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Partially oxidized polycyclic aromatic hydrocarbons show an increased bioavailability and biodegradability
R Meulenberg1, H H Rijnaarts, H J Doddema
1TNO Institute of Environmental Sciences, Department of Environmental Biotechnology, Delft, The Netherlands.
FEMS Microbiology Letters
|July 1, 1997
Summary
Polycyclic aromatic hydrocarbons (PAHs) are persistent pollutants. White rot fungi partially degrade PAHs, making them more accessible for bacteria to fully break down, enhancing bioremediation.
Area of Science:
- Environmental Science
- Microbiology
- Bioremediation
Background:
- Polycyclic aromatic hydrocarbons (PAHs) exhibit low water solubility and strong soil adsorption, hindering effective bioremediation.
- Many microorganisms partially oxidize PAHs, limiting complete degradation and pollutant removal.
Purpose of the Study:
- To investigate the efficacy of a sequential bioremediation approach using white rot fungi and indigenous bacteria for PAH removal.
- To assess the enhanced bioavailability and mineralization of PAH metabolites compared to parent compounds.
Main Methods:
- Utilized white rot fungi for the initial partial oxidation of PAHs.
- Employed natural mixed bacterial cultures (activated sludge, soil) for the subsequent mineralization of PAH metabolites.
Main Results:
- White rot fungi converted PAHs into more water-soluble and bioavailable intermediate products.
- PAH metabolites were mineralized more readily by indigenous bacterial communities than the original PAH compounds.
- Demonstrated a synergistic effect in the sequential degradation pathway.
Conclusions:
- A sequential bioremediation strategy involving white rot fungi followed by indigenous bacteria significantly enhances PAH removal efficiency.
- This combined approach offers a promising solution for the effective bioremediation of PAH-contaminated environments.
- Metabolite-driven degradation is key to overcoming the limitations of direct PAH mineralization by bacteria.