- Title
- Dynamic Column Studies of Multicomponent PFAS Sequestration Facilitated by Four Contrasting Injectable Adsorbent Suspensions and Associated PFAS Release in Simulated Groundwater
- Creator
- Umeh, Anthony C.; Naidu, Ravi
- Relation
- ACS ES and T Water Vol. 4, Issue 6, p. 2320-2765
- Publisher Link
- http://dx.doi.org/10.1021/acsestwater.4c00159
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2024
- Description
- There is limited information on the effectiveness of injectable adsorbent suspensions (IASs) for in situ sequestration of per- and polyfluoroalkyl substance (PFAS)-contaminated groundwater, especially regarding potential PFAS release in the presence of coexisting anions. In this study, four IASs were injected into water-saturated sand columns. The IAS mobility and retention and the sequestration of 3 perfluoroalkyl sulfonates and 6 perfluoroalkyl carboxylic acids (PFCAs) and their release were investigated, following two designs. The IAS retention (95%) was evaluated by using organic carbon measurements and scanning electron microscopy. The anion exchange resin (A-IXR) IAS facilitated the largest (76 to 99% or 239-291 mg) PFAS sequestration, with the extent of short chain PFAS sequestration affected by competitive effects. Total PFAS released ranged from 11 to 54%, with the A-IXR columns also exhibiting the largest (44% to 52%) release of short chain PFAS (especially PFCA) in simulated groundwater, as influenced by anion exchange. Mass balance of PFAS ranged from 18 to 129%, with the longer chain PFAS showing the lowest recoveries, indicating their stronger sequestration. Overall, a complete picture regarding the effectiveness of IAS for in situ PFAS sequestration must consider the potential release of previously sequestered PFAS, given the influence of the variable groundwater chemistry.
- Subject
- dynamic flowthrrough experiments; short and long chain PFAS mixtures; anion exchange; competition; groundwater; ionic chemistry; SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1506508
- Identifier
- uon:55886
- Identifier
- ISSN:2690-0637
- Language
- eng
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