Abstract
Phenanthrene and methyl-phenanthrenes are major aromatic pollutants originating in particular from fuel oil. Phenanthrene is usually degraded faster than methyl-phenanthrenes under geological and environmental conditions. Here, we report a preferential and accelerated biodegradation of methyl-phenanthrenes versus phenanthrene in soil contaminated by fuel oil. The polluted soil was mixed with sawdust and sand to form a homogenized biopile. The biopile was continuously sprayed with microbial consortia isolated from crude oil–contaminated soil and treated by biosurfactants and nutritive substances for biostimulation. During a 6-month bioremediation experiment, a steady increase in the relative abundance of phenanthrene compared to methyl-phenathrenes was observed by gas chromatography–mass spectrometry. The increase was the highest for trimethyl-phenanthrenes, with a phenanthrene/trimethyl-phenanthrenes ratio increasing from 0.42 to 2.45. By contrast, the control, non-stimulated samples showed a ratio decrease from 0.85 to 0.11. Moreover, the results showed that the level of degradability depends on the number of methyl groups.
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We thank the Ministry of Education and Science of the Republic of Serbia (Projects 176006 & III 43004) for supporting this research.
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Novaković, M., Ramadan, M.M.A., Knudsen, T.Š. et al. Degradation of methyl-phenanthrene isomers during bioremediation of soil contaminated by residual fuel oil. Environ Chem Lett 10, 287–294 (2012). https://doi.org/10.1007/s10311-012-0354-6
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DOI: https://doi.org/10.1007/s10311-012-0354-6