Alfa Laval Inc.

The De Laval Separator Company

Graydon C Bazell

Oily waste is separated by gravity settling into a light oil phase forming an upper layer and a heavy phase forming a lower layer. An overflow stream of oil passes from the upper layer to a raw fuel storage tank while an underflow from the lower layer, after addition of diesel oil, is centrifugally separated into a light component of oil with some water which is returned to the gravity settling, an intermediate component of clarified water which is discharged to a sewer, and a heavy sludge component which is fed to a second centrifuge for separation into substantially dry solids and a mixture of water and residual oil which is returned to the gravity settling.

Method and apparatus for treatment of oily waste

A stream of wax-containing crude oil is passed through a heating zone which heats it sufficiently to melt the wax and is then passed through a rapid cooling zone where it is cooled to a temperature below the freezing point of the wax but sufficiently rapdily to prevent solidification of the wax. The cooled oil is then subjected promptly to further treatment while the wax is still in liquid condition in the oil at a temperature below said freezing point. The further treatment preferably includes passing a mixture of the cooled oil and wash water through a centrifuge and there separating the wash water from the oil while retaining the wax in the washed oil discharged from the centrifuge.

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Poughkeepsie, NY, United States of America

Graydon C Bazell