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Type: Artigo de periódico
Title: Integrated environmental assessment of biodiesel production from soybean in Brazil
Author: Cavalett, O
Ortega, E
Abstract: This paper presents the results of an environmental impact assessment of biodiesel production from soybean in Brazil. In order to achieve this objective, environmental impact indicators provided by Emergy Accounting (EA), Embodied Energy Analysis (EEA) and Material Flow Accounting (MFA) were used. The results showed that for one liter of biodiesel 8.8 kg of topsoil are lost in erosion, besides the cost of 0.2 kg of fertilizers, about 5.2 m(2) of crop area, 7.33 kg of abiotic materials, 9.0 tons of water and 0.66 kg of air and about 0.86 kg Of CO(2) were released. About 0.27 kg of crude oil equivalent is required as inputs to produce one liter of biodiesel, which means an energy return of 2.48 J of biodiesel per joule of fossil fuel invested. The transformity of biodiesel (3.90E + 05 seJ J(-1)) is higher than those calculated for fossil fuels as other biofuels, indicating a higher demand for direct and indirect environmental support. Similarly, the biodiesel emergy yield ratio (1.62) indicates that a very low net emergy is delivered to consumers, compared to alternatives. Obtained results show that when crop production and industrial conversion to fuel are supported by fossil fuels in the form of chemicals, goods, and process energy, the fraction of fuel that can actually be considered renewable is very low (around 31%). (C) 2009 Elsevier Ltd. All rights reserved.
Subject: Emergy accounting
Embodied energy
Material flow accounting
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Journal Of Cleaner Production. Elsevier Sci Ltd, v. 18, n. 1, n. 55, n. 70, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.jclepro.2009.09.008
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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