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choosing the right aerators for1368 .pdf

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choosing the right aerators for
Any effluent wastage plants can be effectively managed with proper and adequate effluent
treatment plans ( visit here ) and machineries. One of the essential parts of effluent treatment plan
is aerobic treatment process. Though just a part of the whole effluent treatment system, aerobic
treatment process forms an essential part of the process. Effective aerobic treatment can lead to
more energy-efficient and cost-efficient effluent treatment.
How does the aerobic treatment process take place?
The process of absorbing oxygen from the air is known as aerobic treatment process. This
process is carried out with the help of aeration tank that provides high amount of oxygen to the
effluent waste. This is an important part of the process as sewage or sludge has high level of
biochemical oxygen demand or BOD. Since, it is not possible to provide this amount of oxygen
naturally, aeration tanks have to be fitted.
How do aerators help in treating the sewage?
Aerators help mix the sewage in a volatile way with the help of oxygen thrust so that it is evenly
distributed throughout the entire effluent zone. The thrusts force the solid effluent and throw them
from underneath the liquid and suspend them above. Aerators feature minimum ripple velocity
that helps distribute solid effluent and oxygen over the liquid surface. This is done to increase
oxygen absorption from the surrounding air.
What are the types of aerators?
Aerators can be broadly classified as vertical surface and horizontal surface aerators. These
aerators can be further classified as fixed or floating aerators. The classification is distinguished
by the method with which the electrically operated propellers are mounted. If the propellers are
mounted on fixed support they are known as fixed aerators and if they are mounted on floating
supports, they are known as floating aerators.
Most effluent treatment plants choose fixed aerators – these aerators are supported on concrete
tanks or channels. Effluent plants have extensive bridges built over the length of these channels
or tank and these bridges support the operation of fixed aerators. Floating aerators don't need
bridges to support them and are installed on floating supports. They are useful in effluent plants
with higher depths.
How to choose the right aerator?
A good aerator is one that combines high oxygenation effectiveness and this is done with the help
of rapid suspension and mixing of oxygen. According to engineering experts, the ideal rate of
Oxygen Transfer Capacity of an aerator should be 2.4 Kg. of O2 to 3.27 Kg. of O2 /kw/hr. the rate
can however fluctuate from plant to plant depending on the size of the plant and the atmospheric

Other than that, the base of the aerator is very important. The small to medium aerators from 5HP
to 20HP can have fabricated base frame but the large aerators ( click here ) must have a heavy
beam base. This is of utmost importance as it is required to reduce vibrations. The newest feature
that is considered a value addition is having semi-open impellers that can clean themselves.
All in all, the right aerators will provide greater oxygen transfer efficiency with more energy
conservation. This will not only help you to save precious energy but also atmospheric oxygen.

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