The wastewater aeration system is a core unit of wastewater treatment processes. Its primary function is oxygen supply for wastewater; meanwhile, it performs multiple auxiliary functions such as mixing agitation and water quality regulation to support stable operation of the entire biochemical treatment process.
1. Core Oxygenation Function
Air is continuously injected into wastewater to efficiently dissolve atmospheric oxygen into the water body, supplying essential dissolved oxygen for aerobic microorganisms to decompose organic matter and maintaining microbial metabolic activity.
Structures such as fine bubble aerators and cyclone aerators shear air into micro bubbles of 1 3 mm or even micron scale size. This greatly expands the gas liquid contact area, achieving an oxygen utilization rate up to 35 % and significantly cutting oxygenation energy consumption.
2. Mixing and Agitation Function
Upward airflows generated by aeration drive circulating water flow inside the tank, so that wastewater, activated sludge and dissolved oxygen are fully homogenized, preventing localized dead zones.
Continuous agitation keeps activated sludge in permanent suspension and avoids sludge sedimentation and compaction at the tank bottom, ensuring sufficient contact and reaction between microorganisms and pollutants in wastewater.
3. Process Stability Guarantee Function
Aeration drives continuous water circulation to prevent excessive local pollutant concentrations. It equalizes the distribution of water quality, dissolved oxygen and temperature across the whole tank and stabilizes the biochemical reaction environment.
Under certain operating conditions, aeration stripping can remove part of volatile harmful gases from wastewater, improve water body conditions and reduce the load of subsequent treatment units.