Fig. 1. Panel A – effect of flocculant dose (F/X ratio, g of flocculant g of dry biomass−1) on the harvesting efficiency of Chlorella sp. FC2: (A1) FeSO4, (A2) FeCl3, (A3) Ca(OH)2, and (A4) KAl(SO4)2. Panel B–effect of biomass concentration in the culture broth on the harvesting efficiency of Chlorella sp. FC2: (B1) FeSO4 and (B2) FeCl3. In Panel A, all experiments were conducted with an initial biomass concentration of 0.25 g L−1. In Panel B, F/X ratios of 2.5 and 3 were used for FeSO4 and FeCl3, respectively. All experiments were conducted in triplicate and the data were expressed as mean ± standard error. The letters on the bar graphs represent the significant differences in the harvesting efficiencies obtained from harvesting microalgal biomass using different flocculants with different F/X ratios, and the biomass concentration was analyzed using one-way analysis of variance based on the Tukey's method. Harvesting efficiencies that do not share a common letter are significantly different.
