The terminology of dissolved air flotation in wastewater doesn’t mean what it sounds, in fact when oxygen from air is pumped into wastewater or contact with wastewater, the water molecules form bonds (Van der Waals forces) with the oxygen molecule and the oxygen molecule is “caged” by water molecules like this:
W = water O = oxygen
WWW - WOW - WWW
Air is trapped in water in micro size, and it's called dissolution (or dissolved). Micro air bubbles in Benenv high efficiency DAF size is: 5 – 8 μm The adherence of suspended solids to bubbles is easier and more intensive, the smaller the bubbles are. Because of the improved adherence capacity of small microbubbles, the saturation of the introduced air as well as the reduction capability of particles lead to an improved suspended solids reduction, a higher solids content in the float sludge and a more stable float sludge on the surface of the micro-flotation cell.
◆ DAF Separation Mechanism
◆ DAF System Process