| 摘要 |
A grit selector having an upper settling chamber and a lower grit storage chamber. The settling chamber communicates with the storage chamber through a relatively small opening in a flat transition surface therebetween. Rotating paddles critically positioned within the settling chamber cause the flow of liquid entering the settling chamber adjacent the outer periphery to rotate about the chamber in a forced vortex having upward spiral flow. Settled grit attaches to the transition surface at the settling chamber perimeter before one revolution. The spiral flow urges the grit across the transition surface towards the opening while the organics are lifted upward and back into the flow. The grit drops through the opening into the grit storage chamber and the organics are carried out of the settling chamber through an outlet passageway. A unique air scour arrangement is provided to remove any organic material which has settled in the grit storage chamber and an air lift is provided to remove the settled grit from the grit storage chamber.
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