Short-chain PFAS Treatment Costs: Experiences in PFAS Cost of Treatment
Brunswick County Northwest Water Treatment Plant Membrane Advanced Treatment Upgrades for Per- and Polyfluoroalkyls
A case study on the discovery of PFAS (Per- and Polyfluoroalkyl Substances) in the Cape Fear River source water of Brunswick County’s Northwest Water Treatment Plant and the evaluation of advanced treatment options for the expanded 36 mgd surface water facility. Details of the Low Pressure Reverse Osmosis Membrane Pilot Study will be provided as […]
Brunswick County’s LPRO NPDES Permitting Process
In 2017, Brunswick County government and it’s citizens were surprised to find high levels of PFAS in their drinking water. The public utility participated in piloting multiple removal technologies and settled on LPRO as the best technology to protect its citizens and stop the spread of PFAS across the county. As the utility and the […]
Tar Heels and Polyamide Reels: LPRO Piloting in the Old North State
This presentation will summarize three case studies of piloting low-pressure reverse osmosis (LPRO) for the removal of emerging contaminants, such as per- and polyfluoroalkyl substances (PFAS) and 1,4-dioxane. The speaker will profile the three subject communities, the intended goals for the individual pilots, the design and scope of these pilots, and operations/challenges encountered during the […]
A Pilot Study to Evaluate PFAS Removal from Filtered Water
This presentation will review the removal of per- and polyfluoroalkyl substances (PFAS) from surface water using nanofiltration (NF). A 20-gpm NF pilot has been in operation since October 2021 to evaluate treatment performance and operational challenges. To date, we have evaluated PFAS removal at two recoveries: 80% and 85%. In the near future we will […]
Tutorial: Reverse Osmosis Membrane Technologies for Purifying Water
Today’s membranes for reverse osmosis are primarily thin film composite constructions or porous asymmetric films that are rolled into modules for incorporation into water purification plants. The composite membranes are comprised of non-porous thin surface layers coated onto porous mechanical polymeric supports that are all mounted on a fabric backing. They efficiently transport water under […]
Design Criteria and Operating Conditions Have Sizeable Impacts on Trace Organic Removal by Reverse Osmosis for Potable Reuse
This presentation describes the results of mathematical modeling that demonstrates the extent to which reverse osmosis design criteria and operating conditions affect the removal of trace organics in potable reuse applications. Reverse osmosis is used in advanced treatment facilities to remove a wide variety of organic compounds, and achieving high removal is important for protecting […]
Rethinking Membrane Plant Operations
The City of Bozeman WTP has had membranes in service for 8 years. Over the course of the last 8 years plant operators have been working to optimize and improve operations to be more efficient and sustainable. Operators have taken initiative to optimize coagulant dosages, membrane cleaning, minimize chemical usage for residuals treatment, and reduce […]
Managing and Treating PFAS in Membrane Concentrates
Per- and polyfluoroalkyl substances (PFAS) have detrimental impacts on human health and the environment. Reverse osmosis (RO) and nanofiltration (NF) have shown excellent PFAS separation performance in water treatment; however, these membrane systems do not destroy PFAS but produce concentrated residual streams that need to be managed. Complete destruction of PFAS in RO and NF […]
Emerging Membrane Strategies to “Unstick” PFAS from WRFs
This presentation will explore the environmental fate and transport of PFAS compounds and examine multiple pre-treatment strategies at WRF’s to mitigate their infiltration into our water sources. In addition, implementation of several potential MBR treatment trains at WRF’s will be discussed as an effort to reduce PFAS discharges from treated effluent. Finally, several disposal methods […]
