Tennessee Wastewater Operator Practice Exam

What may increased blower discharge pressure indicate?

1. Excessive aeration

2. Fouled diffusers

3. Low oxygen transfer

4. High solids concentration

The correct answer is: Fouled diffusers

Increased blower discharge pressure is commonly associated with fouled diffusers. Diffusers are vital components in aeration systems as they release air into the wastewater to facilitate oxygen transfer. When these diffusers become fouled or clogged—due to biofilm accumulation, particulate matter, or other debris—the system needs to work harder to push air through the diffusers. This results in higher pressure readings at the blower discharge. Fouled diffusers can lead to inefficient oxygen transfer, which in turn can affect the treatment process and the overall health of the aerobic microorganisms in the system. Monitoring blower discharge pressure is therefore essential for identifying potential problems in aeration performance, and addressing diffuser fouling can help maintain proper system operation and efficiency.