The best percentage present it was with the activated support (ABP), it extinguishes its maximum
value of 98.540 % with a concentration of the MB of 25 mg/L, this percentage did not change perfectly when the concentration increased for great values of 80 et 100 mg/l, in the contrary, the natural support it reaches its maximum percentage of 93.448 % for the same concentration (25 mg/L) then it was started to decrease for the up concentrations witch is indeed shown in the table (3) below. It is because with low concentrations the relationship between the active sites of surface and the molecules of dye in the solution is raised, thus all the molecules will have been retained by biosorbent and eliminated completely from the solution. However, at high concentrations, quantity of dye adsorbed per unit of mass of biosorbent, is more significant, which causes a saturation of support and thus a quantity of the dye remains free in the
solution that causes low yield.