​Secondary sludge pumping (RAS/WAS) is a part of the treatment plant process. Return activated sludge (RAS) is continuously pumped back into the secondary biological treatment tank as part of the treatment process. Excess from the settled sludge, which is waste activated sludge (WAS), is pumped to the sludge handling process. 
Related applications include pumping sludge from septic tanks, industries and other wastewater treatment plants into the process. 

Application challenges:

  • Handling heavy concentrations of sludge is a complex process
  • Ability to handle heavy sludge with high concentration of solids (often up to 8-10 %)
  • Continuous duty operation

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