Dewatered Sludge Cake Pumping Solutions for Waste Water

The Solids Pumps from Saxlund International have been reliably conveying all types of sludge cake for many years. Pumping sludge cake keeps it separate from its surroundings and the environment with unpleasant odours are now a thing of the past. Even problem sludge cakes can be pumped without risk.

Maximum reliability

Our many years of experience are your guarantee of maximum reliability, even when pumping over long distances or 24h a day.

  • Cost-effective modular system
  • Vertical or horizontal versions as required.
  • Hydraulic seals mean lower wear.
  • Optional pump arrangements give compact design
  • Wear indicator
  • Easily extended by adding extra pump units in parallel
  • Valves easily exchanged due to top-entry design
  • Upstream twin-shaft screw for optimum filling ratio

Advantages of the Saxlund Solids Pump

From wastewater to centrifuge sludge, Saxlund solids pumps pump almost all sludges from municipal or industrial wastewater.

  • No pulsation damper required
  • The pump operates without excessive vibration and is silent.
  • The pipeline is shock free.
  • There is no backflow loss as with a valveless pump, i.e. energy consumption is lower.
  • The dosing accuracy of the pump is optimal as there is no backflow.
  • Low wear as the valve sealing surfaces do not slide under pressure on each other.
  • No central grease lubrication required.
  • The modular design makes emergency operation possible by changing from two to one-cylinder drive mode.

Technical specification

  • Pressure range: 40…100 bar
  • Flow rate: 1…50 m³/h
  • Piston diameter: 180/250/300 mm
  • Stroke: 500…2000 mm
  • Foreign parts up to 200 mm
  • Dry Solids Content up to 45 % (depends on the flow behaviour of the material to be pumped). If your products exceed these limits we’ll find a solution


The maintenance effort is kept as low as possible:

  • No disassembly of suction and discharge lines necessary.
  • Replacement of wear parts is possible with minimal effort and without specialist personnel.
  • Optional demountable delivery pistons available with easily replaceable standard seals or one-piece pistons with integrated seals.

Managing Sludge Cake Feed into your Solids Pump

Saxlund has two different sewage sludge feeding systems available, which in conjunction with our numerous types of pumps, serve all arrangements and scenarios. With sewage sludge cake with low dry solids content, the product can be fed via an agitating hopper. With higher dry solids content the feed is by a pre-press screw. The pre-press screw unit basically consists of two worm screws rotating in opposite directions. These compress the material to be conveyed before it reaches the pump and so ensure an optimum pump filling ratio. Furthermore, the dual screws are arranged such that a self-cleaning effect is achieved.

Hydraulic Drive Technology for Solids Pump

All Saxlund International Solids Pumps are driven hydraulically. This enables the hydraulic power pack to be conveniently located away from the pump, if required. To guarantee economic operation, Saxlund can offer you a large choice of hydraulic units. Whether you are driving just one Pump or wish to provide drive power for a complete system, Saxlund International can supply the right drive to meet your needs exactly.

Interception of oversize materials

The inclusion of an oversized material strainer is recommended to protect downstream equipment from oversized solid matter. The strainer cleaning interval is indicated by measuring the differential pressure between the inlet and outlet ports. Cleaning is no problem, owing to the simple construction of the strainer.

Boundary Layer Injection - for extending the distance

To reduce the friction losses when pumping particularly cohesive or highly viscous products, the Saxlund range includes a boundary layer injection station. The injection of polymers with high molecular weight creates an artificial lubricating film between the inside wall of the pipe and the material being pumped.

Therefore, for the same Pumping distance, a pump with more favourable energy requirements can be used.

Contact us

For more information about any of our products: