Question

Design high-rate sedimentation tank(s) for a water treatment plant using plate settlers.

1. Design the rectangular sedimentation tank(s), including launders and sludge collection mechanism.

2. Design the countercurrent plate settlers, including length, angle, and distance between plates (to achieve 100% removal of the target particle described below).

3. Draw a cross-section of the sedimentation tank with dimensions, indicating the concrete walls, main pipes, launders, plate settlers.

4. Quantify/discuss the improvement(s) that may result from installing the plate settlers.

Inputs:

Design flow = 1 m3/s

Target particle: radius = 0.05 mm, specific gravity = 2.50, and water temperature = 20

Answer 1