Method and apparatus for separating oil from oil/water mixtures

Details Method and apparatus for separating oil from oil/water mixtures Method and apparatus for separating oil from oil/water mixtures

1990-12-19

1992-06-16

Silverman, Stanley S.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210800, 210805, 2105321, 210538, 210540, B10D 17032

Patent

active

051222809

ABSTRACT:
Disclosed is method and apparatus for separating a light liquid component from a heavier liquid component. A holding tank holding a mixture of the light and heavy liquid has an outlet discharging into a separation tank. An underflow weir is provided in a separation tank adjacent the point of discharge to direct outflow beneath the surface underflow weir and the light liquid rises to the surface on the downstream side of the underflow weir to concentrate in a small vertical column in a portion of the separation tank to form an upper layer. A sensor in the separation tank senses sufficient light liquid in the vertical column and operates a removal pump to remove the light liquid from the vertical column. With removal of the light liquid, heavy liquid rises and the sensor senses the heavy liquid and stops the light liquid removal before the heavy liquid is also removed. Heavy liquid from the separation tank is recirculated, being directed across the surface of the holding tank in a downstream direction.

REFERENCES:
patent: 2946443 (1960-07-01), Schmidt
patent: 3275565 (1966-09-01), Sailors
patent: 4608160 (1986-08-01), Zoch
patent: 4762614 (1988-08-01), Figiel et al.
patent: 4880533 (1989-11-01), Hondulas

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