Hydrothermal liquefaction of mixed-culture algal biomass from wastewater treatment system into bio-crude oil

Wan Ting Chen, Yuanhui Zhang, Jixiang Zhang, Guo Yu, Lance C. Schideman, Peng Zhang, Mitchell Minarick

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, a mixed-culture algal biomass harvested from a functioning wastewater treatment system (AW) was hydrothermally converted into bio-crude oils. The highest bio-crude oil yield (49% of volatile matter) and the highest energy recovery were obtained at 300. °C with 1. h retention time. The highest heating value of the bio-crude oil was 33.3. MJ/kg, produced at 320. °C and 1. h retention time. Thermogravimetric analysis showed approximately 60% of the bio-crude oils were distilled in the range of 200-550. °C; and the solid residue might be suitable for use in asphalt. GC-MS results indicated that the bio-crude oil contained hydrocarbons and fatty acids, while the aqueous product was rich in organic acids and cyclic amines. The nitrogen recovery (NR) in the bio-crude oil ranged from 8.41% to 16.8%, which was lower than the typical range of 25%-53% from previous studies.

Original languageEnglish (US)
Pages (from-to)130-139
Number of pages10
JournalBioresource Technology
Volume152
DOIs
StatePublished - Jan 2014

Keywords

  • Algae
  • Bio-crude oil
  • Hydrothermal liquefaction (HTL)
  • Nitrogen recovery
  • Wastewater treatment

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

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