Tennessee Wastewater Operator Practice Exam

What is the primary goal of sludge screening in wastewater treatment?

1. Reduce chemical additives

2. Decrease the debris that collects in the digester

3. Enhance nutrient recovery

4. Improve energy efficiency

The correct answer is: Decrease the debris that collects in the digester

The primary goal of sludge screening in wastewater treatment is to decrease the debris that collects in the digester. During the treatment process, sludge can accumulate various materials that are not biodegradable or that could interfere with the digestion process. By screening the sludge, treatment facilities can remove larger particles, such as plastics, metals, and other non-organic materials, before they reach the digester. This removal is crucial because excessive debris can impede the functionality of the digester, leading to operational inefficiencies and potential safety hazards. Furthermore, efficient screening helps maintain optimum conditions for the microbial processes that break down organic matter in the digester. By minimizing the quantity of extraneous materials, the system can operate more effectively, resulting in improved treatment performance and less risk of operational disruptions. Therefore, the reduction of debris collected in the digester is a critical component of ensuring that the wastewater treatment process runs smoothly and efficiently.