JEQ -- Ryu et al. 32 (3): 751 Figure IG3

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Fig. 3. Effect of inoculation of Acidithiobacillus thiooxidans MET on pH reduction of sludge solution. Symbols: •, sterilized sludge; ${circ}$ , nonsterilized sludge; ${blacktriangledown}$ , nonsterilized sludge with the inoculation of mixed sulfur-oxidizing bacteria; ${triangledown}$ , nonsterilized sludge with the inoculation of A. thiooxidans MET.