In order to meet the current demand for PFOS/PFAS treatment, H&T has collaborated with experts to develop treatment options, including Granular Activated Carbon and Ion Exchange. Depending on the raw water chemistry and competing constituents in the raw water, each of these treatment options may offer advantages in terms of effectiveness and efficiency over the other.

The System Design

In both GAC and Selective Ion Exchange Resin Processes, rather than a single vessel design, the typical system configuration is a “Lead-Lag” piping arrangement that allows for:

  • Longer runtime and higher efficiency
  • 25-50-75% bed depth sample taps for analysis of the Mass Transfer Zone
  • Stainless Steel underdrain construction that follows the bottom contour of the vessel to reduce overall height
  • Easy media replacement via center bottom head sluice connection

The GAC & Ion Exchange PFAS removal process is a “once through” system, meaning the media is used until exhaustion and then replaced.

In order to reduce cost and improve efficiency it is paramount that the entire media bed participates in the adsorption process.

Conical bottom designs have poor flow distribution profiles and inherent hide out zones that impact performance.

H&T’s “Dropdown Strainer” design utilizes maximum vessel volume for 100% media utilization.

H&T has a long history as a respected contributor to the water treatment “think tank” in developing water treatment methodology. If you have further questions regarding PFOA/PFOS removal, please call (856) 881-3200 or use our contact form.