Why is PFAS different from other types of contamination?
The chemical properties of PFAS make it highly mobile in water and resistant to degradation and oxidation.
PFAS chemistry is complicated and mixtures can be complex, requiring careful consideration when evaluating treatment options.
Destruction and oxidation techniques are not recommended for discharge purposes, due to uncertainties relating to toxic byproduct formation.
Currently “accepted” treatment technologies are not efficient for PFAS removal and a “one size fits all” treatment approach is not feasible to treat to the required regulatory limits.
Puraffinity has developed a Customised Granular Media (CGM), designed specifically to remove PFAS from water, unlike other technologies, that are applied for other treatment purposes, and are implemented also for PFAS removal, but have not been designed for it. In this respect these technologies fall short of providing a robust and reliable solution.
The material development "bottom up" approach, using advanced supramolecular chemical methods has led to a unique product exhibiting superior removal capability, faster adsorption kinetics, regenerable properties and lower operating expenditure (OPEX) compared to other adsorbent technologies. In addition this unique product development focus allows formulation of various products, depending on application and scenario requirements.
The Puraffinity team is able to conduct an in-depth analysis of each scenario and develop a dedicated treatment approach coupling advanced chemistry expertise with engineering capabilities.
Product vs Competitors
Customised Granular Media is designed to capture PFAS in water treatment
The media can be applied in a standard tank and the application designed according to the flow rate, influent contaminant concentrations and effluent requirements. In some cases, a degree of pre-treatment would be required to mitigate clogging of the filtration unit (particularly) by suspended solids.
Rapid binding kinetics enabled by a customised design approach
CGM exhibits strong binding kinetics compared to other PFAS removal technologies. Faster kinetics ensures reduced Empty Bed Contact Times (EBCTs) allowing faster flow rates or smaller vessels, thereby reducing capital costs. Fast adsorption kinetics also translates to more effective bed utilisation and a more robust process over varied operating conditions.
Adsorption Kinetics of PFHS at 50 parts per billion (ppb) - CGM versus GAC
Superior adsorption capacity
CGM demonstrates superior adsorption capacity in complex mixtures of PFAS with competing Humic Acids.
Removal of high concentration, mixed PFAS with competing Humic Acids after 500 BV – CGM versus GAC and Ion Exchange resin
Safe and on site regeneration
CGM is also capable of being regenerated using an aqueous solution, unlike competing resins which require hazardous organic solvents. Once the media is saturated, the regenerant solution can be passed through the CGM packed bed to recover more than 90% of adsorbed PFAS.