Dissolved Air Flotation Description
DAF dissolved air flotation consists of flotation tank, dissolved air system, reflux pipe, dissolved air released system, skimmer (Based on customer needs, there are combined type, traveling type and chain-plate type to choose.), electric cabinet and so on.
Air flotation separation technology of DAGYEE DAF dissolved air flotation dissolved air into water at certain working pressure. In the process, pressurized water is saturated with dissolved air and is discharged into a flotation vessel. The microscopic air bubbles produced by released air attach to suspended solids and float them to the surface, forming a sludge blanket. A scoop removes the thickened sludge. Finally, it complete purifies the water.
Dissolved Air Flotation Feature
The continuous evolution of DAF technology is driven by the need for greater efficiency and sustainability.
Energy Efficiency: Advances focus on reducing energy consumption through improved aeration systems and optimized flotation models. The development of ultra-fine bubble generators enables more efficient bubble-particle aggregation.
Chemical Dosing Optimization: Use of coagulant and flocculant aids in improving the agglomeration of particles prior to flotation, enhancing the removal efficiency and reducing chemical usage.
Automation and Control Systems: Modern DAF units often incorporate sophisticated control systems for optimizing operation, facilitating real-time monitoring and adjustment of process parameters to ensure optimal performance.
Dissolved Air Flotation Principle
Dissolved Air Flotation is a fairly simple technology using pressurised air to remove small solids, oils, and greases from wastewater. The physical process happens as follows:
Pressurised air is mixed with pressurised water. Due to the higher pressure, more air is able to dissolve into the water. Pumps with a high energy output are able to achieve complete air saturation of the water.
The pressure control valve causes the high pressure to drop to low. The resulting drop in pressure means that the water is now suddenly over-saturated (supersaturated) with air.
The excess air molecules start to cluster together at existing nucleation sites such as small particles or longer-chain molecules, or surface-active molecule. Since the water is supersaturated instantaneously, the clusters of air molecules stay small, forming very small bubbles.
Buoyancy now causes the bubbles to rise, taking the contaminants with them. Generally, the surface tension of the water keeps particles incased in bubbles once they reach the top of the tank, causing a foam to form which can be easily removed.
Dissolved Air Flotation Applications
Make-up water clarification
Wastewater treatment End-of-pipe (EOP) treatment
Cooling water clarification
Caster spray water clarification
Rolling mill contact water clarification
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