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Title: CHARACTERIZING SOIL/WATER SORPTION AND DESORPTION BEHAVIOR OF BTEX AND PAHS USING SELECTIVE SUPERCRITICAL FLUID EXTRACTION (SFE)

Abstract

The first goal of the proposed study was to generate initial data to determine the ability of selective SFE behavior to mimic the soil/water sorption and desorption behavior of BTEX (benzene, toluene, and xylenes) and PAHs (polycyclic aromatic hydrocarbons).Samples generated by Professor Bill Rixey's column sorption studies (aged for 2 weeks to 8 months) and desorption studies (six weeks desorption of the aged soil columns with pure water) were extracted using sequentially-stronger SFE conditions to selectively remove different fractions of each BTEX and PAH component which range from loosely to tightly bound in the soil matrices. The selective SFE results parallel the sorption/desorption leaching behavior and mechanisms determined by Professor Rixey's investigations (under separate funding) using water desorption of soil columns previously aged with BTEX and PAHs. These results justify more intensive investigations of the use of selective SFE to mimic soil/water sorption and desorption of organic pollutants related to fossil fuels which will be performed under separate funding. The second goal of the study was to determine if selective SFE extraction behavior parallels the remediation behavior displayed by PAHs currently undergoing in-situ bioremediation at a manufactured gas plant (MGP) site. Based on soil analyses of several individual PAHs (asmore » well as total PAHs) before remediation began, and after 147 days of remediation, selective SFE successfully mimicked remediation behavior. These results strongly support the use of selective SFE to predict remediation behavior of soils contaminated with PAHs, and are expected to provide a powerful and rapid analytical tool which will be useful for determining the remediation endpoints which are necessary for environmental protection. Based on the initial success found in the present study, additional investigations into the use of SFE for predicting and monitoring the remediation behavior of PAH-contaminated soils will be performed under separate funding.« less

Authors:
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
791039
Report Number(s):
FC21-93MC30098-56
TRN: US200203%%332
DOE Contract Number:  
FC21-93MC30098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 30 Sep 1998
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; AROMATICS; BENZENE; DESORPTION; FOSSIL FUELS; LEACHING; MATRICES; MONITORING; POLLUTANTS; SOILS; SORPTION; TOLUENE; WATER; XYLENES

Citation Formats

Hawthorne, Steve. CHARACTERIZING SOIL/WATER SORPTION AND DESORPTION BEHAVIOR OF BTEX AND PAHS USING SELECTIVE SUPERCRITICAL FLUID EXTRACTION (SFE). United States: N. p., 1998. Web. doi:10.2172/791039.
Hawthorne, Steve. CHARACTERIZING SOIL/WATER SORPTION AND DESORPTION BEHAVIOR OF BTEX AND PAHS USING SELECTIVE SUPERCRITICAL FLUID EXTRACTION (SFE). United States. https://doi.org/10.2172/791039
Hawthorne, Steve. Wed . "CHARACTERIZING SOIL/WATER SORPTION AND DESORPTION BEHAVIOR OF BTEX AND PAHS USING SELECTIVE SUPERCRITICAL FLUID EXTRACTION (SFE)". United States. https://doi.org/10.2172/791039. https://www.osti.gov/servlets/purl/791039.
@article{osti_791039,
title = {CHARACTERIZING SOIL/WATER SORPTION AND DESORPTION BEHAVIOR OF BTEX AND PAHS USING SELECTIVE SUPERCRITICAL FLUID EXTRACTION (SFE)},
author = {Hawthorne, Steve},
abstractNote = {The first goal of the proposed study was to generate initial data to determine the ability of selective SFE behavior to mimic the soil/water sorption and desorption behavior of BTEX (benzene, toluene, and xylenes) and PAHs (polycyclic aromatic hydrocarbons).Samples generated by Professor Bill Rixey's column sorption studies (aged for 2 weeks to 8 months) and desorption studies (six weeks desorption of the aged soil columns with pure water) were extracted using sequentially-stronger SFE conditions to selectively remove different fractions of each BTEX and PAH component which range from loosely to tightly bound in the soil matrices. The selective SFE results parallel the sorption/desorption leaching behavior and mechanisms determined by Professor Rixey's investigations (under separate funding) using water desorption of soil columns previously aged with BTEX and PAHs. These results justify more intensive investigations of the use of selective SFE to mimic soil/water sorption and desorption of organic pollutants related to fossil fuels which will be performed under separate funding. The second goal of the study was to determine if selective SFE extraction behavior parallels the remediation behavior displayed by PAHs currently undergoing in-situ bioremediation at a manufactured gas plant (MGP) site. Based on soil analyses of several individual PAHs (as well as total PAHs) before remediation began, and after 147 days of remediation, selective SFE successfully mimicked remediation behavior. These results strongly support the use of selective SFE to predict remediation behavior of soils contaminated with PAHs, and are expected to provide a powerful and rapid analytical tool which will be useful for determining the remediation endpoints which are necessary for environmental protection. Based on the initial success found in the present study, additional investigations into the use of SFE for predicting and monitoring the remediation behavior of PAH-contaminated soils will be performed under separate funding.},
doi = {10.2172/791039},
url = {https://www.osti.gov/biblio/791039}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {9}
}