FIELD: petroleum processing. SUBSTANCE: sludge is processed at 40-110 C by extraction with nonvolatile solvent at solvent to sludge hydrocarbons ratio (0.1-3): 1. Resultant solid residue is washed and wash water is then directed into biooxidation process. According to invention, washing is performed with floatable liquid formed in biooxidation stage or directly with culture broth at ratio (2-15):1, respectively. EFFECT: intensified processing of sludge due to acceleration of biological processes. 5 cl, 2 dwg, 4 tbl, 4 ex
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