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The article studies the topic of oil-containing wastes generated in oil production and refining and having a significant negative impact on the environment. The problem is that only a small amount of oil-containing wastes is currently processed with the help of technologies. To prevent environmental pollution and threats to public health, enterprises need to take measures to neutralize and reduce the hazard class of oily waste for oil storage facilities and distribution depots. The paper presents the case of terminal sludge collectors in Arkhangelsk, situated in the northern part of the Russian Federation. The authors give the rationale for reducing the hazard class of oil-containing wastes, slurry cards stored for long periods at the Arkhangelsk oil transshipment complex. A technology for lowering the hazardous class of oily waste is suggested. It includes several stages and implies the division of oil sludge into layers and splitting the treatment process into phases. The waste disposal treatment consists of dosage, heating, mixing of the solid phase of the waste with organic substances, preparation and heat treatment of mixtures. The application of the method allows for the neutralization and cure of oil-contaminated materials with optimal energy consumption and the use of domestic commercially available equipment. [ABSTRACT FROM AUTHOR]