Oil-oxidizing Microorganisms, Promising For Bioremediation Of Oil-polluted Soils Of Kazakhstan | 17246
Journal of Biotechnology & Biomaterials
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Soil pollution with oil is one of the most pressing problems in Kazakhstan. Oil-polluted soils are in need of bioremediation.
The eight most active strains of oil-oxidizing microorganisms were isolated and sampled from oil-polluted soils in Southern
Kazakhstan. They utilized up to 58.3-72.5% of oil over 14 days. On the basis of genetic analysis by sequencing of 16S RNA gene
fragments, these strains were allocated to the genera
Gordonia, Dietzia, Rhodococcus, Microbacterium
associations of oil-oxidizing microorganisms have been developed which were capable of active oxidizing oil hydrocarbons.
In the model laboratory experiments, it was shown that under their introduction in soil artificially polluted with 5% of oil, the
purification efficiency made up 61.7-77.2%, while with 10% pollution was of 55.4-65.2% over two months. Two of the most
effective associations were tested in the oil test facility, where the pollution exceeded the average rate. The test results revealed
that under these conditions the destruction of oil came to 61% and 73.9 %. Two months following their introduction into the
oil-polluted soil, an increase in the number of most groups of soil microflora took place, primarily hydrocarbon-oxidizing
microorganisms. Their number increased by four orders of magnitude (from 102to 106 cells/g). At the same time, an increase
in catalase and dehydrogenase activities was recorded.
Svetlana Aitkeldiyeva is the head of the Department of Microbiology, Institute of microbiology and virology. She has completed her PhD in 1984 and postdoctoral
studies in 2002. She has published 12 papers in international journals, and is the author more than 30 patents. Her scientific interests are following: Ecology of
microorganisms, bioremediation of oil-polluted ecosystems, learning the processes of metals biocorrosion and working-out microbiological methods to protect metal
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