Sound Wave Exposure as a Strategy for Improving the Tubular Photobioreactor for Cultivating Synechococcus HS-9 as Biofuel Feedstock under Different Photoperiods

Yosua Adi Santoso, Rubiantin Mesha Nauli Tambunan, Santoso Soekirno, Nasruddin Nasruddin, Nining Betawati Prihantini
2020 International Journal of Technology  
This study aimed to evaluate the effect of sound wave exposure in different photoperiods on Synechococcus HS-9 cell density and lipid content using tubular photobioreactors (PBRs). In this study, nine PBRs were used: three PBRs were exposed to a sine wave of 279.9 Hz for three hours during the day (A), three PBRs were exposed to a sine wave of 279.9 Hz for three hours during the night (B), and three PBRs remained unexposed to any sound wave to serve as a control (K). All PBRs were studied for
more » ... were studied for 18 days. The results showed that the highest average cell densities of Synechococcus HS-9 in PBR A, B, and K respectively were 8.883×10 5 cells/mL, 7.242×10 5 cells/mL, and 6.175×10 5 cells/mL. The highest lipid percentage, which was 17%, was observed in PBR A; the percentage in PBR B was 16%, and in PBR K, 7%. However, Synechococcus HS-9 in PBR B showed a higher growth rate compared to PBR A and PBR K. Sound waves could have increased cell activity and metabolism which led to the increase in cell densities and lipid percentages in Synechococcus HS-9. The photoperiodic differences might have resulted in a lower photosynthetic rate and cell metabolism, but the sound wave could have helped promote the growth of Synechococcus HS-9 despite the lower photosynthetic rate.
doi:10.14716/ijtech.v11i7.4459 fatcat:3x4oju7yqvgydmauzhscaw6vw4