Tennessee Wastewater Operator Practice Exam

What is the technique called where high air flows are sent through membrane diffusers for short periods?

1. Air purging

2. Air bumping

3. Air cycling

4. Air flushing

The correct answer is: Air bumping

The technique in question is referred to as air bumping. This method involves the use of high airflow rates that are directed through membrane diffusers for brief intervals. Air bumping is primarily utilized to enhance the mixing and oxygen transfer efficiency in wastewater treatment processes. By increasing the air flow temporarily, it helps dislodge any accumulated materials, ensuring that the membrane diffusers remain effective and open. This process not only aids in maintaining the performance of the diffusers by preventing clogging but also assists in improving the overall condition of the aeration system, enabling better biological treatment of the wastewater. The short bursts of high air flow can also promote improved contact between the air and the wastewater, which is crucial for maintaining adequate dissolved oxygen levels necessary for the microorganisms involved in the treatment process. Other techniques listed may involve air movement or adjustment but do not specifically describe the action characterized by high-flow, short-duration applications through membrane diffusers as accurately as air bumping does. This specificity highlights the importance of recognizing the nuances in wastewater treatment terminology and methodologies.