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  Referencia 10321
Título: Recuperación selectiva de cromo, cobre, niquel y cinc a partir de soluciones ácidas mediante procesos respetuosos con el medio ambiente
Título original: Selective recovery of chromium, copper, nickel, and zinc from an acid solution using an environmentally friendly process
Autor: Manuela D. Machado, Eduardo V. Soares and Helena M. V. M. Soares
Resumen: 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.
Idioma: Inglés     País: Portugal     ISBN / ISSN: 0944-1344     Año: 2011
Tipo: Artículo
Área: Medioambiente > Tratamiento y reciclaje de aguas
Entidad: Bioengineering Laboratory, Chemical Engineering Department, Superior Institute of Engineering from Porto Polytechnic Institute, Porto // REQUIMTE-Department of Chemical Engineering, Faculty of Engineering of Porto University, Rua Dr Roberto Frias, s/n, 4200–465 Porto// IBB-Institute for Biotechnology and Bioengineering, Centre for Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710–057 Braga
Fuente: Environmental Science and Pollution Research
Localización en fuente: Volume 18, Number 8, 1279-1285, SEP 1
Descriptores: Recuperación selectiva; disolución de metales; digestión ácida; precipitación química, electrolisis, metales pesados, reciclaje, Chemical precipitation – Electrolysis – Heavy metals – Recycling – Selective recovery – Chemical speciation
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