Abstract
To improve the efficiency of bioremediation of soils contaminated simultaneously with oil and highly mineralized waste oilfield waters, salt-resistant hydrocarbon-oxidizing bacteria should be used. In a model experiment, the effect of pollution with oil (5%) and NaCl (1 and 3%) and their combinations, as well as bioaugmentation with the halotolerant destructor strain Pseudomonas songnenensis UOM 4 on the hydrocarbon content and enzyme activity of leached chernozem was studied. Bacterization increased oil degradation by 26.9% in oily soil and by 31.8 and 27.6% in complex contaminated soil (with 1 and 3% NaCl, respectively). In the presence of pollutants, the activity of soil enzymes decreased. The introduction of microorganisms led to a certain increase in the level of catalase in oil-contaminated soil, restored urease reactivity in oil-containing soil and under the combined action of pollutants, and increased invertase activity under combined pollution.
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