Combined UV-biological degradation of PAHs |
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Authors: | Guieysse Benoit Viklund Gunilla Toes Ann-Charlotte Mattiasson Bo |
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Affiliation: | Department of Biotechnology, Lund University, P.O. Box 124, S-221 00, Lund, Sweden |
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Abstract: | The UV-photolysis of PAHs was tested in silicone oil and tetradecane. In most cases, the degradation of a pollutant provided within a mixture was lower than when provided alone due to competitive effects. With the exception of anthracene, the larger pollutants (4- and 5-rings) were always degraded first, proving that UV-treatment preferentially acts on large PAHs and thereby provides a good complement to microbial degradation. UV-photolysis was also found to be suitable for treatment of soil extract from contaminated soils. The feasibility of UV-biological treatment was demonstrated for the removal of a mixture of phenanthrene and pyrene in silicone oil. UV-irradiation of the silicone oil led to 83% pyrene removal but no phenanthrene photodegradation. Subsequent treatment of the oil in a two-phases partitioning bioreactor (TPPB) system inoculated with Pseudomonas sp. was followed by complete phenanthrene biodegradation but no further pyrene removal. Totally, the combined process allowed 92% removal of the PAH mixture. Further work should focus on characterizing the photoproducts formed and studying the influence of the solvent on the photodegradation process. |
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Keywords: | Author Keywords: Photolysis Photodegradation Biodegradation Two-phase partitioning bioreactor Biphasic |
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