Abstract
This study was conducted to assess the abundance of iron-oxidizing bacteria and biological sulfur oxidation potential from soil impacted by coal and coal refuse from two coal-burning electric power facilities located at the U.S. Department of Energy's Savannah River Site (Aiken, S.C.) and the South Carolina Electric and Gas Site at Beech Island, S. C.
Significantly higher MPN counts of iron-oxidizing bacteria were obtained from samples collected at the confluence of a coal storage runoff containment basin, a coal reject (refuse) pile, and an adjacent wetland at the Savannah River Site. Significant differences in pH, sulfate-S, ferrous- and ferric-iron were also obtained between sampling locations. No significant differences in ferric/ferrous ratios were determined. These ratios however, exceeded a value of 2.0 when sample pH values were less than 4.5.
Under optimal conditions, biological thiosulfate-S oxidation potentials (in vitro) showed a 4- to 7-day lag in the appearance of sulfate-S, and a final pH (after twenty-four days of perfusion) of 1.97 to 3.90. These results indicate that contamination of subsurface water by acidic leachate derived from thionic bacterial activity will occur if coal and coal refuse piles are not confined by an impermeable surface or containment facility.
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Klubek, B., Schmidt, C. & Adriano, D.C. Abundance of Iron-Oxidizing Thiobacilli and Biological Sulfur Oxidation Potential from Soil Impacted by Coal and Coal Refuse Piles. Water, Air, & Soil Pollution 106, 1–16 (1998). https://doi.org/10.1023/A:1004996815896
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DOI: https://doi.org/10.1023/A:1004996815896