Dissolved air flotation (DAF) is a wastewater treatment method that uses pressurized air to remove oil and solid wastes. It transforms small particles into larger clusters through chemical coagulation, utilizing coagulants like ferric chloride and aluminum sulfate. The DAF system offers advantages such as high water quality, greater dependable effluent quality, and operates efficiently without plate packs.

1. An Introduction
to Dissolved Air
Flotation (DAF).
Brought to you by Kelvin Water Technologies Pvt. Ltd
Environmental Consultant

2. What is Dissolved
Air Flotation?
Dissolved Air Flotation is a water or wastewater treatment
system which uses air for water treatment. In this air under
pressure is dissolved in the wastewater which when released at
atmospheric pressure in flotation tank basin removes the oil
and solid wastes from the water.

3. How does it works?
DAF is particularly suited to water supplies with
characteristics such as those containing low-density
particles and those yielding low-density particles following
chemical coagulation. Feedwater is added to the DAF float
tank which transforms the small particles into big particles
by coagulating the smaller particles to form a cluster. This
coagulation is done by adding coagulants like ferric chloride
and aluminum sulfate.
Then the effluent water is pumped to
the small vessel in which with the help of an air compressor,
air pressure is maintained which helps unsaturation of
pressurized water with air. Wastewater is recycled through
recycling pumps passing through air compressor to air
drum & then into float tank again leaving the waste on the
surface.

4. Flow Diagram of DAF

5. Advantages of
DAF
The DAF method has a Low-head round tank.
It can produce higher water quality.
02
It has greater dependable effluent quality.
03
Flotation technique has numerous system
benefits over sedimentation
05
It is operating at high floor loadings,
ensuing in tremendously small and shallow
plants.
06
It works effortless without the use of a
plate pack.
04
01

6. Kelvin Water
Technologies Pvt. Ltd.
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