Material Recycling Within And Among Enterprises

The material recycling within and among enterprises was studied in the light of industrial ecology, ecology and system engineering. The influence of material recycling on resource and environmental indicators was explored. The results of the study were applied to steel enterprise and Eco-Industrial Park (EIP). A set of new methods and ideas is presented for saving resources and improving environment in enterprises and region. The main contents are as follows:1. A standard element flow diagram of a manufacturing process was launched. The influence of element flow deviated in various ways from standard element flow diagram on the element resource efficiency was analyzed. The relationship between element resource efficiency of a manufacturing process and that of its unit processes was given. Similarly, the relationship between element environment efficiency of a manufacturing process and that of its unit processes was also given. In addition, the relationship between element resource efficiency and element environment efficiency of a manufacturing process was given too. The results of the study lay the foundations for analyzing the influence of element flow on resource and environmental indicators in all kinds of manufacturing processes.2. By using the data of a steel plant, the influence of iron flow in the steel manufacturing process on its iron resource efficiency was analyzed as an example. The influence of iron resource efficiency of unit process on that of its manufacturing process was analyzed. Similarly, The influence of iron environment efficiency of unit process on that of its manufacturing process was also analyzed. The relationship among iron resources efficiency, iron environment efficiency and steel scrap index in a steel manufacturing process was raveled. The iron resource efficiencies of the BF-BOF, EAF and mixed manufacturing process were discussed. And the influence of the EAF/steel ratio on iron resource efficiency in the mixed manufacturing process was also discussed. Meanwhile, the relationship between iron resources efficiency and the EAF/steel ratio of steel industry in China, USA and Japan was discussed.3. The method and step of industrial metabolism analysis for an element in an enterprise were given on the basis of industrial metabolism. The industrial metabolism...