Stabilization of inorganic mixed waste to pass the TCLP and STLC tests using clay and pH-insensitive additives

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Description

Stabilization traps toxic contaminants (usually both chemically and physically) in a matrix so that they do not leach into the environment. Typical contaminants are metals (mostly transition metals) that exhibit the characteristic of toxicity. The stabilization process routinely uses pozzolanic materials. Portland cement, fly ash-lime mixes, gypsum cements, and clays are some of the most common materials. In many instances, materials that can pass the Toxicity Characteristic Leaching Procedure (TCLP-the federal leach test) or the Soluble Threshold Leachate Concentration (STLC-the California leach test) must have high concentrations of lime or other caustic material because of the low pH of the ... continued below

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11 p.

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Bowers, J.S.; Anson, J.R.; Painter, S.M. & Maitino, R.E. March 1, 1995.

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Description

Stabilization traps toxic contaminants (usually both chemically and physically) in a matrix so that they do not leach into the environment. Typical contaminants are metals (mostly transition metals) that exhibit the characteristic of toxicity. The stabilization process routinely uses pozzolanic materials. Portland cement, fly ash-lime mixes, gypsum cements, and clays are some of the most common materials. In many instances, materials that can pass the Toxicity Characteristic Leaching Procedure (TCLP-the federal leach test) or the Soluble Threshold Leachate Concentration (STLC-the California leach test) must have high concentrations of lime or other caustic material because of the low pH of the leaching media. Both leaching media, California`s and EPA`s, have a pH of 5.0. California uses citric acid and sodium citrate while EPA uses acetic acid and sodium acetate. These media can form ligands that provide excellent metal leaching. Because of the aggressive nature of the leaching medium, stabilized wastes in many cases will not pass the leaching tests. At the Lawrence Livermore National Laboratory, additives such as dithiocarbamates and thiocarbonates, which are pH-insensitive and provide resistance to ligand formation, are used in the waste stabilization process. Attapulgite, montmorillonite, and sepiolite clays are used because they are forgiving (recipe can be adjusted before the matrix hardens). The most frequently used stabilization process consists of a customized recipe involving waste sludge, clay and dithiocarbamate salt, mixed with a double planetary mixer into a pasty consistency. TCLP and STLC data on this waste matrix have shown that the process matrix meets land disposal requirements.

Physical Description

11 p.

Notes

INIS; OSTI as DE95009534

Source

  • HAZMACON `95: hazardous materials management conference and exhibition, San Jose, CA (United States), 4-6 Apr 1995

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  • Other: DE95009534
  • Report No.: UCRL-JC--118901
  • Report No.: CONF-9504134--2
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/46629 | External Link
  • Office of Scientific & Technical Information Report Number: 46629
  • Archival Resource Key: ark:/67531/metadc686902

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1995

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Feb. 23, 2016, 6:11 p.m.

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Bowers, J.S.; Anson, J.R.; Painter, S.M. & Maitino, R.E. Stabilization of inorganic mixed waste to pass the TCLP and STLC tests using clay and pH-insensitive additives, report, March 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc686902/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.