SOUTH DAKOTA Department of
Environment & Natural Resources

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Surface Water

Preliminary Treatment

picture of a screen

Operations to eliminate large objects and grit, often referred to as preliminary treatment, are an integral part of the treatment process. Effective removal of these solids may require a combination of unit operations such as screening, grinding, and settling. The unit shown is a bar screen, which is used to remove coarse solids from wastewater. Coarse solids consist of sticks, rags, boards, and other large objects that often, and inexplicably, find their way into wastewater systems. The purpose of screens is to protect pumps and other mechanical equipment and prevent clogging of valves in the wastewater treatment plant.

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