Month: June 2025

Managing oily sludge has long been a challenge for refineries, drilling sites, and industrial plants due to its complex composition and environmental risks. GN Separation offers a comprehensive Oily Sludge Treatment System designed to address these challenges with efficiency, environmental compliance, and resource recovery in mind.

A Complete Process for Oily Sludge Hot Washing

The GN Oily Sludge Treatment System is engineered to perform the entire oily sludge hot washing process. From sludge extraction to three-phase separation, the system integrates multiple technologies to ensure thorough treatment and maximum recovery. The core steps include:

1. Sludge Extraction
   The process starts with the extraction of oily sludge from pits or tanks using GN’s solid vacuum pump or mechanical excavators.

2. Heating & Conditioning
   The extracted sludge is transferred to a heating and pre-mixing tank, where it is stirred and conditioned. This step facilitates the breakdown of sludge structure, enhancing the effectiveness of the chemical treatment.

3. Coarse Particle Screening
   A high G-force vibrating screen is used to remove large solid particles from the conditioned sludge, preparing it for finer separation stages.

4. Secondary Heating with Chemicals
   The remaining fine sludge undergoes further heating and is treated with chemical agents. This helps to strip oil from solid particles, transferring it into the liquid phase for easier separation.

5. Two-Phase Solid-Liquid Separation
   Using GN’s decanter centrifuge, the sludge is separated into solid and liquid phases. The solids, with an oil content reduced to below 2%, can be further treated by biodegradation, pyrolysis, or incineration.

6. Three-Phase Separation
   The liquid phase is sent to a three-phase disc stack separator, which separates it into recoverable oil, reusable water, and residual solids. This step ensures maximum resource recovery and minimizes waste.

Flexible Models to Meet Diverse Needs

GN offers three standard models of the oily sludge treatment system:

Each system can be customized based on the sludge characteristics and operational needs of the client. GN engineers will analyze sample material and offer tailored configurations to ensure optimal performance.

Core Equipment in the System

GN’s oily sludge treatment solution is built around several high-performance machines, including:

• Solid Vacuum Pump – Efficiently extracts and transfers sludge over long distances.

• High G Vibrating Screen – Separates coarse solids from heated sludge.

• Decanter Centrifuge – Performs high-speed solid-liquid separation with minimal residual oil.

• Three-Phase Disc Separator – Extracts oil, water, and solids with high precision and G-force.

Applications Across Industries

GN’s oily sludge treatment system is widely applied in:

• Oil refineries (e.g., tank bottom sludge)

• Drilling operations (drilling waste treatment)

• Oil tank cleaning

• Industrial oily wastewater treatment

Whether handling refinery waste or tank cleaning sludge, GN’s system delivers reliable results with a focus on environmental safety, operational efficiency, and oil recovery.

Resource Recovery & Environmental Benefits

After treatment:

• Oil is recovered and can be reused or sold.

• Water is recycled for hot washing or cleaning.

• Solid residue has significantly reduced oil content, making it suitable for environmentally safe disposal or further treatment.

GN Separation is proud to announce the successful delivery of five GNLW364-FHD Full Hydraulic Drive Decanter Centrifuges to an overseas starch processing facility. These machines are designed to handle high-viscosity, high-concentration materials such as starch slurry, while also meeting stringent food-grade requirements.

Food-Grade Design for Starch Separation

The GNLW364-FHD model features a polished interior bowl and screw, ensuring hygienic operation and full compliance with food processing standards. This makes it an ideal choice for applications involving sensitive materials like starch, where sanitation and performance are equally critical.

Equipped with Swiss-Made Viscotherm Hydraulic System

Each unit is powered by the Swiss Viscotherm hydraulic drive system, one of the world’s leading technologies in decanter centrifuge control. The system includes:

• Hydraulic differential

• Hydraulic system

• Air cooling system

The hydraulic drive system enables independent and infinitely variable control of both the bowl speed and the differential speed during operation, offering unmatched flexibility and efficiency. It is especially well-suited for high-temperature, heavy-duty environments.

GNLW364-FHD Highlights

• Model: GNLW364-FHD

• Bowl Material: Duplex SS2304/SS2205 (centrifugal casting)

• Screw Material: SS304/SS316

• Screw Protection: Tungsten Carbide Tiles

• Solids Discharge Protection: Tungsten Carbide Inserts

• Bearings: SKF

• Drive System: Full Hydraulic, Viscotherm (Switzerland)

• Electrical Control: PLC Smart Control

• Coating: Cosco & Kansai Zinc Rich Epoxy

• Max Capacity: 45 m³/h (200 GPM)

• Max Bowl Speed: 3400 RPM (2328 G)

• Max Torque: 4163 N·m

• Machine Dimensions: 3000 × 2400 × 1860 mm

• Weight: 3400 kg

Specifications above are for reference only and subject to project-specific configurations.

Commitment to International Quality Standards

At GN Separation, we work closely with world-renowned component suppliers like Viscotherm to ensure our centrifuges meet the highest global standards in both performance and reliability. This project is a reflection of our growing presence in the international food processing sector and our dedication to delivering tailored separation solutions.

If you’re looking for a dependable partner for high-performance centrifuge systems, GN Separation is ready to support your process needs.

GN Separation recently delivered its GNLW364 T Series Dewatering Decanter Centrifuge to an overseas environmental protection company, further expanding its global footprint in industrial and municipal sludge treatment. Known for its efficient performance and robust design, the GNLW364 centrifuge is ideally suited for high-demand dewatering applications across various industries.

Optimized for Dewatering Performance

The GNLW364 model belongs to GN’s T Series, a line of decanter centrifuges specifically engineered for dewatering and thickening purposes. Featuring an optimized beach angle of 8.5 degrees, the T Series is designed to extend the drying zone within the bowl, allowing for higher solid dryness and clearer liquid separation.

This series is widely applied for municipal and industrial wastewater sludge, where efficient dewatering and reduced moisture content are critical. For materials containing fine particles and low viscosity, flocculants are typically added to enhance solid-liquid separation performance before processing through the T Series decanter.

Key Features of the GNLW364 T Series Decanter Centrifuge

• Bowl Diameter: 360 mm

• Bowl Length: 1520 mm

• Max Speed: 3964 RPM

• Max G-force: 3200 G

• Main Motor Power: 22–37 kW

• Backdrive Motor Power: 7.5–11 kW

• Beach Angle: 8.5°

Intelligent and Safe Operation

This unit is equipped with a three-frequency conversion control cabinet — a smart electrical system that allows for independent control of the main motor, backdrive motor, and feed pump. Combined with real-time monitoring sensors for temperature and vibration, the system ensures safe, stable, and efficient operation, even under demanding conditions.

GN also integrates a complete alarm and protection system. If abnormal parameters such as overload, high temperature, or excessive vibration are detected, the machine automatically initiates safety protocols, including switching to plug removal or emergency shutdown procedures.

Durable Materials and High-Quality Construction

To guarantee longevity and performance, the bowl and end caps are made from duplex stainless steel (SUS2205 or SUS2304) via centrifugal casting, which provides superior resistance to corrosion and stress compared to conventional stainless steel grades like SUS304 or SUS316.

The screw conveyor is protected by replaceable tungsten carbide tiles, and the discharge ports are reinforced with wear-resistant tungsten carbide sleeves, significantly extending the service life of these high-wear components.

Compact and Service-Friendly Design

The GNLW364 adopts a compact layout, with both motors positioned at one end of the machine. This design not only saves space but also simplifies maintenance. GN’s decanters are also engineered for easy disassembly, and for larger models, hydraulic bearing removal systems are available to reduce the risk of component damage during maintenance.

Trusted by Global Environmental Companies

The overseas environmental firm selected the GNLW364 after rigorous evaluation due to its high dewatering performance, intelligent control system, and low maintenance requirements. With its reliable performance and energy-efficient operation, the GNLW364 is now playing a key role in helping the company meet strict environmental discharge standards and reduce waste handling costs.

Tailored Solutions from GN Separation

Beyond manufacturing high-quality dewatering decanter centrifuges, GN Separation provides turnkey solutions including material transport, classification, and complete sludge dewatering systems. Whether it’s municipal sludge, oily waste, drilling mud, or chemical wastewater, GN has the technology and experience to deliver custom-engineered solutions for complex separation challenges.

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GN Separation is proud to support sustainable environmental practices worldwide and looks forward to continued cooperation with global partners.