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A comprehensive study on the effect of light quality imparted by light-emitting diodes (LEDs) on the physiological and biochemical properties of the microalgal consortia of Chlorella variabilis and Scenedesmus obliquus cultivated in dairy wastewater

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Abstract

The effect of light wavelengths on the physiological, biochemical and lutein content of the microalgal consortia Chlorella variabilis and Scenedesmus obliquus was evaluated using different light sources. Among different light treatments, cool-white fluorescent light produced the highest biomass of 673 mg L−1 with a specific growth rate of 0.75 day−1 followed by blue (500 mg L−1; 0.73 day−1). The chlorophyll content was enhanced under blue light (10.7 mg L−1) followed by cool fluorescent light (9.3 mg L−1), whereas the lutein productivity was enhanced under cool fluorescent light (7.22 mg g−1). Protein content of the microalgal consortia was enhanced under all light treatments with the highest protein accumulation under cool-white fluorescent light (~56% of dry mass) closely followed by amber light (52% of dry mass), whereas the carbohydrate content was higher under amber light (~35% of dry mass). The results revealed that the consortia could grow well on diluted dairy wastewater thereby reducing the cost of algal production when compared with the use of inorganic media and a two-phase culture process utilizing cool fluorescent and amber light could be employed for maximizing algal biomass and nutrient composition with enhanced lutein production. The study also emphasizes on the economic efficiency of LED lights in terms of biomass produced based on the modest electricity consumed and the importance of using amber light for cultivating microalgae for its nutrient content which has seldom been studied.

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Acknowledgements

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada for financial support.

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Authors and Affiliations

  1. Faculty of Agricultural and Environmental Sciences, Department of Bioresource Engineering, 21111 Rue Lakeshore, Sainte-Anne-de-Bellevue, QC, H9X3V9, Canada

    Bhalamurugan Gatamaneni Loganathan, Valerie Orsat, Mark Lefsrud & Bo Sen Wu

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  1. Bhalamurugan Gatamaneni Loganathan
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  2. Valerie Orsat
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  3. Mark Lefsrud
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  4. Bo Sen Wu
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Correspondence to Bhalamurugan Gatamaneni Loganathan.

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Gatamaneni Loganathan, B., Orsat, V., Lefsrud, M. et al. A comprehensive study on the effect of light quality imparted by light-emitting diodes (LEDs) on the physiological and biochemical properties of the microalgal consortia of Chlorella variabilis and Scenedesmus obliquus cultivated in dairy wastewater. Bioprocess Biosyst Eng 43, 1445–1455 (2020). https://doi.org/10.1007/s00449-020-02338-0

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