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Title

Tratamento de efluente de galvanoplastia por meio da tiossorção de cromo e ferro com escamas da pinha da Araucaria angustifolia.

Authors

dos Santos, Fernanda Abreu; Pires, Marçal Jose Rodrigues; Cantelli, Marlize

Abstract

This work aims to test the use of scales from the cones of the Araucaria angusti-folia tree in the removal of chromium and iron encountered in the wastewaters from the galvanoplasty process. A comparison with other treatment methods was also per-formed for compliance with environmental legislation. The cone scales are obtained from "pinhão", which is consumed in the south Brazil. Some parameters were opti-mized for the best performance of metal removal, such as biosorbent particles size and dosage, pH, time of contact and initial metal concentrations. The results were com-pared with adsorption treatment using activated carbon and chemical precipitation with bisulfite. The cone scales are efficient for the removal of chromium(VI) (> 99%), while the iron concentration was 62% lower after 1 hour of the contact with 3 g.L1 of the sorbent (particle size <250 fim). The scales showed to be competitive with the tra-ditional processes, allowing also a more noble use a material that would be discarded.

Subjects

ELECTROMETALLURGY; METAL absorption & adsorption; BRAZILIAN pine; IRON removal (Water purification); CHROMIUM removal (Water purification); PARTICLE size determination; PH effect; ACTIVATED carbon; PRECIPITATION (Chemistry); SULFITES

Publication

Rem: Revista Escola de Minas, 2011, Vol 64, Issue 4, p499

ISSN

0370-4467

Publication type

Academic Journal

DOI

10.1590/S0370-44672011000500016