In-situ restoration of contaminated soils and groundwater using

Details In-situ restoration of contaminated soils and groundwater using In-situ restoration of contaminated soils and groundwater using

1992-04-16

1994-01-04

Spear, Frank

Liquid purification or separation

Processes

Ion exchange or selective sorption

210688, 210170, B01D 1500

Patent

active

052757390

ABSTRACT:
A method for stabilizing in-situ soluble heavy metal contaminants in carbonate-containing land or submarine formations which comprises introducing into the carbonate-containing formation an aqueous solution of calcium chloride, wherein the solution contains a stabilizing amount of calcium ions. The contaminants and the carbonate form coprecipitates with the calcium ions which are insoluble in formation fluids, therefore substantially inhibiting the remobilization of the heavy metals with groundwater. The method is effective with heavy metals which exist in both anionic and cationic form in carbonate-containing land or submarine formations. The method may be used to treat land formations hundreds of feet below the surface, landfill deposits, or submarine formations to reduce soluble heavy metal contaminants to a few parts per million.

REFERENCES:
patent: 3950179 (1976-04-01), Schneider
patent: 4156658 (1979-05-01), Mercer, Jr. et al.
patent: 4336142 (1982-06-01), Bye
patent: 4354942 (1982-10-01), Kaczur et al.
patent: 4418961 (1983-12-01), Strom et al.
patent: 4615643 (1986-10-01), Gouvenot
patent: 4888053 (1989-12-01), Grayson et al.
patent: 4909849 (1990-03-01), Funderburk
patent: 4950409 (1990-08-01), Stanforth
patent: 4981394 (1991-01-01), McLaren et al.
patent: 4997313 (1991-03-01), Gibson et al.
patent: 5013453 (1991-05-01), Walker
Handbook on In Situ Treatment of Hazardous Waste Contaminated Soils, EPA/540/2-90/002, Jan. 1990.

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