Decanter Centrifuge for Biogas Plant Digestate Dewatering and Management

Decanter Centrifuge for Biogas Plant Digestate Dewatering and Management

Product Item : DLW
Category： Decanter Centrifuge
Certification:CE Certificate
Core Components: PLC, Engine, Bearing, Motor, Gear
Keyword: calcium hypochlorite separation
Description: Solid-liquid Separation Machine
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Decanter centrifuge descriptions

The horizontal decanter centrifuge is highly acclaimed for its efficient centrifugal separation. During operation, both the drum and screw rotate at high speed in the same direction. As material enters through the screw feed tube, it swiftly accelerates into the drum. Driven by centrifugal force, the heavier solid-phase material deposits on the drum wall. The screw conveyor then propels the solid phase towards the drum’s conical end, facilitating discharge through the slag discharge port. Concurrently, the lighter liquid phase forms an inner ring, overflowing and subsequently discharged through the liquid discharge port, ensuring a seamless and efficient continuous separation.

This centrifuge boasts notable features, such as fully enclosed operation to maintain cleanliness, minimal coagulant and water usage, and a compact layout that minimizes land and infrastructure investments. The machine is designed to achieve continuous feeding, separation, washing, and discharging at full speed, ensuring stable production. It finds versatile applications across various industries, excelling particularly in the separation of suspended liquids with particle sizes above 0.005mm and concentrations ranging between 2-40%. Widely employed in chemical, light industry, pharmaceuticals, food, and environmental protection, it stands as a dependable solution for centrifugal separation.

How does a decanter centrifuge work?

The working process of the horizontal screw centrifuge can be simplified into the following steps:

The mixed liquid enters the center of the drum through the feed pipe;
As the drum rotates at high speed, the centrifugal force throws the denser solids to the outer wall to form a sediment layer;
The clarified liquid is located in the middle or inner layer and is discharged through the overflow port;
The solid sediment is continuously discharged along the conical end to the slag outlet under the push of the screw conveyor.
This process realizes continuous, automated, and closed separation operations, which can meet various industrial needs.

Decanter centrifuge advanced operation capabilities

Clarification

Clarification removes suspended solids from a liquid of lower density across a particle size range from 1 to 10,000 microns. By increasing centrifugal force, even submicron particles can be separated, making this process ideal for high-purity applications in chemicals, mining, and waste management.
Classifying
Through controlled reduction of residence time, the decanter achieves sharp separation cuts for particle-size classification down to the submicron range. This capability is essential for processes requiring precise particle distribution and custom engineering solutions.
Liquid/liquid separation
The efficiently separates immiscible liquid phases of different densities, with or without solids present. This is critical for oil recovery and industrial wastewater treatment, where mechanical dewatering and centrifugal separation reduce reprocessing and disposal costs.
Thickening
Fine solids separated from the liquid can be thickened in a hindered settling mode, utilizing the cylindrical section of the bowl for maximum compression. This improves solids handling and reduces downstream load, contributing to operational efficiency.
Compression and dewatering
Compactive dewatering combines drainage and compression to achieve a higher degree of dryness, even with compressible solids. The degree of dewatering depends on solids characteristics, machine settings, and required dryness levels. Optimized conveyor and cone geometry, along with differential speed control, ensure stable discharge of pasty or shear-sensitive solids—key for waste management and cost reduction.
Counter-current washing
Integrated washing systems allow efficient, cost-effective removal of contaminants by separate discharge of wash liquor over multiple sections. This reduces chemical and water consumption, aligning with sustainability and process optimization goals.
Mixing and re-suspension
Special discharge geometries enable solids to be mixed with liquid directly at the outlet, eliminating the need for additional mixing vessels. This feature simplifies plant design and enhances operational efficiency.
Automation and innovation
Control systems for smart operation
Control systems stabilize separation quality, automate setpoints, and provide diagnostics that support predictive service strategies. As the “brain” behind the process, strengthens industrial automation and helps maintain equipment reliability through better visibility, alarms, and optimization tools.
Engineered for tough conditions
A broad choice of materials of construction, wear protection, and sealing options extends service life in abrasive or corrosive duties. Features like CIP, optimized bearings and seals, and gas-tight/pressurized casings are designed to lower maintenance effort while keeping performance high.
Options that boost performance
Depending on application, It can be equipped with energy-recovery weir plates, specialized feed systems to reduce particle breakage, and multiple drive/gearbox configurations—each selected to match duty conditions and performance targets.

Decanter centrifuge specifications

1. All contact parts can be made by SS304/SS316L/Duplex Steel 2205.
2. Automatic adjustment of differential speed via VFD,Siemens PLC Spiral.
3. Two motor drive.
4. Approximately 80 to 90% of the oil is recovered.
5. Low labor costs due to continuous and automatic operation.
6. Highest g-force for higher solids output.
7. Belts for both primary motor and secondary.
8. NSK/SKF Bearing.

Model	Drum diameter mm	Length mm	Maximum speed rpm	Highest separation factor g	Mixture capacity m³/h
LW250-900	250	900	5000	3500	0.5-3
LW350-1500	350	1500	3800	2850	1-5
LW400-1200	400	1200	3400	2581	1-8
LW400-1600	400	1600	3400	2581	2-10
LW400-1800	400	1800	3400	2581	2-12
LW450-1800	450	1800	3200	2572	5-20
LW450-2000	450	2000	3200	2572	5-25
LW530-2280	530	2280	2800	2350	10-50
LW600-2400	600	2400	2600	2265	15-65
LW650-2600	650	2600	2400	2100	20-80
LW720-2500	720	2500	2200	1950	25-90
LW800-2560	800	2560	2000	1800	30-100
LW800-3200	800	3200	2000	1800	30-110
LW900-3200	800	3200	1800	1650	30-150

Why choose the DAGYEE decanter centrifuge?/Decanter centrifuge advantages

1. continuous and automatic operation
2. no need for monitoring with an operator (lower operating costs)
3. longer time intervals between maintenance (3,300 hours)
4. flow rates from 1 m3/h up to 180 m3/h
5. safe and effective separation of the phases
6. remotely activated and monitored process

Decanter centrifuge key features

1. One of the notable features of DAGYEE’s screw decanter centrifuge is its ability to achieve low residual moisture content in the separated solids. This ensures that the dewatered solids have a significantly reduced water content, making them easier to handle and dispose of.
2. The screw decanter centrifuge manufactured by DAGYEE boasts a large length-to-diameter ratio, reaching an impressive 4.4. This design feature enhances the sedimentation and separation process, allowing for improved efficiency and a higher capacity for solid-liquid separation.
3. The small differential speed system employed by DAGYEE’s screw decanter centrifuge is another highlight. This system ensures precise control over the speed difference between the bowl and the screw conveyor, optimizing the separation process and achieving exceptional separation results.
4. Operating at a noise level below 65 dB(A), DAGYEE’s screw decanter centrifuge demonstrates low noise emissions. This feature is beneficial in industrial settings where noise reduction is crucial for a comfortable working environment.
5. In addition to its performance advantages, DAGYEE’s screw decanter centrifuge is also energy-efficient, consuming minimal power. This not only reduces operational costs but also contributes to energy savings and sustainability. Moreover, the low power consumption translates into lower maintenance costs, making it a cost-effective solution.
6. DAGYEE’s screw decanter centrifuge is built with precision-engineered dynamic components and a carefully balanced operating speed, ensuring smooth and stable operation. This reliability minimizes downtime and maintenance requirements, enhancing overall productivity.
7. With a high separation coefficient and a large processing capacity, DAGYEE’s screw decanter centrifuge excels at achieving efficient and effective separation of solids from liquids. It can handle substantial volumes of feed, making it suitable for applications that demand high throughput.
8. Furthermore, DAGYEE’s screw decanter centrifuge offers the advantage of continuous processing and a high degree of automation. Its seamless operation allows for uninterrupted production, while advanced automation features enable precise control and monitoring, enhancing process efficiency.

Decanter centrifuge applications

Wastewater Treatment
Screw decanter centrifuges are extensively used in wastewater treatment plants. They can effectively separate solid sludge from wastewater, allowing for the removal of contaminants and the production of clean water for discharge or reuse. The dewatered sludge can be further processed for disposal or used for energy generation.

Chemical Industry
In the chemical industry, screw decanter centrifuges are utilized for various processes, including the separation of solids from liquid suspensions, clarification of chemical solutions, and dewatering of chemical sludge. They play a crucial role in achieving product purity, recovering valuable chemicals, and minimizing waste generation.

Food and Beverage Industry
Screw decanter centrifuges are employed in the food and beverage industry for processes such as clarification of fruit juices, extraction of oils from seeds, separation of solids from dairy products, and dewatering of food waste. These centrifuges help maintain product quality, improve production efficiency, and reduce waste.

Petrochemical Industry
Screw decanter centrifuges find applications in the petrochemical industry for the separation of solids from various hydrocarbon streams. They are used in processes such as oil sludge treatment, removal of catalyst particles from chemical reactions, and clarification of petroleum products.

Mining and Minerals Processing
In mining and minerals processing, screw decanter centrifuges are utilized for dewatering and separation of fine particles from slurries. They are commonly used in coal preparation plants, mineral processing plants, and tailings management to recover valuable minerals and reduce water content in the processed materials.

Pharmaceutical Industry
Screw decanter centrifuges play a crucial role in pharmaceutical manufacturing processes. They are employed for the separation of solids from fermentation broths, purification of pharmaceutical intermediates, and recovery of active ingredients from plant extracts.

Environmental Remediation
Screw decanter centrifuges are utilized in environmental remediation projects for the treatment of contaminated soil, sediment, and groundwater. They help separate and dewater the solid contaminants, allowing for proper disposal or further treatment.

Oil and Gas Industry
In the oil and gas industry, screw decanter centrifuges are used for the separation of oil and water emulsions, removal of solids from drilling mud, and dewatering of oil sludge generated during oilfield operations. They contribute to the efficient processing of crude oil, wastewater treatment, and environmental compliance.