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Chromium(III) salts recovery process from tannery wastewaters

TitoloChromium(III) salts recovery process from tannery wastewaters
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione1997
AutoriFabiani, Claudio, Ruscio F., Spadoni M., and Pizzichini Massimo
RivistaDesalination
Volume108
Paginazione183 - 191
Data di pubblicazione1997///
Parole chiaveChromium recovery, Microfiltration, Tanning processes, Ultrafiltration
Abstract

Chromium(III) salts are the most widely used chemicals for tanning processes [1], but only 60% of the total chromium salt reacts with the hides. Therefore, about 40% of the chromium amount remains in the solid and liquid wastes (especially spent tanning solutions). The presence of chromium(III) and salts in the sludges of both the wastewater biological treatment plants or the chemical plants for recycling spent tanning liquors, represents an inconvenience for the safe reuse of these sludges and a cost forming factor for their disposal. Among the several proposed methods for chromium recovery [1-6], lime or sodium hydroxide precipitation and filter-pressing of the chromium hydroxide is the usual way to recover chromium salts from spent process solutions or from leaching solutions of residues of hides. However, usually the chromium salts quality must be improved for their reuse in tanning processes [7]. The integration of membranes in the treatment process for chromium recovery reduces the environmental impact, favours the reuse of both the protein residue and the biological plant sludges, reduces the consumption of chemicals and decreases the costs of waste disposal.

Note

Cited By (since 1996): 25Export Date: 21 January 2011Source: Scopus

URLhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0031078389&partnerID=40&md5=5f987f397728fa5eee52053608b5f776
Citation Key949