Tennessee Wastewater Operator Practice Exam

Which of the following are components of mixer aerators?

1. Intake vents, compressor, and motor

2. Submerged mixer body, sparger ring, separate air supply, and platform mounted motor

3. Surface fans, chemical injectors, and aeration shafts

4. Diffusers, control panels, and pumps

The correct answer is: Submerged mixer body, sparger ring, separate air supply, and platform mounted motor

The components of mixer aerators are specifically designed to facilitate both mixing and aeration in wastewater treatment processes. The correct choice includes a submerged mixer body, which serves to agitate and mix the wastewater, enhancing contact with the air for better oxygen transfer. The sparger ring is critical as it helps to inject air into the mixed wastewater, creating bubbles that promote aeration. A separate air supply is also included, ensuring a consistent and controlled delivery of air or oxygen to the mixing zone. Finally, a platform-mounted motor is an essential component that powers the mixer body, providing the necessary energy to maintain the mixing process effectively. In contrast, the other choices list components that do not all align with the function of mixer aerators. For instance, intake vents, compressors, and motors primarily relate to different types of aeration systems rather than mixer aerators specifically. Additionally, surface fans and chemical injectors do not typically belong to the assembly of a mixer aerator. Lastly, diffusers and control panels are associated with various aeration systems, not specifically with the mixer aerator configuration. Understanding these specific components and their functions highlights why choice B is the correct answer.