 The denser liquid, usually water, accumulates at the periphery of the rotating container and is collected from the side of the device, whereas the less dense liquid, usually oil, accumulates at the rotation axis and is collected from the center.Centrifugal oil-water separators are used for waste water processing and for cleanup of oil spills on sea or on lake.Centrifugal oil-water separators are also used for filtering diesel and lubricating oils by removing the waste particles and impurity from them.