WWRC 87-15
Geochemical Modeling Research Related to the Surface
Disposal of Processed Oil Shale Solid Waste
Abstract
Several geochemical codes are available in the literature to model
chemical processes such as oxidation-reduction, precipitation-dissolution,
formation of solution complex, 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
concluded that all these models lack thermodynamic data for minerals
and solution complexes which are important for oil shale solid waste
studies. Selection of any one of the models would require development
of a more reliable thermodynamic database, and this report describes
the initiation of that work. So far, critical evaluation of thermodynamic
data has been completed for Sr, F, Mo, and Se.
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