Mechanical Treatment of Stormwater and Combined Sewer Flows

Stormwater and combined sewer flows can vary strongly in flow rate and may carry large amounts of grit, debris, leaves and other solids. Reliable pretreatment is needed to protect downstream structures and equipment.

The process is selected according to peak flows, contaminant characteristics, available space and the downstream water route. Mechanical treatment may include screens, sieves, grit removal and other pretreatment units.