Passive anoxic limestone drains
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Date
1993-12
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Publisher
The Ohio State University
Abstract
A passive anoxic limestone drain is an effective and relatively inexpensive, long-term method of treating acid mine drainage. A PALD raises the pH of acidified waters and introduces alkalinity, which provides a buffer against further changes in pH caused by the oxidation and hydrolysis of iron. The systems can be designed to work in a variety of geologic and topographic settings. The PALD currently functioning in Perry County, Ohio has been successful in raising the pH of the raw drainage at an abandoned strip mine.