Water is polluted most often as a result of human activity. The pollution of water causes serious consequences and diseases. Waste water must be purified before it is discharged back to the bodies of water.
Nowadays, the most popular way of treating industrial and municipal waste water is the biological process called activated sludge process, which also takes place naturally. The actual biological purification in the aeration basin is performed by the natural bacteria in the sludge. Bacteria need oxygen (O2) for maintaining metabolism. The objective of aeration is to transfer a sufficient amount of oxygen to the liquid phase as well as to maintain sufficient mixing required by the active sludge in the aeration basin.
The greatest energy consumer at a waste treatment plant is usually the aeration process, which takes about 50-65% of the total consumed energy. Our several studies and practical experiences have proven that a correctly planned, optimised, well operated and serviced fine bubble aeration system reduces the energy consumption of aeration up to 50 %, compared to conventional systems.
• SOTR = standard oxygen transfer rate to clean water, kgO2/h
• AOR = actual oxygen requirement for the process, kgO2/h
• SOTE = standard oxygen transfer efficiency, %
• SAE = standard aeration efficiency, kgO2/kWh
• AE =aeration efficiency in process conditions, kgO2/kWh
• DD =diffuser density, i.e. the active surface area of aerators / the surface area of the basin, %
• DWP =dynamic wet pressure, pressure loss of the aerator when submerged, kPa/mbar/cmH2O