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Environmental Technology Listing
Title of Listing:
DEHG
Category:
Treatment Technologies
Subcategory:
 *Waste, Soil, All Listings
Media:
Soil, Sludge
Contaminants:
Mercury
Web Site:
Email:
102604.1711@compuserve.com
Technology Description:

CHEMICAL TREATMENT - OXIDATION/REDUCTION

          Advanced Recovery Systems, Inc. (ARS) has developed a technology to convert a variety of mercury-bearing hazardous and mixed wastes to final non-hazardous forms meeting disposal criteria.

          The treated solids from this process typically have TCLP leachate mercury concentrations less than 0.05 mg/L. This is safely below the RCRA treatment standard of 0.2 mg/L. Filtrates from this process typically have mercury concentrations less than 0.02 mg/L.

          This technology can be applied to solid wastes containing both elemental mercury and mercury salts. In this process, the waste is initially shredded, slurried with water, chemically treated to immobilize elemental mercury by amalgamation, chemically treated with a proprietary reagent to convert mercury salts to a solid, non-leachable form, and dewatered.

          The technology can also be applied to bulk quantities of elemental mercury. In this modified version of the process, the elemental mercury is blended with treatment reagents to form a damp paste. This material sets in about 24 hours to form an amalgam with the mercury existing in a non-leachable form. The final waste form matrix does not contain free liquid mercury.

          Mercury-bearing waste solutions are also amenable to treatment by this technology. These wastes are processed by pretreating the solution, if necessary, to deter organic constituents from interfering with treatment of the mercury, chemically converting the mercury in the waste to a solid non-leachable form using a proprietary reagent, and dewatering the solids.

          The proprietary reagent used in this process to convert mercury salts to a solid non-leachable form that can be modified for use as lixiviant for extraction of mercury from solid wastes. This technology provides a low-temperature alternative to mercury recovery by roast/retorting.
Performance Status/
Limitations:

Performance Status:

          This technology has been successfully demonstrated in a RCRA permitted facility for treatment of various mercury-bearing solid wastes from a production laboratory. In this facility, 200 pound batches of mixed waste are treated to produce solids meeting disposal criteria and process filtrates meeting wastewater discharge requirements.

          Bulk quantities of elemental mercury have been treated to produce amalgam meeting RCRA treatment standards for leachable mercury. Centrifuge testing has verified that the final waste matrix does not contain any free liquid mercury.

          Limitations:

          Organics, if present in considerable quantities, can lead to problems. However, if we pretreat the feed before introducing to the process, this limitation can be overcome.
Topics
Mercury, Mixed/Radioactive Waste, Technologies, Treatment/Remediation
Additional Topics/Tags/Keywords
Oxidation/Reduction, Mercury

Organization:
ADVANCED RECOVERY SYSTEMS, INC.
Address:
1205 Banner Hill Road
Phone:
DescriptionNumber
City:
Erwin
1.
Primary (423) 743-2500
State/Province/Territory:
TN
2.
Zip/Postal Code:
37650
3.
Country:
United States
4.
Fax:(423) 743-2514
Branch Locations: