Abstract
Description of the subject. The present study examined the effect of temperature (15, 20, 25, 30, 35 and 40 °C) on biomass, esterified fatty acids content and fatty acid productivity of Scenedesmus acutus. Objectives. This work aimed to study the effect of variation in temperature on lipid productivity and fatty acid profiles of S. acutus as a feedstock for biodiesel production. Method. The alga was grown under different temperatures and its biomass, as well as fatty acid content and composition, were determined. Results. The maximum growth rate of S. acutus was achieved at 30 °C , but there was no significant difference in biomass productivity at 25 and 30 °C (0.41 and 0.42 g·l-1·d-1), respectively. The highest fatty acid content (104.1 mg·g-1 CDW) was recorded at low temperature (15 °C) and decreased with increasing temperature. As a result of high biomass production, fatty acids productivity showed the highest values (41.27 and 42.10 mg·l-1·d-1) at 25 and 30 °C, respectively. The proportion of saturated and mono-unsaturated fatty acids increased from 13.72 to 23.79% and from 11.13 to 33.10% of total fatty acids when the incubation temperature was raised from 15 to 40 °C, respectively. The increase of temperature from 15 to 40 °C decreased the poly-unsaturated fatty acids from 75.15% to 43.10% of total fatty acids, respectively. Conclusions. The present study concluded that incubation temperature was a critical parameter for quantitative and qualitative fatty acid compositions of S. acutus. In addition, the type and proportion of individual fatty acids, which interfere with biodiesel quality, can be modified using different incubation temperatures in order to meet the biodiesel international standards.
Highlights
Contemporary global energy usage is based on utilization of fossil fuels including natural gas, coal and oil. Barbir (2009) concluded that the use of fossil fuels has several problems, such as: – pollution at local, regional and global scales; – risk of complete depletion of fossil fuel energy, as the worldwide fossil oil reserves will be exhausted in shorter than 30 years due to the quick development of anthropogenic activities and overconsumption (Abomohra et al, 2016); – increasing of greenhouse gas emissions (i.e. NOx, CO2 and SOx) that cause global warming and climate problems.Biofuel receives considerable attention because it is a renewable, biodegradable and non-toxic fuel (Mutanda et al, 2010)
The total yield of biodiesel depends on the lipid content of the algal strain and on its growth rate
The economic biomass production of microalgae has to be taken into consideration, so microalgal species with a high lipid content and a high cell growth are used (Lv et al, 2010)
Summary
Contemporary global energy usage is based on utilization of fossil fuels including natural gas, coal and oil. Barbir (2009) concluded that the use of fossil fuels has several problems, such as: – pollution at local, regional and global scales; – risk of complete depletion of fossil fuel energy, as the worldwide fossil oil reserves will be exhausted in shorter than 30 years due to the quick development of anthropogenic activities and overconsumption (Abomohra et al, 2016); – increasing of greenhouse gas emissions (i.e. NOx, CO2 and SOx) that cause global warming and climate problems.Biofuel (fuel derived from biomass) receives considerable attention because it is a renewable, biodegradable and non-toxic fuel (Mutanda et al, 2010). Barbir (2009) concluded that the use of fossil fuels has several problems, such as: – pollution at local, regional and global scales; – risk of complete depletion of fossil fuel energy, as the worldwide fossil oil reserves will be exhausted in shorter than 30 years due to the quick development of anthropogenic activities and overconsumption (Abomohra et al, 2016); – increasing of greenhouse gas emissions (i.e. NOx, CO2 and SOx) that cause global warming and climate problems. Biodiesel from microalgae is a promising renewable energy that might completely replace the fossil diesel without influencing the human food supply (Chisti, 2008). The total yield of biodiesel depends on the lipid content of the algal strain and on its growth rate. The economic biomass production of microalgae has to be taken into consideration, so microalgal species with a high lipid content and a high cell growth are used (Lv et al, 2010). The economic biomass production of microalgae has to be taken into consideration, so microalgal species with a high lipid content and a high cell growth are used (Lv et al, 2010). Abomohra et al (2013) reported two categories of microalgae for high lipid production: – high lipid content (43%) with low growth rate (30 mg.l-1.d-1), such as Botryococcus braunii, – high growth rate (250 mg.l-1.d-1) with low lipid content (15%) such as Scenedesmus obliquus
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