No single approach fits every site, but landfills that evaluate PFAS technologies within a broader framework will be better prepared for the expectations of the coming decade.
By Rick Gillespie
Landfill operators are managing an increasingly complex regulatory environment, and PFAS is at the center of that shift. While most landfill discharge permits do not yet contain PFAS limits, the industry is seeing rapid movement from federal agencies, state regulators, and publicly owned treatment works (POTWs). In several cases, POTWs have informed landfills that they can no longer accept leachate due to PFAS concentrations. These notices typically arrive with little warning, leaving operators with few immediate alternatives and forcing them into costly interim responses, such as hauling raw leachate or emergency staging.
The result is a growing recognition that PFAS management must be addressed in a more deliberate way. Operators are now evaluating technologies well before requirements become mandatory. The objective is not only regulatory compliance, but also operational continuity and long-term liability control. As more data is generated and more real-world performance information becomes available, a clearer technical and commercial picture is emerging of what a sustainable PFAS management program should look like.
Understanding the PFAS Challenge in Leachate
PFAS are persistent chemicals present in a wide range of consumer and industrial materials. They enter the municipal waste stream through carpet, textiles, packaging, and industrial process wastes and, ultimately, appear in landfill leachate. Concentrations vary significantly across sites, but the key issue is not the absolute concentration; it is the combination of persistence, mobility, and the very low levels at which regulators now expect PFAS to be controlled.
Federal drinking water standards are now in place, and several states have adopted parts-per-trillion limits for treated effluent. Even in states without formal limits, POTWs are tightening acceptance policies, often citing community pressure, downstream discharge obligations, and concerns around future CERCLA liability. These pressures frequently converge well before a formal regulatory deadline, which is why the industry has seen unexpected and immediate restrictions on leachate acceptance.
For landfill operators, this dynamic creates a narrow runway for response. The question is no longer whether PFAS limits will tighten, but whether the facility has a plan in place before a discharge partner forces the issue. That is what is driving the current wave of interest in PFAS management technologies.
Current Treatment Approaches and Their Practical Limitations
Landfills have access to several categories of PFAS treatment technologies. Each has a role, but each also carries performance constraints that must be understood when selecting a long-term approach.
Legacy Removal Technologies
Granular activated carbon, ion exchange, and reverse osmosis have been the default tools for initial PFAS control. They reduce PFAS concentrations, are broadly understood by regulators, and can be implemented relatively quickly. Their drawback is structural: they do not destroy PFAS. Instead, they transfer PFAS into spent carbon, resin, or RO reject. These residual streams carry the same long-term liability and must be managed or disposed of at additional cost. They can serve as interim measures or polishing steps, but do not resolve the problem at its source.
Pilot and Treatability Programs
Because leachate varies substantially in salinity, organic loading, metals, and color, many sites now conduct pilot evaluations across multiple technologies. Foam fractionation, RO, ion exchange, and media-based systems each respond differently depending on leachat chemistry. Pilot testing has become a standard practice because it produces defensible data that can inform long-term capital decisions and clarifies which technologies are compatible with operations at that specific site.
Destruction Technologies
Multiple destruction methods are under evaluation, including non-thermal plasma, electrochemical oxidation, photocatalytic systems, and supercritical water oxidation (SCWO). Their performances vary depending on leachate chemistry and on the degree of concentration achieved upstream. Technologies that rely on light energy or electrochemical contact often lose efficiency in the presence of color, high dissolved solids, or elevated COD. This is why many destruction technologies perform well in laboratory conditions but encounter challenges when applied directly to raw leachate.
SCWO has demonstrated higher operational consistency because it creates uniform reaction conditions that do not rely on optical transparency or electrical conductivity. When PFAS is delivered to SCWO as a concentrated stream, destruction efficiencies exceed 99.99 percent, and the outputs are limited to water, carbon dioxide, and inorganic salts. SCWO is not the only destruction pathway under development, but it is the one that has shown the most consistent performance across a range of real landfill leachate concentrates.
A Practical Strategy: Separation, Concentration, And Destruction
A sustainable PFAS program increasingly relies on a treatment train rather than a single technology. Although each landfill will tailor this framework to its own leachate characteristics, the technical structure is similar across sites.
Separating PFAS from the Main Leachate Flow
The first objective is to remove PFAS from the entire leachate volume. Foam fractionation has emerged as a primary tool for this step. PFAS compounds naturally accumulate at the air-water interface, allowing the system to remove a significant portion of the PFAS mass with limited energy input. Foam fractionation performs well across variable leachate conditions. It is effective at capturing long-chain PFAS and is showing improved performance on targeted short-chain species.
Reverse osmosis and ion exchange can provide additional removal where extremely low effluent concentrations are required. They are more operationally intensive and generate PFAS-bearing residuals, but serve an important role when the discharge endpoint demands tighter polishing.
Reducing the PFAS Containing Volume
Once PFAS is separated from the bulk liquid, the remaining PFAS-containing material must be reduced to a manageable volume. Foam fractionation produces a foamate stream that is significantly smaller than the original leachate flow. RO generates a reject stream, and ion exchange produces regenerant or spent media requiring further management. Concentration is a critical economic step because destruction costs scale directly with mass and volume, not with influent flow.
Achieving Permanent PFAS Removal
The final step is the destruction of PFAS. SCWO has shown consistent performance for concentrated PFAS streams because it operates at elevated temperature and pressure conditions that promote complete oxidation. Other destruction technologies continue to evolve, but currently exhibit greater sensitivity to the complex chemistry of landfill leachate.
The advantage of a separation-concentration-destruction framework is its flexibility. Landfills can scale systems incrementally, incorporate multiple technologies, and adjust the treatment train as regulatory expectations change.
Key Considerations When Evaluating PFAS Solutions
When selecting a PFAS pathway, operators should evaluate several dimensions:
- Regulatory alignment: Can the system meet current and anticipated parts per trillion requirements, and will any residuals become regulated wastes in the future?
- Operational fit: How well does the approach tolerate seasonal variation, salinity, metals, and organics? Does it require specialized labor or complex maintenance?
- Financial performance: What are the long-term operations and maintenance costs, and how predictable are they? How does the approach manage risk associated with residual disposal?
- Liability management: Does the technology eliminate PFAS or simply relocate it? Is destruction independently validated?
A strong PFAS program balances all four dimensions rather than optimizing for one at the expense of the others.
A Structured Approach
PFAS management is transitioning from an emerging concern to a core operational responsibility for landfills. The timing of regulatory changes may vary by state, but decisions by POTWs and downstream treatment partners continue to compress reaction time. A structured approach built on separation, concentration, and destruction positions landfill operators to respond effectively to changing conditions.
Foam fractionation and SCWO are proving to be important components of this model because they provide technical reliability, operational practicality, and a defensible long-term liability posture. No single approach fits every site, but landfills that evaluate these technologies within a broader framework will be better prepared for the expectations of the coming decade. | WA
Rick Gillespie serves as the Chief Commercial Officer for Revive Environmental, where he leads commercial strategy and partnership development across federal, municipal, and private sectors. With more than 25 years of experience in environmental remediation, Rick has focused on deploying innovative technologies to address contaminants in landfill leachate, industrial wastewater, AFFF fire-fighting foams, and PFAS-impacted groundwater. He has collaborated with engineering firms, regulatory agencies, private industry, and the Department of Defense to deliver successful remediation programs. Rick has also served as a national trainer for the Interstate Technology & Regulatory Council (ITRC) and co-authored numerous publications and presentations on emerging contaminant treatment. Rick can be reached at [email protected].