The FS Series Dissolved Air Flotation (DAF) Water Treatment Systems


Our Dissolved Air Flotation “DAF” units use a pressurized stream of water to deliver dissolved air to an incoming wastewater treatment stream that contains flocculated waste. When the pressure of the dissolved air and water stream is reduced, the air effervesces out of the water and attaches itself to the waste particles.

These particles are then buoyant and will float to the surface. Once at the surface, the particles form a thick sludge blanket which is then drawn to the exit of the DAF unit and scraped into a sludge hopper. The clean, pollutant free water leaves the bottom of the DAF unit.

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Model USGPM* Square Footage RAS Steam GPM Air NGPM Incoming TSS**
FS-10 5-40 10 2-5.7 0.5 0-3000
FS-20 10-80 20 2-11.0 0.9 0-3000
FS-30 15-120 30 2-17.5 1.4 0-3000
FS-60 30-240 60 10-30.7 2.5 0-3000
FS-90 45-360 90 10-50 4 0-3000
FS-120 60-480 120 10-66 5 0-3000
FS-180 90-720 180 10-100 8 0-3000
FS-240 120-960 240 10-123 10 0-3000
FS-480 240-1920 480 20-254 15 0-3000
FS-640 320-2560 640 40-738 60 0-3000


Construction Carbon Steel or Stainless Steel (304)
Sludge Hopper Sensors High and Low, With/Without Timer
Bottom Hopper Valves Air Actuated With/Without Timer
Sludge Pump Included on Models FS-90, 120, 160, 240, 480, 640
Discharge TSS Probe Included on Models FS-90, 120, 160, 240, 480, 640
Skimmer Drives Single or Dual
Remote Start Included on Models FS-90, 120, 160, 240, 480, 640

Common FS Series DAF Models


*USGPM “Gallons per Minute” based on incoming flow rate. **Incoming TSS Figures = Up to 12,000 mg/L can be designed.

Saturated Air Stream

What separates our DAF Units from our competitors is the ease of use. The majority of our competitors use contact chambers after the pressure pump to dissolve the air into the water. Maintaining the level in these contact chambers properly is very difficult, often resulting in the use of less air than optimum. This reduces the overall performance of the DAF water treatment system. The JNE Environmental FS Series DAF Units solve this problem by using a specially designed pump to pressurize and mix the air in one step. The pump shears the inlet air into small bubbles, maximizing the interface through which the air can dissolve into the water stream. This eliminates the use of a contact chamber and provides maximum air saturation in one step.

Minimizing Water in the Sludge

JNE Environmental’s design for DAF Unit sludge handling is superior to our competitors. Other DAF water treatment systems combine sludge skimming and scraping functions into a singular unit.  These single drive units do not maximize sludge dryness or save on construction costs. Our DAF units provide a separate sludge thickening skimmer and sludge removal scraper with variable frequency drives, enabling the speed of these two units to be changed independently. This allows for precise fine tuning of the sludge dryness, minimizing sludge removal costs.

Maximized Air to Solids Ratio

JNE Environmental has also maximized the attachment of air bubbles by providing low shear contact time in the inlet piping and in the first compartment of the DAF Unit. This ensures that all of the available air can dissolve directly onto a particle (lower Gibb’s free energy) instead of relying on the air bubbles colliding with particles and attaching like many of our competitors designs.

Total Cost of Ownership

The JNE Environmental FS Series DAF Units were designed with our customers total cost of ownership in mind. Our DAFs minimize the cost of compressed air by only consuming as much air as can be dissolved into the water. Some competitor units use contactors to vent air continuously to maintain the air-to-water operating level within their contactors. This is wasteful and increases the cost of operation. Our DAF water treatment systems are designed to minimize the cost of compressed air by only consuming as much air as can be dissolved into the water. Another total cost of ownership benefit of the JNE Environmental FS Series DAF Units is the reduced electricity cost of operating our Return Activated Sludge (RAS) pump. Our RAS pumps are specifically designed to maintain consistent flow while cavitating, allowing for continuous pumping and efficient discharge pressures. This keeps the overall horsepower of the pump motor much smaller than our competitors’ traditional multi-stage centrifugal pumps.