Question

A countercurrent lamella settler module is to be installed in a conventional sedimentation tank that is 19m long, 3m wide, 3.4m deep. The flow through the basin is 500m^3/h. The settler module's lamella area 1.3m long, spaced at 5cm intervals, and inclined at 45 degrees. The module will occupy 50% of the tank surface area sp that the resulting velocity through the channels is 15m/h. Find the critical settling velocity of the lamella settler, and compare it to the overflow rate of the conventional sedimentation basin. By how much will particle removal increase?

Answer 1