Congratulations to Jessica Alanis, Poonam R. Kulkarni, PE, Nicholas W. Johnson, PhD, PE, Hassan Javed, PhD, Victoria Ng, and Charles J. Newell, PhD, PE, BCEE, and their co-authors (Alexandra Farnell, John...
Congratulations to Jessica Alanis, Poonam R. Kulkarni, PE, Nicholas W. Johnson, PhD, PE, Hassan Javed, PhD, Victoria Ng, and Charles J. Newell, PhD, PE, BCEE, and their co-authors (Alexandra Farnell, John A. Connor) on the publication “Use of Colloidal Gas Aphrons to Remove Per- and Polyfluoroalkyl Substances from Reverse Osmosis Concentrate” in Environmental Engineering Science.
The GSI team co-authored the article with the Los Angeles County Sanitation Districts (LACSD) (Eric D. Nelson, Bruce Mansell, Patricia Hsia, Mojtaba Farrokh Shad), and the University of Houston (Zanina Ilieva, and Hanadi S. Rifai).
The study evaluates colloidal gas aphrons (CGAs) as a treatment approach for removing PFAS from highly saline reverse osmosis concentrate. The researchers examined treatment performance under different operating conditions, and the results demonstrated removal of up to 97% of long-chain PFAS mass and 75% of short-chain PFAS.
The findings provide additional insight into the potential use of CGAs for managing PFAS concentrates through reverse osmosis treatment.
Read the article: https://journals.sagepub.com/doi/abs/10.1177/15579018261488656
Congratulations to all the authors!
California wineries are facing common compliance challenges under the Statewide General WDR, from monitoring requirements and water softener brine separation to pond...
California wineries are facing common compliance challenges under the Statewide General WDR, from monitoring requirements and water softener brine separation to pond standards and compliance schedules.
In the new North Bay Business Journal article, “Navigating California’s Waste Discharge Requirements for Wineries,” Mehran Ebrahimi, PE, and co-author Donald Sobelman of Farella Braun + Martel take a closer look at these challenges and share practical considerations for wineries working toward compliance.
Read the article: https://www.pressdemocrat.com/2026/09/11/navigating-californias-waste-discharge-requirements-for-wineries/
GSI’s Hassan Javed and Graham K. Ansell, together with co-authors Frank Adamsky, Marco Malvasi, Paige K. Mulvaney, Pier Antonio Guarda, Robert H....
GSI’s Hassan Javed and Graham K. Ansell, together with co-authors Frank Adamsky, Marco Malvasi, Paige K. Mulvaney, Pier Antonio Guarda, Robert H. Moffett, Simone Genna, Steve Johnston and Xian Liang, have published a study titled “A Critical Review of the Application of Polymer of Low Concern and Regulatory Criteria to Perfluoropolyethers” in Journal of Fluorine Chemistry.
The paper examines perfluoropolyethers (PFPEs), a class of polymeric PFAS widely used as lubricants in aerospace, healthcare, automotive, and other sectors, and evaluates them against Polymers of Low Concern (PLC) criteria. The study finds that PFPEs, owing to their high stability, negligible bioaccumulation, and distinct physicochemical characteristics, pose minimal risk to human health and the environment. The authors emphasize that PFPEs should be evaluated as a separate class for regulatory purposes, distinct from non-polymeric PFAS.
Read the full article about regulatory criteria to perfluoropolyethers here: https://www.sciencedirect.com/science/article/abs/pii/S0022113925000715