Effect of thermal pre-treatment on the availability of PAHs for successive chemical oxidation in contaminated soils

Usman, Muhammad; Chaudhary, Akshay; Biache, Coralie; Faure, Pierre; Hanna, Khalil

doi:10.1007/s11356-015-5369-7

Cited by 41 publications

(28 citation statements)

References 43 publications

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“…Subsequently, different oxidation treatments were applied to 2 g of decarbonated soil, as summarized in Table 3, by comparing and combining ferrate(VI) and conventional oxidants. On the other hand, to evaluate the impact of PCB availability, different procedures were opted (Table 3) which have already shown positive impacts in previous studies on pollutant availability for ultimately a better remediation [5,30]. For this purpose, soil was subjected to different pretreatments including the use of complexing agent, the methyl-β-cyclodextrin, and the exposition of the soil to 40°C.…”

Section: Oxidation Experimentsmentioning

confidence: 99%

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Monfort

Usman

Soutrel

et al. 2019

Chemical Engineering Journal

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Ferrate (Fe(VI)) has emerged as an efficient oxidant to treat organic pollutants in aqueous solution. However, its application has never been assessed to remediate the contaminated soils. Here, we report the first study to use Fe(VI) for chemical oxidation of PCBs in historically contaminated soils obtained from an industrial wasteland. The first part of this study explores the efficiency of ferrate(VI) to degrade PCBs under various experimental conditions (liquid/solid ratio, oxidant dose, temperature and reaction time). Integrated application of Fe(VI) with conventional oxidants (hydrogen peroxide H 2 O 2 , persulfate S 2 O 8 2and peroxymonosulfate HSO 5-) was also tested. Conventional oxidants resulted in only 2-2 12% PCB degradation while Fe(VI) removed 30% of PCBs. Integrated use of Fe(VI) and conventional oxidants improved the degradation efficiency which was the highest (40% removal) by Fe(VI)/HSO 5-. This could be attributed to two-step degradation proceeding firstly by electron transfer with Fe(VI) followed by radical attack of conventional oxidants. To evaluate if PCB degradation is limited by soil factors, role of carbonate content, overall soil matrix, and PCB availability were assessed as a second part of this study. Negative role of soil matrix was highly prominent for conventional oxidants than Fe(VI). An increase in PCB availability improved the treatment efficiency (45% removal by Fe(VI) alone) highlighting the role of soil factors. All these results indicate the higher suitability and efficiency of Fe(VI) as compared to the conventional oxidants for soil remediation. Since use of Fe(VI) is innovative for both soil remediation and PCB oxidation, degradation mechanisms are also proposed.

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Section: Oxidation Experimentsmentioning

confidence: 99%

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Monfort

Usman

Soutrel

et al. 2019

Chemical Engineering Journal

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“…PAHs are rarely degraded through Fenton-like oxidation due to their low bioavailability in soils [34]. In the hydrochloric acid-Fenton system, the addition of K2C2O4 notably enhanced the The degradation efficiency (r, mg/g) of the citric-Fenton system at different time phases was calculated as follows:…”

Section: The Degradation Rate Of Bound Pah Residues Under Different Amentioning

confidence: 99%

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

et al. 2019

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The availability of bound residues of polycyclic aromatic hydrocarbons (PAHs), in reference to their parent compounds, can be enhanced by microbial activity and chemical reactions, which pose severe risks for the ecosystems encompassing contaminated soils. Considerable attention has been raised on how to remove these bound residues from PAH-contaminated soils. This paper provides a novel application of Fenton oxidation in the removal of bound residues of model PAHs, such as naphthalene (NAP), acenaphthene (ACP), fluorene (FLU) and anthracene (ANT), from naturally contaminated soils. The citric acid-enhanced Fenton treatment resulted in the degradation of bound PAH residues that followed pseudo-first-order kinetics, with rate constants within 4.22 × 10−2, 1.25 × 10−1 and 2.72 × 10−1 h−1 for NAP, FLU, and ANT, respectively. The reactivity of bound PAH residues showed a correlation with their ionization potential (IP) values. Moreover, the degradation rate of bound PAH residues was significantly correlated with H2O2-Fe2+ ratio (m/m) and H2O2 concentrations. The highest removal efficiencies of bound PAH residues was up to 89.5% with the treatment of chelating agent oxalic acid, which was demonstrated to be superior to other acids, such as citric acid and hydrochloric acid. This study provides valuable insight into the feasibility of citric acid-Fenton and oxalic acid-Fenton treatments in rehabilitating bound PAH residues in contaminated soils.

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“…Although these studies gave new information on chemical oxidation processes and the key role of the contaminant chemoavailability (toward the chemical agent), the field application of solvent extraction to enhance the chemical treatment efficiency seems difficult to implement. Another more practical technique improving the chemo-availability of organic contaminants consists in heating the contaminated matrices at moderate temperatures (60-150 °C) [30].This technique was applied on the same aged coking plant soil and has proven to be capable to enhance the oxidation efficiency (Fenton-like) for PAH contaminated soils presenting low PAH availability [31,32].…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-heating on the chemical oxidation efficiency: Implications for the PAH availability measurement in contaminated soils

Biache

Lorgeoux

Andriatsihoarana

et al. 2015

Journal of Hazardous Materials

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Three chemical oxidation treatments (KMnO4, H2O2 and Fenton-like) were applied on three PAH-contaminated soils presenting different properties to determine the potential use of these treatments to evaluate the available PAH fraction. In order to increase the available fraction, a pre-heating (100 °C under N2 for one week) was also applied on the samples prior oxidant addition. PAH and extractable organic matter contents were determined before and after treatment applications. KMnO4 was efficient to degrade PAHs in all the soil samples and the pre-heating slightly improved its efficiency. H2O2 and Fenton-like treatments presented low efficiency to degrade PAH in the soil presenting poor PAH availability, however, the PAH degradation rates were improved with the pre-heating. Consequently H2O2-based treatments (including Fenton-like) are highly sensitive to contaminant availability and seem to be valid methods to estimate the available PAH fraction in contaminated soils.

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Effect of thermal pre-treatment on the availability of PAHs for successive chemical oxidation in contaminated soils

Cited by 41 publications

References 43 publications

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Removal of Bound PAH Residues in Contaminated Soils by Fenton Oxidation

Effect of pre-heating on the chemical oxidation efficiency: Implications for the PAH availability measurement in contaminated soils

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