||Abatement of Mine Drainage Pollution by Underground Precipitation.
Stoddar, C. K. ;
||Pennsylvania Dept. of Environmental Resources, Harrisburg.
||EPA-WPRD-242-01; EPA-14010-EJF; 05106,; 670/2-73-092
Coal mines ;
Mine waters ;
Field tests ;
Water pollution ;
Mine acid drainage
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Laboratory tests with synthetic acid mine water show the sealing effect of the gelatinous precipitate that forms when hydrated lime or powdered limestone is added in a simulated mine entry closed by a porous barrier. Field tests were conducted in a recently abandoned coal mine. Hydrated lime and limestone slurries were pumped into the mine water behind rubble barriers through 2-inch steel pipes to test the laboratory findings. The outflow was observed at weirs attached to the ends of two 12-inch diameter drain pipes. The results indicated that only temporary sealing of the outflow was achieved and that neutralization took place when the interior water flow conditions were favorable. (Modified author abstract)