日本におけるバイオエタノールの生産コストとCO_2削減コスト分析(<小特集>エネルギー転換・利用に関わる若手研究者の勉強会活動報告)

概要

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This paper aims to make a trial calculation of lignocellulosic bioethanol production costs and CO_2 reduction costs in Japan. The following three are our conclusions. First lignocellulosic bioethanol potentials are very limited within the 50km radius which is the optimal transport distance economically and environmentally perspectives. The optimal size of bioethanol plants are: 20 million litter per year in the present case and 70 million litter per year in the innovative case. Secondly we estimate lignocellulosic bioethanol production costs including both the present case and the innovative case. In the innovative case, we use the following two factors: technological innovation factor in enzymatic breakdown and fermentation process, and plants up-scale factor. Bioethanol production costs (litter of petrol equivalent) are 98 Yen per litter in the present case, and 58 Yen/litter in the innovative case. Thirdly we calculate CO_2 reduction costs by bioethanol as a substitute petrol. Petrol costs range between 20 to 90USD per barrel. CO_2 reduction costs of the present case is 78, 000-150, 000 JPY/CO_2-ton, much expensive than the other CO_2 mitigation options. Regarding the innovative case, CO_2 reduction costs are 20, 000-30, 000 JPY/CO_2-ton only in high oil price 70 to 90USD/bbl.
2007-12-20