Life Cycle Assessment of Bioethanol Production: a Case Study from Poplar Biomass Growth in the U.S. Pacific Northwest

Rodrigo Morales-Vera*, Leonardo Vásquez-Ibarra, Felipe Scott, Maureen Puettmann, Richard Gustafson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Biomass appears to be one of the most prominent renewable resources for biofuels such as bioethanol, mainly due to its better environmental performance compared with fossil fuels. This study addresses a comprehensive environmental performance of bioethanol production, employing empirical data from hybrid poplar grown in the U.S. The study considers 1 MJ as a functional unit and employs a cradle-to-grave approach, which entails the feedstock and harvesting production of poplar, transport to a biorefinery, bioconversion of the biomass process, and fuel use. On average, bioconversion is the main contributor to environmental degradation in all the categories evaluated (77%). The second main contributor is either the feedstock and harvesting production of poplar (17%) or fuel use (6%), depending on the environmental category. Thus, focusing on only one category may induce a misinterpretation of the environmental performance of bioethanol production. Finally, environmental credits in the global warming potential (GWP) category were obtained from the carbon sequestered in the biomass during the growing period and from avoided fossil fuel emissions due to electricity production from a renewable source. This means that the net GWP of the life cycle of bioethanol from poplar biomass is slightly negative (−1.05 × 10−3 kg CO2-eq·MJ−1).

Original languageEnglish
Article number734
Pages (from-to)1-14
Number of pages14
JournalFermentation
Volume8
Issue number12
DOIs
StatePublished - 13 Dec 2022

Bibliographical note

Publisher Copyright:
© 2022 by the authors.

Keywords

  • LCA
  • bioconversion process
  • bioethanol
  • carbon sequestration
  • global warming potential

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