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In-situ subsurface decontamination of sodic soil, clay and ground water

  • US 9,475,106 B2
  • Filed: 05/11/2012
  • Issued: 10/25/2016
  • Est. Priority Date: 05/11/2011
  • Status: Active Grant
First Claim
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1. A method of reducing sodicity in soil or clay, the soil or clay having an initial sodicity above a predetermined acceptable level as measured by the sodium adsorption ratio (SAR) of the soil or clay, and the soil or clay containing organic contaminants and a metal compound, the method comprising:

  • (a) treating the soil or clay with an effective amount of an alkaline aqueous solution having a pH of at least 7 and comprising an alkaline buffering agent, calcium and/or magnesium peroxide, and a chelating agent, for a time sufficient to have the chelating agent chelate the metal of the metal compound;

    (b) reacting the calcium and/or magnesium peroxide with water to produce calcium and/or magnesium cations;

    (c) penetrating the soil or clay with gasses to diffuse the alkaline aqueous solution into the soil or clay and generate additional reaction; and

    (d) contacting the soil or clay with the alkaline aqueous solution for a time sufficient to cause the chelating agent to chelate the calcium and/or magnesium cations produced in step (b) and hold them in solution, the chelating agent chelating a sufficient amount of the calcium and/or magnesium cations in order to cause sodium cations to become dislodged from a matrix of the soil or clay into solution and to reduce the sodicity as measured by the sodium adsorption ratio of the soil or clay below the predetermined acceptable level.

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