A comparative study of alginate beads and an ion-exchange resin for the removal of heavy metals from a metal plating effluent

Silva, Rui M. P.; Manso, João P. H.; Rodrigues, Joaquim Rui; Lagoa, Ricardo

http://hdl.handle.net/10400.8/2350

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Authors

Silva, Rui M. P.

Manso, João P. H.

Rodrigues, Joaquim Rui

Lagoa, Ricardo

Abstract(s)

The capacity of dry protonated calcium alginate beads to sorb metals from an industrial effluent was studied and compared with a commercial ion-exchange resin (Lewatit TP 207). Both sorbents decreased zinc, nickel, iron and calcium concentrations in the effluent, and released sodium during treatment. Alginate beads removed lower amounts of heavy metals than the resin, but exhibited faster uptake kinetics. Zinc desorption from the sorbents was achieved in 30 minutes using 0.1 M HCl or 0.1 M H(2)SO(4). Desorption ratios with these acids varied between 90 and 100% for alginate, and 98 to 100% for the ion-exchange resin. Reusability tests with HCl showed that alginate beads can stand acid desorption and recover binding capacity. Overall, the comparison of dry protonated alginate beads with the resin supports the potential of the biosorbent for the treatment of industrial effluents.

Keywords

Alginate Metal recovery Electroplating effluent Water treatment Ion Exchange Lewatit TP 207 Desorption Biosorption Industrial wastewater Pollution prevention Research Subject Categories::NATURAL SCIENCES::Chemistry::Environmental chemistry Research Subject Categories::TECHNOLOGY::Bioengineering::Biotechnological separation Research Subject Categories::TECHNOLOGY::Chemical engineering Research Subject Categories::TECHNOLOGY::Other technology::Environmental engineering