Low-temperature soil treatment
- ABB Environmental Services, Inc., Portland, ME (United States)
Remedial technologies were reviewed and a pilot test was completed to address soil and groundwater contamination at a former chemical recycling/recovery facility. Results from the remedial investigation indicated that the site soils and groundwater were impacted by chlorinated and non-chlorinated volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from former site operations. ABB-ES evaluated three applicable remedial technologies against the two threshold criteria and seven balancing criteria suggested by the USEPA. The three technologies were in situ soil vapor extraction (SVE), exsitu SVE, and low-temperature thermal desorption. The pilot test was performed using a combination of thermal and vapor extraction technology, referred to as thermally enhanced vapor extraction (TEVE). The onsite pilot test included construction of a soil stack with 700 cubic yards (1,000 tons) of impacted soil excavated from the site. The base of the 9-foot soil stack was 93 feet by 35 feet, with the top of the stack was 72 feet by 32 feet. Ducting was laid throughout the stack to introduce a heated air stream and to collect the contaminants entrained in the effluent air stream. The stack was covered to provide a closed system and to prevent short-circuiting of the air flow. Air temperatures ranged from 300 F to 375 F (149 C--191 C) while soil temperatures ranged from 111 C to 356 F (44 C--180 C) during the test period. The test period lasted for 161 hours (approximately four days). Pre-treatment soil concentrations of total VOCs ranged from 30-50,000 g/kg. Post-treatment concentrations of total VOCs ranged from 10-14,000 g/kg. Results from the pilot test indicated that the optimum treatment period to reach regulatory limits during full-scale treatment was four days.
- OSTI ID:
- 353685
- Report Number(s):
- CONF-970677-; TRN: IM9929%%231
- Resource Relation:
- Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
- Country of Publication:
- United States
- Language:
- English
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