Flotation involves separation of solids from the water phase by attaching the solids to fine air bubbles to decrease the overall density of the particles so that Particle float instead of sinking.
The rising solids are called the “froth”. The float is skimmed off the surface by Scraper and further processed in the sludge train.
It is used for removal of suspended solids such as emulsion of oil and grease.
Basic of DAF
DAF works best in specific gravity near 1.
It required comparatively less area.
Higher power consumption than a gravity settler system.
High efficiency of removal.
Oil can be related to 1 ppm depending on feed water inlet concentration.
System consists of three parts
Sludge removal system
How we can optimization DAF system?
Bubble size / Pressure