—Gravity / API Separators

• —Original treatment method

• —Large tank with high res. Time

• —Simple design, no moving parts, relatively cheap.

• —Large vessels, ineffective with small oil droplets, requires long res. Time to get efficient separation​​

—Gas Floatation methods

• —Various technologies available to impart fine gas bubbles into water to lift out oil/solid particles

• —High  oil removal efficiency, can handle wide range/ fluctuating inlet conc’s

• —Generally requires gas supply, required chemicals for enhanced performance

—Filtration methods

• —Various filtration technologies available from simple cartridge type, activated carbon, media bed (anthracite etc.) and Walnut Shell

• —Very high oil removal efficiency, can handle wide range/ fluctuating inlet concentrations

• —Problem with media disposal or regeneration, large complex systems for large flow rates

Hydrocyclones

• —Uses hydrodynamic cyclonic effect to generate high g-forces to separate phases efficiently in a very short residence time.

• —High oil removal efficiency, compact equipment, in-sensitive to external motion

• —Requires high pressure drop for efficient operation, requires steady inlet flow/conditions