, the calculation formula for the first product amount corresponding to the biofertilizer is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the fertilizer conversion rate of garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0054] S130, using material recovery technology to process recyclable waste, and calculating the amount of second product converted from the recyclable waste into recycled products based on the conversion rate of waste components and the amount of waste contained in the processed recyclable waste.

[0055] In this embodiment, physical recycling technology is used: the garbage sorting requirements are strict, and the facilities can only process a single type of waste. For example, a machine that produces recycled paper cannot complete the work of recycling plastics.

[0056] For those recyclable wastes such as waste paper, plastic, glass, etc. that are not contaminated and correctly classified and can be directly recycled, they are produced through recycling facilities to produce recycled paper, recycled plastics and recycled cloth, etc., and put back into the market. Taking recycled plastics as an example, this process needs to be handled separately according to the different types of plastics. First, the plastic waste collected from various sources is sorted by type (PET, HDPE, LDPE, etc.) and color. The sorted plastics are then chopped into small pieces or flakes and cleaned to remove impurities such as dust, labels and residues. The third step is melting and granulation, which requires the cleaned plastic flakes to be melted and made into small particles or other shapes. Finally, according to the requirements of the recycled products, the plastic particles are melted again, and then formed into new products through processes such as extrusion or injection molding. Some special products also need to go through processes such as cutting, welding or assembly. The calculation formula for calculating the amount of the second product converted from recyclable waste to recycled products is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the conversion rate of recycled products for garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration.

[0057] S140, using a thermochemical treatment technology to treat the non-recyclable inorganic waste, and calculating the amount of the third product of the non-recyclable inorganic waste converted into electricity based on the low calorific value of the garbage components contained in the treated non-recyclable inorganic waste, the power generation efficiency and the amount of garbage;

[0058] In this embodiment, thermal chemical treatment technology: Incineration technology has low starting requirements and low operating costs, but its process will produce toxic gases and inhalable particulate matter, and the thermal conversion efficiency is low. Pyrolysis technology can produce cleaner energy than simple incineration, but for urban solid waste with large daily output, it requires a large economic investment, so that the commercial scale of the technology is relatively small. Gasification technology: It is a clean and most efficient treatment solution, but it is still in its infancy worldwide due to its expensive one-time construction investment.

[0059] For non-recyclable inorganic waste, waste conversion is carried out through a thermochemical cascade treatment system, such as Figure 4 As shown, the system introduces pyrolysis and gasification technology to treat inorganic waste as a resource. The system consists of a circulating fluidized bed and an entrained bed riser, which can allow solid waste to undergo an incomplete combustion reaction in the gasifier. The process involves "cracking reaction", "oxidation reaction" and "reduction reaction", and ultimately generates synthetic fuel gas rich in high calorific value such as hydrogen and carbon monoxide, as well as coke. The combustible gas is then purified, dust removed, desulfurized, dechlorinated, etc., and sent to a combustion turbine for combustion to generate electricity. The formula for calculating the amount of the third product of non-recyclable inorganic waste converted into electricity is: Among them, LCV k Indicates the lower calorific value of garbage component k, EE r represents the power generation efficiency of the combustion turbine deployed in the waste treatment plant r, It represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t.

[0060] From the three waste treatment technologies corresponding to steps S120-S140 above, the complexity of the composition of urban solid waste means that no technology can perfectly dispose of it in an efficient and clean resource manner. Inspired by the concept of cascade treatment, the complementarity of different treatment principles can complement each other, that is, the shortcomings of one technology can be compensated by the advantages of another technology. Therefore, the embodiment of the present application reasonably designs the carrying capacity of the selected technology from the perspective of technology, economy, environment and social benefits, and balances the carrying capacity of the increasing urban solid waste and the rationality of investment design.

[0061] Therefore, the present invention realizes a comprehensive and systematic resource processing solution and provides a deployment solution for the expansion or maintenance of the recycling facilities and equipment in stages in real time under the growing demand for urban solid waste disposal through a two-step technical solution. The above steps S110-140 are the first stage provided by the embodiment of the present application, which provides a technical selection solution for the resource operation of urban solid waste from collection to disposal. The specific problems mainly solved in this part are: breaking through the limitations of single waste disposal technologies such as traditional anaerobic digestion, landfill and incineration, giving play to the resource potential of each garbage component under each category of garbage, and improving the power generation efficiency of various types of urban solid waste, so as to achieve the municipal management goals of zero waste residue and clean production.

[0062] In the first stage, users can flexibly formulate their resource disposal plans. Not only the advanced and clean resource recovery technologies in waste disposal are combined, but also the characteristics of various types of waste components in the application area are taken into account through mathematical examples, so as to obtain the output of resource products in each disposal flow. In the process of weighing and optimizing the benefits of multiple products and input costs, a reasonable cascade disposal plan for solid waste resource recovery is given for each city.

[0063] S150, constructing a capacity planning mathematical model with minimum processing cost as the goal under the waste treatment operation constraint conditions; wherein the minimum processing cost refers to the minimum waste treatment cost of the waste treatment plant and the waste transfer station.

[0064] In this embodiment, if Figure 5 As shown, once the garbage disposal facilities and equipment are deployed, they will be put into operation for 15 to 20 years. Therefore, affected by the uncertain growth rate of urban solid waste, the reasonable selection of the load-bearing capacity of the facilities is an important measure of the success of technical deployment. Therefore, this embodiment introduces a multi-stage expansion strategy as the second stage of work. The working years are manually divided in the planning stage, and during the 5-10 years of operation, the expansion strategy is selected according to the current status of garbage growth. This avoids the negative impact of the uncertainty of garbage growth and inaccurate trend predictions on the strategic deployment of garbage resources, and reduces the difficulty of designing the processing capacity of each facility in the early decision-making stage in traditional planning. It allows users to not only leave a margin for garbage growth for a long period of time in the future at the early stage of planning, but also avoid excessive deployment and waste of funds.

[0065] The established capacity planning mathematical model takes the minimization of waste treatment costs as the program goal. The model covers the entire life cycle of waste treatment facilities, takes years as time slices, and predicts the annual growth trend of waste. It guides decision makers to design the capacity of three sets of cascade treatment facilities and the carrying capacity of transfer stations with a five-year cycle (later, whether to decide on capacity expansion).

[0066] The mathematical expression of the capacity planning mathematical model is: MinC = CC + OC-WI-EI; where CC represents the construction cost of the waste treatment plant and the waste transfer station, OC represents the operating cost of the waste treatment plant and the waste transfer station, WI represents the waste management income of the waste treatment plant and the waste transfer station, and EI represents the sales income of the energy products generated by the waste treatment plant.

[0067] in, Among them, CC j and CC r is the initial construction cost of garbage transfer station j and disposal plant r, ΔCC j and ΔCC r They are respectively represented as the expansion construction costs of these two nodes;

[0068] in, is the unit disposal cost of garbage component k classified as m at garbage transfer station j at time t, is the unit disposal cost of waste component k classified as m at waste treatment plant r at time t;

[0069] Among them, UW m represents the unit management cost of managing garbage category m;

[0070] EI=DP*price DP +EG*price EG +FP*price FP +RP*price RP , where Price* represents the recycling price of various energy products.

[0071] Secondly, in one embodiment, the waste treatment operation constraint condition includes: the total amount of waste classified as waste component k in waste category m received by the waste transfer station at time t is equal to the total amount of waste classified as waste component k in waste category m received by the waste treatment plant at time t;

[0072] The amount of garbage received by the garbage transfer station and the garbage treatment plant at time t cannot exceed their respective maximum carrying capacity.

[0073] Specifically, to ensure the normal operation of the system, some objective constraints are taken into consideration.

[0074] Material flow balance between garbage transfer station and garbage treatment plant: Urban solid waste sent to garbage transfer station is sorted for the second time and sent to the corresponding disposal site. The mathematical expression is: in: It represents the total amount of garbage classified as garbage component k among m categories of garbage received by the garbage transfer station at time t.

[0075] The respective disposal capacity constraints of the garbage transfer station and the garbage treatment plant: In each time period t, the garbage disposal volume of the garbage transfer station and the garbage treatment plant cannot exceed the maximum disposal volume they can carry. The mathematical expression is:

[0076]

[0077] In general, capacity expansion will inevitably lead to an increase in fixed investment, as well as more employment opportunities and more objective disposal capacity. Therefore, this plan can enable the deployment of various waste treatment technology facilities and equipment at the waste treatment plant within a reasonable carrying capacity, thereby optimizing the collection, transportation and multi-cascade system treatment of urban solid waste, and further minimizing the waste treatment costs of waste treatment plants and waste transfer stations.

[0078] S160, solve the capacity planning mathematical model to obtain the capacity planning scheme of the equipment of biological treatment technology, material recovery technology and thermochemical treatment technology, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station.

[0079] In this embodiment, for the solution process, since the capacity planning mathematical model provided above establishes a linear programming model for minimizing processing costs, it can be compiled and solved by software such as Lingo and Matlab. These mathematical methods for solving the capacity planning mathematical model are well-known technologies for those skilled in the art, and no unnecessary description is given in this embodiment.

[0080] In summary, the embodiments described above provide a method for cascading resource disposal of garbage based on garbage classification. The solid garbage generated in the city is divided into food waste, recyclable garbage and non-recyclable inorganic waste according to a predetermined garbage classification criterion. According to the types of garbage, corresponding treatment technologies are used to treat the garbage, so that the resource efficiency of the garbage and the waste residue are both treated as resources. Furthermore, a multi-stage expansion strategy for recycling facilities and equipment is introduced to solve the growing demand for urban solid waste disposal, and a capacity planning mathematical model is established. The minimum garbage disposal cost is used as the objective function of the capacity planning mathematical model. The capacity planning mathematical model covers the entire life cycle of the operation of the recycling facilities and equipment, and takes years as time slices. By predicting the annual growth trend of garbage, the capacity planning schemes of the biological treatment technology, material recovery technology and thermochemical treatment technology are calculated, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station. Therefore, under the growing demand for urban solid waste disposal, a deployment plan for expansion or maintaining the status quo is given in real time in stages. This deployment plan is a relatively economical and environmentally friendly capacity planning deployment for the entire life cycle of the recycling facilities and equipment.

[0081] In the embodiment of the present application, a system for cascading waste resource disposal based on waste classification is also provided. Figure 1 The method of cascading resource disposal of garbage based on garbage classification shown is an invention based on the same concept. Through the above detailed description of the method of cascading resource disposal of garbage based on garbage classification, those skilled in the art can clearly understand the implementation process of the system of cascading resource disposal of garbage based on garbage classification in this embodiment. Therefore, for the sake of conciseness of the specification, it will not be repeated here.

[0082] This embodiment provides a system for cascading waste resource disposal based on waste classification, and the system includes:

[0083] A garbage classification module, for classifying the solid garbage generated in the city into food waste, recyclable garbage and non-recyclable inorganic waste based on a predetermined garbage classification criterion;

[0084] A biological treatment technology selection module is used to treat the food waste using biological treatment technology, and calculate the amount of the first product converted from the food waste into biodiesel, electricity and biofertilizer according to the conversion rate of the waste components and the amount of waste contained in the treated food waste;

[0085] A material recycling technology selection module is used to process recyclable waste using material recycling technology, and calculate the amount of second products converted from recyclable waste into recycled products based on the conversion rate and amount of waste components contained in the processed recyclable waste;

[0086] Thermochemical treatment technology selection module, used to treat non-recyclable inorganic wastes by using thermochemical treatment technology, and calculate the amount of third products converted from non-recyclable inorganic wastes into electricity according to the low calorific value of garbage components contained in the treated non-recyclable inorganic wastes, power generation efficiency and garbage volume;

[0087] The model building module is used to build a capacity planning mathematical model with the minimum processing cost as the goal under the operating constraints of garbage treatment; the minimum processing cost refers to the minimum common garbage treatment cost of the garbage treatment plant and the garbage transfer station;

[0088] The planning scheme determination module is used to solve the capacity planning mathematical model, obtain the capacity planning scheme of the biological treatment technology, material recovery technology and thermochemical treatment technology equipment, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station.

[0089] Accordingly, the embodiment of the present application provides a system for cascade resource disposal of garbage based on garbage classification, which divides the solid garbage generated in the city into food waste, recyclable garbage and non-recyclable inorganic waste according to predetermined garbage classification criteria, and adopts corresponding treatment technologies to treat the garbage according to the types of garbage, so that the resource utilization efficiency of the garbage and the waste residue are both treated as resources. Furthermore, a multi-stage expansion strategy for recycling facilities and equipment is introduced to solve the growing demand for urban solid waste disposal, and a capacity planning mathematical model is established. The minimum garbage disposal cost is used as the objective function of the capacity planning mathematical model. The capacity planning mathematical model covers the entire life cycle of the operation of recycling facilities and equipment, and takes years as time slices. By predicting the annual growth trend of garbage, the capacity planning schemes of the biological treatment technology, material recovery technology and thermochemical treatment technology are calculated, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station. Therefore, under the growing demand for urban solid waste disposal, a deployment plan for expansion or maintaining the status quo is given in real time in stages. This deployment plan is a relatively economical and environmentally friendly full-life cycle capacity planning deployment for recycling facilities and equipment.

[0090] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for cascading waste resource disposal based on waste classification, characterized in that: Methods include: Based on the predetermined waste classification criteria, the solid waste generated in the city is divided into food waste, recyclable waste and non-recyclable inorganic waste; The food waste is treated by biological treatment technology, and the first product amount of biodiesel, electricity and biofertilizer converted from the food waste is calculated according to the conversion rate of the waste components and the amount of waste contained in the treated food waste; wherein the calculation formula for calculating the first product amount corresponding to biodiesel is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the diesel conversion rate of garbage component k, R represents the total number of treatment plants, M represents the total number of categories, K represents the total number of garbage components, and T represents the planning duration; the calculation formula for calculating the first product quantity corresponding to electricity is: in, Indicates the calorific value of methane combustion, MY k represents the methane production of garbage component k after anaerobic digestion, It represents the total amount of garbage classified as garbage component k in garbage of category m received by garbage treatment plant r at time t, R represents the total number of garbage treatment plants, M represents the total category of garbage components, K represents the total amount of garbage components, and T represents the planning duration; the calculation formula for calculating the first product amount corresponding to biofertilizer is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the fertilizer conversion rate of garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration; The recyclable waste is processed by material recovery technology, and the amount of the second product converted from the recyclable waste into the recycled product is calculated according to the conversion rate of the waste components and the amount of waste contained in the processed recyclable waste; wherein the calculation formula for calculating the amount of the second product converted from the recyclable waste into the recycled product is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the conversion rate of recycled products for waste component k, R represents the total number of waste treatment plants, M represents the total categories of waste components, K represents the total number of waste components, and T represents the planning duration; The non-recyclable inorganic waste is treated with thermochemical treatment technology. According to the low calorific value of the garbage components contained in the treated non-recyclable inorganic waste, the power generation efficiency and the amount of garbage, the amount of the third product of the non-recyclable inorganic waste converted into electricity is calculated; wherein, the calculation formula for calculating the amount of the third product of the non-recyclable inorganic waste converted into electricity is: Among them, LCV k Indicates the lower calorific value of garbage component k, EE r represents the power generation efficiency of the combustion turbine deployed in the waste treatment plant r, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t; A capacity planning mathematical model is constructed with the minimum processing cost as the goal under the operating constraints of garbage treatment; the minimum processing cost refers to the minimum common garbage treatment cost of the garbage treatment plant and the garbage transfer station; the mathematical expression of the capacity planning mathematical model is: MinC = CC + OC-WI-EI; CC represents the construction cost of the garbage treatment plant and the garbage transfer station, OC represents the operating cost of the garbage treatment plant and the garbage transfer station, WI represents the garbage management income of the garbage treatment plant and the garbage transfer station, and EI represents the sales income of the energy products generated by the garbage treatment plant; in, Among them, CC j and CC r is the initial construction cost of garbage transfer station j and disposal plant r, ΔCC j and ΔCC r They are respectively represented as the expansion construction costs of these two nodes; in, is the unit disposal cost of garbage component k classified as m at garbage transfer station j at time t, is the unit disposal cost of waste component k classified as m at waste treatment plant r at time t; Among them, UW m represents the unit management cost of managing garbage category m; EI=DP*price DP +EG*price EG +FP*price FP +RP*price RP , where Price* represents the recycling price of various energy products; The operating constraints of garbage treatment include: the total amount of garbage classified as garbage component k in garbage category m received by the garbage transfer station at time t is equal to the total amount of garbage classified as garbage component k in garbage category m received by the garbage treatment plant at time t; the amount of garbage received by the garbage transfer station and the garbage treatment plant at time t cannot exceed their respective maximum carrying capacity; Solve the capacity planning mathematical model to obtain the capacity planning schemes for the biological treatment technology, material recovery technology, and thermochemical treatment technology, as well as the capacity planning scheme for the carrying capacity of the garbage transfer station.

2. A system for cascading waste resource disposal based on waste classification, characterized in that: The system includes: A garbage classification module, for classifying the solid garbage generated in the city into food waste, recyclable garbage and non-recyclable inorganic waste based on a predetermined garbage classification criterion; The biological treatment technology selection module is used to treat the food waste using biological treatment technology, and calculate the first product amount of biodiesel, electricity and biofertilizer converted from the food waste according to the conversion rate and amount of waste components contained in the treated food waste; wherein the calculation formula for calculating the first product amount corresponding to biodiesel is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the diesel conversion rate of garbage component k, R represents the total number of treatment plants, M represents the total number of categories, K represents the total number of garbage components, and T represents the planning duration; the calculation formula for calculating the first product quantity corresponding to electricity is: in, Indicates the calorific value of methane combustion, MY k represents the methane production of garbage component k after anaerobic digestion, It represents the total amount of garbage classified as garbage component k in garbage of category m received by garbage treatment plant r at time t, R represents the total number of garbage treatment plants, M represents the total category of garbage components, K represents the total amount of garbage components, and T represents the planning duration; the calculation formula for calculating the first product amount corresponding to biofertilizer is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the fertilizer conversion rate of garbage component k, R represents the total number of garbage treatment plants, M represents the total categories of garbage components, K represents the total number of garbage components, and T represents the planning duration; The material recycling technology selection module is used to process recyclable waste using material recycling technology, and calculate the amount of the second product converted from the recyclable waste into recycled products according to the conversion rate of the waste components and the amount of waste contained in the processed recyclable waste; wherein the calculation formula for calculating the amount of the second product converted from the recyclable waste into recycled products is: in, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t, represents the conversion rate of recycled products for waste component k, R represents the total number of waste treatment plants, M represents the total categories of waste components, K represents the total number of waste components, and T represents the planning duration; Thermochemical treatment technology selection module is used to treat non-recyclable inorganic waste using thermochemical treatment technology, and calculate the amount of third products of electricity converted from non-recyclable inorganic waste according to the low calorific value of garbage components contained in the treated non-recyclable inorganic waste, power generation efficiency and garbage amount; wherein, the calculation formula for calculating the amount of third products of electricity converted from non-recyclable inorganic waste is: Among them, LCV k Indicates the lower calorific value of garbage component k, EE r represents the power generation efficiency of the combustion turbine deployed in the waste treatment plant r, represents the total amount of garbage classified as garbage component k in category m received by garbage treatment plant r at time t; The model building module is used to build a capacity planning mathematical model with the minimum processing cost as the goal under the constraints of garbage treatment operation; the minimum processing cost refers to the minimum common garbage treatment cost of the garbage treatment plant and the garbage transfer station; the mathematical expression of the capacity planning mathematical model is: MinC = CC + OC-WI-EI; CC represents the construction cost of the garbage treatment plant and the garbage transfer station, OC represents the operating cost of the garbage treatment plant and the garbage transfer station, WI represents the garbage management income of the garbage treatment plant and the garbage transfer station, and EI represents the sales income of the energy products generated by the garbage treatment plant; in, Among them, CC j and CC r is the initial construction cost of garbage transfer station j and disposal plant r, ΔCC j and ΔCC r They are respectively represented as the expansion construction costs of these two nodes; in, is the unit disposal cost of garbage component k classified as m at garbage transfer station j at time t, is the unit disposal cost of waste component k classified as m at waste treatment plant r at time t; Among them, UW m represents the unit management cost of managing garbage category m; EI=DP*price DP +EG*price EG +FP*price FP +RP*price RP , where Price* represents the recycling price of various energy products; The operating constraints of garbage treatment include: the total amount of garbage classified as garbage component k in garbage category m received by the garbage transfer station at time t is equal to the total amount of garbage classified as garbage component k in garbage category m received by the garbage treatment plant at time t; the amount of garbage received by the garbage transfer station and the garbage treatment plant at time t cannot exceed their respective maximum carrying capacity; The planning scheme determination module is used to solve the capacity planning mathematical model, obtain the capacity planning scheme of the biological treatment technology, material recovery technology and thermochemical treatment technology equipment, as well as the capacity planning scheme of the carrying capacity of the garbage transfer station.

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