Effect of rhizospheric oil-degrading bacteria on the biological state of oil-polluted soil
M.S. Tretyakova, L.A. Belovezhets, L.G. Sokolova, S.Yu. Zorina, Yu.A. Markova
Section: Remediation and rehabilitation
Environmental pollution with oil and oil products is a serious issue faced both by Russia and by the whole world. Currently, the use of microbiological preparations, which include indigenous microorganisms adapted to climatic and environmental conditions of a particular region, is an effective way to remediate oil-polluted soils. The use of microorganisms isolated from plant rhizosphere is promising for soil bioremediation due to their high biotechnological potential. The paper presents the results of model experiments on the influence of strains of oil-degrading microorganisms (Rhodococcus erytropolis 108, Acinetobacter guillouiae 112, Acinetobacter guillouiae 114) isolated from wheatgrass rhizosphere and their consortium on the purification of oil-polluted soil. The indicators of soil phytotoxicity, change in its enzymatic and respiratory activity. After 60 days of the experiment, the oil loss in oil-polluted soil with the introduction of the studied strains was shown to increase by 19-24% relative to the control and amount to 62-68% of its initial content. The enzymatic and respiratory activity of the soil increased against the background of oil destruction by the microorganisms. Treatment of oil-polluted soil with the strains of oil-degrading bacteria contributed to an increase in its phytotoxicity in the early stages of radish (Raphanus sativus) ontogeny. This was especially characteristic of the A. guillouiae 112 strain. The soil inoculated with R. erytropolis 108 had the least phytotoxicity throughout the experiment. For the first time, the obtained rhizospheric strains of the genera Rhodococcus and Acinetobacter were shown to accelerate the process of purifying the soil from oil and be able to be used for bioremediation of oil-polluted soils.
ISSN 1995-4301
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