Bacterial Reduction of Hexavalent Chromium: Kinetic Aspects of Chromate Reduction byEnterobacter cloacaeHO1

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Abstract
Kinetic aspects of the bacterial reduction of hexavalent chromium (chromate: CrO2-4) were investigated using Enterobacter cloacae strain HO1. E. cloacae strain HO1 could reduce hexavalent chromium to the trivalent form (Cr3+) anaerobically. High concentrations of CrO2-4 inhibited the reduction, and a substrate inhibition model gave a good fit to the observed data. The rate of chromate reduction was proportional to cell density. The effect of temperature on the reduction rate followed the Arrhenius equation. The rate of chromate reduction was also dependent on pH and the concentrations of carbon and energy sources in the culutre medium. Amino acids including asparagine, methionine, serine and threonine were utilized effectively as carbon and energy sources for chromate reduction.