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 language | English (US) |
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Pages (from-to) | 130-139 |
Number of pages | 10 |
Journal | Bioresource Technology |
Volume | 152 |
DOIs | |
State | Published - 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