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choosing the right aerators for
Any effluent wastage plants can be effectively managed with proper and adequate effluent
treatment plans 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.
What is aerobic treatment process?
Aerobic treatment process involves absorbing oxygen from the air. It consists of aeration tank that
provides high amount of oxygen as the sewage has high level of BOD (Biochemical Oxygen
Demand). Since, this phenomenon can't happen naturally, we use aerator ( click here ) for it.
How do aerators help in treating the sewage?
Aerators help circulate the sewage in a rapid manner with thorough mixing and propulsion of
oxygen so that it is evenly distributed throughout the entire zone. They draw the solid sludge from
underneath the liquid and keep them in suspension and distribute it over the liquid surface with
the help of minimum ripple velocity. This speeds up the task of absorption of oxygen from the
Types of aerators
There are two main types of aerators – vertical surface and horizontal surface aerators. They
consist of electrically operated propellers that are mounted on fixed or floating supports. In most
places, we see aeration machineries consisting of reinforced concrete tanks or channels with
fixed aerators. They are supported by extensive bridges over the length of the tank or channel in
which they operate.
On the other hand, the floating aerator looks like a catamaran with dynamic support features that
change with the change in demand from the application. The floating aerators are very sturdy,
more reliable and can cater higher depths. Moreover, they are easier to install and more costfriendly as we don't need to build a platform for them.
Characteristics of good aerators
There are three basic characteristics of good aerators – they are 1) oxygen effectiveness, 2)
vibration levels and 3) use of latest technological inventions. Good aerators will have high output
of oxygen effectiveness. They will have heavy base frame made from quality materials to reduce
vibrations and lastly they will use the latest technical features like semi-open impellers. Besides
these, good aerators will also yield high return on investments by cutting down on energy use.
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 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.
Importance of aerators
High amount of sewage can be very dangerous; in fact it can be fatal. Government bodies have
very strict laws about the use of good aerators and other equipments in effluent treatment plants (
visit here ) and hence it is very important to take the importance of aerators seriously. 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.