Kinetics and Mechanisms of the Release of Trace Inorganic Contaminants to Ground Water from Coal Ash Basins on the Savannah River Plant: Progress Report, October 1, 1987-September 30, 1988.

摘要

Undisturbed cores of ashes from the sites, randomly selected in the Old and New ash disposal basins, located in D-area on the Savannah River Plant were removed and sequentially extracted for the quantitative estimation of dissolved (pore water), exchangeable, Fe/Mn oxide associated and organic matter associated trace inorganic contaminants (i.e., As, Cd, Cr and Ni). Undisturbed cores of ashes were leached with deionized water, nitric acid (pH3) and calcium hydroxide (pH8) solution to evaluate the kinetics of release of trace metals. The ash samples were also analyzed for total P, K, Na, Ca, Mg, Al, Pb, Mn, F, B, Cu, Zn and Mo. Sluiced water samples, at four locations in the new ash basins, were tested for As, Ca, Cd, Cr, Fe, Mn, and Ni. Ground water samples from wells, installed at the ash sampling sites were tested for Ca, Mg, Na, K, P, Al, Fe, Mn, Ti, Cu, Zn, Ni, Mo, Cd, Si, Cr, Sr, B, Ba, Pb, V, As and Se. A very small fraction of the total elemental concentration, excepting Cd, were found in the dissolved phase. Most of the easily releasable elements in the ashes were found associated with Fe/Mn oxides and organic matter. Analysis of the data clearly indicates the release and mobilization of trace contaminants to the lower horizons of the impounded ashes. Elemental translocation was found to be more serious in the old ash basin. 19 refs., 17 tabs. (ERA citation 14:014239)