Transition towards a more environmentally sustainable biodiesel in South America: The case of Chile

This study uses a site-specific life cycle assessment (LCA) to evaluate the environmental profile and energy and water demand of potential production options for rapeseed biodiesel in Chile. The first step is the analysis of the biodiesel supply chain in a standard scenario, associated with the most likely production conditions. The second step is the evaluation of the following alternative scenarios related to a production strategy involving low-impact or renewable resources: (1) Addition of livestock manure as organic fertilizer, (2) Use of degraded grassland, (3) Biodiesel transport by rail, and (4) Use of forest residues for industrial steam. The results show that the biodiesel in the standard scenario has less environmental impacts than fossil diesel in 4 of the 13 indicators evaluated. The rapeseed production is the stage with the highest contribution to impacts. The scenario 1 presents the best environmental profile. The scenario 2 reduces the greenhouse gas emissions of biodiesel. The scenarios 3 and 4 moderately improve the profile of the biofuel. The four situations could be implemented in the short term, but should be backed up by economic and social studies.

► Rapeseed biodiesel accounts for a 40% GHG emissions savings compared to fossil diesel.
► Biodiesel has greater impacts than fossil diesel in 7 of the 13 indicators evaluated.
► Agricultural stage cause the greatest impacts in biodiesel pathway.
► A production strategy involving low-impact or renewable resources should be used.
► Use of livestock manure as organic fertilizer presents the best environmental profile.