Removal Of Chromium From Waste Water Using Locally Available Adsorbents

Different locally available adsorbents (aluminum slag, aluminum oxide hydroxide and aluminum oxide hydroxide saturated with fluoride) were tested for their efficiency in removing chromium from standard solutions prepared in the laboratory through batch mode experiments. Aluminum oxide hydroxide was found to be the most effective adsorbent for removal of Cr(III) whereas aluminum oxide hydroxide saturated with fluoride exhibited a highest adsorption efficiency for Cr(VI). Effects of pH, contact time, initial concentration and adsorbent dosage on the adsorption of Cr(III) and Cr(VI) were studied for these adsorbents. The investigation revealed almost a complete removal of Cr(III) (> 99%) over wide range of initial pH (3-10). And maximum removal of Cr(VI) (96 %) was obtained at initial pH 2. The adsorption capacities were also evaluated using Langmuir and Freundlich isotherms. Equilibrium data for adsorption of Cr(III) onto aluminum oxide hydroxide at varying adsorbent dose obeyed the two isotherms. The efficiency of the adsorbents towards the removal of chromium was tested using tannery waste effluent and found almost equally effective as the standard aqueous solution prepared in the laboratory.rnKey words: Aluminum oxide hydroxide; adsorption of chromium; tannery wastewater.

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