Sewage treatment plants are categorized under two basic types; Anaerobic and Aerobic sewage treatment. With this blog, we'll be learning all the basics of the aerobic sewage treatment plant. In the aerobic sewage treatment process, aerobic bacteria digest the pollutants. You also must provide air for the germs to breathe and let them set a bacterial colony. At a sewage treatment plant, the air is always supplied to the Biozone by either of these two processes: Direct Surface Aeration with Impellers propelled by pumps which whisk the surface of the liquid with the atmosphere, or by Submerged Diffused Aeration using blowers for air supply via bubble diffusers at the bottom of the tank. Note: The most prevalent aerobic sewage treatment plants employ natural air currents and do not need electricity. However, these are just used for small scale sewer systems right now. Aerobic conditions establish an aerobic bacterial colony. These help in reaching complete digestion and oxidatio...