TY JOUR TI MODERN TECHNOLOGIES OF OIL SLUDGE PROCESSING KW oil sludge KW disposal KW methods KW pollution KW equipment KW petroleum processing waste JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Petrovskiy, E.A. AU Solov'ev, E.A. AU Kolenchukov, O.A. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov