Removal of Cd and Zn from inorganic industrial waste leachate by ion exchange

Abstract

9This paper presents a study of the removal of Cd and Zn present in the leachate from an inorganic industrial waste landfill using cationic exchange resins (Amberlite 200, 252-C, IR-120, Duolite C-464), a chelating resin, Amberlite IRC 718, and an adsorbent resin, XAD-2. The chelating resin Amberlite IRC 718 presented the higher removal in batch experiments for both metals (93% for Zn and 50% for Cd). Five hundred ten bed volumes of leachate were treated in column experiments using this material, reducing the concentrations of Cd and Zn from 18 mg/dm 3 to 0.1 and 1.0 mg/dm 3 , respectively. Regeneration of the saturated bed was achieved with 11 BV of 2 M HCl.

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

“…Other studies obtained the highest removal percentages with the chelating resin; Zn removal percentages of 93% were achieved with this resin, although lower results were achieved for Cd (50%). This type of resin, based on the iminodiacetate group, is of the weak cationic type and presents a high selectivity for heavy metals such as Cd and Zn versus sodium, calcium and magnesium ions, when working at pH values of between 4 and 8 [131]. Janin et al [130], combining M4195 and IR120 resins in four successive columns, succeeded to recover copper and chromium at 94% and 81%, respectively [130], presenting ion exchange as a suitable solution for heavy metal removal from landfill leachate.…”

Sorption properties of the iminodiacetate ion exchange resin, amberlite IRC‐718, toward divalent metal ions

“…Unless otherwise indicated, all chemicals were obtained from commercial sources and were used as received; the ion exchange resin containing iminodiacetate groups, Amberlite IRC-718, obtained as a sodium salt was purchased from Rohm and Haas, company (USA); bulk density 750 g/L, swelling (%) 30, total exchang capacity 1.35 mequiv/mL, 35 particle size of 16-50 mesh was used without further purification. The following metal ion salts were purchased from Fluka and were also used as received without further purification: Cu(II) acetate, Ni(II) acetate, Zn(II) acetate, and Fe(II) chloride.…”

Equilibrium and kinetics of heavy metal ion exchange

“…Furthermore, it can be as well categorized on the basis of functional groups such as cationic exchange resins, anion exchange resins, and chelating exchange resins (Dorfner, 1991). Depending on the functional groups, ion-exchange resin www.elsevier.com/locate/jcice Journal of the Chinese Institute of Chemical Engineers 38 (2007) [71][72][73][74][75][76][77][78][79][80][81][82][83][84] can deal properly with several heavy metals such as copper, nickel, cobalt, cadmium, zinc, and aluminum (Ersoz et al, 1995;Fernández et al, 2005;Kiefer and Höll, 2001;Kilislioglu and Bilgin, 2003).…”