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Title: Stimulation of the reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by the addition of toluene

Abstract

Chlorinated solvents are among the most common industrial contaminants of groundwater. Tetrachloroethene (PCE) is resistant to aerobic biodegradation; however, it is occasionally reductively dechlorinated in anoxic contaminated aquifers (2, 3). This is particularly true if the subsurface also contains other organic compounds that can serve as electron donors and whose utilization by subsurface bacteria will deplete the available oxygen. Certain alkylbenzenes, such as toluene, could potentially serve as electron donors for the reductive dechlorination of PCE. Field studies conducted by this laboratory have suggested that this may indeed be occurring at field sites exposed to both alkylbenzenes and chlorinated solvents. In this study, the biologically mediated interactions of toluene and PCE under anaerobic conditions were investigated by using microcosms constructed with aquifer solids from an area that was exposed to both alkylbenzenes and chlorinated ethenes at the US Coast Guard Air Station, in Traverse City, Michigan. The results of this study indicate that toluene can act as an initial source of reducing potential for the reductive dechlorination of chloroethenes under anaerobic conditions. Also, the cultivation of this consortium from a site impacted by alkylbenzenes and chloroethenes is an indication that this process may occur in contaminated aquifers.

Authors:
 [1];  [2]
  1. Environmental Protection Agency, Ada, OK (United States)
  2. NSI Technology Services Corp., Ada, OK (United States)
Publication Date:
OSTI Identifier:
5121379
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology; (United States)
Additional Journal Information:
Journal Volume: 25:5; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AQUIFERS; DECONTAMINATION; CHLORINATED ALIPHATIC HYDROCARBONS; DECHLORINATION; ANAEROBIC CONDITIONS; BINDING ENERGY; ELECTRONS; FLUORESCENCE SPECTROSCOPY; GAS CHROMATOGRAPHY; LIQUID COLUMN CHROMATOGRAPHY; METHANE; MICROCOSMS; MICROSCOPY; PH VALUE; REACTION INTERMEDIATES; REDUCTION; SODIUM SULFIDES; SUBSURFACE ENVIRONMENTS; TOLUENE; VALENCE; ALKALI METAL COMPOUNDS; ALKANES; ALKYLATED AROMATICS; AROMATICS; CHALCOGENIDES; CHEMICAL REACTIONS; CHROMATOGRAPHY; CLEANING; DEHALOGENATION; ELEMENTARY PARTICLES; EMISSION SPECTROSCOPY; ENERGY; FERMIONS; HALOGENATED ALIPHATIC HYDROCARBONS; HYDROCARBONS; LEPTONS; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; SEPARATION PROCESSES; SODIUM COMPOUNDS; SPECTROSCOPY; SULFIDES; SULFUR COMPOUNDS; 540220* - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Sewell, G W, and Gibson, S A. Stimulation of the reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by the addition of toluene. United States: N. p., 1991. Web. doi:10.1021/es00017a024.
Sewell, G W, & Gibson, S A. Stimulation of the reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by the addition of toluene. United States. doi:10.1021/es00017a024.
Sewell, G W, and Gibson, S A. Wed . "Stimulation of the reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by the addition of toluene". United States. doi:10.1021/es00017a024.
@article{osti_5121379,
title = {Stimulation of the reductive dechlorination of tetrachloroethene in anaerobic aquifer microcosms by the addition of toluene},
author = {Sewell, G W and Gibson, S A},
abstractNote = {Chlorinated solvents are among the most common industrial contaminants of groundwater. Tetrachloroethene (PCE) is resistant to aerobic biodegradation; however, it is occasionally reductively dechlorinated in anoxic contaminated aquifers (2, 3). This is particularly true if the subsurface also contains other organic compounds that can serve as electron donors and whose utilization by subsurface bacteria will deplete the available oxygen. Certain alkylbenzenes, such as toluene, could potentially serve as electron donors for the reductive dechlorination of PCE. Field studies conducted by this laboratory have suggested that this may indeed be occurring at field sites exposed to both alkylbenzenes and chlorinated solvents. In this study, the biologically mediated interactions of toluene and PCE under anaerobic conditions were investigated by using microcosms constructed with aquifer solids from an area that was exposed to both alkylbenzenes and chlorinated ethenes at the US Coast Guard Air Station, in Traverse City, Michigan. The results of this study indicate that toluene can act as an initial source of reducing potential for the reductive dechlorination of chloroethenes under anaerobic conditions. Also, the cultivation of this consortium from a site impacted by alkylbenzenes and chloroethenes is an indication that this process may occur in contaminated aquifers.},
doi = {10.1021/es00017a024},
journal = {Environmental Science and Technology; (United States)},
issn = {0013-936X},
number = ,
volume = 25:5,
place = {United States},
year = {1991},
month = {5}
}