Above Ground Oil Water Separators

Oil water separators are used to separate oils and solids from a variety of wastewater discharges. Above ground oil water separators will remove large quantities of free or mechanically emulsified oils from a waste stream. Our units can process oily wastewater at rates between 2 to 70 gallons per minute.

Ecologix oil water separators use parallel corrugated plate technology that causes oil droplets to increase in size, and separate more quickly. We offer a unique inclined plate design, called HD Q-PAC. The Q-PAC is made of a structure of interconnecting plates with many crossing points. As the oil/water mixture flows through the separator, new droplets coalesce with retained droplets and form larger droplets. The enlarged droplets rise to the surface and decant from the separator. All system designs meet or beat the guidelines of API-421 and ASTM-D19.31.11.4.

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Above Ground Oil Water Separator Design Features

• Stainless Steel construction
• Compact size
• No chemicals, absorbent, or filter cartridges
• 99.99% removal of free oil > 20 microns
• No moving parts
• No power consumption
• Meets EPA Method 413.2 and European Standard EN 858-1
• High surface area - 132 ft² per 1ft³

Process Illustration

Oil Water Separator Available Models (Flow rates based on oil at 0.9 specific gravity)

AGS Series (up to 20 gpm)

AGM Series (20-60gpm)

AG Series (3-2000gpm)

Above Ground Oil Water Separator Available Options

Sludge Hopper Option

Oil water separators designed with the sludge hopper option allow for the natural settling of heavy solids. The hopper has a port that can be connected to a sludge transfer pump.

Clean Water Sump Option

Oil water separators designed with the clean water sump allow for a float switch and submersible pump for pumping clean water into a different location.

Clean Water Sump & Sludge Hopper Option

Oil water separators can be built with both sludge hopper and clean water sump to perform multiple tasks in a single unit.

Oil Containment Chamber Option

Captured oil can be collected for resale or reuse. The optional oil containment compartment has an upper and lower port for pulling oil out of the holding chamber.

Oil Containment with Sight Glass Option

Oil water separators can be modified with sight glasses to allow for visual inspection of clean water sump and oil containment tank levels.

Fabrication

The above ground oil water separator is a special purpose, prefabricated, parallel-corrugated plate, rectangular, gravity displacement, type oil water separator. The separator is comprised of a tank containing an inlet compartment, separation chamber, sludge chamber, and clean water outlet chamber.

Tank

The tank is built of a single wall construction conforming to ASTM A240, type 304 stainless steel. Welds are in accordance with AWS D1.1 to provide a watertight tank that will not warp or deform under load.

Pipe Connections

All connections 3" and smaller are FNPT couplings. All connections 4" and larger are flat face flanges with ANSI 150 pound standard bolt circle. Use flanged piping connections that conform to ANSI B16.5.

Separator Corrosion Protection (for carbon steel models only)

After shop hydrostatic test has been successfully completed, a coating system is applied to the interior and exterior surfaces of the separator. Interiors and exteriors are sandblasted to SSPC-SP10 & SSPC-SP6; Interior lined with Tnemec Series 61 liner to 9 mils MDFT. Exterior coated with polyamide epoxy to 6 mils MDFT.

Lifting Lugs

The inlet chamber is comprised of a non-clog diffuser to distribute the flow across the width of the separation chamber. The inlet compartment is of sufficient volume to effectively reduce influent suspended solids, dissipate energy and begin separation. The media sits elevated on top of a sludge baffle. The sludge baffle is provided to retain settleable solids and sediment from entering the separation chamber.

Separation Chamber

The oil separation chamber contains HD Q-PAC Coalescing Media containing a minimum of 132 square feet per cubic foot of effective coalescing surface area. The medias needle like elements (plates) are placed at 90 degrees to the horizontal or longitudinal axis of the separator. Spacing between these elements are spaced 3/16" apart for the removal of a minimum of 99.9% of free droplets 40 micron in size or greater. The elements are positioned to create an angle of repose of 90 degrees to facilitate the removal of solids that may tend to build up on the coalescing surfaces, which would increase velocities to the point of discharging an unacceptable design flow rate shall be maintained throughout the separator packed bed including entrance and exit so as to prevent re-entrainment of oils with water. Flow, through the polypropylene coalescing media, is a cross-flow perpendicular to the vertical media elements such that all 132 square feet/cubic foot of coalescing media surfaces point upwards, so as not to be available for contact with the cross-flowing oily water. The media shall has a minimum void of 87% void volume to facilitate sludge and dirt particles as they fall off the vertical elements and settle in the sludge compartment. The media, when installed in cross-flow oil water separator, meets US EPA Method 413.2 and also European Standard 858-1 for oil water separators.

Baffles

An oil retention, underflow weir, and overflow weir are positioned to prevent re-suspension of settled solids.

Sludge Chamber

The sludge chamber is located prior to the coalescing compartment for the settling of any solids. It prevents any solids from entering the clean water chamber. Larger amounts of solids can be collected in a sludge hopper as an option.

Oil Skimmer

The oil separation chamber comes with a rotatable pipe skimmer for gravity decanting of the separated oil to an integral product storage tank or an external product storage tank.

Clean Water Chamber

The tank comes equipped with a clean water chamber which allows the water to leave the separator by pumped / gravity flow through the clean water outlet port.

Vents

1" vents are provided with vent piping to the atmosphere.