Abstract
The purpose of this study is to investigate the life-cycle environmental assessment of urban sewage systems. LCE (life-cycle energy) is chosen as an indicator, and energy input to construction and maintenance of water treatment plants and drainage networks is estimated. Energy required for the production of input materials, machines and equipments, and for the construction of buildings is calculated based on a standard method of input-output analysis. Direct energy input to construction works and plant operation is estimated by using the standard construction work budget estimation manual of the Ministry of Construction and the actual plant operation data for the sewers in Fukuoka City. Although the calculation does not cover the entire life-cycle and the functions of sewage systems, it reveals that about 83% of the estimated total LCE is required for the operation of treatment plants and the remaining 17% for the construction of treatment plants and drains.
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