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Abstract
Several designated hazardous wastes (metals: Cd, Cr, Ni, Cu; plating waste; oil sludge; aluminum forming processing sludge) were studied relative to potential detoxification using dry calcium-based flue gas desulfurization (FGD) sludges. The FGD waste was generated from a pilot scale system which utilized slurried lime, a spray dryer, and a bag filter. Following detailed physical and chemical identification of the raw FGD and hazardous wastes, various mixtures were prepared and cured. In all cases, even with the organic sludge, a rigid structural material evolved due to the pozzolanic reactions occurring from the wetted dry FGD waste. Structural characteristics, physical character, and chemical leaching effects were evaluated. The solids were leached according to both the acetic acid and deionized water proposed leaching procedures. In all cases, the hazardous constituents were not leached. Finally, the feasibility of using dry FGD wastes as fixating materials is discussed.
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