Method and apparatus for treatment of oily waste
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United States of America Patent
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Feb 26, 1985
Grant Date -
N/A
app pub date -
Jan 3, 1984
filing date -
Jan 3, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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