What term refers to solids that float on the surface or are suspended in water or wastewater?

The term that refers to solids that float on the surface or are suspended in water or wastewater is "suspended solids." This category includes particles that are not completely dissolved in the liquid and can vary widely in size, composition, and concentration. Suspended solids can include organic materials, microorganisms, and inorganic substances, all of which can affect water quality and treatment processes.

Understanding suspended solids is crucial in wastewater treatment as they can contribute to pollution, clog filters, and hinder other treatment operations. Monitoring and managing these solids are essential for ensuring effective treatment and maintaining compliance with environmental regulations.

While biosolids, settleable solids, and sludge are related concepts within the context of wastewater treatment, they each encompass different characteristics. For example, biosolids refer specifically to treated solids that can be beneficially reused. Settleable solids pertain to particles that can be removed by sedimentation, while sludge is the byproduct of wastewater treatment that usually accumulates at the bottom of a treatment facility.