Journal
BIOMASS & BIOENERGY
Volume 24, Issue 4-5, Pages 321-327Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0961-9534(02)00169-1
Keywords
life cycle assessment; greenhouse gases; environmental emissions; environmental impacts; logging residues; sawmill residues; bioenergy
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Bioenergy has an important role in the implementation of the Kyoto agreement in Finland. The main sources of wood residues for energy production are logging areas and sawmills. The use of forest chips can be of great significance in reducing carbon dioxide emissions by replacing fossil fuels. Increasing the use of forest chips has environmental benefits, but it also includes possible environmental disadvantages. Therefore, system research is needed to assess the forest chip utilisation prospects for their environmental quality to secure sustainable forest management. Life-cycle methodology was developed and applied to assess environmental burdens and impacts of the logging and sawmill residues throughout the whole fuel chain from the forest to energy production. According to the study, the energy efficiencies of the forest chip systems are quite high. Net CO2 emissions of the systems are low owing to the low input of external primary energy required to operate the systems. Although wood energy is renewable, it has many similarities with fossil fuels, e.g. as the emissions of the conversion phase are significant. (C) 2003 Elsevier Science Ltd. All rights reserved.
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