Solidification of Superfund Soils

Soils from an actual Superfund site in the Northeast were used in this part of the investigation. These soil samples were found to be contaminated with cobalt, nickel and cadmium ranging from 3000 to 5000 mg/kg. 

Upon receipt of these samples, the water content was determined and adjusted. For these experiments the desired water content was 55%. These adjustments are done depending on the mixing requirements and material handling requirements. 

The three samples with the optimum reagent ratios (Ratio A, B, and C) were subjected to TCLP analysis and the leachate was analyzed for arsenic, barium, cadmium, chromium, cobalt, lead, mercury, nickel, selenium and silver. 

In order to determine the long term stability, a Multiple Extraction Procedure (MEP) was conducted on one of the most solidified samples according to USEPA SW-846, method 1320 for all eight metals as above. 8  

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