Biosorption of Cr(VI) from aqueous solution was studied in a batch bioreactor using the resting cells of
filamentous fungal biomass (
Aspergillus
sp.) isolated from industrial wastewaters. The specific Cr(VI) removal (mg/g of dried biomass) decreased with increase in pH and increased with increase in initial Cr(VI) concentration, upto 500 mg/L. By increasing biomass concentration from 2.4 to 5.2 g/L, the
specific metal removal remained almost constant. The studies carried out by using the resting cells from
various stages of growth indicated maximum Cr(VI) removal of 34.8 mg/g using the biomass from the
beginning of the stationary phase. The adsorption equilibrium constants Q° (42.9 mg/g) and b (0.0091/mg)
were obtained from the Langmuir adsorption isotherm model.
