Influence of continuous phase evolution of non-aqueous phase liquid on the retention and transport of coexistence perfluorooctanoic acid in saturated porous media

Wang，Peng1,2; Yan，Zheng1,2; Lin，Xiang1,2; Yang，Bingrui1,2; Zhang，Wen2; Wu，Dongsheng1; Guo，Zhilin3; Pu，Shengyan1,2

2024-06-01

10.1016/j.jhydrol.2024.131321

Journal of Hydrology   影响因子和分区

0022-1694

Non-aqueous phase liquid (NAPL) undergoing continuous evolution presents challenges in predicting the migration of co-contaminants within saturated porous media. This study explores the impact of the ongoing evolution of dimethyl phthalate (DMP-NAPL) on retention and transport of coexisting perfluorooctanoic acid (PFOA). The presence of PFOA facilitates the dispersion of free-phase DMP by mobilization and enhances the migration flux of solution phase through dissolution of both free and residual phase. The retardation of PFOA migration initially increases and then decrease as the evolution process continues. The retardation factor (R) demonstrates a negatively correlation with free-phase saturation (r = −0.987, p < 0.05), but a positively with residual-phase saturation (r = 0.948, p < 0.05). The primary factors controlling PFOA migration are its adsorption on the NAPL-water interface (f = 0 ∼ 58.51%) and on solid surface (f = 41.18 ∼ 100%). The contribution of partitioning to overall retention (f) remains consistently below 2%, indicating limited partitioning into bulk DMP-NAPL. Dissolved DMP exhibits a slight retardation effect on low-concentration PFOA migration because of competitive adsorption. This study elucidates the migration characteristics of PFOA throughout the complete dynamic evolution of NAPL, providing valuable insights into contaminant transport in a multi-phase contaminated groundwater environment.

Continuous phase evolution Free- and residual-phase Migration retardation Non-aqueous phase liquid Perfluorooctanoic acid

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85193201886

Scopus

1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,610059,China
2.State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution,College of Ecology and Environment,Chengdu University of Technology,Chengdu,610059,China
3.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Peng,Yan，Zheng,Lin，Xiang,et al. Influence of continuous phase evolution of non-aqueous phase liquid on the retention and transport of coexistence perfluorooctanoic acid in saturated porous media[J]. Journal of Hydrology,2024,636.

Wang，Peng.,Yan，Zheng.,Lin，Xiang.,Yang，Bingrui.,Zhang，Wen.,...&Pu，Shengyan.(2024).Influence of continuous phase evolution of non-aqueous phase liquid on the retention and transport of coexistence perfluorooctanoic acid in saturated porous media.Journal of Hydrology,636.

Wang，Peng,et al."Influence of continuous phase evolution of non-aqueous phase liquid on the retention and transport of coexistence perfluorooctanoic acid in saturated porous media".Journal of Hydrology 636(2024).