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Birwelco has a longstanding history of specialised expertise in wastewater treatment plant design, with a dedicated division dedicated to this field. Our current team at Birwelco not only benefits from the legacy of past Birwelco contracts but also brings a wealth of experience gained through their collaborations with other prominent employers within the wastewater treatment sector.



A water tank


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  • —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

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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

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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

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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​​

Typical Equipment Packages


Birwelco, Trinity Point, Halesowen, Birmingham, B63 3HY



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