Figure 27- pH variation of the culture medium after 11 days of incubation with A.niger under different bauxite residues and concentrations. Values are expressed as ΔpH ( - ). Negative ΔpH values represent a reduction in pH (acidification) relative to the initial medium. Means and confidence intervals (95%) are presented. A) B) Figure 28- P. oxalicum tolerance across the bauxite residue samples: (A) BR-A and BR-B, and (B) BR-C. The red dashed line indicates a tolerance index of 0.5. Asterisks (*) indicate statistically significant differences. Figure 29- pH variation of the culture medium after 18 days of incubation with P. oxalicum under different bauxite residues and concentrations. Values are expressed as ΔpH ( - ). Negative ΔpH values represent a reduction in pH (acidification) relative to the initial medium. Means and confidence intervals (95%) are presented.
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