Process for biodegradatioon of soil contaminants that contain vo

Details Process for biodegradatioon of soil contaminants that contain vo Process for biodegradatioon of soil contaminants that contain vo

1992-09-21

1994-07-05

Stoll, Robert L.

Chemistry: molecular biology and microbiology

Miscellaneous

4352625, C12M 104, C12M 106

Patent

active

H00013374

ABSTRACT:
A biodegradation apparatus comprising an enclosed vessel for holding a large volume of soil contaminated with hydrocarbons. Air diffusers uniformly within the vessel force moistened air through the vessel thereby removing volatile hydrocarbons from the contaminated soil. Outgoing air is supplied to vapor phase bioreactor for the removal of hydrocarbon contaminants from outgoing air. The outgoing air is next supplied to a granular activated carbon filter system which absorbs remaining hydrocarbons and then expels non-polluted air into the atmosphere concluding phase one treatment of the hydrocarbon contaminated soil. Phase two treatment of the hydrocarbon contaminated soil is initiated by utilizing high pressure injection nozzles to force water with surfactant additives through the soil thereby forming at the upper portion of the enclosed vessel a supernatant which includes hydrocarbon contaminants. The supernatant is next provided to a settling tank that collects oily sludge at the bottom thereof and then to a treatment tank where nutrients are added to promote biological growth for biodegradation of the remaining hydrocarbon contaminants.

REFERENCES:
patent: 4662900 (1987-05-01), Ottengraf
patent: 4962034 (1990-10-01), Khan
patent: 5017289 (1991-05-01), Ely et al.
patent: 5057227 (1991-10-01), Cohen
patent: 5059252 (1991-10-01), Renfro
patent: 5080782 (1992-01-01), Caplan et al.
patent: 5120160 (1992-06-01), Schwengel
Leson et al., "Biofiltration: An Innovative Air Pollution Control Technol for VOC Emissions", J. Air Waste Manage. Ass., vol. 41, (Aug. 1991), pp. 1045-1053.
R. E. Hoeppel, "Biodegradation for On-Site Remediation of Contaminated Soils and Groundwater at Navy Sites", Military Engineer, Aug. 1989, vol. 81; pp. 31-36.

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