Sustainable Production of Nannochloris atomus Biomass Towards Biodiesel Production

Touria Bounnit, Imen Saadaoui, Rihab Rasheed, Kira Schipper, Maryam Al Muraikhi and Hareb Al Jabri
Additional contact information
Touria Bounnit: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
Imen Saadaoui: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
Rihab Rasheed: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
Kira Schipper: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
Maryam Al Muraikhi: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar
Hareb Al Jabri: Algal Technologies Program, Centre for Sustainable Development, College of Arts and Sciences, Qatar University, Doha P.O. Box 2713, Qatar

Sustainability, 2020, vol. 12, issue 5, 1-21

Abstract: Nannochloris atomus (QUCCCM31) is a local marine microalga showing potential to serve as renewable feedstock for biodiesel production. The investigation of the impact of temperature variation and nitrogen concentrations on the biomass and lipid productivities evidenced that biomass productivity increased with the temperature to reach an optimum of 195 mgL −1 d −1 at 30 °C. Similarly, the lipid content was strongly influenced by the elevation of temperature; indeed, it increased up to ~3 folds when the temperature increased from 20 to 40 °C. When both stresses were combined, triacylglycerols and lipid productivity reached a maximum of 45% and 88 mgL −1 d −1 , respectively at 40 °C. Cultures under high temperatures along with Nitrogen-Depleted (ND) favored the synthesis of Fatty Acids Methyl Ester (FAMEs) suitable for high quality biodiesel production, whereas cultures conducted at low temperature coupled with Nitrogen-Limited (NL) led to a production of polyunsaturated fatty acids (PUFAs). Our results support the feasibility of cultivating the thermotolerant isolate QUCCCM31 year-round to meet the sustainability challenges of algal biomass production by growing under temperature and nitrogen variations. The presence of omega 3 and 9 fatty acids as valuable co-products will help in reducing the total process cost via biorefinery.

Keywords: Nannochloris atomus; temperature variations; N-starvation; lipid productivity; PUFAs; sustainable feedstock; biodiesel (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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