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1 Physicochemical Problems of Mineral Processing

1 2020

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Application of biological method for removing selected heavy metals from sewage sludge

Willner Joanna, Fornalczyk Agnieszka

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 2

387--395

The aim of the study was to evaluate the application of bioleaching technique to reduce content of selected heavy metals (Zn, Cu) in sewage sludge, and hence to indicate possibilities for metals recovery from this type of waste. Bioleaching experiments were carried out with mixed bacteria Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, using leaching media: ferrous sulfate with different concentrations of Fe2+ (2 g/dm3 and 9 g/dm3) and sulfuric acid (VI). Dynamics of the increase in zinc concentration in biological systems was almost identical for both 9 g Fe2+/dm3 and 2 g Fe2+/dm3 in samples. However, higher values of Cu concentration were achieved using a medium with iron(II) salt 9 g/dm3 than in a 2 g/dm3 solution. Bioleaching with 9 g Fe2+/dm3 allowed for a nearly 20-fold reduction of zinc content and a 2-fold reduction in copper content in sewage sludge. Using 9 g/dm3 ferrous sulfate bioleaching could dissolve 94.8% Zn and 58.9%, whereas chemical leaching dissolved 47.3% Zn and 4.2% Cu.