TY JOUR TI ON ASSESSING THE EFFECTIVENESS OF THE PROCESS OF FILTRATION OF USED MOTOR OILS THROUGH GRANULAR PARTITIONS KW fficiency KW filtration process KW used motor oil KW bulk filters KW filter material KW dirt holding capacity KW coarseness grain shape KW porosity KW filtration speed JO Vestnik of Omsk SAU AU MALTSEVA, E.I. PY 2024 IS 56 PB FSBEI HE Omsk SAU