The flow rate to, and hence ...

The flow rate to, and hence the Lamella Plate Separator rating (Flow Rate) is critical. The surface area of the plate packs is what determines the rating coupled to the volumetric capacity. The calculation for settling is based on the surface area (m2) and the flowrate (m3/hr) resulting in m3/m2.hr which must be less than 1.0 m3/m2.hr for theoretical settling i.e., A flow rate of 35m3/hr/40m2 (plate pack surface area) = 0.875 m3/m2.hr. Additionally the size of the solids and the quiescent settling velocity will determine the settling rate. In order to ensure the solids are of a size sufficient to settle in less than the retention time (clarifier volumetric  capacity) perform jar testing using flocculants to optimise the settling time. The intermittent bleed of the flocculated settled solids from the cone of the clarifier is crucial to ensure the Lamella Plates are working in the ideal zone.