Model for Treatment of Trichloroethylene by Methanotrophic Biofilms

A biofilm model for the cometabolic degradation of trichloroethylene (TCE) by methane oxidizing (methanotrophic) bacteria is derived. Methane utilization and TCE transformation were modeled using diffusive mass transport, Monod kinetics, competitive inhibition, TCE transformation product toxicity, a...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 1994, Vol.120 (2), p.379-400
Main Authors: Anderson, James E, McCarty, Perry L
Format: Article
Language:English
Subjects:
540220 - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology
BACTERIA
BIODEGRADATION
Biodegradation of pollutants
Biological and medical sciences
Biotechnology
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DECOMPOSITION
Environment and pollution
ENVIRONMENTAL SCIENCES
Fundamental and applied biological sciences. Psychology
GROWTH
HALOGENATED ALIPHATIC HYDROCARBONS
Industrial applications and implications. Economical aspects
MATHEMATICAL MODELS
METHANOTROPHIC BACTERIA
MICROORGANISMS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT
REMEDIAL ACTION
TECHNICAL PAPERS
TECHNOLOGY ASSESSMENT
TOXICITY
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Description
Summary:A biofilm model for the cometabolic degradation of trichloroethylene (TCE) by methane oxidizing (methanotrophic) bacteria is derived. Methane utilization and TCE transformation were modeled using diffusive mass transport, Monod kinetics, competitive inhibition, TCE transformation product toxicity, and growth, decay and inactivation of the methanotrophic bacteria. Reported low rates of TCE degradation by biofilms were found to be compatible with the high rates found in dispersed growth studies. The slower rates result from phenomena inherent in biofilms, and not necessarily from a difference in performance characteristics of the organisms. The possibility that biofilms may not be copper-limited is also considered. Other model predictions include an optimum methane concentration that maximizes TCE flux. Also, survival of a biofilm should only occur when the methane concentration is above a certain minimum value (Smin), which is linearly related to TCE concentration. The model is general and can be applied to other primary substrates and chlorinated aliphatic hydrocarbons (CAHs).
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(1994)120:2(379)