During the initial 6 days, microalgae cells
grew rapidly except in the case of 0.067 vvm which might lead to
inefficient mixture of light and medium with Chlorellasp. cells.
Before the 11th day, the maximum growth rate was obtained at
the aeration flow of 0.267 vvm during the first 6 days and then it
began to decline slowly until stopping on the 10th day