CPI OIL SEPARATOR

The Corrugated Plate Interceptor is an efficient separator which is designed to separate small quantities of finely divided oil from large volumes of water. The key to its efficiency is the closely spaced parallel corrugated plates in the path of the oily water. As oily water flows downward between the plates the lighter oil particles quickly rise to the underside of the plates where they combine into a continuous layer of oil which is further concentrated in the corrugations. The oil being lighter than water continues to rise until it reaches the underside of the vapor barrier. The oil is then skimmed off and returned to the processing systems.

OILY WATER PRIMARY
AND SECONDARY AIR

FLOTATION UNITS

This separator consists of a flotator tank and air pressurization and injection equipment. A portion of the treated effluent water is drawn off to a pump and pressurized in a retention vessel. Air is injected into the stream ahead of the vessel and is dissolved in the water after about a one minute retention. This water is then combined with the flotator feed. The reduction in pressure as the two streams combine causes the air to evolve in the form of small bubbles which attach themselves to oil droplets or suspended solids causing them to rise to the surface. The resulting frothy scum on the surface of the flotator tank is continuously removed by mechanical wiper blades. A similar scraper system on the bottom of the flotator tank removes heavy solids that drop to the floor.

SKIM BASINS AND CLEAR
WATER EFFLUENT CANAL

The skim basins differ from the CPI type separator in that they are longer and depend primarily on residence time and density difference for efficient separation. Each basin is equipped with special skim pipes for drawing off any accumulated oil and with an overflow weir and baffle arranged to draw off only clean water.

The clear water concrete trench shown in crosssection provides a reservoir before the next processing step. In addition this canal is equipped with overflow pipes which will permit water to flow in to the adjacent holding basin during severe rainstorms.