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KMID : 1094720140190010150
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Biotechnology and Bioprocess Engineering
2014 Volume.19 No. 1 p.150 ~ p.158
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Energy-efficient cultivation of Chlamydomonas reinhardtii for lipid accumulation under flashing illumination conditions
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Kim Chul-Woong
Moon Myoung-Hoon
Park Won-Kun
Yoo Gur-Song
Choi Yoon-E
Yang Ji-Won
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Abstract
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Microalgal cultivation has been limited by the efficiency and costs associated with providing light energy, the most expensive and essential element needed for microalgal growth to a culture, particularly to cultures grown in a photo bioreactor (PBR). This study examined the economic benefits of using flashing illumination conditions in the context of microalgal cultivation. Chlamydomonas reinhardtii was cultivated under various conditions, including various inoculum sizes, light intensities, and durations of the light and dark periods. Our results showed that the highest microalgal growth efficiencies could be obtained using a large inoculum size under high intensity illumination accompanied by a 1:1 ratio of light and dark periods. The duration of the flashing light period was further optimized; permitting light energy savings of 62.5% of the light energy expended under continuous illumination conditions without reducing the biomass or lipid productivity. This study provides a more economical approach to cultivating C. reinhardtii via optimized flashing illumination without sacrificing microalgal growth or lipid content.
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KEYWORD
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microalgae, Chlamydomonas reinhardtii, economical feasibility, flashing illumination, photobioreactor, biodiesel
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