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An unconventional two-stage cultivation strategy to increase the lipid content and enhance the fatty acid profile on Chlorella minutissima biomass cultivated in a novel internal light integrated photobioreactor aiming at biodiesel production

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  • Amaral, Mateus S.
  • Loures, Carla C.A.
  • Pedro, Guilherme A.
  • Reis, Cristiano E.R.
  • De Castro, Heizir F.
  • Naves, Fabiano L.
  • Silva, Messias B.
  • Prata, Arnaldo M.R.

Abstract

Biodiesel quality is dependent upon the fatty acids distribution of the raw material used in the trans/esterification reactions. While microalgae cells are regarded as potential oil suppliers for the biodiesel production chain, a common criticism is related to the low lipid productivities and often to a poor fatty acid distribution. In the present work we propose to submit microalgal cultivation to a second stage with nutritional stress by a simple addition of a 70% nitrate source depleted medium at the beginning of stationary phase, without harvesting cells, saving time and water. Chlorella minutissima was cultivated in a novel unconventional photobioreactor, named Internally Illuminated Integrated Photobioreactor (ILI-PBR), to verify the efficiency of the proposed strategy. Biomass concentration, lipid content and volumetric lipids productivity increased 24.9%, 120.7% and 55.6%, respectively, from Stage 1 to Stage 2, when ILI-PBR was illuminated by constant blue LED and 0.5 vvm of aeration. The fatty acid profiles, evaluated in terms of LED illumination (white, red and blue), showed a predominance of palmitic acid in all cases (59.49%, 57.28% and 46.51%, respectively), which allowed to enhance some biodiesel properties such as cetane number, cold filter plugging point, density and kinematic viscosity, according to international specifications.

Suggested Citation

  • Amaral, Mateus S. & Loures, Carla C.A. & Pedro, Guilherme A. & Reis, Cristiano E.R. & De Castro, Heizir F. & Naves, Fabiano L. & Silva, Messias B. & Prata, Arnaldo M.R., 2020. "An unconventional two-stage cultivation strategy to increase the lipid content and enhance the fatty acid profile on Chlorella minutissima biomass cultivated in a novel internal light integrated photo," Renewable Energy, Elsevier, vol. 156(C), pages 591-601.
    • Handle: RePEc:eee:renene:v:156:y:2020:i:c:p:591-601
    DOI: 10.1016/j.renene.2020.04.084
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    1. Brennan, Liam & Owende, Philip, 2010. "Biofuels from microalgae--A review of technologies for production, processing, and extractions of biofuels and co-products," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 557-577, February.
    2. Huang, GuanHua & Chen, Feng & Wei, Dong & Zhang, XueWu & Chen, Gu, 2010. "Biodiesel production by microalgal biotechnology," Applied Energy, Elsevier, vol. 87(1), pages 38-46, January.
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    1. Vieira de Mendonça, Henrique & Assemany, Paula & Abreu, Mariana & Couto, Eduardo & Maciel, Alyne Martins & Duarte, Renata Lopes & Barbosa dos Santos, Marcela Granato & Reis, Alberto, 2021. "Microalgae in a global world: New solutions for old problems?," Renewable Energy, Elsevier, vol. 165(P1), pages 842-862.

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