A novel perspective on the avoided burden approach applied to steel-cement making joint system
M. R. M. Saade, M. G. da Silva, V. Gomes
ARTIGO
Inglês
Agradecimentos: The authors thank FAPESP, FAEPex and CNPq for their generosity
Recycling of ground granulated blast furnace slag (ggbfs), a steelmaking process coproduct, in cement making has been typically seen as beneficial for both industry sectors involved, for the destination of an industrial waste to replace and reduce raw material intake of a second manufacturing...
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Recycling of ground granulated blast furnace slag (ggbfs), a steelmaking process coproduct, in cement making has been typically seen as beneficial for both industry sectors involved, for the destination of an industrial waste to replace and reduce raw material intake of a second manufacturing process. Within Life Cycle Assessment (LCA) methodology, the distribution of impacts between a product and its coproduct shall follow ISO 14044's guidelines. Impact distribution in multifunctional processes remains, however, as one of LCA's most controversial methodological issues. This paper analyses how multifunctional modelling methods distribute steelmaking environmental loads between pig iron and bfs, and their influence on LCA results for ordinary Portland cement and two types of blended cements with high ggbfs content commercialized in Brazil. SimaPro 7.3 supported LCA using CML 2001 (baseline) impact evaluation method. Impact allocation, by definition, induces considerable impacts on bfs. Using the avoided burden approach, impact values in all categories decreased with increased ggbfs content in cement. Though the 'avoided burden approach' succeeds to a major recycling benefit - raw material preservation - in products' life cycle modelling, it fails to distribute it properly and is not adapted to the waste user. By acknowledging that new loads arise and are neutralized over recycling implementation, this approach not only distributes environmental benefit among the partnering industries that enable recycling, but also provides a more complete and refined description of recycling implications and actual (net) avoided burden, that, among others, can better inform strategic decision-making by the involved industries
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A novel perspective on the avoided burden approach applied to steel-cement making joint system
M. R. M. Saade, M. G. da Silva, V. Gomes
A novel perspective on the avoided burden approach applied to steel-cement making joint system
M. R. M. Saade, M. G. da Silva, V. Gomes
Fontes
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Expanding boundaries: systems thinking in the built environment (2016), p. 310-314 |