Process Description of Dissolved Air Flotation
May 15,2023Read More
The dissolved air flotation (DAF) process is based on coagulation and flocculation mechanisms. By adding specific chemicals (water treatment flocculant), such as iron chloride and aluminum chloride, colloidal particles are destabilized and floc formation takes place. Flocculation with other chemicals, such as polyelectrolyte, facilitates the collision between the destabilized suspended and colloidal particles to form larger clots that can be readily removed.
The process separates solid particles from the liquid. At first water is saturated with dissolved air under pressure. This recycle stream (pressurized from 4 to 6 bar), called the hypersaturated stream, is then mixed with the incoming wastewater in an internal contact chamber, where the microscopic air bubbles attach to solids and float them to the surface, forming a floating sludge bed.
A scraping assembly skims the sludge from the surface of the water and into a sump, from where it's pumped to sludge treatment. The treated water is then discharged or undergoes other treatment processes.
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