International Journal of Environmental Sciences

Volume 2 Issue 3 2012           Pages: 1180- 1191

Equilibrium and kinetic studies on biosorption of CR (VI) by Aspergillus Oryzae isolated from tannery effluent

Author Information:

Reya Issac. I- Department of Biotechnology, Karunya University, Coimbatore, India

Lakshmi Prabha M- Department of Biotechnology, Karunya University, Coimbatore, India

Emilin Renitta.R- Department of Biotechnology, Karunya University, Coimbatore, India

Murugan. S - Department of Biotechnology, Karunya University, Coimbatore, India

ABSTRACT
The present work is concerned to remove  Cr (VI) using the biosorption potential of the chromium resistant fungal biomass Aspergillus oryzae isolated from tannery effluent was studied. The dry fungal biomass was used to optimize various parameters such as contact time, initial metal ion concentration, pH, biomass loading etc. The percentage removal of chromium using various chemical pre-treatments was carried out. A maximum of 90.1% Cr (VI) removal was observed in 25 mg/L initial Cr (VI) metal ion concentration using dry Aspergillus oryzae biomass. A maximum of 96 % Cr (VI) removal was observed in 25 mg/L initial Cr (VI) metal ion concentration using nitric acid doped A.  oryzae biomass at 37ºC, pH 2.0 and 150 rpm. Further equilibrium modeling was carried out using Langmuir and Freundlich adsorption isotherm and the data were fitted. Kinetic studies have been evaluated with respect to first order and second order kinetic equations and arranged based on its adsorption capacity. The characterization studies were carried out using SEM. Desorption studies were carried out and the desorbed fungi was recycled effectively using 0.1M HCl and was found to remove 88.2% of Hexavalent chromium.

Keywords : Aspergillus oryzae, Biosorption, Freundlich Isotherm.

DOI: 10.6088/ijes.00202030006


© 2012 Copyright Reya Issac. I, licensee IPA.This is an open access article distributed under the Creative Commons Attribution License (2.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The electronic version of the article can be downloaded below.

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