| Summary: | 碩士 === 國立中興大學 === 森林學系所 === 98 === Since the industrial revolution, human activities have been consumed most of fossil resources with the release of a huge amount of carbon, and cause the greenhouse effect. Recently, scientists have been pointed out that the production of the global crude oil will be facing a shortage in the near future. In order to restrain the global warming and energy depletion, exploring a clean and sustainability of biofuels should be the only solution. Therefore, this study was to evaluate the environmental effect and energy efficiency in production of sweet sorghum ethanol by using life cycle assessment to understand the domestic development of bioethanol fuel adaptability. The results showed that the development of sweet sorghum ethanol in energy efficiency and greenhouse gas reduction presents good performance. The total energy input for production of sweet sorghum bioethanol was 5.75 MJ/L, while the total energy output was 24.28 MJ/L. With the lower heating value of 21.2 MJ/L, the net energy value of the sweet sorghum bioethanol was 18.55 MJ/L, and the net energy ratio was 4.24. In addition, the total greenhouse gas emissions were 469 g-CO2 eq/L with a net reduction benefit of 0.998 kg/L, and the reduction efficiency of 44.2%. Moreover, installing a CHP system using the bagasse can enhance the net energy ratio up to 6.72 with a total greenhouse gas emissions reduction efficiency of 96.9%. Therefore, the development of sweet sorghum biofuels in Taiwan can reduce dependence on imported oil.
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