Tennessee Wastewater Operator Practice Exam

Why is it important for centrifugal blowers to have diffusers?

1. To control the temperature

2. To minimize air turbulence

3. To optimize airflow and increase pressure

4. To enhance motor efficiency

The correct answer is: To optimize airflow and increase pressure

Centrifugal blowers utilize diffusers to optimize airflow and increase pressure, which is essential in various applications such as wastewater treatment. The design of the diffuser allows for a smooth transition of airflow from the impeller to the duct system. As air exits the impeller at high velocity, the diffuser slows down this airflow, leading to a pressure increase. This process is fundamental because it helps convert kinetic energy into pressure energy, effectively raising the air pressure to a usable level for processes requiring aeration or pneumatic transport. In addition to improving operational efficiency, the optimization of airflow is crucial for ensuring that the system functions effectively, preventing issues like backpressure and optimizing power consumption. This characteristic reflects the essential role of the diffuser in enhancing the overall performance of the blower system, ultimately leading to better air distribution and a more effective treatment process in wastewater applications. Therefore, the emphasis on optimizing airflow and pressure represents not just an operational benefit but also a critical component in maintaining effective and efficient waste management systems.