Pilot-scale data provide enhanced estimates of the life cycle energy and emissions profile of algae biofuels produced via hydrothermal liquefaction

TitlePilot-scale data provide enhanced estimates of the life cycle energy and emissions profile of algae biofuels produced via hydrothermal liquefaction
Publication TypeJournal Article
Year of Publication2013
AuthorsLiu X.W, Saydah B., Eranki P., Colosi L.M, Mitchell B.G, Rhodes J., Clarens A.F
JournalBioresource Technology
Volume148
Pagination163-171
Date Published2013/11
Type of ArticleArticle
ISBN Number0960-8524
Accession NumberWOS:000326905400023
KeywordsAlgae; biodiesel; biofuels; Energy return on investment; ethanol; Hydrothermal liquefaction; Life cycle assessment; microalgae; oil
Abstract

Life cycle assessment (LCA) has been used widely to estimate the environmental implications of deploying algae-to-energy systems even though no full-scale facilities have yet to be built. Here, data from a pilot-scale facility using hydrothermal liquefaction (HTL) is used to estimate the life cycle profiles at full scale. Three scenarios (lab-, pilot-, and full-scale) were defined to understand how development in the industry could impact its life cycle burdens. HTL-derived algae fuels were found to have lower greenhouse gas (GHG) emissions than petroleum fuels. Algae-derived gasoline had significantly lower GHG emissions than corn ethanol. Most algae-based fuels have an energy return on investment between 1 and 3, which is lower than petroleum biofuels. Sensitivity analyses reveal several areas in which improvements by algae bioenergy companies (e.g., biocrude yields, nutrient recycle) and by supporting industries (e.g., CO2 supply chains) could reduce the burdens of the industry. (C) 2013 Elsevier Ltd. All rights reserved.

DOI10.1016/j.biortech.2013.08.112
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Student Publication: 
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