Dissolved Air Flotation
The air-water solution is then passed through a saturation tank to allow additional time for the air to dissolve and to remove any coalesced air bubbles. The solution is then expanded across diaphragm control valves leading into WSI’s proprietary diffusers inside the body of the DAF. By reducing the pressure of the solution rapidly (expanding), the dissolved air is forced out of solution in the form of micro-bubbles (90% of the bubbles formed are less than 10 µm in diameter).
WSI DAF Designs
Nikuni DAF Pumps
The Nikuni DAF pump is a high flow micro-bubble generator made from 316 stainless steel. The Nikuni pump is a highly precise pumping mechanism that generates microbubbles by utilizing two hydro-dynamic principles: negative pressure sucking both air and water simultaneously from each port; air effectively mixed into water; which properly produces pressurized nitrogen-enriched discharge.
Micro Bubble Distribution
The Micro bubbles generated from the Nikuni pump system are dispersed into the DAF by three to six precisely located white water injectors. These injectors are constructed out of 1.5” schedule 10 304 stainless steel pipe. These pipes run the width of the DAF and have a proprietary grooved design opening for proper distribution and enhanced flocculation. Each injector has a diaphragm valve that will allow the operator to dial in the precise distribution of white water.