DAF (Dissolved air flotation system)

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

  1. Saturator

  2. DAF Tank

  3. Sludge removal system

How we can optimization DAF system?

  1. Recycle rate

  2. Bubble size / Pressure

  3. Scraper speed

  4. Dosing

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