Patent ID: 9475106
Filing Date: 2016-10-25
CPC Classification: B09C,C02F

Claim Text:
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.