370
S. H. Das et al.
For aerated condition:
Removal efficiency = 86.22656 + 0.1030 ∗ Cr (VI)concentration
− 0.013630 ∗ Pb concentration
+ 0.002546 ∗ Hg concentration
The optimum process parameters were 50 mg/l of Cr (VI), 50 mg/l of Pb, and
50 mg/l of Hg concentration under aerated condition. Maximum removal efficiency
for the above design was found out to be 90.83%.
Fig. 12 3D surface view of removal efficiency of resorcinol versus Hg and Cr (VI) concentrations
at constant Hg concentration under aerated condition
Fig. 13 Screenshot of the maximum removal efficiency of resorcinol as predicted by DesignExpert
11.0 for the given model