Author: gnadmin

Big Bowl Decanter Centrifuge for Overseas Paper Mill Wastewater Treatment

As environmental regulations continue to tighten worldwide, paper mills are facing increasing pressure to improve wastewater treatment efficiency, reduce sludge disposal costs, and achieve more sustainable operations. Wastewater generated during paper production often contains suspended solids, fibers, fillers, coating materials, inks, and organic contaminants, making sludge treatment a critical part of the overall process.

To meet these challenges, GN Separation provides the GNLW554-VFD T Series Dewatering Decanter Centrifuge, a reliable and high-capacity solution designed for industrial sludge dewatering applications, including overseas paper mill wastewater treatment projects.

Why Paper Mills Need Efficient Sludge Dewatering

Paper manufacturing consumes significant amounts of water during pulping, washing, bleaching, coating, and recycling processes. As a result, wastewater treatment systems in paper mills generate large volumes of sludge with high moisture content.

Without effective dewatering equipment, paper mills may encounter:

  • High sludge transportation and disposal costs
  • Difficulties in wastewater recycling
  • Increased environmental compliance pressure
  • Excessive energy consumption
  • Unstable downstream treatment performance

A properly selected decanter centrifuge can significantly reduce sludge volume, improve solid dryness, and lower operating costs.

GN GNLW554-VFD T Series Decanter Centrifuge

The GNLW554-VFD belongs to GN’s T Series dewatering decanter centrifuge range. It is specially designed for sludge thickening and dewatering applications requiring high throughput and reliable continuous operation.

The T Series adopts an optimized 8.5-degree beach angle, which extends the drying zone inside the bowl and improves solids dewatering performance. This design enables the centrifuge to discharge drier solids while maintaining stable liquid clarity.

Main Technical Specifications

Item Specification
Model GNLW554GT-VFD
Bowl Diameter 550 mm (22 Inch)
Bowl Length 2310 mm (91 Inch)
Max Speed 3112 RPM
Max G Force 3000 G
Bowl L/D Ratio 4.2
Main Motor 55/90 KW
Back Drive Motor 15/37/45 KW
Beach Angle 8.5°

The large bowl diameter and long bowl design provide strong processing capacity, making the centrifuge suitable for medium and large paper mill wastewater treatment systems.

Advantages for Paper Mill Wastewater Treatment

Excellent Sludge Dewatering Performance

Paper mill sludge often contains fine fibers and lightweight suspended solids. GN’s T Series decanter centrifuge is designed with a long dewatering zone and optimized screw conveyor structure, allowing efficient separation after polymer dosing.

The result is:

  • Reduced sludge moisture content
  • Lower sludge disposal volume
  • Improved downstream handling efficiency

Stable Continuous Operation

Paper mills typically operate continuously for long production cycles. The GNLW554-VFD is designed for stable 24/7 industrial operation with:

  • Premium SKF bearings
  • Real-time vibration monitoring
  • Bearing temperature monitoring
  • Automatic protection systems
  • High-speed dynamic balancing

These features help reduce downtime and improve operational reliability.

Corrosion-Resistant Construction

Wastewater in paper mills may contain chemicals, alkalis, chlorides, and abrasive particles. GN uses duplex stainless steel materials such as SUS2205 or SUS2304 for critical rotating components, providing excellent corrosion resistance and long service life.

Compared with conventional welded structures, GN’s centrifugal casting and forging manufacturing process offers:

  • Better structural integrity
  • Reduced residual stress
  • Improved resistance to intergranular corrosion

Energy-Efficient Design

The deep liquid pool and optimized bowl structure reduce energy loss during operation. Combined with VFD control, operators can adjust differential speed and bowl speed according to changing sludge conditions, helping reduce power consumption while maintaining separation performance.

Wear Protection for Long Service Life

Industrial sludge applications can cause severe wear on centrifuge internal components. GN equips the centrifuge with:

  • Tungsten carbide discharge sleeves
  • Replaceable wear-resistant alloy protection plates
  • Durable screw conveyor protection

These designs greatly improve equipment longevity and reduce maintenance costs.

Intelligent Control System

The GNLW554-VFD usually adopts a stainless steel electrical control panel integrated with:

  • VFD
  • PLC
  • HMI touchscreen
  • Alarm and monitoring system

Key operating parameters are monitored in real time, including:

  • Bowl speed
  • Differential speed
  • Bearing temperature
  • Vibration
  • Motor current
  • Torque
  • Lubrication status

If abnormal conditions occur, the system can automatically trigger alarms or protection procedures to ensure operational safety.

Suitable Applications Beyond Paper Mills

Although widely used in paper mill wastewater treatment, the GN T Series decanter centrifuge is also suitable for many industrial and environmental applications, including:

  • Municipal sludge dewatering
  • Sand washing wastewater
  • Mining wastewater
  • Oily sludge treatment
  • Chemical wastewater
  • Printing and dyeing wastewater
  • River and lake sludge treatment
  • Kaolin and calcium carbonate processing

Complete Turnkey Dewatering Solutions

In addition to decanter centrifuges, GN Separation can also provide complete sludge dewatering systems, including:

  • Polymer dosing units
  • Sludge feeding pumps
  • Screw conveyors
  • Vibrating screens
  • Control systems
  • Skid-mounted integrated solutions

GN’s extensive manufacturing capability allows customers to obtain complete turnkey solutions from a single supplier.

Conclusion

For overseas paper mills seeking reliable and efficient sludge dewatering equipment, the GN GNLW554-VFD T Series Dewatering Decanter Centrifuge offers a practical and high-performance solution.

With its large bowl design, optimized beach angle, intelligent control system, and durable wear-resistant construction, the centrifuge helps paper mills:

  • Reduce sludge disposal costs
  • Improve wastewater treatment efficiency
  • Enhance operational stability
  • Meet increasingly strict environmental requirements

GN Separation continues to support global industrial customers with dependable separation equipment and customized wastewater treatment solutions. GN Separation looks forward to working with you.

GN Supplied Four Mini Decanter Centrifuges for European Mining Exploration Project

In geological and mineral exploration, diamond/core drilling is widely used due to its accuracy in obtaining subsurface samples. During drilling, clean water or bentonite-based drilling fluid is typically applied to cool the drill bit and carry cuttings to the surface.

However, with increasingly strict environmental regulations, the traditional method of mud pit settling is no longer sufficient. It leads to land contamination, inefficient solids removal, and significant fluid loss.

To address these challenges, GN has developed a closed-loop geological drilling mud treatment system, designed to minimize environmental impact while improving drilling efficiency.

Closed-Loop Mud Treatment System – Overview

GN’s system is engineered specifically for geological coring drilling mud, enabling efficient solid-liquid separation and reuse of drilling fluid.

Main Components

The system typically includes:

  • Small shale shaker
  • High-speed decanter centrifuge
  • Mud supply pump
  • Jet mixing hopper
  • Mud tank

👉 This integrated design allows:

  • Continuous removal of drilled solids
  • Recycling of drilling fluid
  • On-site preparation and mixing of new mud

System Models

GN offers two standard configurations:

  • Standard Type: GNSR-130L
  • Modular Type: GNSR-130M

Both are designed for mobility, compact footprint, and rapid deployment in exploration sites.

Core Equipment – Mini Decanter Centrifuge

At the heart of the system is the 220mm bowl mini decanter centrifuge, optimized for fine solids separation in low-flow drilling operations.

Available Models

Model GNLW223D GNLW223D-FHD GNLW224G-VFD
Type Fixed Speed Hydraulic Drive VFD Drive
Max Capacity 130 L/min 130 L/min 130 L/min
Typical Capacity 100 L/min 100 L/min 100 L/min
Bowl Diameter 220 mm 220 mm 220 mm
Bowl Length 670 mm 670 mm 924 mm
Max Speed 4500 RPM 4000 RPM 5000 RPM
Typical Speed 3800 RPM 0–3800 RPM 0–4500 RPM
Max G-Force 2492 2000 3000
Typical G-Force 1777 1777 2500
Main Motor 11 kW Hydraulic Drive 11 kW
Back Motor N/A N/A 5.5 kW

Key Advantages of GN Solution

1. Environmental Compliance

The closed-loop system eliminates the need for open mud pits, reducing:

  • Soil contamination
  • Waste discharge
  • Environmental footprint

2. Efficient Solid-Liquid Separation

With high-speed centrifuges generating up to 3000 G-force, the system can:

  • Remove fine solids effectively
  • Improve drilling fluid quality
  • Extend fluid reuse cycles

3. Flexible Drive Options

GN provides three drive configurations to suit different project needs:

  • Fixed Speed (GNLW223D): Simple and cost-effective
  • Hydraulic Drive (GNLW223D-FHD): Ideal for harsh environments and variable loads
  • VFD Drive (GNLW224G-VFD): Precise control and energy efficiency

4. Compact & Modular Design

  • Small footprint for remote exploration sites
  • Skid-mounted or modular options
  • Easy transportation and quick installation

5. Integrated Mud Mixing Capability

The system includes:

  • Mud mixing pump
  • Jet hopper

👉 Allowing operators to:

  • Prepare new drilling fluid
  • Adjust mud properties in real time

Application Scenarios

This system is ideal for:

  • Mineral exploration drilling
  • Geological coring projects
  • Remote or environmentally sensitive areas
  • Projects requiring fluid recycling and minimal waste discharge

Conclusion

With stricter environmental regulations and increasing demand for efficient drilling operations, traditional mud treatment methods are no longer viable.

GN Solids Control provides a compact, efficient, and environmentally responsible solution through its geological drilling mud treatment system. By integrating high-speed centrifuges and modular design, GN helps clients achieve:

  • Reduced environmental impact
  • Improved drilling efficiency
  • Lower operational costs

GN Sludge Dewatering Centrifuge Package Shipped to Overseas Environmental Company

GN Separation recently completed the manufacturing and shipment of a sludge dewatering centrifuge package to an overseas environmental protection company. This project demonstrates GN’s capability to deliver reliable and efficient sludge treatment solutions for international wastewater treatment applications.

The package is designed to support the client’s requirements for municipal and industrial sludge dewatering, ensuring stable performance, reduced sludge volume, and compliance with environmental standards.

 

Overview of GN Dewatering Decanter Centrifuge (T Series)

The core equipment in this project is the GN Dewatering Decanter Centrifuge (T Series).

GN dewatering decanter centrifuge is a T series decanter centrifuge with a beach angle of 8.5 degrees, specifically designed for sludge dewatering and thickening applications.

Thanks to its optimized structural design, the T series centrifuge is widely used in:

  • Municipal wastewater treatment

  • Industrial wastewater treatment

  • Environmental protection projects

Working Principle and Application

The GN T series decanter centrifuge is ideal for materials with:

  • Large particle size

  • High density difference between solid and liquid

  • Low viscosity

  • High concentration

For sludge containing fine particles, flocculants are typically added to aggregate fine solids into larger particles before entering the centrifuge. This significantly improves separation efficiency and dewatering performance.

Typical Applications

GN dewatering decanter centrifuge is suitable for a wide range of industries and materials, including:

  • Municipal sewage and river sludge

  • Food and organic wastewater

  • Oily sludge and oil sand separation

  • Drilling mud and construction slurry

  • Mining and mineral processing wastewater

  • Chemical and pharmaceutical wastewater

  • Printing and dyeing wastewater

  • Aquaculture wastewater

It is also widely used for solid-liquid separation of materials such as:

  • Calcium carbonate, bentonite, silica

  • Titanium dioxide, barium sulfate

  • Kaolin, aluminum hydroxide

  • Various industrial slurries and fine particles

Key Technical Features

1. Optimized 8.5° Beach Angle

The 8.5-degree beach angle extends the dewatering zone, allowing:

  • Longer drying time

  • Higher solid dryness

  • Improved dewatering efficiency

2. High-Quality Materials and Manufacturing

  • Bowl and shaft caps made of duplex stainless steel (SUS2205 / SUS2304)

  • Manufactured by centrifugal casting and forging, ensuring:

    • Higher strength

    • Better corrosion resistance

    • Longer service life

3. Advanced Screw Design

  • CNC-formed screw blades for improved conveying efficiency

  • Optional variable pitch design for enhanced compression

  • Replaceable wear-resistant alloy protection plates

4. Energy-Efficient and Stable Operation

  • Deep liquid pool design reduces energy loss

  • Optimized flow structure minimizes turbulence

  • Three-stage dynamic balancing ensures smooth high-speed operation

5. Wear Protection and Durability

  • Tungsten carbide sleeves at solid discharge ports

  • Anti-abrasion design for extended equipment lifespan

  • Suitable for abrasive and high-solid-content materials

6. Intelligent Control System

  • Equipped with PLC, HMI, and VFD

  • Real-time monitoring of:

    • Speed

    • Temperature

    • Vibration

    • Torque

    • Motor current

  • Automatic protection for:

    • Overload

    • Blockage

    • Abnormal operation

7. Flexible and User-Friendly Design

  • Adjustable weir plates for liquid pool depth control

  • Easy maintenance with hydraulic bearing disassembly

  • Compact structure with dual motors on one end

Model Range and Capacity

GN T Series decanter centrifuge is available in multiple models, including:

  • GNLW224GT

  • GNLW364GT

  • GNLW454GT

  • GNLW554GT

  • GNLW654GT

  • GNLW764GT

With:

  • Bowl diameters from 220 mm to 760 mm

  • Maximum G-force up to 3200 G

  • Processing capacity tailored to different sludge conditions

Project Value for Overseas Clients

For overseas environmental companies, GN centrifuge packages offer:

  • Reliable and continuous sludge dewatering

  • Reduced sludge disposal costs

  • Compliance with environmental regulations

  • Easy integration into existing treatment systems

  • Lower operation and maintenance cost

Conclusion

The successful shipment of this sludge dewatering centrifuge package highlights GN Separation’s strong capability in delivering high-performance and customized sludge treatment solutions to global clients.

The GN T Series dewatering decanter centrifuge, with its optimized 8.5° beach angle, robust construction, and intelligent control system, is an ideal choice for demanding sludge dewatering applications.

GN Dewatering Screw Press for Overseas Food Plant Wastewater Treatment

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.

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.

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

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.

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.

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

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

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 Will Participate in Asiawater 2026 in Kuala Lumpur

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.

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.

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.

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

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

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.

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.

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.

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.