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Fig. 5 | Biotechnology for Biofuels

Fig. 5

From: Pre-concentration of microalga Euglena gracilis by alkalescent pH treatment and flocculation mechanism of Ca3(PO4)2, Mg3(PO4)2, and derivatives

Fig. 5

The visual quantification of precipitates and turbidity were determined in the PEM medium by pH 8.5 treatment. a Control group under fresh PEM medium at pH 8.5; PEM without b Ca2+, c Mg2+, and d both Ca2+ and Mg2+; e turbidity was determined under different conditions; PEM represents control group, fresh PEM medium; PEM-Mg2+ represents PEM without MgSO4·7H2O; PEM-Ca2+ represents PEM without CaCl2·2H2O; PEM-Mg2+,-Ca2+ represents PEM without MgSO4·7H2O, CaCl2·2H2O; * and ** represent p < 0.05, p < 0.01, respectively. The values represent mean ± S.D. n = 3

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