Removing PFAS from water is only half the challenge — they must also be destroyed, not just transferred to another waste stream.
Active areas of research include:
1) Plasma Treatment
High-voltage plasma breaks C–F bonds.
- Works well for concentrated PFAS waste
- Energy-intensive
- Not yet used at large municipal scale
2) Electrochemical Oxidation
Using electrical current and special electrodes to degrade PFAS.
- Promising laboratory results
- Issues with electrode durability
- Potential byproduct formation
3) Advanced Photocatalysis
Using UV light + catalysts to break PFAS bonds.
- Low efficiency today
- Needs powerful light sources
- Major research focus at many universities
4) Supercritical Water Oxidation (SCWO)
Destroys PFAS at extremely high pressure and temperature.
- Technically effective
- Very expensive
- Requires specialized reactors
5) Biological Treatment (Early Stage)
Scientists are searching for bacteria or enzymes capable of degrading PFAS.
- Currently slow and limited
- Exciting future potential
| Technology Category | Technology | Challenges | Research Needs |
| Field Implemented | Granular Activated Carbon (GAC) | Competitive adsorption with other contaminants including unidentified PFAS; pretreatment often required; faster breakthrough for short-chain PFAS; less economical at high influent concentrations; spent GAC requires regeneration or incineration and may release PFAS. | More comprehensive performance data; adsorption capacity for short-chain PFAS; understanding competition with other contaminants and aqueous species. |
| Ion Exchange (IX) | Competitive adsorption with ions including unidentified PFAS; pretreatment required; short-chain PFAS breakthrough faster; higher media cost; removal efficiencies vary by PFAS; regeneration produces concentrated brine needing treatment; incineration costly and may release PFAS. | Similar needs as GAC; improved cost-benefit analysis for single-use, regenerable, and hybrid IX systems. | |
| Reverse Osmosis (RO) | Membrane fouling; pretreatment required; multi-stage systems needed; membrane cleaning/replacement essential; produces high-volume concentrate requiring disposal; performance affected by temperature; product water may require post-treatment to prevent corrosion; higher cost than GAC/IX. | Further development of membrane technologies; evaluation of removal across a wide range of PFAS and water qualities; cost-effective disposal/treatment options for concentrate streams. | |
| Nanofiltration (NF) | Lower rejection performance than RO; similar fouling and pretreatment challenges as RO. | Assess whether NF advantages can be realized alone or with other systems; similar research needs as RO. | |
| Novel Technologies | Novel Adsorbents (e.g., biochar) | Material performance varies widely; some have limited PFAS adsorption capacity. | Develop more effective and lower-cost adsorbents for PFAS removal. |
| Advanced Oxidation Processes (AOPs) | PFAS are highly resistant to oxidation; may generate unknown or harmful byproducts; limited effectiveness. | Develop oxidation pathways capable of breaking strong C–F bonds; evaluate byproduct formation and toxicity. | |
| Plasma-based Treatment | High energy consumption; scalability challenges; equipment cost. | Increase energy efficiency; optimize reaction conditions and engineering for scale-up. | |
| Electrochemical Oxidation | Electrode stability issues; potential formation of fluorinated byproducts; variable efficiency. | Develop more durable electrode materials; characterize degradation mechanisms and byproducts. | |
| Photocatalysis | Low PFAS reactivity; requires intense light sources; low overall efficiency. | Develop photocatalysts capable of effectively degrading PFAS. | |
| Thermal Treatment | Very high energy demand; incomplete mineralization under some conditions; potential release of intermediates. | Determine specific temperature and residence time needed for complete PFAS mineralization; establish best operational conditions. | |
| Biological Treatment | PFAS are highly resistant to biodegradation; current microbial effectiveness low. | Identify microorganisms or enzymes capable of PFAS transformation or degradation. |