Sludge Treatment

CylinderPress™ for sludge treatment dewaters primary, secondary and overflow sludge from the sewage treatment plants' digesters and biogas reactors.

Municipal Sludge Dewatering

Domestic Wastewater and Sludge

Domestic wastewater is harmful to the environment due to the presence of high oxygen-demanding material, nutrients, suspended solids, pathogenic organisms, organic compounds and other contaminants.

Sludge is produced in large amount in the process of wastewater treatment. Sludge is typically subject to dewatering prior to disposal. Dewatering serves the following purposes.

  • Reduces volume, saving money on storage and transportation.
  • Eliminates free liquids before landfill disposal.
  • Reduces fuel requirements if the residuals are to be incinerated or dried.

CylinderPress™ Dewatering Technology

CylinderPress™ dewatering technology functions as follows:

  • Feeding: Sludgde is feeded into the plant
  • Solid-liquid separation: The solids are mechanically retained by a filter, allowing only for the liquid to pass through.
  • Dewatering: The solid cake is subsequently passed through a dewatering step in which the residual moist is removed.
  • Consolidation: The solid cake is consolidated and discharged
  • Cleaning: Mechanical brushes and a backwash system are finally applied to remove solid cake from the filter surface and clean any potentially clogged holes. The continous cleaning process furthermore reduces the risk of struvite formation.

The CylinderPress™  dewatering plant can be customized to your volume and space requirements, is easily retrofitted to any process line and compatible with many process monitoring systems.

Customer advantages

Economical thickening of sewage sludge

Sewage sludge accumulated in the biological stages of the treatment process is thickened from dry solids content of 5%. The thickened sewage sludge can then be pumped into a digester.

Tollson has designed the CylinderPress™ ST for sludge thickening. The CylinderPress™ ST has decisive advantages over other solutions for thickening of sludge.

  • Low power consumption
  • No or low polymer consumption 
  • Suitable for processing mixed and primary sludge 
  • Low noise level
  • Easy adjustment of the filtration degree
  • Compact design, low space requirement
  • Limited need for routine maintenance

Cost-effective dewatering of sewage sludge

In order to transport, recycle, dispose or incinerate the dewatered sludge, it is essential that the sludge has a high dry solids content. Further important factors are the economical use of polymers, water and energy as well as reduced wear. All these success factors have been taken into account at Tollson. The result of this is the CylinderPress™ SD.

  • Low power consumption
  • High dry solids with minimum polymer consumption 
  • Suitable for processing mixed and secondary sludge 
  • Low noise level
  • Compact design, low space requirement
  • Limited need for routine maintenance

6 facts on CylinderPress™ in sludge treatment

Comparable dry matter content

CylinderPress™ can achieve dry matter contents similar to other separation technologies.

Reduced polymer dosing

Since the technology is not based on coagulation/flocculation, high doses of polymer flocculants are not necessary for sludge thickening or dewatering processes.

Low power requirement per m3 sludge

In comparison with decanter centrifuges, we have considerably reduced power requirements. When dewatering sewage sludge, CylinderPress™ require 50% less power compared to centrifuges.

<75 dB noise level, thanks to innovative technology

CylinderPress™ is a mechanical filtration technology where high rotational speeds are not present. Compared to other technologies, this also entails less vibration. The volume of the CylinderPress™ is reduced to <75 decibels through suitable measures.

Reduced struvite deposition

A washing mechanism continously keeps the filters clean, thus preventing struvite scale buildup by lowering the pH and dispersing/inhibiting the formation of struvite.

Maintenance only when needed

To prevent failures, mechanics at sewage treatment plants should perform minor maintenance once a year. When needed, major maintenance is only to be done by a Tollson mechanic. The machine is completely checked here.