The separation process of oil-water sludge in centrifugal field was analyzed,and the expression of sedimentation height and float height for dispersed phase and centripetal substance were deduced by dynamic equation and granularity distribution function.

The current situation of oil-water sludge,the movement rule of and the forces on the solid impurity particles,oil drops and water of the oil-water sludge in centrifugal force field were introduced,and relevant physical models were established.

Oil-water sludge had the characteristics of good emulsification oil-water,strong adhesion of oily sludge and small relative gravity in oil-water sludge which was difficult to directly separate crude oil from oil-water sludge.

This paper analyzes the necessity and the economic advantage of the treatment of sludge from oil tank based on the characteristics of the sludge, and introduces native and foreign technologies for the treatment of oil-sludge, the homemade complete set of equipment, the treatment scheme and the results of the experiment on the industrial treatment of sludge carried out by the authors.