Research Article Bioreduction of Hexavalent Chromium by Live and Active Phanerochaete chrysosporium:Kinetics and Modeling

摘要

In this work the potential of live and active Phanerochaete chryosporium, a white rot fungi, to remove lower Cr(Ⅵ) concentration from aqueous solutions was reported for the first time. A medium pH had significant effect on the growth of the fungus and bioremoval of Cr(Ⅵ). Substrate inhibition on the growth of Phanerochaete chrysosporium was evident -beyond 20 g L~(-1) of dextrose concentration. A maximum biomass concentration of 15.64 g L~(-1) was obtained for an initial dextrose concentration of 20 g L~(-1) in metal free medium at pH 6.0. An increase in Cr(Ⅵ) concentration beyond 10 mg L~(-1) inhibited the growth of the fungi, thereby, reducing the chromium bioremoval efficiency. A maximum reduction efficiency of 98.92% was reported for an initial metal concentration of 10 mg L~(-1). A mathematical expression for the bioreduction of Cr(Ⅵ) considering the organic compounds in the cells was proposed.