In recent times, there has been growing concern over PFAS chemicals. PFAS – also known as per- and polyfluoroalkyl substances – have harmful effects on human health and the environment.
A review published in Current Opinion in Biotechnology sheds light on how bacteria might offer a solution. The new research shows certain bacteria can break down PFAS. Read all about PFAS bacteria treatment in today’s article.
Understanding PFAS and Their Impact
PFAS are a group of man-made chemicals used in a wide range of products. You can find PFAS in non-stick cookware, water-repellent fabrics, furniture, cosmetics, and more. They are known for their persistence in the environment, and in human bodies. As a result, you often hear them being referred to as “forever chemicals.”
Exposure to PFAS has been linked to serious health issues such as cancer, liver damage, and developmental problems in children. Unfortunately, traditional methods for removing PFAS, such as chemical treatments, often fall short. These methods either fail to fully degrade the chemicals or produce harmful byproducts. Therefore, developing new removal methods and regular PFAS testing are essential.
How Bacteria Can Break Down PFAS
Recent studies have shown that certain bacteria have the ability to break down PFAS. Pseudomonas bacteria have shown particular promise in PFAS bacteria treatment. Specific PFAS types, and the Pseudomonas strains that can break them down, are discussed below:
Perfluorooctanoic acid (PFOA)
Pseudomonas parafulva strain YAB-1 is one example of a bacterium that can break down PFOA. In lab studies, this bacterium managed to remove about 48% of PFOA within 96 hours. A modified version of this bacterium, known as F3–52, achieved even better results. F3-52 was able to remove 58.6% of PFOA and tolerated higher levels of the chemical.
PFOA removal has also been documented in systems with microbial consortia, or groups of different bacteria. For instance, bacteria from PFAS-contaminated river sediments managed to reduce PFOA levels by 16%. A microbial consortium that also comprised mold and yeast achieved 36% PFOA reduction.
Perfluorooctanesulfonic acid (PFOS)
Pseudomonas aeruginosa strain HJ4 has demonstrated the ability to remove 67% of PFOS. Another strain of Pseudomonas, Pseudomonas plecoglossicida, has also been successful in breaking down PFOS. In fact, this bacterium successfully reduced total PFOS by 75% in just 6 days.
Enzymes in Action
For bacteria to break down PFAS, they need special tools – enzymes. All living things have enzymes. These are proteins that help speed up chemical reactions. Some key bacterial enzymes for PFAS bacteria treatment include:
Laccase: Helps in the breakdown of PFAS but is still under study for its role in this process.
Lignin Peroxidase: Assists in degrading complex PFAS structures.
Fluoroacetate Dehalogenase: Breaks down PFAS by removing fluoride ions
Current Limitations and Future Directions
Lab research shows promising results for bacteria as a solution to PFAS contamination. But, there is still much to learn about how these bacteria work in real-world conditions. We need more research to understand how these methods perform in contaminated sites. We also need to study how these bacteria interact with other PFAS (aside from PFOA & PFOS).
Finally, we need to figure out how best to use these bacteria. Bacterial contamination of water itself is a problem. Using bacteria to tackle PFAS contamination in water may require further steps to then remove the bacteria afterward.
Conclusion for PFAS Bacteria Treatment
The potential for bacteria to break down forever chemicals is very exciting. It is a huge development in the fight against chemical pollution. These tiny organisms could offer a sustainable and eco-friendly solution for dealing with PFAS through PFAS bacteria treatment.
However, it’s also crucial to continue PFAS testing. Testing helps to identify pollution and prevent excessive harm. At Southern Scientific, our experienced specialists are skilled in various disciplines, including PFAS testing. Our state-of-the-art laboratories are fully equipped to provide accurate scientific results.
Test your water for PFAS today and make sure it’s safe to drink!
