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Degradation of methyl-phenanthrene isomers during bioremediation of soil contaminated by residual fuel oil |
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| Authors: | Milan Novakovi? Muftah Mohamed Ali Ramadan Tatjana ?olevi? Knudsen Mali?a Anti? Vladimir Be?koski Gordana Gojgi?-Cvijovi? Miroslav M Vrvi? Branimir Jovan?i?evi? |
| Institution: | 1. Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, P.O. Box 158, 11001, Belgrade, Serbia 2. Center of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njego?eva 12, P.O. Box 473, 11001, Belgrade, Serbia 3. Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11081, Belgrade, Serbia |
| 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?Ccontaminated 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?Cmass 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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