TY - JOUR
T1 - Effect of solvent type on removal and recovery of hexavalent chromium from industrial wastewaters
AU - Hossain, Md M.
N1 - Funding Information:
This work was financially supported by the Research Affairs at the UAE University under a Contract No. 04-02-7-11/08. The author would like to acknowledge the assistance of Hassan Kamal Ahmed of the Department of Chemical & Petroleum Engineering, in conducting the experiments.
PY - 2014/5
Y1 - 2014/5
N2 - Metals, especially chromium exists in a wide range of concentrations in natural water and wastewaters from various industrial operations. Reactive liquid extraction can be used for removing chromium. In this report, equilibrium experiments are presented on the removal of hexavalent chromium (Cr(VI)) using Aliquat 336 in various non-traditional solvents. The solvents are sunflower oil (fresh and recycled) and lubricating oil (fresh and recycled). The results are presented for the removal of Cr(VI) from aqueous solutions in the concentration range 0.5-500 ppm using Aliquat 336 (in the range 1.0-20% (v/v)). It is shown that sunflower oil and lubricating oil, both in the fresh and recycled forms, are able to remove Cr(VI) from ground waters and industrial wastewaters at their natural pH (range 6-8). These solvents gave satisfactory percentage extractions, producing water that can be recycled and they also offer advantages from health and safety, and environmental points of view. The results of the re-extraction process using KCl, K2CO3 and seawater are also presented. Seawater at its natural pH of 8 has shown potential for re-extraction. The findings have been applied to remove Cr(VI) from complex industrial wastewaters. The results provide good guidelines to the development of Cr(VI) removal and recovery processes using renewable, biodegradable, safe and cheap solvent systems demonstrated in this paper.
AB - Metals, especially chromium exists in a wide range of concentrations in natural water and wastewaters from various industrial operations. Reactive liquid extraction can be used for removing chromium. In this report, equilibrium experiments are presented on the removal of hexavalent chromium (Cr(VI)) using Aliquat 336 in various non-traditional solvents. The solvents are sunflower oil (fresh and recycled) and lubricating oil (fresh and recycled). The results are presented for the removal of Cr(VI) from aqueous solutions in the concentration range 0.5-500 ppm using Aliquat 336 (in the range 1.0-20% (v/v)). It is shown that sunflower oil and lubricating oil, both in the fresh and recycled forms, are able to remove Cr(VI) from ground waters and industrial wastewaters at their natural pH (range 6-8). These solvents gave satisfactory percentage extractions, producing water that can be recycled and they also offer advantages from health and safety, and environmental points of view. The results of the re-extraction process using KCl, K2CO3 and seawater are also presented. Seawater at its natural pH of 8 has shown potential for re-extraction. The findings have been applied to remove Cr(VI) from complex industrial wastewaters. The results provide good guidelines to the development of Cr(VI) removal and recovery processes using renewable, biodegradable, safe and cheap solvent systems demonstrated in this paper.
KW - Chromium
KW - Recovery
KW - Removal
KW - Seawater
KW - Sunflower oil
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U2 - 10.1080/19443994.2013.797148
DO - 10.1080/19443994.2013.797148
M3 - Article
AN - SCOPUS:84899720570
SN - 1944-3994
VL - 52
SP - 3147
EP - 3158
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
IS - 16-18
ER -