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Methods of dealing with co-products of biofuels in life-cycle analysis and consequent results within the U.S. context

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  • Wang, Michael
  • Huo, Hong
  • Arora, Salil
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    Abstract

    Products other than biofuels are produced in biofuel plants. For example, corn ethanol plants produce distillers' grains and solubles. Soybean crushing plants produce soy meal and soy oil, which is used for biodiesel production. Electricity is generated in sugarcane ethanol plants both for internal consumption and export to the electric grid. Future cellulosic ethanol plants could be designed to co-produce electricity with ethanol. It is important to take co-products into account in the life-cycle analysis of biofuels and several methods are available to do so. Although the International Standard Organization's ISO 14040 advocates the system boundary expansion method (also known as the "displacement method" or the "substitution method") for life-cycle analyses, application of the method has been limited because of the difficulty in identifying and quantifying potential products to be displaced by biofuel co-products. As a result, some LCA studies and policy-making processes have considered alternative methods. In this paper, we examine the available methods to deal with biofuel co-products, explore the strengths and weaknesses of each method, and present biofuel LCA results with different co-product methods within the U.S. context.

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    Bibliographic Info

    Article provided by Elsevier in its journal Energy Policy.

    Volume (Year): 39 (2011)
    Issue (Month): 10 (October)
    Pages: 5726-5736

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    Handle: RePEc:eee:enepol:v:39:y:2011:i:10:p:5726-5736

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    Web page: http://www.elsevier.com/locate/enpol

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    Keywords: Biofuels Life-cycle analysis Co-products;

    References

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    1. Wang, Michael Q., 2008. "Well-to-Wheels Energy and Greenhouse Gas Emission Results and Issues of Fuel Ethanol," Lifecycle Carbon Footprint of Biofuels Workshop, January 29, 2008, Miami Beach, Florida 49098, Farm Foundation.
    2. מחקר - ביטוח לאומי, 2007. "ינואר 2007," Working Papers 212, National Insurance Institute of Israel.
    3. Searchinger, Timothy & Heimlich, Ralph & Houghton, R. A. & Dong, Fengxia & Elobeid, Amani & Fabiosa, Jacinto F. & Tokgoz, Simla & Hayes, Dermot J. & Yu, Hun-Hsiang, 2008. "Use of U.S. Croplands for Biofuels Increases Greenhouse Gases Through Emissions from Land-Use Change," Staff General Research Papers 12881, Iowa State University, Department of Economics.
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    Cited by:
    1. Fabio Menten & Benoît Chèze & Laure Patouillard & Frédérique Bouvart, 2013. "The use of Meta-Regression Analysis to harmonize LCA literature: an application to GHG emissions of 2nd and 3rd generation biofuels," Working Papers 2013/01, INRA, Economie Publique.

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