caa a22 4500 475812891 CHVBK 20180406123801.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/BF02687258 doi (NATIONALLICENCE)springer-10.1007/BF02687258 Long-term performance of anoxic limestone drains [Elektronische Daten] [George Watzlaf, Karl Schroeder, Candace Kairies] Ten anoxic limestone drains (ALDs), buried beds of limestone gravel that add alkalinity through dissolution of calcite, have been monitored for a decade. Influent and effluent water quality data have been analyzed to determine the long-term performance of each ALD for treating coal mine drainage. Alkalinity concentrations in the effluent of the ten ALDs ranged from 80-320 mg/L as CaCO3 with near maximum levels of alkalinity being reached after approximately 15 hours of detention. ALDs that received mine water containing less than 1 mg/L of both ferric iron and aluminum have continued to produce consistent concentrations of alkalinity since their construction. However, an ALD that received 21 mg/L of aluminum experienced a rapid reduction in permeability and failed within eight months. Springer Verlag, 2000 Passive treatment nationallicence acid mine drainage nationallicence ALD nationallicence calcite dissolution nationallicence Watzlaf George National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut Schroeder Karl National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut Kairies Candace National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut Mine Water and the Environment Springer-Verlag 19/2(2000-09-01), 98-110 1025-9112 19:2<98 2000 19 10230 https://doi.org/10.1007/BF02687258 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02687258 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Watzlaf George National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut NATIONALLICENCE 700 1- Schroeder Karl National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut NATIONALLICENCE 700 1- Kairies Candace National Energy Technology Laboratory, U. S. Department of Energy, 626 Cochrans Mill Road, P. O. Box 10940, 15236, Pittsburgh, PA aut NATIONALLICENCE 773 0- Mine Water and the Environment Springer-Verlag 19/2(2000-09-01), 98-110 1025-9112 19:2<98 2000 19 10230 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer