Elemental concentration, pond samples

Table IV. Elemental Concentration of Actual Ash Pond Samples Used in Fly Ash Sorbent Characterization.

The results show that fly ash can be used for treatment of Cd, Sn, Mo, Ni, Pb, Cu, Zn, Mn, Fe, As and organics in these ash pond effluents. Removals of greater than 75 percent were achieved for all of the above elements with the exception of Mo where removals of only 43% were obtained. For example, Figure 1 shows that the concentration of lead in the treated ash pond sample remained below detectable... 

The physical reaction of the ash to aqueous leaching is an important factor when considering the potential contamination of groundwater by these leachates. Concentrations of elements in leachates will be determined by the amount of ash exposed to leaching solutions. Observations of this type are useful in determining the mode of disposal most suited for the ash being produced. For example, the WYO-FA sample would be better suited to a dry disposal system, with an occasional wetting, rather than the pond system which is most frequently used. 

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