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Skip Navigation LinksEvoqua Water Technologies > en > Brands > Environmental Treatment Systems > Dissolved Air Flotation (DAF) Systems

 Contact Product Expert

Doug O'Halloran
Product Manager
719-550-2105

Dissolved Air Flotation (DAF) Systems

Dissolved air flotation made simple

Dissolved Air Flotation (DAF) systems are designed to remove suspended solids (TSS), biochemical oxygen demand (BOD5), and oils and greases (O&G) from a wastewater stream. Contaminants are removed through the use of a dissolved air-in-water solution produced by injecting air under pressure into a recycle stream of clarified DAF effluent. This recycle stream is then combined and mixed with incoming wastewater in an internal contact chamber where the dissolved air comes out of solution in the form of micron-sized bubbles that attach to the contaminants. The bubbles and contaminants rise to the surface and form a floating bed of material that is removed by a surface skimmer into an internal hopper for further handling.

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 Key Features

  • Fourteen (14) different units to meet a variety of applications and flow ranges (10 to 2,500 gpm)
  • Available in 304 or 316 stainless steel construction

  • Complete, skid-mounted design for ease of installation (no field assembly required)

  • Rectangular profile for maximum space utilization

  • Rugged tank design that will not flex

  • Superior performance without the use of plate-pack that can foul or collapse

  • An industry-leading HELLBENDER® whitewater system which is both efficient and simple to use

  • Large, internal float hopper removes the need for an external float tank

 Each DAF System Comes with

  • ​All stainless steel tank construction

  • Quality drive and pump components for long-term reliability

  • Multi-step quality control program

  • Full construction and component warranties

  • Complete start-up and training services

  • Process design assistance

  • Expert technical support before and after installation

 System Options

  • ​Flotation cell cover to contain and vent process gasses

  • Integrated floc tube

  • Analog pressure/flow monitoring sensors

  • Sludge level monitoring

  • Effluent TSS monitoring

  • Custom control systems (PLC, HMI, SCADA,)

 Biological DAF

​​Dissolved air flotation (DAF) has proven to be very effective for the removal of biological solids from wastewater streams. Some of the advantages over traditional, gravity clarification include:

  • Smaller footprint and more rapid implementation

  • Higher sludge solids content (4%TS vs. 1%TS) resulting in a much lower sludge volume

  • Ability to handle bulking solids that tend to float

  • More reliable effluent quality 

 

Some of the more common biological applications include:

  • Clarification of aerobic biomass in an activated sludge process

  • Polishing effluent from aerobic ponds

  • Clarification of anaerobic solids in an anaerobic contact process

  • Polishing effluent from anaerobic lagoons

  • Removal of algae from ponds

  • Polishing effluent from high-rate anaerobic processes


 

 Models and Specifications

DAF Models
Surface Area (ft2)
Length (ft)
Width (h)
Height (ft)
 
​RT-15​12​8' - 3"
​3' - 6"
​5' - 3"
​RT-30​30​11' - 10"
​4' - 9"
​7' -1 "
​RT-50​57​14' - 11"
​6' - 4"
​7' - 2"
​RT-70​70​17' - 11"
6' - 4"7' - 2"
​RT-100​101​18' - 8"
​8' - 5"
​8' - 2"
​RT-125​125​19' - 1"
​10' - 5"
​9' - 8"
​RT-140​143​24' - 8"
​8' - 5"
​8' - 2"
​RT-150​153​22' - 1"
​10' - 5"
​9' - 8"
​RT-160​159​27 ' - 8"
​8' - 5"
​8' - 2"
​RT-180182
25' - 1"
​10' - 5"
​9' - 8"
​RT-240239
​31' - 1"
​10' - 5"
​9' - 8"
​RT-300​297​37' - 1"
10' - 5"9' - 8"
​RT-350​360​37' - 6"
​13'​10'
​RT-500​503​49' - 6"
​13'​10'
douglas.ohalloran@evoqua.com Dissolved Air Flotation (DAF) Systems