TY - JOUR
T1 - Adaptation of selected models for describing competitive per- and polyfluoroalkyl substances breakthrough curves in groundwater treated by granular activated carbon
AU - Croll, Henry C.
AU - Chow, Steven
AU - Ojeda, Nadezda
AU - Schwab, Kellogg
AU - Prasse, Carsten
AU - Capelle, Ryan
AU - Klamerus, Jamie
AU - Oppenheimer, Joan
AU - Jacangelo, Joseph G.
N1 - Funding Information:
This project was funded by the City of Cottage Grove, Minnesota Pollution Control Agency, and Minnesota Department of Natural Resources. The authors thank Cottage Grove Staff with their assistance with pilot set-up and operations, particularly Ryan Burfeind, Rick Alt, and Rich Moer. The authors also thank Gary Krueger of the Minnesota Pollution Control Agency and Lucas Martin of the Minnesota Department of Health for their helpful comments throughout the study. Eric Bruce and Geno Lehman of Stantec are acknowledged for their advice on pilot design and operation.
Publisher Copyright:
© 2022
PY - 2022/7/5
Y1 - 2022/7/5
N2 - Granular activated carbon (GAC) has proven to be a successful technology for per- and polyfluoroalkyl substances (PFAS) removal from contaminated drinking water supplies. Proper design of GAC treatment relies upon characterization of media service-life, which can change significantly depending on the PFAS contamination, treatment media, and water quality, and is often determined by fitting descriptive models to breakthrough curves. However, while common descriptive breakthrough models are favored for their ease-of-use, they have a significant shortcoming in that they are not able to properly fit PFAS desorption in competitive sorption scenarios. The present work adapts three common descriptive models to fit competitive PFAS breakthrough curves from a GAC pilot study. The adapted and original models were fit to the experimental breakthrough curves for 12 common PFAS and evaluated using adjusted R2 and reduced χ2 values. This study found that the novel adaptation of the common descriptive models successfully accounted for desorption of PFAS compounds from the GAC, accurately describing increased exposure risks due to elevated effluent levels during desorption without significantly increasing the complexity of implementing the models.
AB - Granular activated carbon (GAC) has proven to be a successful technology for per- and polyfluoroalkyl substances (PFAS) removal from contaminated drinking water supplies. Proper design of GAC treatment relies upon characterization of media service-life, which can change significantly depending on the PFAS contamination, treatment media, and water quality, and is often determined by fitting descriptive models to breakthrough curves. However, while common descriptive breakthrough models are favored for their ease-of-use, they have a significant shortcoming in that they are not able to properly fit PFAS desorption in competitive sorption scenarios. The present work adapts three common descriptive models to fit competitive PFAS breakthrough curves from a GAC pilot study. The adapted and original models were fit to the experimental breakthrough curves for 12 common PFAS and evaluated using adjusted R2 and reduced χ2 values. This study found that the novel adaptation of the common descriptive models successfully accounted for desorption of PFAS compounds from the GAC, accurately describing increased exposure risks due to elevated effluent levels during desorption without significantly increasing the complexity of implementing the models.
KW - Adsorption
KW - Breakthrough modeling
KW - Drinking water
KW - Per- and polyfluoroalkyl substances (PFAS)
KW - Water treatment
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U2 - 10.1016/j.jhazmat.2022.128804
DO - 10.1016/j.jhazmat.2022.128804
M3 - Article
C2 - 35366450
AN - SCOPUS:85127174012
SN - 0304-3894
VL - 433
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 128804
ER -