Tennessee Wastewater Operator Practice Exam

What is the purpose of baffles between RBC units?

1. Increase flow velocity

2. Separate treatment stages

3. Reduce operating costs

4. Enhance chemical dosage

The correct answer is: Separate treatment stages

The purpose of baffles between Rotating Biological Contact (RBC) units is to separate treatment stages, ensuring that wastewater moves through the treatment process in a controlled manner. Baffles function by directing the flow of wastewater and helping to maintain the optimal hydraulic conditions necessary for effective microbial treatment. By compartmentalizing the system, baffles minimize the mixing of different stages, which facilitates better contact between the microorganisms on the RBC and the wastewater, improving the treatment efficiency. Each stage can target specific removal processes, allowing for a more focused treatment approach. This separation contributes to maintaining consistent environmental conditions for the microorganisms, enhancing their effectiveness in breaking down pollutants. In contrast, increasing flow velocity or enhancing chemical dosage does not specifically relate to the function of baffles within RBC units. While reducing operating costs can be an indirect outcome of improved treatment efficiency, it is not the primary purpose of baffles. Thus, the correct answer emphasizes the essential role of baffles in delineating treatment phases within the RBC system for optimal performance.