Tennessee Wastewater Operator Practice Exam

What is a potential consequence of returning digester supernatant with a high TSS concentration?

1. Decreased nutrient availability

2. Increased effluent turbidity

3. Improved sludge digestion

4. Enhanced gas production

The correct answer is: Increased effluent turbidity

Returning digester supernatant with a high total suspended solids (TSS) concentration can lead to increased effluent turbidity. High TSS levels in the supernatant contribute to cloudiness in the effluent, which can be problematic for water quality and treatment processes. Increased turbidity can hinder the effectiveness of disinfection processes, affect aquatic life, and violate regulatory standards for discharged water. In contrast to options that suggest beneficial outcomes, such as improved sludge digestion or enhanced gas production, the presence of high TSS is generally viewed negatively in wastewater treatment processes. While nutrient availability might be affected, the immediate and observable consequence of high TSS in the effluent is evident through increased turbidity, making it a critical concern for operators managing wastewater treatment facilities.