What Are PFAS “Forever Chemicals,” and Can They Actually Be Destroyed?

For decades, a class of synthetic chemicals called PFAS has worked its way into carpets, food packaging, firefighting foam and even human blood. Scientists call them per- and polyfluoroalkyl substances. Most people know them by a blunter nickname, forever chemicals. That name comes from the simple chemistry fact that PFAS molecules contain some of the strongest bonds in organic chemistry. Until recently, almost nothing could break them apart. 

Now that assumption is being tested. A wave of new technologies claims to destroy PFAS rather than simply move them from one place to another. The question now is how quickly these methods can scale up to match the size of the problem.

The Chemistry Behind the Name

PFAS get their staying power from the carbon-fluorine bond, which is one of the strongest single bonds found in nature. Manufacturers have used that strength for decades to make products resistant to water, grease, heat and stains. Nonstick pans, waterproof jackets, food wrappers and industrial coatings all rely on the same underlying trait. 

That trait becomes a liability once these chemicals reach the soil or the human body. Because the carbon-fluorine bond is resistant to the natural breakdown processes that degrade most organic compounds, PFAS molecules persist for years. They accumulate in the environment and in living tissue. Their extremely stable carbon-fluorine bonds make PFAS useful in industry, yet, incredibly difficult to eliminate once released into the environment.

Health researchers have linked exposure to certain PFAS compounds to a range of concerns. These include effects on the liver, immune system and reproductive health. That growing body of evidence has pushed regulators worldwide to tighten their approach. This is especially valuable considering that the lack of access to clean water is a top public health concern.  

Why Filtering Isn’t Enough

For years, the standard response to PFAS contamination was containment. Water treatment plants and cleanup sites relied on filters such as granular activated carbon or ion-exchange resins to trap PFAS molecules. These methods work well at capturing the chemicals. They do nothing to eliminate them.

Capturing PFAS in filters or adsorbents only transfers the problem, since these methods don’t break the chemical down. The result is a growing stockpile of PFAS-laden filters and sludge that still needs to go somewhere. Landfilling that waste risks future leaching back into groundwater. Incineration, once viewed as a disposal solution, has drawn scrutiny, since incomplete combustion can release PFAS fragments into the air. This has prompted research into more effective destruction technologies. That shift has opened the door to a new generation of engineering approaches built specifically to break the carbon-fluorine bond.

The Technologies Doing the Breaking

Several destruction methods have moved from laboratory curiosities to real deployments in recent years.

Supercritical water oxidation heats water above its critical point. At this stage, it exhibits chemical properties distinct from those of liquid water or steam. At that stage, high temperature and high pressure enable an oxidation reaction that breaks the carbon-fluorine bond. One company built on this approach, Revive Environmental, spun out of the research nonprofit Battelle. 

Its reactor system, called the PFAS Annihilator, pumps PFAS-contaminated water through a series of pipes and heat exchangers to trigger the reaction. Battelle has described the technology as the first commercially available process proven to destroy forever chemicals without harmful byproducts, and it has already been deployed to treat landfill leachate in North America.

Electrochemical oxidation offers another path, using an electrical current to drive the same kind of bond-breaking reaction without the extreme heat required by supercritical methods.

Hydrothermal treatments have also gained traction. At Worcester Polytechnic Institute, researchers have developed a process called Radical-Initiated Hydrothermal Liquefaction. The technology uses heat, pressure and nontoxic chemicals to break the strong carbon-fluorine bonds that make PFAS so difficult to destroy. 

Early laboratory tests of the process have destroyed more than 99% of PFAS across several forms of contamination, including firefighting foam residue. The project recently received federal funding to move the technology closer to real-world use, with an added twist. Researchers hope to pair the process with plants capable of absorbing PFAS from contaminated soil, thereby turning polluted biomass into usable fuel.

Sound and light-based methods round out the field. Sonolysis uses intense sound waves to create tiny collapsing vapor bubbles in contaminated water. As these bubbles collapse, they generate intense, localized heat and pressure that can break tough chemical bonds, such as those found in PFAS. Photochemical destruction takes a gentler route, using ultraviolet or visible light paired with catalysts to break the same bonds, though this method remains further from commercial readiness.

Researchers in Germany have recently pursued two more approaches in tandem. One method uses collapsing vapor bubbles to generate extreme heat and reactive molecules, while the other uses cold plasma and rising gas bubbles to pull PFAS to the surface and break them apart. If the combined approach proves successful, it could lead to a more efficient technology for destroying PFAS in contaminated water before the chemicals spread further into the environment.

From Lab Bench to Real World

Destroying PFAS in a controlled laboratory setting is one milestone. Doing it at the scale of a municipal water system or a contaminated military base is another. Most of these technologies still face real hurdles around cost, energy use and throughput. Supercritical water oxidation requires significant energy to reach and maintain the necessary temperature and pressure. Hydrothermal and electrochemical methods face similar trade-offs among speed, cost and the completeness of destruction.

Start-ups are now working to supply new technologies capable of breaking the carbon-fluorine bond, competing to bring destruction methods to a commercial scale. That competition is pushing costs down and performance up, a pattern common to emerging environmental technologies once the underlying science is proven.

Regulation is accelerating the shift as well. As disposal rules tighten and liability grows for companies holding PFAS waste, containment alone looks increasingly like a temporary fix rather than a real solution. 

A Name That May Not Fit Forever

The nickname “forever chemicals” captured something true about PFAS for most of their history. The carbon-fluorine bond really did resist virtually everything scientists threw at it, for decades. That is no longer the whole story. Supercritical water, electrochemical currents, hydrothermal reactions, collapsing sound bubbles and cold plasma have each shown they can break bonds once thought unbreakable.

The core chemistry question has been answered. PFAS can be destroyed. What remains is an engineering and economic challenge, not a fundamental impossibility. For a class of chemicals defined by permanence, that shift alone marks significant progress.