Texas Wastewater Class B Practice Exam

What does Total Suspended Solids (TSS) refer to in water quality?

1. Solids that can be settled

2. Solids that cannot be filtered out

3. Solids that can be filtered out

4. Solids that are dissolved in water

The correct answer is: Solids that can be filtered out

Total Suspended Solids (TSS) refers to the solid particles in water that are not dissolved and can be filtered out, with the filtration typically using a specific method involving a filter. TSS includes a variety of materials such as silt, clay, organic matter, and biological organisms, which remain suspended in the water column and contribute to its turbidity. The correct answer highlights the nature of suspended solids, which emphasizes their ability to be captured through filtration processes. TSS is crucial for understanding water quality because high levels can harm aquatic life, affect water treatment processes, and indicate pollution. The choice regarding solids that can be settled is misleading, as TSS encompasses solids that may or may not settle out depending on their size and density. Likewise, the reference to solids that cannot be filtered out is incorrect, as TSS is defined precisely by its capability to be extracted through filtration. Additionally, the mention of dissolved solids is unrelated, as the term "total suspended solids" specifically refers to materials that are suspended rather than dissolved in the water.