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TREATMENT OF ACID MINE DRAINAGE BY THE ALUMINA-LIME-SODA PROCESS
Citation:
Nebgen, J., D. Weatherman, M. Valentine, AND E. Shea. TREATMENT OF ACID MINE DRAINAGE BY THE ALUMINA-LIME-SODA PROCESS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-76/206 (NTIS PB259930), 1976.
Description:
The alumina-lime-soda process is a chemical desalination process for waters in which the principal sources of salinity are sulfate salts and has been field tested at the Commonwealth of Pennsylvania's Acid Mine Drainage Research Facility, Hollywood, Pennsylvania, as a method to recover potable water from acid mine drainage. The alumina-lime-soda process involves two treatment stages. Raw water is reacted with sodium aluminate and lime in the first stage to precipitate dissolved sulfate as calcium sulfoaluminate. In the second stage, the alkaline water (pH = 12.0) recovered from the first stage is carbonated to precipitate excess hardness. Following carbonation, product water meets USPHS specifications for drinking water. Alumina-lime-soda process economics are influenced most by the cost of sodium aluminate.