Fig. 4

The effects of the operational variables are: (a) the initial concentration of BR 46; (b) the effect of light source Position; (c) the effect of rotating speed; and (d) the effect of clay dose.

The effects of the operational variables are: (a) the initial concentration of BR 46; (b) the effect of light source Position; (c) the effect of rotating speed; and (d) the effect of clay dose.