Composition and Properties of microalgae Biomass Hydrothermal Liquefaction Products

From the Cultivation of Arthrospira platensis at an Increased CO2 Concentration to the Bio-Oil Production by Hydrothermal Liquefaction

“…It is considered that the changes in the concentration of carbon dioxide during the cultivation of Arthrospira platensis affects the changes in the proportions of the aqueous phase and bio-oil and that the yield of biochar and of gaseous products is almost constant. In the currently work, we show a decrease of the yield of biochar and of gaseous products when compared with [50]. An increase in the yield of the aqueous phase shows the promise of this direction for studying its application.…”

“…Figure 6a shows previous results regarding HTL product yields with this strain of Arthrospira platensis cultivated under atmospheric conditions. The HTL conditions are similar to those that are used in the current work with one exception: 100 g of dry biomass and 330 mL of distilled water were placed in the reactor [50]. In Figure 6b are the results regarding the yield of the HTL products of wet concentrated biomass obtained during the current work.…”

“…The product yield of Arthrospira platensis hydrothermal liquefaction (wt. %) when cultivating Arthrospira platensis in an atmospheric medium (a) [50] or in a medium with an initial CO2 concentration of 8 vol. % (b).…”

“…%, which was caused by an increase in the amount of carbohydrates and a decrease in the amount of lipids when Arthrospira platensis was cultivated in a medium with high carbon dioxide content [27]. This leads to the bio-oil yield decrease, as the main contribution to the bio-oil yield is due to lipids [50]. This can also be seen when comparing Figure 6a and Figure 6b: the bio-oil yield decreased from 32.6 to 18.5 wt.…”