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Sludge dewatering at wastewater treatment plants

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Inefficient operation waste water treatment plant

The operations of the WWTP can be more efficient.

In the process of purifying wastewater, water and sludge is released, which must be separated from each other. Currently, the sludge at the waste water treatment plants is dewatered with Poly-Electrolyte (PE) in, in particular, centrifuges and sieve presses. The aim is to achieve the highest possible dry matter percentage, so that the transport costs remain low and energy generation and recovery of raw materials is more feasible. However, the application of PE ensures high operational costs, high energy consumption and possible exotoxicological risks for the aquatic ecosystem.


Brush centrifuge

The brush centrifuge is a dewatering machine. In nature, sedimentation of silt and clay is best achieved between plants on the water bottom. The turbulence is low, so that the particles can settle undisturbed. This process is imitated in the brush centrifuge.



  • No PE is required for separation and dewatering.


  1. Topic Water chain
  2. Development state 5: Component and/or breadboard validation in relevant environment
  3. Water type Effluent

Submitted innovation Award

Water Innovation Award