SD Simulation Study On The Whole Process MSW Management In High-cold And High-altitude Area

The Qinghai-Tibet Plateau belongs to the high-cold and high-altitude area,which is an important component of China’s "two screens and three zones" ecological security pattern,and plays an extremely crucial position in China’s ecological construction and protection.The scientific treatment and disposal of solid waste,especially the comprehensive and effective management of the whole process of municipal solid waste(MSW),has a significant impact on the construction and protection of regional ecological environment in high-cold and high-altitude area.However,the whole process of MSW management in high-cold and high-altitude area of China has some problems such as low resource utilization rate,low harmless treatment rate and high cost and so on.Therefore,this thesis takes the comprehensive disposal and utilization management system of MSW in Lhasa as the research object and carries out research work in the following aspects:1.This thesis has a comprehensive analysis of the status quo and existing problems of the whole process MSW management in Lhasa by means of on-site investigation and network investigation.According to the obtained data,problems and characteristics of the whole process of MSW generation,classification,transportation,treatment and resource utilization in high-cold and high-altitude area are determined.2.Based on the results of investigation and analysis,system engineering theory and system dynamics method,the system dynamics model of comprehensive disposal and utilization of MSW in Lhasa is constructed by using Vensim software.The model involves four subsystems,including economy,population,MSW generation and classification,MSW treatment and resource utilization.117 mathematical relations and162 system variables are used to describe the interaction mechanism between variables of each subsystem and variable-subsystem-whole system.Reasonably and effectively reflect the whole process management of MSW generation,transportation,treatment and disposal,and resource utilization in high-cold and high-altitude area.3.Combined with the actual situation changes,the scenario settings are provided and simulation analysis is conducted.Carry out system simulation and analysis for the government planning development mode,optimized development mode,strengthening MSW classification scenario,classified treatment of MSW scenario and waste charging scenario,and explore the main factors and results that affect the reduction,harmless treatment rate,resource utilization rate,treatment effect and management cost of MSW in Lhasa.It provides theoretical support and coping strategies for optimizing the whole process management of MSW in Lhasa and carrying out construction of various MSW treatment facilities.4.Put forward scientific and reasonable policies,measures and suggestions for the whole process management of MSW in Lhasa,including waste reduction and classification,reasonable disposal facilities investment,urban and rural MSW treatment mode selection.It is of great significance to promote the sustainable and coordinated development of ecological environment,economy and society in the high-cold and high-altitude area,especially on the Qinghai-Tibet Plateau,and to promote the construction of ecological civilization on the Qinghai-Tibet Plateau and the building of a beautiful China.