Investigating Carbon Dioxide Transfer for Intensive Cultures of the Microalga Tetradesmus obliquus
BioEnergy Research - Trang 1-10 - 2023
Tóm tắt
Carbon dioxide (CO2) transfer in the intensive cultivation of microalgae is a crucial process in photobioreactor performance. This study evaluated three operating conditions (bubble size, aeration rate, and CO2 concentration) to improve the growth performance of the microalga Tetradesmus obliquus in a laboratory–scale photobioreactor. Two types of air diffusers were used (glass pipette and a sintered glass diffuser), three aerations rates (0.125, 0.25 and 0.5 vvm), and four CO2–enriched air concentrations (0.04, 0.5, 1.0 and 2.0%) were investigated during the Tetradesmus obliquus cultivations. The results showed that the overall gas-liquid mass transfer coefficient (kLa) CO2 can be raised by increasing the aeration rate and using a sintered glass diffuser; however, CO2 capture efficiency was lower when the highest aeration rates were applied. When the glass diffuser was used at an aeration rate of 0.25 vvm, a kLa CO2 of 11.98 ± 0.6 1/h was provided, in comparison to 4.90 ± 0.19 1/h for the use of pipette at 0.5 vvm (maximum value reached). Similarly, the highest CO2 capture efficiency rate (67.94 ± 3.56%) was found applying an aeration rate of 0.25 vvm. At a CO2 concentration of 1 or 2% the T. obliquus biomass reached approximately 4.3 g/L, values significantly higher (p < 0.05) than the values reported for supplementation of 0.5% (~ 3.9 g/L) and 0.04% (~ 1.5 g/L). In summary, to avoid losses of CO2 to the atmosphere, an addition of 1% CO2 at an aeration rate of 0.25 vvm using a sintered glass diffuser were the optimal conditions to be applied in cylindrical laboratory–scale photobioreactor for T. obliquus growth.
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