Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1990-03-09
1990-11-27
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Chemical
166311, 405263, 405128, E02D 300
Patent
active
049732013
ABSTRACT:
Surface layers of the earth contaminated with precipitates of alkaline earth metal sulfates including radium sulfate derived from subterranean waters brought to the surface of the earth, are decontaminated using an aqueous chemical composition including a polyaminopolycarboxylic acid such as ETDA or DTPA in combination with a synergist, preferably oxalate or monocarboxylic acid anion such as salicylate. The surface layers may be decontaminated in situ by applying the solvent to the earth to bring the precipitates into dissolved form after which the dissolved precipitates are leached into lower layers of the earth by percolation with water. Alternatively, the earth may be removed from its original site and decontaminated in a tank or lined pond after which the decontaminated earth may be returned to its approximate original site.
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Paul James M.
Wilson Peggy M.
Corbin David H.
Keen Malcolm D.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
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