amount was too great or small. A high flow rate of 0.333 vvm
might damage microalgae cells because of intense turbulence
(Fig. 4). The same damage was observed after cultivation for
10 days when the aeration rate was still controlled at 0.267 vvm.
It can be seen that the aeration rate needed to change with the
growth process due to the different requirements and endurance
of microalgae to aeration intensity