Inlet system for circular secondary clarification tanks

• Feed distribution to the full tank circumference
• High surface overflow rate
• High surface sludge load
• High operational safety

The settlement characteristics of a secondary clarification tank are affected significantly by the inflow system design. Poor inlet arrangements result in several problems that may compound and lead to a high concentration of filterable material in the effluent.The feed energy can be minimised if the influent is distributed over the entire tank circumference. In this way the inflow velocity is significantly reduced, resulting in a very favourable hydraulic tank flow.

With the HUBER Opti-Flow System the feed is introduced through a circular pipeline installed at depth around the inner tank wall. The circular pipeline is optimised for the whole range of flows, ensuring minimal inflow energies and uniform inflow distribution all over the full tank circumference. Clarified water is discharged either at the tank rim or centre, depending on the tank configuration.