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Title
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Evolution of bacterial community during bioremediation of PAHs in a coal tar contaminated soil
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Author
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Abstract
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| The monitoring of a windrow treatment applied to soil contaminated by mostly 2-, 3- and 4-ring PAHs produced by coal tar distillation was performed by following the evolution of both PAH concentration and the bacterial community. Total and PAH-degrading bacterial community structures were followed by 16S rRNA PCRDGGE in parallel with quantification by bacterial counts and 16 PAH measurements. Six months of biological treatment led to a strong decrease in 2-, 3- and 4-ring PAH concentrations (98, 97 and 82% respectively). This result was associated with the activity of bacterial PAH-degraders belonging mainly to the Gamma-proteobacteria, in particular, the Enterobacteria and Pseudomonas genera, which were detected over the course of the treatment. This group was considered to be a good bioindicator to determine the potential PAH biodegradation of contaminated soil. Conversely, other species, like the Beta-proteobacteria, were detected after 3 months, when 2-, 3- and 4-ring PAHs were almost completely degraded. Thus, presence of the Beta-proteobacteria group could be considered a good candidate indicator to estimate the endpoint of biotreatment of this type of PAH-contaminated soil. |
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Language
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English
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Source (journal)
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Chemosphere. - Oxford, 1972, currens
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Publication
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Oxford
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2010
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ISSN
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0045-6535
[print]
1879-1298
[online]
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DOI
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10.1016/J.CHEMOSPHERE.2010.09.021
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Volume/pages
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81
:10
(2010)
, p. 1263-1271
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ISI
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000284670900013
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Full text (Publisher's DOI)
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