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Aeration: It is the process in which water is brought in contact of oxygen…
Aeration
: It is the process in which water is brought in contact of oxygen
About the process
aeration is often the
first major process
at the treatment plant
scrubbing process
caused by the
turbulence of aeration
physically removes dissolved gases from solution and allows them to escape into the surrounding air
efficiency of aeration depends on the amount of surface contact between air and water,
which is controlled primarily by the size of the water drop or air bubble
the smaller the bubble of air/water, the better
Purpose
Remove
dissolved gases
like hydrogen sulfide (H2S) and CO2
Carry out the
oxidation of undesirable substances
like organic matter and oils
Removes
volatile liquid
like phenols, humic acids from water.
Remove the
dissolved minerals
like Fe, Mg etc.
Remove colour, odour and taste.
Increase
DO level
in water
Consequences of
no
aeration
Increase acidity in water due to increased level of CO2
Corrosive to piping
Produce rotten egg odor
Type of aerators
water-in-air method
: designed to produce small drops of water that fall through the air
Cascade Aerators
Spray Aerators
Cone Aerators
Air-in-water
method
: creates small bubbles of air that are injected into the water stream
Diffuse Aerators
Pressure Aerators
Centrifugal Aerators