Industrial decanter centrifuge solutions
Decanter Centrifuge for Continuous Solid-Liquid Separation
ZK SEPARATION supplies 2-phase and 3-phase decanter centrifuge systems for sludge dewatering, wastewater treatment, oil recovery, food, chemical, mining and other applications.
What Is a Decanter Centrifuge?
A decanter centrifuge, also called a solid bowl centrifuge or horizontal scroll centrifuge, is a continuous separation machine that uses centrifugal force to separate solids from liquids, or solids from two liquid phases. Compared with batch equipment such as filter presses, a decanter centrifuge supports continuous feed, continuous discharge and automated 24/7 operation.
ZK decanter centrifuges are available in 2-phase solid-liquid and 3-phase liquid-liquid-solid configurations for wastewater treatment, sludge dewatering, food processing, chemical production, mining slurry, oil sludge recovery, palm oil and olive oil extraction.
Key Advantages
- Continuous operation for stable industrial production
- High throughput with reduced manual intervention
- PLC, VFD and HMI control for process stability
- Configurable materials and wear protection
- Suitable for changing feed concentration and site conditions
Project Planning Notes
- Model selection should be based on real feed data or pilot testing when possible.
- Wear-part planning depends on feed abrasiveness and operating hours.
- Foundation, vibration isolation, piping and control integration should be confirmed early.
- Commissioning quality directly affects cake dryness, centrate clarity and solids recovery.
How an Industrial Decanter Centrifuge Works
Feed enters the rotating bowl through a fixed feed tube. As centrifugal force builds up, denser solids settle against the bowl wall while lighter liquid remains closer to the center. A scroll conveyor rotates at a differential speed and continuously transports the compacted solids toward the conical beach section for discharge.
Separation Process and Pond Depth
The liquid volume maintained in the cylindrical section is called pond depth. Adjustable weir plates help balance liquid clarity, solids recovery and cake dryness according to feed consistency. In practice, pond depth is one of the main levers used to trade clarity against dryness during commissioning.
Beach Section and Cake Dewatering
As the scroll conveys solids out of the liquid pond and up the conical beach, free liquid drains back into the pond before the cake reaches the solids discharge ports. Beach angle, differential speed and torque together determine how dry the discharged cake can be for a given feed.
Differential Speed and Continuous Discharge
The bowl and scroll rotate in the same direction at slightly different speeds. This differential speed controls solids conveying, residence time and cake dryness while clarified liquid overflows from the liquid discharge end.
Key Factors for Decanter Centrifuge Model Selection
Decanter centrifuge sizing depends on feed properties, separation target, solids loading and site requirements. Share these parameters with ZK engineers so we can recommend the suitable bowl size, drive system, materials and wear protection package.
| Selection factor | What to confirm | Why it matters |
|---|---|---|
| Bowl diameter | Required throughput, feed solids and available footprint | Influences throughput, settling area, torque capacity, installed power and overall machine footprint. |
| L/D ratio | Clarification demand, cake dryness target and residence time | A suitable length-to-diameter ratio improves residence time, clarification and cake dryness when matched to the process. |
| G force | Particle size, density difference and liquid viscosity | Higher centrifugal force improves fine solids capture when matched to material behavior. |
| Capacity range | Average and peak volumetric flow, feed DS% / TSS, solids loading (kg DS/h) and operating hours per day | Volumetric m³/h alone is not enough for sizing. Solids loading and feed concentration determine whether the machine is undersized, overloaded or unstable on cake discharge. |
| Materials | Corrosion, pH, chloride level, temperature and cleaning chemicals | Protects bowl, scroll and wetted parts in demanding process streams. |
| Wear protection | Abrasive solids, sand, minerals, crystals or sludge grit | Protects scroll flights, feed zone and solids discharge areas to reduce lifecycle cost. |
| Automation | Torque control, differential speed, main motor load, vibration, bearing temperature and PLC integration | Stabilizes performance during feed variation and supports 24/7 operation. |
| Explosion-proof option | Oil recovery, solvent, flammable gas or vapor, ATEX/IECEx or local hazardous-area requirements | Supports safer operation in oil sludge, petrochemical and special chemical applications. |
Decanter Centrifuge vs Other Separation Technologies
Decanter centrifuges are usually selected when the process needs continuous operation, wide solids tolerance and compact installation. The table below keeps the comparison practical for early equipment screening.
| Key factor | Decanter centrifuge | Filter press | Disc stack centrifuge |
|---|---|---|---|
| Best fit | Continuous solid-liquid separation and sludge dewatering | Batch cake dewatering where very high cake dryness is required | Fine clarification and liquid-liquid separation with low solids |
| Feed solids tolerance | Wide range, suitable for many sludge and slurry streams | Moderate, depending on filtration behavior and cloth condition | Low solids feed preferred to avoid frequent discharge/cleaning |
| Operation mode | Continuous 24/7 operation | Batch or semi-continuous operation | Continuous clarification with periodic solids discharge |
| Footprint | Compact footprint; skid-mounted package available on request | Larger footprint and more auxiliary handling equipment | Very compact vertical design |
| Maintenance focus | Wear parts, bearings, scroll, discharge ports and controls | Filter cloth washing/replacement and hydraulic system | Disc stack cleaning, seals and bowl service |
For a deeper comparison, read Decanter Centrifuge vs Filter Press and Decanter vs Disc Stack Separator.
2-Phase vs 3-Phase Decanter Centrifuge
Choose the separation mode according to your target phases and recovered products.
2-Phase Decanter Centrifuge
Separates suspended solids from one liquid phase. Typical applications include sludge dewatering, wastewater solids removal, food processing, fermentation broth, starch, mining slurry and chemical streams.
- Solid-liquid separation
- Cake dryness and solids recovery balanced by pond depth and differential speed
- Continuous discharge for stable production
3-Phase Decanter Centrifuge
Separates solids plus two liquid phases. Typical applications include oil sludge treatment, food waste oil recovery, palm oil, olive oil extraction and other oil-water-solid process streams.
- Oil, water and solids separation
- Adjustable liquid phase discharge
- Oil, water and solids recovery for process reuse or disposal reduction
ZK Decanter Centrifuge Series and Technical Range
ZK supplies standard industrial, food-grade, 3-phase and hazardous-area decanter centrifuge configurations. Final model selection should be confirmed according to feed material, solids loading, required separation target and site requirements.
Standard Industrial Series
For municipal sludge, industrial wastewater, chemical slurry, mineral slurry and other continuous solid-liquid separation applications.
Food and Beverage Series
Configured for food processing, fermentation, starch, protein, juice, edible oil and other hygienic process streams.
3-Phase Series
For oil sludge treatment, food waste oil recovery, palm oil, olive oil, coal tar and other oil-water-solid process streams.
Hazardous-Area / Explosion-Proof Options
Available on selected 2-phase and 3-phase machines for flammable vapor, solvent or hazardous-area applications, subject to ATEX/IECEx or local site requirements.
ZK Decanter Centrifuge Technical Specifications
Capacity values are indicative and depend on feed DS% / TSS, solids loading (kg DS/h), particle size and separation target. Share your feed data for model confirmation.
Standard Decanter Centrifuge Specifications
| Model | Speed (rpm) | Separation Factor | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Weight (kg) | Dimensions (mm) |
|---|---|---|---|---|---|---|---|
| LW250×1025 | 4500 | 2835 | 11 | 4 | 2~5 | 1400 | 2600×800×1200 |
| LW350×1435 | 3500 | 2435 | 15~22 | 5.5 | 4~15 | 2760 | 3750×1040×1350 |
| LW450×1845 | 3200 | 2580 | 30~37 | 7.5~11 | 10~40 | 4000 | 4200×1140×1450 |
| LW520×2150 | 3000 | 2620 | 55~75 | 11~15 | 15~70 | 6300 | 5050×1285×1550 |
| LW580×2400 | 2800 | 2546 | 75~90 | 15~18.5 | 25~80 | 7550 | 5600×1400×1655 |
| LW650×2600 | 2600 | 2460 | 90~110 | 22~30 | 30~90 | 11000 | 6000×1550×1800 |
| LW750×2800 | 2200 | 2033 | 110~160 | 30~45 | 40~100 | 16000 | 6600×1800×2000 |
Food & Beverage Industry Decanter Centrifuge
| Model | Speed (rpm) | Separation Factor | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Weight (kg) | Dimensions (mm) |
|---|---|---|---|---|---|---|---|
| LWY250×1025 | 5000 | 3500 | 11 | 4 | ≥1 | 1400 | 2600×800×1200 |
| LWY350×1435 | 4000 | 3136 | 22 | 5.5 | 3–5 | 2760 | 3750×1040×1350 |
| LWY450×1845 | 3500 | 3087 | 30 | 7.5 | 5–10 | 4000 | 4200×1140×1450 |
| LWY520×2150 | 3200 | 2982 | 45 | 15 | 10–15 | 6300 | 5050×1285×1550 |
| LWY580×2400 | 3000 | 2948 | 55/75 | 18.5 | 15–20 | 7550 | 5600×1400×1655 |
| LWY650×2600 | 2800 | 2854 | 75/90 | 22 | 20–30 | 11000 | 6000×1550×1800 |
Food Waste Treatment Decanter Centrifuge
| Model | Speed (rpm) | Separation Factor | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Weight (kg) | Dimensions (mm) |
|---|---|---|---|---|---|---|---|
| LWS250×1025C(X) | 5000 | 3500 | 11 | 4 | ≥1 | 1400 | 2600×800×1150 |
| LWS350×1435C(X) | 4000 | 3136 | 22 | 5.5 | ≥3~5 | 2750 | 3500×1280×1058 |
| LWS450×1845C(X) | 3500 | 3087 | 30 | 11 | ≥6~12 | 4000 | 4000×1350×1100 |
| LWS520×2150C(X) | 3200 | 2982 | 45 | 15 | ≥10~15 | 6300 | 4800×1540×1250 |
| LWS580×2400C(X) | 3000 | 2948 | 55~75 | 18.5 | ≥15~20 | 7550 | 4900×1705×1250 |
| LWS650×2600C(X) | 2800 | 2854 | 75~90 | 22 | ≥20~30 | 11000 | 5900×1865×1300 |
Fly Ash Treatment Decanter Centrifuge
| Model | Speed (rpm) | Bowl Diameter (mm) | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Weight (kg) | Dimensions (mm) | Separation Factor |
|---|---|---|---|---|---|---|---|---|
| LW450×1845B | 3200 | 450 | 37 | 15 | 10~15 | 4000 | 4000×1350×1100 | 2580 |
| LW520×2150B | 2800 | 520 | 55 | 18.5 | 25~30 | 6300 | 4800×1540×1250 | 2283 |
| LW580×2400B | 2600 | 580 | 75 | 22 | 30~35 | 7550 | 4900×1705×1250 | 2196 |
| LW650×2650B | 2400 | 650 | 90 | 30 | 40~50 | 11000 | 5900×1865×1300 | 2097 |
Explosion-Proof Decanter Centrifuge Specifications
| Model | Speed (rpm) | Separation Factor | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Weight (kg) | Dimensions (mm) |
|---|---|---|---|---|---|---|---|
| LWF250×1025C | 5000 | 3500 | 11 | 4 | 1~3 | 1250 | 2800×800×1150 |
| LWF350×1435C | 4000 | 3136 | 22 | 5.5 | 4~8 | 3200 | 3800×1050×1200 |
| LWF450×1845C | 3400 | 2913 | 37 | 11 | 8~12 | 3900 | 4800×1150×1450 |
| LWF520×2150C | 3200 | 2982 | 55 | 15 | 15~18 | 6000 | 5400×1250×1600 |
| LWF580×2400C | 3000 | 2923 | 75 | 22 | 20~25 | 7800 | 5900×1400×1700 |
| LWF650×2650C | 2800 | 2854 | 110 | 30 | 25~35 | 11500 | 6500×1650×1800 |
| LWF750×3200C | 2200 | 2033 | 132 | 45 | 45~55 | 15200 | 7500×1600×1800 |
| LWF800×3200C | 2000 | 1792 | 132 | 55 | 50~60 | 14500 | 4900×3000×1600 |
Technical Specifications & Materials
- Drive Type: VFD + PLC + HMI for precise control and automation
- Bowl Material: SUS2205/SUS2304/316L/316 Centrifugal Casting
- Scroll Material: SUS2205/SUS2304/316L/316 Centrifugal Casting
- Bearing: SKF/NSK high-quality bearings for reliability
Advanced Capabilities
- Custom Solutions: We can manufacture decanters with bowl diameters up to 1000mm
- Material Compatibility: Various material options for different process requirements
Note: All specifications are based on standard configurations. Custom modifications are available based on specific application requirements. Learn more about our OEM manufacturing capabilities or contact our technical team for tailored solutions.
Need exact model data? Send your feed material and capacity, or review ZK's OEM decanter centrifuge manufacturing capability.
Performance Features Built for Continuous Operation
The final configuration can be adapted to your process target, but these design areas usually determine stability, maintenance cost and long-term separation performance.
Automated Control System
PLC, VFD and HMI control help manage bowl speed, differential speed, torque, vibration and operating alarms during changing feed conditions.
Scroll and Discharge Design
Scroll flight geometry, feed zone design and discharge port protection are selected according to solids loading, abrasiveness and required cake dryness.
BD Plate (Baffle Disc) and Process Optimization
For municipal and industrial sludge dewatering, a BD plate (baffle disc) reshapes the internal flow pattern in the clarification zone. When matched to the feed and polymer conditioning, it can improve centrate clarity and solids recovery while helping reduce polymer overdosing.
Wear and Corrosion Protection
Duplex stainless steel, ceramic liners, tungsten carbide tiles and coatings protect critical zones in abrasive or corrosive applications.
Applications for ZK Decanter Centrifuges
Process needs differ by feed behavior: sludge dewatering prioritizes cake dryness and polymer control, oil sludge and edible-oil streams often need 3-phase recovery, food lines require hygienic materials, and mining slurry demands stronger wear protection. See application-specific configurations on the pages below.
Wastewater treatment
Sludge dewatering
Olive oil extraction
Oil sludge treatment
Surimi processing
Algae dewatering
Starch separation
Palm oil extraction
Avocado oil extraction
Animal manure dewatering
Cane sugar dewatering
Tapioca starch dewatering
Regenerated fiber dewatering
Cement plant fly ash dewatering
Shield tunneling slurry dewatering
Don’t see your industry? Contact us with your feed material and process targets — we also support other solid-liquid and three-phase separation applications.
Why ZK as Your Decanter Centrifuge Manufacturer
ZK SEPARATION focuses on industrial centrifuge engineering, manufacturing and application-specific model selection. The team supports customers from feed material evaluation and process design to equipment configuration, factory testing, commissioning, overseas service and spare parts planning.
- 2-phase and 3-phase decanter centrifuge product lines
- Wear protection and material options for abrasive or corrosive streams
- PLC automation, torque protection and process monitoring options
- Application experience in wastewater, sludge, oil recovery, food, chemical and mining
Total Cost of Ownership and Maintenance
For decanter centrifuge projects, purchase price is only one part of the decision. Energy use, polymer consumption, wear-part life, bearing maintenance and downtime planning all affect real operating cost.
Energy and Polymer Optimization
- VFD control and suitable differential speed reduce unnecessary power draw.
- Correct pond depth, scroll design and feed conditioning help improve cake dryness.
- For sludge dewatering, process tuning can reduce polymer overdosing and improve centrate clarity.
Maintenance and Spare Parts
- Critical wear zones include scroll flights, feed zone, solids discharge ports and bowl protection areas.
- SKF/NSK bearing options and planned service intervals support continuous-duty operation.
- ZK can recommend spare-part packages according to feed abrasiveness and annual running hours.
Related Technical Articles
Related ZK technical articles on separation technology comparison, sizing criteria and key performance parameters for model selection.
Customer Feedback
Feedback from customers after installation and commissioning.
Since we installed the ZK decanter, oil recovery stayed stable through the season and maintenance stops were minimal under continuous harvest operation.
Food processing customer, Italy
ZK's unit handled our changing sludge loads better than expected, especially during unstable municipal wastewater conditions.
Municipal wastewater plant, Australia
The duplex stainless design has held up well in our corrosive process, and the centrifuge continues to run in continuous operation.
Chemical industry customer, Malaysia
Customer Cases by Application
Selected projects from wastewater solids removal, oil sludge recovery, food waste oil recovery and olive oil extraction. Each case reflects a different feed profile and separation target.
Wastewater treatment
Decanter centrifuge for industrial wastewater solids removal and stable treatment operation.
Oil sludge recovery
3-phase separation for oil, water and solids in oily sludge treatment.
Food waste oil recovery
Continuous decanter system for resource recovery from food waste streams.
Olive oil extraction
LWS350 and LWS450 olive oil decanter centrifuges shipped for extraction and separation.
Decanter Centrifuge FAQ
Answers to common technical and purchasing questions before model selection.
What information should I share for a model recommendation?
To recommend a suitable model, please share your feed material, expected flow rate (capacity) and separation target. If available, solids content, temperature, particle size and abrasion level will help us refine the recommendation. Our engineers can help identify any additional data needed.
How is decanter centrifuge capacity determined?
Capacity is determined by both volumetric flow and solids loading. A machine that handles the required m³/h on dilute feed may be undersized for the same flow with higher DS% or abrasive solids. ZK evaluates feed data, separation targets and operating hours before confirming a capacity range.
What affects cake dryness and solids recovery?
Cake dryness and solids recovery depend on material properties, polymer conditioning, bowl speed, differential speed, pond depth, beach angle, scroll torque, feed stability and correct equipment sizing. These targets often need to be balanced during commissioning rather than maximized at the same time.
What materials are decanter centrifuges made from?
Common wetted-part options include duplex stainless steel 2205/2304 (SUS2205/SUS2304) and AISI 316L/316. Wear zones can be protected with tungsten carbide tiles, ceramic liners or hard-facing. Material selection depends on corrosion, abrasion, temperature and hygiene requirements.
What maintenance is required for decanter centrifuges?
Operators should monitor vibration, bearing temperature, torque, unusual noise and cake/centrate quality. Wear parts such as scroll flight protection, feed zone inserts and solids discharge ports need planned inspection based on feed abrasiveness and running hours. Lubrication intervals follow the bearing and gearbox design of the selected machine.
How long do decanter centrifuges last?
With correct material selection, wear protection and scheduled service, industrial decanter centrifuges commonly operate for 10+ years. Service life depends on feed abrasiveness, duty hours, maintenance quality and process chemistry.
Can decanter centrifuges handle abrasive materials?
Yes, when wear protection is matched to the feed. Critical zones such as scroll flights, feed zone and solids discharge ports can be protected with tungsten carbide, ceramic or hard-facing packages. Mining slurry, tunneling mud and grit-laden sludge usually need stronger protection than clean food streams.
What should I consider when preparing for installation?
Once a model is selected, the project team will confirm the foundation and vibration isolation, available footprint and lifting route, feed and discharge piping, drainage, electrical supply, control integration and any hazardous-area classification. Requirements depend on the selected model and scope of supply.
What is the difference between a decanter centrifuge and a disc stack centrifuge?
Decanter centrifuges use a horizontal bowl and scroll for continuous solid-liquid or three-phase separation with wider solids tolerance. Disc stack centrifuges use stacked conical discs for fine clarification or liquid-liquid separation, usually with lower solids loading. For a full comparison, read Decanter vs Disc Stack Separator.
How much does a decanter centrifuge cost?
Price depends on bowl diameter, materials, drive package, wear protection, hazardous-area options and scope of supply. As a broad commercial range, many standard industrial units fall roughly between USD 20,000 and 200,000+, while larger or highly customized systems can be higher. Send feed data and capacity targets for a project-specific quotation via the contact page.
