Increasing Oxygen In Wastewater – How To Achieve Aeration

Aeration is exposing wastewater to the atmospheric oxygen. Excellent aeration in wastewater is achieved by:

A) The increase in the contact area between water and air (water is sprayed in small droplets as is done in the cooling tower provides good exposure). You can also read more about aerated wastewater treatment system via https://ecoseptic.com.au/aerated-wastewater-treatment-system

B) Agitating the liquid surface continuously to minimize the liquid film thickness.

C) Increasing contact time of water with air (for example, we can increase the height of the jet aerator spray).

There are many devices to increase oxygen in the wastewater. The popular ones are:

a) Cascades

b) Splash tray

c) Shallow beds of coke crushed or similar materials where the water will fall (both adsorption effect and aeration).

d) Or perforated pipes or porous plates through which water is distributed.

'Local conditions', 'quality of treated water' and 'what is sought to be removed from or added to the water', specify the method of aeration of the wastewater treatment process.

However, aeration increases the oxygen content of the wastewater, which may not always be desirable. For example, increases oxygen in the wastewater can accelerate corrosion and algae growth.

Aeration has also been found to be less effective in improving the taste and odor. These days, there are several good chemical methods available to achieve better taste and smell. For example, adding chlorine or active carbon with aeration system is found to be very effective.