Effects of light intensity on growth and lipid production in microalgae grown in wastewater

Cultivation of microalgae in wastewater could significantly contribute to wastewater treatment, biodiesel production, and thus the transition to renewable energy. However, more information on effects of environmental factors, including light intensity, on their growth and composition (particularly f...

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Bibliographic Details
Published in:	Biotechnology for biofuels Vol. 13; no. 1; p. 4
Main Authors:	Nzayisenga, Jean Claude, Farge, Xavier, Groll, Sophia Leticia, Sellstedt, Anita
Format:	Journal Article
Language:	English
Published:	England BioMed Central Ltd 07-01-2020 BioMed Central BMC
Subjects:	Acid production Algae Biodiesel Biodiesel fuels Biofuels Biomass Biorefinery Carbohydrates Cell division Chemical properties Composition Cultivation Diesel Environmental effects Environmental factors Fatty acid composition Fatty acids Fourier transforms FTIR Glycerol Growth Infrared analysis Light Light intensity Lipid synthesis Lipids Luminous intensity Methods Microalgae Microbiological synthesis Nitrogen Northern Hemisphere Observations Optical properties Phosphorus Proteins Renewable energy Sewage treatment Spectrometry Wastewater treatment Waterborne diseases Sweden Light intensity Lipids Biorefinery Microalgae Biodiesel FTIR
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Summary:	Cultivation of microalgae in wastewater could significantly contribute to wastewater treatment, biodiesel production, and thus the transition to renewable energy. However, more information on effects of environmental factors, including light intensity, on their growth and composition (particularly fatty acid contents) is required. Therefore, we investigated the biomass and fatty acid production of four microalgal species, isolated in the Northern hemisphere and grown at three light intensities (50, 150 and 300 μE m s ). Increases in light intensities resulted in higher biomass of all four species and, importantly, raised fatty acid contents of both sp. and . Fourier-transform IR spectrometry analysis showed that the increases in fatty acid content were associated with reductions in protein, but not carbohydrate, contents. Assessment of fatty acid composition revealed that increasing light intensity led to higher and lower contents of oleic (18:1) and linolenic (18:3) acids, respectively. The microalgae consumed more than 75% of the nitrogen and phosphorus present in the wastewater used as growth medium. The results show the importance of optimizing light intensities to improve fatty acid production by microalgae and their quality as sources of biodiesel. In addition, increase in fatty acid content is associated with decrease in protein content.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1754-6834 1754-6834
DOI:	10.1186/s13068-019-1646-x