Chemical properties of biocrude oil from the hydrothermal liquefaction of Spirulina algae, swine manure, and digested anaerobic sludge

Derek R. Vardon, B. K. Sharma, John Scott, Guo Yu, Zhichao Wang, Lance Schideman, Yuanhui Zhang, Timothy J. Strathmann

Research output: Contribution to journalArticle

Abstract

This study explores the influence of wastewater feedstock composition on hydrothermal liquefaction (HTL) biocrude oil properties and physico-chemical characteristics. Spirulina algae, swine manure, and digested sludge were converted under HTL conditions (300°C, 10-12. MPa, and 30. min reaction time). Biocrude yields ranged from 9.4% (digested sludge) to 32.6% (Spirulina). Although similar higher heating values (32.0-34.7. MJ/kg) were estimated for all product oils, more detailed characterization revealed significant differences in biocrude chemistry. Feedstock composition influenced the individual compounds identified as well as the biocrude functional group chemistry. Molecular weights tracked with obdurate carbohydrate content and followed the order of Spirulina<. swine manure. <. digested sludge. A similar trend was observed in boiling point distributions and the long branched aliphatic contents. These findings show the importance of HTL feedstock composition and highlight the need for better understanding of biocrude chemistries when considering bio-oil uses and upgrading requirements.

Original languageEnglish (US)
Pages (from-to)8295-8303
Number of pages9
JournalBioresource Technology
Volume102
Issue number17
DOIs
StatePublished - Sep 1 2011

Keywords

  • Algae
  • Digested sludge
  • Hydrothermal liquefaction
  • Spirulina
  • Swine manure

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

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