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Olive Oil

Industrial Application — Oils & Fats

Olive Oil Centrifuge for Industrial-Scale
Extraction & Clarification

Disc stack centrifuge and decanter centrifuge engineered for the full olive oil processing chain — from malaxation discharge through polishing clarification. Factory-direct configurations for two-phase and three-phase extraction systems.

≥ 98%
Oil Recovery Rate
<0.1%
Residual Water in Oil Phase
2–8°C
Cold Press Temperature Control
24/7
Continuous Operation

Process Overview

How Centrifugal Separation Works in Olive Oil Processing

Olive oil extraction relies on mechanical cell disruption followed by phase separation. After the olive paste exits the malaxer, a decanter centrifuge performs the primary solid-liquid separation, splitting olive pomace from the oil-water emulsion at forces typically between 3,000 and 4,000 × g. This step defines throughput capacity and pomace dryness — both critical for oil yield and downstream processing efficiency.

The oil-water mixture produced by the decanter still contains fine suspended solids, wax particles, and colloidal impurities. A disc stack centrifuge (vertical-spindle type) performs polishing separation at up to 10,000 × g, delivering clarified oil with turbidity below 5 NTU and removing residual moisture to protect shelf life and preserve polyphenol content. This two-stage centrifuge configuration is the international standard for premium extra virgin olive oil (EVOO) production.

Cold-extraction compliance: Both the decanter centrifuge and disc centrifuge can be equipped with temperature monitoring and process water control systems to maintain oil temperature below 27 °C throughout the separation cycle — a mandatory threshold for EVOO designation under EU Regulation 1234/2007.

The choice between a two-phase and three-phase olive oil decanter centrifuge is one of the most consequential decisions in plant design. A two-phase decanter produces an olive pomace phase and an oil-water phase, requiring minimal added water and generating less vegetation water (alpechín) — a significant environmental and operational advantage in water-scarce regions. A three-phase decanter produces oil, vegetation water, and pomace as three discrete streams, simplifying oil recovery but generating larger volumes of wastewater that require treatment.

Selecting the correct centrifuge is a function of raw material quality, target output grade (EVOO, virgin, lampante), available water resources, and downstream pomace handling. As a centrifuge manufacturer, we offer both configurations with matching horizontal bowl geometries, scroll pitch designs, and differential speed control (back-drive gearbox) optimized specifically for olive paste rheology.

Full Processing Chain

Centrifuge Integration Points in the Olive Oil Production Line

Each stage of the olive oil extraction process presents distinct separation challenges. The centrifuge equipment must be matched to the upstream and downstream process conditions at each point.

01
Washing & Crushing
Olives are cleaned, weighed, and milled into paste. No centrifuge at this stage, but wash water quality and crusher type directly affect downstream centrifuge loading.
02
Malaxation
Paste is kneaded at controlled temperature (20–27 °C) for 20–40 min to break oil-in-water emulsions and facilitate droplet coalescence before centrifuge entry.
03
Decanter Centrifuge
Horizontal scroll decanter separates solid pomace from liquid phase at 3,000–4,000 × g. Core process step determining oil yield and pomace moisture.
Primary Separation
04
Disc Stack Centrifuge
Vertical disc centrifuge removes residual solids and excess water from the oil phase at up to 10,000 × g. Governs final clarity, color, and polyphenol retention.
Polishing / Clarification
05
Vegetation Water Treatment
Three-phase systems generate alpechín; optional disc separator applied here recovers residual oil from vegetation water before effluent treatment.

Equipment Selection

Centrifuge Types for Olive Oil Applications

Two centrifuge families are central to any olive oil processing plant. Each addresses a different separation task and must be correctly specified to avoid yield loss, excessive maintenance, or product quality degradation.

Olive Oil Decanter Centrifuge
Primary solid-liquid separation

The horizontal scroll decanter centrifuge is the workhorse of olive oil extraction. It continuously processes olive paste discharged from the malaxer, separating solid pomace at one end and liquid oil-water phase at the other. Bowl length-to-diameter ratio (L/D), scroll pitch, and differential speed — all optimized for high-moisture, high-viscosity olive paste — are the critical design parameters that determine separation efficiency and pomace dryness.

  • Bowl diameter range: 250 mm – 660 mm; L/D ratio 3.5–4.5
  • Feed rate: 1 t/h – 20 t/h of olive paste
  • G-factor: 2,500–4,200 × g selectable via VFD
  • Two-phase and three-phase configurations available
  • Scroll wear protection: tungsten carbide tiles on leading edges
  • CIP-ready design; 316L stainless steel bowl and scroll
  • Back-drive gearbox (differential speed): 0.5–15 RPM adjustable
  • Pomace discharge moisture: < 25% wet basis (two-phase)
Disc Stack Centrifuge
Oil polishing & clarification

The vertical-spindle disc stack centrifuge (disc separator) receives the decanter oil-water output and performs fine clarification. Hundreds of conical discs stacked at 35–50° half-angle reduce the sedimentation path to millimeters, enabling separation of particles down to 0.5 µm and water droplets down to 1 µm. For EVOO production, this stage defines product clarity, free acidity retention, and compliance with polyphenol grading standards.

  • Bowl speed: 4,500–8,500 RPM; G-force up to 10,000 × g
  • Disc number: 80–200 discs per bowl (model-dependent)
  • Process water dosing: proportional injection for emulsion breaking
  • Self-cleaning (hermetic) discharge — prevents re-emulsification
  • Oil turbidity output: < 5 NTU (polished grade)
  • Residual water in oil: < 0.1% by volume
  • CIP in-place cleaning cycle; EHEDG-compliant sealing
  • Flow rates: 0.5 m³/h – 30 m³/h (model series)
Olive Oil Decanter Centrifuge EVOO Disc Centrifuge Two-Phase Decanter Three-Phase Decanter Oil Polishing Separator Vegetation Water Recovery Cold Extraction System

Two-Phase vs. Three-Phase

Decanter Centrifuge Configuration Comparison for Olive Oil

The selection between two-phase and three-phase decanter centrifuge configurations has lasting consequences for oil quality, wastewater volume, water consumption, and overall extraction efficiency. The table below enables a direct operational comparison.

Parameter Two-Phase Decanter Three-Phase Decanter
Water Addition to Paste 0–20 L/100 kg olives 40–60 L/100 kg olives
Vegetation Water (Alpechín) Volume Very low (10–25 L/100 kg) High (60–100 L/100 kg)
Pomace Moisture Content 20–28% (wet basis) 28–35% (wet basis)
Oil Retention in Pomace Higher (2–3%) Lower (1–1.5%)
Polyphenol Preservation Higher Moderate
EVOO Compliance Suitability Recommended With Optimization
Wastewater Treatment Load Low High
Throughput at Identical Bowl Size Slightly Higher Standard
Downstream Disc Centrifuge Requirement Mandatory Mandatory
Energy Consumption (kWh/t olive) 3.5–5.5 4.5–7.0
Typical Application Region Spain, North Africa, water-scarce areas Italy, Greece, Greece large-scale plants

Technical Specifications

Key Parameters — Olive Oil Centrifuge Series

Standard specification ranges for the olive oil decanter centrifuge and disc stack centrifuge series. Custom bowl geometries, material grades, and automation levels are available on request for specific production requirements.

Olive Oil Decanter Centrifuge — Mechanical
Bowl Diameter250 – 660 mm
Bowl Speed (Max)3,200 – 4,500 RPM
G-Factor2,500 – 4,200 × g
L/D Ratio3.5 – 4.5
Differential Speed0.5 – 15 RPM (back-drive)
Drive Motor7.5 – 110 kW
Bowl Material316L / Duplex 2205
Olive Oil Decanter Centrifuge — Process
Olive Paste Feed Rate1 – 20 t/h
Pomace Moisture (2-phase)< 25% wet basis
Oil Loss in Pomace< 2.5% on dry matter
Process Temp. (EVOO)≤ 27 °C
CIP CycleFully automated
Control InterfacePLC + HMI (Siemens / Allen-Bradley)
Noise Level< 78 dB(A)
Disc Stack Centrifuge (Polishing) — Mechanical
Bowl Diameter200 – 800 mm
Spindle Speed4,500 – 8,500 RPM
G-FactorUp to 10,000 × g
Disc Count80 – 200 discs
Disc Half-Angle35° – 50°
Drive Motor2.2 – 45 kW
Discharge TypeHermetic / Self-cleaning nozzle
Disc Stack Centrifuge (Polishing) — Process
Oil Flow Rate0.5 – 30 m³/h
Output Oil Turbidity< 5 NTU
Residual Water in Oil< 0.1% v/v
Min. Separable Particle0.5 µm
Process Water InjectionProportional dosing pump
Sealing StandardEHEDG / FDA 21 CFR
Surface Finish (Wetted)Ra ≤ 0.8 µm

Why Centrifugal Separation

Centrifuge vs. Traditional Press — Performance Advantages

Traditional hydraulic pressing and percolation (sinolea) methods have given way to centrifuge-based extraction in over 90% of commercial olive oil mills globally. The reasons are engineering-driven, not preference-based.

10×
Higher Throughput
A single decanter centrifuge processes 5–20 t/h of olive paste continuously; a hydraulic press requires batch loading, pressing cycles, and manual mat handling — incompatible with modern harvest volumes.
↑ 15%
Higher Oil Yield
Centrifugal force extracts oil more completely from the aqueous phase than percolation. Two-phase centrifuge configurations achieve <2.5% residual oil on dry pomace versus 4–6% for press-based extraction.
CIP
Closed, Hygienic System
Centrifuge bowls and disc stacks operate as fully enclosed systems. CIP (clean-in-place) cycles eliminate cross-batch contamination and oxidation exposure that erode phenolic content in press operations.
24/7
Continuous Operation
Both decanter and disc centrifuges run continuously without batch interruption, synchronizing with upstream malaxation and downstream storage/filtering for full-line automation and consistent oil quality.
≤27°C
Cold Extraction Control
Temperature is precisely controlled via process water injection and insulated bowl design. EVOO-grade cold extraction compliance is reproducible across every production run — not dependent on ambient conditions.
VFD
Adjustable Separation
Variable-frequency drives on both bowl and back-drive motors allow real-time adjustment of G-force and differential speed as olive variety, ripeness, and moisture change through the harvest season.

Specification Guide

How to Select the Right Olive Oil Centrifuge

Centrifuge selection for an olive oil production plant involves interconnected decisions across capacity, configuration, materials, and automation. Below are the primary selection dimensions and what each determines.

Step 01 — Capacity
Match Decanter to Harvest Throughput
Size the decanter centrifuge bowl to handle peak daily olive intake ÷ operating hours. Undersizing causes paste queuing and quality degradation; oversizing raises capital cost and energy per tonne. Standard rule: select 20% buffer above peak throughput.
Step 02 — Configuration
Two-Phase or Three-Phase Decanter
If water resource is limited or polyphenol preservation is a priority product claim (EVOO premium), specify two-phase. If downstream vegetation water re-use or simple oil-water-pomace stream management is needed, three-phase is standard.
Step 03 — Polishing
Select Disc Centrifuge Flow Rate
The disc stack centrifuge must match the net oil-water output of the decanter, not the raw paste feed rate. Calculate: (decanter feed rate) × (oil + water fraction) to determine the required disc separator capacity in m³/h.
Step 04 — Materials
Bowl Alloy and Surface Finish
316L stainless is standard for most applications. High-polyphenol varieties (e.g., Picual, Koroneiki) in acidic conditions benefit from Duplex 2205 or electropolished surfaces (Ra ≤ 0.4 µm) to prevent iron migration into oil, which catalyzes oxidation.
Step 05 — Automation
PLC Integration and Remote Monitoring
Modern centrifuge installations integrate with plant-level SCADA via OPC-UA or Modbus TCP. Automated CIP sequencing, vibration monitoring, and bowl speed feedback reduce labor requirements and extend service intervals.
Step 06 — Compliance
Certifications and Documentation
For EU, US, and Middle East export markets, confirm CE marking, FDA 21 CFR materials compliance, and EHEDG hygienic design certification on food-contact components. Factory FAT (factory acceptance test) protocols available on request.

Technical Questions

Frequently Asked Questions — Olive Oil Centrifuge

What is the difference between a decanter centrifuge and a disc centrifuge in olive oil processing?
A decanter centrifuge (horizontal scroll type) handles the primary separation of solid olive pomace from the liquid oil-water mixture. It processes high-solids paste at moderate G-force (2,500–4,200 × g) and runs at several tonnes per hour. A disc stack centrifuge (vertical spindle type) processes only the liquid oil-water fraction coming out of the decanter. It operates at much higher G-force (up to 10,000 × g) to remove fine suspended solids and residual water from the oil, delivering the clarity and low-moisture content required for storage-stable, premium-grade olive oil. Both centrifuge types are mandatory in a complete extraction line; they address different separation tasks and cannot substitute for each other.
Can a centrifuge process olive oil at cold-extraction temperatures for EVOO certification?
Yes. Both the decanter centrifuge and disc centrifuge can be configured for cold-extraction compliance. Temperature control on the decanter is achieved by limiting process water temperature and using thermally insulated feed pipes. The disc centrifuge is inherently suited to cold processing because the separation occurs in milliseconds with minimal frictional heating. EU Regulation 1234/2007 requires oil temperature not to exceed 27 °C during extraction for EVOO labeling. Our centrifuge systems include inline temperature sensors and interlocked process water dosing to maintain and log compliance with this threshold automatically.
How do I choose between a two-phase and three-phase olive oil decanter centrifuge?
The key deciding factors are: (1) Water availability — two-phase decanters add minimal water to the paste (0–20 L per 100 kg olives vs. 40–60 L for three-phase), making them preferred in water-scarce regions. (2) Effluent treatment capacity — three-phase systems generate significantly more vegetation water (alpechín) requiring treatment or disposal; if wastewater handling is costly or restricted, two-phase is more practical. (3) Oil quality target — two-phase systems preserve more polyphenols in the oil because less water contacts the paste, so the water-soluble phenolics stay in the oil fraction rather than being washed out. For EVOO production with polyphenol content as a marketing claim, two-phase is almost always the preferred configuration.
What maintenance is required for an olive oil decanter centrifuge?
The primary wear components on a decanter centrifuge used for olive oil are: (1) Scroll wear protection — leading edges of the scroll conveyor contact abrasive pomace continuously. Tungsten carbide tiles or stellite hardfacing are standard. Inspection interval: every 500–1,000 operating hours during harvest season. (2) Main bearings — lubricated with food-grade grease; relubrication interval per OEM schedule, typically every 250–500 hours. (3) Back-drive gearbox — oil change every 2,000 hours or annually. (4) Seals and lip gaskets — checked at end-of-harvest CIP cycle. For disc centrifuges, disc stacks are inspected for deposits (wax, olive stone fines) annually; the hermetic discharge valve seats are the highest-frequency service item.
What bowl material should be specified for high-polyphenol olive varieties?
For high-polyphenol olive oil varieties (Picual, Koroneiki, Coratina) where the product's oxidative stability is a premium attribute, specifying Duplex 2205 stainless steel or electropolished 316L with Ra ≤ 0.4 µm surface finish is recommended. The reason is iron migration: standard 316L at Ra values above 0.8 µm can release trace iron into the oil, which acts as a pro-oxidant catalyst and accelerates polyphenol degradation during storage. Duplex 2205 has lower iron leaching rates and superior pitting resistance in acidic (pH 4–5) olive paste environments. For standard commercial grade olive oil production, 316L with standard mill finish is entirely adequate and more cost-effective.
Can one centrifuge unit handle the full range of olive varieties and ripeness levels within a single harvest season?
Yes, if the centrifuge is specified with VFD (variable-frequency drive) control on both the main bowl motor and the back-drive differential speed. Early-harvest olives (high phenolics, lower moisture, denser paste) require lower differential speed and higher G-force to achieve acceptable pomace dryness. Late-harvest olives (higher oil content, higher moisture, softer paste) often run optimally at higher differential speeds to prevent scroll overload. A properly specified olive oil decanter centrifuge with independent VFD control on both drives can adapt to this variation by operator adjustment of running parameters — typically guided by a process parameter chart supplied with the equipment at commissioning.

Specify Your Olive Oil Centrifuge Configuration

Factory-direct centrifuge solutions for two-phase and three-phase olive oil extraction. Submit your process parameters for a technical configuration recommendation and quotation from our engineering team.

Request Technical Quotation Decanter Centrifuge
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