Hydrothermal liquefaction (HTL) of nine algae species were performed at two reaction temperatures (280 and 320 °C) to compare the effect of their biomass composition on product yields and properties. Results obtained after HTL indicate large variations in terms of bio-oil yields and its properties. The maximum bio-oil yield (66 wt%) was obtained at 320 °C with a high lipid containing algae Nannochloropsis. The higher heating value of bio-oils ranged from 31 to 36 MJ/kg and around 50% of the bio-oils was in the vacuum gas oil range while high lipid containing algae Nannochloropsis contained a significant portion (33–42%) in the diesel range. A predictive relationship between bio-oil yields and biochemical compositions was developed and showed a broad agreement between predictive and experimental yields. The aqueous phases obtained had high amount of TOC (12–43 g/L), COD (35–160 g/L), TN (1–18 g/L), ammonium (0.34–12 g/L) and phosphate (0.7–12 g/L).
- Aqueous phase
- Biochemical composition
- Hydrothermal liquefaction
ASJC Scopus subject areas
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal