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U.S. EPA Superfund Innovative Technology
Evaluation (SITE) Program Low
Temperature Thermal Aeration (LTTAź)
Process Canonie Environmental Services, Inc.
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U.S. EPA Superfund Innovative Technology Evaluation
(SITE) Program Low Temperature Thermal Aeration (LTTAź) Process Canonie Environmental
Services, Inc. (1,092KB)
ABSTRACT
Canonie Environmental Services, Inc.'s Low Temperature Thermal Aeration (LTTAź)
Process thermally desorbs organic compounds from contaminated soil without heating
the soil to combustion temperatures. The technology removes organic contaminants
from contaminated soils into a contained air stream, which is extensively treated
to collect or thermally destroy the contaminants. A direct-fired rotary dryer
heats an air stream which, by direct contact, desorbs water and organic contaminants
from the soil. The process soil is quenched to reduce temperature and mitigate
dust problems. The processed soil is then discharged into a stockpile. The hot
air stream that contains vaporized water and organics is treated by one of two
air pollution control systems. One system removes the organic contaminants from
the air stream by adsorptoin on granular activated carbon (GAC) and includes
the following units in series: (1) cyclones and baghouse for particulate removal;
(2) wet scrubber for acid gas and some organic vapor removal; and (3) GAC adsorption
beds from organic removal. The transportable system consists of six major components
assembled on nine flat-bed trailers and five auxiliary support trailers. The
LTTAź system was demonstrated at a confidential abandoned pesticide mixing facility
in western Arizona in September 1992. During the demonstration, the LTTAź system
treated site soils contaminated primarily with seven pesticides: toxaphene;
4,4'-dichlorodiphenyltrichloroethane (DDT); 4,4'-dichlorodiphenyldichloroethane
(DDD); 4,4'-dichlorodiphenyldichloroethene (DDE); dieldrin; endosulfan I; and
endrin. Based upon the SITE demonstration, the LTTAź (1) can process a wide
variety of soils with differing moisture and contaminant concentrations; (2)
can remove VOCs from soil to below detection limits; (3) can substantially decrease
SVOC concentrations in soil; (4) can remove pesticides from soil to below or
near detection limits (removal efficiencies range from 82.4 to grater than 99.9
percent); and (5) did not produce dioxins and furans.
Posted March 30, 2000
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