Abstract
The lead-zinc tailings, a kind of hazardous wastes, containing large amount of heavy metals with high extraction toxicity, which would be released into solution with water, oxygen, microorganism and make the environment contaminated. Sulfide ion and alkaline substance were produced with the growth and anaerobic metabolism of sulphate reducing bacteria, inhibiting the oxidation and release of heavy metal ions from the lead-zinc tailings. Sulphate reducing bacteria attached on the calcined activated carbon while growing in the nutrient solution, which could be used to decline heavy metal ions as bio-derived material. Inorganic nitrogen source could be used by autotrophic bacteria effectively and was negative for the sulphate reducing bacteria to deposit toxic elements in the solution.
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