**2.3. Modeling of biosorption**

The equilibrium distribution of the sorbed pollutant (sorbate) between the sorbent and the aqueous phase is required to determine the maximum sorbent's uptake capacity for a sorbate and to understand the sorption mechanism.

Besides sorbate distribution at equilibrium, the sorption kinetics provides additional important information about the sorption mechanism, especially the rate of pollutant removal. When applied in water treatment technology, information on sorption kinetics is important for setting an optimum residence time of the wastewater at the biosolid phase interface.
