Wuxi Dajiang Environmental Technology Co., Ltd.

DAF device technology uses extremely small air bubbles to lift suspended solids and oil to the top surface. The resulting sludge layer is scraped into the sludge storage tank. Coagulants and flocculants may need to be added to improve performance.

Removal efficiency is generally superior to gravity base systems and is typically used as a polishing step (downstream of CPI)
DAF units can be equipped with hermetically sealed caps, coagulation and flocculation metering and mixing equipment, as well as air saturation through special pumps or individual pressure vessels.

Flotation involves separating the solid from the aqueous phase by attaching it to fine bubbles to reduce the density of floating rather than sinking particles. The rising solids, called "floaters", are skimmed off the surface and further treated in the sludge column. Chemicals can be added to improve separation: first for agglomeration, then for flocculation.
The type of flotation used in dissolved air flotation (DAF), where the suspension is saturated by air under high pressure. The bubbles are released into the water and attach to the suspended solid. Air bubbles in DAF systems are much smaller than other types of flotation systems and adhere better to solids. This makes DAF is one of the most efficient flotation schemes in wastewater treatment.