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Effect of initial pH on the flocculating activity of bioflocculant from Bacillus nitratireducens towards Eriochrome Black T (EBT) solution. Experiment composition: 10 mL of EBT (1 g/L) with 390 mL of deionized (D.I), pH adjusted with NaOH (1 M) and/or H2SO4 (0.5 M), 100 mL of nutrient broth containing Bacillus nitratireducens, and 5 mL of CaCl2 solution (10 g/L).
