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Sites with highly fibrous and dry solids content

Ideal for dewatering difficult sludges of dissolved air floatation (DAF) and biological (aerobic and anaerobic) sludge and raw effluent flows that are prone to clogging traditional filter materials, especially those with;

  • high oil and fat content
  • high moisture content
  • low solid concentration
  • high viscosity, presence of toxic substances

The Volute DUO offers all of the advantages of the Volute FS screw press range but features twin counter-rotating screws within a single drum to break up and move materials that typically bind and harden during pressing.

Application 

  • Industrial wastewater and trade effluent  
  • Utilities and municipal wastewater
  • Hiretrial or capital purchase  
Volute Duo

Product highlights

This design enables full mechanical dewatering and thickening of even the most difficult sludges without compromising performance or risking operational failure.

  • Reduces power consumption of dry solids by up to 90% compared to a centrifuge

  • Handles sludge as dilute to 0.5% TS 

  • Allows processing of low-concentration sludges – having a TS of 0.5% or more

  • Uses up to 95% less rinsing water compared to a belt press and a centrifuge

  • Reduces the cost of sludge dewatering by over 50%.

  • Very low maintenance - no moving rings contact within the Duo

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Energy efficiency and low-maintenance

  • Quiet, odour-free operation
  • No pre-thickening required
  • Clog-free self-cleaning mechanism
  • Fully automated system minimises oversight and OPEX cost
  • Sensor-controlled operation - automatically run for 24-hours 
  • The screws inside the cylinder rotate at a very low speed – approximately 2 to 4 rpm – consuming very little energy
  • Extending the lifetime of consumable parts - the moving rings are driven by an external driveshaft to prevent contact with the screws
  • Expandable controls to link to external tanks, conveyers, waste bulkers technologies

  • Adjustable CIP systems to auto- clean between batches or low levels

  • Self-cleaning filter for stable and constant dewatering 

  • Low maintenance and operator interaction with automatic stop/start

Manufacture

  •  All-in-one design and easy to install
  • Designed with a smaller footprint than the standard Volute Dewatering Press
  • Siemens HMI control panel can link to existing SCADA systems
  • Compact flocculation tank
  • Extendable base option allows for future proofing by increasing throughput
  • Skid mount, containerised and floor mounted available

Chemicals

  • Chemical regime optimised for use with our technologies

  • Duo can incorporate PH correction if required

  • Optional dynamic mixer reduces polymer use

Hire and trial

  • Container and skid mounted options

 

chemicals
lab analysis

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Specialist in wastewater and trade effluent solutions to help bring your site into consent.

How the process works

The Volute Duo Screw Press is designed to efficiently dewater sludge while overcoming the clogging and maintenance issues found in traditional screw presses.

Unlike conventional designs that rely on fixed openings, which can become blocked with solids over time, the Volute Duo Screw Press features a self-cleaning mechanism. Its alternating fixed and moving rings continuously clean the fine gaps, ensuring consistent water release and preventing blockages. This allows for a more compact and efficient press, reducing the need for oversized equipment while maintaining high dewatering performance.

A key advantage of the Volute Duo Screw Press is its friction-less operation, where the moving rings are guided by an external drive mechanism, preventing direct contact with the screw. This eliminates wear points, greatly extending the lifespan of consumable parts and reducing maintenance requirements.

Additionally, the system operates at a low screw rotation speed (2–4 RPM), resulting in significantly lower energy and much reduced water consumption compared to alternative dewatering technologies. The fully enclosed design further enhances performance by minimizing odours and noise, making it an ideal solution for facilities requiring reliable, cost-effective, and low-maintenance sludge treatment.

 

Site and application examples

For sites with higher fibrous and dry solids in the sludge content:

  • Primary sludge such as DAF
  • Secondary treatment sludges such as activated sludge
  • Aerobic and anaerobic bio solids
  • Digestate dewatering 

Site application examples:

  • Food and beverage such as:
    • Abattoir

    • Diary

    • Consumer food and beverage products

    • Raw agricultural goods 

  • Utilities and municipal wastewater
  • Waste management/remediation services 

  • Personal care and cosmetics 

  • Pharmaceutical 

  • Aggregates and raw materials 

  • Chemicals manufacture  

  • Metal finishes, mining and quarrying 

  • Automotive 

  • Fish farms and livestock manure  

  • Machinery manufacturing/metal processing plants  

  • Paper mill and glass factories 

Case studies and contract wins

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