Hydrothermal liquefaction of Spirulina and Nannochloropsis salina under subcritical and supercritical water conditions

Saqib S. Toor, Harvind Reddy, Shuguang Deng, Jessica Hoffmann, Dorte Spangsmark, Linda B. Madsen, Jens Bo Holm-Nielsen, Lasse A. Rosendahl

Research output: Contribution to journalArticlepeer-review

161 Scopus citations

Abstract

Six hydrothermal liquefaction experiments on Nannochloropsis salina and Spirulina platensis at subcritical and supercritical water conditions (220-375 °C, 20-255. bar) were carried out to explore the feasibility of extracting lipids from wet algae, preserving nutrients in lipid-extracted algae solid residue, and recycling process water for algae cultivation. GC-MS, elemental analyzer, FT-IR, calorimeter and nutrient analysis were used to analyze bio-crude, lipid-extracted algae and water samples produced in the hydrothermal liquefaction process. The highest bio-crude yield of 46% was obtained on N. salina at 350 °C and 175. bar. For S. platensis algae sample, the optimal hydrothermal liquefaction condition appears to be at 310 °C and 115. bar, while the optimal condition for N. salina is at 350 °C and 175. bar. Preliminary data also indicate that a lipid-extracted algae solid residue sample obtained in the hydrothermal liquefaction process contains a high level of proteins.

Original languageEnglish (US)
Pages (from-to)413-419
Number of pages7
JournalBioresource Technology
Volume131
DOIs
StatePublished - Mar 2013
Externally publishedYes

Keywords

  • Algal biofuel
  • Hydrothermal liquefaction
  • Nannochloropsis salina
  • Spirulina
  • Subcritical water

ASJC Scopus subject areas

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

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