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Title: Kinetics of trichloroethylene cometabolism and toluene biodegradation: Model application to soil batch experiments

Abstract

Trichloroethylene (TCE) biodegradation in soil under aerobic conditions requires the presence of another compound, such as toluene, to support growth of microbial populations and enzyme induction. The biodegradation kinetics of TCE and toluene were examined by conducting three groups of experiments in soil: toluene only, toluene combined with low TCE concentrations, and toluene with TCE concentrations similar to or higher than toluene. The biodegradation of TCE and toluene and their interrelationships were modeled using a combination of several biodegradation functions. In the model, the pollutants were described as existing in the solid, liquid, and gas phases of soil, with biodegradation occurring only in the liquid phase. The distribution of the chemicals between the solid and liquid phase was described by a linear sorption isotherm, whereas liquid-vapor partitioning was described by Henry's law. Results from 12 experiments with toluene only could be described by a single set of kinetic parameters. The same set of parameters could describe toluene degradation in 10 experiments where low TCE concentrations were present. From these 10 experiments a set of parameters describing TCE cometabolism induced by toluene also was obtained. The complete set of parameters was used to describe the biodegradation of both compounds in 15more » additional experiments, where significant TCE toxicity and inhibition effects were expected. Toluene parameters were similar to values reported for pure culture systems. Parameters describing the interaction of TCE with toluene and biomass were different from reported values for pure cultures, suggesting that the presence of soil may have affected the cometabolic ability of the indigenous soil microbial populations.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Envirogen, Inc., Lawrenceville, NJ (US)
OSTI Identifier:
20080424
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Quality
Additional Journal Information:
Journal Volume: 29; Journal Issue: 3; Other Information: PBD: May-Jun 2000; Journal ID: ISSN 0047-2425
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; SOILS; BIODEGRADATION; REMEDIAL ACTION; CHLORINATED ALIPHATIC HYDROCARBONS; TOLUENE; SYNERGISM; PHASE STUDIES

Citation Formats

El-Farhan, Y.H., Scow, K.M., Fan, S., and Rolston, D.E. Kinetics of trichloroethylene cometabolism and toluene biodegradation: Model application to soil batch experiments. United States: N. p., 2000. Web. doi:10.2134/jeq2000.00472425002900030013x.
El-Farhan, Y.H., Scow, K.M., Fan, S., & Rolston, D.E. Kinetics of trichloroethylene cometabolism and toluene biodegradation: Model application to soil batch experiments. United States. doi:10.2134/jeq2000.00472425002900030013x.
El-Farhan, Y.H., Scow, K.M., Fan, S., and Rolston, D.E. Thu . "Kinetics of trichloroethylene cometabolism and toluene biodegradation: Model application to soil batch experiments". United States. doi:10.2134/jeq2000.00472425002900030013x.
@article{osti_20080424,
title = {Kinetics of trichloroethylene cometabolism and toluene biodegradation: Model application to soil batch experiments},
author = {El-Farhan, Y.H. and Scow, K.M. and Fan, S. and Rolston, D.E.},
abstractNote = {Trichloroethylene (TCE) biodegradation in soil under aerobic conditions requires the presence of another compound, such as toluene, to support growth of microbial populations and enzyme induction. The biodegradation kinetics of TCE and toluene were examined by conducting three groups of experiments in soil: toluene only, toluene combined with low TCE concentrations, and toluene with TCE concentrations similar to or higher than toluene. The biodegradation of TCE and toluene and their interrelationships were modeled using a combination of several biodegradation functions. In the model, the pollutants were described as existing in the solid, liquid, and gas phases of soil, with biodegradation occurring only in the liquid phase. The distribution of the chemicals between the solid and liquid phase was described by a linear sorption isotherm, whereas liquid-vapor partitioning was described by Henry's law. Results from 12 experiments with toluene only could be described by a single set of kinetic parameters. The same set of parameters could describe toluene degradation in 10 experiments where low TCE concentrations were present. From these 10 experiments a set of parameters describing TCE cometabolism induced by toluene also was obtained. The complete set of parameters was used to describe the biodegradation of both compounds in 15 additional experiments, where significant TCE toxicity and inhibition effects were expected. Toluene parameters were similar to values reported for pure culture systems. Parameters describing the interaction of TCE with toluene and biomass were different from reported values for pure cultures, suggesting that the presence of soil may have affected the cometabolic ability of the indigenous soil microbial populations.},
doi = {10.2134/jeq2000.00472425002900030013x},
journal = {Journal of Environmental Quality},
issn = {0047-2425},
number = 3,
volume = 29,
place = {United States},
year = {2000},
month = {6}
}