Fig. 4From: Enhanced biomass productivity of microalgae Nannochloropsis sp. in an airlift photobioreactor using low-frequency flashing light with blue LEDFive treatments of CO2 concentration during aeration fluid consisting of 0.59, 36.07, 71.55, 107.03 and 142.51 ppm for concentration curves of (a) ammonium, (b) nitrite, (c) nitrate, (d) orthophosphate in the culture of Nannochloropsis spBack to article page