| Industry is the connector of converting local resources, and the domain of energy metabolism and pollutant discharges. Circular economy as a solution to solve the environmental issues becomes a key topic in the world. With weak industry, fragile ecological environment, and sensitive relationship between human and the earth, the traditional industrial development model has posed threats to oasis ecology. Emulating symbiosis to build circular economy is a key to breaking through the bottleneck of economic development and resource constraints. Shihezi is located in Manas river watershed, which belongs to the economic belt on the northern slope of Tianshan mountains. It is selected as a pilot region of the nation and the autonomy district. Systematic research on the application of industrial circular economy in arid lands will not only serve as a model for the economic belt on the northern slope of Tianshan mountains, Xinjiang District, and western arid lands, but also provide theoretical and practical guidance for exploring low-carbon mode and realizing leapfrogging development in arid lands.The main research topics and conclusions of this dissertation are the following:The dissertation reviews the literature of circular economy in China and overseas. Based on the theories and technologies of industrial circular economy in arid lands, it tentatively employs the environmentology and environmental economics to analyze the mechanism and expands the theoretical foundation of circular economy.Using Xinjiang as an example, this dissertation analyzes the existing and upcoming issues of developing industrial circular economy in arid lands. The goals, principles, approaches, and models for developing circular economy of industry are explored combined with "reduce, reuse, recycle" principles. The goal is to optimize the economic, environmental, ecological, and social benefits and realize the balance of economic development and environmental conservation. The principles include reducing, recycling, and prioritizing oasis preservation. The approach adopted is "one synthesis, two recycles, two systems". The models consist of micro cycle in plants, intermediate cycle in ecological industry park, and macro cycle in oasis region.It summarizes the achievements of industrial circular economy developments in Shihezi, and qualitatively analyzes the industrial chain and inner connections based on the orientation in functional regions plans of the country and Xinjiang municipality. The author further applies graph theory, complexity science, and network theory to quantitatively analyze the complexity of industrial symbiosis network in Shihezi. The results show that the industrial symbiosis network in Shehezi is complex, small-world, and scale-free, similar to neural networks, bacterial metabolism networks, and ecological-chain networks.Based on the survey data in 2009, the dissertation discusses the integration of materials, water, and energy in clean production at region and enterprise (Tianye Co, Ltd) levels and further qualitatively analyzes the implementation capabilities of industrial circular economy at enterprise and government levels.The multi-objective fuzzy optimization model of industrial symbiosis networks is established by fuzzy mathematics and operational research. In this model, the goal function is maximum of synthetical benefits of economy, society, resources & environment, and nonlinear relative membership degrees is the weighted coefficients of outputs. Taking 400 thousand t/a PVC project as an example, the dissertation quantitatively analyzes the optimization of industrial symbiosis in Shihezi. The research finds that every manufacturing plant realizes the target of industrial symbiosis basically, while there is still room for cutting water, energy use and pollution in calcium carbide plant. The model is proven to be precise, reasonable, and practical for sustainable development of industry in arid lands.Based on the principles of "think local, act local", scientific, objective, dynamic, comparable, and practical, the author constructs Shihezi industrial circular economy measurement indicator system(SICEMIS), determines the weights of indicators using dispersion weight methods and Delphi weight methods, proposes the hierarchy levels of indicators, and the simple linear weighting as evaluation methods. The results show that Shihezi industrial circular economy development index is improved from 0.27 to 0.70 between 2002 and 2008, and the cycle degree tends to upper level. It is owing to the pilot actions of Tianye Co, Ltd and driving of government mainly. Countermeasures are put forward to solve the existing issues of developing industrial circular economy in Shihezi one by one.The dissertation summarizes the enlightenment to developing industrial circular economy from the case, points out the key function of optimizing water use in circular economy, and emphasizes the importance of technology innovation in integrating industries. Industrial circular economy in arid lands is in essence circular economy in basin and oasis. Compared to non arid areas, industrial circular economy in arid lands confronts more challenges and constraints, with the unique limiting factors and boundary conditions in development models and prioritization of oasis development. "one synthesis, two recycles, two systems" is key for developing industrial circular economy in arid lands. Among them, "one synthesis" is the premise, "two recycles" facilitates the organic integration of ecological-friendly industry and industrialization of pollution mitigation, and "two systems" is the mechanism of safeguarding sustainable development of industrial circular economy.
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