DEVEROPMENT OF LIFE CYCLE ASSESSMENT METHOD FOR EVALUATION OF LOCAL ENVIRONMENT

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Life cycle assessment (LCA) is a useful analytical method evaluating for environmental impacts of a particular product, including raw materials acquisition, manufacturing I processing I formulation, distribution I transportation, use I reuse/maintenance, recycle and waste management. Environmental loads in the recycling stage and waste management stage, however, has not been quantified in previous researches. In this study, the environmental loads were qualified and quantified and LCA of some products were performed.First, environmental loads of municipal solid waste disposal is quantified based on CO_2 (carbon dioxide) emission. The scenario of waste disposal consists of reducing of waste generation, recycling of beverage containers and energy recovery from refuse derived fuels. The CO_2 emission of each disposal methods showed large difference. At the same time, necessity of material flow analysis including secondary products, which are not considered as waste, is clarified.Next, mat … More erial flow of iron industry was researched and environmental loads in the recycling stage were quantified. The reason why we focused on the industry is that it is easy to get data and information about recycling, because they had been established a recycling system. As the results, storage quantity in the society and a term the material will be recycled played an important role.Finally, LCA analysis of 6 kinds of beverage container (PET bottle, returnable glass bottle, nonreturnable glass bottle, aluminum can, steel can, paper carton) including accessories (a cap and coating materials) were performed. In the analysis, reuse, closed-loop recycling and open-loop recycling were considered in each scenarios. As the results, environmental loads of accessories were not negligible, although previous studies have not refer to them. However, the direct comparison of environmental loads of each beverage containers was impossible, because we had to use different data for each products as useful information was limited. Less