The Potential for Beneficial Reuse of Coal Fly Ash in Southwest Virginia Mining Environments Authors: W. Lee Daniels, Professor, Crop and Soil Environmental Sciences; Barry Stewart, Assistant Professor, Mississippi State University; Kathryn Haering, Research Associate, Crop and Soil Environmental Sciences; and Carl Zipper, Extension Specialist, Crop and Soil Environmental Sciences; Virginia Tech Publication Number 460-134, Posted January 2002

Figure 3. Effect of blending two ashes (CRF above, WVF below, at varying rates) with acidic coal refuse on leachate pH over time. One ash (CRF) was relatively high in pH (pH = 11), while the other (WVF) was only moderately alkaline (pH = 8). The control, 5% WVF and 10% WVF blended treatments all acidified quickly to pH < 2.0, while the 20% WVF treatment was time-lagged by almost two years before it acidified. The higher blending rates (33% WVF and 20% and 33% CRF) kept leachate pH above 7.0 for three years. Figure adapted from Stewart (1996). Each data point represents an average leachate pH from three replicate columns for each treatment.

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