Wastewater Oxygenation Systems
Dissolved Air Flotation or DAF
Integrated Engineers has adapted the proven concept of Dissolved Air Flotation
(DAF) to take full advantage of its FloccinAgent™ line of products by
incorporating our innovative plate pack concept.
The plate pack acts as a hydraulic buffer, channeling flow through the flotation cell and increasing the rise rate. The combination of the plate pack and FloccinAgent™ addition allows much greater hydraulic loading than conventional DAF designs. That means higher flow and wastewater treatment rates in the same floor space.
- Influent Wastewater Piping. Prior to this point, FloccinAgent™ has been
added to the waste stream and the combination passed through a series
of flocculation tubes for mixing. - Recycle Addition. Pressurized recycle water, supersaturated
with air, is
added to the influent wastewater stream. The air comes out of solution,
and tiny air bubbles attach to flocced solids in the stream. - Influent Header. The flocculated wastewater enters
the flotation cell
through the influent header. Flocced solids, given positive buoyancy by
the air bubbles that have attached to them, float to the top of the cell. - Float Layer. Solids that float to the top of the
flotation cell accumulate in a
thick layer here. - Plate Pack. Water flowing toward
the effluent port must pass through the
plate pack. The plates provide regions of smooth flow
where neutrally
buoyant solids drop out of the stream and begin to rise upward. - Supplementary Aeration. These fine-bubble diffusers
supply more fine
air bubbles to help float solids to the top of the flotation cell. - Weir. This adjustable weir allows the height of the
water and float in the
flotation cell to be adjusted. - Effluent. Clean water is discharged through the effluent port.
- Recycle. A portion of the total flow through the DAF is recycled.
- Recycle Pump. Here water in the recycle line is pressurized
and
supersaturated with air. - Pressure-Regulating Valve. This valve, located where
the recycle water is
added to the influent line, maintains pressure in the
recycle line and
ensures air in the recycle line remains in solution. - Float Skimmer. A series of skimmer paddles push the
float D up and over
an inclined ramp into the float tank. - Float Tank. A conical bottom directs float in the
tank to an outlet, to which
a pump will be connected to pump the float to a bin for haul off.
DAF systems are available from Integrated Engineers with throughputs ranging from 40 to 500 gallons per minute.
| Model | Flow (gpm) | Length | Width | Height |
|---|---|---|---|---|
| DAF-40 | 40 | 9’ (2.7 m) | 4’ 6” (1.4 m) | 7’ (2.1 m) |
| DAF-60 | 60 | 11’ (3.4 m) | 5’ (1.5 m) | 7’ (2.1 m) |
| DAF-75 | 75 | 11’ (3.4 m) | 5’ 6” (1.7 m) | 7’ 6” (2.3 m) |
| DAF-100 | 100 | 14’ (4.3 m) | 6’ (1.8 m) | 7’ 6” (2.3 m) |
| DAF-150 | 150 | 16’ (4.9 m) | 7’ 6” (2.3 m) | 8’ 6” (2.6 m) |
| DAF-200 | 200 | 16’ (4.9 m) | 8’ 6” (2.6 m) | 8’ 6” (2.6 m) |
| DAF-300 | 300 | 20’ (6.1 m) | 10’ (3.0 m) | 9’ 6” (2.9 m) |
| DAF-500 | 500 | 28’ (8.5 m) | 11’ (3.4 m) | 10’ 6” (3.2 m) |
| DAF-1000 | 1000 | 40’ (12.2 m) | 18’* (5.5 m) | 9’ (2.7m) |
*The DAF-1000 is shipped as two 40’ L x 8’ W modules for side-by-side installation.
