Tennessee Wastewater Operator Practice Exam

What is a unique feature of a catenary screen?

1. Single operating cycle

2. Efficiently removes hair and stringy material

3. Interlocking links, no lower sprocket

4. Two sets of lamella lift solids up stairs

The correct answer is: Interlocking links, no lower sprocket

A catenary screen is characterized by its design that incorporates interlocking links without a lower sprocket. This unique feature allows the screen to effectively transport materials while minimizing operational issues that can occur with traditional designs that utilize lower sprockets. The interlocking link design provides enhanced stability and efficiency in moving screenings up the incline of the screen. This design aspect is crucial because it enables the effective handling of solid waste materials in wastewater treatment processes. By not having a lower sprocket, the system reduces potential maintenance requirements and increases reliability. Therefore, the interlocking links enable continuous operation without the problems associated with components that might wear out or require frequent adjustments. This feature distinguishes it from other types of screens, which may not use an interlocking mechanism or may have more conventional designs that involve multiple moving parts, potentially leading to more frequent maintenance needs.