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Published on: June 21, 2015
Removal and recovery of Cr(VI) from polluted ground waters: a comparative study of ion-exchange technologies
Berta Galán1, David Castañeda, Inmaculada Ortiz
1Dpto. de Ingeniería Química y Química Inorgánica, ETSIIyT, Universidad de Cantabria, Avenida de los Castros, 39005 Santander, Spain. galanb@unican.es
Abstract:
The focus of this work has been the study of Cr(VI) removal from ground waters and the simultaneous concentration for its reuse using three different technological alternatives: anion-exchange resins, liquid-liquid extraction assisted by hollow fibre membranes and emulsion pertraction. The viability of the considered objectives, i.e., Cr(VI) separation (<0.5 g/m3) and concentration for reuse (>20,000 g/m3) has been checked and a comparative analysis of the three technologies has been performed. Although the flexibility and ease of operation of non-dispersive solvent extraction, anion-exchange resins and emulsion pertraction lead to higher velocities of chromium removal, yet still maintaining similar concentration efficiencies.
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