Removal of Chromium(VI) ions by Foam Separation: Aqueous and Industrial Effluent

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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
Stream: Environmental Sustainability
Presentation Type: Paper Presentation in English
Paper: , Removal of Chromium(VI) ions by Foam Separation

Arulmozhi Muthukumarasamy

Lecturer, Department of Petrochemical Technology, Anna University
Tiruchirappalli, Tamilnadu, India

I have 8 years of Teaching experience in Chemical Engineering field. I completed B.E.(Chemical)in the year 1997 and M.E.(Chemical) in the year 2000. I have presented 4 papers in National and International conferences.Presently I am persuing my research in the Chemical Engineering Department of National Institute of Technology,Trichy(NITT) under the guidence of Dr.Meera S.Begum,Asst.Professor in Chemical Engineering,NITT. Our research is in the area of Foam separation, a separtion operation old in principle but new in application. This technique is useful for the separation of proteins, heavy metal ions, compounds etc. from dilute aqueous solutions.

M. Jaleel Rahaman

Affiliation not supplied
Trichy, Tamilnadu, India

Dr. K.M. Meera Sheriffa Begum

Assistant Professor, Deparment of Chemical Engineering, National Institute of Technology
Tiruchirappali, Tamilnadu, India

Completed her Ph.D in Chemical Engineering from Anna University,Chennai and worked as Engineer in Chennai Petroleum Corporation Limited(CPCL) after which she joined as faculty at central government owned institution National Institute of Technology,Trichy.

She has several Publications in natioanl and Internatioal journals

Dr. N. Anantharaman

Professor and Head of the Deparment, Department of Chemical Engineering, National Institute of Technology
Trichy, Tamilnadu, India

Ref: S08P0137