Learn which rules govern PFAS in landfill leachate, why conventional treatment lets PFAS through, where sorbent media fits in the train, and how column and pilot testing guide sizing before full scale.

Removing PFAS from landfill leachate takes its own treatment stage, one built to bind or destroy dissolved compounds. The equalization, biological treatment and filtration in a conventional leachate train were not designed to capture them.

That stage can be a sorbent held in vessels: granular activated carbon (GAC) or an engineered medium such as our Smart Sponge® Quanta™. It sits downstream of the existing processes and, for larger applications, can be sized from column and pilot tests on your own leachate. Federal PFAS limits for leachate have not been set yet, so build a first stage with room to add vessels once they are.

Which rules set PFAS limits on your leachate

The discharge pathway decides which requirement applies.

Direct discharge to surface water. You operate under an NPDES permit. Technology-based limits come from the Landfills Point Source Category effluent limitations guidelines (ELGs). The permit writer can add water-quality-based limits or PFAS monitoring on top of them. - Discharge to a POTW, by sewer or by truck. You fall under pretreatment. EPA has said federal pretreatment standards for leachate are warranted (see below). In the meantime, confirm with the POTW which local limits and industrial user permit conditions control what you can send. - Captive landfill at an industrial facility. If leachate is commingled with the plant's process wastewater, ask your permit writer whether the landfill guideline or the plant's own industry guideline governs it.

The current Landfills ELGs set no PFAS limits. In its Effluent Guidelines Program Plan 15 (January 2023), EPA said its study of the category was complete and that new effluent guidelines and pretreatment standards for leachate dischargers are justified. It intends to revise the category to address PFAS.

As of October 2026, no revised limits are in place. Check with your state NPDES authority or your POTW's pretreatment coordinator for any state PFAS monitoring or limits before you size equipment. Leave floor space and piping for additional vessels in series, because the eventual federal numbers may be tighter than whatever drives your first design.

Why equalization, biology and filtration let PFAS through

A conventional leachate train relies on equalization, biological treatment and multimedia filtration. Equalization evens out swings in flow and strength. Biology breaks down degradable organics and ammonia. Filtration removes suspended solids.

PFAS is dissolved, and its carbon-fluorine bonds resist biological breakdown, so the compounds pass through all three stages. Some precursor compounds can convert to terminal PFAS such as PFOA during biological treatment, which means effluent concentrations of those compounds can exceed influent.

Pulling dissolved PFAS out of the water requires contact with a sorbent engineered to bind it, or a step that destroys it. The same is true of runoff. If your landfill also discharges stormwater under a permit, see our article on how PFAS removal from stormwater works and how to choose an approach.

Where PFAS media sits in a leachate treatment train

Put PFAS sorption last, after solids, biological load, organic carbon and metals have been handled. Leachate carries heavy dissolved organic load, and that background organic carbon competes with PFAS for sorption sites. A PFAS sorbent that also has to take up organics and solids can reach breakthrough sooner and need changing more often. An organic carbon polishing stage ahead of the PFAS vessels, or in series within the same system, targets that load before it reaches the PFAS media. Our Smart Sponge® AC targets the organics that raise TOC. Where leachate also carries dissolved metals, Smart Sponge® HM handles them in their own stage. Smart Sponge® Quanta™ is our PFAS sorbent.

| Stage | What it handles | Role for PFAS | | --- | --- | --- | | Equalization | Flow and load swings | Not designed for PFAS | | Biological treatment | Degradable organics, ammonia | Not designed for PFAS; may convert precursors | | Multimedia filtration | Suspended solids | Passes dissolved PFAS | | TOC polishing | Dissolved and suspended organics that raise TOC | Reduces competing organic load ahead of PFAS sorption | | Metals polishing | Dissolved metals | Not a PFAS stage; included when leachate carries dissolved metals that must be met at discharge | | PFAS sorption (engineered media or GAC) | Dissolved PFAS | Dedicated PFAS capture | | On-site destruction (emerging) | Breaks PFAS down in place | No spent sorbent; still emerging for leachate |

The options below differ mostly in change-outs and what they leave behind. They are not the only approaches. Ion exchange resin is another sorbent option, and other separation or concentration steps may fit ahead of a sorbent polishing stage. Compare candidates on your own leachate during column and pilot testing.

GAC can treat leachate as part of a larger train. Carbon is used up as it loads, so you are committing to change-outs and to disposal or reactivation of spent carbon. - Quanta™ is formulated for PFAS and designed to bind the compounds without leaching them back into the environment. It is still a sorbent, so plan for handling spent media. - On-site destruction avoids a spent-sorbent stream. These technologies are newer; for many sites they are candidates to pilot alongside a sorption stage.

Vessel and skid formats for a leachate site

For a pumped leachate stream, Quanta™ would be held in vessels, tanks or skids that the stream passes through, with pilot testing used to confirm the fit. Passive formats such as catch basin inserts are built for runoff at an inlet and do not fit a pumped leachate stream. The media can be held three ways:

Your own vessels or tanks. If the plant already has pumping and spare tankage that is sound and correctly sized, loading bulk Smart Sponge® media into it is the least disruptive route. - Abtech vessels. Where existing tankage is committed elsewhere or undersized, we supply our own vessels. - Smart Skid. A skid-mounted package with its own pumps plus flow and pressure controls. It needs a power connection and suits a site that wants a self-contained stage on a defined footprint.

When AC, HM and Quanta™ are all needed, give each medium its own vessel in series so each can be changed out on its own schedule. For the polishing end of the train more broadly, see wastewater polishing for discharge and reuse limits.

How do you test PFAS media on your own leachate before committing?

Every project starts with a site assessment covering:

the PFAS compounds and co-contaminants in your leachate - typical and peak flows - available space - the effluent target you have to meet - maintenance access for change-outs

Leachate chemistry varies from one landfill to the next and between cells at the same site, so a configuration that works on one matrix may behave differently on yours.

For larger applications, laboratory column testing can follow, on a sample drawn from your site. The column shows when PFAS starts breaking through the media under your leachate's organic load and hardness, and that breakthrough point informs media volume, vessel count and change-out frequency. One decision rule: if post-biology TOC in your analyticals is high, run one column with an organic carbon pre-stage ahead of the PFAS media and one without. Then compare when each reaches breakthrough before you decide whether the pre-stage earns its vessel. Pilot testing can then run real leachate through the configuration on site before you commit to full scale. Our page on PFAS removal media for water treatment explains how Quanta™ is tested and how it pairs with our metals and bacteria media.

To scope column testing, contact Abtech to schedule a site assessment. Have your recent leachate analyticals, flow records and current permit or pretreatment requirements on hand.

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Sources

Landfills Effluent Guidelines | US EPA

How Do You Add PFAS Removal to a Landfill Leachate Train?