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2011-Sustainable Industrial Processing Summit
|Publisher:||Flogen Star OUTREACH|
|ISSN:||2291-1227 (Metals and Materials Processing in a Clean Environment Series)|
This work presents the results of wastewater sludge treatment coming from a dismissed industrial site. Sludge sample is collected from an industrial site and subjected to several processing steps to extract the heavy metals Cu, Ni, Cd and Zn. The distribution of the metal fraction shows that by leaching with sulfuric acid heavy metals (Cu, Ni and Zn) can be extracted from sludge with a high percentage. Cd is present in two metal fractions (exchangeable and reducible fraction). The extractive solution obtained was subjected to an electrodeposition to remove metals. To minimize power consumption, the cathode used was made in the same material as the removed metal. In order to have deposition time as similar as possible, the cathode area used was adapted to the concentration of the respective metal. The removal of each metal was made potentiostatically at different potentials. The deposition rate of the metals was different, Nickel and cadmium show the highest deposition rate, while the zinc shows the lowest. The results show that 99 % of metal reduction was achieved and the solution obtained after electrodeposition contains metals concentrations in agreement with Algerian legislations.