Cell biomass
The three microalgal species were incubated until a similar biomass was produced. While Botryococcus sp. was cultured for 14 days, C. vulgaris and Scenedesmus sp. were only incubated for 7 days (Table 1). The C. vulgaris showed the highest biomass productivity at 74.2 mg L−1 d−1 on day 7, when compared to the other species. The biomass productivity of Scenedesmus sp. was similar to that of C. vulgaris. However, the biomass productivity of Botryococcus sp. was only 35.7 mg L−1 d−1 which was about half of that of C. vulgaris and Scenedesmus sp.