張慶源2006-07-262018-06-282006-07-262018-06-282002-07-31http://ntur.lib.ntu.edu.tw//handle/246246/22099The human economic development may trigger the deterioration of environmental quality. To prevent the situation from becoming worse, the environmental protection and resource recycling must be conducted thoroughly. However, the economic growth should also be deliberated simultaneously. Thus they influence each other. Therefore, the optimistic way is to consider the combination of environmental protection and economic growth in order to pursue the sustainable development. This concept has cultivated the introduction and application of industrial ecology (IE). It includes the material flow, energy flow, and capital flow systems. This study was focused on the material flows of steel and iron for Taiwan’s steel industry. In the first part of the study, the IE model presented by Graedel and Allenby [1] for the other industries was applied to assess the circumstance in Taiwan. Also, in the second part of the present analysis, two recognized indicators, the per capita of use (PCU, defined as production/population in this study) and intensity of use (IU, defined as production/GDP in the present analysis) were used to compare the situation in Taiwan with those in the U.S.A. and Japan. Six approaches were postulated to describe the IE scenario of the material flows of steel and iron for the steel industry in Taiwan with five nodes. These included : 1) Approaches 3 and 4 concerning the individual stream of the steel materials uncollected, discarded, or left in the environment (denoted as Munj) and change of inventory (denoted as dImj/dt) for each node j with j = 1 to 5, 2) Approaches 1 and 5 taking into account the individual Munj but lumped dΣImj/dt, and 3) Approaches 2 and 6 with the consideration of both lumped ΣMunj and dΣImj/dt. IE model with the lumped computations ofΣMunj and dΣ Imj/dt for all nodes in the IE model reasonably revealed the material flows of steel and iron for Taiwan’s steel industry. The average values of the PCUs of the three noted countries are in order of Japan > Taiwan > U.S.A. However, Japan showed a slightly downward trend in terms of the yearly variation of PCUs, while Taiwan upward. The results indicate that the demand of steel and iron in Taiwan have remained higher in supporting its development in the recent years. The IUs of steel and iron for the steel industries of the U.S.A. and Japan are lower than that of Taiwan, revealing the better uses of steel and iron by the U.S.A. and Japan to contribute to the GDP. The results of PCUs and IUs also demonstrate that there still has room to improve for the better usage of steel and iron in the steel industry and thus the quality of the environment in Taiwan.application/pdf444142 bytesapplication/pdfzh-TW國立臺灣大學環境工程學研究所Industrial ecologymaterial flowsteel industryper capita of useintensity of use[SDGs]SDG8reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/22099/1/902621Z002025.pdf