PFAS in Wastewater: Why Traditional Treatment Methods Fall Short and What Works Better

Australia’s wastewater sector faces increasing challenges from persistent pollutants such as per- and polyfluoroalkyl substances (PFAS). Often referred to as “forever chemicals” due to their resistance to natural degradation, PFAS represent one of the most critical issues in wastewater management today. Regulatory agencies are now tightening standards to safeguard public health and the environment.

Reflecting the urgency of the issue, Australia’s Industrial Chemicals Environmental Management Standard (IChEMS) has now implemented restrictions on several key PFAS chemicals, which came into effect on 1 July 2025. The ban covers widely used compounds such as Perfluorooctanoic Acid (PFOA), Perfluorohexanesulfonic Acid (PFHxS), and Perfluorooctanesulfonic Acid (PFOS).

Traditional wastewater treatment processes, once effective for a range of contaminants, are unable to deal with the resilience of PFAS. This article explores why conventional systems fall short and how modern solutions are emerging as the way forward.

Understanding PFAS and Their Impact

PFAS are a large group of synthetic chemicals first developed in the 1940s and used extensively in industries for their water, grease, and stain-resistant properties. Common applications have included textiles, non-stick cookware, food packaging, and metal plating.

The challenge lies in their persistence: PFAS do not readily degrade in nature, allowing them to accumulate in the environment and living organisms. This persistence is linked to significant health risks, including cancers, thyroid disorders, and developmental impacts.

Why Traditional Wastewater Processes Fail in PFAS Removal

Conventional wastewater treatment methods such as activated sludge systems, sand or carbon filtration, and coagulation/flocculation are effective at removing organic pollutants, pathogens, and suspended solids. However, they are largely ineffective against PFAS.

The chemical stability and low degradability of PFAS mean they pass through these systems largely intact, persisting in effluent and bio-solids, and creating ongoing risks for both the environment and human health.

Modern Solutions for PFAS Removal

To meet evolving regulatory requirements, treatment providers are increasingly adopting advanced PFAS control technologies:

• Advanced Activated Carbon and Ion Exchange – Engineered carbons and resins with enhanced adsorption capacity, targeting long-chain PFAS compounds.

• Membrane Filtration – Nanofiltration and reverse osmosis systems physically separate PFAS from water with high efficiency.

• Advanced Destruction Technologies – While standard AOPs are ineffective, newer, more energy-intensive processes like electrochemical oxidation or plasma treatment are capable of breaking the strong chemical bonds of PFAS molecules.

• Sustainably produced activated carbon, such as Bygen’s LTA carbons, provides optimised adsorption for PFAS capture. It can be paired with ion exchange or destruction technologies, but it does not destroy PFAS on its own

PFAS Destruction Strategies

Beyond removal, growing attention is being placed on destroying PFAS at the molecular level. New methods include:

• Biotechnology-driven approaches, which aim to degrade PFAS in a cost-effective, environmentally responsible manner.

These innovations hold strong potential to reduce both operational costs and long-term environmental impacts.

Choosing the Right PFAS Treatment Strategy

Australia’s PFAS National Environmental Management Plan (NEMP 3.0) provides the guiding framework, referencing the Australian Drinking Water Guidelines, which set a health-based value for the sum of PFOS and PFHxS at 0.07 µg/L.

Modern solutions such as Granular Activated Carbon (GAC) adsorption have demonstrated effectiveness in capturing long-chain PFAS while offering cost advantages. Selecting the right strategy often requires balancing regulatory compliance, technical feasibility, and sustainability objectives.

Conclusion

PFAS contamination has exposed the limitations of conventional wastewater treatment methods and accelerated the adoption of modern, sustainable alternatives. With regulations in full effect and a suite of proven technologies available, from advanced activated carbon and ion exchange to PFAS-targeted destruction methods, implementing a future-ready strategy is essential for compliance and environmental protection.