Passive Treatment of Acid-Mine Drainage with Vertical-Flow Systems C. Zipper, Extension Specialist, Crop and Soil Environmental Sciences, Virginia Tech; and C. Jage, Land Trust Representative, New Jersey Conservation Foundation, Far Hills, NJ Publication Number 460-133, Posted June 2001

Figure 3

Figure 3. Alkalinity generation predicted by Equation 9 as a function of limestone residence time, with influent water-chemistry at values close to averages for the research data set. Both plots represent predicted response to influent water with Fe = 40 mg/l, acidity = 200 mg/l as CaCO₃, and Mn = 25 mg/l. The horizontal axis of the lower plot is on a log ₁₀ scale (log ₁₀ of 10 = 1; log ₁₀ of 100 = 2; log ₁₀ of 1000 = 3). The dashed lines represent a 95 percent confidence interval for 13 vertical flow cells providing data used to develop Equation 9.

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