A mathematical model was developed to simulate the transport and dissolutio
n of colloidal particles with a water-soluble component in a porous medium.
The model is based on mass balance equations describing the mass transport
, dissolution, sorption, capture, and release of colloids in a three-phase
medium consisting of a solid matrix, an aqueous phase, and colloids. Colloi
d dissolution, contaminant sorption on solid matrix, and colloid capture me
chanisms are represented by first-order kinetics. A numerical comparison of
the model of a water-soluble component associated with fly ash-mobilized t
ransport and transport due only to dissolved component migration indicates
that the presence of colloids significantly increases the aqueous phase con
taminant concentration.