Volume No. 4 Issue No.: 1 Page No.: 77-82 July-Sept 2009

 

BATCH STUDIES ON CHROMIUM REMOVAL FROM TANNERY EFFLUENT USING CATIONIC EXCHANGE RESIN

 

S. Bajpai*, Ghirish Jung1 and Apurba Dey2

1. Department of Leather Technology, National Institute of Technology, Jalandhar, (INDIA)
2. Department of Chemical Engineering, N.I.T., Jalandhar, (INDIA)

 

Received on : May 15, 2009

 

ABSTRACT

 

Basic chromium sulphate (BCS) salts are widely used as tanning material in tanneries for decades. This trivalent salt is the most preferred tanning material due to its low cost, easy availability and high affinity to form cross-linkages with skin protein giving high hydrothermal stability. However, Cr is a toxic heavy metal and it’S disposal in environment poses serious ecological threats. In India, the safe limit of Cr (III) concentration in wastewater stream (to be disposed in the river body) should be below 4 ppm and for hexavalent Cr it is 0.1 ppm. It is therefore important to not only recover/reuse Cr from waste stream prior to disposal for economic reasons but also to conform to the stringent laws. Separation of Cr can be done by many ways such as conventional precipitation and redissolution method, chemical and bio adsorption, membrane filtration, ion exchange process, etc.

In the present study we have studied the removal of Cr from weakly cationic exchange resin: Amberlite IR 120H. All the experiments are performed on synthetic solutions made from industrial grade BCS powder. The effect of the amount of resin, the concentration of the Cr in the solution and the pH on the removal are analyzed and studied. Adsorption isotherms followed by the resin is determined. It is found that the removal is very good at low concentration and Amberlite IR 120 H is able to remove 99% of the Cr present in the 50 ppm of the synthetic solution under optimized conditions.

 

Keywords : Waste water, Chromium, Heavy metal, Adsorption, Resin

 

 

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