Tennessee Wastewater Operator Practice Exam

What is the likely effect of receiving large quantities of grease on a perforated plate type screen?

1. Improved flow through the screen

2. Blinding of the screen

3. Increased effluent quality

4. Reduced energy consumption

The correct answer is: Blinding of the screen

Receiving large quantities of grease on a perforated plate type screen can lead to blinding of the screen. When grease accumulates on the screen, it forms a layer that can obstruct the openings, preventing water and other materials from flowing through as intended. This blockage not only hinders the flow but can also create back pressure, potentially leading to further operational issues in the wastewater treatment process. In addition to reducing the flow through the screen, blinding can significantly impair the efficiency of the treatment system, as it can necessitate more frequent maintenance or cleaning, increasing operational costs and downtime. Therefore, understanding the impact of grease on screening mechanisms is essential for the effective management of wastewater treatment facilities.