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Energy efficient technology for enhanced growth and lipid production in Chlamydomonas reinhardtii through additional reflector coated LED photo-bioreactor

K.V., Ajayan, K., Anjula, A.P., Syamasurya, C.C., Harilal
Biochemical engineering journal 2019 v.144 pp. 81-88
Chlamydomonas reinhardtii, Fourier transform infrared spectroscopy, algae, algae culture, energy efficiency, fluorescent lamps, green light, light intensity, lipid content, lipids, photobioreactors, pigments, specific growth rate
Silver tinted multi-folded reflector sheet was additionally used in the newly designed LED-PBR setup to study the growth performances and resultant lipid production in Chlamydomonas reinhardtii. The experiment was also carried out to compare the algal growth under various LED light qualities with a white fluorescent lamp (FLs). The synergistic effect of the direct and reflected light provided more efficiency and light penetration that improved the cell concentration (77.5 × 106 cells mL−1), specific growth rate (0.514 d−1), total pigments (12.876 ± 0.673 mg L−1) and lipid content (39.4%) of C. reinhardtii under blue illumination than FLs. Interestingly, green light exhibited remarkable changes in lipid content (27.9%) on the 10 d of cultivation than white, red and FLs. Nile red analysis of neutral accumulation and FTIR analysis of fatty acid contents of C. reinhardtii under different light condition significantly varied. This modified RC-PBR setup can be utilized to increase the light intensity in algal culture and thereby minimize energy consumption and culture duration compared to FLs.