Tennessee Wastewater Operator Practice Exam

What are total solids in the context of wastewater?

1. Only suspended solids found in wastewater

2. Only dissolved solids present in wastewater

3. All solids present in the wastewater, including both suspended and dissolved

4. Solids that have settled at the bottom of treatment tanks

The correct answer is: All solids present in the wastewater, including both suspended and dissolved

Total solids in the context of wastewater refer to the aggregate amount of all solids contained within a sample, which includes both suspended and dissolved solids. Suspended solids are those that are not dissolved and may float or remain in the water, while dissolved solids are primarily those that have been dissolved in the water to a degree that they do not settle out under normal circumstances. This comprehensive measurement is crucial for assessing water quality and treatment efficiency because both types of solids can significantly impact the health of aquatic ecosystems and the effectiveness of wastewater treatment processes. By measuring total solids, operators can gain insights into the concentration of contaminants and the efficacy of the treatment methods being used. This holistic approach allows for a better understanding of the overall composition of the wastewater, which is essential for compliance with environmental regulations and for the operational management of wastewater treatment facilities. The definition clearly distinguishes total solids as including all fractions rather than isolating specific components like suspended or dissolved solids.