Chromium

1 - 10 of 11 results

Electrical conductivity of a ﬂexible resin loaded with Cr (III) ions Electrical conductivity of flexible strongly acidic resin loaded with Cr (III) was investigated with an impedance spectroscopy method. The purpose of the work was to estimate the influence of hydrostatic pressure drop on the conductivity of the ion-exchanger bed, which had been compacted previously. Desalination 241 (2009)
Chromium(VI) removal from aqueous solution by untreated rubber wood sawdust The ability of untreated local rubber wood sawdust (RWS) to remove Cr(VI) was carried out under a bench-scale shaking condition by varying parameters such as initial Cr(VI) concentrations, adsorbent dosage, pH, temperature and eluting agent. Complete Cr(VI) removal was achieved at pH less than 2, in Desalination 244 (2009)
Sorption of chromium (III) from aqueous solution using bentonitic clay A local clay from Jebel Chakir (northwest of Tunis, Tunisia, North Africa) has been characterized. The mineralogical and chemical compositions of the materials were determined by X-ray diffraction (XRD), infrared spectroscopy (IR) and by the inductively coupled plasma technique (ICP). The cation exc Desalination 248 (2009)
Adsorption of Cd(II), Cr(III) and Mn(II) on natural sepiolite Heavy metals such as cadmium, chromium and manganese are toxic priority pollutants that commonly interfere with the beneficial use of wastewater for irrigation and industrial applications. The sorption of cadmium, chromium and manganese from aqueous solutions onto natural sepiolite has been studied. Desalination 244 (2009)
Effect of pH on rejection of hexavalent chromium by nanofiltration Removal of hexavalent chromium (Cr+6) was carried out with different nanofiltration (NF) membranes for varying concentration and pH of the membrane feed solution. Two membranes were used for this investigation: one high rejection membrane (NFI) and the other a low rejection membrane (NFII). The perc Desalination 219 (2008)
Nanofiltration process applied to the tannery solutions We propose in this study the effectiveness of an organic membrane Nanomax50 charged negatively on complex solution tanneries. Our choice was made on the solutions of tanning and liming of the tannery tawing of Rouïba/Algiers because of the nature of the substances which they contain, namely chromium Desalination 200 (2006)
Simultaneous removal of phenols and Cr3+ using micellar-enhanced ultrafiltration process The removal of phenol, p-cresol, xylenol and Cr3+ ions in simultaneous micellar-enhanced ultrafiltration process was examined. A cationic (CTAB) and anionic surfactant are selected as molecules that are able to create micelles. The rejection coefficients for solutes and surfactants were determined e Desalination 191 (2006)
Pilot plant investigation on petrochemical wastewater treatment for the removal of copper and chromium with the objective of reuse There has been great demand for development of technologies that remove toxic heavy metal ions from wastewater. Chemical precipitation operation is known to remove heavy metal ions from water. In this study applicability of alkaline reagents such as Ca(OH)2 (lime) and NaOH (caustic soda) in removing Desalination 171 (2004)
Purification–concentration process. Studies on the transport mechanism of a chromium (VI)–sulfuric acid– tri-n-octylamine (TOA)–ammonium carbonate system A combined system has been devised with a liquid–liquid extraction–re-extraction reactor where the extraction compartment and the re-extraction compartment are put in contact with one another through the organic phase composed of an extractant and a diluent. We have applied this process to a system Desalination 167 (2004)
Treatment of the tannery effluents from a plant near Algiers by nanofiltration (NF): experimental results and modeling The treatment of a rejection of tannery effluent was carried out on an organic nanofiltration membrane. The rejection was recovered from a leather manufacturing plant in the area of Algiers (Rouiba). The effluent of the bath of tanning and liming charged with chromium ions was the subject of this st Desalination 165 (2004)

Electrical conductivity of a ﬂexible resin loaded with Cr (III) ions

Electrical conductivity of flexible strongly acidic resin loaded with Cr (III) was investigated with an impedance spectroscopy method. The purpose of the work was to estimate the influence of hydrostatic pressure drop on the conductivity of the ion-exchanger bed, which had been compacted previously.

Desalination 241 (2009)

Chromium(VI) removal from aqueous solution by untreated rubber wood sawdust

The ability of untreated local rubber wood sawdust (RWS) to remove Cr(VI) was carried out under a bench-scale shaking condition by varying parameters such as initial Cr(VI) concentrations, adsorbent dosage, pH, temperature and eluting agent. Complete Cr(VI) removal was achieved at pH less than 2, in

Desalination 244 (2009)

Sorption of chromium (III) from aqueous solution using bentonitic clay

A local clay from Jebel Chakir (northwest of Tunis, Tunisia, North Africa) has been characterized. The mineralogical and chemical compositions of the materials were determined by X-ray diffraction (XRD), infrared spectroscopy (IR) and by the inductively coupled plasma technique (ICP). The cation exc

Desalination 248 (2009)

Adsorption of Cd(II), Cr(III) and Mn(II) on natural sepiolite

Heavy metals such as cadmium, chromium and manganese are toxic priority pollutants that commonly interfere with the beneficial use of wastewater for irrigation and industrial applications. The sorption of cadmium, chromium and manganese from aqueous solutions onto natural sepiolite has been studied.

Desalination 244 (2009)

Effect of pH on rejection of hexavalent chromium by nanofiltration

Removal of hexavalent chromium (Cr+6) was carried out with different nanofiltration (NF) membranes for varying concentration and pH of the membrane feed solution. Two membranes were used for this investigation: one high rejection membrane (NFI) and the other a low rejection membrane (NFII). The perc

Desalination 219 (2008)

Nanofiltration process applied to the tannery solutions

We propose in this study the effectiveness of an organic membrane Nanomax50 charged negatively on complex solution tanneries. Our choice was made on the solutions of tanning and liming of the tannery tawing of Rouïba/Algiers because of the nature of the substances which they contain, namely chromium

Desalination 200 (2006)

Simultaneous removal of phenols and Cr3+ using micellar-enhanced ultrafiltration process

The removal of phenol, p-cresol, xylenol and Cr3+ ions in simultaneous micellar-enhanced ultrafiltration process was examined. A cationic (CTAB) and anionic surfactant are selected as molecules that are able to create micelles. The rejection coefficients for solutes and surfactants were determined e

Desalination 191 (2006)

Pilot plant investigation on petrochemical wastewater treatment for the removal of copper and chromium with the objective of reuse

There has been great demand for development of technologies that remove toxic heavy metal ions from wastewater. Chemical precipitation operation is known to remove heavy metal ions from water. In this study applicability of alkaline reagents such as Ca(OH)2 (lime) and NaOH (caustic soda) in removing

Desalination 171 (2004)

Purification–concentration process. Studies on the transport mechanism of a chromium (VI)–sulfuric acid– tri-n-octylamine (TOA)–ammonium carbonate system

A combined system has been devised with a liquid–liquid extraction–re-extraction reactor where the extraction compartment and the re-extraction compartment are put in contact with one another through the organic phase composed of an extractant and a diluent. We have applied this process to a system

Desalination 167 (2004)

Treatment of the tannery effluents from a plant near Algiers by nanofiltration (NF): experimental results and modeling

The treatment of a rejection of tannery effluent was carried out on an organic nanofiltration membrane. The rejection was recovered from a leather manufacturing plant in the area of Algiers (Rouiba). The effluent of the bath of tanning and liming charged with chromium ions was the subject of this st

Desalination 165 (2004)

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