Holland, Dave

Dave has 41 years of experience with water and wastewater treatment, including low- and high-pressure membranes. He's on the board for the AMTA and is a member of AWWA and the AIChE. Dave has an associate degree in technical writing and is currently completing a bachelors degree in chemical engineering.

Titles from this speaker

Description: Novel Approach to PFAS Removal Using a Highly Adsorbent Material and a Robust...

Novel Approach to PFAS Removal Using a Highly Adsorbent Material and a Robust Separator Minimizes Sorbent Usage and Waste Production

Abstract

Multiple studies were conducted to compare a new sorbent material with granular activated carbon (GAC), recording per- and polyfluoroalkyl substances (PFAS) adsorption rates and spent media volumes. The sorbent is maintained in a slurry and recirculated through a separator, which retains and concentrates the sorbent but allows clean water to pass through. Once the slurry reaches a target concentration, it is disposed and the system is filled with a new batch of sorbent. The studies revealed that PFAS adsorption rates were as much as 500 times higher than those of GAC when treating various matrices such as high-PFAS surface water and high- and low-salinity groundwater. In addition, the sorbent material was much more effective in removing smaller-chain PFAS compounds compared to GAC. Unlike other adsorption technologies, the adsorption/separation (ASP) technology features automated sorbent replacement on timed intervals to optimize performance by minimizing potential co-contamination and scaling effects. This paper reviews the elevated PFAS removal, reduced sorbent demand, and optimized replacement approach that result in significantly less operation and maintenance (O&M) costs than a GAC system.

This presentation describes how a unique sorbent has demonstrated specific adsorption rates for per- and polyfluoroalkyl substances (PFAS) that are up to 500 times higher than those achieved by granular activated carbon. The increased effective surface area and smaller diameter permit greater access to internal micro- and mesopores, thereby enhancing both long and short-chained PFAS removal. The process employs a separator made from a high-hardness material, allowing it to generate a highly-concentrated sorbent suspension without abrasion to the separator surface. This novel technology features automated sorbent replacement on timed intervals to optimize performance by minimizing potential co-contamination and scaling effects.

SpeakerHolland, Dave

Presentation time

16:05:00

16:25:00

Session time

16:00:00

17:30:00

SessionNot Forever Chemicals! We Can Get Rid of PFAS

Session number119

TopicMicroconstituents

Author(s)

Dave Holland