Florida Wastewater Practice Test 2025 – Complete Exam Prep

The factor that is known to cause the most wear to an impeller in wastewater treatment is grit. Grit consists of small, abrasive particles such as sand, silt, and gravel that are commonly found in wastewater. When these particles are drawn into the impeller during the treatment process, they create friction against the impeller's surfaces, resulting in erosion and physical wear over time.

The impact of grit is significant because it continually interacts with the impeller during operation, leading to reduced efficiency and potential failure if not managed properly. In addition to grit, other factors like chemicals, temperature, and pressure can affect equipment longevity, but their impact is generally less severe concerning the specific wear dynamics associated with the impeller in the presence of abrasive materials. Therefore, acknowledging the role of grit is crucial in designing and maintaining wastewater systems effectively to enhance equipment life and minimize downtime.