Apparatus and method for thermally stripping volatile organic compounds from soil using a recirculating combustible gas

Patent · Tue Jul 20 00:00:00 EDT 1993

OSTI ID:6336516

Crosby, R A; Crosby, J L

A method is described for removing volatile organic compounds from sod, comprising the steps of: (a) loading said soil into an opening in a drum; (b) transporting said soil into said drum by rotating said drum in a first direction; (c) flowing a hot gas through said drum; (d) mechanically causing said hot gas to come into contact with said soil, thereby volatilizing said volatile organic compounds into said hot gas; (e) exhausting said hot gas after said hot gas has flowed through said drum; (f) introducing air into said exhausted gas; (g) combusting said exhausted gas after said introduction of said air therein; (h) recirculating at least a portion of said combusted gas to said drum; (i) repeating steps (c)-(h); and (j) discharging said soil from said drum through said opening -by rotating said drum in a second direction. An apparatus for removing volatile organic compounds from soil, comprising: (a) a drum for holding a predetermined quantity of said soil; (b) gas transporting means, in flow communication with said drum, for directing a hot gas into said drum and for discharging said hot gas from said drum and for recirculating said discharged gas back into said drum; (c) an auger mechanism disposed in said drum, said auger mechanism having means for grinding and churning said soil when said auger mechanism is rotated in a first direction, thereby volatilizing said volatile organic compounds and entraining particles of said soil into said hot gas directed into said drum, and means for transporting said soil out of said drum when said auger mechanism is rotated in a second direction; and (d) means, in flow communication with said gas transporting means, for removing particles from said gas discharging from said drum.

• Assignee: IMS; EDB-93-109213
• Patent Number(s): US 5228803; A
• Application Number: PPN: US 7-728094
• OSTI ID: 6336516
• Resource Relation: Patent File Date: 10 Jul 1991
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ORGANIC COMPOUNDS
MATERIALS RECOVERY
SOILS
DECONTAMINATION
GAS INJECTION
HEAT TRANSFER
IN-SITU PROCESSING
PYROLYSIS
REMEDIAL ACTION
VOLATILE MATTER
CHEMICAL REACTIONS
CLEANING
DECOMPOSITION
ENERGY TRANSFER
FLUID INJECTION
MANAGEMENT
MATTER
PROCESSING
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)