Produção Nacional
Use of the life cycle assessment (LCA) for comparison of the environmental performance of four alternatives for the treatment and disposal of bioethanol stillage.
2010; Agra Europe; Volume: 112; Issue: 1343 Linguagem: Inglês
ISSN
0020-8841
AutoresMateus Henrique Rocha, Electo Eduardo Silva Lora, O. J. Venturinl, José C. Escobar, José Joaquim Conceição Soares Santos, Alexandra Moura,
Tópico(s)Water-Energy-Food Nexus Studies
ResumoNEW alternative routes for the treatment and disposal of stillage should be proposed, as fertigation could become unfeasible, due to the increasing transport costs and environmental concerns. The aim of this paper is to show the results of the application of the Life Cycle Assessment methodology for the analysis and comparison of four alternatives for stillage treatment and disposal: conventional ‘in natura’ fertigation, anaerobic digestion, concentration until 40% for fertigation and concentration until 65% for combustion in boilers using fuel oil as supplementary fuel. For the LCA study, a hypothetic Standard Sugar and Alcohol Mill was assumed with a milling capacity of 1.99 million tonnes of sugarcane per crop, producing 154 thousand tonnes of sugar and 81 thousand m³ of ethanol. The mill is located near the city of Sertaozinho and local soil characteristics were also considered. The environmental evaluation results comparing the 4 alternatives of disposal are shown. The Simapro® software and the CML 2 baseline 2000 are used as support tools. Conventional and concentrated stillage fertigation alternatives have the best environmental performance. In the combustion of stillage, we considered the installation of pollution control devices for SOx and NOx with 95% efficiency. From the point of view of climate change, based on the life cycle greenhouse gases balance, the best alternative was biodigestion.
Referência(s)