| 초록 |
Some microalgae are known to accumulate large amount of lipids, which can be converted to biodiesel. Lipid accumulation in microalgae is often a result of arrested growth due to certain conditions. In this experiment, three microalgae, Tetraselmis sp. KCTC12429BP, Duneliella tertiolecta LB999, Nannochloropsis oculata K-1281 were compared for lipid productivity. Three microalgae were cultivated in bubble columns with 400 mL of MBL with f/2-Si medium. 2% CO2 gas was supplied at 0.1 vvm with light intensity of 80±10 uE/m2/sec. The highest FAME contents were 30.8%, 9.6%, and 6.1% for N. oculata, Tetraselmis sp., and D. tertiolecta, respectively. However, the lipid productivity was rather similar as 13 mg/L/day and 19 mg/L/day in N. oculata and Tetraselmis sp. Although the lipid content was much higher in N. oculata, the difference in biomass productivity resulted in similar lipid productivity. From the view of integrated biorefinery, Tetraselmis biomass is more attractive feedstock than N. oculata or D. tertiolecta biomass due to larger biomass provided. This study suggests that when selecting the microalgal species for large-scale cultivation, high biomass productivity should be considered especially as well as maximum lipid content. |
