A harmless treatment technology for separation and
recovery of oily
sludge comprises the following steps: 1, conveying the oily
sludge to a high
solid content treatment device, carrying out preliminary screening on large granule impurities in the oily
sludge, and conditioning the sludge; 2, conveying pre-conditioned oily sludge to a three-phase
centrifuge, and separating oil, water and mud in the oily sludge; 3, conveying the obtained separated liquid to an oil-water separation device, and further carrying out oil and water separation; 4, inputting the obtained
oil phase to an
oil storage tank, and inputting water to an
oily wastewater advanced
treatment system; 5, conveying the obtained
solid phase sludge transported to a
thermal desorption device, and carrying out heating curing separation and condensation oil-water separation in a
thermal desorption treatment process; and 6, conveying water output by the oil-water separation device and water output by the
thermal desorption device to the
oily wastewater advanced
treatment system, and carrying out advanced oil-water separation. The method has the advantages of low cost oily sludge treatment cost, convenient maintenance and management, high efficiency and good stability.