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  Stabilization and Testing of Mercury-Containing Wastes: Borden Sludge (EPA/600/R-02/020) April 2002

This report details the stability assessment of a mercury-containing sulfide treatment sludge. Information contained in this report consists of background data submitted by the generator, landfill data supplied by EPA, and characterization and leaching studies conducted by the University of Cincinnati (UC) and contract laboratories.

Borden Chemicals and Plastics (BCP) provided background data for June 1997 through November 1998. The data summary included total mercury, reactive sulfide, the Toxicity Characterization Leaching Procedure (TCLP), and pH information relating to BCP’s sulfide-treated sludge.

BCP's sulfide sludge is currently being disposed of in a subtitle C landfill located in Carlyss, Louisiana. Data on the leachate from the landfill were provided by EPA’s Office of Solid Waste.

Samples collected at the BCP plant on November 19, 1998, were characterized by UC and two contract laboratories for thermogravimetric analysis, total mercury content, pH, acidity cation exchange capacity, etc. Leaching tests and analytical work included the TCLP, solids stability in water, leaching at constant pH values, and acidity.

Preliminary point estimates of measured mercury concentrations in the generated leachates indicate that the mercuric sulfide complex is very strong in low-pH environments. However, higher pH conditions may result in mercury mobilization to the aqueous phase.


Paul Randall

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