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Efficient Solid-Liquid separation of biomass

The Fournier Rotary Press™ excels in reducing the volume of all kinds of sludge and  biomass - offering excellent dewatering  solutions that can help reducing transportation costs significantlly.

Enhancing Biogas Production with the Fournier Rotary Press

In the face of stringent European environmental regulations and the pressing challenges of climate change, the biogas sector is experiencing significant growth, fueled by advancements in waste management and renewable energy utilization. Central to this development is the effective processing of organic residuals, which are not only a source of energy but also yield valuable byproducts like compost and fertilizers rich in nitrogen and phosphorus.

The Fournier Rotary Press™ stands out as a pivotal technology in the biogas production chain, particularly during the critical solid-liquid separation phase following digestion. Its design caters to a broad spectrum of input materials—from household waste and agricultural residues to industrial sludges—ensuring versatility across different plant configurations. With models ranging from one to eight dewatering channels, the Rotary Press offers scalable solutions that adapt to varying operational demands.

Greve Biogas Factory - Norway

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.


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.

Fournier Rotary Press™ - efficient and cost saving

Rotary Press Solid-Liquid Separation Increases Efficiency at Lower Cost.

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.

An increased percentage of Total Solids helps reducing transportation cost by significant amounts, as the lower liquid content reduces total weight subtaincially.

Key to the success of any biogas plant is minimizing operational costs while maximizing efficiency. The Fournier Rotary Press™ technology excels here by offering low energy consumption (ranging from 3 to 7 kW/hr per dry ton of sludge) and reduced freshwater usage—critical in today’s eco-conscious market. Its slow-rotating technology not only ensures high cake dry solids percentages but also achieves superior filtrate quality with low total suspended solids (TSS) percentages, which is essential for subsequent ammonia stripping processes.

To avoid settling in the sludge storage tankt - agitation of the mass is a necessity. The range of PG-Submix agtitators offer safe and realiable solutions for this.

How does the Fournier Rotary Press perform?

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 0.5 and 2 rpm,  produce high cake TS%. Capable to deal with inlet consistencies between 0,5 and >10 % (pumpability required)  The low speed reduces noise and virberations, minimizing wear and extending service life.  

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 0,5 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.   Operational window spans a wide range of input sources and digestate qualities. Best in class technology in terms of operational flexibility and low OPEX across the machine life-cylce. Typical life-cycle 20+ years.

How does the Fournier Rotary Press™ help reduce OPEX?

A Flexible, Efficient and Expanable Dewatering Solution.

Operational flexibility is another hallmark of the Rotary Press. It accommodates a wide range of input consistencies (0.5% to >10%), which is crucial for handling diverse types of digestate.

Whether operating with or without polymers, the system maintains high performance, with capture rates of filtrate TSS reaching up to 97%. For plants prioritizing environmental impact, the press’s capability to operate with biodegradable polymers and its high-temperature resilience (up to 80 degrees Celsius) make it a preferred choice.

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. The machine’s design also considers the acoustic and environmental comfort of the facility, maintaining low noise levels and preventing odor emissions.

Fournier Rotary Press™ installations

Our Customers

Big public entities like the City of Quebec, Montreal or Varenne in Canada have been using the Rotary Press technology for years, often installing multiple lines to deal with the high sludge streams. In Europe several installations in Scandinavia can be be visited, like Glör Mjösanlegget in Lillehamer, Norway or Greve and Lindum in the Oslo area. Several new biogas projects including the Rotary Press technology are in advanced stages of plants design in Scandinavia, with  increasing interest from South European countries.

Performance data underscores the benefits of the Fournier Rotary Press

Performance Data

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.


Household Food Waste and Fish Slurry

Digested sludge from a mix of household & food production waste plus a small fraction of fish slurry.

Polymer usage: 5-7 kg/active/dry ton
Energy consumption: 7 kWhr/dry ton
Inlet TS% 4,5 %
Cake TS% > 25-35%
Estimated Production  95 kg/hr/channel
Capture-Rate TSS%: 95,5 %


Digested sludge and food production

Digested sludge from a mix from Wastewater treatment and food production.

Polymer usage: 7 kg/active/dry ton
Energy consumption: 2,7-3,5 kWhr/dry ton
Inlet TS% 7,9 %
Cake TS% > 30%
Estimated Production  100 kg/hr/channel
Capture-Rate TSS%: 98,5 %


Wastewater and food production fat

Digested & pasturized sludge from municipal wastewater treatment and fat from food production.

Polymer usage: 4-5kg/active/dry ton
Energy consumption: 3-4 kWhr/dry ton
Inlet TS% 6-6,5 %
Cake TS% > 32-37%
Estimated Production  180 kg/hr/channel
Capture-Rate TSS%: 96 %


Lange Lyche Teknisk - a complete system supplier.


As a complete system supplier with machine builder expertise, process know-how and support, Lange Lyche Teknisk along with our partners 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,  to suit your specific requirements - all accompanied by 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.