It may be concluded that aeration of CO2 is significantly superior due to the differences of
cultivation conditions. During cultivation under the CO2 flow, the bubbles and turbulent flow formed by aeration are helpful to enhance CO2-culture medium contact and diffusion, and employ a carbon source for photosynthesis (Zhao B. et. al. 2011). But excessive turbulent flow conditions may affect the normal growth of microalgae biomass due to abnormal metabolism of cells.