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Contaminant Mobility in Soils Amended with Fly Ash and Flue-Gas Gypsum: Intact Soil Cores and Repacked Columns

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Abstract

The impact of the land application of coal combustion by-products, fly ash (FA) and flue-gas desulfurization gypsum(FDG), to coarse-textured soils of the southeastern U.S.A. wasinvestigated using batch and dynamic column techniques. Two FAsamples, one an alkaline FA (Alk-FA) and the other an acidic FA(Acid-FA), were evaluated alone and in combination with FDG assoil amendments to an Appling loamy sand (Typic Hapludults). Theeffects of these waste products on clay dispersion, soilhydraulic conductivity (Ksat) and the migration ofcontaminants such as Arsenic (As) and Boron (B) were studiedusing intact soil cores and repacked soil columns. FA or combinationsof FA + FDG were applied to the surface of intact soil cores (10 Mg ha-1) and repacked soil columns or incorporated withinrepacked soil columns. The columns were saturated and thenleached for a prescribed number of pore volumes to simulateleaching conditions in the field. Effluent pH, electricalconductivity (EC), and turbidity were monitored and leachatefractions were collected for B, As, Ca, Mg, K and Na analysis.Both FA materials were ineffective at decreasing the inherentdispersibility of clay from the Ap horizon in batch tests.In fact, high application rates of the Alk-FA induced some claydispersion in the well-flocculated Bt soil materials, andcolumn results suggest that incorporating the Alk-FA within thesurface soil may actually reduce Ksat. In contrast,treatments with FDG were highly effective at inducing rapid clayflocculation in batch tests and eliminating effluent turbidityfor intact and repacked soil columns. Boron was readily mobilefrom both intact and repacked soil columns, a majority of whichleached from the columns within the first three pore volumes.Boron leaching was greater for combined treatments (FA + FDG),possibly indicative of enhanced solubilization in the presenceof FDG or sulfate (SO4 2-) competition for sorptionsites. Arsenic levels present in the leachates from FA and FDGcolumns were generally lower than control columns and roughlycorrelated with effluent turbidity. Combined treatments (FA +FDG) enhanced Mg and K leaching due to the added competition ofCa for cation exchange sites. Following leaching, the intactsoil cores were sectioned at 5 cm intervals and the pH and EC ofthe soil, as well as the vertical distribution of As and B, weredetermined. Levels of residual As were only slightly higher in the upper section of the FA-amended columns, showing little downward movement, but no clear trend in residual B was observed due to its greater mobility.

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Authors and Affiliations

  1. Soil Science Department, University Pertanian, Malaysia

    C. F. Ishak

  2. Advanced Analytical Center for Environmental Sciences, Savannah River Ecology Laboratory, University of Georgia, Aiken, U.S.A.

    J. C. Seaman

  3. Department Crop and Soil Sciences, University of Georgia, Athens, U.S.A

    W. P. Miller & M. Sumner

Authors
  1. C. F. Ishak
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  2. J. C. Seaman
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  3. W. P. Miller
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  4. M. Sumner
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Correspondence to J. C. Seaman.

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Ishak, C.F., Seaman, J.C., Miller, W.P. et al. Contaminant Mobility in Soils Amended with Fly Ash and Flue-Gas Gypsum: Intact Soil Cores and Repacked Columns. Water, Air, & Soil Pollution 134, 285–303 (2002). https://doi.org/10.1023/A:1014101217340

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