  The study of dispersion of solid wastes through a porous media is important
in order to estimate the ecological impact that, in particular, a radioactive
solid waste could produce when it spreads in the soil. There are some models
available in literature which can help one simulate the dispersion of
contaminants through a porous media, taking into account the physicochemical
properties of the waste and its effect over the mobility, the
adsorption-desorption equilibrium, and the irreversible adsorption over the
walls that constitute the channel where it diffuses. However, the majority of
these models do not consider the cooperative behavior given by the presence of
other species competing each other for the substrate, nor the consequences that
this competition produces in the thermodynamic equilibrium of the system. In
this cases, the mesoscopic simulations have shown to be a viable alternative to
study these kinds of systems. This work presents the study of the
adsorption-desorption process for different components in a contaminated fluid
by electrostatic mesoscopic molecular simulation using the dissipative particle
dynamics method (DPD). It also shows how the presence of different components
modifies the adsorption-desorption equilibrium, and this result suggests the
importance of including the presence of all species in order to obtain results
closer to reality.
