Hydrodynamic separators are flow-through, often proprietary structures that establish a high-speed rotating flow within a cylindrical chamber. Larger particles in the rotating stream have greater density than smaller particles to follow the tight curve of the stream, and thus strike the outside wall, falling to the bottom of the chamber where they can be later removed. While this means of settling does not always occur in this manner, generally the larger, more dense particles well settle to the bottom of these devices.
This page provides links to pages addressing pretreatment hydrodynamic separation devices.
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