Hexavalent chromium removal by waste mycelium of Aspergillus awamori

Author:

Gochev Velizar1,Velkova Zdravka2,Stoytcheva Margarita3

Affiliation:

1. Department of Biochemistry and Microbiology, Paisii Hilendarski University of Plovdiv, Plovdiv, Bulgaria

2. Department of. Inorganic and Physical Chemistry, University of Food Technologies, Plovdiv, Bulgaria

3. University of Baja California, Mexicali, Mexico

Abstract

In this study, the Cr(VI) removal potential of waste mycelium from the industrial xylanase-producing strain Aspergillus awamori was evaluated. It was determined by FTIR analysis that amino groups from the major fungal wall constituents, chitin and chitosan, played a key role in the metal binding process. The effect of pH, initial ion concentration, temperature and amount of biomass on the removal was also studied. The removal efficiency increased with decreasing pH and increasing temperature and amount of biomass. The mechanism of Cr(VI) removal by A. awamori can be explained by a two-stage process involving an initial adsorption stage followed by a reducing stage. The removal process was described by a second-order polynomial and the optimal process parameters for attaining Rmax 94.4 % in 48 h were predicted, i.e., pH 1.5 and T 40?C. From both economic and ecological points of view, a promising possibility for the utilization of waste industrial mycelium of A. awamori as a low-cost Cr(VI) removal agent was proposed.

Publisher

National Library of Serbia

Subject

General Chemistry

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