Aerobic biochemical tanks are core units for wastewater treatment, where sufficient oxygen supply and uniform mixing are essential to ensure the activity of aerobic microorganisms and efficient pollutant degradation. Jet aerators, characterized by their dual functions of oxygenation and mixing, are widely applied in the main aeration zones of various aerobic processes, including activated sludge process, AAO process, oxidation ditch, and SBR/CASS process.
Table of Contents
1、activated sludge process
The main aeration zone requires stable oxygen levels and thorough mixing to maintain the suspension of activated sludge flocs. Jet aerators operate by ejecting high-velocity water flow to form negative pressure, sucking in air and breaking it into fine bubbles, which significantly improves oxygen transfer efficiency. Meanwhile, the high-velocity jet creates strong turbulence, promoting full contact between wastewater, activated sludge, and oxygen, preventing sludge sedimentation and ensuring uniform distribution of microorganisms and pollutants.
2、AAO process
The main aeration zone (aerobic zone) undertakes the key task of organic matter degradation and nitrification. Jet aerators provide continuous and efficient oxygen supply to meet the high oxygen demand of nitrifying bacteria. Their strong mixing capacity eliminates oxygen concentration gradients and ensures uniform distribution of substrates in the aerobic zone, avoiding local oxygen deficiency and improving the stability and treatment effect of the process. Additionally, their anti-clogging feature is suitable for long-term stable operation in complex water quality conditions.
3、oxidation ditches
The main aeration zone needs to maintain a continuous circular flow while providing sufficient oxygen. Jet aerators, especially directional and bidirectional types, generate strong water flow to drive the circular movement of mixed liquor, realizing simultaneous oxygenation and mixing. They can adapt to the deep tank design of oxidation ditches, extending the contact time between bubbles and water, and ensuring uniform oxygen distribution in the entire aeration zone, which is conducive to stable operation of the process and energy saving.
4、SBR/CASS process
The main aeration zone undergoes alternating aeration and static sedimentation stages. Jet aerators can flexibly adjust the aeration intensity to meet the oxygen demand of different reaction stages. During the aeration stage, they not only supply oxygen efficiently but also stir the mixed liquor thoroughly, ensuring full reaction between microorganisms and pollutants; during the sedimentation stage, they can be shut down to avoid affecting sludge sedimentation, showing excellent operational flexibility. Their simple structure and easy maintenance also reduce the operational cost of SBR/CASS systems.
Conclusion
Jet aerators play an irreplaceable role in the main aeration zones of various aerobic biochemical processes. Their dual functions of efficient oxygen supply and thorough mixing not only ensure the normal metabolic activity of aerobic microorganisms but also improve the treatment efficiency and operational stability of the processes, making them a reliable aeration equipment in wastewater treatment engineering.
