The challenge

After initial decanting and aeration in ponds, the wastewater goes through anaerobic degradation. This is followed by an anoxic/aerobic treatment with an activated sludge process and nitrification/denitrification. At this stage, the pumps initially installed for the return of activated sludge (RAS) were facing regular problems with frequent stoppage and unplanned maintenance. The situation was especially critical for some screw centrifugal pumps because of expensive spares. It was, therefore, decided to change these pumps to more reliable and economical ones.

The solution

After a thorough analysis of the activated sludge characteristics, Sulzer offered the sewage pumps type ABS XFP with Contrablock Plus impellers and Premium Efficiency IE3 motors. The Contrablock Plus impeller has been especially engineered to handle tough requirements. It provides excellent blockage resistance with a large free solids passage. The Premium Efficiency IE3 motors are explosion proof ATEX certified, conform to IEC 60034-30 and exceed CEMEP EFF1. Because of the dry installation, the XFP pumps were provided with an internal closed-loop cooling system.

Sulzer’s pumps and agitators are running smoothly at every stage of the sugar and bioethanol processes. We trust Sulzer’s equipment also for our demanding wastewater applications. The XFP pumps installed in the WWTP are extremely reliable and reduce the maintenance costs.

Production Manager, Tereos Dobrovice

Customer benefits

In the sugar and bioethanol industries, robustness and reliability of the equipment are of paramount importance. The XFP pumps were taken into operation in 2013 and have been running continuously since then, without any interruption or specific maintenance. In addition, the XFP pumps have highly efficient motors and hydraulics, which make them the most efficient wastewater pumps on the market. In the activated sludge recirculation process, Tereos Dobrovice has achieved a reduction in the power consumption. This not only saves money, but also means a healthier environment and reduction of the carbon footprint.

The Sulzer difference

  • Sulzer has thorough experience in the sugar and bioethanol markets, with deep process knowledge and an extensive installed base. Furthermore, Sulzer is a worldwide player in the design and manufacture of pumping, mixing and aeration equipment for industrial wastewater treatment.    
  • The XFP pumps with the new Contrablock™ Plus impeller and efficient hydraulics are robust, reliable and economical.
  • The measured reduction in the power consumption of the process gives cost savings and contributes to a healthier environment as well as reduction of the carbon footprint.
  • Sulzer offers customized solutions and strong service.
Product specification
XFP 151E-CB2 PE60/4 XFP 201G-CB2 PE110/6
Quantity 2 1
Maximum flow 340 m3/h 660 m3/h
Motor Premium Efficiency IE3 Premium Efficiency IE3
Power P2 6 kW 11 kW
Maximum head 9.2 m 10.3 m
Impeller diameter 216 mm 285 mm
Voltage 400 V 400 V
Frequency 50 Hz 50 Hz
Mechanical seal Double SiC/SiC Double SiC/SiC
WWTP process chart
Integrated wastewater treatment process flow chart in Tereos Czech Republic sugar and bioethanol plant
Integrated wastewater treatment plant process flowchart
  • Submersible sewage pump type ABS XFP
    Submersible sewage pumps type ABS XFP are the best choice for ensuring efficient and reliable pumping in any wastewater pumping station. The submersible wastewater pumps, mainly installed in network pumping stations, are equipped with Premium Efficiency IE3 motors as standard and with the ContraBlock family of impellers.
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