Dissolved Air Flotation

Watermark Projects offer a range of products and services but our expertise lies in our Dissolved Air Flotation systems which are designed and manufactured in-house.

As well as our bespoke systems, the Watermark Projects team have developed our range of skid mounted units, specifically designed to accommodate flow rates from 3,000 to 30,000 Litres of wastewater per hour with varying solids, offering reductions of up to 80% in COD and over 98% in suspended solids. All of our DAF units are manufactured in T304 stainless steel and incorporate the highest quality instrumentation.

Watermark DAF Systems

Bespoke (up to 200,000 Litres per hour)

Model 6 (up to 9,000 Litres per hour)

Model 20 (up to 30,000 Litres per hour)



Not sure if the DAF system is right for your effluent? Contact the Watermark Projects team today to arrange a free, no obligation site visit which includes a wastewater sample analysis, feasibility study & return on investment report – Contact us!

How does the Dissolved Air Flotation process work?

The Dissolved Air Flotation treatment process is specifically designed for the efficient removal of COD, suspended solids, fats, oils and greases from the effluent stream. The system utilises extremely fine air bubbles, also known as ‘White Water’, which attach themselves to the suspended material within the waste stream, increasing buoyancy and floating them to the surface. The floated solids are then removed by a simple but effective scraper mechanism. More often than not chemical conditioning is used to increase the effectiveness of the Dissolved Air Flotation process.

The Watermark Dissolved Air Flotation process uses the most reliable and positive method of producing air bubbles of the optimum size. This is done by dissolving air into water under pressure and then dropping the pressure on entry to the DAF cell using a controlled nozzle orifice. As the pressure is reduced, the air naturally comes out of solution in the form of micro bubbles.

  • Bespoke

    As part of a larger engineering group Watermark Projects are able to offer completely bespoke Dissolved Air Flotation systems. These units can be specifically designed to include additional pre/post treatment, work alongside existing systems and to accommodate space restricted sites.

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  • Model 6

    The Watermark Projects Model 6 Dissolved Air Flotation unit is a compact, skid mounted system capable of effectively treating up to 9,000 Litres of wastewater per hour.

    The Model 6 is also available for trial & feasibility studies.

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  • Model 20

    The Watermark Projects team developed the Model 20 DAF unit to offer a complete system to suit a range of industries. The Model 20 is capable of effectively treating up to 30,000 Litres of wastewater per hour and is completely skid mounted.


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