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Influence of biochemical composition during hydrothermal liquefaction of algae on product yields and fuel properties
- Shakya, Rajdeep, Adhikari, Sushil, Mahadevan, Ravishankar, Shanmugam, Saravanan R., Nam, Hyungseok, Hassan, El Barbary, Dempster, Thomas A.
- Bioresource technology 2017 v.243 pp. 1112-1120
- Nannochloropsis, algae, ammonium, biofuels, biomass, chemical composition, chemical oxygen demand, lipids, liquefaction, oils, phosphates, temperature
- 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 (66wt%) was obtained at 320°C with a high lipid containing algae Nannochloropsis. The higher heating value of bio-oils ranged from 31 to 36MJ/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 (12–43g/L), COD (35–160g/L), TN (1–18g/L), ammonium (0.34–12g/L) and phosphate (0.7–12g/L).