Economic And Environmental Study Of Household Waste Separation Collection And Transportation System Based On System Dynamics

With the development of waste source separation system,municipal household waste has gradually changed from the mixed collection and transportation and simple treatment management mode to the whole classification management of sorting,collection,transportation,and treatment.The drop-off,collection-transportation,and end-disposal processes are more standardized and refined,with higher requirements for facilities and equipment,greater transportation needs,and more personnel input,leading to increased greenhouse gas emissions and capital consumption in the collection and transportation system.Therefore,the issue of economic and environmental optimization of municipal household waste collection and transportation system management needs to be solved.This paper first analyzed the operational characteristics of the household waste sorting collection and transportation system,divided it into the waste generation subsystem,the collection and transportation subsystem,and the disposal subsystem,based on analyzing the feedback relationship between the relevant elements of each subsystem,then constructed the system dynamics flow diagram of the economic and environmental impact of the collection and transportation system by using Anylogic software.Further,the statistical regression of SPSS was used to establish the functional equations between the subsystem variables,assigned values to the parameters,and verified the feasibility and validity of the model;By setting up scenarios with different percentages of food waste and residual waste,the economic and environmental changes are analyzed;finally,the important factors which affect the economy and environment of the collection and transportation system were extracted from each process by using sensitivity analysis,and the range of uncertainty fluctuation of total cost and total greenhouse gas emission of the system was simulated by using Monte Carlo.The results show that an increase in the proportion of food waste in the collection and transportation system is positively related to the total cost of the system and negatively related to the total greenhouse gas emissions of the system.Factors such as waste disposal costs,waste charges,residual waste disposal costs and diesel fuel prices have significant impacts on the total costs of the system;factors such as greenhouse gas emissions from residual waste disposal,daily residual waste volume,daily food waste volume and daily recyclables volume contribute significantly to the total greenhouse gas emissions of the system.This model can provide theoretical support to governmental waste management departments and enterprises to improve the economic efficiency and environmental improvement of the whole collection and transportation system.