Many methods are available for the separation of liquid mixtures and metal ions. Among them, the foam separation technique holds great promise especially when the concentrations involved is very low. The basis for the separation is surface absorption phenomena. The success of this technique depends on the stability and characteristics of foam. The operation is simple with less maintenance as there are no moving parts. A fundamental study about the selective foam fractionation of Chromium (VI) metal ion in continuous column was carried out with sodium lauryl sulphate (SLS) as foaming agent using synthetic aqueous and industrial effluent containing chromium ion. The effect of air flow rate, liquid pool height, pH, concentration of feed solution and foam height were varied to study the performance on enrichment factor in foam separation and the enrichment ratio. The experiments were carried out to optimize the various parameters for effective separation of Cr (VI) ions. From these studies it has been observed that as the height of the liquid pool increases, the separation factor also increases which is due to the fact that the residence time of bubble in the liquid pool is more. As the concentration of the bulk solution is reduced, the surface tensions increases and in turn the separation factor increases. As the flow rate of air increases from 0.2 to 1.0 LPM, the separation factor decreases. The enrichment ratio is observed to be high when ever the foam is dry. An increase in the feed flow rates resulted in having more available chromium ions leading to increase in the enrichment ratio. The flow rate varied from 2 to 6 LPH. Tannery effluent was used for carrying out these experiments.
|Keywords:||Foam Fractionation, Tannery Effluent, Chromium(VI), Enrichment Ratio, Sodium Lauryl Sulphate|
Lecturer, Department of Petrochemical Technology, National Institute of Technology, Trichy, Tamilnadu, India
Assistant Professor, Deparment of Chemical Engineering, National Institute of Technology, Trichy, Tamilnadu, India
Professor and Head of the Deparment, Department of Chemical Engineering, National Institute of Technology, Trichy, Tamilnadu, India
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