wastewater and sludge

Pumping of High Strength Sewage Sludge in Wastewater Treatment Plant

NEMO® BF hopper shaped pump with aBP-Module® prevents system downtime

The dewatered sewage sludge in wastewater treatment plants is particularly solid. Pumping the sludge poses challenges for wastewater treatment plant operators worldwide. As a global expert in complex fluid management, NETZSCH Pumps & Systems offers you the optimal solution for pumping solid sewage sludge.

We will show you how to prevent a plant shutdown due to clogging or bridging by using a NEMO® BF hopper shaped pump with aBP-Module® specially developed for wastewater treatment plants.

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Sludge, Sewage Sludge, Wastewater, NETZSCH, Pumps, Systems

Pumps for conveying dewatered sewage sludge

To be able to store and reuse the sludge from a wastewater treatment plant, later on, it has to be processed. At the wastewater treatment plant in Celle, the sludge is first dewatered in an angle press, and flocculant is added. The dry sludge is pumped from the wastewater treatment plant through a pressure pipe with 90-degree bends about 25 metres into a silo. It is then distributed from the silo to agricultural land. The sewage sludge later serves as fertiliser because of the nutrients it contains.

Solid sewage sludge causes daily pump breakdowns

Due to the high strength of the sewage sludge, there were frequent blockages and bridging in the wastewater treatment plant, resulting in operational downtimes. The downtime amounted to a total of three to four hours per week. The wastewater treatment plant needed a reliable pumping system to prevent plant shutdowns and the associated operational failures. 


percent dry matter contents can be pumped

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The NEMO® BF hopper shaped progressing cavity pump with aBP-Module® prevents bridging in all branches of industry.

NEMO® BF hopper pump with aBP modules® conveys solid sewage sludge

NETZSCH developed the NEMO® BF hopper shaped pump with aBP-Module®, especially for highly viscous, stab-resistant and crumbly media. This consists of a top shaft with flat spoked wheels mounted on the inside. The wheels sit deep in the shaft and close to the wall. If they rotate, this affects the material being conveyed, as if the entire sides of the shaft were moving. Thus, using the NEMO® BF pump to convey solid sewage sludge prevents clogging and bridging. 

At the wastewater treatment plant in Celle and many other operators, the pump system with the integrated bridge breaker has proven itself in continuous use. The robust hopper pump increases operational safety and prevents plant shutdowns even without tiresome inspection trips to the conveyor.

NEMO® BF hopper shaped pump with aBP-Module®

  • Medium: Sewage sludge
  • Throughput volume: 2 up to 5 m³/h
  • Rotations speed: Under 30 rpm
  • Pressure: 12 up to 15 bar
  • Dry matter contents: 25 to 35 %
  • Viscosity: Between 10 and 22 Pas
NEMO® BF hopper shaped pump with aBP-Module®, NETZSCH, Pumps, Systems