WWRC 88-32
Application of Geochemical Models to Oil Shale Solid Waste
Summary
Several geochemical codes are available in the literature to model
chemical processes such as oxidation-reduction, precipitation-
dissolution, formation of solution complexes, adsorption, and ion
exchange. However, these models differ in the environments to which
they apply. The objective of this research was to evaluate the
applicability of existing geochemical codes to predict water quality
from an oil shale solid waste environment. We selected EQ3/EQ6,
GEOCHEM, MINTEQ, PHREEQE, SOLMNEQ, and WATEQFC geochemical models for
further evaluation. We conclude that all these models lack
thermodynamic data for minerals and solution complexes that are
important for oil shale solid waste studies. Selection of any one of
the models requires the development of a more reliable thermodynamic
data base. Critical evaluation of thermodynamic data has been completed
for cations and anions that are important for oil shale solid wastes.
Equilibrium solubility studies suggest that akermanite and periclase are
too soluble to control the solubility of calcium and magnesium.
However, diopside does appear to control the solubility of calcium and
magnesium in oil shale solid waste waters.
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