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Title: Bench-scale treatability study simulation of in situ ambient air and steam stripping of volatile organic compounds from saturated soils

Abstract

An equipment manufacturing facility discharged solvent wastes consisting of acetone, methyl ethyl ketone, trichloroethene, methylene chloride, and other volatile organic compounds (VOCs) into an unlined earthen pit for evaporation of the solvents. The total VOC concentration in groundwater around this site ranges from 600 mg/l to 8,000 mg/l. In-place volatilization using an auger soil mixing and air injection system has been selected as part of an integrated remedial approach for removal of VOCs from the soils and groundwater. In-situ ambient air and hot air/steam stripping of volatile organics from saturated soil were simulated in the laboratory using soils from the contaminated site. The studies were performed using a mini auger system at Clemson Technical Center. The primary objectives of the studies were to: (1) determine the amount of each of the four VOCs that can be removed from saturated soil when treated by ambient air and by steam stripping using a bench-scale unit that simulates in situ treatment, (2) measure the amount of volatile organic in the off gas stream by collecting grab samples, and (3) determine the correlation between off gas concentrations and residual soil concentrations for use in monitoring. Reductions in soil concentrations of 95 to 100% weremore » obtained after 12 cycles using ambient air. For steam/hot air stripping, only 7 and 1/2 cycles were required to meet a comparable treatment level. In both types of treatment, the water soluble compounds were more difficult to remove. There was a rough correlation between the off gas concentration and the residual soil concentration for the four spikes. The ratio varied significantly over the course of treatment, so the off gas concentration should only be used as an approximate indicator of residual soil concentrations.« less

Authors:
;  [1]
  1. RUST Federal Services, Anderson, SC (United States)
Publication Date:
OSTI Identifier:
210391
Report Number(s):
CONF-9509139-
TRN: 95:008324-0239
Resource Type:
Conference
Resource Relation:
Conference: 7. ACS special symposium: emerging technologies in hazardous waste management, Atlanta, GA (United States), 17-20 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Emerging technologies in hazardous waste management VII; Tedder, D.W. [ed.]; PB: 1352 p.
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SOILS; DECONTAMINATION; STEAM STRIPPING; EFFICIENCY; ORGANIC COMPOUNDS; REMOVAL; SOLVENTS; BENCH-SCALE EXPERIMENTS; GROUND WATER

Citation Formats

Hoeffner, S L, and Baggott, B. Bench-scale treatability study simulation of in situ ambient air and steam stripping of volatile organic compounds from saturated soils. United States: N. p., 1995. Web.
Hoeffner, S L, & Baggott, B. Bench-scale treatability study simulation of in situ ambient air and steam stripping of volatile organic compounds from saturated soils. United States.
Hoeffner, S L, and Baggott, B. Sun . "Bench-scale treatability study simulation of in situ ambient air and steam stripping of volatile organic compounds from saturated soils". United States.
@article{osti_210391,
title = {Bench-scale treatability study simulation of in situ ambient air and steam stripping of volatile organic compounds from saturated soils},
author = {Hoeffner, S L and Baggott, B},
abstractNote = {An equipment manufacturing facility discharged solvent wastes consisting of acetone, methyl ethyl ketone, trichloroethene, methylene chloride, and other volatile organic compounds (VOCs) into an unlined earthen pit for evaporation of the solvents. The total VOC concentration in groundwater around this site ranges from 600 mg/l to 8,000 mg/l. In-place volatilization using an auger soil mixing and air injection system has been selected as part of an integrated remedial approach for removal of VOCs from the soils and groundwater. In-situ ambient air and hot air/steam stripping of volatile organics from saturated soil were simulated in the laboratory using soils from the contaminated site. The studies were performed using a mini auger system at Clemson Technical Center. The primary objectives of the studies were to: (1) determine the amount of each of the four VOCs that can be removed from saturated soil when treated by ambient air and by steam stripping using a bench-scale unit that simulates in situ treatment, (2) measure the amount of volatile organic in the off gas stream by collecting grab samples, and (3) determine the correlation between off gas concentrations and residual soil concentrations for use in monitoring. Reductions in soil concentrations of 95 to 100% were obtained after 12 cycles using ambient air. For steam/hot air stripping, only 7 and 1/2 cycles were required to meet a comparable treatment level. In both types of treatment, the water soluble compounds were more difficult to remove. There was a rough correlation between the off gas concentration and the residual soil concentration for the four spikes. The ratio varied significantly over the course of treatment, so the off gas concentration should only be used as an approximate indicator of residual soil concentrations.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {12}
}

Conference:
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