Piston pump, Push floor, Sliding frame, Truck reception, Waste water

Reception of Sludge Cake at WWTP Stuttgart

Complete system comprising of Saxlund Push Floor Reception Bunker, two Saxlund Piston Pumps, Saxlund Sliding Frame Storage Silo and two additional Piston Pumps

Case study

Reception of imported sludge at WWTP Stuttgart

On Stuttgart main sewage plant Saxlund an additional way of waste disposal for communal sewage sludge has been created. The imported sludge and internal sludge were dried and burnt in a Mono incineration plant. Saxlund has provided the complete storage, discharging, conveying and metering facilities.

The imported sludge cake is delivered by tipping truck to a reception bunker equipped with Saxlund Push Floor Discharge. It is fed efficiently via the combined discharge/pre-press screw to the two Saxlund Duplex Solids Handling Pumps.

The pumps convey the sewage sludge to the storage silo. From the storage silo, the sewage sludge is pumped via the reliable Saxlund Sliding Frame discharge and Solids Handling Pump via distributor valves into dryers.

For the protection of the following machines, a foreign body separator is installed in the pressure pipeline and retrains foreign parts exceeding 30mm.

To prevent loss of pressure, the long piping has been fitted with a lubricant dosing device. Every silo is fitted with a continuous level indicator and frost protection. Another special feature of this plant is that you can pump with both reception pumps in the silo with high conveying capacity as well as directly in the drying with a high conveying pressure.

The especially foreign sludge developed for large quantities Duplex Solid Handling pump with free cross-sections in the entire loading range of 250 mm combines the advantages of the switch pumps and valve-controlled pumps. Extremely low wear and high availability features of these pump types.

Technical data





Sewage sludge

Bulk density


Dry solids content



Reception silo with Push Floor Discharge

Silo capacity

100 m³

Discharge rate

2x 30 m³/h

Discharge/pre-press screw, type

2x DDA


2-Cylinder Solids Pump

Duplex Solids Handling Pump, type

SPx 2250-1500

Conveying capacity

30 m³/h

Conveying pressure, max

40 bar

Motor rating

110 kW

Pipework, DN200 PN100

2x40 m


Circular Storage Silo with Sliding Frame Discharge

Silo capacity

500 m³

Discharge rate (variable)

16 m³/h

Discharge screw, type



2-Cylinder Solids Pump

Solids Handling Pump, type

SP 2180-1000

Conveying capacity (variable)

16 m³/h

Conveying pressure, max


Motor rating


Pipework, DN200 PN100

Approx. 100 m