Efficient removal of perfluorooctane sulfonate from aqueous film-forming foam solution by aeration-foam collection

Meng, Pingping; Deng, Shubo; Maimaiti, Ayiguli; Wang, Bin; Huang, Jun; Wang, Yujue; Cousins, Ian T.; Yu, Gang

doi:10.1016/j.chemosphere.2018.03.183

Cited by 60 publications

(63 citation statements)

References 45 publications

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“…For the batch experiments, the foamate to feed water ratio averaged 21% as shown in Table S6 and is similar to the 22% value reported by Robey et al (2020), however the average enrichment factor of 2.9 for all PFAS analyzed was less than the 3.7 estimated from Robey et al (2020) and significantly less than the factor of 8400 for PFOS reported by Meng et al (2018) who used a non‐ionic hydrocarbon surfactant to enhance removal. Similarly, this work's 21% is less than the enrichment factor of 45 up to 1300 reported by Ebersbach et al (2016) for 6:2 FTSA enrichment in aerosols which may be attributed to the higher PFAS concentrations and greater ionic strength of the wastewater.…”

Section: Resultssupporting

confidence: 83%

“…As summarized in Table 3, the average removal was 83% for all PFAS which is comparable to the 81% removal reported by Dai et al (2019), while removal efficiency for PFSA was greater than for PFCA, 94% versus 77%, respectively, which also agrees with Dai et al (2019). PFOS removal efficiency was greater than 98% and PFOA 99% which is similar to the 99% for PFOS removal reported by Meng et al (2018) PFOA, PFHxS, PFOS, and 6:2 FTSA made up approximately 80% of the total PFAS in the untreated leachate (Table S1) at the site.…”

Section: Overall Pfas Removal Efficiency Chain-length and Air-water Partitioning Coefficientsupporting

confidence: 81%

See 1 more Smart Citation

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

McCleaf¹,

Kjellgren

Ahrens

2021

AWWA Water Science

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Per-and polyfluoroalkyl substances (PFAS) are a common contaminant in municipal landfill leachate and are recognized as a pollutant on global scale.The present work examined foam fractionation (FF) in batch and continuous modes as an appropriate treatment technique for PFAS removal for the landfill leachate and found stable removal efficiency of greater than 90% for PFOA (C 7 ), PFOS (C 8 ), PFHxS (C 6 ), and PFHpA (C 6 ) and 6:2 FTSA (C 6 ). For other PFAS such as PFNA (C 8 ), PFPeS (C 4 ), PFHxA (C 5 ), PFHpS (C 7 ), and PFBS (C 4 ), a less stable removal between 80% and 50% was achieved while between 50% and 20% removal was observed for EtFOSAA (C 8 ), PFBA (C 3 ), PFDA (C 9 ), FOSA (C 8 ), PFPeA (C 4 ), and MeFOSAA (C 8 ). Increased air flowrate, addition of iron (III) oxide (Fe +3 ) coagulant, conductivity, and greater untreated leachate PFAS concentration were factors resulting in increased removal efficiency for the majority of PFAS.

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Section: Resultssupporting

confidence: 83%

Section: Overall Pfas Removal Efficiency Chain-length and Air-water Partitioning Coefficientsupporting

confidence: 81%

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

McCleaf¹,

Kjellgren

Ahrens

2021

AWWA Water Science

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“…Ozonated air fractionation has showed higher PFAS removal than air alone (Dai et al, 2019), and foam fractionation has also been combined with ultraviolet (UV) photodegradation to concentrate and destroy PFOS (Lyu et al, 2020). Meng et al (2018) found that higher ionic strength (up to 5 mM NaCl) slightly enhanced PFAS separation efficiency in aeration-foam collection, which suggests that the elevated salt content expected in PFAS-laden concentrate streams could be conducive to aeration-foam collection.…”

Section: Foam Fractionationmentioning

confidence: 99%

Managing and treating per‐ and polyfluoroalkyl substances (PFAS) in membrane concentrates

et al. 2021

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Per-and polyfluoroalkyl substances (PFAS), which are present in many waters, have detrimental impacts on human health and the environment. Reverse osmosis (RO) and nanofiltration (NF) have shown excellent PFAS separation performance in water treatment; however, these membrane systems do not destroy PFAS but produce concentrated residual streams that need to be managed. Complete destruction of PFAS in RO and NF concentrate streams is ideal, but long-term sequestration strategies are also employed. Because no single technology is adequate for all situations, a range of processes are reviewed here that hold promise as components of treatment schemes for PFAS-laden membrane system concentrates. Attention is also given to relevant

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“…OBS can be decomposed under UV and UV/H 2 O 2 , but will produce complex by-products raising concern about its potential toxicity [13]. Aeration-foam collection is effective for OBS removal from water to the μg l −1 level; however, further treatment is also needed [16]. Wastewater treatment plants are unable to remove OBS from wastewater [17].…”

Section: Introductionmentioning

confidence: 99%

“…Because of a serious concern regarding its further spread in aqueous environment and consequent risk to biological and human health, it is very important to study the environmental transport, environmental fate and removal of OBS from water and wastewater using effective techniques. To the best of our knowledge, there are only two papers discussing OBS removal from water using an oxidation method and aeration-foam collection [13,16]. OBS can be decomposed under UV and UV/H 2 O 2 , but will produce complex by-products raising concern about its potential toxicity [13].…”

Section: Introductionmentioning

confidence: 99%

Adsorption behaviour and mechanism of the PFOS substitute OBS (sodium p -perfluorous nonenoxybenzene sulfonate) on activated carbon

Wang

Shi

et al. 2019

R. Soc. open sci.

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Perfluorooctane sulfonate (PFOS) was listed as a persistent organic pollutant by the Stockholm Convention. As a typical alternative to PFOS, sodium p -perfluorous nonenoxybenzene sulfonate (OBS) has recently been detected in the aquatic environment which has caused great concern. For the first time, the adsorption behaviour and mechanism of OBS on activated carbon (AC) with different physical and chemical properties were investigated. Decreasing the particle size of AC can accelerate its adsorption for OBS, while AC with too small particle size was not conducive to its adsorption capacity due to the destruction of its pore structure during the mechanical crushing process. Intra-particle diffusion had a lesser effect on the adsorption rate of AC with smaller particle size, higher hydrophilicity and larger pore size. Reactivation of AC by KOH can greatly enlarge their pore size and surface area, greatly increasing their adsorption capacities. The adsorption capacity of two kinds of R-GAC exceeded 0.35 mmol g −1 , significantly higher than that of other ACs. However, increasing the hydrophilicity of AC would decrease their adsorption capacities. Further investigation indicated that a larger pore size and smaller particle size can greatly enhance the adsorptive removal of OBS on AC in systems with other coexisting PFASs and organic matter due to the reduction of the pore-blocking effect. The spent AC can be successfully regenerated by methanol, and it can be partly regenerated by hot water and NaOH solution. The percentage of regeneration for the spent AC was 70.4% with 90°C water temperature and up to 95% when 5% NaOH was added into the regeneration solution. These findings are very important for developing efficient adsorbents for the removal of these newly emerging PFASs from wastewater and understanding their interfacial behaviour.

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Efficient removal of perfluorooctane sulfonate from aqueous film-forming foam solution by aeration-foam collection

Cited by 60 publications

References 45 publications

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

Foam fractionation removal of multiple per‐ and polyfluoroalkyl substances from landfill leachate

Managing and treating per‐ and polyfluoroalkyl substances (PFAS) in membrane concentrates

Adsorption behaviour and mechanism of the PFOS substitute OBS (sodium p -perfluorous nonenoxybenzene sulfonate) on activated carbon

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