A column evaluation of Appalachian coal mine spoils' temporal leaching behavior.

Autor: Orndorff ZW; Virginia Tech. Department of Crop and Soil Environmental Sciences, 330 Smyth Hall, Blacksburg, VA 24061, United States. Electronic address: zenah@vt.edu., Daniels WL; Virginia Tech. Department of Crop and Soil Environmental Sciences, 330 Smyth Hall, Blacksburg, VA 24061, United States. Electronic address: wdaniels@vt.edu., Zipper CE; Virginia Tech. Department of Crop and Soil Environmental Sciences, 330 Smyth Hall, Blacksburg, VA 24061, United States. Electronic address: czip@vt.edu., Eick M; Virginia Tech. Department of Crop and Soil Environmental Sciences, 330 Smyth Hall, Blacksburg, VA 24061, United States. Electronic address: eick@vt.edu., Beck M; Virginia Tech. Department of Crop and Soil Environmental Sciences, 330 Smyth Hall, Blacksburg, VA 24061, United States. Electronic address: mikebeck@vt.edu.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2015 Sep; Vol. 204, pp. 39-47. Date of Electronic Publication: 2015 Apr 23.
DOI: 10.1016/j.envpol.2015.03.049
Abstrakt: Appalachian surface coal mine overburden affects water quality as drainage percolates through spoil disposal fills. This study evaluated leaching potentials of 15 spoils from south-central Appalachia. Most bulk samples were non acid-forming, all were low in total-S, (≤0.34%), and initial saturated paste specific conductance (SC) ranged from 264 to 3560 μS cm(-1). Samples were leached unsaturated (40 cycles) and leachates analyzed for pH, SC, and ion composition. Overall, leachates from unweathered spoils were higher in pH and SC than leachates from weathered spoils. Fine-textured spoils generally produced higher SCs than more coarsely textured spoils. Mean SC for all spoils decreased rapidly from an initial peak of 1468 μS cm(-1) (±150) to 247 μS cm(-1) (±23). Release patterns for most major ions reflected declining SC. Bicarbonate typically increased with successive leaches, replacing sulfate as the dominant anion. Column SC values were comparable to relevant published field data.
(Copyright © 2015 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: