Results from five years of treatability studies using hydraulic binders to stabilize low-level mixed waste at the INEL

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This paper summarizes work involving bench-scale solidification of nonincinerable, land disposal restricted low-level mixed waste. Waste forms included liquids, sludges, and solids; treatment techniques included hydraulic systems (Portland cement with and without additives), proprietary commercial formulations, and sulphur polymer cement. Solidification was performed to immobilize hazardous heavy metals (including mercury, lead, chromium, and cadmium), and volatile and semivolatile organic compounds. Pretreatment options for mixed wastes are discussed, using a decision tree based on the form of mixed waste and the type of hazardous constituents. Hundreds of small concrete monoliths were formed for a variety of waste types. The experimental parameters ... continued below

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19 p.

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Gering, K.L. & Schwendiman, G.L. May 1, 1997.

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Description

This paper summarizes work involving bench-scale solidification of nonincinerable, land disposal restricted low-level mixed waste. Waste forms included liquids, sludges, and solids; treatment techniques included hydraulic systems (Portland cement with and without additives), proprietary commercial formulations, and sulphur polymer cement. Solidification was performed to immobilize hazardous heavy metals (including mercury, lead, chromium, and cadmium), and volatile and semivolatile organic compounds. Pretreatment options for mixed wastes are discussed, using a decision tree based on the form of mixed waste and the type of hazardous constituents. Hundreds of small concrete monoliths were formed for a variety of waste types. The experimental parameters used for the hydraulic concrete systems include the ratio of waste to dry binder (Portland cement, proprietary materials, etc.), the total percentage of water in concrete, and the amount of concrete additives. The only parameter that was used for the sulfur polymer-based monoliths is ratio of waste to binder. Optimum concrete formulations or {open_quotes}recipes{close_quotes} for a given type of waste were derived through this study, as based on results from the Toxicity Characteristic Leaching Procedure analyses and a free liquids test. Overall results indicate that high waste loadings in the concrete can be achieved while the monolithic mass maintains excellent resistance to leaching of heavy metals. In our study the waste loadings in the concrete generally fell within the range of 0.5 to 2.0 kg mixed waste per kg dry binder. Likewise, the most favorable amount of water in concrete, which is highly dependent upon the concrete constituents, was determined to be generally within the range of 300 to 330 g/kg (30-33% by weight). The results of this bench-scale study will find applicability at facilities where mixed or hazardous waste solidification is a planned or ongoing activity. 19 refs., 1 fig., 5 tabs.

Physical Description

19 p.

Notes

INIS; OSTI as DE97052976

Source

  • Waste Management `97, Tucson, AZ (United States), 2-7 Mar 1997

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  • Other: DE97052976
  • Report No.: INEL--96/00343
  • Report No.: CONF-970335--48
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 484512
  • Archival Resource Key: ark:/67531/metadc686194

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  • May 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • June 13, 2016, 8:47 p.m.

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Gering, K.L. & Schwendiman, G.L. Results from five years of treatability studies using hydraulic binders to stabilize low-level mixed waste at the INEL, article, May 1, 1997; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc686194/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.