Progressive Cavity Sludge Pumps
Engineered positive-displacement pumping for primary sludge, RAS, WAS/TWAS, digester sludge, thickened sludge and dewatering feed applications.
Sludge is not a single fluid
Progressive cavity sludge pumps are used in municipal and industrial wastewater systems where viscosity, solids concentration and changing process conditions make controlled positive-displacement pumping advantageous. A pump that performs well on relatively dilute activated sludge may require a different configuration, inlet arrangement or operating speed for thickened or digested sludge.
Positive displacement can maintain useful transfer rates as sludge consistency increases.
Progressing cavities can transport many wastewater solids when inlet geometry and pump size are appropriate.
Useful where unnecessary agitation of biological or conditioned sludge is undesirable.
Capacity is approximately proportional to speed, providing useful VFD turndown.
Sludge Pump Applications
Select an application for more detailed engineering guidance.
RAS Pumps
Controlled return activated sludge recycle to the biological process.
View application →02WAS & TWAS Pumps
Waste and thickened waste activated sludge transfer.
View application →03Digester Sludge
Viscous, variable sludge transfer and selected recirculation duties.
View application →04Thickened Sludge
High-consistency sludge where suction design becomes critical.
View application →05Filter Press Feed
Controlled feed through a cycle of increasing discharge pressure.
View application →06Belt Press Feed
Stable sludge loading coordinated with polymer and belt speed.
View application →07Screw Press Feed
Repeatable continuous feed for screw press dewatering systems.
View application →Define the sludge before selecting the pump
Reliable sizing starts with the process data, not only gallons per minute. Thickened and abrasive sludge can change suction performance, required torque and rotor/stator life substantially.
Rotor, stator and operating speed
Abrasive grit and solids can accelerate wear at the rotor/stator interface. Rotor material or surface treatment, stator elastomer, interference, pressure staging and operating speed should be selected for the actual service.
Elastomer compatibility should be checked against sludge chemistry, process temperature and cleaning agents or hydrocarbons that may enter the stream.
Protect the pump
PCPs are positive-displacement machines, so discharge-pressure protection is essential. Prolonged dry running should also be prevented because the pumped fluid lubricates and cools the rotor/stator interface.
- Pressure monitoring
- Dry-run protection
- Motor overload protection
- VFD speed limits
Need help selecting a sludge pump?
Send us the fluid description, solids concentration, viscosity if known, required flow, discharge pressure, suction conditions, temperature and existing pump information.