Waste Recycling System Material Metabolism Analysis Model And Its Application

Material flows and cycles are important form of expression about social metabolism processes, which are also important forms of communication between the natural ecosystem and social economic system of human beings. Since the industrialization and urbanization processes accompanied with resource excessive consumption and environmental pollution emissions broke the harmonious development and dynamic equilibrium between the natural ecosystem and social economic system of human beings, large ecological rucksacks have been formed on the natural ecosystem. From the perspective of sustainable development, waste is being treated as an alternative of nature resource by human beings. In this opinion, it is important to study the waste metabolism modes of China to solve resource shortage and environmental pollution problems.Based on the theory of Material Metabolism and Industrial Ecology, this thesis analysis the characteristics of waste recycling system of China and extends conventional frameworks of material flow analysis and input-output analysis to establish new frameworks of waste flow analysis and waste metabolism input-output analysis. With these two important modules, this thesis establishes the Waste Recycling System Material Metabolism Analysis (WRSMM) model to study the waste metabolism processes through the waste recycling system of China by an integration of macro-econometric forecast model, scenario analysis method, life cycle assessment method, cost benefit anlysis method, emergy analysis method and sensitivity analysis method. An integrated assessment of waste metabolism mode of waste recycling system of China is developed as a basic study, with 2005 as the base year. Then the possible evolution patterns of waste recycling system of China are simulated. Meanwhile, this study also discusses the pathway choice of waste recycling system, using crop resiudes as a case.The results of analyse of status quo analysis present that the low-level resource productivity and cyclical use rate problems still exist in the waste recycling system of China. The adjustment of industrial structure and product mix and the technological advances have effects on the mode of waste metabolism, while the development of waste reduction technologies affects the mode most availably.The result of pathway choice study present that it is the policy targets which determine the pathway of waste flows planned by decision makers. A summary of the possible aspects of waste management targets in different countries includes the environmental pollution elimination benefit, economic benefit, global warming potential elimination benefit and energy substitution benefit. Under multi-objective combination scenarios, the pathways of waste flows will change according to the policy targets, but in this process, the infection of the market mechanism should be also considered.