Abstract
The process in this study was conducted on removal of chromium(III) in a solution simulating a typical spent chrome tanning bath by the resin having matrix of styrene-divinylbenzene-based macroporous sulphonate, Amberjet 1200Na. The column experiments were carried out with the bed volumes of the resin as 751 mL and 1016 mL for different installation systems of the laboratory-scale pilot plant. The feeding solutions in the bed volumes of 200 and 190 were used for each installation system. The regeneration behaviour of the resin was determined by using reverse regeneration procedure with the solution of hydrogen peroxide in alkaline. The regeneration kinetics of the exhausted resin was examined with a range of the solutions having different concentration series of the alkaline hydrogen peroxide. The solutions of the basic chromium sulphate were recycled for each installation system following the regeneration cycles. The chromium ions in effluent were quantitatively eluted, and satisfactory removal of chromium(III) and recovery of chromium(VI) were achieved.
Highlights
Tannery industry plays an important role with respect to environmental pollution due to the disposal of large volumes of solutions of tanning baths
The ion exchange process is based on a strong acid cation exchanger resin, Amberjet 1200Na, for setting exhaustionregeneration behaviour of the resin
The chromium(III) species have an efficient displacement with oxidation of trivalent to hexavalent trivalent chromium has a strong preference to resin
Summary
Tannery industry plays an important role with respect to environmental pollution due to the disposal of large volumes of solutions of tanning baths. The discharge of chromium rich tannery effluent is a serious threat for environment with high concentrations of organic and inorganic components that they create risk to human health and environmental aspects [1]. The chromium(III) compounds are mainly toxic components of tannery wastewater, and they are used in various industries such as metallurgy, production of pigments, electroplating, and leather tanning [3] by applications for conservation/stabilisation of proteins of animal hides. Tannery wastewaters contain large quantities of chromium; a major potential contributor has existed for chromium pollution in the environment. The chromium is relatively stable and slowly oxidised to the much more toxic hexavalent chromium. Elimination of hexavalent chromium has gained much more interest
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