摘要：This paper presents a numerical procedure for simulating the dispersion of
ethanol-amended gasoline in ground water flows. In this problem the degree of
influence of the ethanol in the biodegradation of the BTEX compounds is not
known, since the common models does not include the presence of ethanol. The
transport equation includes the dispersion, advection, sorption and
biodegradation of the compounds BTEX and ethanol carried by the flow of water
modeled using the Darcy's equation for porous media flow. The mathematical model
is solved using the finite volume method with a first-order decay mode for the
biodegradation. It is assumed that the hydrophobic organic compounds solubility
in the aqueous-phase increases log-linearly with the presence of ethanol, in a
phenomenon called the "co-solvency effect". The sorption phenomenon (retard of
the plume) is modeled using linear equilibrium isotherm. To evaluate the model
and demonstrate its potentialities, it is solved some groundwater contamination
problems with ethanol-amended gasoline.
