Leaching of Inorganic Hazardous Constituents from Stabilized/Solidified Hazardous Wastes

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Abstract
Stabilization/solidification of hazardous liquids and sludges by a variety of techniques has been investigated as a method of treatment that will bind hazardous materials in a form that minimizes adverse effects on the environment after landfilling. Many of these processes use cement, silicates, flyash and/or other pozzolanic materials to convert the vaste to a solid, monolithic form with greatly reduced leaching potential. However, currently available leaching tests, such as the U.S. EPA Extraction Procedure or Toxicity Characteristic Leaching Procedure, do not adequately address the potential for leaching or the rate of leaching for vaste forms of this type. This paper discusses the metal-binding mechanisms involved in the stabilization/solidification process. Long term leaching potentials for selected metals are also estimated.

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