Stabilization of toxic metals in a waste matrix and pore water
AssigneeRMT, Inc.
InventorsAjit Chowdhury, Lane D. Tickanen
Life of this patent
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Abstract
A method is provided for stabilizing toxic materials in a waste matrix and in the pore water of the waste matrix. The method includes the steps of combining with the waste matrix (and pore water) an agent for controlling the oxidation-reduction potential of the matrix/water, an agent for controlling the pH of matrix/water, and an agent for adsorbing or coprecipitating the toxic material in the matrix/water.
Claims59
A method for stabilizing arsenic in arsenic-contaminated pore water of a waste matrix containing the pore water, the method comprising the steps of:
- mixing with the waste matrix an agent for controlling oxidation-reduction potential of the pore water, an agent for controlling pH of the pore water, and an agent for adsorbing and coprecipitating the arsenic, so that the arsenic concentration in the pore water is present at no higher than a preselected level, the sum of the amounts of the added agents being insufficient to cause the pore water to solidify if a binding agent were also added.
A method for stabilizing arsenic in an arsenic-contaminated pore water of a waste matrix containing the pore water, the method consisting essentially of the step of:
- mixing with the waste matrix an agent for controlling oxidation-reduction potential of the pore water, an agent for controlling pH of the pore water, and an agent for adsorbing and coprecipitating the arsenic, the sum of the amounts of added agents being insufficient to cause the pore water to solidify in the absence of a binding agent.
A method for stabilizing antimony in an antimony-contaminated waste matrix, the method comprising:
- mixing with the waste matrix an agent for controlling oxidation-reduction potential of the liquid, an agent for controlling pH of the liquid, and an agent for adsorbing and coprecipitating the antimony, so that the antimony leaches from the waste matrix at no higher than a preselected level, the sum of the amounts of the added agents being insufficient to cause the waste matrix to solidify if a binding agent were also added.
A composition for stabilizing a toxic metal in a waste matrix, the composition comprising an agent for controlling oxidation-reduction potential of the matrix, an agent for controlling pH of the matrix, and an agent for adsorbing and coprecipitating the material.
Dependencies are inferred from the claim text.