TY JOUR TI PURIFICATION OF FUEL OIL-CONTAINING BOILER WASTEWATER IN A HYDROCYCLONE-FILTERING UNIT KW FUEL OIL-CONTAINING WASTEWATER KW BOILER HOUSE KW UNIT KW PROCESS FLOW CHART KW PETROLEUM PRODUCTS KW PURIFICATION JO Herald of Technological University AU Busarev, A.V. AU Selyugin, A.S. AU , .. PY 2025 IS 27 PB Kazan National Research Technological University