Landfill Leachate Treatment

Landfill Leachate Treatment Using VSEP^® Reverse Osmosis (RO) Membrane Technology

Landfill leachate treatment with VSEP® uses high‑shear reverse osmosis membranes to remove dissolved solids, refractory organics, ammonia, metals, and PFAS from high‑strength landfill leachate, producing high‑quality treated water suitable for discharge or reuse, subject to permit requirements.

Landfill leachate treatment is one of the most challenging wastewater applications due to high concentrations of dissolved solids, refractory organics, ammonia, heavy metals, and PFAS. Conventional biological and membrane systems often struggle with fouling, instability, and inconsistent performance—especially as landfills age.

VSEP® (Vibratory Shear Enhanced Process) is an advanced reverse osmosis membrane system developed by New Logic Research that is specifically engineered to treat high‑strength landfill leachate. By generating intense shear directly at the membrane surface, VSEP® minimizes fouling, maintains stable flux, and delivers consistent high‑quality effluent where conventional RO systems fail.

Why is Landfill Leachate Difficult to Treat?

Landfill leachate is difficult to treat because its composition changes over time and typically contains high salinity, refractory organics, ammonia, metals, and emerging contaminants such as PFAS.

Landfill leachate varies widely depending on:

• Landfill age (young vs. mature leachate)
• Waste composition
• Rainfall and climate
• Operational practices and liner systems

As landfills mature, leachate typically contains:

• High COD with low biodegradability
• Elevated ammonia concentrations
• High TDS and salinity
• Metals and emerging contaminants such as PFAS

Many landfill operators send leachate to POTWs; however, conventional municipal treatment systems are not specifically designed to remove dissolved solids or PFAS, which may not be fully addressed by standard biological treatment processes.

Overview of Landfill Leachate Treatment Technologies

Multiple technologies are used for landfill leachate treatment, often in combination. Each has advantages and limitations.

Biological Treatment

Biological systems are commonly used for young leachate with high BOD.

Benefits	Limitations
Frequently used and understood	Poor performance w/ recalcitrant COD
Effective for biodegradable organics	Poor PFAS removal
	Inhibited by ammonia, salinity, metals
	Large footprint

 

Biological treatment is most effective for young landfill leachate with high biodegradability but is limited for mature leachate and PFAS removal.

Conventional Spiral Reverse Osmosis (RO)

Spiral‑wound RO membranes can remove dissolved contaminants when sufficient pretreatment is provided.

Benefits	Limitations
Produces high quality filtrate	Requires significant pretreatment
Broad removal of contaminants	Subject to fouling
Excellent PFAS removal	Large reject volume remains
Often meets discharge requirements	Significant chemical use

Thermal Evaporation / MVR

Thermal systems evaporate water and concentrate contaminants.

Benefits	Limitations
Maximum volume reduction	Very high energy demand
Handles extreme salinity	Scaling and corrosion
	May require softening

Why is VSEP® RO Different?

VSEP® is different from conventional reverse osmosis systems because it applies high shear directly at the membrane surface, preventing fouling and allowing stable treatment of high‑strength landfill leachate without extensive pretreatment.

Conventional spiral RO relies on crossflow velocity to limit fouling. In practice, shear at the membrane surface decays to near zero due to narrow feed spacers, allowing rapid fouling and scaling particularly in landfill leachate applications with high organic loading, suspended solids, and scaling species.

Unlike disc‑tube and ultra‑high‑pressure RO systems that rely on extreme pressure and chemical pretreatment, VSEP® controls fouling through mechanical shear at the membrane surface.

Can RO remove PFAS from landfill leachate?

Yes. Reverse osmosis membranes provide a physical barrier that effectively removes both short‑ and long‑chain PFAS compounds from landfill leachate, making RO one of the most effective methods for PFAS removal from landfill leachate.

Why Not GAC or IX for PFAS?

Granular activated carbon and ion exchange can remove some PFAS but are quickly exhausted in landfill leachate due to high organics and competing ions; reverse osmosis provides broader and more predictable PFAS removal.

Key advantages of VSEP® for landfill leachate treatment:

• Minimal fouling without pretreatment
• Stable flux on high TSS, COD, and viscosity
• Compact footprint
• Fewer unit operations
• Reliable long‑term operation

VSEP® Performance for Landfill Leachate

VSEP® reverse osmosis membranes provide broad contaminant removal for landfill leachate treatment by physically rejecting dissolved and particulate constituents.

Typical removal performance:

• COD: >90–99%
• Ammonia: >95–99%
• TDS / salinity: >95–99%
• Heavy metals: >95–99%
• PFAS (short‑ and long‑chain): rejected to below typical laboratory detection limits in demonstrated applications

In many landfill leachate applications, VSEP® requires only coarse screening greater than 100 microns, with final pretreatment requirements confirmed through site‑specific pilot testing.

How Does VSEP® Treat Landfill Leachate?

VSEP® treats landfill leachate using reverse osmosis membranes that physically reject dissolved and particulate contaminants. High shear at the membrane surface prevents fouling and allows consistent treatment of difficult leachate streams.

Typical VSEP® Landfill Leachate Treatment Configurations

Most modern systems use hybrid treatment trains:

• Biological → VSEP® RO → Thermal
• VSEP® RO → Thermal (concentrate minimization or ZLD)
• VSEP® RO → Leachate recirculation (where permitted)

Why Use RO Instead of Biological Treatment for Leachate?

Reverse osmosis is often required for landfill leachate treatment because biological systems do not effectively remove dissolved solids, refractory organics, or PFAS. RO provides a physical separation barrier independent of biodegradability.

Reducing Leachate Levels and Storage Requirements

A lined landfill functions like a bathtub retaining water. Rainfall and waste decomposition continuously add moisture, while regulations require leachate levels to remain below a maximum head above the liner.

VSEP® systems can be designed to remove more water than enters the landfill, allowing operators to:

• Reduce or eliminate leachate ponds
• Lower liner risk
• Reduce hauling and disposal costs

In many cases, VSEP® concentrate is returned to the landfill. Where regulations prohibit recirculation, thermal systems can further reduce the concentrate to dry solids.

Proven Landfill Leachate Applications

New Logic Research has installed 15 full‑scale VSEP® landfill leachate systems worldwide, treating leachate with TDS up to 65,000 mg/L and COD up to 17,500 mg/L.

Case Study: Bordo Poniente Landfill – Mexico City

The Bordo Poniente landfill is the second‑largest landfill in the world by area. In 2008, New Logic installed a demonstration VSEP® RO system that recovered 50% of the leachate volume as clean water, significantly reducing storage requirements.

Case Study: El Inga Landfill – Quito, Ecuador

A VSEP® system treating 55 gpm (300 m³/day) achieved 75% recovery. A polishing RO stage reduced ammonia and COD to <10 mg/L, meeting strict discharge limits.

Case Study: Yotoco Landfill – Colombia

A three‑module VSEP® RO system treats 26 gpm (150 m³/day) of leachate and recovers 80% of the volume as reusable water.

VSEP® Design Considerations

• Recovery limited by osmotic pressure and viscosity
• Performance is site‑specific
• Throughput depends on temperature
• Prescreening >100 microns required
• Not compatible with strong oxidizers or aromatic solvents

Design note: Actual performance is site‑specific. We pilot test to select membrane type, flux, recovery, and pretreatment options. Chemistry varies for each landfill. Final system sizing, membrane selection, and performance projections are only provided after pilot testing validation.

VSEP® systems are designed to support NPDES discharge, sewer discharge, and reuse permits, subject to site‑specific regulatory approval.

Request a No‑Cost VSEP® Leachate Assessment

With decades of experience treating some of the most challenging industrial wastewaters, VSEP® provides proven landfill leachate treatment solutions.

Your assessment includes:

• Contaminant characterization (COD, ammonia, metals, TDS, PFAS)
• Pilot testing options using your actual leachate
• Treatment configuration and implementation roadmap
• CAPEX and OPEX estimates

Talk to a landfill leachate treatment expert today.

+1‑775‑783‑7600
info@vsep.com
Pilot Testing: https://www.vsep.com/technology/pilot-testing/
VSEP® Technology: https://www.vsep.com/technology/

---

Landfill Leachate Treatment FAQs

Is reverse osmosis effective for mature landfill leachate?

Yes. Reverse osmosis is one of the most effective treatment methods for mature landfill leachate because it removes dissolved salts, refractory organics, ammonia, and PFAS that are poorly treated by biological systems.

How is landfill leachate treated with VSEP®?

VSEP® treats landfill leachate using high‑shear reverse osmosis membranes that remove dissolved solids, organics, ammonia, metals, and PFAS. It is designed for high‑strength leachate where conventional biological and membrane systems struggle.

Why is landfill leachate difficult to treat?

Landfill leachate changes over time and often contains high levels of salts, ammonia, hard‑to‑degrade organics, and emerging contaminants like PFAS. These characteristics make treatment challenging for conventional biological and membrane systems.

How is VSEP® different from conventional RO?

Traditional RO systems foul quickly when treating landfill leachate. VSEP® uses vibration to keep the membrane surface clean, allowing stable operation on high‑strength leachate with minimal pretreatment.

Can VSEP® remove PFAS from landfill leachate?

Yes. Reverse osmosis membranes provide a physical barrier that effectively removes both short‑ and long‑chain PFAS compounds from landfill leachate.

What happens to the treated water?

VSEP® produces high‑quality permeate that can be:

• Discharged to surface water (where permitted)
• Sent to sewer
• Reused on‑site for applications such as dust control

What happens to the concentrated waste?

The concentrated contaminants are managed according to site regulations. Options include recirculation back into the landfill or further treatment using evaporation systems.

Is VSEP® a proven technology?

Yes. VSEP® systems have been installed at landfill sites worldwide, including some of the largest landfills, treating leachate with very high salinity and organic loading.