Tennessee Wastewater Operator Practice Exam

What is the likely consequence of a blockage in the lower port of a grit cyclone?

1. Reduced efficiency

2. Excess vibrations

3. Improved settling

4. Increased flow

The correct answer is: Excess vibrations

A blockage in the lower port of a grit cyclone likely leads to reduced efficiency in the separation of grit and suspended solids. The primary function of a grit cyclone is to use centrifugal force to separate heavier particles, like grit, from wastewater effectively. When the lower port is blocked, proper flow dynamics are disrupted, preventing the effective discharge of grit particles. This means that grit and other particulates remain in the cyclone longer than intended, which can lead to inefficient separation and potential overflow issues. The other options do not accurately reflect the result of a blockage. Excess vibrations can result from mechanical issues not directly related to a blockage. Improved settling would be an unlikely outcome of a block, as proper settling requires a certain flow rate and particle removal. Increased flow is counterproductive in this situation, as a blockage typically would cause a backup instead of allowing for higher flow rates. Therefore, the impact of a blocked lower port primarily reflects a significant decrease in the system’s efficiency.