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Decanter Centrifuge: The Continuous Solution for Solid-Liquid Separation

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Decanter Centrifuge: The Continuous Solution for Solid-Liquid Separation

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Brand Name :	Longdai
Model Number :	LW
Price :	15000USD-25000USD
Payment Terms :	L/C,D/A,D/P,T/T,Western Union,MoneyGram
Supply Ability :	100Set Per Month
Delivery Time :	30 working days

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Decanter Centrifuge: The Continuous Solution for Solid-Liquid Separation

Decanter Centrifuge: The Continuous Solution for Solid-Liquid Separation

Equipment Positioning

The decanter centrifuge is the most widely used continuous sedimentation-type centrifuge in industrial solid-liquid separation. Unlike filter-based systems, it operates without filtration media, relying instead on a high-intensity centrifugal field generated by rapid rotation to accelerate solid particle settling—enabling highly efficient two-phase separation.

It excels at processing feeds with:

Wide fluctuations in solids concentration
Fine or ultrafine particles
Moderate to high viscosity

As a result, it has become standard equipment across municipal wastewater, oil & gas, food & beverage, mining, metallurgy, and chemical industries worldwide.

Working Process Explained

Feed slurry enters through a stationary feed pipe into the distribution chamber of the scroll conveyor, then is evenly discharged into the rotating bowl. Both the bowl and scroll rotate in the same direction, but at slightly different speeds (differential speed).

Under centrifugal force:

Solids rapidly settle onto the inner wall of the bowl and are continuously conveyed by the scroll toward the conical discharge end.
Liquid flows toward the cylindrical end and exits via an adjustable overflow weir or a centripetal pump.

The entire process—from feeding to solids discharge and liquid clarification—is fully automatic and continuous.

Core Components

Component	Description
Bowl Assembly	Cylindrical-conical design; cone angle typically 8°–15°; features longitudinal anti-slip ribs or wear-resistant liners
Scroll Conveyor	Rotates relative to the bowl; blade edges welded or coated with hardfacing alloys (e.g., tungsten carbide)
Differential Drive System	Planetary gearbox or hydraulic differential—ensures stable torque for reliable solids transport
Main Bearings & Base Frame	High-precision spherical roller bearings; monolithic cast base with vibration-damping mounts
Sealing & Protection	Mechanical seals (standard) or labyrinth seals—prevent leakage and external contamination
Electrical Control System	VFD drive cabinet + HMI touchscreen; supports data logging and remote communication

Key Advantages for International Clients

Advantage Dimension	Specific Benefits
Continuous Operation	No shutdown required for discharge—24/7 × 365 days/year operation
High Feed Flexibility	Handles inlet solids from 0.5% to 40% without performance loss
Adjustable Dewatering	Cake dryness fine-tuned in real time via differential speed and pond depth control
Low Consumable Costs	No filter cloths, plates, or disposable media—minimal recurring costs
Fully Enclosed & Eco-Friendly	Zero splashing or odor emissions—compliant with global HSE and environmental standards
Compact Footprint	Requires significantly less space than belt presses or plate-and-frame filters per unit capacity

Comprehensive Technical Specifications

(Standard range for industrial & municipal applications; fully customizable based on feed characteristics)

Parameter	Technical Range
Bowl Diameter	300 / 400 / 500 / 600 / 700 / 800 / 1000 mm
Length-to-Diameter Ratio (L/D)	3.5 : 1 – 5.0 : 1
Max Bowl Speed	5,000 rpm (smallest) – 1,800 rpm (largest)
Separation Factor (G)	2,000 – 4,500 G
Differential Speed	0.3 – 25 rpm (VFD infinitely adjustable)
Throughput Capacity	1.5 – 180 m³/h (material-dependent)
Solids Recovery Rate	94% – 99% (with optimized flocculation)
Cake Dry Solids	20% – 45% • Municipal sludge: 28–32% • Chemical sludge: 30–40%
Liquid Phase SS	200 – 3,000 mg/L (can be reduced to <100 mg/L with flocculant)
Main Motor Power	5.5 – 200 kW
Auxiliary Motor Power	2.2 – 75 kW
Noise Level	≤85 dB(A) (with acoustic hood)
Vibration Severity	≤4.5 mm/s (per ISO 10816, loaded/unloaded)
Operating Temperature	0°C – 90°C (high-temp models up to 120°C)
Materials of Construction
– Bowl	Duplex 2205 / 316L / Abrasion-resistant carbon steel
– Scroll	316L + tungsten carbide coating / ceramic inserts
– Casing	304 / 316L / Rubber-lined carbon steel
Sealing Type	Mechanical seal (standard) / Packing seal (optional)
Control System	PLC + industrial HMI; local/remote operation switchable
Communication Protocols	Modbus RTU/TCP, Profibus DP, Ethernet/IP
Protection Rating	Motors: IP55; Control cabinet: IP42 (IP54 outdoor option available)
Explosion Protection	Ex d IIB T4 / ATEX Zone 1 & 2 (optional)
Unit Weight	900 – 15,500 kg
Installation Method	Anti-vibration elastomeric base—no anchor bolts required

Optional Configurations

Option	Function
Centripetal Pump	Replaces overflow weir; enables real-time adjustment of centrate clarity
Back Pressure Plate	Increases cake dryness by extending residence time in conical zone
Bearing Temperature Sensors (PT100)	With over-temperature alarm for predictive maintenance
Vibration Sensors	Acceleration or velocity type; compliant with ISO 10816
CIP Spray System	Automated internal cleaning for sticky or adhesive materials
Acoustic Enclosure	Ensures noise ≤85 dB(A)—ideal for urban or indoor installations
Nitrogen Purging System	For explosion-proof or oxidation-sensitive applications
Extended Conical Section	Enhances dewatering pressure and cake compaction

Typical Global Application Scenarios

Industry	Application	Key Requirements	Target Regions
1. Municipal Wastewater	Thickening/dewatering of WAS, digested sludge, primary sludge	Reduce moisture from >98% to <75% for landfill/incineration/composting	Southeast Asia, India, Eastern Europe, South America
2. Oil & Gas	Oily sludge reduction, drilling mud recovery, tank bottom cleaning	Achieve <1% residual oil; integrate with thermal/solvent processes	Middle East, Central Asia, West Africa, Russia
3. Chemical & Pharma	Mother liquor separation, catalyst recovery, dye intermediate dewatering	Explosion-proof, corrosion-resistant, mechanical seals for solvents/acids/bases	Europe, North America, China, India
4. Food & Beverage	Starch dewatering, fruit pomace separation, yeast recovery, protein extraction	Hygienic design; high-value byproduct recovery	South America (juice), SE Asia (palm oil), Europe (dairy/beer)
5. Mining & Metallurgy	Tailings dewatering, coal wash water recycling, metal powder recovery	Extreme wear resistance, high-torque differential, anti-clogging design	Africa, South America, Australia, Mongolia
6. Livestock & Agri-Waste	Digestate separation, manure fractionation, poultry slurry treatment	Solid for compost/bedding; liquid for reuse or biogas	Southeast Asia, Eastern Europe, large US/Canadian farms
7. Textile & Dyeing	Sludge dewatering, size recovery, dye precipitation	Corrosion resistance (alkalis, salts), clog-resistant flow paths	Bangladesh, Vietnam, India, Pakistan

Conclusion: Separation Is Never “One-Size-Fits-All”

Solid-liquid separation is rarely solved by simply “buying a machine.” Particle size distribution, solids concentration swings, pH, temperature, viscosity, and chemical composition—all these variables directly impact performance.

The true strength of the decanter centrifuge lies in its adaptability and tunability: by adjusting rotational speed, differential speed, pond depth, and flocculant dosage, it delivers stable, predictable results across a wide operating envelope.

We understand that international buyers care less about glossy brochures and more about one question:

“With my sludge, on my site—what will it actually deliver?”

If you’re evaluating a project in municipal, oil & gas, chemical, food, mining, or agriculture, please share the following:

Material name and source
Inlet solids concentration (%) and target cake dryness (%)
Required throughput (m³/h or tons dry solids/day)
Temperature, pH, corrosivity, or flammability
Local power supply and explosion-proof requirements

We’ll provide a preliminary technical proposal and expected performance within one business day.

The decanter centrifuge isn’t a universal solution—but in the vast majority of solid-liquid separation challenges, it’s the closest thing to one.

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