The rate of flow through an ideal clarifier is 8000 m3 /d, the detention time is

ID: 1828774 • Letter: T

Question

The rate of flow through an ideal clarifier is 8000 m3

/d, the detention time is 1 h, and the depth is 3 m.

If a full-length movable horizontal tray is set 1 m below the water surface, determine the percent

removal of particles having a settling velocity of 1 m/h. Could the removal efficiency of the clarifier

be improved by moving the tray? If so, where should the tray be located and what would be the

maximum removal efficiency? What effect would moving the tray have if the particle settling velocity

were equal to 0.3 m/h

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