Biosorption of CR [VI] by resting cells of Aspergillus Sp.

ABSTRACT

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