摘要：Harvesting is ultimately an important step on microalgae production since a successful harvesting will increase the performance of the system totally as well as increasing the revenue. Bioflocculation is such type of the harvesting technique that offers high recovery performance, while at the same time it costs less and is more environment friendly. Exopolysaccharide (EPS) is actually the key of the performance. The objective of this research is to observe the performance of EPS produced by the Bacillus subtilis for microalgae harvesting. The bacterial growth medium where the EPS has been produced was induced directly to the microalgae. Two different species of microalgae, which were Nannochloropsis oculata and Botryococcus braunii, were used to compare the influence of microalgae type to the performance. Different concentration of EPS was employed to study how it affects the recovery performance. These various concentrations were 5% v/v, 10% v/v and 15% v/v. The result shows that the highest performance was presented when 5% EPS was induced to both the species, which was about 90%, while the lowest was presented by 15% EPS, which was about 70%. The same trend was applied for initial floc forming time of each treatment.
