Submersible recirculation pump type ABS RCP

Efficient recirculation in activated sludge

The RCP is Sulzer’s standard range of recirculation pumps, specifically designed for pumping and recirculation of activated sludge in the denitrification/nitrification process of a wastewater treatment plants. This compact and easy-to-handle pump is efficient and reliable. RCP pumps are designed for large flows and low heads between 0.1 and 1.8 m (4 to 71 in). Compared to conventional axial flow pumps, recirculation pumps do not require expensive structures in the tank, such as inflow chamber and a large rising pipe.

Submersible recirculation pump type ABS RCP for pumping and recirculation of activated sludge in the denitrification/nitrification process
Main benefits
  • Compact design
  • High efficiency
  • High reliability
  • Easy handling
Main applications
  • Recirculation of activated sludge
Main design features
  • Full stainless steel version (optional)
  • Self-cleaning propeller
  • Silicon carbide (SiC/SiC) mechanical seal protected by means of solid deflection ring
  • Condition monitoring (temperature, water ingress)
  • 100 000 hour bearing lifetime
  • The unit is lowered along a guide tube and connected to the pipeline by an automatic coupling system.

Key characteristics
Max. flow 4,500 m³/h (20,000 US gpm)
Max. head 1.8 m (6 ft)
Discharge sizes DN 250-800 (10"-32")
  • Industrial water and effluent treatment
    Sulzer has a deep knowledge in wastewater treatment, and with our wide product portfolio we can now offer energy-efficient and reliable solutions for your water collection, neutralization, flocculation, sedimentation, cooling, aeration, sludge storage, digestion, and dewatering processes.

  • Mixed liquor recirculation
    When denitrification is followed by a physically separated nitrification step, the nitrates formed during nitrification must be recirculated. The nitrates are pumped back into the denitrification step, where the anoxic process splits the nitrate molecules into nitrogen and oxygen. This frees the nitrogen into the air. This application is best served by submersible recirculation pump types ABS XRCP and RCP, the submersible mixed flow column pump type ABS AFLX and the submersible propeller pump type ABS VUPX.

  • Tertiary treatment
    Treated wastewater may occasionally require further treatment. Local discharge rules may pose strict limits that cannot be fulfilled by even the most effective process, or a higher quality of effluent may be requested for its reuse. When tertiary treatment is needed, various levels of filtration can be applied, including very fine filtration. Often, however, a final step of mixing and aeration is sufficient to achieve the target. When this is the case, Sulzer's submersible mixer types ABS XRW and RW can be used, along with submersible aerator type ABS TA–TAK and disc diffuser system types ABS PIK, DS and Sucoflow.
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