Dissolved Air Flotation

At the forefront of the Watermark Projects product range are our Dissolved Air Flotation systems which are designed and manufactured in-house.

The Watermark Projects DAF systems are designed to offer a complete wastewater treatment solution with on board chemical mixing vessels, dilute polymer make-up system, complete PLC control panel, pH control and level controllers for automatic operation.

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)






                               Rental                                                                                     Trial                                                            Manufactured in-house



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.