| Summary: | 碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 100 === Slow pyrolysis offers an energetic efficiency for bio-energy production, and the soil application of biochar reduces greenhouse gas （GHG） emissions to a greater extent than when the biochar is used as fuel to offset fossil fuel emissions. Scenarios for biochar production were examined using a life-cycle assessment which is known as a “cradle to grave” approach. The purposes of this study are assessing the capability of GHG reduction in biochar system and the total energy generation during biochar production. The life cycle environmental performances of three different Taiwan trees （Leucaena leucocephala, Eucalyptus spp. and Acacia confusa） and the waste driftwoods were estimated. And the functional units of each system are 30-year period/ha and 10,000 tons of driftwoods. The effects of impact assessment were calculated by using LCA software – SimaPro program. All of the feedstock provides a positive energy generation and negative GHG emission. The cultivation of Eucalyptus spp. performs a better way to decrease GHG emission (112 ton CO2 eq) and fossil fuel consumption (3,100 GJ eq) due to its high generation of biomass. The driftwood system could reduce 5,500 ton CO2 eq and provide 484 TJ of substitution energy. The result shows that the bio-energy system with bio-energy and biochar production rather than solely for bio-energy production can efficiently mitigate the climate change by a great amount of GHG sequestration.
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