Removal of poly- and perfluoroalkyl substances (PFAS) from water by adsorption: Role of PFAS chain length, effect of organic matter and challenges in adsorbent regeneration

Gagliano, Erica; Sgroi, Massimiliano; Falciglia, Pietro P.; Vagliasindi, Federico G.A.; Roccaro, Paolo

doi:10.1016/j.watres.2019.115381

Cited by 540 publications

(402 citation statements)

References 85 publications

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“…Plant and substrate disposal, however, remains a great challenge. Thus, thermal treatment could be required for the complete mineralization of adsorbed and bioaccumulated PFAS (Gagliano et al, 2020). Microorganisms are the most important component of the wetland; however, the indigenous microbes have limited ability to biodegrade PFAS.…”

Section: Future Prospects and Conclusionmentioning

confidence: 99%

Challenges and Current Status of the Biological Treatment of PFAS-Contaminated Soils

Shahsavari

Rouch

Khudur

et al. 2021

Front. Bioeng. Biotechnol.

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Per- and polyfluoroalkyl substances (PFAS) are Synthetic Organic Compounds (SOCs) which are of current concern as they are linked to a myriad of adverse health effects in mammals. They can be found in drinking water, rivers, groundwater, wastewater, household dust, and soils. In this review, the current challenge and status of bioremediation of PFAs in soils was examined. While several technologies to remove PFAS from soil have been developed, including adsorption, filtration, thermal treatment, chemical oxidation/reduction and soil washing, these methods are expensive, impractical for in situ treatment, use high pressures and temperatures, with most resulting in toxic waste. Biodegradation has the potential to form the basis of a cost-effective, large scale in situ remediation strategy for PFAS removal from soils. Both fungal and bacterial strains have been isolated that are capable of degrading PFAS; however, to date, information regarding the mechanisms of degradation of PFAS is limited. Through the application of new technologies in microbial ecology, such as stable isotope probing, metagenomics, transcriptomics, and metabolomics there is the potential to examine and identify the biodegradation of PFAS, a process which will underpin the development of any robust PFAS bioremediation technology.

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Section: Future Prospects and Conclusionmentioning

confidence: 99%

Challenges and Current Status of the Biological Treatment of PFAS-Contaminated Soils

Shahsavari

Rouch

Khudur

et al. 2021

Front. Bioeng. Biotechnol.

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“…Some natural organic matter (NOM) molecules, such as humic and fulvic acids commonly found in drinking water sources, contain anionic groups at drinking water pHs and thus can compete for sites on ion-exchange resin (Bolto et al, 2004;Levchuk et al, 2018). These species can reduce the effectiveness of PFAS sorption by competing for sites on the ion-exchange resin (Gagliano et al, 2019). Competition due to NOM is difficult to model because important properties like molecular weight, valence, and selectivity of NOM are usually ill defined, and this challenge is accentuated by the extremely heterogeneous nature across the NOM spectrum.…”

Section: Effects Of Natural Organic Mattermentioning

confidence: 99%

Avoiding pitfalls when modeling removal of per‐ and polyfluoroalkyl substances by anion exchange

et al. 2021

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Per-and polyfluoroalkyl substances (PFAS) are receiving a great deal of attention from regulators, water utilities, and the general public. Anionexchange resins have shown high capacities for removal of these substances from water, but there is currently a paucity of ion-exchange treatment models available to evaluate performance. In this work, important theoretical and practical considerations are discussed for modeling PFAS removal from drinking water using gel-type, strong-base anion-exchange resin in batch and column processes. Several important limitations found in the literature preclude movement toward model development, including the use of inappropriate isotherms, inappropriate kinetic assumptions, and experimental conditions that are not relevant to drinking water conditions. Theoretical considerations based on ion-exchange fundamentals are presented that will be of assistance to future researchers in developing models, designing batch and column experiments, and interpreting results of batch and column experiments.

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“…There are many spent magnetic nanoadsorbent regeneration methods among which the chemical method appears to be popular (Meng et al 2018 ; Campos et al 2019 ; Gagliano et al 2020 ; Sahoo et al 2020 ; Bakhshi Nejad and Mohammadi 2020 ; Biata et al 2020 ; Jain et al 2021 ; Peralta et al 2021 ). Other adsorbent regeneration methods are thermal (Aguedal et al 2019 ), supercritical extraction (Momina et al 2018 ), microbial regeneration (Momina et al 2018 ), solvent extraction (Dutta et al 2019 ), and microwave and ultraviolet irradiation (Sun et al 2017 ).…”

Section: Developments With Magnetic Nanoadsorbents and Magnetic Separationmentioning

confidence: 99%

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

Mudhoo

Sillanpää

2021

Environ Chem Lett

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Pure water will become a golden resource in the context of the rising pollution, climate change and the recycling economy, calling for advanced purification methods such as the use of nanostructured adsorbents. However, coming up with an ideal nanoadsorbent for micropollutant removal is a real challenge because nanoadsorbents, which demonstrate very good performances at laboratory scale, do not necessarily have suitable properties in in full-scale water purification and wastewater treatment systems. Here, magnetic nanoadsorbents appear promising because they can be easily separated from the slurry phase into a denser sludge phase by applying a magnetic field. Yet, there are only few examples of large-scale use of magnetic adsorbents for water purification and wastewater treatment. Here, we review magnetic nanoadsorbents for the removal of micropollutants, and we explain the integration of magnetic separation in the existing treatment plants. We found that the use of magnetic nanoadsorbents is an effective option in water treatment, but lacks maturity in full-scale water treatment facilities. The concentrations of magnetic nanoadsorbents in final effluents can be controlled by using magnetic separation, thus minimizing the ecotoxicicological impact. Academia and the water industry should better collaborate to integrate magnetic separation in full-scale water purification and wastewater treatment plants.

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Removal of poly- and perfluoroalkyl substances (PFAS) from water by adsorption: Role of PFAS chain length, effect of organic matter and challenges in adsorbent regeneration

Cited by 540 publications

References 85 publications

Challenges and Current Status of the Biological Treatment of PFAS-Contaminated Soils

Challenges and Current Status of the Biological Treatment of PFAS-Contaminated Soils

Avoiding pitfalls when modeling removal of per‐ and polyfluoroalkyl substances by anion exchange

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

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