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THERMAL ENCAPSULATION OF METALS IN SUPERFUND SOILS
Citation:
Lees, J. N., G. A. Heian, M K. Richards*, T. F. McGowan, AND R. A. Carnes. THERMAL ENCAPSULATION OF METALS IN SUPERFUND SOILS. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION. AWMA, Pittsburgh, PA, 45(7):514-520, (1995).
Impact/Purpose:
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Description:
Superfund sites frequently contain both heavy metals and organic hazardous waste. If not properly controlled, the metals may be changed to a more leachable form and may also be emitted to the atmosphere via the exhaust stack. This paper documents a batch kiln R&D test program to solve these metal-related problems. It was performed un- der the U.S. EPA`s SITE (Superfund Innovative Technology Evaluation) Emerging Technology Program. Allis Mineral Systems has developed the Thermal Encapsulation Pro- cess. Metals with limits set by EPA`s TCLP (Toxicity Char- acteristic Leaching Procedure) test and BIF (boiler and industrial furnace) stack emission regulations, such as cad- mium, chromium, and lead, are the initial target of this process. This process, while unproven in these areas, may also apply to mixed waste (EPA hazardous waste/low-level radioactive wastes) and may also benefit commercial haz- ardous waste or Superfund thermal treatment systems. The results of the SITE tests were positive: strong, durable nod- ules were produced with excellent crush strength and im- proved resistance to leaching. Feed preparation, particularly control of moisture content, was found to be a key element in initiation of agglomeration. A good cor- relation was found between decreasing TCLP metals leachate levels and increasing crush strength.
