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EFFECTS OF LEACHING ON PORE SIZE DISTRIBUTION OF SOLIDIFIED/STABILIZED WASTES
Citation:
Bishop, P. L., R. Gong, AND T. C. Keener. EFFECTS OF LEACHING ON PORE SIZE DISTRIBUTION OF SOLIDIFIED/STABILIZED WASTES. JOURNAL OF HAZARDOUS MATERIALS. Elsevier BV, AMSTERDAM, Netherlands, 31(1):59-74, (1992).
Impact/Purpose:
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Description:
Chemical solidification/stabilization processes are commonly used to immobilize metals in fly ash and flue gas desulfurization (FGD) sludges and to convert these wastes into monolithic or granular materials with better handling properties and reduced permeabilities. his study evaluated the role of pore structure of solidified materials during leaching. he solidified material's initial pore structure, changes in the pore structure which result during leaching, and the effects of pore structure on leaching are discussed. t was found that pore structures varied depending upon the wastes used and the solidification mix formulations tested. fter acetic acid leaching, the pore structures of samples changed remarkably. otal pore volumes and pore sizes increased. he percentage of larger pores (diameter greater than 6000 nm) increased from below 5% for before-leaching samples to above 23% for after-leaching samples. he higher the alkalinity in a sample, the greater the change of pore structure due to leaching. hanges in pore structure were primarily due to leaching of calcium hydroxide.
