The Dissolved Air Flotation (DAF) machine is a water treatment device that generates microbubbles through the principle of "pressurized dissolution and atmospheric release" to efficiently separate suspended solids, oils, and colloids from water. It is widely used in industrial wastewater treatment and water purification.

The DAF machine mainly consists of three components: the dissolution system, the release system, and the flotation separation zone.

Dissolution: Through a dissolution pump and an air compressor, air is forcibly dissolved into water within a pressurized tank (typically at 0.3–0.6 MPa), forming pressurized dissolved-air water.

Release: The pressurized dissolved-air water enters the atmospheric flotation tank, where the sudden pressure drop causes supersaturated air to precipitate out, forming a large number of microbubbles with diameters of 20–50 micrometers. This bubble size is the key to efficient separation.

Separation: The microbubbles attach to impurities such as suspended solids and oil droplets in the water, reducing their overall density to below that of water. These impurities then rapidly rise to the surface to form a scum layer, which is removed by a skimmer, while the clarified water is discharged from the bottom.

The main body of the equipment is typically a rectangular or cylindrical steel structure, with treatment capacities ranging from a few tons per hour to several hundred tons per hour.