TY JOUR TI THE DESTRUCTION OF OIL EMULSION WASTEWATER WITH HARD DEMULSIFIERS AND THE USE OF WASTE SLUDGE IN PRODUCTION OF CERAMIC MATERIALS KW demulsifier KW oil-containing emulsion waste water KW sorption-filtration treatment KW oil sludge KW ceramic materials JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Gracheva, E.O. AU Shevaga, O.N. AU Tarasova, G.I. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov