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Passavant Screw Press PSP

Passavant® Screw Press Sludgless represents innovation in the design and provides an economic solution for either sludge thickening or dewatering at small to medium water, wastewater effluent treatment works. The system can operate automatically or manually – either continuously or intermittently for batch processing. Sludge thickening of up to 8 % DS or sludge dewatering of up to 22 % DS are attainable depending on the flocculation reaction and sludge type.

Unique Selling Point

Easy operation and maintenance:

  • Simple mechanized operation
  • Compact, low space requirement
  • General low investment costs for small and medium size STP's
  • Low operating costs due to low energy consumption
  • Main parts of the machine are in bolted section to grant an inspection and maintenance access


Passavant® Screw Press Sludgless consists of a static circular drum with an internal screw conveyor. The drum is fabricated in stainless steel using a special wedge-wire screen profile with large surface to obtain optimum liquid drainage characteristics. The flocculated sludge enters the inlet chamber into the drum zone where it is conveyed by spiral movement and is gradually compacted. The liquid continuously drains through the drum wedge-wire screen and gravitates to the filtrate outlet where it can be discharged or returned for treatment. Spry nozzles together with the cleaning system wash the drum screen section. Eventually the solids will pass into the discharge section and to the outlet where they can be collected into a container or conveyed for eventual disposal. All main parts of the Passavant® Screw Press Sludgless are bolted to grant an easy and fast maintenance. Washing system with nozzles and internal cleaning device to wash the internal drum screen section.


Sludge Dewatering

Dewatering is one of the most important processes in the entire water treatment procedure. As the burning of sewage sludge, or its disposal at a landfill site, both involve costs, sludge dewatering pays off, particularly when several...


Locations and Contact


Aqseptence Group (India) Private Limited, Ahmedabad

Sales and Manufacturing Location
E-540, GIDC, Sanand-II Industrial Estate,
Village: Bol, Tak: Sanand,
Gujarat 382170, Ahmedabad

Tel: +91 2717 618000



Aqseptence Group Carpi Srl, Limidi

Sales and Manufacturing Location
Via Pitagora 30
41010 Limidi Di Soliera, MO

Tel: +39 059 525720

Fax: +39 059 525443



Aqseptence Group SAS, Availles-en-Chatellerault

Sales and Manufacturing Location
Zone Industrielle
86530 Availles-en-Châtellerault

Tel: +33 5 4902 1600

Fax: +33 5 4902 1616


Middle East

Aqseptence Group FZCO, Dubai

Sales Location
East Side 5EA, 7th floor, 722
P.O. Box 371082
Dubai Airport Free Zone
United Arab Emirates

Tel: +971 42278456



Aqseptence Group Pty Ltd., Brisbane

Sales and Manufacturing Location
88 Brickyard Road,
Geebung 4034 QLD
PO Box 85, Virginia DC,
QLD 4014

Tel: +61 7 3867 5555

Fax: +61 7 3867 5566


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