SPIRULINA (Spirulina platensis) PRODUCTION IN DIFFERENT PHOTOBIOREACTORS ON ROOFTOP

An experiment was accomplished on the rooftop of Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to screen some Photobioreactors for finding out more economically convenient and easily available one for spirulina production in Bangladesh. Four types of photobioreactors, viz., Rectangular shaped 5L photobioreactor (PBR₁), Cuboidal shaped 3L Photobioreactor (PBR₂), Cylindrical shaped 15L Photobioreactor (PBR₃), Rectangular shaped 15L Photobioreactor (PBR₄) were used in this experiment following Completely Randomized Design (CRD) with three replications. Fifteen days of production was carried out in the selected photobioreactors to determine the performance of the PBRs where culture condition were kept the same and data on different growth and yield parameters were taken throughout the experiment to which all the PBRs showed significant variations. Among photobioreactors, growth doubling require (3.41 days), maximum productivity (0.90 gL^-1day^-1) and the highest marketable yield (3.34 kg/kl) were found in PBR₄ while maximum doubling time (10.63 days) with lower productivity (0.40gL^-1day^-1) and minimum marketable yield (1.64 kg/kl) in PBR₂. So, 15L rectangular shaped Photobioreactor will be the promising photobioreactor for spirulina cultivation in Bangladesh.