Method and apparatus for treatment of oil contaminated sludge
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United States of America Patent
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-
Mar 14, 1989
Grant Date -
N/A
app pub date -
Feb 10, 1987
filing date -
Feb 10, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Oil containing sludges are treated for the recovery of oil therefrom to render the resultant sludge disposable, by a process of conditioning the sludge to destabilize the emulsified phase thereof, centrifuging the destabilized sludge to obtain a solids-rich material which is largely hydrocarbon free and disposable, and a supernatant, hydrocarbon-containing liquid, and then subjecting the supernatant so formed to liquid/liquid phase separation. The conditioning is conducted so as to prepare a conditioned sludge characterized by a solids content of less than 50% by weight, a water content of less than 90% by weight, an oil phase with an API gravity of less than 12.degree., a continuous aqueous phase, and the solids in the sludge being primarily water wetted, this conditioned sludge being ready for centrifugation.
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