Fig. 4. Values for (a) pH, (b) redox potential (ORP), and (c) sulfate concentration at different sludge solids concentrations during microbial leaching with Acidithiobacillus thiooxidans MET. Symbols: •, 20 g L^-1; , 50 g L^-1; , 90 g L^-1; , 130 g L^-1.

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