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Applications Analysis Report
Soliditech, Inc. Solidification/Stabilization Process

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Applications Analysis Report Solidtech Inc. Solidification/Stabilization Process (1,682K)


U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Solidification/Stabilization Treatment Process
Soliditech, Inc.

ABSTRACT

Soliditech, Inc., Houston, Texas, developed a treatment process that immobilizes contaminants in soils and sludges by binding them in a concrete-like, leach-resistant matrix. The key features of this technology are a proprietary chemical reagent, Urrichem, that aids in waste stabilization and a uniquely-designed batch mixer that allows for complete control over the mixing and consistency of the treatment product. This process treats soils and sludges contaminated with organic compounds, metals, inorganic compounds, and oil and grease. Contaminated waste materials are collected, screened to remove oversized material, and introduced to the batch mixer. The waste material is mixed with water, Urrichem and other proprietary additives, and pozzolanic material (fly ash), kiln dust, or cement. The treated waste is discharged from the mixer into curing forms. The process was demonstrated in December 1988 at the Imperial Oil Company/Champion Chemical Company Superfund site in Morganville, New Jersey. Soils, filter cakes, and oily wastes from an old storage tank were treated during the demonstration. The demonstration featured a number of physical and chemical tests, including measurements for metals, VOCs, PCBs, and oil and grease. Results from pre- and post-treatment extract and leachate analyses showed that heavy metals in the untreated waste were immobilized. Volatile organic compounds in the original waste were not detected in the treated waste. The oil and grease content of the untreated waste ranged from 2.8 to 17.3 percent (28,000 to 173,000 parts per million [ppm]). The oil and grease content of the TCLP extracts from the solidified waste ranged from 2.4 to 12 ppm. PCBs were not detected in any extracts or leachates from the treated waste. Physical test results of the solidified waste showed (1) the process solidified both solid and liquid wastes with high organic content (up to 17 percent); (2) UCS ranging from 390 to 860 pounds per square inch (psi); (3) very little weight loss after 12 cycles of wet and dry and freeze and thaw durability tests; and (4) low permeability of the treated waste. Process costs were estimated to be about $150/cubic yard when used to treat >5,000 cubic yards of waste similar to the demonstration material. This technology is no longer available through a vendor, contact the EPA Project Manager for further information.


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Posted June 22, 1999

 

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