Aerobic Treatment

In wastewater treatment, aeration is part of the stage known as the secondary treatment process. The activated sludge process is the most common option in secondary treatment. Austro uses this technology to achieve desirable results in ETP treatment and as a part of ZLD process.


Aeration in an activated sludge process is based on air or oxygen into the wastewater by using submerged devices such as EPDM diffusers. As bubbles rise through the wastewater, oxygen is transferred from a gaseous state to a liquid state – thus adding dissolved oxygen (DO) to the water and they keep the microorganisms suspended, so they do not settle out. The longer these particles are suspended and maintain contact with the DO, the more waste solids they can consume and break down. The microbes feed on the organic material, forming flocs which can easily settle out. After settling in a separate settling tank, bacteria forming the "activated sludge" flocs are continually re circulated back to the aeration basin to increase the rate of decomposition.


  • Aeration is the most critical component of a treatment system using the activated sludge process.
  • A well designed aeration system has a direct impact on the level of wastewater treatment it achieves.
  • An ample and evenly distributed oxygen supply in an aeration system is the key torapid, economically-viable, and effective wastewater treatment.
  • To meet discharge limits for BOD5and COD
  • To remove nitrogen and phosphorous
  • To provide direct discharge quality effluent
  • To stabilize or reduce the sludge volume of biological treatment biosolids

Industrial Applications

Aerobic treatment is used in so many industries such as Pharmaceutical, Power plant & Boiler Application, Oil & Gas, Chemical, Distilleries, Tannery and Textile industries.