BIOSORPTION OF CR (VI) BY RESTING CELLS OF ASPERGILLUS SP.

Biosorption of Cr(VI) from aqueous solution was studied in a batch bioreactor using the resting cells of filamen tous funga l biomass (Aspergillus sp.) isolated from industrial wastewaters. The specific Cr(VI) removal (mg/g of dried biomass) decre ased with increase in pH and increased with increase in initial Cr(VI) conce ntration , upto 500 mg/L. By increasing biomass concentration from 2.4 to 5.2 g/L, the specific metal remova l remai ned almost constant. The studies carried out by using the resting cells from vario us stages of growth indicated maximum Cr(VI) remov al of 34.8 mg/g using the bioma ss from the beginning of the stationary phase. The adsorption equilibrium constants Q (42 .9 mg/g) and b (0.009 1Img) were obtained from the Langmuir adsorption isotherm model.