Title: Utilisation of Andisols as possible low-cost adsorbent to remove Cr (VI) from aqueous solution

Authors: Sandhya Babel, Einstine M. Opiso

Addresses: Environmental Technology Program, Sirindhorn International Institute of Technology, School of Bio-Chemical Engineering and Technology, Thammasat University, P.O. Box 22, Thammasat Rangsit Post Office, Pathumthani 12121, Thailand. ' Environmental Technology Program, Sirindhorn International Institute of Technology, School of Bio-Chemical Engineering and Technology, Thammasat University, P.O. Box 22, Thammasat Rangsit Post Office, Pathumthani 12121, Thailand

Abstract: The potential of using Andisols to remove Cr (VI) from aqueous solution was evaluated by batch and column experiments. The results showed that the A-horizons (Isarog: 63%; Mandalagan: 42%) of the soils have lower adsorption capacity compared to B-horizons (Isarog: 93%; Mandalagan: 66%) using a dose of 20 g/L and Cr (VI) concentration of 10 mg/L. The adsorption capacity of B-horizons using column experiments were also found to retain more Cr (VI) than batch technique. Hence, the B-horizon of the studied Andisols can be used as an effective adsorbent for Cr (VI) removal from contaminated water systems.

Keywords: hexavalent chromium; andisols; adsorption isotherms; acid treatment; chromium(IV) removal; water pollution.

DOI: 10.1504/IJETM.2010.031533

International Journal of Environmental Technology and Management, 2010 Vol.12 No.2/3/4, pp.277 - 293

Published online: 10 Feb 2010 *

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