Fate of iron and polycyclic aromatic hydrocarbons during the remediation of a contaminated soil using iron-activated persulfate: A column study

Pardo, Fernándo López; Santos, Aurora; Salvador, Alfredo

doi:10.1016/j.scitotenv.2016.04.197

Cited by 61 publications

(25 citation statements)

References 61 publications

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“…It is noted that natural degradation of anthracene to 9,10‐anthraquinone was obtained during the aging period. This had also been observed in previous work with the same soil …”

Section: Methodssupporting

confidence: 90%

“…With regard to results obtained in the C‐ISCO run, it was found that after 25 days of treatment, a significant amount of pollutants was still present in the soil (35% of TPH and about 40% of phenanthrene). C‐ISCO run results can be compared with those obtained in previous work using the same soil employed here yet spiked with approximately 100 mg kg ‐1 of PHE, PYR, ANT and BaP . The same flow rate, PS inlet concentration (210 mmol L ‐1 ) and treatment time (25 days) used here were employed, but, in that case, iron was used as activator (like Fe(III) or nZVI).…”

Section: Resultsmentioning

confidence: 97%

“…The value of

k_{dn}^{'}

at the same W/V L ratio used here but without the addition of alkali was estimated in previous work at 5.16×10 ‐5 h ‐1 . .…”

Section: Resultsmentioning

confidence: 99%

“…The soil selected for this study was a sandy clay loam Bt horizon from the Autonomous Community of Madrid. Property values such as pH = 7.22, total organic carbon = 0.196% and labile iron = 7235 mg kg −1 , dp < 2 mm and hydraulic conductivity = 14.1 cm day −1 , were characterized in previous work , . The spiking procedure was developed according to the literature , , .…”

Section: Methodsmentioning

confidence: 99%

“…For comparison with results obtained elsewhere using persulfate activated by iron the initial persulfate concentration was fixed at 210 mmol L ‐1 . The initial molar ratio NaOH:PS was set at 4 to ensure a higher production of hydroxyl radicals and maintenance of pH above 12 .…”

Section: Methodsmentioning

confidence: 99%

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Remediation of soil contaminated by PAHs and TPH using alkaline activated persulfate enhanced by surfactant addition at flow conditions

Lominchar

Lorenzo

Salvador

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Remediation of a soil polluted with fuel oil #2 and polycyclic aromatic hydrocarbons (PAHs) has been carried out by alkaline activated persulfate (PS). The effect of surfactant addition on the abatement of TPH and PAHs was studied. Accordingly, four runs were performed at flow conditions using: only water, only surfactant (15 g L‐1 of Verusol‐3), activated persulfate (210 mmol L‐1 PS and 840 mmol L‐1 NaOH) and surfactant (15 g L‐1 Verusol) with activated persulfate (210 mmol L‐1 PS and 840 mmol L‐1 NaOH). RESULTS Washing with water was found to achieve negligible desorption of the pollutants. Washing with surfactant or a combination of surfactant and oxidant completely removed the contaminants from soil, however only the addition of oxidant yielded an aqueous effluent without pollutants. When adding activated persulfate alone (without surfactant), about 30% residual contamination remained in the soil. CONCLUSION Results suggest that the combined application of surfactant and alkali persulfate produces a significant improvement in the elimination of organic compounds such as fuel oil #2 and PAHs. © 2017 Society of Chemical Industry

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“…It is noted that natural degradation of anthracene to 9,10‐anthraquinone was obtained during the aging period. This had also been observed in previous work with the same soil …”

Section: Methodssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 97%

“…The value of