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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

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.

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1. 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,

1. 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. 2. A method as claimed in claim 1 wherein the agent for controlling oxidation-reduction potential is an oxidizing agent.3. A method as claimed in claim 2 wherein the agent for controlling oxidation-reduction potential is selected from a group consisting of potassium permanganate, sodium chlorate, sodium perchlorate, calcium chlorite, a chlorinated oxidizing agent, sodium percarbonate, sodium persulfate, sodium perborate, potassium persulfate, a peroxide compound, a compound of a multivalent element at its higher oxidation state, ferric sulfate, gaseous oxygen, and ozone.4. A method as claimed in claim 1 wherein the agent for controlling pH is selected from a group consisting of an agent that raises the pH and an agent that lowers the pH.5. A method as claimed in claim 4 wherein the agent for controlling pH is selected from a group consisting of magnesium oxide or hydroxide, calcium oxide or hydroxide, barium oxide or hydroxide, reactive calcium carbonate, sodium hydroxide, dolomitic lime, limestone, sulfuric acid, phosphoric acid, a mineral acid, or ferric sulfate, ferric chloride, aluminum sulfate and aluminum chloride.6. A method as claimed in claim 1 wherein the agent for adsorption-coprecipitation is selected from a group consisting of ferric sulfate, aluminum sulfate, activated alumina, and manganese dioxide.7. A method as claimed in claim 1 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation are the same agent.8. A method as claimed in claim 7 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation is potassium permanganate.9. A method as claimed in claim 1 wherein the agent for controlling pH and the agent for adsorption-coprecipitation are the same agent.10. A method as claimed in claim 9 wherein the agent for controlling pH and the agent for adsorption-coprecipitation is ferric sulfate.11. A method as claimed in claim 1 wherein at least two of the agents are ferric sulfate.12. A method as claimed in claim 1 wherein all three agents are ferric sulfate.13. A method as claimed in claim 1 wherein the agent for controlling oxidation-reduction potential of the water is potassium permanganate, the agent for controlling pH of the water is magnesium oxide, and the agent for adsorbing and coprecipitating the arsenic is ferric sulfate.14. A method as claimed in claim 1, wherein the treated pore water has a specific filtration resistance between 0.0175E8 and 17.5E8 sec2/g.15. A method as claimed in claim 14, wherein the treated pore water has a specific filtration resistance 1.75E8 sec2/g.16. 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. 17. A method as claimed in claim 16 wherein the agent for controlling oxidation-reduction potential is an oxidizing agent.18. A method as claimed in claim 17 wherein the agent for controlling oxidation-reduction potential is selected from a group consisting of potassium permanganate, sodium chlorate, sodium perchlorate, calcium chlorite or a chlorinated oxidizing agent, sodium percarbonate, sodium persulfate, sodium perborate, potassium persulfate, a peroxide compound, a compound of a multivalent element at its higher oxidation state, ferric sulfate, gaseous oxygen, and ozone.19. A method as claimed in claim 16 wherein the agent for controlling pH is selected from a group consisting of an agent that raises the pH and an agent that lowers the pH.20. A method as claimed in claim 17 wherein the agent for controlling pH is selected from a group consisting of magnesium oxide or hydroxide, calcium oxide or hydroxide, barium oxide or hydroxide, reactive calcium carbonate, sodium hydroxide, dolomitic lime, limestone, sulfuric acid, phosphoric acid, a mineral acid, or ferric sulfate, ferric chloride, aluminum sulfate and aluminum chloride.21. A method as claimed in claim 16 wherein the agent for adsorption-coprecipitation is selected from a group consisting of ferric sulfate, aluminum sulfate, activated alumina, and manganese dioxide.22. A method as claimed in claim 16 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation are the same agent.23. A method as claimed in claim 22 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation is potassium permanganate.24. A method as claimed in claim 16 wherein the agent for controlling pH and the agent for adsorption-coprecipitation are the same agent.25. A method as claimed in claim 24 wherein the agent for controlling pH and the agent for adsorption-coprecipitation is ferric sulfate.26. A method as claimed in claim 16 wherein at least two of the agents are ferric sulfate.27. A method as claimed in claim 16 wherein all three agents are ferric sulfate.28. A method as claimed in claim 16 wherein the agent for controlling oxidation-reduction potential of the pore water is potassium permanganate, the agent for controlling pH of the pore water is magnesium oxide, and the agent for adsorbing and coprecipitating the arsenic is ferric sulfate.29. A method as claimed in claim 16, wherein the treated pore water has a specific filtration resistance between 0.0175E8 and 17.5E8 sec2/g.30. A method as claimed in claim 29, wherein the treated pore water has a specific filtration resistance 1.75E8 sec2/g.31. 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. 32. A method as claimed in claim 31 wherein the agent for controlling oxidation-reduction potential is an oxidizing agent.33. A method as claimed in claim 32 wherein the agent for controlling oxidation-reduction potential is selected from a group consisting of potassium permanganate, sodium chlorate, sodium perchlorate, calcium chlorite or a chlorinated oxidizing agent, sodium percarbonate, sodium persulfate, sodium perborate, potassium persulfate, a peroxide compound, a compound of a multivalent element at its higher oxidation state, ferric sulfate, gaseous oxygen, and ozone.34. A method as claimed in claim 31 wherein the agent for controlling pH is selected from a group consisting of an agent that raises the pH and an agent that lowers the pH.35. A method as claimed in claim 34 wherein the agent for controlling pH is selected from a group consisting of magnesium oxide or hydroxide, calcium oxide or hydroxide, barium oxide or hydroxide, reactive calcium carbonate, sodium hydroxide, dolomitic lime, limestone, sulfuric acid, phosphoric acid, a mineral acid, or ferric sulfate, ferric chloride, aluminum sulfate and aluminum chloride.36. A method as claimed in claim 31 wherein the agent for adsorption-coprecipitation is selected from a group consisting of ferric sulfate, aluminum sulfate, activated alumina, and manganese dioxide.37. A method as claimed in claim 31 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation are the same agent.38. A method as claimed in claim 33 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation is potassium permanganate.39. A method as claimed in claim 31 wherein the agent for controlling pH and the agent for adsorption-coprecipitation are the same agent.40. A method as claimed in claim 39 wherein the agent for controlling pH and the agent for adsorption-coprecipitation is ferric sulfate.41. A method as claimed in claim 31 wherein at least two of the agents are ferric sulfate.42. A method as claimed in claim 31 wherein all three agents are ferric sulfate.43. A method as claimed in claim 31 wherein the agent for controlling oxidation-reduction potential of the liquid is potassium permanganate, the agent for controlling pH of the liquid is magnesium oxide, and the agent for adsorbing and coprecipitating the arsenic is ferric sulfate.44. A method as claimed in claim 31, wherein the mixing step further stabilizes antimony in pore water of the waste matrix.45. 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.46. A composition as claimed in claim 45 wherein the agent for controlling oxidation-reduction potential is an oxidizing agent.47. A composition as claimed in claim 46 wherein the agent for controlling oxidation-reduction potential is selected from a group consisting of potassium permanganate, sodium chlorate, sodium perchlorate, calcium chlorite, a chlorinated oxidizing agent, sodium percarbonate, sodium persulfate, sodium perborate, potassium persulfate, a peroxide compound, a compound of a multivalent element at its higher oxidation state, ferric sulfate, gaseous oxygen, and ozone.48. A composition as claimed in claim 45 wherein the agent for controlling pH is selected from a group consisting of an agent that raises the pH and an agent that lowers the pH.49. A composition as claimed in claim 47 wherein the agent for controlling pH is selected from a group consisting of magnesium oxide or hydroxide, calcium oxide or hydroxide, barium oxide or hydroxide, reactive calcium carbonate, sodium hydroxide, dolomitic lime, limestone, sulfuric acid, phosphoric acid, a mineral acid, or ferric sulfate, ferric chloride, aluminum sulfate and aluminum chloride.50. A composition as claimed in claim 46 wherein the agent for adsorption-coprecipitation is selected from a group consisting of ferric sulfate, aluminum sulfate, activated alumina, and manganese dioxide.51. A composition as claimed in claim 45 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation are the same agent.52. A composition as claimed in claim 51 wherein the agent for controlling oxidation-reduction potential and the agent for adsorption-coprecipitation is potassium permanganate.53. A composition as claimed in claim 45 wherein the agent for controlling pH and the agent for adsorption-coprecipitation are the same agent.54. A composition as claimed in claim 53 wherein the agent for controlling pH and the agent for adsorption-coprecipitation is ferric sulfate.55. A composition as claimed in claim 45 wherein at least two of the agents are ferric sulfate.56. A composition as claimed in claim 45 wherein all three agents are ferric sulfate.57. A composition as claimed in claim 45 wherein the agent for controlling oxidation-reduction potential of the matrix is potassium permanganate, the agent for controlling pH of the matrix is magnesium oxide, and the agent for adsorbing and coprecipitating the arsenic is ferric sulfate.58. A composition as claimed in claim 45, wherein the toxic metal is arsenic.59. A composition as claimed in claim 45, wherein the toxic metal is antimony.