Electrolytic recovery of chromium salts from tannery wastewater

Characterization of tannery effluent wastewater by proton-induced X-ray emission (PIXE) analysis to investigate their role in water pollution

“…In leather tanning industry, Cr salts are extensively employed as tanning agent, which is a major cause for high influx of Cr to the environmental and water contamination (Sirajuddin et al 2007) due to release of huge amount of TW (Budka et al 2010;Espantaleon et al 2003;Pham et al 2010) and dumping of Cr-based sludge. It is reported that around 40% or the Cr used during tanning is Concentrations are in milligrams per liter.…”

“…Although Cr(III) is considered vital for different physiological events, i.e., metabolism of carbohydrate, protein, and fat but at the same time increased intake of Cr(III) has been reported genotoxic and causes deoxyribonucleic acid (DNA) damage (Sirajuddin et al 2007). Even though Cr(III) is considered less toxic, it is highly soluble and permeable in water (Essahale et al 2010) and easily transported to disposal sites where oxidation of Cr (III) converts it to Cr(VI) (Sirajuddin et al 2007), which is a well-established toxin, mutagen, and carcinogen (Bagchi et al 2002;Fahim et al 2006;Gonzalez-Baro et al 2008). Cr(VI) can easily infiltrate down into the soil and contaminate the underground water, which is in agreement with the findings of this study elaborating the flow of Cr from TW to SW and DW (Tables 2, 3, and 4).…”

Behavior of Cr(VI) removal from wastewater by adsorption onto HCl activated Akadama clay

“…The practical wastewater qualities are very complicated, generally with wide change of pHs (e.g. 4.0-9.0 for tannery wastewater) [25,26], diverse coexisting ions, and organics conditions [26]. To practically employ AC for Cr(VI) removal, it is necessary to modify pristine AC so as to enhance its adsorption capacity and broaden the pH ranges.…”

Enhancement of chromium uptake in tanning using oxazolidine

“…Great deal of work had been carried out on recovery of chromium from the wastewater. Chromium can be removed from the wastewater electrochemically [5,6]. Chromium present in the wastewater can also be removed using activated carbon [7], natural diatomite [8] and green algae [9].…”