Related Experiment Videos
Multisubstrate biodegradation kinetics for binary and complex mixtures of polycyclic aromatic hydrocarbons.
Christopher D Knightes1, Catherine A Peters
1Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Environmental Toxicology and Chemistry
|July 13, 2006
Summary
Biodegradation of polycyclic aromatic hydrocarbons (PAHs) in mixtures is complex. A model including competitive inhibition accurately predicted enhanced biodegradation, unlike simpler models.
Area of Science:
- Environmental Science
- Biochemistry
- Chemical Engineering
Background:
- Polycyclic Aromatic Hydrocarbons (PAHs) are persistent organic pollutants.
- Understanding PAH biodegradation kinetics in mixtures is crucial for environmental remediation.
- Sole-substrate models often fail to predict complex mixture behavior.
Purpose of the Study:
- To investigate biodegradation kinetics of nine PAHs in binary and complex mixtures.
- To compare observed rates with predictions from sole-substrate and multisubstrate models.
- To evaluate the predictive accuracy of models with and without competitive inhibition.
Main Methods:
- Studied biodegradation kinetics of nine PAHs in various mixtures.
- Utilized predictive multisubstrate models, including one with competitive inhibition.
- Determined model parameters from independent sole-substrate experiments.
Main Results:
- Observed biodegradation rates differed significantly from sole-substrate model predictions.
- Biodegradation was enhanced for most PAHs, primarily due to biomass enhancement from naphthalene.
- Multisubstrate model with inhibition provided more accurate predictions than the model without inhibition.
Conclusions:
- Sole-substrate models are inadequate for predicting multisubstrate PAH biodegradation.
- Multisubstrate models incorporating competitive inhibition are recommended for modeling PAH mixtures.
- Enzyme pathway similarities support the use of inhibition-inclusive models for PAH biodegradation.