In dissolved air flotation , the water saturated with air under pressure passes through a nozzle whereby the bubbles are formed and reach the flotation chamber, which is at atmospheric pressure. The air becomes supersaturated and precipitates out of solution in the form of tiny bubbles.
It is then transformed to an evenly distributed laminar flow as it enters the DAF cell. Additionally, any excess air is captured and vented outside of the DAF cell, thus preventing air turbulence and disruption of the floated sludge at the surface. This results in optimum use of the DAF cell flotation area.
Dissolved air flotation is a water treatment process designed to remove oils, solids, and greases. In fact, the process helps clarify wastewaters and other waters by eliminating different types of suspended matter. The DAF process dissolves air in the water under pressure then releases it at atmospheric pressure.
Dissolved air floatation and coagulation floatation units, are widely used for the removal of total suspended solids , colloids and fats from slaughterhouse watercourses.
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In the dissolved air flotation system, a liquid stream saturated with pressurized air is added to the dissolved air flotation unit where it is mixed with the incoming feed. As the pressure returns to the atmosphere, the dissolved air comes out of the liquid forming fine bubbles bringing fine particles with them.