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 2. Effect of blending alkaline fly ash at 20% and 33% by volume with very acidic coal refuse on leachate pH. The unamended refuse (control) acidified to pH 1.8 within weeks. Both of the ash treatments maintained leachate pH above 6.0, but the 20% treatment began acidifying slightly by the end of the experiment. Figure adapted from Stewart et al. (1997). Each data point represents an average from three replicate columns for each treatment.

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