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Special properties and various applications of Spirulina species have led to the growing focus of biotechnology to cost-effective cultivation. Open ponds used in the most commercial purposes have many disadvantages such as risk of contamination, lack of light penetration, inefficient mixing and low productivity. In this study, an innovative reactor was designed and manufactured. In order to control some environmental conditions for a limited amount of an open pond volume, a controllable area was utilized. The conventional pumping system was replaced by a new elevator system to reduce the possible damages to the fragile cells. The considerations in the structure of baffles and aeration contributed to a better mixing system. The effect of factors including Circulation Cycle (Cir. Cyc.), Control Volume (Con.Vol.) and Irradiance Intensity (Irr. Int.) in units of hours, percentage and lux, respectively, on the quantity of biomass (Specific Growth Rate (SGR, day) and fifth and seventh day dry weight (g/L)) were evaluated using RSM-CCD. The maximum biomass dry weight (0.915 g/L) was achieved in longest circulation cycle (12 hours). The optimal irradiance intensity to achieve the highest biomass was 8700 Lux. According to the results, it is possible to increase the productivity and enhance the culture dry weight by controlling a limited amount of ponds volume (i.e. 20%), considering the economic demands. The results obtained can provide the context for the improvement of the overall efficiency.

The innovative engineered photobioreactor to optimize the amount of microalgae Spirulina biomass