Cited by 226Algal biology and biofuel productionEnvironmental Impact and SustainabilityBioenergy crop production and management

Environmental Impacts of Algae-Derived Biodiesel and Bioelectricity for Transportation

Clarens, Andres F., Nassau, Hagai, Resurreccion, Eleazer P., White, Mark A., Colosi, Lisa M.·2011·Environmental Science & Technology

Abstract

Algae are a widely touted source of bioenergy with high yields, appreciable lipid contents, and an ability to be cultivated on marginal land without directly competing with food crops. Nevertheless, recent work has suggested that large-scale deployment of algae bioenergy systems could have unexpectedly high environmental burdens. In this study, a "well-to-wheel" life cycle assessment was undertaken to evaluate algae's potential use as a transportation energy source for passenger vehicles. Four algae conversion pathways resulting in combinations of bioelectricity and biodiesel were assessed for several relevant nutrient procurement scenarios. Results suggest that algae-to-energy systems can be either net energy positive or negative depending on the specific combination of cultivation and conversion processes used. Conversion pathways involving direct combustion for bioelectricity production generally outperformed systems involving anaerobic digestion and biodiesel production, and they were found to generate four and fifteen times as many vehicle kilometers traveled (VKT) per hectare as switchgrass or canola, respectively. Despite this, algae systems exhibited mixed performance for environmental impacts (energy use, water use, and greenhouse gas emissions) on a "per km" basis relative to the benchmark crops. This suggests that both cultivation and conversion processes must be carefully considered to ensure the environmental viability of algae-to-energy processes.

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Crossref · 10.1021/es200760n

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Authors
Clarens, A. F., Nassau, H., Resurreccion, E. P., White, M. A., & Colosi, L. M.
Affiliations
  • Civil and Environmental Engineering and ‡McIntire School of Commerce, University of Virginia, Charlottesville, Virginia 22904, United States
  • University of Virginia (US)
Corresponding author
Colosi, Lisa M.
Venue
Environmental Science & Technology
Published
2011-08-03
Volume
45
Issue
17
Pages
7554-7560
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2071132308
Cited by
226
References
27
Citations by year
2026: 5 · 2025: 7 · 2024: 5 · 2023: 7 · 2022: 12 · 2021: 14 · 2020: 9 · 2019: 15 · 2018: 18 · 2017: 17 · 2016: 19 · 2015: 16 · 2014: 35 · 2013: 20 · 2012: 25
FWCI
10.89
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Energy
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental Impact and Sustainability
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Bioenergy crop production and management
Keywords
algal biodiesel, transportation energy use, net energy analysis, anaerobic digestion, direct combustion, greenhouse gas emissions, water consumption, vehicle kilometers traveled, switchgrass, canola, marginal land cultivation
MeSH terms
Agriculture, Chlorophyta, Bioelectric Energy Sources, Energy-Generating Resources, Environment, Models, Theoretical, Monte Carlo Method, Transportation, Biomass, Crops, Agricultural, Biofuels

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