FIELD: microbiological industry. SUBSTANCE: invention relates to the strain of bacterium Rhodococcus sp. VKM Ac-1232D. Strain added to aerotank at amount 1-2% of total active silt content decreases the silt index to 60 ml/g, suspended substances in purified water - to 15 mg/l. Effectiveness of treatment is increased to 97.2%. New bacterial strain can be used for biological treatment of sewage in petroleum chemical production. Bacterial strain is resistant to toxic pollutions. EFFECT: enhanced effectiveness of treatment. 1 tbl
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