Bioethanol from corn stover – Global warming footprint of alternative biotechnologies

Yan Zhao, Anders Damgaard, Yingjie Xu, Shan Liu, Thomas Højlund Christensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Bioethanol from residual corn stover could contribute to lowering CO2 loads within the transport sector, if used as an amendment to gasoline. We modelled by life cycle assessment and Monte Carlo simulation seven different technological configurations for producing bioethanol from corn stover based on consistent mass flows and estimated ethanol production extracted from 141 datasets of reasonable quality. By parametrizing key processes and determining their statistical distribution based on actual data, we were able to estimate the Global Warming Potential (GWPs) for all the alternative technologies on a system level. Most of the individual cases showed a net saving in GWP when the savings obtained from recovering energy from anaerobic digestion of the liquid residues and incineration of the solid residues were included. The net savings could in some cases be as high as 900 ∼ 1200 kg CO2-eq/t dry corn stover solids. If the residues were not subject to energy recovery, the production of bioethanol and use in gasoline would be a net load to global warming in more than 50% of the technological configurations. The “best-practice”, defined as the top 15% cumulative probability with respect to GWP, suggests that technologies based on steam explosion and ammonia-based pretreatment appear statistically the most promising and could contribute, with residue energy recovery, to GWP savings of 850–1050 kg CO2-eq/t dry corn stover solids and produce in the range 178–216 kg of bioethanol. This paper provides insights into the key parameters for bioethanol production from corn stover and suggests areas for further research.
Original languageEnglish
JournalApplied Energy
Volume247
Pages (from-to)237-253
ISSN0306-2619
DOIs
Publication statusPublished - 2019

Keywords

  • Bioethanol
  • Corn stover
  • Life cycle assessment
  • Global warming potential
  • Probability distribution
  • Uncertainty analysis

Cite this

@article{dac412806b0c43ada58204ca89917e46,
title = "Bioethanol from corn stover – Global warming footprint of alternative biotechnologies",
abstract = "Bioethanol from residual corn stover could contribute to lowering CO2 loads within the transport sector, if used as an amendment to gasoline. We modelled by life cycle assessment and Monte Carlo simulation seven different technological configurations for producing bioethanol from corn stover based on consistent mass flows and estimated ethanol production extracted from 141 datasets of reasonable quality. By parametrizing key processes and determining their statistical distribution based on actual data, we were able to estimate the Global Warming Potential (GWPs) for all the alternative technologies on a system level. Most of the individual cases showed a net saving in GWP when the savings obtained from recovering energy from anaerobic digestion of the liquid residues and incineration of the solid residues were included. The net savings could in some cases be as high as 900 ∼ 1200 kg CO2-eq/t dry corn stover solids. If the residues were not subject to energy recovery, the production of bioethanol and use in gasoline would be a net load to global warming in more than 50{\%} of the technological configurations. The “best-practice”, defined as the top 15{\%} cumulative probability with respect to GWP, suggests that technologies based on steam explosion and ammonia-based pretreatment appear statistically the most promising and could contribute, with residue energy recovery, to GWP savings of 850–1050 kg CO2-eq/t dry corn stover solids and produce in the range 178–216 kg of bioethanol. This paper provides insights into the key parameters for bioethanol production from corn stover and suggests areas for further research.",
keywords = "Bioethanol, Corn stover, Life cycle assessment, Global warming potential, Probability distribution, Uncertainty analysis",
author = "Yan Zhao and Anders Damgaard and Yingjie Xu and Shan Liu and Christensen, {Thomas H{\o}jlund}",
year = "2019",
doi = "10.1016/j.apenergy.2019.04.037",
language = "English",
volume = "247",
pages = "237--253",
journal = "Applied Energy",
issn = "0306-2619",
publisher = "Pergamon Press",

}

Bioethanol from corn stover – Global warming footprint of alternative biotechnologies. / Zhao, Yan; Damgaard, Anders; Xu, Yingjie; Liu, Shan; Christensen, Thomas Højlund.

In: Applied Energy, Vol. 247, 2019, p. 237-253.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Bioethanol from corn stover – Global warming footprint of alternative biotechnologies

AU - Zhao, Yan

AU - Damgaard, Anders

AU - Xu, Yingjie

AU - Liu, Shan

AU - Christensen, Thomas Højlund

PY - 2019

Y1 - 2019

N2 - Bioethanol from residual corn stover could contribute to lowering CO2 loads within the transport sector, if used as an amendment to gasoline. We modelled by life cycle assessment and Monte Carlo simulation seven different technological configurations for producing bioethanol from corn stover based on consistent mass flows and estimated ethanol production extracted from 141 datasets of reasonable quality. By parametrizing key processes and determining their statistical distribution based on actual data, we were able to estimate the Global Warming Potential (GWPs) for all the alternative technologies on a system level. Most of the individual cases showed a net saving in GWP when the savings obtained from recovering energy from anaerobic digestion of the liquid residues and incineration of the solid residues were included. The net savings could in some cases be as high as 900 ∼ 1200 kg CO2-eq/t dry corn stover solids. If the residues were not subject to energy recovery, the production of bioethanol and use in gasoline would be a net load to global warming in more than 50% of the technological configurations. The “best-practice”, defined as the top 15% cumulative probability with respect to GWP, suggests that technologies based on steam explosion and ammonia-based pretreatment appear statistically the most promising and could contribute, with residue energy recovery, to GWP savings of 850–1050 kg CO2-eq/t dry corn stover solids and produce in the range 178–216 kg of bioethanol. This paper provides insights into the key parameters for bioethanol production from corn stover and suggests areas for further research.

AB - Bioethanol from residual corn stover could contribute to lowering CO2 loads within the transport sector, if used as an amendment to gasoline. We modelled by life cycle assessment and Monte Carlo simulation seven different technological configurations for producing bioethanol from corn stover based on consistent mass flows and estimated ethanol production extracted from 141 datasets of reasonable quality. By parametrizing key processes and determining their statistical distribution based on actual data, we were able to estimate the Global Warming Potential (GWPs) for all the alternative technologies on a system level. Most of the individual cases showed a net saving in GWP when the savings obtained from recovering energy from anaerobic digestion of the liquid residues and incineration of the solid residues were included. The net savings could in some cases be as high as 900 ∼ 1200 kg CO2-eq/t dry corn stover solids. If the residues were not subject to energy recovery, the production of bioethanol and use in gasoline would be a net load to global warming in more than 50% of the technological configurations. The “best-practice”, defined as the top 15% cumulative probability with respect to GWP, suggests that technologies based on steam explosion and ammonia-based pretreatment appear statistically the most promising and could contribute, with residue energy recovery, to GWP savings of 850–1050 kg CO2-eq/t dry corn stover solids and produce in the range 178–216 kg of bioethanol. This paper provides insights into the key parameters for bioethanol production from corn stover and suggests areas for further research.

KW - Bioethanol

KW - Corn stover

KW - Life cycle assessment

KW - Global warming potential

KW - Probability distribution

KW - Uncertainty analysis

U2 - 10.1016/j.apenergy.2019.04.037

DO - 10.1016/j.apenergy.2019.04.037

M3 - Journal article

VL - 247

SP - 237

EP - 253

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

ER -