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Cost saving Solid-Liquid separation for Aquaculture

The Fournier Rotary Press™ excels in reducing the volume of all kinds of sludge and fish slurries, offering exceptional solid-liquid separation solutions that help landbased fish-farms and slaugtheries achieve environmental waste compliance, reduced transport and operational costs.

Transforming Aquaculture's Challenges with Rotary Press Technology

In an era where aquaculture is under the microscope, the industry faces a stream of challenges, each demanding a sustainable and cost-effective response. The treatment of wastewater, the handling of organic by-products, and stringent legislative compliance are at the forefront of the sector's hurdles.

Wastewater treatment is not just about compliance; it's about doing so economically. The FOURNIER Rotary Press™ technology presents an innovative solution that addresses this need by optimizing on-shore and on-vessel wastewater processing.

By streamlining operations, this technology reduces costs and enhances the efficiency of treating wastewater streams, ensuring the treatment process is not only compliant but also financially viable.


The handling of dewatered sludges is traditionally marred by high transportation costs. Rotary Press Technology redefines this narrative by maximizing dewatering efficiency, reducing sludge volume, and consequently cutting down on transport expenses. This innovative approach not only lowers operating costs but also opens up potential revenue streams from the by-products of aquaculture waste.


Navigating Tight Regulations

Legislative demands, often complex and stringent, require a precision-oriented approach to compliance. With the Rotary Press, businesses can achieve higher capture rates and cleaner discharge, surpassing regulatory thresholds. This not only shields businesses from compliance risks but also establishes their reputation as environmentally responsible entities.

Data-Driven Equipment Selection

Data-Driven Equipment Selection

The increased efficiency and high capture-rate of the Rotary Press offers many advantages over other separations methods. High cake-dryness and increased capture-rates enhances ammonia stripping and enables a better functioning, more efficient and resilient process chain.

Choosing the best equipment for aquaculture waste treatment has often been a subjective decision; however, recent legislation calls for 'Best-in-Class' solutions, and the Rotary Press Technology fits nicely into this category. Our solutions change the game by providing concrete performance data, enabling decision-makers to select equipment based on hard facts and tangible outcomes.


With Rotary Press Technology, the aquaculture industry can benefit from:

  • Lowered operational costs through efficient waste treatment.
  • Reduced volume and transportation costs of dewatered sludges.
  • Easier compliance with environmental regulations.
  • Improved solid-liquid separation efficiency eliminates need for further processes downstream.
  • Low power and polymer consumption.

This technology not only offers a robust response to the industry's immediate challenges but also paves the way for a more sustainable and economically viable future in aquaculture. By embracing the Rotary Press, businesses can turn their pain points into milestones of environmental stewardship and operational excellence.

Typical Rotary Press data

Key features

Performance data is supported by lab sludge testing and full-scale pilot tests using our containerized pilot test units, enabeling test-data at an industrial scale.


Slow Rotational Speed

Slow rotation speeds between 0.3 and 2 rpm,  produce high cake TS%  The low speed reduces noise and virberations, minimizing wear and extending service life.
Typical life-cycle 20+ years.

Low Energy Use

Energy consumption tailored to sludge type, from 2 to 7 kW/hr per dry ton of sludge.

Capable to deal with inlet consistencies between 0,4 and >10 % (pumpability required)

Flow rates per hour per dewatering module tailored to sludge volume, from 1 to 4 m³/hr.

Service 2

High capture

Available CVH model sizes from 1 dewatering channel to 8 channels per machine, modular and expandable.   Excellent filtrate quality at low Total Suspended Solids % content. Can substitute prethinckening and main dewatering euipment by one machine type. Best in class technology in terms of operational flexibility and low OPEX across the machine life-cylce.

Enhancing Solid-Liquid Separation Efficiency

A Flexible, Efficient and Expanable Dewatering Solution.

Traditional dewatering equipment may fall short of today's efficiency needs. The Rotary Press stands out with its superior solid-liquid separation capabilities, minimizing water content in the sludge and elevating the overall process efficiency to meet and exceed industry standards.

The Rotary Press features a compact design that occupies minimal space. It operates at a low rotational speed, which significantly diminishes noise and vibrations. This not only eases installation and site requirements but also enhances the working environment.

Additionally, its fully enclosed design effectively contains and reduces unwanted odors, ensuring a more pleasant operational setting.

Furthermore, the Fournier Rotary Press is engineered for minimal operator intervention, thanks to its high automation and reliability.


This feature, coupled with the availability of lab sludge testing and pilot-scale trials, provides confidence in both the equipment’s day-to-day reliability and its long-term operational benefits.

Pilot testing underscores the benefits of the Fournier Rotary Press

Performance Data from Pilot Testing

Lange Lyche Teknisk A/S offers both bench scale and full scale pilot testing with mobile containerized test-units that enables  comprehensive industrial-scale test result with customers unique sludge and production process. Performance data is supported by lab sludge testing and full-scale tests using out pilot test units.
Fish Farming Sludge

Prethickened sludge from fish farming.

Polymer usage: 5 kg/active/dry ton
Energy consumption: 2,8 kWhr/dry ton
Inlet TS% 6,5 %
Cake TS% > 29,4%
Estimated Production  65 kg/hr/channel
Capture-Rate TSS%: 95,5 %


Fish Farming Sludge

Prethickened sludge from fish farming.

Polymer usage: 6 kg/active/dry ton
Energy consumption: 2,8 kWhr/dry ton
Inlet TS% 6,1 %
Cake TS% > 26,7%
Estimated Production  80 kg/hr/channel
Capture-Rate TSS%: 98,5 %


Fish Farming Sludge

Prethickened sludge from fish farming.

Polymer usage: 6,7 kg/active/dry ton
Energy consumption: 2,8 kWhr/dry ton
Inlet TS% 5,4 %
Cake TS% > 23,8%
Estimated Production  95 kg/hr/channel
Capture-Rate TSS%: 97,9 %


Lange Lyche Teknisk - your dewatering supplier.


Lange Lyche Teknisk AS main product is the Fournier Rotary Press dewatering machine.  Along with our partners  we can offer a range of complementary equipment that help optimizing the complete sludge process - before and after the dewatering stage.

Our combined team of experts possesses extensive process know-how and resources, and are able to provide complete, tailor-made, turn-key solutions ranging from agitators to pumps. All accompanied by comissioning, exceptional life-cycle support and services.


The FOURNIER ROTARY PRESS™ offers a highly efficient solid-liquid dewatering separation for a range of industries that handles biomass, sludge, pulp, or other suspension materials.

PG Submix agitators are meticulously engineered to prevent sedimentation and ensure optimal mixing and blending of the pulp, resulting in improved uniformity and quality of the final products.

Wide selection of quality pumps and flow solutions for all stages of the process-line.

The Fournier QuickDraw - an innovative continuous flow dry polymer preparation system that offers all the advantages of dry polymer, without its cumbersome downsides.

Connect with our team

Want to know more about the FOURNIER ROTARY PRESS™ and how this technology can help reducing your operational expenses?  Get in touch with our team for an insightful talk about dewatering and how to optimize your process-loop.
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