With the rapid development of the global food processing industry, wastewater treatment has become a critical challenge for overseas food plants. Wastewater generated from food production typically contains high levels of organic matter, oil, grease, and suspended solids. Efficient sludge dewatering is essential to reduce disposal costs, improve environmental compliance, and enhance overall plant efficiency.

The GN Dewatering Screw Press offers a reliable and economical solution for sludge treatment in food plant wastewater systems.

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What is GN Screw Press Sludge Dewatering Machine?

GN screw press sludge dewatering machine is a kind of economic and environmentally friendly sludge dewatering equipment. It is a new type of sludge extrusion dewatering equipment that operates based on the principle of screw extrusion.

Through:

• The change of screw diameter and screw pitch

• The strong squeezing force generated during rotation

• The tiny gap between floating rings and fixed rings

the machine effectively achieves solid-liquid separation.

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System Composition and Working Process

The GN dewatering screw press system mainly consists of:

• Fully automatic control cabinet

• Flocculation conditioning tank

• Sludge thickening and dewatering unit

• Filtrate collecting tank

With advanced automation technology, the system can:

• Perform automatic flocculation dosing

• Continuously complete sludge thickening and dewatering

• Automatically discharge or recycle filtrate

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Working Principle

The core of the screw press is a filtration structure composed of fixed rings and moving rings, with a screw shaft running through the center.

Key process stages:

1. Sludge Concentration Zone

   • Sludge is first thickened by gravity.

   • Initial water separation occurs.

2. Dewatering Zone

   • Screw pitch gradually decreases.

   • Internal pressure increases due to back pressure plate.

   • Water is squeezed out through narrow ring gaps.

3. Self-cleaning Mechanism

   • The rotation of the screw shaft drives moving rings.

   • Prevents clogging by continuously cleaning filter gaps.

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Technical Capability

The GN screw press is suitable for sludge concentrations ranging from:

? 2000 mg/L to 50,000 mg/L

Representative Models & Capacity (Absolute Dry Sludge)

• GNDL131: 4–14 kg/h

• GNDL202: 16–40 kg/h

• GNDL302: 40–140 kg/h

• GNDL403: 200–480 kg/h

• GNDL404: up to 640 kg/h

It can handle varying sludge concentrations with flexible processing capacities, making it ideal for different food wastewater scenarios.

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Advantages for Food Plant Wastewater Treatment

1. Wide Application Range

Suitable for:

• Food processing wastewater

• Oil and grease sludge

• Starch and beverage industries

2. Continuous and Automatic Operation

• 24/7 operation capability

• Minimal manual intervention

3. Anti-Clogging Design

• Moving ring structure ensures self-cleaning

• Ideal for oily and sticky sludge common in food plants

4. Low Investment & Operating Cost

• Low energy consumption

• Reduced chemical usage

• No secondary pollution

5. Compact and Energy Efficient

• Small footprint

• Easy installation in existing plants

6. Environmentally Friendly

• Operates under aerobic conditions

• Helps prevent phosphorus release

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Application in Overseas Food Plants

For overseas food processing facilities, especially in regions with strict environmental regulations, the GN screw press provides:

• Stable sludge dewatering performance

• Reduced sludge volume and disposal cost

• Compliance with discharge standards

• Easy integration with existing wastewater systems

It is widely used in industries such as:

• Municipal wastewater

• Aquaculture

• Food & beverage

• Pharmaceutical

• Chemical processing

• Paper and leather industries

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Conclusion

The GN Dewatering Screw Press is a proven, cost-effective solution for sludge management in food plant wastewater treatment. With its advanced screw extrusion design, automatic operation, and strong anti-clogging capability, it is particularly suitable for handling high-organic and oily sludge commonly found in food processing plants.

For companies seeking reliable and environmentally responsible wastewater treatment solutions, GN screw press is an excellent choice.

GN Separation is pleased to announce that it will participate in the Asiawater 2026, one of the most influential water and wastewater industry exhibitions in Southeast Asia.

The exhibition will take place from April 7 to April 9, 2026, at the Kuala Lumpur Convention Centre.

GN Separation warmly welcomes visitors, partners, and industry professionals to meet our team and learn more about our solid-liquid separation solutions.

Exhibition Details

• Event: Asiawater 2026

• Date: 7–9 April 2026

• Location: Kuala Lumpur Convention Centre

• GN Booth: Hall 6, Booth B602

At the exhibition, GN Separation will introduce its decanter centrifuge technology and separation solutions widely used in wastewater treatment, industrial sludge dewatering, and other environmental protection applications.

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GN Decanter Centrifuge for Industrial Solid-Liquid Separation

The full name of the decanter centrifuge is the horizontal screw decanter centrifuge, which is a widely used piece of equipment in the field of industrial solid-liquid separation.

According to the characteristics of materials in different industries, GN decanter centrifuges can be divided into three main types:

• Dewatering decanter centrifuge

• Separation decanter centrifuge

• Clarifying decanter centrifuge

With the integration of centripetal pump technology, GN decanter centrifuges can also achieve three-phase separation of liquid–liquid–solid, making them suitable for more complex industrial processes.

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GN Decanter Centrifuge Types and Applications

T Series – Dewatering Type

• Beach Angle: 8.5°

• Typical Application: Solid dewatering

The T series dewatering decanter centrifuge is mainly used to remove liquid from solid materials. It is suitable for materials with:

• Large particle size

• High density difference between solid and liquid

• Low viscosity

• High concentration

• High processing capacity

This type is widely used for sludge and wastewater treatment. When fine particles are present, flocculants are typically added to form larger aggregates before dewatering with the centrifuge.

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Y Series – Separation Type

• Beach Angle: 15°

• Typical Application: Balanced separation performance

The Y series separation decanter centrifuge combines the advantages of both the T series dewatering type and the C series clarifying type.

It is designed to achieve both:

• Good liquid clarity

• Relatively dry solid discharge

This series is particularly suitable for fine and soft materials that are difficult to separate, especially when materials have:

• Small particle size

• Small density difference between solid and liquid

• High viscosity

• Low solid concentration

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C Series – Clarifying Type

• Beach Angle: 20°

• Typical Application: High liquid clarity

The C series clarifying decanter centrifuge is designed for processes where high clarity of the liquid phase is the primary goal.

It is commonly used for materials that:

• Have very fine particles

• Have small density differences between phases

• Require high-quality clarified liquid

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LWS Series – 3-Phase Decanter Centrifuge

• Application: Solid–liquid–liquid separation

The LWS series 3-phase horizontal decanter centrifuge is designed for processes that require simultaneous separation of solids and two immiscible liquid phases.

Typical requirements include:

• Solid phase heavier than the liquid phase

• Two liquid phases with different densities

• Liquids that do not mix with each other

This design is widely used in industries such as oil processing, waste oil treatment, and food processing.

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GN Manufacturing Quality and Technology

As a professional manufacturer of decanter centrifuges, GN Separation places strong emphasis on product reliability and long-term operational value for users.

Key manufacturing features include:

• High-quality stainless steel materials produced through centrifugal casting or forging

• Hard alloy protection applied to wear parts to improve durability

• Advanced CNC machining equipment, including CNC lathes, CNC machining centers, and gantry milling machines to ensure high machining precision

• High-speed dynamic balancing, allowing the screw and bowl to be balanced at actual operating speeds

These processes help ensure stable operation, reduced vibration, and longer service life of GN centrifuges.

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Global Applications

GN decanter centrifuges are widely used in industries such as:

• Wastewater treatment

• Oil and gas drilling waste management

• Mining and mineral processing

• Food and rendering industry

• Chemical processing

Today, GN products have been exported to more than 60 countries and regions worldwide, gaining strong recognition from customers for their performance and reliability.

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Meet GN Separation at Asiawater 2026

GN Separation welcomes industry professionals visiting Asiawater 2026 to stop by our booth.

? Hall 6, Booth B602

Our team will be pleased to discuss solid-liquid separation solutions, decanter centrifuge applications, and potential cooperation opportunities.

We look forward to meeting you in Kuala Lumpur.

Relying on strong local partnerships, GN Separation (GN Solids) has successfully completed the installation and commissioning of a sludge dewatering decanter centrifuge at a municipal wastewater treatment plant in France. The equipment is now operating smoothly, with performance fully meeting design expectations, and has received high recognition from the end user.

Strong Local Partnership Ensures Project Success

GN’s local partner in France played a key role in this project. With proven capabilities in equipment installation, commissioning, and maintenance support, the partner ensured that the GN decanter centrifuge was installed efficiently and brought into stable operation within a short timeframe.

This collaboration not only guaranteed the success of the French project, but also provides a solid foundation for GN decanter centrifuges operating across France and the wider European market, ensuring long-term operational reliability and responsive technical support.

GN T Series Dewatering Decanter Centrifuge

The installed equipment is a GN T Series Dewatering Decanter Centrifuge, specifically designed for sludge dewatering and thickening applications. The T Series features a beach angle of 8.5 degrees, which creates a longer drying zone in the conical section of the bowl. This design significantly improves dewatering efficiency and enables the discharge of drier solids, particularly in municipal and industrial wastewater treatment processes.

The GN T Series decanter centrifuge is widely used for maximum dewatering requirements, especially for materials with:

• Large particle size

• High solid–liquid density difference

• Low viscosity

• High solid concentration

• High treatment capacity requirements

For sludge or wastewater containing fine particles, flocculants are typically added to aggregate fine solids into larger flocs, which are then effectively dewatered by the T Series decanter centrifuge.

Typical Applications

GN dewatering decanter centrifuges are suitable for a wide range of materials, including but not limited to:

• Municipal sewage and sludge

• Environmental protection wastewater

• Industrial wastewater (chemical, printing & dyeing, steel-making, precision casting, etc.)

• Construction mud, tunnel mud, and mine wastewater

• Oily sludge, oil sand separation, oil sludge, coal tar

• Drilling mud and sand washing water

• River sludge, lake sludge, and water plant sludge

• Mineral processing slurries such as kaolin, calcium carbonate, bentonite, silica, titanium dioxide, calcium sulfate, and barium sulfate

• Aquaculture wastewater and organic wastewater

Key Technical Features of GN T Series Decanter Centrifuge

• 8.5° beach angle design: Extends the drying zone and improves solid dryness.

• Duplex stainless steel bowl and end caps (SUS2205 or SUS2304): Manufactured by centrifugal casting for superior strength, corrosion resistance, and stress control compared to traditional welded structures.

• CNC-formed screw blades: Higher conveying efficiency than traditional drawn screw designs.

• Optimized screw pitch and beach structure: Separates sedimentation and dewatering zones for higher capacity, clearer centrate, and lower energy consumption.

• Tungsten carbide wear sleeves at solid discharge ports: Extremely high wear resistance and long service life.

• Flexible weir plate adjustment: Allows easy control of liquid pool depth to balance dryness and clarity under different operating conditions.

• Advanced bearing and lubrication systems: SKF premium bearings with optional semi-automatic or fully automatic lubrication systems.

• Comprehensive monitoring and protection system: Real-time monitoring of speed, vibration, temperature, torque, and motor current, with automatic protection against overload, blockage, or abnormal operation.

• Compact dual-motor arrangement: Saves space and improves maintenance accessibility.

• Explosion-proof control options available: Including ATEX, IECEx, and other international certifications.

Complete Dewatering Solutions from GN

Beyond supplying individual decanter centrifuges, GN Separation provides complete turnkey solutions for sludge and slurry dewatering processes. Leveraging GN’s extensive product portfolio in separation, conveying, and classification equipment, GN can deliver integrated systems covering:

• Material transportation

• Classification and screening

• Thickening and dewatering

Looking Forward

The successful commissioning of this project in France further demonstrates GN’s technical strength, product reliability, and international service capability. With experienced local partners and proven equipment performance, GN Separation continues to expand its footprint in Europe, delivering efficient and reliable solid–liquid separation solutions to municipal and industrial customers worldwide.

Ports handling iron ore face constant challenges: large throughput, abrasive materials, high moisture content, and the need for stable, continuous operation. To meet these requirements, one batch of GN mining vibrating screens has recently been supplied for iron ore separation and dewatering applications at a port facility, improving both efficiency and reliability compared with traditional screening solutions.

Project Overview

This project adopts a combination of high-frequency fine screening and large linear dewatering screening, designed to replace conventional rotary drum screens and enhance overall process performance:

• High Frequency Fine Vibrating Screen GNFG1232
  Used for slag separation, replacing traditional rotary drum screens.
  Equipped with an undersize collection chute for clean and efficient material handling.

• Large Linear Vibrating Screen GNLSZ3061
  Used for dewatering of screened iron ore materials, ensuring lower moisture content and improved downstream transport and storage.

This configuration is particularly suitable for port operations, where space, uptime, and processing efficiency are critical.

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High Frequency Fine Vibrating Screen GNFG1232

The GNFG1232 high-frequency fine vibrating screen is designed for precise separation of fine particles. Compared with rotary drum screens, it offers:

• Higher screening efficiency for fine materials

• Compact structure and lower maintenance requirements

• Better adaptability to wet and sticky iron ore conditions

By integrating an undersize collection chute, the GNFG1232 allows smooth discharge of fine materials into the next process step, reducing spillage and simplifying site layout.

Large Linear Vibrating Screen GNLSZ3061 for Dewatering

The GNLSZ3061 large linear vibrating screen plays a key role in the dewatering stage. GN large linear vibrating screens are mainly composed of:

• Box-type vibration exciter

• Screen box

• Vibration damping springs

• Support structure

• Driving device

The vibration trajectory is linear, and the screen can be installed horizontally or at a slight inclination, depending on site conditions and process requirements.

These screens are widely used in:

• Wet classification

• Dewatering

• Demineralization

• Tailings dry discharge

across industries such as mineral processing, coal preparation, aggregates, building materials, and chemical processing.

Screen structures are available in single-deck or double-deck designs, and models can be customized according to customer requirements.

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Technical Parameters (Reference)

Large Linear Vibrating Screen – Single Deck

• Screen area: up to 31.39 m²

• Vibration frequency: 14–16 Hz

• Double amplitude: 7–10 mm

• Mesh size range: 0.2–25 mm

• Capacity: up to 900 t/h (depending on model and conditions)

Large Linear Vibrating Screen – Double Deck

• Screen area: up to 31.39 m² × 2

• Capacity: up to 950 t/h (depending on model and conditions)

Note: The above parameters are for reference only and can be adjusted according to actual operating conditions. Final technical agreements and quotations shall prevail.

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Features and Advantages of GN Large Linear Vibrating Screens

GN large linear vibrating screens are designed for heavy-duty mining and port environments, offering the following advantages:

• Non-welded side plates made from high-strength alloy steel, assembled with imported Huck rivets, eliminating welding residual stress

• Finite element analysis (FEA) to optimize structure and vibration parameters, avoiding resonance and extending service life

• Rectangular tube cross-beam design with lightweight, high-strength exciter beam structure

• Post-weld heat treatment on main components to effectively relieve internal stress

• Polyurea spray coating on beams for superior corrosion and wear resistance; optional rubber protection for high-impact areas

• High-efficiency helical gearbox-type exciters with large excitation force, low noise, stable operation, and long service life

• Adjustable amplitude by changing eccentric block counterweights

• Modular polyurethane screen panels, offering easy replacement and strong versatility across different applications

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Working Principle

GN large linear vibrating screens are equipped with two gearbox vibrators operating under the principle of forced synchronization. Under excitation:

1. The screen body performs linear reciprocating motion.

2. Vibratory force is transmitted to the material layer, throwing the material upward for stratification and separation.

3. Material is continuously fed onto the screen surface, classified according to particle size.

4. Oversize and undersize materials are discharged separately into corresponding launders and sent to the next process stage.

The angle between the excitation force direction and the horizontal plane can be designed based on material characteristics. This angle directly affects material travel speed and overall processing capacity.

GN Separation is pleased to announce that four mini decanter centrifuges have been shipped to Europe for solid-liquid separation in mineral exploration mud applications. These decanter centrifuges will play a key role in efficiently separating solids from drilling mud, helping exploration companies improve fluid recovery and reduce environmental impact.

Decanter Centrifuge Overview

The full name of the decanter centrifuge is the decanter centrifuge, a widely used piece of equipment in industrial solid-liquid separation. Depending on material characteristics in different industries, GN decanter centrifuges are available in dewatering, separation, and clarifying types.

With advanced centripetal pump technology, GN decanter centrifuges can also perform three-phase separation of solids and two immiscible liquids, providing flexible solutions for various applications.

GN Decanter Centrifuge Series

GN Decanter Centrifuge Features

As a leading manufacturer, GN Separation emphasizes product quality and long-term user benefits:

• Material Selection: High-quality centrifugal cast or forged stainless steel is used for the bowl and screw. Wear parts are protected with hard alloy.

• Precision Machining: CNC lathes, CNC centers, and CNC gantry milling machines ensure accurate machining of all centrifuge components.

• Dynamic Balance: In addition to low- and medium-speed balancing, GN applies high-speed dynamic balancing at actual operating speeds for optimal performance.

• Global Reach: GN decanter centrifuges are exported to over 60 countries and regions and receive high praise from customers worldwide.

With these four mini decanter centrifuges now in Europe, GN continues to support the exploration industry with reliable, efficient, and durable solid-liquid separation solutions.