Switchgrass for bioethanol and other value-added applications: A review

Deepak R. Keshwani, Jay J. Cheng

Research output: Contribution to journalReview articlepeer-review

353 Scopus citations

Abstract

Switchgrass is a promising feedstock for value-added applications due to its high productivity, potentially low requirements for agricultural inputs and positive environmental impacts. The objective of this paper is to review published research on the conversion of switchgrass into bioethanol and other value-added products. Environmental benefits associated with switchgrass include the potential for carbon sequestration, nutrient recovery from runoff, soil remediation and provision of habitats for grassland birds. Pretreatment of switchgrass is required to improve the yields of fermentable sugars. Based on the type of pretreatment, glucose yields range from 70% to 90% and xylose yields range from 70% to 100% after hydrolysis. Following pretreatment and hydrolysis, ethanol yields range from 72% to 92% of the theoretical maximum. Other value-added uses of switchgrass include gasification, bio-oil production, newsprint production and fiber reinforcement in thermoplastic composites. Future prospects for research include increased biomass yields, optimization of feedstock composition for bioenergy applications, and efficient pentose fermentation to improve ethanol yields.

Original languageEnglish (US)
Pages (from-to)1515-1523
Number of pages9
JournalBioresource Technology
Volume100
Issue number4
DOIs
StatePublished - Feb 2009
Externally publishedYes

Keywords

  • Bioenergy
  • Ethanol
  • Lignocelluloses
  • Pretreatment
  • Switchgrass

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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