Tennessee Wastewater Operator Practice Exam

What distinguishes a continuous self-cleaning screen?

1. Efficiently removes hair and stringy material

2. Rectangular openings limited in height and width

3. Integrate wash press

4. Two sets of lamella lift solids up stairs

The correct answer is: Rectangular openings limited in height and width

A continuous self-cleaning screen is distinguished by its design that incorporates specific functionality aimed at optimizing its performance in wastewater treatment applications. The choice stating "rectangular openings limited in height and width" accurately reflects a critical design aspect of such screens. The openings in a continuous self-cleaning screen are purposefully shaped to facilitate effective separation of solids from liquids. The rectangular shape allows for a consistent flow of water while capturing debris, effectively enabling the removal of larger particles. The limitation on the height and width of these openings ensures that while the screen can effectively filter materials, it does not overly restrict flow rates or create blockages that could hamper the treatment process. This characteristic is essential because it directly impacts the screen's ability to function continuously and maintain self-cleaning properties. Other design and operational features, such as the integration of a wash press or systems that lift solids, may contribute to the overall efficiency but do not specifically characterize the fundamental nature of a continuous self-cleaning screen as effectively as the design and dimensions of its openings do.