The role of oxygen transfer in acid mine drainage (AMD) treatment

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Abstract
A study was conducted to evaluate two chemical models of iron oxidation. The first model was proposed by U. S. EPA in 1983 for use in the design of acid mine drainage (AMD) treatment systems. This model expresses the oxidation rate as a function of ferrous iron, oxygen concentrations, and pH. The second model was proposed by the U. S. Bureau of Mines and expresses the oxidation rate as a function of a treatment system's oxygen transfer rate. The findings of the study were that the model based on oxygen transfer was accurate in predicting oxidation rates over a wide range of initial ferrous iron concentrations. The predictions of the EPA model were inaccurate in modeling iron oxidation.

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