What does the term "settleable solids" refer to?

The term "settleable solids" specifically refers to solids present in wastewater that can be removed through the process of settling. These solids typically include heavier particles, such as silt, sand, and other debris, that, due to gravity, will eventually settle to the bottom of a container or treatment system when allowed to sit undisturbed. In wastewater treatment processes, identifying and quantifying settleable solids is crucial because their removal significantly aids in reducing the overall solids load and improving water quality.

By removing these settleable solids during the treatment process, we not only enhance the efficiency of downstream treatment processes but also minimize the risk of clogging and other operational issues in treatment equipment. Understanding that settleable solids can be physically separated from the liquid phase underscores their importance in the overall design and operation of wastewater treatment systems.