PFAS

Introduction/ Principles/ Regulation

PFAS (Per- and poly-fluoroalkyl substances) are a group of manufactured chemicals that have been widely used in industrial and consumer products since the 1950s. The properties of PFAS have resulted in many benefits, such as being highly resistant to heat, water and oil, which have resulted in many benefits. Therefore, they have been used for a wide variety of applications, including non-stick cookware, stain-resistant carpets, waterproof clothing and firefighting foam, to name just a few. However, these very properties/uses have resulted in widespread contamination within the environment. It was not until the late 1990s that the potential risks associated with PFAS exposure started to gain attention.

The unique chemical properties of PFAS make them very difficult to detect and measure in the environment. PFAS are highly resistant to degradation and can persist in the environment for decades, leading to accumulation and potential health risks for humans and wildlife. Another reason is that research on the health effects of PFAS exposure is still relatively new, and the full extent of the risks associated with exposure to PFAS can lead to a range of health problems, including cancer, thyroid disease, and immune system problems.

It has not been until recently that Regulatory bodies began to consider PFAS and start to develop guidelines and regulations, which have raised awareness of the issue and increased efforts to detect and manage PFAS contamination.

Investigation Techniques

Due to the increased awareness of PFAS, techniques used to identify its presence are being implemented, and VertaseFLI has developed a detailed investigation and sampling methodology, which generally includes the following steps:
 

Step 1 – Identify potential sources of PFAS. This process is often a desktop study and involves identifying sites that potentially used PFAS, such as industrial sites, airports, fire stations, landfills, etc.

Step 2 – Conduct a Site Investigation. VertaseFLI have developed a robust sampling methodology to prevent issues associated with cross-contamination. We have also developed site-specific PFAS suites based on historical land use. We can test the following matrices:

  • Soil
  • Groundwater
  • Concrete
  • Asphalt

Step 3 – Compare results to regulatory values to determine if remediation/intervention is required.

PFAS Remediation Methodologies

Remediating PFAS contamination is a very complex and challenging process, and there are very limited examples of it being completed in the UK. VertaseFLI have led the way on this and has undertaken numerous trials to determine the most suitable remediation approach, which includes:

  • PFAS Stabilisation/ Solidification bench trials
  • Groundwater PFAS barrier design investigations
  • Water Treatment System design

Possible remediation technologies include:

  • Stabilisation/ Solidification – Soils
  • Thermal Destruction – Soils
  • Granular Activated Cardon – Waters
  • Ion Exchange Resins – Waters
  • Reverse Osmosis – Waters
  • Advanced oxidation – Waters

It’s a personal and professional pleasure to work with Vertase, the people there are dedicated, knowledgeable and helpful in every way.

Lee Howard – GradIOSH & AIEMA
Group SHE Manager, Harron Homes

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