Integration of ion-exchange and nanofiltration processes for recovering Cr(III) salts from synthetic tannery wastewater

Environmental Technology
Licínio M Gando-FerreiraMargarida M Quina

Abstract

This study aims to investigate the possibility of integrating both ion-exchange (IX) and nanofiltration (NF) processes for the recovery of Cr(III) salts from a synthetic solution prepared with concentrations of Cr(III), [Formula: see text] and Cl(-) in the range of industrial effluents of tanneries. Ion exchange should be used as a pre-treatment for uptaking Cl(-) ions from the effluent, and thereafter the treated solution is fed to an NF unit to recover chromium sulphate salt for reuse in the tanning bath. The strong anionic resin Diaion PA316 was selected for evaluating chloride-sulphate ion-exchange equilibrium, with respect to mass of resin, NaCl concentration, temperature and ratio [Formula: see text]. It was observed that the separation factor, [Formula: see text], depends on the total electrolyte concentration and the ratio [Formula: see text] plays a role as well. Moreover, it was determined that the resin prefers sulphate over chloride since [Formula: see text] is less than 1. The performance of the NF process is dependent on [Formula: see text] and the rejection of Cr(III) may decrease from 90% to 70% as the ratio increases from 0.5 to 2. Regarding the integration of both IX and NF, the feed solution after treatement ...Continue Reading

References

Sep 22, 2001·Journal of Hazardous Materials·S RengarajS H Moon
Sep 29, 2005·Journal of Chromatography. a·Maria J Moreira, Licínio M Ferreira
Mar 6, 2007·Journal of Hazardous Materials·Sofia A CavacoLicínio M Ferreira
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Oct 31, 2008·Talanta·Sevgi Kocaoba, Göksel Akcin
Nov 30, 2010·Journal of Hazardous Materials·P ReligaP Gierycz
Jun 6, 2013·The Science of the Total Environment·Giusy LofranoDerin Orhon

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