Palm Oil Mill Wastewater (POME) Treatment and Zero‑Liquid Discharge Using VSEP
Direct POME Treatment Using VSEP RO Membrane
Palm oil mill effluent (POME) is a high‑strength wastewater with elevated COD/BOD, suspended solids, and tannin‑based color that resists biological degradation. Conventional membrane systems typically require clarification, dissolved air flotation, and ultrafiltration (UF) before reverse osmosis (RO) can operate. Biological systems have limitations as well and only treat water to throw it away.
VSEP eliminates these restrictions.
Vibratory Shear Enhanced Processing (VSEP) generates high membrane‑surface shear, preventing solids accumulation and enabling direct RO treatment of screened POME using only a coarse 100‑micron screen. In a single step, this produced clean RO permeate for reuse and concentrated nutrients for recovery.
Engineering Outcomes
A VSEP‑RO system provides:
- Direct treatment of high‑solids, high‑tannin POME
- RO‑quality permeate suitable for boiler feedwater
- Concentrate suitable for nutrient return to composting
- A compact ZLD process with fewer process units
This configuration reduces system complexity, lowers energy and chemical demand, and closes the water loop for mills seeking alternatives to surface discharge, ponds, or land application.
Palm Oil Milling and Wastewater Generation
Palm oil milling operates continuously, with fresh fruit bunches (FFB) processed within 24 hours of harvest. Key steps include:
- Steam sterilization of the fruit for ~90 minutes
- Threshing, where fruit is separated from the bunch
- Mechanical pressing to extract crude palm oil (CPO)
- Kernel recovery and crushing for palm kernel oil (PKO)
- Fiber and bunch processing for fuel or composting
While biomass is fully utilized, wastewater remains the primary environmental constraint.
POME Characteristics
For every ton of oil produced, approximately one ton of wastewater is generated. This wastewater contains:
- Extremely high organic loading (COD often 60,000–70,000 mg/L)
- High BOD
- Suspended solids
- High levels of tannins and color compounds
Tannins are particularly problematic due to their resistance to biological degradation and their toxicity to soil microbes used in agriculture.
Limitations of Conventional POME Treatment
Most mills use pond‑based biological treatment. While this reduces some loading, it has structural limitations:
- Color and tannins remain; effluent unsuitable for irrigation or discharge.
- Residual COD (400-500 mg/L) often exceeds many regulatory thresholds.
- Large land footprint for anaerobic and aerobic ponds.
- Certification risks: effluent quality challenges jeopardize sustainability compliance with major buyers.
Why Zero‑Liquid Discharge (ZLD) Is Becoming Essential
Sustainability auditing for palm oil mills now covers:
- Environmental impacts
- Water stewardship
- Energy use
- Land management
- Labor practices
Wastewater management remains the largest unresolved environmental challenge. A ZLD process eliminates discharge, closes the water loop, and supports certification requirements for continued access to global buyers who are increasingly prioritizing sustainability.
VSEP RO: A Technically Robust ZLD Solution for POME
Vibratory Shear Enhanced Processing (VSEP) provides a membrane‑based solution capable of handling the extremely high fouling potential of POME and composting leachate. This makes ZLD achievable without complex pretreatment.
How VSEP Works
VSEP applies torsional vibration to the membrane filter stack, creating high shear at the membrane surface. This allows the reverse osmosis (RO) membrane to filter the wastewater, producing clean RO permeate while minimizing fouling. Filtration of these liquids would rapidly plug conventional membrane systems.
Process Flow in Palm Oil Mill Applications
- POME or compost leachate is fed to the VSEP system after basic solids removal.
- VSEP RO modules concentrate the wastewater.
- VSEP RO permeate meets high‑purity requirements and is reused as boiler feedwater.
- VSEP concentrate is returned to the composting operation, where nutrients are recovered and incorporated into the soil amendment.
- Exothermic composting removes additional water from the compost
Technical Advantages
- Consistent flux on high‑solids, high‑tannin wastewater
- High rejection of organics, color, and dissolved solids
- Minimal pretreatment compared to conventional membrane systems
- Produces reusable water suitable for steam generation
- Returns nutrients to compost: no waste stream
- Achieves complete zero‑liquid discharge (ZLD)
Closed‑Loop Water Recycling for Palm Oil Mills
By integrating VSEP RO into the POME process, mills achieve a fully closed water cycle:
- No discharge to rivers or surface waters
- No land application of tannins that are toxic to soil microbiota
- No offsite wastewater transport
- Lower freshwater intake
- Enhanced compliance with sustainability audits
- Improved operational reliability independent of local discharge regulations
This approach resolves the last remaining sustainability barrier within palm oil production.
Case Study: Aceites Sustentables, Mexico
A palm oil company operating three mills in Guatemala and constructing a fourth in Mexico processes up to 60 tons of oil per hour. The VSEP system was deployed to support:
- ZLD operation
- Water recovery for boiler steam production
- Full nutrient recycling through composting
- Elimination of surface discharge
- Certification compliance for major international buyers
Jorge Medrano, the director of Aceites Sustentables contacted New Logic and said: “We have seen your technology working and would like to evaluate how applicable it could be for our industry. The environmental standards are becoming stricter and we are looking for a feasible technology that can ensure that we are in compliance with new standards. Our objective is to get zero waste and be in compliance with Mexican laws.”
The 2-module VSEP RO system was commissioned in 2017 taking screened POME wastewater. The system processes 14 m3/hr at 45ºC and 400 psi. The system operated at 50% recovery sending concentrate to a composting system where exothermic reactions evaporated more water.
VSEP Concentrate is Sprayed onto Compost for Nutrient Capture
The VSEP permeate was sent to boilers to make steam. Initially, a spiral RO system was planned to polish the VSEP permeate for boiler feed water quality, but this was not necessary since the permeate from the VSEP met the requirement without polishing. The VSEP produced clear permeate with no color or suspended solids and reduced COD from 8,000 mg/L to 30 mg/L.
Case Study: Agroforestal Uumbal Chiapas, Mexico
In 2018, New Logic commissioned a VSEP RO system in Southern Mexico to treat POME water from a storage lagoon. Prescreening was used to remove large solids and a spiral RO system was used to polish the VSEP permeate to make boiler feedwater. The concentrate was sprayed on compost piles.
The system operates at 35ºC and 75% recovery with a flux rate of 17 GFD.
Two-Stage VSEP RO System for POME
Storage Pond Feeding the VSEP System
Palm Oil Refining Wastewater – Another VSEP RO Application
The raw palm oil is shipped to refining facilities that use physical and chemical methods to purify the oil to make it into a food product.
1. In the degumming/washing step, water is used to remove water-soluble contaminants, generating wastewater.
a. In physical refining (washing/degumming), water is used to remove water soluble chlorides and solids. Water is then removed with centrifuges.
b. In chemical refining (Alkali neutralization/washing), phosphoric acid in solution is introduced to remove phospholipids; caustic soda to neutralize free fatty acids and citric acid to neutralize any excess soda. Two centrifugation steps yield water with small amounts of soaps and oil
2. In the bleaching step, bleaching earth is used to remove metals and pigments, steam is introduced multiple times in the process for heating and mixing. The steam is removed by a vacuum system and condensed into the bleaching hotwell.
3. In the deodorizing step, steam is introduced once again, under a greater vacuum and temperature. The steam is recovered in the Ice Condensing hotwell.
4. In the soapstock splitting step, sulfuric acid and steam are introduced to break the soap-like mixture from the chemical neutralization into acid oil and water. Acid water with low pH is a byproduct of this process.
All of these produce a strong wastewater that is mixed together and needs to be treated before discharge.
Case Study: Palm Oil Refinery, Spain
New Logic supplied demonstration VSEP equipment to accomplish two-stage filtration of mixed effluent from a palm oil refinery. The VSEP primary stage operated with 25 GFD at 300 psi and 25ºC and recovered 80% of the volume as clean RO filtrate. This was sent to a second stage spiral RO for polishing.
| Criterion | Raw Effluent | VSEP Permeate | Spiral Permeate |
| COD | 47,544 mg/L | 1,522 mg/L | 50 mg/L |
| Conductivity | 6,470 µS | 1,733 µS | 250 µS |
| Oil | 7,747 mg/L | 169 mg/L | 4 mg/L |
Palm Oil Refinery Samples – VSEP Permeate in the Center
VSEP Limitations & Design Considerations
- Recovery is limited by material rheology and viscosity
- Temperature typically limited to 90°C
- Prescreening may be required to remove solids >100 µm
Design note: Actual performance is stream‑specific. We pilot test to select membrane type, flux, recovery, and pretreatment options. Pilot Testing is required to confirm system design.
What VSEP® Pilot Testing Confirms
Pilot work is designed to gather all engineering, economic, and product‑quality information required for a full‑scale design. Pilot testing is supervised by New Logic engineers with 20+ years of experience. Key parameters include:
- Membrane selection (MWCO Cutoff, type of polymer)
- Flux Rates and recovery rate
- Fouling characteristics and shear response
- Turbidity, TSS, and haze removal
- Cleaning requirements (CIP optimization)
Pilot data is used to design a full production system by validating:
- Required membrane area
- Number of VSEP units
- Pump and motor sizing
- CIP system design
- Utilities (power, water, chemistries)
- Expected OPEX and ROI
Talk to a VSEP Filtration Expert
VSEP has decades of experience treating some of the most challenging applications in the world.
Contact us today to learn how VSEP can transform your treatment system.
- Request a No-Cost Performance Projection:info@vsep.com
- Learn about Pilot Testing Options: https://www.vsep.com/technology/pilot-testing/
- Learn More About the Technology:https://www.vsep.com/technology/
- Palm Oil Emulsion Article: Malaysia Palm Oil Emulsion
- Palm Oil Case Study: https://www.vsep.com/pdf/Palm_Oil_Case_Study.pdf
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
FAQ: Palm Oil Mill Wastewater (POME) Treatment, Membrane Filtration, and VSEP RO
What is POME and why is it difficult to treat?
Palm Oil Mill Effluent (POME) is a high‑strength wastewater with extremely high COD, BOD, suspended solids, oil and grease, and tannin‑based color. These compounds are resistant to biological treatment and overload conventional wastewater ponds.
How does VSEP RO treat POME without ultrafiltration (UF)?
VSEP uses vibratory shear to prevent fouling, allowing direct RO filtration of screened POME with only a 100‑micron screen. This eliminates the need for clarifiers, DAF systems, or UF membranes typically required for palm oil wastewater treatment.
Can VSEP achieve Zero‑Liquid‑Discharge (ZLD) for palm oil mills?
Yes. VSEP produces high‑purity RO permeate suitable for boiler feedwater and a nutrient‑rich concentrate that returns to composting, enabling a closed‑loop ZLD system for palm oil mills.
What are the benefits of VSEP RO for POME treatment?
VSEP RO reduces COD, color, and dissolved solids, lowers chemical usage, minimizes pretreatment infrastructure, decreases land footprint, and meets strict sustainability and discharge standards required by global palm oil buyers.
How does VSEP support sustainability certification?
By eliminating surface discharge, reducing freshwater demand, and enabling water reuse, VSEP helps mills comply with environmental, water‑stewardship, and RSPO‑aligned sustainability requirements.
Can VSEP treat palm oil refinery wastewater?
Yes. VSEP RO also treats degumming, bleaching, deodorizing, and soapstock splitting wastewater, making it suitable for refining effluents with high COD, oil, and dissolved solids.