Electrochemical degradation using boron-doped diamond (BDD) electrodes has been proven to be a promising technique for the treatment of water contaminated with per- and poly-fluoroalkyl substances (PFAS). Various studies have demonstrated that extent PFAS is influenced by composition samples electrochemical conditions. This study evaluated significance several factors, such as current density, initial concentration PFAS, electrolyte, time, their interactions on PFAS. A 24 factorial design...

The contamination of natural water and industrial wastewater with per- polyfluoroalkyl substances (PFAS) occurs globally. Thus, proper technologies are required to reduce PFAS in the environment mitigate adverse effects these pollutants on human health environment. This study used a 23 full factorial design evaluate importance operating factors including level persulfate (PS), initial concentration PFAS, time photochemical degradation via ultraviolet irradiation at 185/254 nm assisted (PS/UV...

Per- and polyfluoroalkyl substances (PFAS) are stable organic chemicals, which have been used globally since the 1940s caused PFAS contamination around world. This study explores perfluorooctanoic acid (PFOA) enrichment destruction by a combined method of sorption/desorption photocatalytic reduction. A novel biosorbent (PG-PB) was developed from raw pine bark grafting amine groups quaternary ammonium onto surface particles. The results PFOA adsorption at low concentration suggest that PG-PB...

Electrochemical and ultraviolet-based methods are advanced oxidation processes emerging as viable water wastewater treatment options. In this study, a combination of these two (EO-UV) using boron-doped diamond (BDD) electrodes ultraviolet radiation at both 185 254 nm was assessed for the degradation poly-fluoroalkyl substances (PFAS). Sodium persulfate (Na2S2O8) sodium sulfate (Na2SO4) were used electrolytes. The method investigated on model solutions containing perfluorooctanoic acid (PFOA)...

Addition of iron oxide to arsenic-contaminated soil has been proposed as a means reducing the mobility arsenic in soil. Arsenic and zinc are common coexisting contaminants soils. The presence therefore may affect adsorption properties on oxide, thus its influence Zn(II) arsenate ions was studied. Batch experiments indicated that increased removal from solution by ferrihydrite at pH 8. However, ATR-FTIR spectroscopy showed no film occurred pD 8 Zn(II). Precipitation hydroxide carbonate...

This study aimed at elucidating the long-term efficiency of soil remediation where chemical stabilization arsenic (As) contaminated using zerovalent iron (Fe) amendments was applied. A combination extraction and extended X-Ray absorption fine structure (EXAFS) spectroscopy technique applied on soils collected from five laboratory field experiments in Sweden France. All were treated with 1 wt% Fe grit 2–15 years prior to sampling. The results indicate that all studied soils, despite elapsed...

This study aimed at combining iron and peat to produce a sorbent suitable for simultaneous removal of cations anions from solution. Peat powder, an industrial residue, was coated with by immersing into salt solutions. The adsorption efficiency the newly produced towards As, Cr, Cu Zn tested means batch experiments constant pH value 5. Coating Fe on significantly increased As (from <5% 80%) Cr <3% 25%) in comparison uncoated peat. Removal slightly decreased (by 10–15%), yet remained within...

Abstract Improper management of wood impregnation chemicals and treated has led to soil contamination at many treatment sites, particularly with toxic substances like creosote oil chromated copper arsenate (CCA). The simultaneous presence these pollutants complicates the choice remediation technologies, especially if they are be applied in situ. In this laboratory study, we attempted immobilise arsenic (As) simultaneously degrade polycyclic aromatic hydrocarbons (PAHs) (constituents oil) by...

The current study evaluated a three-stage treatment to remediate PFAS-contaminated soil. consisted of soil washing, foam fractionation (FF), and electrochemical oxidation (EO). possibility replacing the third stage, i.e., EO, with an adsorption process was also assessed. contamination in studied soils dominated by perfluorooctane sulfonate (PFOS), concentration 760 19 μg kg−1 I II, accounting for 97 % 70 all detected per-and polyfluoroalkyl substances (PFAS). Before applying pilot soil,...

Sorption fixed-bed column experiments were performed using a titanium phosphate ion-exchanger composed of −H2PO4 units [TiO(OH)(H2PO4)·H2O]. Model mine water containing five divalent metal ions (Cu2+, Zn2+, Mn2+, Ni2+, and Co2+) few closed-mine samples treated to evaluate the sorption preference material. For first time, dynamic ion-exchange capacities (estimated be between 3.2 4.2 mequiv g–1) static uptakes (calculated 3.1 3.5 obtained for same TiP1 sorbent data discussed in terms behavior....

Although landfilling is environmentally and economically unsustainable, it the dominant soil remediation method in EU member states. This paper describes part of a study on mixed contaminants that investigated stabilisation arsenic (As) contaminated an outdoor box experiment with electrokinetic treatment (EK). The was conducted two 1 m

Some of the older Swedish roads contain road tar underneath a surface layer bituminous asphalt. This tar, also known as asphalt, contains large amounts polycyclic aromatic hydrocarbons (PAHs). There is concern about PAHs spreading from bottom layers these to surrounding environment, and that because this asphalt should not be recycled but rather placed in landfills. However, risk assessment PAH below has yet been conducted. The first aim study was assess potential underlying sand beneath,...

Hydrothermal carbonisation (HTC) is a wet and relatively low-temperature process where, under autogenous pressures, biomass undergoes chain of reactions leading to the defragmentation organic matter. As well as its other uses (e.g. for producing low-cost carbon-based nano-compounds), HTC utilised treatment wastes, such manure biosludge. This study aimed determine if hydrothermal feasible method spent sorbents that are highly enriched with arsenic, chromium, copper, zinc. The chemical...

An in situ method for spreading iron amendments to arsenic (As)-contaminated soil has been investigated the laboratory and field. This study tested distribution of Fe from corroding electrodes through using a low-voltage direct current setting validated field As immobilisation contaminated soil. Laboratory tests revealed that corrosion occurred way similar during electrocoagulation water, which decreased concentrations flow-through water 150 μg L−1 undetectable levels. Method validation over...