PURPOSE: To separate and recover efficiently the oil component contained in oil slurry from said slurry by removing a solid component from the oil slurry with a solid-liquid separator, then treating the slurry with a centrifugal separator and heating the slurry to remove water and adding finally activated clay, etc. thereto and filtering the slurry.
CONSTITUTION: The oil slurry consisting of a mixture of oil, water and sludge formed as industrial waste is pumped from a storage tank I into the 1st heating tank II where the slurry is heated to about 50°C to decrease the viscosity. The heated slurry is subjected to a solid-liquid sepn. in a screw decanter III. The oil slurry from which the solid component is removed is heated to about 70°C in the 2nd heating tank IV and thereafter the slurry is treated in a disc type centrifugal separator V to remove mainly the non-emulsified water. The slurry is further heated to at least 105°C, more preferably ≥110°C in the 3rd heating tank IV, to evaporate the water to dry. A filter aid, such as activated clay, is added to the treated oil slurry in a mixing tank VII and the slurry is finally filtered in a filter press VIII, whereby the regenerated oil having the quality equivalent to the quality of "B" heavy fuel oil is recovered.
UMEMURA HIDETOSHI
YAMANAKA MASAMI
OKADA SUMIO
KYOHO SEISAKUSHO KK