Oxidative particle mixtures for groundwater treatment

• US 6,102,621 A
• Filed: 05/01/1998
• Issued: 08/15/2000
• Est. Priority Date: 05/01/1998
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Inventors: Siegrist, Robert L., Murdoch, Lawrence C.
• Primary Examiner(s): Taylor, Dennis L.
• Application Number:
  US09/071,659
• Time in Patent Office: 837 Days
• Field of Search: 405/128, 405/129, 405/263, 405/266, 588/249, 588/252, 588/259, 106/287.35, 106/611
• US Class Current: 405/128.5
• CPC Class Codes: B09C 1/00 Reclamation of contaminated soil
• CPC Class Codes: B09C 1/002 involving in-situ ground water treatment
• CPC Class Codes: B09C 1/08 chemically
• CPC Class Codes: B09C 2101/00 In situ

Abstract

The invention is a method and a composition of a mixture for degradation and immobilization of contaminants in soil and groundwater. The oxidative particle mixture and method includes providing a material having a minimal volume of free water, mixing at least one inorganic oxidative chemical in a granular form with a carrier fluid containing a fine grained inorganic hydrophilic compound and injecting the resulting mixture into the subsurface. The granular form of the inorganic oxidative chemical dissolves within the areas of injection, and the oxidative ions move by diffusion and/or advection, therefore extending the treatment zone over a wider area than the injection area. The organic contaminants in the soil and groundwater are degraded by the oxidative ions, which form solid byproducts that can sorb significant amounts of inorganic contaminants, metals, and radionuclides for in situ treatment and immobilization of contaminants. The method and composition of the oxidative particle mixture for long-term treatment and immobilization of contaminants in soil and groundwater provides for a reduction in toxicity of contaminants in a subsurface area of contamination without the need for continued injection of treatment material, or for movement of the contaminants, or without the need for continuous pumping of groundwater through the treatment zone, or removal of groundwater from the subsurface area of contamination.

Claims

1. A method for the treatment of contaminants within soil and groundwater comprising the steps of:

providing at least one inorganic oxidative chemical in

a granular form;

adding a carrier fluid to said oxidative chemical, said

carrier fluid further comprising a fine grained

inorganic hydrophilic material;

mixing said oxidative chemical with said carrier fluid, thereby providing a mixture;

injecting said mixture into an injection zone in the subsurface area;

dissolving said granular form of said at least one inorganic oxidative chemical in the subsurface area;

generating a plurality of oxidative ions from said dissolving step;

dispersing passively said plurality of oxidative ions;

reacting said contaminants with said plurality of oxidative ions.

2. The method as described by claim 1, wherein said hydrophilic material further comprises at least one material selected from the group consisting of Portland cement, bentonite clay, kaolinte, clay minerals, silicate, cement, and calcium cement compounds.

3. The method as described by claim 1, wherein said at least one inorganic oxidative chemical in granular form is selected from the group consisting of KMnO4, NaMnO4, calcium persulfate, magnesium percarbonate, permanganate compounds, and percarbonate compounds.

4. The method as described by claim 1, wherein said granular form of said inorganic oxidative chemical further comprises a grain size of less than about 5 millimeters.

5. The method as described by claim 1, wherein the step of providing said mixture further comprises a mixture having no more than approximately 3% free water by weight.

6. The method as described by claim 1, wherein the step of injecting further comprises emplacement of said mixture into the subsurface by a method selected from the group consisting essentially of coring, trenching, pressurized injection, hydraulic fracturing, and jet grouting, mechanical soil mixing, and pumping of said mixture.

7. The method as described by claim 1, wherein the step of dispersing passively further comprises diffusion and advection.

8. The method as described by claim 1, wherein the step of reacting further comprises degrading organic components of said contaminants into mineralized compounds within the subsurface.

9. The method as described by claim 1, wherein the step of reacting further comprises forming a plurality of amorphous particles of about 1 to about 5 microns in size, said plurality of amorphous particles contained within the subsurface.

10. The method as described by claim 1, wherein the step of reacting further comprises sorption of contaminants on a surface of solid by-products generated within the subsurface.

11. A method for treatment and immobilization of contaminants within soil and water comprising the steps of:

providing at least one inorganic oxidative chemical

having a granular form;

adding a carrier fluid to said oxidative chemical, said carrier fluid further comprising a fine-grained inorganic hydrophilic material;

mixing said oxidative chemical with said carrier fluid,

thereby providing a thixotropic mixture;

injecting said mixture into the subsurface;

dissolving said at least one inorganic oxidative chemical into said soil and water;

generating a plurality of oxidative ions from said oxidative chemical;

passively moving said plurality of oxidative ions toward said contaminants without the movement of water;

reacting organic members of said contaminants with said plurality of oxidative ions; and

forming a plurality of solid reaction by-products from said reacting step, said plurality of solid by-products remaining within said soil and groundwater.

12. The method as described by claim 11, comprising the additional step of reacting said solid by-products with metal and radionuclide members of said contaminants.

13. The method as described by claim 11, wherein the step of passively moving said plurality of oxidative ions further comprises moving said oxidative ions by diffusion and advection to and through said contaminants in soil and groundwater.

14. The method as described by claim 11, wherein said hydrophilic material further comprises at least one material selected from the group consisting of Portland cement, bentonite clay, kaolinte, clay minerals, silicate cement compounds, and calcium cement compounds.

15. The method as described by claim 11, wherein said at least one inorganic oxidative chemical in granular form is selected from the group consisting of KMnO4, NaMnO4, calcium persulfate, magnesium percarbonate, and permanganate compounds.

16. The method as described by claim 11, wherein said granular form of said inorganic oxidative chemical has a grain size of less than about 5 millimeters.

17. The method as described by claim 11, wherein the step of providing said thixotropic mixture further a mixture having no more than approximately 3% free water by weight.

18. The method as described by claim 11, wherein the step of injecting further comprises emplacement of said mixture into the subsurface by a method selected from the group consisting essentially of coring, trenching, pressurized injection, hydraulic fracturing, and jet grouting, mechanical soil mixing, and pumping of said mixture.

19. The method as described by claim 11, wherein the step of passively moving said oxidative ions further comprises diffusion and capillary advection.

20. The method as described by claim 11, wherein the step of reacting further comprises degrading organic components of said contaminants into mineralized compounds within the subsurface.

21. The method as described by claim 11, wherein the step of forming a plurality of solid by-products further comprises forming a plurality of amorphous particles of about 1 to about 5 microns in size, said plurality of amorphous particles retained within the subsurface region.

22. A method of treating excavated soil and groundwater comprising:

providing at least one inorganic oxidative chemical having a granular form;

adding a carrier fluid to said oxidative chemical, said carrier fluid further comprising a fine-grained inorganic hydrophilic material;

mixing said oxidative chemical with said carrier fluid, thereby providing a thixotropic mixture;

injecting said mixture into the excavated soil;

dissolving said at least one inorganic oxidative chemical into said soil and water;

generating a plurality of oxidative ions from said oxidative chemical;

reacting organic members of said contaminants with said plurality of oxidative ions; and

forming a plurality of solid reaction by-products from said reacting step, said plurality of solid by-products remaining within said soil and groundwater.