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Advisor(s)
Abstract(s)
Purpose Real electroplating effluents contain multiple
metals. An important point related with the feasibility of
the bioremediation process is linked with the strategy to
recover selectively metals. In this work, a multimetal
solution, obtained after microwave acid digestion of the
ashes resulted from the incineration of Saccharomyces
cerevisiae contaminated biomass, was used to recover
selectively chromium, copper, nickel, and zinc.
Results The acid solution contained 3.8, 0.4, 2.8, and
0.2 g/L of chromium(III), copper, nickel, and zinc,
respectively. The strategy developed consisted of recovering
copper (97.6%), as a metal, by electrolyzing the
solution at a controlled potential. Then, the simultaneous
alkalinization of the solution (pH 14), addition of H2O2,
and heating of the solution led to a complete oxidation of
chromium and nickel recovery (87.9% as a precipitate of
nickel hydroxide). After adjusting the pH of the remaining
solution at pH 10, selective recovery of zinc (82.7% as
zinc hydroxide) and chromium (95.4% as a solution of
cromate) was achieved.
Conclusion The approach, used in the present work,
allowed a selective and efficient recovery of chromium,
copper, nickel, and zinc from an acid solution using a
combined electrochemical and chemical process. The
strategy proposed can be used for the selective recovery
of metals present in an acid digestion solution, which
resulted from the incineration of ashes of biomass used in
the treatment of heavy metals rich industrial effluents.
Description
Keywords
Chemical precipitation Electrolysis Heavy metals Recycling Selective recovery Chemical speciation
Citation
Publisher
Springer Verlag