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DEMONSTRATION BULLETIN: SOLIDIFICATION/STABILIZATION OF ORGANIC/INORGANIC CONTAMINANTS - SILICATE TECHNOLOGY CORPORATION
Citation:
Bates*, E R. DEMONSTRATION BULLETIN: SOLIDIFICATION/STABILIZATION OF ORGANIC/INORGANIC CONTAMINANTS - SILICATE TECHNOLOGY CORPORATION. EPA/540/MR-92/010, 1992.
Impact/Purpose:
information
Description:
Silicate Technology Corporation's (STC's) technology for treating hazardous waste utilizes silicate compounds to stabilize organic and inorganic constituents in contaminated soils and sludges. STC has developed two groups of reagents: SOILSORB HM for treating wastes with inorganic constituents and SOILSORB HC for treating wastes with organic constituents. These two groups of reagents can be combined to treat wastes containing both organic and inorganic contaminants. These silicate reagents adsorb organic and inorganic contaminants prior to encapsulating the waste in a cementitious material. This process results in a high-strength, leach-resistant monolith. Treatability studies and site investigations are conducted to determine the necessary type and dosage of reagents required depending on the waste characteristics and treatment objectives. Treatment of contaminated soil (Figure 1) begins with separation of coarse and fine waste materials, and the crushing of coarse material which reduces it to the size required (<%") for the solidification technology. The pretreated waste is weighed and predetermined amounts of silicate reagents are added. The mixture is conveyed to a pug mill mixer where water is added and the mixture is blended. Sludges may be placed directly into the pug mill for addition of reagents and mixing. The amounts of reagents required for stabilization can be adjusted according to variations in organic and inorganic contaminant concentrations determined during treatability studies. Treated material is placed in confining pits for onsite curing or cast into molds for transport and disposal offsite.