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Life cycle assessment of fuel chip production from eucalypt forest residues

  • WOOD AND OTHER RENEWABLE RESOURCES
  • Published:
The International Journal of Life Cycle Assessment Aims and scope Submit manuscript

Abstract

Purpose

Forest residues are becoming an increasingly important bioenergy feedstock. This study evaluates the environmental impacts associated with the production of fuel chips from eucalypt logging residues in Portugal, in order to identify the supply chains and machinery that bring the best environmental performance. Besides, the stages and operations with the largest environmental impact are identified.

Methods

Life cycle assessment methodology is used starting with forest management up to delivery of chips to power plant. Three different configurations for logging residue processing were simulated as follows: roadside chipping of loose residues, terminal chipping of loose residues, and terminal chipping of bundled residues. In addition, the use of different equipment for tree felling and extraction of logging residue was considered. The default impact assessment methodology was the CML. In a sensitivity analysis, calculations were performed using characterization factors recommended by the International Reference Life Cycle Data System (ILCD). Different allocation criteria were tested for partitioning the environmental burdens between wood and forest residues produced during the stage of forest management.

Results and discussion

Roadside chipping of loose residues seems to have less impacts regardless of the equipment used in tree felling and residue forwarding. However, for photochemical oxidant formation, this is not the case when trees are felled with a chainsaw when the CML methodology is applied. For the systems with terminal chipping, the better option will depend both on type of machinery used and distances traveled between the forest site and the power plant. The forest management stage has a relevant contribution to all the supply chains analyzed. Chipping and bundling have also important impacts, as well as forwarding when this operation is accomplished with a modified farm tractor. Moreover, transports have a significant impact when loose residues are chipped in a terminal.

Conclusions

The choice of the allocation method between wood and residues affects significantly the absolute results, but it is irrelevant when the objective is to select the best supply chain configuration. The results obtained are valid for the input data considered, which rely on average values representative of the current most typical practices in Portugal. However, this methodology can also be applied as a decision supporting tool to select the supply chain with the best environmental performance on a case by case basis, using site-specific data.

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Notes

  1. Diesel, at regional storage/RER; petrol, two-stroke blend, at regional storage/RER; lubricating oil, at plant/RER; ammonium sulphate, as N, at regional storehouse/RER; triple superphosphate, as P2O5, at regional storehouse/RER; potassium chloride, as K2O, at regional storehouse/RER.

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Acknowledgments

This study has been supported by the project ECOTECH SUDOE—International Network on LCA and Ecodesign for Eco-innovation (SOE2/P2/E377) funded by the EU Interreg IV B Sudoe Programme. Thanks are also due to FCT (Science and Technology Foundation; Portugal) for the scholarship granted to Ana Cláudia Dias (SFRH/BPD/75788/2011). The author also expresses her gratitude to Luis Arroja (CESAM/DAO—University of Aveiro) for supervising her work and constructive comments.

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Correspondence to Ana Cláudia Dias.

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Responsible editor: Christian Bauer

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Dias, A.C. Life cycle assessment of fuel chip production from eucalypt forest residues. Int J Life Cycle Assess 19, 705–717 (2014). https://doi.org/10.1007/s11367-013-0671-4

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