Method for removing contaminants from soil

Details Method for removing contaminants from soil Method for removing contaminants from soil

1993-04-22

1994-08-23

Dean, Richard

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 12, 134 251, 134 26, 134109, 134110, 134111, 210634, 405128, B08B 300, B08B 304, B08B 308, B08B 310

Patent

active

053404068

ABSTRACT:
A method and apparatus for removing contaminants from soil by a closed-loop, counter-current extraction process is disclosed. The process involves a preliminary water removal step, followed by a counter-current leaching of the contaminants from the soil by an extraction solvent in one or more extraction vessels. The extraction solvent is preferably 2-methyl-2-propanol and is continuously recycled.

REFERENCES:
patent: 4606774 (1986-08-01), Morris
patent: 4662948 (1987-05-01), Weitzman
patent: 4793931 (1988-12-01), Stevens et al.
patent: 4801384 (1989-01-01), Steiner

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