Removal and recovery of Cr(VI) from polluted ground waters: a comparative study of ion-exchange technologies.
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.
Galán
Berta
B
Dpto. de Ingeniería Química y Química Inorgánica, ETSIIyT, Universidad de Cantabria, Avenida de los Castros, 39005 Santander, Spain. galanb@unican.es
Castañeda
David
D
Ortiz
Inmaculada
I
D000837:Anion Exchange Resins / Q000737:chemistry; D002274:Carcinogens, Environmental / Q000737:chemistry / Q000302:isolation & purification*; D002857:Chromium / Q000302:isolation & purification* / Q000378:metabolism; D007474:Ion Exchange; D007700:Kinetics; D008567:Membranes, Artificial; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism; D018508:Water Purification / Q000379:methods*
D000837:Anion Exchange Resins; D002274:Carcinogens, Environmental; D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; D014867:Water; D002857:Chromium; C074702:chromium hexavalent ion