Tennessee Wastewater Operator Practice Exam

What is a typical indicator that a grit basin is functioning properly?

1. Stable flow velocity

2. Rag accumulation

3. Uneven grit distribution

4. Clear effluent

The correct answer is: Stable flow velocity

A typical indicator that a grit basin is functioning properly is stable flow velocity. This is crucial because the function of a grit basin is to allow heavier particles, such as sand, gravel, and other inorganic materials, to settle out of the wastewater effectively. When the flow velocity is stable, it indicates that the hydraulic conditions within the basin are optimal, allowing for effective sedimentation of grit. Inconsistent flow velocities can lead to either the resuspension of settled grit or inefficient settling, which would negatively impact the operation of the treatment system. Having a stable flow ensures that the grit basin operates within its designed specifications, promoting the effective removal of coarse solids from the influent. This fidelity in function reduces wear and tear on downstream processes and equipment, which can be critical for overall system efficiency and maintenance.