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 5

Figure 5. Observed alkalinity generation rates at 18 vertical flow cells (system averages over time), expressed as mg/l and per-square-foot of surface area. Performance variations occur due to differences in water chemistry, residence times, details of system design, and other factors. Performance data for the Oven Run and Howe Bridge systems were obtained from published literature (Watzlaf and others, 2000).

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