Journal
FUEL
Volume 197, Issue -, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2017.02.022
Keywords
Microalgae; Low temperature NaOH/urea solvent pre-treatment; Hydrothermal liquefaction; Bio-crude oil
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Funding
- BioFuelNet Canada, a Network of Centres of Excellence
- NSERC
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High-energy and cost-intensive cell disruption processes represent one of the major techno-economic bottlenecks in the microalgae-based bio-refineries. Therefore, a feasible disruption method is required to ensure low energy input and operating cost, as well as high target-product (e.g., lipid) recovery. In this study, several different pre-treatment strategies for the disruption of Chlorella vulgaris were investigated, including NaOH/urea, sulfuric acid and ultra-sonication. Experimental results showed that the pretreatment by NaOH/urea solution resulted in an average mass loss of 33.7 wt.%, and resulted in the removal of 77.2% of carbohydrates and 46.3% of protein (as N) from the original biomass. While these results were comparable to those obtained from the other cell disruption methods, the NaOH/urea method is believed to be more advantageous in terms of energy-efficiency and cost. Afterwards, all pre-treated microalgae samples were subjected to the liquefaction process towards bio-crude oil production. The bio-crude oils obtained from NaOH/urea solvent pre-treated microalgae resulted in higher yields and demonstrated better flow properties. (C) 2017 Elsevier Ltd. All rights reserved.
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