Passive anoxic limestone drains

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.No embarg