Abstract
Recently, Life Cycle assessment has been applied to environmental impact evaluation for industrial products. Environmental Impact Assessment (EIA) methods have been applied for the environmental impact evaluation of plans of infrastructures. However, the EIA methods are limited to the regional environment, whereas LCA can deal with broader range of environmental issues like the global environmental problems. Application of LCA to civil engineering fields is effective in this reason.The purpose of this study is the environmental impact evaluation of waste water treatment by Life Cycle Assessment. At first we've prepared many kinds of unit environmental loads of materials, machines, and energies consumed in life cycle time by input-output analysis method using 1990 Input-Output Tables of Japan and these values of unit loads include the direct and indirect loads. Using the result of life cycle inventory analysis of waste water treatment, we caluculated environmental loads from biochemical and chemical unit processes and attempted to evaluate the three types of high advanced COD treatment.
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