Cleaning and liquid contact with solids – Processes – Including use of vacuum – suction – or inert atmosphere
Patent
1989-10-27
1991-01-15
Pal, Asok
Cleaning and liquid contact with solids
Processes
Including use of vacuum, suction, or inert atmosphere
15320, 15321, 166 60, 166 651, 134 1, 134 42, 405129, B08B 1300, B08B 1500
Patent
active
049845942
ABSTRACT:
An in-situ method is disclosed for removing contaminants from surface and near-surface soil by imposing a vacuum on the soil beneath a impermeable flexible sheet and then heating the soil with an electric surface heater that is positioned on the soil surface under the sheet. The heater is permeable to vapors which emanate from the soil when heated. A permeable mat, which may also be a good thermal insulator, separates the heater from the impermeable sheet and provides a conduit for flow of vapors to openings in the sheet. The openings, in turn, are connected to a vacuum manifold for collection of the vapors. A vacuum pump evacuates the region under the impermeable sheet such that the sheet, mat, and heater are pressed firmly against the soil surface by atomospheric pressure. The soil contaminants are removed by vaporization, steam distillation, and/or thermal decomposition.
REFERENCES:
patent: 4670634 (1987-06-01), Bridges et al.
patent: 4774974 (1988-10-01), Teter
patent: 4807318 (1989-02-01), Kallenbach
U.S. News and World Report, Feb. 6, 1989, pp. 47-49, Superfund, Superflop.
Stegemeier George L.
Vinegar Harold J.
Pal Asok
Shell Oil Company
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