Fig. 5
a Effects of G22 bioflocculant dosage on the removal of different concentration dye solutions. Microscopic view of CBBR-250 dye before (b) and after (c, d) bioflocculation. Different dosages of bioflocculants (25–500 mg L−1) were added to 40 mL of each dye solution at the concentrations of 25, 50 and 100 mg L−1 with 1 mL of 10% CaCl2 solution. Values represent mean ± SDs (n = 4)