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The relationship between bacterial adsorption and leaching of copper from copper-containing furnace dust has been investigated in the culture systems of T. ferrooxidans (Thiobacillus ferrooxidans), T. thiooxidans (Thiobacillus thiooxidans) and their mixture. Maximum adsorption amounts of T. ferrooxidans and T. thiooxidans were 1.39 x 1011 cells/g and 1.08 x 10 11 , respectively while maximum adsorption amount of mixed culture was 2.06 × 10 11 cells/g which is close to the sum of that of each bacterial component. These indicate that the two bacterial species have almost independent preferential adsorption sites on furnace dust except ca. 17% of competitive sites. However, the efficiency of leaching was not linearly related to the ratio of adsorption in three different systems even though it was increased in parallel with the bacterial adsorption within the same bacterial system.

Leaching of Copper from Furnace Dust by Pure and Mixed Culture of Thiobacillus ferrooxidans and Thiobacillus thiooxidans