Liquid Phase, PFAS/PFOA Organoclay

Hydrosil’s HS-PF is designed to remove per- and polyfluoroalkyl substances (PFAS). The media is selective for removing PFAS (PFOA, PFOS, FTCA, FTSA, FTOH). Based on the application, flow, concentration of the pollutants, granular activated carbon (GAC) or resin may be used to remove contaminates to non-detectable limits. Hydrosil’s HS-PF is an economical and efficient remediation process which removes both long and short chain perfluoroalkyl carbolic acids (PFCAs).

These emerging pollutants are commonly found in ground water from manufacturing facilities such as chemical, textiles, metal coating, automotive, as well as airports and air force bases.

Testing has shown that PFAS can be adsorbed into the inter-layer structure of the material for complete PFAS removal including PFOS and PFOA.

What is PFAS

Per- and poly-fluorinate alkyl substances are both known as “PFAS” or the “Forever Chemicals”. PFAS is grouped into polymers and non-polymers. Both of these are man-made chemicals have been manufactured for centuries in food packaging, stain repellents, textiles, fire-fighting foam, cleaning products, and military training equipment. PFAS chemicals are beginning to be phased out in the United States in order to eliminate the use of PFOA contamination. PFOA and PFOS is still be manufactured internationally and used in consumer products. Due to the unique molecular structure of PFAS—it is extremely difficult to break it down. Several water treatment processes are resistant to removing PFAS; Hydrosil’s HS-PF works to remove PFAS by means of ion exchange. Ion exchange is used to remove both short and long chain PFAS.

Health Effects of PFAS

Exposure to PFAS has shown several adverse health effects such as cancer, liver and kidney failure, decreased fertility, and thyroid disease.  These chemicals have difficulty breaking down in the environment as well as the human body and accumulate over time. PFAS is released to air, solid waste, and water waste which then get into drinking water, groundwater, rainwater, and surface water. Eventually the water is consumed by humans and living organisms where PFAS collects in the body over time.

PFAS Classification

PFAS is identified as chains of carbon and fluorine atoms with a carboxylic acid, alcohol, or sulfonic acid group. PFAS can be broken down into a number of subcategories as shown below.

 

HS-PF Pressure Drop

TYPICAL PHYSICAL PROPERTIES

Property:Value:
Apparent Density, lb/ft356-58
Specific Surface, sq. ft/g431
U.S. Standard Sieve Size (Mesh Size)14 x 40
pH Stable Range4-10
Thermally Stable, °F33-170
Mohs Scale4.0
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Common Applications:

  • Perfluorooctanoic Acid (PFOA)
  • Perfluorooctane Sulfonate (PFOA)
  • Perfluoroalkyl Sulfonic Acids and Sulfonates (PFSA)
  • Fluorotelomer Carboxylic Acids (FTCA)
  • Per- Polyfluoroalkyl Substances (PFAS)

Case Studies:

PFAS treatment at Air Force Base

PFAS/PFOA Limits

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