DOI: 10.1016/j.watres.2018.10.035
Scopus记录号: 2-s2.0-85055026062
论文题名: Comprehensive retention model for PFAS transport in subsurface systems
作者: Brusseau M.L. ; Yan N. ; Van Glubt S. ; Wang Y. ; Chen W. ; Lyu Y. ; Dungan B. ; Carroll K.C. ; Holguin F.O.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 148 起始页码: 41
结束页码: 50
语种: 英语
英文关键词: Air-water interfacial adsorption
; PFAS
; PFOA
; PFOS
; Retardation
Scopus关键词: Adsorption
; Air
; Paraffins
; Phase interfaces
; Porous materials
; Sand
; Soils
; Interfacial adsorption
; PFAS
; PFOA
; PFOS
; Retardation
; Transport properties
; decane
; perfluorooctanesulfonic acid
; silicon dioxide
; water
; air-water interaction
; breakthrough curve
; estimation method
; experimental study
; numerical model
; polymer
; porous medium
; sand
; soil pollution
; subsurface flow
; adsorption
; air
; Article
; bulk density
; chemical structure
; compartment model
; controlled study
; liquid
; sand
; soil
; solid
; surface tension
; water content
; water supply
英文摘要: A comprehensive compartment model is presented for PFAS retention that incorporates all potential processes relevant for transport in source zones. Miscible-displacement experiments were conducted to investigate separately the impact of adsorption at the air-water and decane-water interfaces on PFAS retention and transport. Two porous media were used, a quartz sand and a soil, and perfluorooctanesulfonic acid (PFOS) was used as the model PFAS. The breakthrough curves for transport under water-unsaturated conditions were shifted noticeably rightward (delayed arrival) compared to the breakthrough curves for saturated conditions, indicating greater retardation due to adsorption at the air-water or decane-water interface. The retardation factor was 7 for PFOS transport in the sand for the air-water system, compared to 1.8 for saturated conditions. PFOS retardation factors for transport in the soil were 7.3 and 3.6 for unsaturated (air-water) vs saturated conditions. Air-water interfacial adsorption is a significant source of retention for PFOS in these two systems, contributing more than 80% of total retention for the sand and 32% for the soil. For the experiments conducted with decane residual emplaced within the sand, adsorption at the decane-water interface contributed more than 70% to total retention for PFOS transport. Methods to determine or estimate key distribution variables are presented for parameterization of the model. Predicted retardation factors were similar to the measured values, indicating that the conceptual model provided adequate representation of the relevant retention processes and that the parameter estimation methods produced reasonable values. The results of this work indicate that adsorption by fluid-fluid interfaces in variably saturated porous media can be a significant retention process for PFAS that should be considered when characterizing their transport and fate behavior in source zones. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122229
Appears in Collections: 气候变化事实与影响
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作者单位: Soil, Water, and Environmental Science Department, University of Arizona, Tucson, AZ 85721, United States; Hydrology and Atmospheric Sciences Department, University of Arizona, Tucson, AZ 85721, United States; Institute of Water Resources and Environment, Jilin University, Changchun, 130026, China; Department of Plant & Environmental Sciences, New Mexico State University, Las Cruces, NM, United States
Recommended Citation:
Brusseau M.L.,Yan N.,Van Glubt S.,et al. Comprehensive retention model for PFAS transport in subsurface systems[J]. Water Research,2019-01-01,148