Effective PFAS degradation by electrochemical oxidation methods-recent progress and requirement

Chemosphere, Год журнала: 2023, Номер 321, С. 138109 - 138109

Опубликована: Фев. 12, 2023

Язык: Английский

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Microbial and thermal treatment techniques for degradation of PFAS in biosolids: A focus on degradation mechanisms and pathways

Journal of Hazardous Materials, Год журнала: 2023, Номер 452, С. 131212 - 131212

Опубликована: Март 15, 2023

Per- and polyfluoroalkyl substances (PFAS) are persistent organic chemicals detected in biosolids worldwide, which have become a significant concern for applications due to their increasing environmental risks. Hence, it is pivotal understand the magnitude of PFAS contamination implement effective technologies reduce prevent hazardous aftermaths. Thermal techniques such as pyrolysis, incineration gasification, biodegradation been regarded impactful solutions degrade transform into value-added products like biochar. These can mineralize compounds under specific operating parameters, lead unique degradation mechanisms pathways. Understanding pave way design technology optimize process conditions. Therefore, this review, we aim review compare thermal treatment incineration, smouldering combustion, hydrothermal liquefaction (HTL), biodegradation. For instance, perfluorooctane sulfonic acid (PFOS), firstly C-S bond cleavage occurs followed by hydroxylation, decarboxylation defluorination reactions form perfluoroheptanoic acid. In HTL, PFOS carried through OH-catalyzed series nucleophilic substitution reactions. contrast, involves three-step random-chain scission pathway. The first step includes cleavage, perfluoroalkyl radical, radical chain propagation Finally, termination produces very short-fluorinated units. We also highlighted important policies strategies employed worldwide curb biosolids.

Язык: Английский

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Migration and remediation of typical contaminants in soil and groundwater: A state of art review

Land Degradation and Development, Год журнала: 2024, Номер 35(8), С. 2700 - 2715

Опубликована: Апрель 3, 2024

Abstract Soil and groundwater contamination has always been a global concern. Contaminants are migrated transformed in the soil environments, which turn pose potential environmental risks to humans. This paper describes four typical contaminants, including heavy metals, polycyclic aromatic hydrocarbons, microplastics, perfluorinated polyfluoroalkyl substances. Based on systematic summary of sources, hazards, migration behaviors these various existing remediation methods analyzed, advantages disadvantages different discussed. Finally, future research prospects described, significance study contaminant subsurface environment is emphasized. can help provide theoretical technical support for removal further improve rate actual sites.

Язык: Английский

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PFOS destruction in a continuous supercritical water oxidation reactor

Chemical Engineering Journal, Год журнала: 2022, Номер 451, С. 139063 - 139063

Опубликована: Сен. 7, 2022

Язык: Английский

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An Integrated Approach for Determination of Total Per- and Polyfluoroalkyl Substances (PFAS)

Environmental Science & Technology, Год журнала: 2022, Номер 56(20), С. 14517 - 14527

Опубликована: Окт. 5, 2022

Per- and polyfluoroalkyl substances (PFAS) are difficult to analyze in environmental media due challenges such as extraction recovery lack of analytical standards. The total oxidizable precursor (TOP) assay suspect screening analysis coupled with semiquantitative (SQ) concentration estimates two approaches assess PFAS media, but studies needed optimize workstreams for analysis. This study applied soil methods, TOP assay, SQ three aqueous film-forming foams (AFFFs) AFFF-impacted soils. In soils, the estimated results from an method utilizing sequential acidic basic solvents led a 35% increase precursors during relative solvent only one soils tested, concentrations did not significantly remaining Furthermore, sample-specific dilution schemes were required overcome matrix effects caused by step that influenced highlight there is advantage routine application acid PFAS-impacted AFFFs, post-TOP samples identified eight classes present after oxidation. Concentrations increased, suggesting they new end points. five either remained constant or exhibited slight decreases. As result, combined may yield most representative assessment composition concentration. degrade harsh conditions. Some structurally similar PFCAs PFSAs known occur environment, degree persistence need more monitoring.

Язык: Английский

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A Critical Review on PFAS Removal from Water: Removal Mechanism and Future Challenges

Sustainability, Год журнала: 2023, Номер 15(23), С. 16173 - 16173

Опубликована: Ноя. 21, 2023

Per and polyfluoroalkyl substances (PFAS) have been extensively employed in a broad range of manufacturing consumer goods due to their highly persistent nature. PFAS exposure is recognized pose serious health hazards; therefore, addressing pollution water has become top priority for public environmental protection organizations. This review article focuses on the efficiency different removal techniques (activated carbon, biochar, ion exchange resin, membrane filtration, reverse osmosis, metal-organic frameworks, foam fractionation, ozone destruction techniques) eliminating types short- long-chain from water. Hydrophobicity electrostatic interactions are revealed be primary mechanisms elimination PFAS. The all eradicate short-chain comparatively lower compared most efficient but some drawbacks, including formation precursors high operational costs. According findings study, it anticipated that combined methods will required effectively remediate PFAS-contaminated

Язык: Английский

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Application of Hydrothermal Alkaline Treatment to Spent Granular Activated Carbon: Destruction of Adsorbed PFASs and Adsorbent Regeneration

Environmental Science & Technology Letters, Год журнала: 2023, Номер 10(5), С. 425 - 430

Опубликована: Апрель 10, 2023

Granular activated carbon (GAC) adsorption is the most common technology applied to treat water contaminated with per- and polyfluoroalkyl substances (PFASs), but rapid exhaustion of media necessitates frequent replacement costly off-site thermal regeneration. Here, we extend application hydrothermal alkaline treatment (HALT), which uses strong alkali near-critical temperatures pressures (e.g., 350 °C, 16.5 MPa, 1 M NaOH) degrade mineralize PFASs, regeneration spent GAC. Mass balance experiments wherein a known mass perfluorooctanesulfonate (PFOS) was adsorbed onto GAC prior showed that HALT achieved >99% destruction PFOS 96 ± 4% defluorination no observed fluoro-organic intermediates [167 g L–1 GAC, NaOH, trxn = 400 min, 10–15 mg (g GAC)−1]. Treatment collected from field pilot study also effective range PFASs. Moreover, repeated cycles did not significantly affect specific surface area, similar isotherms for perfluoropentanoic acid were recorded virgin HALT-treated These findings suggest promising strategy on-site PFAS-contaminated other adsorbent may be an alternative practices.

Язык: Английский

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Life cycle assessment and life cycle cost analysis of anion exchange and granular activated carbon systems for remediation of groundwater contaminated by per- and polyfluoroalkyl substances (PFASs)

Water Research, Год журнала: 2023, Номер 243, С. 120324 - 120324

Опубликована: Июль 8, 2023

Язык: Английский

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Occurrence, spatiotemporal trends, fate, and treatment technologies for microplastics and organic contaminants in biosolids: A review

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133471 - 133471

Опубликована: Янв. 11, 2024

This review provides a comprehensive overview of the occurrence, fate, treatment and multi-criteria analysis microplastics (MPs) organic contaminants (OCs) in biosolids. A meta-analysis was complementarily analysed through literature to map out occurrence fate MPs 10 different groups OCs. The data demonstrate that (54.7% rate) linear alkylbenzene sulfonate surfactants (44.2% account for highest prevalence In turn, dioxin, polychlorinated biphenyls (PCBs) phosphorus flame retardants (PFRs) have lowest rates (<0.01%). several OCs (e.g., per- polyfluoroalkyl substances, polycyclic aromatic hydrocarbons, pharmaceutical personal care products, ultraviolet filters, phosphate retardants) Europe appear at higher than Asia Americas. However, MP concentrations biosolids from Australia are reported be times America Europe, which required more measurement in-depth analysis. Amongst OC groups, brominated exhibited exceptional sorption with partitioning coefficients (log K

Язык: Английский

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Quantification of long–chain, short–chain, and ultrashort–chain liquid chromatography–amenable PFASs in water: Evaluation of approaches and tradeoffs for AFFF–impacted water

Journal of Hazardous Materials, Год журнала: 2024, Номер 466, С. 133591 - 133591

Опубликована: Янв. 22, 2024

Язык: Английский

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