Suction Pipe Clarifier


Suction or draw-off pipes are equally spaced along the rake arm to draw off settled sludge across the clarifier.  Blades on the rake arm are arranged in a “V” pattern to direct the collected sludge towards the Suction Pipe.  A RAS valve, located in the RAS Box, on each individual suction pipe allows the flow from each pipe to be adjusted to optimize the solids removal from the clarifier leading to potential higher RAS concentrations.


1.    Rapid removal of settled solids across the entire basin floor.
2.    Optimization of the flow removal across the clarifier bottom as process conditions change.


1.    Potential plugging of the suction pipes and, in particular, the valves.
2.    A seal must be maintained between the rotating RAS box the clarifier center column.
3.    Highest capital cost of all clarifier designs.
4.    The required RAS valve box makes adding an Influent Dispersion Well (sometimes referred to as a Energy Dissipation Well or EDI) difficult.
5.    Many times the Suction Header Clarifier is not utilized to its full potential due to the higher sophistication of operation.