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Dissolved Air Flotation

Siltbuster operates the largest hire fleet of Dissolved Air Flotation (DAF) units within the UK, all of which are available for both temporary projects or permanent applications. Rapid mobilisation of equipment allows us to respond quickly to urgent requirements.


Applications of Dissolved Air Flotation

DAF units are specifically designed to remove suspended solids which are buoyant in nature (or exhibit near neutral buoyancy) or which have a propensity to float under certain conditions. These can include fats, oils and greases (FOGs), organic matter, algae, etc contained in water or wastewater originating from processes such as:

  • Food and Drinks production (e.g. dairy, ready meals/sauces, canned foods, fruit and vegetables, whisky and other alcoholic beverages)
  • Industrial manufacturing (e.g. chemical plants, pharmaceuticals, paper mills)
  • Municipal wastewater treatment
  • Potable water treatment
  • Environmental remediation works

In many of these applications, the removal of any COD associated with the solids removed is also a key benefit, aiding compliance with discharge consents, helping to reduce Mogden charges and/or reducing biological load on downstream processes.


DAF water treatment – how does it work?
The DAF unit creates ‘white-water’ by dissolving air under pressure and then releasing it to form micro-fine air bubbles in a continuous process. These fine bubbles attach themselves onto the suspended solids within the incoming process flow (which sometimes requires chemical conditioning with a coagulant and flocculant) , and rise to the surface, enabling the solids to thicken and dewater, before being removed by a top mounted scraper mechanism. Siltbuster’s dissolved air flotation design also incorporates lamella plate technology to maximise the hydraulic separation area, thus allowing far greater hydraulic throughput within a compact footprint. The plates also allow for co-current and counter flotation which maximises the reduction of suspended solids across the unit.

Advantages of using DAF water treatment

  • Proven, widely used technology with many applications
  • Low running cost
  • Easily maintained, minimal moving parts
  • Works with/without chemical dosing depending upon application
  • Small, compact footprint
  • Packaged / mobile design to facilitate ease of transport and set up


The SPS Range of DAF units
SPS have the UK’s largest and most varied fleet of DAF units available for hire as well as supplying permanent installs. Our modular, mobile, plug-and-play systems are ready for rapid deployment and commissioning onsite. This responsiveness and flexibility helps our customers with seasonal peaks in demand, planned and emergency works upgrades, contingency planning, temporary treatment and site resilience works.

All our systems are supplied pre-packaged with a white-water system that does not require compressed air, reducing the power consumption/running costs, saving space and reducing the noise.

The range of units available allows different options to be considered according to the application, with unit flow rates ranging from 1m3/hr up to 100m3/hr (or higher, depending on application) and the flexibility to run units in parallel as well. We have a team of engineers covering all areas of the UK and an in-house laboratory and expertise enabling us to analyse samples to find the best water treatment solution for your needs.

The robust stainless steel chains and housing for the rubber scrapers minimises the risk of breaking and ensures that the sludge is removed from the DAF as needed, whilst the use of stainless steel in the whitewater system provides a dependable and safe way of creating the whitewater required. A drain valve at the bottom of the DAF basin is periodically opened to allow any settled solids to leave the DAF, ensuring the unit is working at its optimum capacity.


Additional Options
SPS supply a site specific complete treatment solution which may also include:

  • Walkways & access platforms
  • Feed pumps
  • Flow meters
  • Control panels
  • Automatic, flow proportional single or multi-stage chemical dosing systems
  • pH control systems
  • Fully containerised dosing systems
  • Pipe flocculators or Flocculation tanks
  • Sludge pumps and sludge storage tanks
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