No abstract

Study for investigated the optimum photoperiod from blue LED light for the growth of Chlorella vulgaris in culture tank. Photoperiods from blue LED Light (Light/Dark) were set up at 24:0, 16:8 and 12:12 h. The initial number of C. vulgaris cells was 1.6 x 105 ± 0.12 cells mL-1. Culture medium was using commercially available fertilizers. After 17 days of cultivation, the results showed that the 24:0 h photoperiod had better growth of algae than 16:8 and 12:12 h, with maximum number of cells of 1.64 x 107 ± 0.23 cells mL-1 specific growth rate (SGR) was 0.17 ± 0.05, -0.06 ± 0.11 and -0.19 ± 0.1% day-1 with statistically significant differences (P < 0.05) in day 5 of cultivation. The stationary phase continued up to day 3 of cultivation, between the treatment. The optimum temperature for growth ranged from 35.5–38.5°C. The results showed that blue LED lighting at 24:0 h is the optimum photoperiod for cultivation of C. vulgaris. Keywords: Photobioreactor tank, Photoperiod, Blue LED light, Chlorella vulgaris, Growth rate