Advanced Separation Solutions for Olive Processing
Improve Sustainability, Product Quality, and Resource Recovery with VSEP Vibratory Membrane Filtration
Olive processing generates several challenging liquid streams—from table olive curing brines to olive oil clarification and milling wastewater. These streams are typically high in organics, solids, salinity, and specialty compounds such as polyphenols. Traditional handling methods often rely on land application, basic centrifugation, or single‑use water discharge, which introduces environmental constraints, operational inefficiencies, and lost product value.
VSEP (Vibratory Shear Enhanced Processing) uses high‑frequency vibratory membrane filtration to treat these difficult liquids at extremely high flux rates—reducing fouling, enabling water reuse, improving oil quality, and recovering valuable compounds for sale or reuse.
1. Table Olive Washing & Curing Wastewater
Process Description
During table olive production, olives are washed and cured in brines that remove sugars, bitter compounds, suspended solids, and fermentation byproducts. This generates a high‑strength wastewater containing:
- High salinity
- Oils and suspended solids
- Phenolic compounds and organic acids
- Strong odor‑producing organics
Traditional Treatment Methods
| Method | Typical Practice | Key Limitations |
| Land Application | Wastewater spread on fields or orchards. | Causes odor issues, soil salinization, toxic buildup of polyphenols, and clogging of drip irrigation systems. Increasingly restricted by regulators. |
| Evaporation Ponds | Passive evaporation of brines. | Slow, land‑intensive, produces sludge, and has odor and insect issues. |
| Discharge to Sewer | Pretreatment + municipal discharge. | High surcharges, capacity limits, or outright rejection due to organics and salinity. |
How VSEP Improves the Process
VSEP uses robust membranes (NF, RO, or UF depending on goals) with intense vibratory shear to prevent fouling from brine solids and organics.
- Recycle clean permeate back to washing/cooling operations, reducing freshwater consumption.
- Concentrate brine for reduced disposal costs.
- Eliminate odor and reduce salinity discharge.
- Operate reliably despite high organics, which foul traditional membrane systems.
Outcome: Lower disposal costs, reduced regulatory risk, and a move toward closed‑loop water reuse.
2. Olive Oil Clarification & Free Fatty Acid Reduction
Process Description
Olive oil producers typically use horizontal centrifuges or decanters to separate oil from water and solids. Even with centrifugation, oils often contain:
- Free fatty acids (FFAs)
- Fine particulates
- Color bodies
- Colloidal impurities
These can reduce shelf life, clarity, aroma, and flavor stability.
Traditional Treatment Methods
| Method | Typical Practice | Limitations |
| Centrifugation Only | Standard for crude oil clarification. | Leaves behind colloids and small free fatty acid fractions. |
| Chemical Neutralization | Caustic treatments to remove FFAs. | Expensive, produces chemical waste, may affect flavor. |
| Settling Tanks | Passive settling before bottling. | Slow, inconsistent, and ineffective for the smallest contaminants. |
How VSEP Improves the Process
VSEP can process edible oils using membranes to remove impurities and specific molecular fractions such as FFAs—without damaging flavor compounds.
Advantages:
- Reduces free fatty acids, improving taste, smoke point, and shelf stability.
- Enhances clarity and polish of the final oil.
- Removes sub‑micron particles that centrifuges cannot.
- Eliminates or reduces the need for chemical neutralization.
- Recovers higher‑value premium oil fractions.
Outcome: A cleaner, higher‑quality olive oil with improved sensory characteristics and longer shelf life.
VSEP Filtered Olive Oil on the Left
In connection with the UC Davis Olive Center, testing was done to measure sensory and other characteristics of the filtered olive oil. The results showed that free fatty acids (FFA) are reduced in the filtered oil as shown below:
3. Olive Milling Wastewater (OMW) & Polyphenol Recovery
Process Description
In olive milling, water is added to aid separation of oil from solids. After centrifugation, the leftover olive mill wastewater (OMW) contains:
- Polyphenols (hydroxytyrosol, tyrosol, etc.)
- Sugars and organic acids
- Residual oil and suspended solids
- Deep color and strong odor
Polyphenols are highly valuable as nutraceuticals, cosmetic ingredients, antioxidants, and functional food additives.
Polyphenols Found in OMW
Traditional Treatment Methods
| Method | Practice | Drawbacks |
| Disposal as Wastewater | Discharge with minimal pretreatment. | High organic load, toxicity to soil microflora, and significant regulatory burden. |
| Evaporation | Thermal or passive evaporation. | Energy‑intensive, expensive, and destroys valuable polyphenols. |
| Chemical Precipitation | Remove solids for easier disposal. | Does not recover valuable compounds; generates chemical waste. |
How VSEP Enables Polyphenol Recovery
VSEP with NF membranes can separate OMW into:
- Polyphenol‑rich concentrate (high-value product)
- Clean permeate suitable for reuse or compliant discharge
Polyphenols Found in OMW – Segregated and Concentrated with VSEP
Advantages:
- Concentrates polyphenols for commercial extraction.
- Recover permeate for plant reuse, lowering water consumption.
- Handle high fouling loads without membrane plugging, thanks to VSEP vibratory shear.
- Reduce waste disposal volumes by 70–90%.
Outcome: Converts a disposal problem into a new revenue stream while reducing environmental impact.
Why VSEP Is Ideal for Olive Processing Applications
Technical Advantages
- High shear prevents fouling from oils, tannins, and organics.
- High flux rates even on viscous or heavily fouled streams.
- Modular, scalable systems for small processors or large mills.
- Compatible with UF, NF, and RO membranes.
- Allows direct filtration with minimal pretreatment.
- Reduced energy consumption compared to thermal technologies.
Business & Environmental Benefits
- Recover valuable byproducts like polyphenols and high‑quality oil.
- Reduce wastewater disposal volume and cost.
- Improve product quality and consistency.
- Enable water reuse and closed‑loop processing.
- Reduce regulatory burden from land application or discharge.
Pilot Testing and Performance Projections
New Logic offers pilot testing, including full‑scale demonstrations, to evaluate wastewater treatment performance for specific projects. In-house bench testing is also available. Pilot testing is required to validate full-scale system design and ensure accurate scale-up. Pilot testing is supervised by membrane engineers with decades of experience. Pilot testing allows:
- Verification of filtrate quality
- Measurement of flux, recovery, and fouling behavior
- Flux is normalized for temperature to ensure accurate projection scaling
- Accurate operating cost projections
- Optimization for reuse or ZLD configurations
Talk to a VSEP Filtration Expert
VSEP has decades of experience treating some of the most challenging industrial wastewaters in the world.
Contact us today to learn how VSEP can transform your treatment system.
- Request a Performance Projection: info@vsep.com
- Learn about Pilot Testing Options: https://www.vsep.com/technology/pilot-testing/
- Olive Oil VSEP Case Study: Olive Oil Clarification
- Table Olive Case Study: Table Olive Wastewater
- Learn More About the Technology: https://www.vsep.com/technology/
About VSEP and New Logic Research
- More than 450 industrial VSEP systems installed globally
- Technology covered by U.S. and international patents
- Used in mining, industrial wastewater, and many other applications
- Engineering team with chemical, metallurgical, and mechanical engineering backgrounds