Variable CCD Experimental value pH of aqueous solution 4.9884 5.0 Biosorption dosage, w, g/L 35.3702 35 Initial cobalt concentration, mg/L 18.0555 20 Temperature, K 306.4727 303 % biosorption 95.7337 93.9

Table 8: Comparison of optimum values obtained from CCD and experimentation.